Data transmission method and device

Abstract

The present application discloses a data transmission method and device, which can improve the accuracy of data transmission. The method includes: receiving an indication information for indicating quasi-co-location information of a control channel or a data channel, and the quasi-co-location information indicates that the control channel or the data channel has a quasi-co-location relationship with multiple reference signals. Doppler frequency deviation estimation is performed based on the quasi-co-location information between the multiple reference signals to obtain a comprehensive Doppler frequency deviation estimation result, and the control channel or the data channel from multiple network devices is demodulated based on the comprehensive Doppler frequency deviation estimation result. By associating the quasi-co-location information with multiple reference signals, that is, the data channel or the control channel has a quasi-co-location relationship with the multiple reference signals, the terminal device can estimate more accurate channel information and Doppler frequency deviation based on the multiple reference signals in the presence of multipath signals, thereby improving the accuracy of channel estimation.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a data transmission method and device. Background Art

[0002] At present, there are three main networking modes for wireless coverage technology: single frequency network (SFN), dual frequency network and multi-frequency network. Among them, the single frequency network can achieve signal coverage within a certain range at the same time and using the same frequency, reducing the number of user equipment (UE) switching. In long-term evolution (LTE), single-frequency networking can be connected to a base band unit (BBU) through multiple remote radio heads (RRH)-s. The multiple RRH-s use the same cell ID. All RRHs connected to a BBU jointly send data to a UE, and the UE will simultaneously receive common reference signals (cell-specific reference signal, CRS) reference signals from multiple RRHs. When the number of RRH transmitting antenna ports is determined, the corresponding CRS resources are fixed.

[0003] In LTE, all RRHs connected to a BBU jointly send data to a UE, and the UE will receive the same CRS from multiple RRHs at the same time. In some high-speed mobile scenarios, such as on high-speed trains and trains, when the UE uses CRS for Doppler spectrum estimation, since the CRSs sent by all RRH-s connected to a BBU occupy the same fixed-position time-frequency resources, these CRSs sent by the RRHs will form multipath signals when they reach the UE, resulting in Doppler expansion problems, causing the UE downlink synchronization to be unable to determine the center frequency well, thereby reducing the accuracy of received data. Summary of the invention

[0004] The present application provides a data transmission method and device, a chip, a computer-readable storage medium, a computer program product, etc., which can improve the accuracy of data transmission.

[0005] In a first aspect, an embodiment of the present application provides a data transmission method, which can be applied to a terminal device, or a chip or chipset in a terminal device, and the method includes: receiving an indication information, wherein the indication information is used to indicate quasi-co-location information of a control channel or a data channel, wherein the quasi-co-location information indicates that the control channel or the data channel has a quasi-co-location relationship with multiple reference signals. Receive control channels or data channels from multiple network devices. Perform Doppler frequency offset estimation based on the quasi-co-location information between the multiple reference signals to obtain a comprehensive Doppler frequency offset estimation result, and demodulate the control channel or the data channel based on the comprehensive Doppler frequency offset estimation result.

[0006] In an embodiment of the present application, quasi-co-site information is associated with multiple reference signals, that is, the data channel (or control channel) and the multiple reference signals are in a quasi-co-site relationship, so that the terminal device can estimate more accurate channel information and Doppler frequency deviation based on the multiple reference signals in the presence of multipath signals, thereby improving the accuracy of channel estimation, such as the accuracy of the channel estimation time domain difference, etc., to improve the reception performance.

[0007] In one possible design, when performing Doppler frequency offset estimation based on the quasi-co-site information between the multiple reference signals, Doppler frequency offset estimation can be performed on the multiple reference signals respectively based on the quasi-co-site information to obtain Doppler frequency offset estimation results corresponding to the multiple reference signals respectively; and the Doppler frequency offset estimation results corresponding to the multiple reference signals are combined to obtain the comprehensive Doppler frequency offset estimation result.

[0008] In the above design, by combining the Doppler frequency offset estimation results of multiple reference signals, a relatively accurate comprehensive Doppler frequency offset estimation result can be obtained, thereby improving the accuracy of channel estimation.

[0009] In one possible design, the indication information may include configuration information indicating the quasi-co-location information, the configuration information includes a reference signal list, and the reference signal list includes identifiers of the multiple reference signals. In the above design, the identifiers of multiple reference signals may be carried in the reference signal list of the configuration information, so that a data channel (or control channel) has a quasi-co-location relationship with the multiple reference signals.

[0010] In one possible design, the indication information includes a plurality of configuration information indicating the quasi co-location information, wherein the plurality of configuration information is associated one-to-one with the plurality of reference signals. In the above design, by including a plurality of configuration information associated with different reference signals and indicating the same quasi co-location information in the indication information, a quasi co-location relationship exists between the data channel (or control channel) and the plurality of reference signals.

[0011] In a possible design, the multiple reference signals may include at least one of the following: a tracking reference signal (CSI-RS for tracking, TRS), a synchronization signal broadcast channel block (synchronisation signal / PBCHblock, SSB).

[0012] In a second aspect, an embodiment of the present application provides a data transmission method, which can be applied to a network device, or a chip or chipset in a network device, and the method includes: sending an indication information, wherein the indication information is used to indicate quasi-co-location information of a control channel or a data channel, wherein the quasi-co-location information indicates that multiple reference signals of the control channel or the data channel have a quasi-co-location relationship; and sending a control channel or a data channel to a terminal device according to the quasi-co-location information.

[0013] In an embodiment of the present application, quasi-co-site information is associated with multiple reference signals, that is, the data channel (or control channel) and the multiple reference signals are in a quasi-co-site relationship, so that the terminal device can estimate more accurate channel information and Doppler frequency deviation based on the multiple reference signals in the presence of multipath signals, thereby improving the accuracy of channel estimation, such as the accuracy of the channel estimation time domain difference, etc., to improve the reception performance.

[0014] In one possible design, the configuration information of the quasi-co-location information includes a reference signal list, and the reference signal list includes identifiers of the multiple reference signals. In the above design, the identifiers of multiple reference signals can be carried in the reference signal list of the configuration information, so that the data channel (or control channel) has a quasi-co-location relationship with the multiple reference signals.

[0015] In one possible design, the indication information includes a plurality of configuration information indicating the quasi co-location information, wherein the plurality of configuration information is associated one-to-one with the plurality of reference signals. In the above design, by including a plurality of configuration information associated with different reference signals and indicating the same quasi co-location information in the indication information, a quasi co-location relationship exists between the data channel (or control channel) and the plurality of reference signals.

[0016] In one possible design, the multiple reference signals may include at least one of the following: TRS, SSB.

[0017] In the third aspect, an embodiment of the present application provides a data transmission method, which can be applied to a terminal device, or a chip or chipset in a terminal device, and the method includes: receiving first information, wherein the first information is used to activate a TCI state, and the TCI state is associated with a TRS resource. Receive a TRS from a first radio remote head RRH, wherein the first RRH is an RRH currently providing services among multiple RRHs connected to the same baseband processing unit BBU, and the TRS is the TRS corresponding to the TRS resource. Based on the TRS, perform at least one of the following: channel estimation, Doppler frequency offset estimation. In the above second embodiment, the terminal device only needs to track one TCI state at a time, that is, only one set of TCI states is activated for the terminal device, which can reduce the complexity of implementation.

[0018] In one possible design, second information is received from the first RRH, where the second information is used to indicate switching from the first RRH to the second RRH; and switching from the first RRH to the second RRH.

[0019] In a possible design, before receiving the second information from the first RRH, it also includes: performing signal quality measurements on the reference signals sent by the multiple RRHs respectively to obtain measurement values ​​corresponding to the multiple RRHs respectively; and reporting the measurement values ​​corresponding to the multiple RRHs respectively to the first RRH.

[0020] In a possible design, before switching from the first RRH to the second RRH, it also includes: receiving data from the first RRH based on a result obtained by performing at least one of the following based on the TRS: channel estimation and Doppler frequency offset estimation.

[0021] In a fourth aspect, an embodiment of the present application provides a data transmission method, which can be applied to a terminal device, or a chip or chipset in the terminal device, and the method includes: receiving first information, the first information being used to activate a first TCI state and a second TCI state; receiving a first TRS from a first RRH and a second TRS from a second RRH, the first RRH being an RRH currently providing services among multiple RRHs connected to the same baseband processing unit BBU, the first TRS being a TRS corresponding to the first TCI state, and the second TRS being a TRS corresponding to the second TCI state; performing at least one of the following based on the first TRS: channel estimation, Doppler frequency offset estimation, or, performing at least one of the following based on the second TRS after switching from the first RRH to the second RRH: channel estimation, Doppler frequency offset estimation.

[0022] In an embodiment of the present application, the data channel and the control channel may use the same TCI state or different TCI states. If the data channel and the control channel use the same TCI state, the TCI state of the new switch of the control channel may be indicated by MAC-CE, and the TCI state may be applicable to the data channel and the control channel. In this implementation, two sets of TRS associated with different TCI states may be configured. If the data channel and the control channel use different TCIstates, the TCI state of the control channel may remain unchanged, and the TCI state of the data channel may be dynamically indicated by DCI according to the specific RRH providing the service.

[0023] Furthermore, the terminal device can obtain accurate Doppler frequency deviation information according to different TCI states within different coverage ranges, thereby avoiding the Doppler expansion problem caused by multipath, and then can estimate and correct the Doppler frequency deviation more accurately, so that the UE can lock the beam for transmitting and receiving data more accurately during high-speed movement, thereby improving the receiving performance. Furthermore, in the above-mentioned embodiment three, the terminal device simultaneously tracks two or more sets of TCI states, so that when the terminal device switches the TCI state, it can save the time of activating the new TCI state, thereby avoiding the interruption of data transmission to a certain extent.

[0024] In one possible design, before switching from the first RRH to the second RRH, the method further includes: receiving second information from the first RRH, where the second information is used to indicate switching from the first RRH to the second RRH.

[0025] In a possible design, before receiving the second information from the first RRH, it also includes: performing signal quality measurements on the reference signals sent by the multiple RRHs respectively to obtain measurement values ​​corresponding to the multiple RRHs respectively; and reporting the measurement values ​​corresponding to the multiple RRHs respectively to the first RRH.

[0026] In one possible design, after performing at least one of the following based on the first TRS: channel estimation, Doppler frequency offset estimation, it also includes: receiving data from the first RRH according to a result obtained by performing at least one of the following based on the first TRS: channel estimation, Doppler frequency offset estimation.

[0027] In one possible design, after performing at least one of the following based on the second TRS: channel estimation, Doppler frequency offset estimation, it also includes: receiving data from the second RRH according to a result obtained by performing at least one of the following based on the second TRS: channel estimation, Doppler frequency offset estimation.

[0028] In a fifth aspect, the present application provides a data transmission device, which may be a communication device or a chip or chipset in a communication device, wherein the communication device may be a terminal device or a network device. The device may include a processing module and a transceiver module. When the device is a communication device, the processing module may be a processor, and the transceiver module may be a transceiver; the device may also include a storage module, and the storage module may be a memory; the storage module is used to store instructions, and the processing module executes the instructions stored in the storage module so that the terminal device performs the corresponding functions in the first aspect, the third aspect, or the fourth aspect, or the processing module executes the instructions stored in the storage module so that the network device performs the corresponding functions in the second aspect. When the device is a chip or chipset in a communication device, the processing module may be a processor or a processing circuit, and the transceiver module may be an input / output interface, a pin, or a circuit, etc.; the processing module executes the instructions stored in the storage module so that the terminal device performs the corresponding functions in the first aspect, the third aspect, or the fourth aspect, or the processing module executes the instructions stored in the storage module so that the network device performs the corresponding functions in the second aspect. The storage module may be a storage module within the chip or chipset (eg, a register, a cache, etc.), or a storage module within the base station that is located outside the chip or chipset (eg, a read-only memory, a random access memory, etc.).

[0029] In a sixth aspect, a data transmission device is provided, comprising: a processor, a communication interface, and a memory. The communication interface is used to transmit information, and / or messages, and / or data between the device and other devices. The memory is used to store computer-executable instructions. When the device is running, the processor executes the computer-executable instructions stored in the memory to enable the device to perform the method described in the first aspect or any design of the first aspect, the second aspect or any design of the second aspect, the third aspect or any design of the third aspect, and the fourth aspect or any design of the fourth aspect.

[0030] In the seventh aspect, an embodiment of the present application provides a computer storage medium, which stores program instructions. When the program instructions are executed on a communication device, the communication device executes the method of the first aspect and any possible design thereof, the second aspect and any possible design thereof, the third aspect or any design thereof, the fourth aspect or any design thereof, of the embodiment of the present application.

[0031] In an eighth aspect, a computer program product provided in an embodiment of the present application, when the computer program product runs on a communication device, enables the communication device to implement the method of the first aspect of the embodiment of the present application and any possible design thereof, the second aspect and any possible design thereof, the third aspect or any design in the third aspect, the fourth aspect or any design in the fourth aspect.

[0032] In the ninth aspect, an embodiment of the present application provides a chip, which is coupled to a memory and executes the method of the first aspect of the embodiment of the present application and any possible design thereof, the second aspect and any possible design thereof, the third aspect or any design of the third aspect, and the fourth aspect or any design of the fourth aspect.

[0033] In the tenth aspect, an embodiment of the present application provides a chip, comprising a communication interface and at least one processor, wherein the communication interface is used to output and / or input signals, or to receive computer program codes or instructions and transmit them to the processor, and the processor runs the computer program code to execute the method described in the first aspect of the embodiment of the present application or any design in the first aspect, the second aspect and any possible design thereof.

[0034] It should be noted that, in the embodiments of the present application, “coupling” refers to two components being directly or indirectly coupled to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of data transmission in a SFN network provided in an embodiment of the present application;

[0037] Figure 3 A flowchart of a data transmission method provided in an embodiment of the present application;

[0038] Figure 4 A schematic diagram of a data transmission process provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of another data transmission process provided in an embodiment of the present application;

[0040] Figure 6 A schematic diagram of another data transmission process provided in an embodiment of the present application;

[0041] Figure 7 A schematic diagram of another data transmission process provided in an embodiment of the present application;

[0042] Figure 8 A schematic diagram of the architecture of a data transmission device provided in an embodiment of the present application;

[0043] Fig. 9 A schematic diagram of the architecture of a data transmission device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] To facilitate understanding of the embodiments of the present application, the following terms related to the embodiments of the present application are introduced:

[0045] 1. Quasi co-location (QCL):

[0046] Quasi co-location can also be called quasi co-station or co-location.

[0047] The signals corresponding to the antenna ports having a QCL relationship may have the same or similar spatial characteristic parameters (or called parameters), or the spatial characteristic parameters (or called parameters) of one antenna port may be used to determine the spatial characteristic parameters (or called parameters) of another antenna port having a QCL relationship with the antenna port, or the two antenna ports have the same or similar spatial characteristic parameters (or called parameters), or the difference in the spatial characteristic parameters (or called parameters) between the two antenna ports is less than a certain threshold.

[0048] It should be understood that the spatial characteristic parameters of two reference signals or channels that satisfy the QCL relationship are the same (or close, or similar), so that the spatial characteristic parameters of the target reference signal can be inferred based on the source reference signal resource index.

[0049] It should also be understood that the spatial characteristic parameters of two reference signals or channels that satisfy the spatial correlation information are the same (or close, or similar), so that the spatial characteristic parameters of the target reference signal can be inferred based on the source reference signal resource index.

[0050] The spatial characteristic parameters include one or more of the following parameters:

[0051] Angle of arrival (angle of arrival, AoA), dominant angle of incidence AoA, average angle of incidence, power angular spectrum of incidence (power angular spectrum, PAS), angle of departure (angle of departure, AoD), dominant departure angle, average departure angle, power angular spectrum of departure angle, terminal device transmit beamforming, terminal device receive beamforming, spatial channel correlation, network device transmit beamforming, network device receive beamforming, average channel gain, average channel delay, delay spread, Doppler spread, Doppler shift, spatial Rx parameters, etc.

[0052] The above angles may be decomposition values ​​of different dimensions, or a combination of decomposition values ​​of different dimensions.

[0053] The existing standards define four types of QCL. Network equipment can configure one or more types of QCL for terminal equipment at the same time, such as QCL type A+D, C+D:

[0054] QCL type A: Doppler shift, Doppler spread, average delay, delay spread

[0055] QCL type B: Doppler shift, Doppler spread

[0056] QCL type C: Doppler shift, average delay

[0057] QCL type D:Spatial Rx parameter

[0058] It should be understood that the above four types of QCLs can also be named as other names, such as QCL type A can also be called typeA, QCL-type A, Type A, etc. Other types of QCLs are similar and are not specifically limited here. For the convenience of description, QCL type A is collectively referred to as type A, QCL type B is collectively referred to as type B, QCL type C is collectively referred to as type C, and QCL type D is collectively referred to as type D.

[0059] When the QCL relationship is a type D QCL relationship, it can be considered as spatial QCL. When the antenna port satisfies the spatial QCL relationship, it can be a QCL relationship (also called spatial relation) between the port of the downlink signal and the port of the downlink signal, or between the port of the uplink signal and the port of the uplink signal, and the two signals can have the same AoA or AoD, which is used to indicate that they have the same receive beam or transmit beam. For another example, for the QCL relationship between the downlink signal and the uplink signal or between the ports of the uplink signal and the downlink signal, the AoA and AoD of the two signals can have a corresponding relationship, or the AoD and AoA of the two signals can have a corresponding relationship, that is, the beam reciprocity can be used to determine the uplink transmit beam according to the downlink receive beam, or the downlink receive beam can be determined according to the uplink transmit beam.

[0060] The signals transmitted on the ports having the spatial QCL relationship can also be understood as receiving or sending signals using the same spatial filter. The spatial filter can be at least one of the following: precoding, antenna port weight, antenna port phase deflection, antenna port amplitude gain.

[0061] The signal transmitted on the port with a spatial QCL relationship can also be understood as having a corresponding beam pair link (BPL), and the corresponding BPL includes at least one of the following: the same downlink BPL, the same uplink BPL, an uplink BPL corresponding to the downlink BPL, and a downlink BPL corresponding to the uplink BPL.

[0062] Therefore, the spatial reception parameter (ie, QCL of type D) may be understood as a parameter for indicating the direction information of the reception beam.

[0063] In the examples of the present application, the correspondence between certain parameters can also be applied to the scenarios described by QCL.

[0064] It should be understood that the scenario applicable to the QCL assumption in the present application may also be two reference signals, or further may be an association relationship between transmission objects.

[0065] 2. Transmission configuration indication (TCI) status:

[0066] TCI is used to indicate the QCL information of a signal or channel. The channel may be a physical downlink control channel (PDCCH) / control resource set (CORESET) or a physical downlink shared channel (PDSCH). The signal may be a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), TRS, a synchronization signal broadcast channel block (synchronisation signal / PBCH block, SS / PBCH block), etc. TCI information refers to the reference signal included in the TCI and the channel or signal satisfying the QCL relationship, and is mainly used to indicate that when a signal or channel is received, its spatial characteristic parameters and other information are the same, similar or close to the spatial characteristic parameters and other information of the reference signal included in the TCI.

[0067] A TCI state can configure one or more referenced reference signals and the associated QCL type. The QCL type can be divided into four categories: A / B / C / D, which are different combinations or selections of {Doppler shift, Doppler spread, average delay, delay spread, spatial Rx parameter}. The TCI state includes QCL information, or the TCI state is used to indicate QCL information.

[0068] The configuration information of TCI state can be as follows:

[0069]

[0070]

[0071] Among them, qcl-Type1 is the first QCL information, qcl-Type2 is the second QCL information, QCL-Info is the specific content corresponding to qcl-Type, among which referenceSignal is the reference signal that satisfies the QCL relationship, and qcl-Type is the specific QCL type, such as typeA, typeB, typeC, typeD, etc.

[0072] 3. SS / PBCH block:

[0073] SS / PBCH block can also be called SSB. PBCH is the abbreviation of physical broadcast channel. SSB contains at least one of primary synchronization signal (PSS), secondary synchronization signal (SSS) and PBCH. It is mainly used for cell search, cell synchronization, and signals that carry broadcast information.

[0074] It should be noted that with the continuous development of technology, the terms of the embodiments of the present application may change, but they are all within the scope of protection of the present application.

[0075] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0076] The data transmission method provided in the present application can be applied to various communication systems, for example, it can be the Internet of Things (IoT), narrowband Internet of Things (NB-IoT), LTE, or the fifth generation (5G) communication system, or a hybrid architecture of LTE and 5G, or a 5G NR system, and new communication systems that will emerge in the future development of communication. The 5G communication system described in the present application may include at least one of a non-standalone (NSA) 5G communication system and a standalone (SA) 5G communication system. The communication system may also be a public land mobile network (PLMN) network, a device-to-device (D2D) network, a machine-to-machine (M2M) network, or other networks.

[0077] Figure 1A communication system 100 applicable to an embodiment of the present application is shown. The communication system 100 may include a network device 110, a network device 120 and a terminal device 130. The above communication system applicable to the embodiment of the present application is only an example, and the communication system applicable to the embodiment of the present application is not limited thereto. For example, the number of network devices and terminal devices included in the communication system may also be other numbers, or a single base station, multi-carrier aggregation scenario, a dual connection scenario or a D2D communication scenario, a coordinated multi-point (CoMP) scenario may be adopted. Among them, CoMP may be one or more scenarios of non coherent joint transmission (NCJT), coherent joint transmission (CJT), joint transmission (JT), etc.

[0078] The terminal device involved in the embodiments of the present application is an entity on the user side for receiving or transmitting signals. The terminal device may be a device that provides voice and data connectivity to users, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device may also be other processing devices connected to a wireless modem. The terminal device may communicate with one or more core networks through a radio access network (RAN). The terminal device may also be referred to as a wireless terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a mobile station, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, a user device, or a user equipment, etc. The terminal device may be a mobile terminal, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal, for example, a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device, which exchanges language and data with a wireless access network. For example, the terminal device may also be a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and other devices. Common terminal devices include, for example, mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MIDs), wearable devices, such as smart watches, smart bracelets, pedometers, etc., but the embodiments of the present application are not limited thereto. The terminal devices involved in the embodiments of the present application may also be terminal devices that appear in the future evolved PLMN, etc., and the embodiments of the present application are not limited thereto.

[0079] In addition, in the embodiment of the present application, the terminal device can also be a terminal device in an IoT system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection. In the embodiment of the present application, IoT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrow band (NB) technology.

[0080] In addition, in an embodiment of the present application, the terminal device may also include sensors such as smart printers, train detectors, and gas stations. Its main functions include collecting data (partial terminal devices), receiving control information and downlink data from network devices, and sending electromagnetic waves to transmit uplink data to network devices.

[0081] The network device involved in the embodiment of the present application is an entity on the network side for transmitting or receiving signals. The network device in the embodiment of the present application may be a device in a wireless network, such as a RAN node that accesses a terminal to a wireless network. For example, the network device may be an evolutionary Node B (eNB or e-NodeB) in LTE, or a new radio controller (NR controller), a gNode B (gNB) in a 5G system, a centralized unit (CU), a new wireless base station, a radio frequency remote module, a micro base station, a relay, a distributed unit (DU), a home base station, a transmission reception point (TRP) or a transmission point (TP) or any other wireless access device, but the embodiment of the present application is not limited thereto. The network device may cover one or more cells.

[0082] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0083] At present, there are three main networking modes for wireless coverage technology: SFN, dual-frequency network and multi-frequency network. Among them, single-frequency network can achieve signal coverage within a certain range at the same time and using the same frequency, reducing the number of UE switching. In LTE, single-frequency networking can be connected to a BBU through multiple RRH-s. The multiple RRH-s use the same cell ID, and all RRHs connected to a BBU jointly send data to a UE.

[0084] In LTE, all RRHs connected to a BBU jointly send data to a UE, and the UE will receive reference signals from multiple RRHs at the same time, and perform channel estimation and time-frequency tracking based on the reference signals of the multiple RRHs. LTE uses CRS as the downlink reference signal, and CRS is at the cell level, that is, all UEs in a cell receive the same CRS for channel estimation and time-frequency tracking. Therefore, in LTE, all RRHs connected to a BBU jointly send data to a UE, and the UE will receive the same reference signal from multiple RRHs at the same time. In some high-speed mobile scenarios, such as high-speed trains and trains, when the UE uses CRS for Doppler spectrum estimation, since the CRSs sent by all RRH-s connected to a BBU occupy the same fixed-position time-frequency resources, the CRSs sent by these RRHs will form multipath signals when they reach the UE, resulting in a Doppler spread problem, causing the UE downlink synchronization to be unable to determine the center frequency well, thereby reducing the accuracy of the received data. For example, Figure 2 As shown, the terminal device is on the high-speed railway. Four RRHs are deployed along the high-speed railway, namely RRH0~RRH3. RRH0~RRH3 are connected to the same BBU. RRH0~RRH3 jointly send data to the UE. Since the CRS sent by RRH0~RRH3 occupies the same fixed-position time-frequency resources, the CRS sent by RRH0~RRH3 to the UE forms a four-path signal, resulting in a Doppler expansion problem.

[0085] In addition, CRS occupies time-frequency resources at fixed positions, which will cause a certain degree of waste of time-frequency resources.

[0086] Based on this, the embodiments of the present application provide a data transmission method and device, which can improve the accuracy of UE receiving data in a fast moving scenario. The method and the device are based on the same inventive concept. Since the method and the device solve the problem in a similar way, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0087] In the embodiment of the present application, data may refer to a codeword, a transport block, a code block, a code block group, etc.

[0088] It should be understood that in the embodiments of the present application, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can represent: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c can be single or multiple.

[0089] In addition, it should be understood that in the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order, nor do they represent number.

[0090] The method provided in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0091] Example 1: See Figure 3 , is a flowchart of a data transmission method provided by the present application, which can be applied to a communication system of SFN networking, in which multiple network devices can use the same frequency to jointly send data to a terminal device. In an exemplary description, the multiple network devices can be RRHs, and the multiple network devices are connected to the same BBU.

[0092] The method can be applied to a communication device, a chip, or a chipset, etc. The following takes a communication device as an example for explanation, and the method includes:

[0093] S301, multiple network devices send an indication message to a terminal device, the indication message is used to indicate QCL information of a control channel or a data channel, and the QCL information indicates that the control channel or the data channel has a quasi-co-location relationship with multiple reference signals. Correspondingly, the terminal device receives the indication message. Exemplarily, the indication message may be a TCI state. For the convenience of description, the indication message is collectively referred to as TCI state below.

[0094] The indication information may be sent via one signaling or via multiple signalings.

[0095] The multiple reference signals may include at least one of the following: a tracking reference signal (CSI-RS for tracking, TRS), SSB. Of course, the reference may also be other signals, which are not specifically limited here. In one implementation, the multiple reference signals may be configured by high-level signaling (such as radio resource control (RRC) signaling).

[0096] In an exemplary description, a data channel or a control channel may include a demodulation reference signal (DMRS), wherein the DMRS may be configurable.

[0097] In one example, the TCI state may include configuration information indicating the quasi co-location information, the configuration information including a reference signal list, and the reference signal list including identifiers of multiple reference signals. The above method associates the QCL information with the multiple reference signals by carrying the identifiers of multiple reference signals in the reference signal list included in the configuration information of the QCL information.

[0098] Exemplarily, the configuration information of the TCI state may be:

[0099]

[0100] Among them, QCL-Info is the configuration information indicating the QCL information, and csi-rs-ResourceIdList and ssbList are reference signal lists. If the reference signal is TRS, the csi-rs-ResourceIdList includes multiple TRS identifiers, and the multiple TRS are associated with the QCL information. If the reference signal is SSB, the ssbList includes multiple SSB identifiers, and the multiple SSBs are associated with the QCL information. Among them, the TRSs corresponding to the multiple TRS identifiers in the csi-rs-ResourceIdList can belong to different NZP-CSI-RS-ResourceSets with trs-Info. The SSBs corresponding to the multiple SSB indices in the ssbList can correspond to different beams.

[0101] In another example, the TCI state may include multiple configuration information indicating the quasi co-location information, and the multiple configuration information is associated with multiple reference signals one by one. Each configuration information includes reference signal information, and the reference signal information includes an identifier of the reference signal associated with the configuration information. In the above manner, by including multiple configuration information in the TCI state, one configuration information is associated with one reference signal. The multiple configuration information may indicate the same quasi co-location type, such as 'QCL-typeA', but is associated with different reference signals, thereby associating the QCL information with multiple reference signals.

[0102] Exemplarily, the TCI state can be configured as: one "type A", wherein the "type A includes a CSI-RS in an NZP-CSI-RS-ResourceSet with trs-Info. Or, two "type A", the CSI-RS resources included in the two "type A" belong to two different NZP-CSI-RS-ResourceSets with trs-Info. If applicable, the TCI state can also be configured as: "type D", which can include the same CSI-RS resources as "type A". Among them, the NZP-CSI-RS-ResourceSet can be configured through high-level signaling (such as RRC signaling).

[0103] In one implementation, step S301 may be implemented as follows: for the control channel, the network device may configure multiple TCI states through the high-level RRC. For example, 64 TCI states may be configured for each CORESET. And a TCI state to be used currently may be activated through a media access control control element (MAC CE).

[0104] In another implementation, step S301 may be implemented as follows: for a data channel, the network device may configure multiple TCI states through a high-level RRC, for example, 128 TCI states. And activate at least one TCI state through a MAC CE. For example, when a TCI state is activated, the TCI state may be understood as the TCI state currently to be used; when more than one TCI state is activated, such as activating 8 TCI states, the TCI state currently to be used is indicated through downlink control information (DCI).

[0105] S302, multiple network devices send control channels or data channels to the terminal device according to the quasi-co-location information. Correspondingly, the terminal device receives the control channels or data channels from the multiple network devices.

[0106] S303, the terminal device estimates the Doppler frequency offset according to the quasi co-location information between the terminal device and the multiple reference signals to obtain a comprehensive Doppler frequency offset estimation result.

[0107] In one implementation, the terminal device can perform Doppler frequency offset estimation on multiple reference signals according to the quasi-co-location information, obtain Doppler frequency offset estimation results corresponding to the multiple reference signals, and combine the Doppler frequency offset estimation results corresponding to the multiple reference signals to obtain a comprehensive Doppler frequency offset estimation result.

[0108] For example, if the indication information indicates that the data channel has a quasi-co-location relationship of type A with TRS1, TRS2, and TRS3, the terminal device can respectively perform Doppler frequency offset estimation on TRS1, TRS2, and TRS3 according to type A, and obtain the Doppler frequency offset estimation result of TRS1, the Doppler frequency offset estimation result of TRS2, and the Doppler frequency offset estimation result of TRS3. Then, the Doppler frequency offset estimation result of TRS1, the Doppler frequency offset estimation result of TRS2, and the Doppler frequency offset estimation result of TRS3 are combined to obtain a comprehensive Doppler frequency offset estimation result.

[0109] S304, the terminal device demodulates the control channel or the data channel based on the comprehensive Doppler frequency offset estimation result.

[0110] In one implementation, the terminal device may perform time-frequency offset calibration and channel estimation based on the comprehensive Doppler frequency offset estimation result to obtain a channel estimation result, and demodulate the control channel or the data channel based on the channel estimation result.

[0111] In order to better understand the data transmission method provided in the first embodiment, the data transmission process is described in detail below in conjunction with specific scenarios.

[0112] One scenario may be that network device 1 and network device 2 jointly send data 1 to UE. It should be understood that this is only an exemplary description and does not specifically limit the number of network devices, the number of reference signals, etc. in the data transmission process.

[0113] like Figure 4 As shown, the data transmission process can be:

[0114] A1, network device 1 and network device 2 send DCI1 to UE, where DCI1 indicates TCI state, where TCI state indicates QCL information of the data channel, where QCL information indicates that the data channel has a quasi-co-location relationship with TRS1 and TRS2.

[0115] In an exemplary description, the TCI state can be configured as:

[0116]

[0117]

[0118] Wherein, referenceSignal is the associated reference signal type, here TRS, i.e., CSI-RS for tracking, csi-rsResourceIdList is the associated reference signal identifier list, specifically including NZP-CSI-RS-ResourceId[1] and NZP-CSI-RS-ResourceId[2], NZP-CSI-RS-ResourceId[1] refers to TRS1, and NZP-CSI-RS-ResourceId[2] refers to TRS2. In this exemplary description, TCI-State may also include other quasi-co-location information, such as qcl-Type2.

[0119] In another exemplary description, the TCI state may be:

[0120]

[0121]

[0122] Among them, referenceSignal in qcl-Type1 and qcl-Type2 indicates that different reference signals are associated, but they have the same qcl-Type, such as both can be type A. qcl-Type1 indicates that the data channel and TRS1 have a quasi-co-location relationship, and the quasi-co-location relationship is type A quasi-co-location type, and qcl-Type2 indicates that the data channel and TRS2 have a quasi-co-location relationship, and the quasi-co-location relationship is type A quasi-co-location type. In this exemplary description, TCI-State can also include other quasi-co-location information, such as qcl-Type3.

[0123] A2, network device 1 sends data 1 to UE according to TRS1, and network device 2 sends data 1 to UE according to TRS2.

[0124] A3: The UE estimates the Doppler frequency offset of TRS1 and TRS2 respectively according to the received TCI state, and obtains the Doppler frequency offset estimation result of TRS1 and the Doppler frequency offset estimation result of TRS2.

[0125] A4, the UE combines the Doppler frequency offset estimation result of TRS1 and the Doppler frequency offset estimation result of TRS2 to obtain a comprehensive Doppler frequency offset estimation result.

[0126] A5. The UE performs time-frequency offset calibration and channel estimation according to the comprehensive Doppler frequency offset estimation result to obtain a channel estimation result.

[0127] A6, UE demodulates data 1 according to the channel estimation result.

[0128] Through the solution provided in the above-mentioned embodiment 1, quasi-co-site information is associated with multiple reference signals, that is, the data channel and the multiple reference signals have a quasi-co-site relationship, so that the terminal device can estimate more accurate channel information and Doppler frequency deviation based on multiple reference signals in the presence of multipath signals, thereby improving the accuracy of channel estimation, such as the accuracy of the channel estimation time domain difference, etc., to improve the reception performance.

[0129] Embodiment 2: The present application provides another data transmission method, which can be applied to a communication system of SFN networking, in which multiple network devices can use the same frequency to jointly send data to a terminal device. In an exemplary description, the multiple network devices may be RRHs, and the multiple network devices are connected to the same BBU. For the convenience of description, the following description is made by taking RRH as an example.

[0130] In this method, the network device configures two or more sets of TCI states associated with different RRHs for the UE. At a certain moment, the network device activates only one TCI state, and only N RRHs among the multiple RRHs send data to the UE according to the TCI state, where N is an integer greater than or equal to 1. The following is an example of N being 1. Figure 5 As shown, the data transmission process can be:

[0131] B1, the first RRH sends a first DCI to the terminal device, where the first DCI is used to activate the first TCIstate currently to be used, and sends data 1 to the terminal device according to the first TCI state.

[0132] B2: The terminal device demodulates data 1 according to the first TCI state.

[0133] In one implementation, the terminal device can perform time-frequency offset tracking and channel estimation according to the first TCI state, and demodulate data 1. Specifically, Doppler frequency offset estimation can be performed to obtain a Doppler frequency offset estimation result. Time-frequency offset calibration and channel estimation are performed according to the Doppler frequency offset estimation result to obtain a channel estimation result, and data 1 is demodulated according to the channel estimation result.

[0134] B3, the terminal device measures the channel quality of the first RRH and one or more other RRHs, wherein the first RRH and the one or more other RRHs are connected to the same BBU, and the quality parameters are used to characterize the parameters of the reference signal quality, such as the quality parameters may be reference signal received power (reference signal received power, RSRP), reference signal received quality (reference signal received quality, RSRQ), etc.

[0135] B4, the terminal device reports a quality parameter set to the first RRH, where the quality parameter set includes quality parameters of the first RRH and one or more other RRHs.

[0136] In one implementation, the terminal device may periodically measure and report a set of quality parameters.

[0137] B5. The first RRH sends the measured quality parameter set to the BBU.

[0138] B6, the BBU determines the RRH that will provide services to the terminal device according to the quality parameter set reported by the terminal device. Assume that the BBU determines that the RRH that will provide services to the terminal device is switched from the first RRH to the second RRH.

[0139] In one implementation, the BBU may determine that the RRH corresponding to the maximum quality parameter in the quality parameter set is the RRH provided for the terminal device.

[0140] In another implementation, the BBU can determine the quality parameter change process of each RRH based on the historical data of the quality parameters of each RRH, and determine the RRH that provides service for the terminal device based on the change process. For example, the RRH whose quality parameter gradually increases is determined to be the RRH that provides service for the terminal device.

[0141] In another implementation, the BBU may determine the quality parameters in the quality parameter set that are greater than the quality parameter threshold value, determine the quality parameter change process of each RRH based on the historical data of the RRHs corresponding to these quality parameters, and determine the RRH that provides services for the terminal device based on the change process. For example, the RRH whose quality parameter gradually increases is determined to be the RRH that provides services for the terminal device.

[0142] Of course, the BBU may also use other methods to determine the RRH provided for the terminal device, which are not listed here one by one.

[0143] B7, the second RRH sends a second DCI to the terminal device, where the second DCI is used to activate the second TCI state currently to be used. The second TCI state may be the same as the first TCI state or may be different from the first TCI state, which is not specifically limited here.

[0144] In one implementation, after the BBU determines to switch the RRH provided for the terminal device from the first RRH to the second RRH, the first RRH may stop sending data 1 to the terminal device.

[0145] B8, the terminal device activates the second TCI state. In one implementation, if the second TCI state is the same as the first TCI state, after step B7, step B9 may be performed, that is, step B8 may not be performed.

[0146] B9, the second RRH sends data 1 to the terminal device according to the second TCI state.

[0147] B10, the terminal device demodulates data 1 according to the second TCI state.

[0148] The process of the terminal device demodulating data 1 according to the second TCI state is similar to the process of the terminal device demodulating data 1 according to the first TCIstate, and the similarities will not be repeated.

[0149] In the above-mentioned second embodiment, the terminal device only needs to track one TCI state at a time, that is, only one set of TCI states is activated for the terminal device, which can reduce the implementation complexity.

[0150] Embodiment 3: The present application provides another data transmission method, which can be applied to a communication system of SFN networking, in which multiple network devices can use the same frequency to jointly send data to a terminal device. In an exemplary description, the multiple network devices may be RRHs, and the multiple network devices are connected to the same BBU. For the convenience of description, the following description is made by taking RRH as an example.

[0151] In this method, the network device activates at least two TCI states for the terminal device, and at a certain moment, only N RRHs among multiple RRHs send data to the UE, where N is an integer greater than or equal to 1. The following is an example in which the network device activates two TCI states, and at a certain moment, only one RRH among multiple RRHs sends data to the UE. Figure 5As shown, the data transmission process can be:

[0152] C1, the first RRH sends a first DCI to the terminal device, where the first DCI is used to indicate a first TCI state of two TCI states, where the first TCI state is used for data transmission under the current first RRH.

[0153] In one implementation, the BBU may configure multiple TCI states through high-level RRC signaling, and activate two of the TCI states through MAC CE.

[0154] C2-C7, for details, please refer to steps B3-B8 in the above-mentioned second embodiment.

[0155] C8, the second RRH sends a second DCI to the terminal device, where the second DCI is used to indicate a second TCI state of the two TCI states, wherein the second TCI state may be the same as the first TCI state or may be different from the first TCI state, which is not specifically limited here.

[0156] In one implementation, after the BBU determines to switch the RRH provided for the terminal device from the first RRH to the second RRH, the first RRH may stop sending data 1 to the terminal device.

[0157] C9-C10, for details, please refer to steps B9-B10 in the above-mentioned second embodiment.

[0158] In Embodiment 3, the data channel and the control channel may use the same TCI state or different TCI states. If the data channel and the control channel use the same TCI state, the TCI state of the control channel to be newly switched may be indicated by MAC-CE, and the TCI state may be applicable to the data channel and the control channel. In this implementation, two sets of TRS associated with different TCI states may be configured. If the data channel and the control channel use different TCIstates, the TCI state of the control channel may remain unchanged, and the TCI state of the data channel may be dynamically indicated by DCI according to the specific RRH providing the service.

[0159] In the above-mentioned third embodiment, the terminal device can obtain accurate Doppler frequency deviation information according to different TCI states within different coverage ranges, thereby avoiding the Doppler expansion problem caused by multipath, and then can estimate and correct the Doppler frequency deviation more accurately, so that the UE can lock the beam for transmitting and receiving data more accurately during high-speed movement, thereby improving the receiving performance. In addition, in the above-mentioned third embodiment, the terminal device simultaneously tracks two or more sets of TCI states, so that when the terminal device switches the TCI state, it can save the time of activating the new TCI state, thereby avoiding the interruption of data transmission to a certain extent.

[0160] Embodiment 4: The present application provides another data transmission method, which can be applied to a communication system of SFN networking, in which multiple network devices can use the same frequency to jointly send data to a terminal device. In an exemplary description, the multiple network devices may be RRHs, and the multiple network devices are connected to the same BBU. For the convenience of description, the following description is made by taking RRH as an example.

[0161] In this method, the network device activates a TCI state, and the configured reference signals are associated with the TCI state. All RRHs connected to the same BBU jointly send data to the terminal device according to the TCI state. For example, RRH1 and RRH2 both send DCI1 to the terminal device, and the DCI1 is used to indicate TCI state1. RRH1 and RRH2 both use TCI state1 to send data 1 to the terminal device. Figure 6 shown.

[0162] Embodiment 5: The present application provides another data transmission method, which can be applied to a communication system of SFN networking, in which multiple network devices can use the same frequency to jointly send data to a terminal device. In an exemplary description, the multiple network devices may be RRHs, and the multiple network devices are connected to the same BBU. For the convenience of description, the following description is made by taking RRH as an example.

[0163] In this method, the network device can configure multiple TCI states associated with different TRSs for the UE, and different RRHs can independently indicate the corresponding TCI states through DCI and schedule different data. For example, RRH1 indicates TCI state1 to the terminal device through DCI1, and uses TCI state1 to send data 1 to the terminal device, and RRH2 indicates TCI state2 to the terminal device through DCI2, and uses TCI state2 to send data 2 to the terminal device. Figure 7Wherein, TCI state1 and TCI state2 may be the same or different, which is not specifically limited here.

[0164] In the fifth embodiment, different RRHs can independently indicate corresponding TCI states through DCI and schedule different data, which can improve data reception of cell edge users and further improve spectrum utilization.

[0165] Based on the same technical concept as the method embodiment, the present application embodiment provides a data transmission device. The structure of the data transmission device can be as follows Figure 8 As shown, it includes a processing unit 801 and a communication unit 802.

[0166] In one implementation, the data transmission device can be used to implement Figure 3 or Figure 4 In the embodiment of the method executed by the terminal device, the device may be the terminal device itself, or a chip or chipset in the terminal device or a part of the chip used to execute the function of the related method. Among them, the communication unit 802 is used to receive an indication information, the indication information is used to indicate the quasi-co-location information of the control channel or the data channel, the quasi-co-location information indicates that the control channel or the data channel has a quasi-co-location relationship with multiple reference signals; and, receive control channels or data channels from multiple network devices; the processing unit 801 is used to perform Doppler frequency offset estimation based on the quasi-co-location information between the multiple reference signals to obtain a comprehensive Doppler frequency offset estimation result; and, demodulate the control channel or the data channel based on the comprehensive Doppler frequency offset estimation result.

[0167] The processing unit 801, when performing Doppler frequency offset estimation based on quasi-co-site information with multiple reference signals to obtain a comprehensive Doppler frequency offset estimation result, can be specifically used to: perform Doppler frequency offset estimation on multiple reference signals respectively according to the quasi-co-site information to obtain Doppler frequency offset estimation results corresponding to the multiple reference signals respectively; and combine the Doppler frequency offset estimation results corresponding to the multiple reference signals to obtain a comprehensive Doppler frequency offset estimation result.

[0168] Exemplarily, the indication information may include configuration information indicating quasi co-location information, the configuration information includes a reference signal list, and the reference signal list includes identifiers of multiple reference signals.

[0169] Alternatively, the indication information may also include a plurality of configuration information indicating quasi co-location information, wherein the plurality of configuration information is associated one-to-one with the plurality of reference signals.

[0170] The multiple reference signals may include at least one of the following: TRS, SSB.

[0171] In another implementation, the data transmission device can be used to implement Figure 3 or Figure 4 In the embodiment of the method executed by the network device, the device may be the network device itself, or a chip or chipset in the network device or a part of the chip used to execute the function of the related method. The communication unit 802 is used to send an indication information, the indication information is used to indicate the quasi-co-location information of the control channel or the data channel, and the quasi-co-location information indicates that multiple reference signals of the control channel or the data channel have a quasi-co-location relationship; the processing unit 801 is used to send the control channel or the data channel to the terminal device through the communication unit 802 according to the quasi-co-location information.

[0172] Exemplarily, the indication information may include configuration information indicating quasi co-location information, the configuration information includes a reference signal list, and the reference signal list includes identifiers of multiple reference signals.

[0173] Alternatively, the indication information may also include a plurality of configuration information indicating quasi co-location information, wherein the plurality of configuration information is associated one-to-one with the plurality of reference signals.

[0174] The multiple reference signals may include at least one of the following: TRS, SSB.

[0175] In one implementation, the data transmission device can be used to implement Figure 5 The method performed by the terminal device in the second embodiment shown, the device may be the terminal device itself, or a chip or chipset in the terminal device or a part of the chip for performing the function of the related method. Among them, the communication unit 802 is used to receive the first information, the first information is used to activate a transmission configuration indication TCI state, the TCI state is associated with a tracking reference signal TRS resource; and, receive the TRS from the first radio frequency remote head RRH, the first RRH is the RRH currently providing service among multiple RRHs connected to the same baseband processing unit BBU, and the TRS is the TRS corresponding to the TRS resource. The processing unit 801 is used to perform at least one of the following based on the TRS: channel estimation, Doppler frequency deviation estimation.

[0176] Optionally, the communication unit 802 is further configured to receive second information from the first RRH, where the second information is used to indicate switching from the first RRH to the second RRH. The processing unit 801 is further configured to switch from the first RRH to the second RRH.

[0177] Optionally, the processing unit 801 is further configured to perform signal quality measurements on reference signals sent by multiple RRHs before the communication unit 802 receives the second information from the first RRH to obtain measurement values ​​corresponding to the multiple RRHs. The communication unit is further configured to report the measurement values ​​corresponding to the multiple RRHs to the first RRH.

[0178] Optionally, the communication unit 802 is further configured to receive data from the first RRH according to at least one of the following results obtained by performing channel estimation and Doppler frequency offset estimation based on the TRS before the processing unit 801 switches from the first RRH to the second RRH.

[0179] In one implementation, the data transmission device can be used to implement Figure 5 The method performed by the terminal device in the second embodiment shown, the device may be the terminal device itself, or a chip or chipset in the terminal device or a part of the chip for performing the function of the related method. Wherein, the communication unit 802 is used to receive the first information, the first information is used to activate the first TCI state and the second TCI state; and, receive the first TRS from the first RRH and the second TRS from the second RRH, the first RRH is the RRH currently providing service among multiple RRHs connected to the same baseband processing unit BBU, the first TRS is the TRS corresponding to the first TCI state, and the second TRS is the TRS corresponding to the second TCI state; the processing unit 801 is used to perform at least one of the following based on the first TRS: channel estimation, Doppler frequency offset estimation, or, after switching from the first RRH to the second RRH, perform at least one of the following based on the second TRS: channel estimation, Doppler frequency offset estimation.

[0180] Optionally, the communication unit 802 is further used to receive second information from the first RRH before the processing unit 801 switches from the first RRH to the second RRH, where the second information is used to indicate switching from the first RRH to the second RRH.

[0181] The processing unit 801 may also be configured to perform signal quality measurements on the reference signals sent by the multiple RRHs to obtain measurement values ​​corresponding to the multiple RRHs before the communication unit 802 receives the second information from the first RRH. The communication unit 802 may also be configured to report the measurement values ​​corresponding to the multiple RRHs to the first RRH.

[0182] Optionally, the processing unit 801 is also used to receive data from the first RRH through the communication unit 802 according to a result obtained by performing at least one of the following based on the first TRS: channel estimation, Doppler frequency offset estimation.

[0183] Optionally, the processing unit 801 is also used to receive data from the second RRH through the communication unit 802 according to a result obtained by performing at least one of the following based on the second TRS: channel estimation, Doppler frequency offset estimation.

[0184] In one implementation, the data transmission device can be used to implement Figure 6 The method performed by the terminal device in the embodiment shown, the device may be the terminal device itself, or a chip or chipset in the terminal device or a part of the chip used to perform the function of the related method. The communication unit 802 is used to perform the transceiver action of the terminal device in the above-mentioned embodiment 4, such as receiving DCI1, etc. The processing unit 801 is used to perform other actions of the terminal device in the above-mentioned embodiment 4 except the transceiver action, or to send and receive signals through the communication unit 802, such as receiving DCI1 through the communication unit 802.

[0185] In one implementation, the data transmission device can be used to implement Figure 7 The method executed by the terminal device in the embodiment shown, the device may be the terminal device itself, or a chip or chipset in the terminal device or a part of the chip used to execute the function of the related method. Among them, the communication unit 802 is used to perform the transceiver action of the terminal device in the above-mentioned embodiment 5, such as receiving data sent by multiple network devices, etc., and the processing unit 801 is used to perform other actions of the terminal device in the above-mentioned embodiment 4 except the transceiver action, or to send and receive signals through the communication unit 802, such as receiving data sent by multiple network devices through the communication unit 802.

[0186] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. It is understood that the functions or implementations of each module in the embodiments of the present application may further refer to the relevant description of the method embodiment.

[0187] In one possible manner, the data transmission device may be as follows Fig. 9 As shown, the data transmission device may be a communication device or a chip in a communication device, wherein the communication device may be a terminal device or a network device. The device may include a processor 901, a communication interface 902, and a memory 903. The processing unit 801 may be the processor 901. The communication unit 802 may be the communication interface 902.

[0188] The processor 901 may be a central processing unit (CPU) or a digital processing unit, etc. The communication interface 902 may be a transceiver, an interface circuit such as a transceiver circuit, etc., or a transceiver chip, etc. The device further includes: a memory 903 for storing programs executed by the processor 901. The memory 903 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), such as a random-access memory (RAM). The memory 903 is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0189] The processor 901 is used to execute the program code stored in the memory 903, specifically to execute the actions of the processing unit 801, which will not be described in detail in this application. The communication interface 902 is specifically used to execute the actions of the communication unit 802, which will not be described in detail in this application.

[0190] The specific connection medium between the communication interface 902, the processor 901 and the memory 903 is not limited in the embodiment of the present application. Fig. 9 In the embodiment, the memory 903, the processor 901 and the communication interface 902 are connected via a bus 904. Fig. 9 The connections between the other components are shown in bold lines, which are only for illustration and are not intended to be limiting. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig. 9 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0191] An embodiment of the present invention further provides a computer-readable storage medium for storing computer software instructions required to be executed by the above-mentioned processor, which includes a program required to be executed by the above-mentioned processor.

[0192] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that includes one or more available media integrated. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., an SSD), etc.

[0193] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0194] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0195] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0196] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A data transmission method, characterized in that: The method includes: receiving indication information, where the indication information is used to indicate quasi co-location information of a control channel or a data channel, where the quasi co-location information indicates that the control channel or the data channel has a quasi co-location relationship with a plurality of reference signals; receiving control channels or data channels from a plurality of network devices; Perform Doppler frequency offset estimation based on the quasi co-location information between the multiple reference signals to obtain a comprehensive Doppler frequency offset estimation result; The control channel or the data channel is demodulated based on the integrated Doppler frequency offset estimation result.

2. The method according to claim 1, characterized in that Performing Doppler frequency offset estimation according to the quasi co-location information between the multiple reference signals includes: According to the quasi co-location information, respectively perform Doppler frequency offset estimation on the multiple reference signals to obtain Doppler frequency offset estimation results corresponding to the multiple reference signals respectively; The Doppler frequency offset estimation results corresponding to the multiple reference signals are combined to obtain the comprehensive Doppler frequency offset estimation result.

3. The method according to claim 1 or 2, characterized in that The indication information includes configuration information indicating the quasi co-location information, the configuration information includes a reference signal list, and the reference signal list includes identifiers of the multiple reference signals.

4. The method according to claim 1 or 2, characterized in that: The indication information includes a plurality of configuration information, wherein the configuration information indicates the quasi co-location information, and the plurality of configuration information are associated one by one with the plurality of reference signals.

5. The method according to claim 1, characterized in that The multiple reference signals may include at least one of the following: a tracking reference signal TRS, and a synchronization signal broadcast channel block SSB.

6. A data transmission method, characterized in that: The method includes: Sending indication information, where the indication information is used to indicate quasi co-location information of a control channel or a data channel, where the quasi co-location information indicates that the control channel or the data channel has a quasi co-location relationship with a plurality of reference signals; A control channel or a data channel is sent to the terminal device according to the quasi co-location information.

7. The method according to claim 6, characterized in that The indication information includes configuration information indicating the quasi co-location information, the configuration information includes a reference signal list, and the reference signal list includes identifiers of the multiple reference signals.

8. The method according to claim 6, characterized in that The indication information includes a plurality of configuration information, wherein the configuration information indicates the quasi co-location information, and the plurality of configuration information are associated one by one with the plurality of reference signals.

9. The method according to any one of claims 6 to 8, characterized in that The multiple reference signals may include at least one of the following: a tracking reference signal TRS, and a synchronization signal broadcast channel block SSB.

10. A data transmission device, characterized in that: The device includes: A communication unit, configured to receive indication information, wherein the indication information is used to indicate quasi-co-location information of a control channel or a data channel, wherein the quasi-co-location information indicates that the control channel or the data channel has a quasi-co-location relationship with a plurality of reference signals; and receive control channels or data channels from a plurality of network devices; A processing unit is used to perform Doppler frequency offset estimation based on the quasi co-location information between the multiple reference signals to obtain a comprehensive Doppler frequency offset estimation result; and demodulate the control channel or the data channel based on the comprehensive Doppler frequency offset estimation result.

11. The device according to claim 10, characterized in that The processing unit, when performing Doppler frequency offset estimation according to the quasi co-location information between the multiple reference signals to obtain a comprehensive Doppler frequency offset estimation result, is specifically used to: According to the quasi co-location information, respectively perform Doppler frequency offset estimation on the multiple reference signals to obtain Doppler frequency offset estimation results corresponding to the multiple reference signals respectively; The Doppler frequency offset estimation results corresponding to the multiple reference signals are combined to obtain the comprehensive Doppler frequency offset estimation result.

12. The device according to claim 10 or 11, characterized in that The indication information includes configuration information indicating the quasi co-location information, the configuration information includes a reference signal list, and the reference signal list includes identifiers of the multiple reference signals.

13. The device according to claim 10 or 11, characterized in that The indication information includes a plurality of configuration information, wherein the configuration information indicates the quasi co-location information, and the plurality of configuration information are associated one by one with the plurality of reference signals.

14. The device according to claim 10, characterized in that The multiple reference signals may include at least one of the following: a tracking reference signal TRS, and a synchronization signal broadcast channel block SSB.

15. A data transmission device, characterized in that: The device includes: A communication unit, configured to send indication information, wherein the indication information is used to indicate quasi co-location information of a control channel or a data channel, wherein the quasi co-location information indicates that a plurality of reference signals of the control channel or the data channel have a quasi co-location relationship; A processing unit is used to send a control channel or a data channel to a terminal device through the communication unit according to the quasi co-location information.

16. The device according to claim 15, characterized in that The configuration information of the quasi co-location information includes a reference signal list, and the reference signal list includes identifiers of the multiple reference signals.

17. The device according to claim 15, characterized in that The indication information includes a plurality of configuration information, wherein the configuration information indicates the quasi co-location information, and the plurality of configuration information are associated one by one with the plurality of reference signals.

18. The device according to any one of claims 15 to 17, characterized in that The multiple reference signals may include at least one of the following: a tracking reference signal TRS, and a synchronization signal broadcast channel block SSB.

19. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores programs or instructions, and when the programs or instructions are read and executed by one or more processors, they can implement the method described in any one of claims 1 to 5, or when the programs or instructions are read and executed by one or more processors, they can implement the method described in any one of claims 6 to 9.

20. A computer program product, characterized in that When the computer program product is run on a terminal device, the terminal device executes the method according to any one of claims 1 to 5; or When the computer program product runs on a network device, the network device is enabled to execute the method according to any one of claims 6 to 9.

21. A communication device, characterized in that: It comprises a processor and a communication interface, wherein the communication interface is used to receive computer program code or instructions and transmit them to the processor; the processor runs the computer program code or instructions so that the communication device implements the method according to any one of claims 1 to 9.

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