Transmission method and apparatus

Abstract

A transmission method and apparatus. The method comprises: a terminal device receives a plurality of groups of downlink reference signals, and sends first information on the basis of the plurality of groups of downlink reference signals. By means of the first information, the terminal device indicates to network devices a plurality of frequencies, a plurality of groups of frequencies, or at least one frequency difference. One frequency among the plurality of frequencies, one group of frequencies among the plurality of groups of frequencies, or one frequency in the at least one frequency difference is associated with a group of downlink reference signals among the plurality of groups of downlink reference signals. Each group of downlink reference signals among the plurality of groups of downlink reference signals corresponds to one downlink reference signal resource or one downlink reference signal resource set. The plurality of frequencies, the plurality of groups of frequencies or at least one frequency difference indicated by the first information can be used for the network devices to determine estimated values of frequency deviations when the plurality of network devices transmit signals to the same terminal device, thereby ensuring the transmission performance of the plurality of network devices associated with the plurality of groups of downlink reference signals during coherent joint transmission to the same terminal device.

Description

Transmission method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on February 8, 2024, with application number 202410178288.5 and invention name “Transmission Method and Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and more particularly, to a transmission method and apparatus. Background Art

[0003] Coherent joint transmission (CJT) is a multi-antenna technology commonly used in wireless communication systems, especially in multi-user, multi-cell systems. The main idea of ​​CJT is to improve the received signal to interference plus noise ratio (SINR) of the terminal equipment (UE) while reducing inter-cell interference through technologies such as joint transmission and joint scheduling of multiple network devices. Specifically, when a UE is served by multiple network devices, these network devices can use CJT to coherently superimpose the received signals at the UE and coherently cancel the interference, thereby improving network throughput and user experience. In this process, the devices can jointly design transmission weights based on the joint channels from multiple network devices to the UE, and transmit the same data stream to ensure the coherent superposition of the received signals on the UE side.

[0004] However, since the coherent processing of signals needs to be performed under clock control, considering the limitations of hardware accuracy, different network devices controlled by different clock sources have frequency deviations, which leads to a phase difference accumulated over time in the signals sent by the multiple network devices to the UE. The signals sent by the multiple network devices to the UE cannot be coherent in phase, that is, the effect of CJT transmission cannot be guaranteed. Summary of the Invention

[0005] The present application provides a transmission method and apparatus that can ensure the performance of CJT transmission of multiple network devices.

[0006] In a first aspect, a transmission method is provided, which can be executed by a terminal device or by a component of the terminal device (such as a chip, circuit, or chip system). For ease of understanding, the following description is based on the example of execution by a terminal device.

[0007] The method includes: receiving multiple groups of downlink reference signals, each group of downlink reference signals in the multiple groups of downlink reference signals corresponds to a downlink reference signal resource or a downlink reference signal resource set; sending first information, the first information is determined according to the multiple groups of downlink reference signals, the first information is used to indicate multiple frequencies or multiple frequency groups, each frequency in the multiple frequencies or each frequency group in the multiple frequency groups is determined by a group of downlink reference signals in the multiple groups of downlink reference signals, or, the first information is used to indicate at least one frequency difference, each frequency difference in the at least one frequency difference is determined by two groups of downlink reference signals in the multiple groups of downlink reference signals, wherein each frequency group includes P frequencies, and P is a positive integer greater than or equal to 2.

[0008] It should be understood that the present application does not limit the correspondence between each group of downlink reference signals in the multiple groups of downlink reference signals and a downlink reference signal resource or a downlink reference signal resource set. Wherein, each group of downlink reference signals in the multiple groups of downlink reference signals corresponds to a downlink reference signal resource or a downlink reference signal resource set. For example, when each group of downlink references corresponds to a downlink reference signal resource, the downlink reference signal resource may be a semi-persistent reference signal resource or a periodic reference signal resource. When each group of downlink reference signals corresponds to a downlink reference signal resource set, the downlink reference signal resource set includes multiple reference signal resources, and the multiple reference signal resources are non-periodic reference signal resources. For another example, when each group of downlink references corresponds to a downlink reference signal resource, the downlink reference signal resource may also be a non-periodic reference signal resource. When each group of downlink reference signals corresponds to a downlink reference signal resource set, the multiple reference signal resources included in the downlink reference signal resource set may also be semi-persistent reference signal resources or periodic reference signal resources.

[0009] It should also be understood that each of the at least one frequency difference is determined by two groups of downlink reference signals among the multiple groups of downlink reference signals, one of the two groups of downlink reference signals (e.g., downlink reference signal group #1) may be a base reference signal group, and the other of the two groups of downlink reference signals may be another group of downlink reference signals among the multiple groups of downlink reference signals except downlink reference signal group #1. The first information is used to indicate at least one frequency difference, and the at least one frequency difference is determined based on downlink reference signal group #1 and another group of downlink reference signals among the multiple groups of downlink reference signals except downlink reference signal group #1.

[0010] According to the method provided in this application, a terminal device transmits first information based on multiple sets of received downlink reference signals. The terminal device can indicate multiple frequencies or multiple sets of frequencies, or at least one frequency difference, to a network device through the first information. The multiple frequencies, multiple sets of frequencies, or at least one frequency difference can determine the frequency deviation between multiple network devices, allowing the network device to compensate for the phase difference accumulated over time when multiple network devices transmit signals to the terminal device due to the frequency deviation, thereby ensuring the performance of coherent joint transmission by the multiple network devices.

[0011] With reference to the first aspect, in some possible implementations, each group of downlink reference signals in the multiple groups of downlink reference signals includes at least one downlink reference signal.

[0012] It should be understood that multiple groups of downlink reference signals correspond one-to-one to multiple network devices. One of the multiple network devices corresponds to one group of downlink reference signals in the multiple groups of downlink reference signals. The group of downlink reference signals includes one or more downlink reference signals. The one or more downlink reference signals are transmitted on a corresponding downlink reference signal resource or a downlink reference signal resource set.

[0013] In combination with the first aspect, in some possible implementations, the first information is used to indicate multiple indexes, each of the multiple indexes is associated with each frequency in the multiple frequencies, or each of the multiple indexes is associated with the P frequencies included in each frequency group in the multiple frequency groups.

[0014] It should be understood that when the first information is used to indicate each frequency in a plurality of frequencies or each frequency in a plurality of frequency groups, the first information may be an index corresponding to the indicated frequency, which may also be referred to as an index. The index may be represented in binary form or in other forms, which is not limited in this application.

[0015] With reference to the first aspect, in some possible implementations, the multiple indexes are multiple Doppler domain basis indexes, and the Doppler domain basis is associated with a group of downlink reference signals among the multiple groups of downlink reference signals.

[0016] It should also be understood that the multiple indexes are multiple Doppler basis indexes, wherein any one or more of the multiple indexes can be indexes of the same Doppler domain basis. For example, when the first information indicates multiple frequencies, each of the multiple frequencies is determined by a group of downlink reference signals in a plurality of groups of downlink reference signals; when the first information indicates multiple frequency groups, the multiple frequencies included in each frequency group in the multiple frequency groups are determined by a group of downlink reference signals in a plurality of groups of downlink reference signals. This group of reference signals corresponds to a Doppler domain basis. That is, the index corresponding to each frequency in the multiple frequencies is a different Doppler domain basis index, and the indexes corresponding to the multiple frequencies included in each frequency group in the multiple frequency groups belong to the same Doppler domain basis index.

[0017] In combination with the first aspect, in some possible implementations, the Doppler domain basis is a discrete Fourier transform (DFT) basis, and the Doppler domain basis includes N basis components, where N is a positive integer.

[0018] It should be understood that the Doppler domain basis is composed of DFT vectors of length N. The basis candidate set includes N vectors.

[0019] In combination with the first aspect, in some possible implementations, the method further includes: receiving first indication information, where the first indication information is used to indicate the N.

[0020] It should be understood that the value of N can be indicated to the terminal device by the network device, for example, by sending a first indication message, or pre-configured to the terminal device through other signaling, and this application does not limit this.

[0021] It should also be understood that the first indication information can be carried through media medium access control control element (MAC CE) signaling, or through radio resource control (RRC) signaling, for example, the first indication information is carried in the channel state information (CSI) reporting configuration.

[0022] In combination with the first aspect, in some possible implementations, one of the multiple indexes is an index corresponding to a basis component having a maximum modulus of a weighting coefficient associated with a Doppler domain basis among the multiple Doppler domain basis.

[0023] In combination with the first aspect, in some possible implementations, the multiple indexes include multiple index groups, and the P indexes in each index group in the multiple index groups are the indices corresponding to the P basis components with the largest modulus of the weighting coefficient associated with a Doppler domain basis in the multiple Doppler domain basis.

[0024] In combination with the first aspect, in some possible implementations, the method further includes: receiving second indication information, where the second indication information is used to indicate that one group of downlink reference signals among the multiple groups of downlink reference signals is a reference reference signal, and the two groups of downlink reference signals include the reference reference signal.

[0025] It should be understood that one group of downlink reference signals (e.g., the first group of downlink reference signals) among the multiple groups of downlink reference signals indicated by the second indication information, the frequency corresponding to the index in the Doppler domain basis associated with the indicated group of downlink reference signals is used as the reference frequency for the terminal device to determine at least one frequency difference indicated by the first information. The second indication information indicates the number of frequencies included in each of the multiple frequency groups indicated by the first information, that is, the second indication information indicates the number of frequencies in each frequency group reported by the terminal device.

[0026] In combination with the first aspect, in some possible implementations, the method further includes: receiving third indication information, where the third indication information is used to indicate the P.

[0027] In conjunction with the first aspect, in some possible implementations, the first information includes bits are used to indicate one index among the multiple indexes.

[0028] It should be understood that the operator Indicates rounding up.

[0029] In conjunction with the first aspect, in some possible implementations, the first information includes bits are used to indicate the relative index between two indexes in the multiple indexes, One of the bits is used to indicate the sign of the relative index. The other bits in the bits are used to indicate the size of the relative index.

[0030] In combination with the first aspect, in some possible implementations, the method further includes: sending a group of uplink reference signals, where the group of uplink reference signals are transmitted at equal intervals within the first time period.

[0031] In a second aspect, a transmission method is provided, which can be executed by a network device or a component of the network device (such as a chip or circuit or chip system). For ease of understanding, the following description is based on the example of execution by a network device.

[0032] The method includes: sending a group of first downlink reference signals, wherein the group of first downlink reference signals belongs to a group of downlink reference signals in multiple groups of downlink reference signals, and each group of downlink reference signals in the multiple groups of downlink reference information corresponds to a downlink reference signal resource or a downlink reference signal resource set; receiving first information from a terminal device, wherein the first information is determined according to the multiple groups of downlink reference signals, and the first information is used to indicate multiple frequencies or multiple frequency groups, and each frequency in the multiple frequencies or each frequency group in the multiple frequency groups is determined by a group of downlink reference signals in the multiple groups of downlink reference signals, or, the first information is used to indicate at least one frequency difference, and each frequency difference in the at least one frequency difference is determined by two groups of downlink reference signals in the multiple groups of downlink reference signals, and according to the first information, determining a transmission frequency, and the transmission frequency is used for downlink signal transmission with the terminal device, wherein each frequency group includes P frequencies, and P is a positive integer greater than or equal to 2.

[0033] According to the method provided in this application, a network device receives first information from a terminal device. The first information is determined based on multiple groups of downlink reference signals, including a group of downlink reference signals sent by the network device to the terminal device. The network device determines a frequency deviation between multiple network devices based on the multiple frequencies or multiple groups of frequencies, or at least one frequency difference, indicated by the first information. This allows the network device to compensate for the accumulated phase difference in signals sent by the multiple network devices to the terminal device caused by the frequency deviation, thereby ensuring the performance of coherent joint transmission by the multiple network devices.

[0034] It should be understood that the second aspect corresponds to the above-mentioned first aspect. The technical effects and related exemplary explanations can be found in the description of the above-mentioned first aspect and will not be repeated here.

[0035] With reference to the second aspect, in some possible implementations, each group of downlink reference signals in the multiple groups of downlink reference signals includes at least one downlink reference signal.

[0036] In combination with the second aspect, in some possible implementations, the first information is used to indicate multiple indexes, each of the multiple indexes is associated with each frequency in the multiple frequencies, or each of the multiple indexes is associated with P frequencies included in each frequency group in the multiple frequency groups.

[0037] With reference to the second aspect, in some possible implementations, the multiple indexes are multiple Doppler domain basis indexes, and the Doppler domain basis is associated with a group of downlink reference signals among the multiple groups of downlink reference signals.

[0038] In combination with the second aspect, in some possible implementations, the Doppler domain basis is a DFT basis, and the Doppler domain basis includes N basis components, where N is a positive integer.

[0039] In combination with the second aspect, in some possible implementations, the method further includes: sending first indication information, where the first indication information is used to indicate the N.

[0040] In combination with the second aspect, in some possible implementations, one of the multiple indexes is an index corresponding to a basis component having a maximum modulus of a weighting coefficient associated with a Doppler domain basis among the multiple Doppler domain basis.

[0041] In combination with the second aspect, in some possible implementations, the multiple indexes include multiple index groups, and the P indexes in each index group in the multiple index groups are the indices corresponding to the P multiple basis components with the largest modulus of the weighting coefficient associated with a Doppler domain basis in the multiple Doppler domain basis.

[0042] In combination with the second aspect, in some possible implementations, the method further includes: receiving second indication information, where the second indication information is used to indicate that one group of downlink reference signals among the multiple groups of downlink reference signals is a reference reference signal, and the two groups of downlink reference signals include the reference reference signal.

[0043] In combination with the second aspect, in some possible implementations, the method further includes: sending third indication information, where the third indication information is used to indicate the P.

[0044] In conjunction with the second aspect, in some possible implementations, the first information includes bits are used to indicate one index among the multiple indexes.

[0045] In conjunction with the second aspect, in some possible implementations, the first information includes bits are used to indicate the relative index between two indexes in the multiple indexes, One of the bits is used to indicate the sign of the relative index. bits and the other bits are used to indicate the size of the relative index.

[0046] In combination with the second aspect, in some possible implementation methods, determining the transmission frequency based on the first information includes: determining a frequency deviation estimate based on the first information; and performing frequency deviation compensation based on the frequency deviation estimate.

[0047] It should be understood that the network device performs the frequency deviation compensation based on the frequency deviation estimation value, and the network device performs the frequency deviation compensation to determine the transmission frequency of the signal transmitted to the terminal device.

[0048] In combination with the second aspect, in some possible implementations, the frequency deviation estimate is determined based on the transmission time interval of the set of first downlink reference signals, the N and an index among the multiple indexes.

[0049] In conjunction with the second aspect, in some possible implementations, the frequency deviation estimate satisfies:

[0050] in, represents a frequency deviation estimation value, Δt represents the transmission time interval, and I represents an index among the multiple indexes.

[0051] In combination with the second aspect, in some possible implementation methods, determining the transmission frequency based on the first information includes: determining the frequency deviation estimate based on the first frequency and the second frequency, the first frequency is determined by the network device based on the first information, and the second frequency is determined by the network device based on a group of uplink reference signals from the terminal device.

[0052] According to a third aspect, a transmission device is provided, comprising: a transceiver unit for receiving multiple groups of downlink reference signals, each group of downlink reference signals in the multiple groups of downlink reference signals corresponds to a downlink reference signal resource or a downlink reference signal resource set; the transceiver unit is further used to send first information, the first information being determined based on the multiple groups of downlink reference signals, the first information being used to indicate multiple frequencies or multiple frequency groups, each frequency in the multiple frequencies or each frequency group in the multiple frequency groups being determined by a group of downlink reference signals in the multiple groups of downlink reference signals, or the first information being used to indicate at least one frequency difference, each frequency difference in the at least one frequency difference being determined by two groups of downlink reference signals in the multiple groups of downlink reference signals, wherein each frequency group includes P frequencies, and P is a positive integer greater than or equal to 2.

[0053] The transceiver unit is also used to perform the related operations of receiving and / or sending in the first aspect mentioned above.

[0054] In one possible implementation, the transmission device further includes a processing unit, which is configured to perform other processing operations in addition to receiving and sending in the first aspect.

[0055] In a fourth aspect, a transmission device is provided, comprising: a transceiver unit, configured to send a group of first downlink reference signals, wherein the group of first downlink reference signals belongs to a group of downlink reference signals in multiple groups of downlink reference signals, and each group of downlink reference signals in the multiple groups of downlink reference information corresponds to a downlink reference signal resource or a downlink reference signal resource set; the transceiver unit, further configured to receive first information from a terminal device, wherein the first information is determined according to the multiple groups of downlink reference signals, and the first information is used to indicate multiple frequencies or multiple frequency groups, each frequency in the multiple frequencies or each frequency group in the multiple frequency groups is determined by a group of downlink reference signals in the multiple groups of downlink reference signals, or the first information is used to indicate at least one frequency difference, and each frequency in the at least one frequency difference is determined by two groups of downlink reference signals in the multiple groups of downlink reference signals; a processing unit, configured to determine a transmission frequency according to the first information, and the transmission frequency is used for downlink signal transmission with the terminal device, wherein each frequency group includes P frequencies, and P is a positive integer greater than or equal to 2.

[0056] The transceiver unit is further configured to perform related operations of receiving and / or sending in the above-mentioned first aspect, and the processing unit is configured to perform other processing operations except receiving and sending in the above-mentioned first aspect.

[0057] In a fifth aspect, a communication device is provided, which is configured to execute the method provided by any of the above aspects or implementations thereof. Specifically, the device may include units and / or modules, such as a processing unit and / or a communication unit, configured to execute the method provided by any of the above aspects or implementations thereof.

[0058] In one implementation, the apparatus is the aforementioned terminal device or network device. When the apparatus is a terminal device or network device, the communication unit may be a transceiver, or an input / output interface, or a communication interface; and the processing unit may be at least one processor.

[0059] Optionally, the transceiver is a transceiver circuit. Optionally, the input / output interface is an input / output circuit.

[0060] In another implementation, the device is a chip, chip system, or circuit used in a terminal device or network device. When the device is a chip, chip system, or circuit used in a terminal device or network device, the communication unit may be an input / output interface, interface circuit, output circuit, input circuit, pin, or related circuit on the chip, chip system, or circuit; and the processing unit may be at least one processor, processing circuit, or logic circuit.

[0061] In a sixth aspect, a communication device is provided, which includes: a memory for storing programs; and at least one processor for executing computer programs or instructions stored in the memory to execute the method provided by any one of the above aspects or its implementation.

[0062] In one implementation, the apparatus is a terminal device or a network device.

[0063] In another implementation, the device is a chip, a chip system or a circuit used in a terminal device or a network device.

[0064] In a seventh aspect, a communication device is provided, comprising: at least one processor and a communication interface, wherein the at least one processor is configured to retrieve a computer program or instruction stored in a memory through the communication interface to execute the method provided by any one of the above aspects or implementations thereof. The communication interface may be implemented in hardware or software.

[0065] In one implementation, the apparatus further includes a memory.

[0066] In an eighth aspect, a processor is provided for executing the methods provided in the above aspects.

[0067] For the operations such as sending and acquiring / receiving involved in the processor, unless otherwise specified, or if they do not conflict with their actual functions or internal logic in the relevant descriptions, they can be understood as operations such as processor output, reception, and input, or as sending and receiving operations performed by the radio frequency circuit and antenna. This application does not limit this.

[0068] In a ninth aspect, a computer-readable storage medium is provided, which stores a program code for execution by a device, wherein the program code includes a method for executing any one of the above aspects or its implementation.

[0069] In a tenth aspect, a computer program product comprising instructions is provided, which, when run on a computer, enables the computer to execute the method provided by any one of the above aspects or its implementation.

[0070] In an eleventh aspect, a chip is provided, comprising a processor and a communication interface, wherein the processor reads instructions stored in a memory through the communication interface and executes the method provided by any of the above aspects or implementations thereof. The communication interface may be implemented in hardware or software.

[0071] Optionally, as an implementation method, the chip also includes a memory, in which a computer program or instruction is stored, and the processor is used to execute the computer program or instruction stored in the memory. When the computer program or instruction is executed, the processor is used to execute the method provided by any of the above aspects or its implementation methods.

[0072] When the method provided in this application is executed by a chip, this application does not limit the number of chips that implement the method. For example, the method can be executed by one chip or by two or more chips. Furthermore, when the number of chips implementing the method of this application is two or more, the chip manufacturers are not limited and can be the same manufacturer or different manufacturers.

[0073] In a twelfth aspect, a computer program is provided, which, when run on a computer, enables the method provided by any one of the above aspects or its implementation to be executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] FIG1 is a schematic diagram of CJT transmission between base stations provided in an embodiment of the present application.

[0075] FIG2 is a system architecture applicable to a transmission method provided in an embodiment of the present application.

[0076] FIG3 is a schematic flow chart of a transmission method provided in an embodiment of the present application.

[0077] FIG4 is a schematic diagram of a transmission method provided in an embodiment of the present application.

[0078] FIG5 is a schematic simulation diagram of a Doppler domain provided in an embodiment of the present application.

[0079] FIG6 is a schematic flowchart of another transmission method provided in an embodiment of the present application.

[0080] FIG7 is a schematic diagram of another transmission method provided in an embodiment of the present application.

[0081] FIG8 is another schematic simulation diagram of the Doppler domain provided in an embodiment of the present application.

[0082] FIG9 is a schematic diagram of a transmission device provided in an embodiment of the present application.

[0083] FIG10 is a schematic diagram of another transmission device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0084] The technical solution in this application will be described below with reference to the accompanying drawings.

[0085] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In this application, "at least one" refers to one or more, and "more than one" refers to two or more. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0086] In the embodiments of this application, prefixes such as "first" and "second" are used only to distinguish different description objects and have no limiting effect on the position, order, priority, quantity, or content of the described objects. The use of prefixes such as ordinal numbers in the embodiments of this application to distinguish description objects does not constitute a limitation on the described objects. For a statement of the described objects, please refer to the description in the context of the claims or embodiments, and the use of such prefixes should not constitute an unnecessary limitation.

[0087] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), world-wide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR), future communication systems (for example, sixth generation (6G) system), etc.

[0088] The terminal device in the embodiments of the present application may refer to a user device, an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user apparatus. The terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a future 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc., and the embodiments of the present application are not limited thereto.

[0089] The network device in the embodiment of the present application may be a device for communicating with a terminal device. The network device may be an evolved NodeB (eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (CRAN) scenario, or the network device may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network, etc., and the embodiment of the present application is not limited thereto.

[0090] CJT is a multi-antenna technology commonly used in wireless communication systems, especially in multi-user, multi-cell systems. The main idea of ​​CJT is to use technologies such as joint transmission and joint scheduling of multiple network devices. For example, when a terminal device is served by multiple network devices, the multiple network devices can use the CJT transmission method to make the signals sent by the multiple network devices to the terminal device coherently superimposed at the terminal device and the interference coherently canceled, thereby improving the received signal to interference and noise ratio (SINR) on the terminal device side, as well as network throughput and user experience.

[0091] Figure 1 shows a schematic diagram of a communication system. Among them, base station (BS) 1, base station 2 and multiple terminal devices (such as UE1 to UE5) form a wireless communication system network. UE1 to UE5 in Figure 1 receive downlink information from network devices (base station 1, base station 2). The downlink information sent by base station 1 and base station 2 may include user data and control information. According to Figure 1, it can be seen that UE1, UE2 and UE5 receive downlink information sent from one base station, and UE3 and UE4 receive downlink information sent from two base stations. Among them, assuming that BS1 and BS2 transmit the same data stream to UE3 through CJT transmission, it can achieve coherent superposition of the received signals at UE3 and coherent cancellation of interference, thereby greatly improving the received SINR and improving network throughput and user experience.

[0092] However, in many scenarios of actual application, different network devices do not share a common clock source. For example, in the IP radio access network (IPRAN) networking scenario in the European market, different base stations do not share a common clock source. Among them, signal processing, sampling, and carrier generation in the signal transmission process are all performed under clock control. Due to the limitation of hardware accuracy, different network devices under the control of different clock sources inevitably have frequency deviations, which leads to the information sent by multiple network devices in the CJT transmission scenario to the same terminal device. There is a phase difference accumulated over time on the terminal device side. The same signals sent by the multiple network devices to the terminal device cannot be coherent in phase, and the CJT transmission effect cannot be guaranteed.

[0093] When multiple network devices use CJT transmission and do not share a common clock source, how can we ensure that these multiple network devices can effectively transmit CJT signals to the same terminal device? The existing technology proposes that in a time division duplex (TDD) system, network devices send pilot signals to each other over the air interface to estimate calibration coefficients. The multiple network devices use the calibration coefficients to compensate for the effects of non-ideal clock synchronization on the transmission and reception channels between the different network devices, thereby compensating for the effects of non-ideal clock synchronization on the multiple network devices. The specific method is as follows:

[0094] Assume that multiple network devices, BS1 and BS2, share a different clock source. At regular intervals, BS1 and BS2 need to exchange pilot symbols s over the air interface to determine a calibration coefficient C.

[0095] For example, the BS1 and BS2 send pilot symbols s to each other at time t0.

[0096] BS1 sends a pilot symbol s to BS2 at time t0. Correspondingly, the pilot received signal of BS2 is:

[0097] BS2 sends a pilot symbol s to BS1 at time t0. Correspondingly, the pilot received signal of BS1 is:

[0098] It should be understood that in the above formula, Δf1 represents the frequency deviation of BS1, and Δf2 represents the frequency deviation of BS2. The frequency deviation is the deviation between the carriers generated by BS1 and BS2 and a standard frequency. The standard frequency can be preconfigured, predefined, or indicated by some indication information, which is not limited in this application.

[0099] It should also be understood that h 1→2 represents the air interface channel from BS1 to BS2, h 2→1 represents the air interface channel from BS2 to BS1. The air interface signals between BS1 and BS2 are reciprocal. 1→2 With h 2→1 equal.

[0100] BS1 and BS2 divide the received signals sent by the pilot signals to each other to obtain the calibration coefficient C, as shown below:

[0101] It should be understood that the calibration coefficient C obtained from the above formula can compensate for the receiving or transmitting channel of BS1 or BS2, thereby ensuring that the synchronization of BS1 or BS2 can be achieved at the calibration time t0.

[0102] For this method, in a TDD system, the uplink air interface transmission channel between BS1 and the terminal device is the same as the downlink air interface transmission channel. For example, the uplink and downlink air interface channels between BS1 and the terminal device are h1, and the uplink and downlink air interface channels between BS2 and the terminal device are h2. The frequency deviations of BS1 and BS2 are Δf1 and Δf2 respectively. That is, the uplink channel from the terminal device to BS1 is The uplink channel from the terminal device to BS2 is The downlink channel from BS1 to the terminal device is The downlink channel from TRP2 to the terminal device is

[0103] During CJT transmission, the terminal device can send an uplink reference signal (UL-RS), such as a sounding reference signal (SRS), at time t1. BS1 and BS2 can estimate the uplink channel from the terminal device to BS1 and the uplink channel from the terminal device to BS2, respectively, based on the SRS sent by the terminal device. Assuming an ideal channel estimation method is used, BS1 estimates the uplink channel based on the SRS as: BS1 estimates the uplink channel based on SRS as Based on the reciprocity of uplink and downlink channels of the TDD system, BS1 and BS2 determine the joint downlink channel from BS1 and BS2 to the terminal device as BS1 and BS2 design joint weights based on the above joint channel Ensure that the transmitted signals are coherently superimposed on the terminal device side, that is, ensure and The phases are the same.

[0104] However, the actual downlink channel of BS1 is The actual downlink channel of BS2 is Assuming that there is no calibration coefficient C between BS1 and BS2, then and The phases of BS1 and BS2 must be different, and it is impossible to guarantee that the signals sent by BS1 and BS2 to the terminal device will be coherently superimposed on the terminal device side. Assume that the calibration coefficients are determined between BS1 and BS2 at time t1. Get the calibration coefficient BS2 uses this calibration factor Supplement the sending channel of BS2. At this time, the signal sent by BS2 to the terminal device is:

[0105] The received signal sent by BS1 to UE is:

[0106] at this time, and The phases of the signals sent by BS1 and BS2 to the terminal device are equal, which can ensure that the signals sent by BS1 and BS2 to the terminal device can be coherently superimposed on the terminal device side, thereby ensuring the effect of CJT transmission from BS1 and BS2 to the terminal device.

[0107] It can be seen that at the calibration moment, by compensating the transceiver channel with the corresponding calibration coefficient, it can be ensured that the downlink signals sent to the terminal device by multiple network devices with different clock sources are coherently superimposed on the terminal device side. However, in the existing method, between two adjacent calibrations, the network device will generally use the calibration coefficient obtained by the previous calibration for compensation. Assuming that the previous calibration was performed at time t0, the calibration coefficient is At this time, the received signal sent by BS2 to the terminal device at time t1 is:

[0108] At this time, the phases of the signals sent by BS1 and BS2 to the terminal device and the received signals at the terminal device are not equal, that is, it cannot be guaranteed that the signals sent by BS1 and BS2 are coherently superimposed on the terminal device side.

[0109] It should be understood that considering the carrier frequency f c =3.5GHz, the frequency deviation Δf1-Δf2 between BS1 and BS2 is 1×10 -10 , then Δf1 - Δf2 = 0.7 Hz. Typically, the period of pilot transmission between network devices is on the order of 3 seconds. Therefore, between two consecutive calibrations, BS1 and BS2 will accumulate a phase difference of 4.2π. This means that the frequency deviation Δf1 - Δf2 ≠ 0 between the BSs will cause a phase difference between the stations to accumulate over time.

[0110] The above analysis shows that to ensure that the coherent superposition characteristic is met at every moment, the calibration coefficient C needs to change over time. However, the mutual transmission of pilot signals between base stations only provides the calibration coefficient C corresponding to a specific calibration moment. Between calibration moments, the calibration coefficient obtained at the previous calibration moment is used for channel compensation. This cannot compensate for the phase difference accumulated over time due to frequency deviation in real time, and therefore cannot meet CJT performance requirements.

[0111] Generally, to address the issues with the existing methods, calibration coefficients corresponding to different times can be obtained by increasing the frequency of pilot transmissions between air interfaces. However, due to the presence of multiple network devices and limited air interface resources, the period of pilot transmissions between any two base stations is limited to seconds. This makes it impossible to obtain calibration coefficients corresponding to different times by increasing the frequency of pilot transmissions between air interfaces.

[0112] Based on the problems existing in the above-mentioned prior art, the present application provides a transmission method, which ensures the CJT transmission effect of multiple network devices sending the same signal to the same terminal device when CJT transmission is performed when multiple network devices do not share a common clock source.

[0113] FIG2 is a system architecture applicable to a transmission method provided in an embodiment of the present application.

[0114] As shown in Figure 2, the network equipment and terminal equipment involved in the embodiments of the present application may include: a radio resource control (RRC) signaling interaction module, a media access control (MAC) signaling interaction module and a physical layer (PHY) signaling interaction module.

[0115] The RRC signaling interaction module can be used to receive or send RRC information to manage and control key parameters and resources related to the wireless network. The MAC signaling interaction module can be used to receive or send MAC-CE signaling to ensure effective communication between network devices and terminal devices. The PHY signaling interaction module can be used to receive or send: uplink / downlink control signaling and uplink / downlink control data, and transmit reference signals, such as the channel state information reference signal (CSI-RS), to measure channel state information (CSI).

[0116] Specifically in the present application, the network device can send RRC signaling to the terminal device, and the RRC signaling can be used to indicate the reference signal resources for correlation measurement of the terminal device, and the PUCCH or PUSCH resources for correlation reporting by the terminal device. The network device can also send a downlink reference signal (for example, CSI-RS) to the terminal device. After the terminal device receives the downlink reference signal sent by the network device, it reports a message indicating the frequency deviation estimate to the network device. The network device receives the message indicating the frequency deviation estimate from the terminal device, and compensates for the frequency deviation between multiple network devices according to the message, or compensates for the phase difference accumulated over time in the signals sent between multiple network devices due to the frequency deviation, thereby ensuring the performance of CJT transmission by the multiple network devices.

[0117] FIG3 is a schematic diagram of a transmission method provided by an embodiment of the present application. The method may include the following steps:

[0118] 301. The terminal device receives M groups of downlink reference signals.

[0119] Wherein, M is a positive integer greater than or equal to 2.

[0120] Exemplarily, the M groups of downlink reference signals come from M network devices, that is, each of the M network devices can send a group of downlink reference signals to the terminal device. As shown in Figure 3, the terminal device receives M groups of downlink reference signals sent from the first network device to the Mth network device.

[0121] Optionally, the downlink reference signal may be a CSI-RS, or other reference signals such as a tracking reference signal (TRS), which is not specifically limited in this application.

[0122] The M groups of downlink reference signals include at least two groups of downlink reference signals.

[0123] Optionally, each group of downlink reference signals in the M groups of downlink reference signals includes at least one downlink reference signal.

[0124] Each group of downlink reference signals in the M groups of downlink reference signals corresponds to a downlink reference signal resource or a downlink reference signal resource set.

[0125] It should be understood that the above-mentioned set of downlink references may correspond to a downlink reference signal resource, which may be a semi-persistent reference signal resource or a periodic reference signal resource. The above-mentioned set of downlink reference signals may also correspond to a downlink reference signal resource set, which may include multiple reference signal resources. The above-mentioned reference signal resources may be aperiodic reference signal resources, or may also be periodic or semi-persistent reference signal resources, which is not limited in this application.

[0126] Exemplarily, the downlink reference signal takes CSI-RS as an example, and the downlink reference signal resource takes CSI-RS resource as an example. A CSI-RS resource (for example, CSI-RS resource #1) configured by the first network device among multiple network devices for the terminal device is a semi-persistent reference signal resource. Among them, the CSI-RS resource configured by the first network device for the terminal device can be configured through CSI-RS resource configuration information, and the CSI-RS resource configuration information can also include the time-frequency resources and the sending period (that is, the sending time interval of two adjacent CSI-RS) of the CSI-RS transmission. The first network device sends a CSI-RS to the terminal device on CSI-RS resource #1. Accordingly, the terminal device periodically receives multiple CSI-RSs from the first network device on CSI-RS#1. In addition, the first network device can indicate a group of L CSI-RSs sent by the first network device to the terminal device through downlink indication information, such as downlink control information (DCI), where L is a positive integer. For example, the first network device is activated or deactivated via DCI. In the activated state, the first network device sends L CSI-RS at equal intervals. Accordingly, the terminal device receives a set of CSI-RS from the first network device based on the reference signal resource (i.e., CSI-RS resource #1) configured by the network device and the DCI information.

[0127] Exemplarily, the downlink reference signal takes CSI-RS as an example, and the downlink reference signal resource takes CSI-RS resource as an example. A CSI-RS resource (e.g., CSI-RS resource #2) configured by the first network device among multiple network devices for the terminal device is a non-periodic reference signal resource. Among them, the first network device can trigger L CSI-RS transmissions at equal intervals through downlink indication information (e.g., DCI). Accordingly, the terminal device receives a group of CSI-RSs sent at equal intervals from the first network device based on the reference signal resources (i.e., CSI-RS resource #1) configured by the network device and the DCI information.

[0128] Exemplarily, a first network device among multiple network devices configures a CSI-RS resource set for a terminal device, and the CSI-RS resource set includes CSI-RS resource #2, CSI-RS resource #3 and CSI-RS resource #5, and the CSI-RS resources in the CSI-RS resource set are non-periodic downlink reference signal resources. The first network device dynamically triggers a CSI-RS resource in the CSI-RS resource set through DCI. For example, the first network device triggers CSI-RS resource #2 twice at equal intervals, triggers CSI-RS resource #3 once, and triggers CSI-RS resource #5 twice at equal intervals through downlink indication information (such as DCI) within a certain time period. Accordingly, the terminal device receives CSI-RS twice on CSI-RS resource #2 at equal intervals, receives CSI-RS once on CSI-RS resource #3, and receives CSI-RS twice on CSI-RS resource #5 at equal intervals on the CSI-RS resources in the CSI-RS resource set according to the DCI information.

[0129] It should be understood that the embodiment of the present application is described by taking the first network device among the M network devices as an example, which does not have a limiting effect.

[0130] 302. The terminal device sends first information.

[0131] For example, the terminal device receives M groups of downlink reference signals, determines first information based on the M groups of downlink reference signals, and sends the first information.

[0132] Exemplarily, the terminal device sends the first information to multiple network devices (e.g., M network devices) participating in the CJT. As shown in FIG3 , the terminal device sends the first information to M network devices (e.g., the first network device to the Mth network device), where the M network devices include all network devices in the CJT transmission.

[0133] The first information is determined based on the M groups of downlink reference signals. The first information may indicate M frequencies or M frequency groups. Each frequency group in the M frequency groups includes P frequencies, where P is a positive integer greater than or equal to 2. When the first information indicates M frequencies or M frequency groups, each frequency in the M frequencies or each frequency group in the M frequency groups is determined by a group of downlink reference signals in the M groups of downlink reference signals.

[0134] The first information may also indicate M-1 frequency differences, where each of the M-1 frequency differences is determined based on two groups of downlink reference signals in the M groups of downlink reference signals. One of the M groups of downlink reference signals is a reference reference signal group. For example, downlink reference signal group #1 is used as the reference reference signal group. Downlink reference signal group #1 is one of the two groups of downlink reference signals used to determine any one of the M-1 frequency differences, and the other of the two groups of downlink reference signals is one of the M-1 groups of downlink reference signals excluding downlink reference signal group #1.

[0135] It should also be understood that the first information indicating M frequencies or M frequency groups, or M-1 frequency differences may be indicated directly or indirectly.

[0136] Among them, the terminal device specifically adopts any one of the following methods 1 or 2 to indicate multiple frequencies, or multiple frequency groups, or at least one frequency difference through the first information, which can be predefined or preconfigured by the system, or indicated by one or more network devices among multiple network devices performing CJT transmission through indication information. This application does not limit this.

[0137] Mode 1: When the first information is indicated in a direct indication manner, that is, the first information includes specific values ​​of the M frequencies, or M frequency groups, or M-1 frequency differences.

[0138] For example, a terminal device receives M groups of downlink reference signals from multiple network devices, and determines M frequencies, or M frequency groups, or M-1 frequency differences based on the M groups of downlink reference signals. The terminal device quantizes specific frequencies among the M frequencies, or M frequency groups, or M-1 frequency differences, and sends the quantized bits of the M frequencies, or M frequency groups, or M-1 frequency differences to the network device.

[0139] Mode 2: When the first information is indicated indirectly, the first information indicates M frequencies or M frequency groups, or M-1 frequency differences by reporting Doppler domain basis indexes or relative indexes.

[0140] It should be understood that M indices indicating M frequencies can be reported through the first information, and each of the M indices is associated with each of the M frequencies. At this time, the network device can determine the frequency associated with the index based on the index indicated by the first information.

[0141] Optionally, the M indexes indicated by the first information are M Doppler domain basis indexes. The M indexes are associated with M groups of downlink reference signals, that is, each of the M indexes is associated with a group of downlink reference signals in the M groups of downlink reference signals.

[0142] It should be understood that M groups of indices may be reported through the first information to indicate M groups of frequencies, where each group of indices includes P indices and is associated with P frequencies in each frequency group.

[0143] Optionally, the M index groups indicated by the first information are M Doppler domain basis index groups. The M index groups are associated with M groups of downlink reference signals, that is, each index group in the M index groups is associated with a group of downlink reference signals in the M groups of downlink reference signals.

[0144] It should be understood that M-1 relative indexes indicating M-1 frequency differences can be reported through the first information, and each relative index in the M-1 relative indexes is associated with each frequency difference in the M-1 frequency differences. At this time, the network device can determine the frequency difference associated with the relative index based on the relative index indicated by the first information.

[0145] As an example, as shown in Figure 4, assume that a terminal device receives two sets of downlink reference signals from two network devices (e.g., BS1 and BS2). Each of the two sets of downlink reference signals includes L downlink reference signals, where L is a positive integer. BS1 corresponds to the first set of downlink reference signals, and BS2 corresponds to the second set of downlink reference signals. The first set of downlink reference signals includes L downlink reference signals transmitted at equal intervals; the second set of downlink reference signals includes L downlink reference signals transmitted at equal intervals.

[0146] The time interval between two adjacent downlink reference signals in the L downlink reference signals in the first group of downlink reference signals is Δt, and the time interval between two adjacent downlink reference signals in the L downlink reference signals in the second group of downlink reference signals is Δt.

[0147] The terminal device receives a first group of downlink reference signals sent from BS1. The first group of downlink reference signals includes L downlink reference signals sent at equal intervals. Taking the lth downlink reference signal of the L downlink reference signals as an example (1≤l≤L), the lth downlink reference signal sent by the terminal device from BS1 can be expressed as:

[0148] in, When the lth downlink reference signal in the first group of downlink reference signals is sent, the air interface channel response between BS1 and the terminal device, s 1,l is the transmission symbol of the lth downlink reference signal sent by BS1, and Δf1 is the frequency deviation introduced by BS1 during downlink transmission.

[0149] The terminal device receives a second group of downlink reference signals sent from BS2. The second group of downlink reference signals includes L downlink reference signals sent at equal intervals. Taking the lth downlink reference signal among the L downlink reference signals as an example (1≤l≤L), the lth downlink reference signal sent by the terminal device from BS2 can be expressed as:

[0150] in, When the lth downlink reference signal in the second group of downlink reference signals is sent, the air interface channel response between BS2 and the terminal device is s 2,l is the transmission symbol of the lth downlink reference signal sent by BS2, and Δf2 is the frequency deviation introduced by BS2 during downlink transmission.

[0151] As shown in FIG4 , the terminal device receives the downlink reference signal Y each time. 1→UE,l or Y 2→UE,l , estimate the corresponding channel or The terminal device receives L downlink reference signals from BS1 and performs L downlink channel estimations. In addition, the terminal device receives L downlink reference signals from BS2 and performs L downlink channel estimations.

[0152] The terminal device performs channel estimation based on the received downlink reference signal, and can use existing channel estimation methods, such as the least square method (LS) and other methods. For details, please refer to the introduction in the relevant literature, and this application will not go into details. In this application, the least square method is used as an example for channel estimation. Combined with the downlink reference signal received by the above terminal device as an example, the terminal device receives the lth downlink reference signal sent by BS1 as For example, the terminal device uses the downlink reference signal Perform downlink channel estimation to obtain: in, Similarly, the downlink reference signal received by the terminal device for the first time from BS2 is For example, the terminal device uses the downlink reference signal Perform downlink channel estimation to obtain: in,

[0153] As shown in Figure 4, the terminal device receives two sets of downlink reference signals sent by BS1 and BS2, and obtains two sets of channel estimation results through channel estimation. The terminal device determines the L channel estimation results based on the L downlink reference signals sent by BS1: Similarly, the terminal device determines the L channel estimation results based on the L downlink reference signals received from BS2: After obtaining the two sets of channel estimation results, the terminal device performs Doppler domain transforms on each of them, thereby representing the channel estimation results in the form of Doppler domain basis weights. Assume that the number of Doppler domain basis components is N, where N ≥ L, and N is a positive integer. When N is greater than L, the terminal device can pad the sequence consisting of the above two sets of channel estimation results with zeros to make the length N. For example, the terminal device pads the end of L channel estimation results with NL zeros to obtain:

[0154] The terminal device can convert the two sets of sequences of length N into the Doppler domain respectively through fast Fourier transform (FFT). At this time, the two sequences of length N can be expressed as the weighted form of the following Doppler domain basis:

[0155] Among them, f0,f1,…,f N-1 are N Doppler domain basis components, each basis component is a column vector of length N, and its subscript k is the index of the basis component. The basis component with index k can be given as follows

[0156] Among them, c 1,0 ,c 1,1 ,…,c 1,N-1 and c 2,0 ,c 2,1 ,…,c 2,N-1 are the weighting coefficients of the above two sequences of length N in the basis of indexes 0, 1, …, N-1, and the above weighting coefficients are all complex numbers.

[0157] The Doppler domain basis in the embodiment of the present application takes the above-mentioned DFT basis as an example, and the DFT basis includes N basis components. Of course, the Doppler basis may also be a basis in other forms, which is not limited in the present application. The Doppler domain basis may be pre-configured by the system or predetermined by the protocol. In addition, the value of the above-mentioned N may be pre-configured by the system, or predetermined by the protocol, or indicated by the network device through indication information. For example, the terminal device receives a first indication information from the network device (such as BS1 and / or BS2), and the first indication information indicates N. Exemplarily, the above-mentioned first indication information may be carried by the RRC signaling CSI reporting configuration (reporting setting), for example, by adding a corresponding field to indicate the value of N in the CSI reporting configuration.

[0158] FIG5 shows the channel estimation obtained by the terminal device based on the two sets of downlink reference signals received from BS1 and BS2, such as downlink reference signals (DL-RS) 1 and DL-RS2 in FIG5. and Schematic diagram of the corresponding Doppler domain weighting coefficient. Where (1) in Figure 5 is the Doppler domain basis weighting coefficient of the channel estimation obtained by the terminal device according to DL-RS1. Each coordinate on the coordinate axis represents the Doppler domain basis index, ranging from 0 to N-1. The height of the arrow on the coordinate reflects the modulus value of the weighting coefficient corresponding to the corresponding Doppler domain basis index. For example, the height of the arrow at index I reflects the Doppler domain basis f with index I. I The corresponding weighting coefficient c 1,I The modulus value of |c 1,I |Size; (2) in Figure 5 is the Doppler domain basis weighting coefficient of the channel estimation obtained by the terminal device according to DL-RS2. The meaning of the Doppler domain basis weighting coefficient is similar to the meaning of the Doppler domain basis weighting coefficient of the channel estimation obtained by the terminal device according to DL-RS1 in Figure 5 (1) above, and will not be repeated here.

[0159] It should be noted that each Doppler domain base number I is associated with a frequency The specific correlation relationship is shown in formula (1):

[0160] Wherein, Δt is the time interval for transmitting L downlink reference signals in each group of downlink reference signals in the multiple M groups of downlink reference signals, Indicates that the frequency estimate is .

[0161] Considering that the frequency interval corresponding to two adjacent Doppler domain basis indices is If the time interval Δt between two adjacent downlink reference signals in a group of downlink reference signals is 10 ms, and the number of Doppler domain basis components is N=2048, then the frequency interval that can distinguish two adjacent Doppler domain basis indexes is 0.049 Hz.

[0162] In Example 1, the terminal device determines a frequency based on each of the M groups of downlink reference signals received, and determines a total of M frequencies. The terminal device sends first information to indicate the above-determined M frequencies. In conjunction with the specific examples in Figures 4 and 5, the terminal device receives M=2 groups of downlink reference signals, and obtains two groups of Doppler domain basis weighting coefficients c after channel estimation and Doppler domain transformation. 1,0 ,c 1,1 ,…,c 1,N-1 and c 2,0 ,c 2,1 ,…,c 2,N-1 The terminal device can select the Doppler domain basis index corresponding to the weighting coefficient with the largest modulus value in the above two sets of weighting coefficients, which can be expressed as: I1 = argmin 0≤i≤N-1 |c 1,i I² = argmin 0≤i≤N-1 |c 1,2 |

[0163] The terminal device reports the frequencies associated with I1 and I2 to the network device through the first information. and Correspondingly, the network device can obtain the frequencies corresponding to indexes I1 and I2 according to the above formula (1). and With reference to the example in FIG5 , I1 and I2 are 5 and 8 respectively.

[0164] It should be understood that the first information is used to indicate the above and The following methods can be used to indicate: One method is for the terminal equipment to and Quantify and report through the first information and The corresponding quantization bits are similar to the above method 1; another method is that the terminal device reports the Doppler basis index I1 and I2. In the method of reporting the Doppler domain basis index, one possible implementation method is to use The binary form of the Doppler domain basis index is reported using 8 bits. As an example, assuming N is 256, an index can be reported using 8 bits. Combined with the example in FIG5 , indexes I1=5 and I2=8 can be reported using 8 bits 00000101 and 00001010, respectively. The first information includes 00000101 and 00000101.

[0165] Example 2: The terminal device determines a frequency group based on each of the M groups of downlink reference signals received, and determines a total of M frequency groups, where each frequency group contains P frequencies, and the terminal device indicates the above M frequency groups through the first information.

[0166] In conjunction with the specific examples in FIG4 and FIG5, the terminal device receives M=2 groups of downlink reference signals, and obtains two groups of Doppler domain basis weighting coefficients c after channel estimation and Doppler domain transformation respectively. 1,0 ,c 1,1 ,…,c 1,N-1 and c 2,0 ,c 2,1 ,…,c 2,N-1 The terminal device can select the Doppler domain basis index corresponding to the P weighting coefficients with the largest modulus values ​​from the above two groups of weighting coefficients, and obtain two index groups, namely index group #1:I 1,0 ,I 1,1 ,…,I 1,P-1 ; Index group #2: I 2,0 ,I 2,1 ,…,I 2,P-1 The terminal device reports two frequency groups associated with index group #1 and index group #2 through the first information, namely frequency group #1: And frequency group #2: Accordingly, the network device may determine the P frequencies associated with the P indexes included in each index group according to the above formula (1).

[0167] It should be understood that the size of P frequencies included in each of the above two frequency groups can be pre-configured by the system, predetermined by the protocol, or indicated by the network device through indication information. For example, the terminal device receives third indication information from the network device (such as BS1 and / or BS2), and the third indication information indicates the P. Exemplarily, the above third indication information can be carried by the RRC signaling CSI reporting configuration (reporting setting), for example, the network device can add a corresponding field indicating the value of P in the CSI reporting configuration. Accordingly, the terminal device receives the third indication information from the network device, and determines the number of frequencies included in a frequency group indicated by the first information based on the P indicated by the third indication information.

[0168] It should also be understood that, in combination with the examples in Figures 4 and 5 above, assuming that the third indication information indicates P=6, the terminal device determines 6 frequencies based on each of the 2 groups of downlink reference signals received, and determines 2 frequency groups in total, where each frequency group includes 5 frequencies. The terminal device sends the first information to indicate the 2 frequency groups determined above. The terminal device receives M=2 groups of downlink reference signals, and obtains two groups of Doppler domain basis weighting coefficients c after channel estimation and Doppler domain transformation respectively. 1,0 ,c 1,1 ,…,c 1,N-1 and c 2,0 ,c 2,1 ,…,c 2,N-1 The terminal device can select the Doppler domain basis index corresponding to the six weighting coefficients with the largest modulus values ​​from the above two groups of weighting coefficients. The six Doppler domain basis indexes in the Doppler domain basis shown in (1) of Figure 5 are 2, 3, 5, 6, 8, and 10, respectively. The six Doppler domain basis indexes in the Doppler domain basis shown in (2) of Figure 5 are 2, 5, 6, 8, 9, and 11, for example.

[0169] The terminal device reports the frequencies associated with "2, 3, 5, 6, 8, 10" and "2, 5, 6, 8, 9, 11" to the network device through the first information. and Correspondingly, the network device can obtain the frequencies corresponding to the indexes "2, 3, 5, 6, 8, 10" and "2, 5, 6, 8, 9, 11" according to the above formula (1). and

[0170] It should be understood that the first information is used to indicate the above and This can be indicated in the following ways: One way is to and Quantify them separately and report them through the first information and The corresponding quantization bits are similar to the above method 1; another method is to report the Doppler basis index "2,3,5,6,8,10" and "2,5,6,8,9,11". In the method of reporting the Doppler domain basis index, one possible implementation method is to use The binary form of the Doppler domain basis index is reported using 8 bits. As an example, assuming N is 256, an index can be reported using 8 bits. Based on the example in Figure 5, indices 2, 3, 5, 6, 8, and 10 can be reported using 8 bits: 00000010; 00000011; 00000101; 00000110; 00001000; 00001010, respectively; and indices 2, 5, 6, 8, 9, and 11 can be reported using 8 bits: 00000010; 00000101; 00000110; 00001000; 00001001; 00001011, respectively. Here, the first information includes 00000010, 00000011, 00000101, 00000110, 00001000, 00001010; 00000010, 00000101, 00000110, 00001000, 00001001, 00001011.

[0171] It should be understood that the above example introduces a method of reporting in binary form a total of M*P indexes in M ​​index groups. The P indexes corresponding to each index group in the above M index groups can also be indicated by a bitmap. Assume that the index groups to be reported are I0, I1, ..., I P-1 , the above index groups are arranged in ascending order. At this time, the terminal device can report the minimum index I0 and the maximum index I in the index group. P-1 , the minimum index and maximum index can be directly reported in binary form, I0 and I P-1 The P-2 indexes between them can be reported in the form of a bitmap, which contains a total of I P-1 -I0-1 bits, corresponding to I0 and I P-1 The common I P-1 - Whether the 10-1 indexes are included in the index group that needs to be reported, for example, by setting the corresponding bit in the bitmap to 1 to indicate that the corresponding index is included in the index group. Taking the reporting of the index group "0, 2, 5, 8, 10" as an example, the first information includes the minimum index 0 and the maximum index 10 in the index group. Here, a bitmap containing 9 bits is used to indicate whether indexes 1 to 9 are included in the index group that needs to be reported. Here, the bitmap is "010010010" to indicate that indexes "2, 5, 8" are included in the index group that needs to be reported.

[0172] In the method of reporting index groups, in addition to reporting the index, the weight coefficient corresponding to the index can also be reported. For example, the index group I0, I1, ..., I P-1 The corresponding weighting coefficient The first information needs to include the weighting coefficient The quantization bits of the amplitude and phase of each weighting coefficient in .

[0173] In Example 3, a terminal device determines a total of M-1 frequency differences based on M groups of received downlink reference signals. Each of the M-1 frequency differences is determined by two groups of downlink reference signals from the M groups of downlink reference signals, where one group of the M groups of downlink reference signals is a reference reference signal group. For example, downlink reference signal group #1 is used as the reference reference signal group. Downlink reference signal group #1 is one of the two groups of downlink reference signals used to determine any one of the M-1 frequency differences, and the other of the two groups of downlink reference signals is one of the M-1 groups of downlink reference signals excluding downlink reference signal group #1.

[0174] It should be understood that which specific group of downlink reference signals in the above-mentioned M groups of downlink reference signals serves as the reference reference signal group may be indicated by the network device through indication information. For example, the terminal device receives a second indication information from the network device (such as BS1 and / or BS2), and the second indication information is used to indicate that one group of downlink reference signals in the M groups of downlink reference signals (such as downlink reference signal group #1) is the reference parameter signal. Exemplarily, the above-mentioned second indication information may be carried by RRC signaling CSI reporting configuration (reporting setting), for example, by adding a corresponding field in the CSI reporting configuration to indicate the resource identification information ID of the downlink reference signal group used as a reference. The second indication information may also be carried by RRC signaling reference signal resource configuration (resource setting), for example, by adding a corresponding field in the reference signal resource configuration corresponding to the downlink reference signal group used as a reference, indicating that the group of downlink reference signals serves as the reference reference signal group. Accordingly, the terminal device determines that the downlink reference signal group #1 is the reference parameter signal according to the second indication information.

[0175] In conjunction with the specific examples in Figures 4 and 5, the terminal device receives M = 2 groups of downlink reference signals. In Figure 4, a group of DL-RS1 corresponding to BS1 is used as the reference reference signal group. The terminal device receives two groups of downlink reference signals, and after performing channel estimation and Doppler domain transformation respectively, obtains two groups of Doppler domain basis weighting coefficients c 1,0 ,c 1,1 ,…,c 1,N-1 and c 2,0 ,c 2,1 ,…,c 2,N-1 The terminal device can select the Doppler domain base index corresponding to the weighted coefficient with the largest modulus value in the above two sets of weighted coefficients, that is, I1 = argmin 0≤i≤N-1 |c 1,i I² = argmin 0≤i≤N-1 |c1,2 |

[0176] The terminal device can obtain the frequency corresponding to the index I1 according to the above formula (1) The frequency corresponding to I2 The terminal device indicates the frequency difference through the first information

[0177] It should be understood that the first information is used to indicate the above Δf 21 It can be indicated in the following ways: One way is that the terminal device is 21 Quantify and report Δf through the first information 21 The corresponding quantization bits are similar to the above method 1; another method is that the terminal device converts the frequency difference Δf 21 Converted to relative index ΔI 21 The specific method is as follows: According to the index I1 and I2 given by formula (1) and the frequency and The relationship between the frequency difference can be deduced and relative index ΔI 21 relationship satisfaction where the relative index ΔI 21 It can be determined according to formula (2):

[0178] As an example, in combination with the specific examples in Figures 4 and 5 above, DL-RS1 is used as the reference reference signal, and I1=5 and I2=8 are determined according to DL-RS1 and DL-RS2 respectively. If N=256, the first information is used to indicate the relative index ΔI 21 , the relative index ΔI 21 It is 3 (8-5=3).

[0179] As another example, the terminal device receives three groups of downlink reference signals from three network devices, such as BS1, BS2 and BS3 for CJT transmission. If BS1, BS2 and BS3 send three groups of downlink reference signals, such as DL-RS1, DL-RS2 and DL-RS3, and DL-RS1 is used as the reference downlink reference signal, N is 256. The Doppler domain basis index determined by the terminal device based on DL-RS1 is I1=5, the Doppler domain basis index determined based on DL-RS2 is I2=8, and the Doppler domain basis index determined based on DL-RS2 is I3=251. DL-RS1 is the reference downlink reference signal, and the first information is used to indicate the relative index ΔI 21 =I2-I1=2, and ΔI 31 =I3-I1=-8.

[0180] It should be understood that when the first information indicates a relative index, one possible implementation method is to Bit indicates relative index, the above The first bit of the bits is used to indicate the positive or negative sign of the relative index. For example, if the first bit is 0, it indicates that the difference is positive; if the first bit is 1, it indicates that the difference is negative. This application does not limit the value of the first bit.

[0181] As an example, assuming that N is 256, 9 bits in the first information can be used to indicate the relative index, then the above ΔI 21 =I2-I1=2, and ΔI 31 =I3-I1=-8. The two relative indexes can be indicated by 9 bits 00000010 and 10001000 respectively.

[0182] It should be understood that the above description is made by taking the DL-RS1 corresponding to BS1 as the reference downlink reference signal as an example, wherein the reference downlink reference signal may be pre-configured by the system, or predetermined by the protocol, or indicated by the network device through indication information. For example, the terminal device receives second indication information from the network device (e.g., BS1, and / or BS2, and / or BS3), and the second indication information indicates a group of downlink reference signals (e.g., DL-RS1) in multiple groups of downlink reference signals. For example, the terminal device receives second indication information from the network device (e.g., BS1 and / or BS2), and the second indication information is used to indicate that a group of downlink reference signals in the M groups of downlink reference signals is a reference parameter signal. Exemplarily, the second indication information may be carried by RRC signaling CSI reporting configuration, for example, adding a corresponding field in the CSI reporting configuration to indicate the resource ID of the downlink reference signal group used as a reference. The second indication information may also be carried by RRC signaling reference signal resource configuration, for example, adding a corresponding field in the reference signal resource configuration corresponding to the downlink reference signal group used as a reference to indicate that the group of downlink reference signals is used as a reference. Correspondingly, the terminal device determines, based on the second indication information, a group of downlink reference signals among the M groups of downlink reference signals as the reference parameter signal.

[0183] The method shown in FIG3 may further include the following steps:

[0184] 303. The first network device performs frequency deviation compensation according to the first information.

[0185] It should be understood that after receiving the first information from the terminal device, multiple network devices participating in CJT (e.g., the M network devices shown in Figure 3) compensate for the frequency deviation caused by the different clock sources between the network devices based on the first information, thereby improving the performance of downlink CJT transmission between the multiple network devices and the terminal device. As shown in Figure 3, the first through M network devices receive the first information from the terminal device and perform frequency deviation compensation based on the first information.

[0186] As an example, the first information is used to indicate M frequencies, where the M frequencies correspond to the frequency deviation estimation values ​​Δf1 to Δf from the first network device to the Mth network device as shown in FIG3 . M If the terminal device uses M Doppler domain basis indices to indicate M frequencies, that is, the first information includes M Doppler domain basis indices I1~I M The network device can use the above formula (1) and the M Doppler domain basis indexes I1 to I2 included in the first information. M Determine the frequency deviation Δf1~Δf M The M network devices can directly compensate their carrier frequencies. For example, the second to M-th network devices use the frequency deviation of the first network device as a reference, and the compensation frequencies determined by them can be expressed as: Δf1-Δf2, ..., Δf1-Δf M For another example, the second network device to the Mth network device use the first network device as a reference device to compensate for the phase difference accumulated over time due to different frequency deviations between different network devices.

[0187] As another example, the first information is used to indicate M-1 frequency differences. Assuming that the downlink reference signal group sent by the first network device is used as the reference reference signal, the M-1 frequency differences indicated by the first information correspond to the relative values ​​of the frequency deviations of the second network device to the M-th network device and the first network device as shown in Figure 3, which can be expressed as: Δf2-Δf1, Δf3-Δf1, ..., Δf M -Δf1. For example, the terminal device uses M-1 relative indexes to indicate M-1 frequency differences, that is, the first information includes M-1 relative indexes ΔI 21 , ΔI 31 ,…,ΔI M1 , the network device can determine the relationship between the relative frequency deviation and relative index between network devices through the following formula (3):

[0188] Based on the method shown in Figure 3, a terminal device receives multiple sets of downlink reference signals from multiple network devices and sends first information to the multiple network devices. This first information is used to assist the multiple network devices in compensating for frequency deviations caused by different clock sources, thereby improving the coherent addition effect of signals sent by multiple network devices to the same terminal device at the terminal device, thereby improving CJT transmission performance.

[0189] It should be understood that based on the method shown in FIG3 above, if the terminal device is further considered, the multiple frequencies indicated by the first information reported by the terminal device to multiple network devices will all include the Doppler frequency generated by the movement of the terminal device. At this time, the Doppler frequency is comparable to the frequency deviation between the network devices, or even the Doppler frequency is greater than the frequency deviation between the network devices. If only the frequency indicated by the first information reported by the terminal device is used, it is impossible to distinguish between the Doppler domain frequency generated by the movement of the terminal device and the frequency deviation between the network devices. In order to estimate the frequency deviation between network devices in a scenario where the user is moving, an embodiment of the present application provides another transmission method, as shown in FIG6:

[0190] 601. M network devices send M groups of downlink reference signals to the terminal device.

[0191] Accordingly, the terminal device receives M groups of downlink reference signals.

[0192] It should be understood that step 601 is similar to the above step 301. For detailed description, please refer to the detailed description of the above step 301, which will not be repeated here.

[0193] 602. The terminal device sends the first information.

[0194] For example, the terminal device receives M groups of downlink reference signals, determines first information based on the M groups of downlink reference signals, and sends the first information, where M is a positive integer greater than or equal to 2.

[0195] Exemplarily, the terminal device sends the first information to M network devices participating in the CJT, such as the first network device to the Mth network device in FIG6 .

[0196] It should be understood that the first information can be used to indicate M frequencies, M frequency groups or M-1 frequency differences, and its determination method and indication manner are similar to those in the above step 302. For details, please refer to the detailed introduction in the above step 302.

[0197] It should be noted that each frequency indicated by the first information in step 602 includes the Doppler frequency generated by the movement of the terminal device and the frequency deviation of the network device. For example, the first network device determines the first frequency based on the first information, and the first frequency can be expressed as: f D +Δf, where fD represents the Doppler frequency of the channel between the first network device and the terminal device; Δf represents the frequency deviation estimation value of the first network device.

[0198] In order to enable the first network device to accurately obtain its own frequency deviation estimated value Δf, the method shown in FIG6 may further include:

[0199] 603. The terminal device sends a set of uplink reference signals to M network devices.

[0200] Accordingly, the M network devices receive the group of uplink reference signals from the terminal device.

[0201] Optionally, the group of uplink reference signals includes at least one uplink reference signal.

[0202] Exemplarily, the group of uplink reference signals is sent to M network devices, i.e., each network device receives the group of uplink reference signals from the terminal device. Figure 6 shows that M network devices (e.g., the first network device to the M-1th network device) respectively receive the group of uplink reference signals from the terminal device.

[0203] It should be understood that the set of uplink reference signals sent by the terminal device to the M network devices is similar to the M sets of downlink reference signals sent by the M network devices to the terminal device in step 601. For example, as shown in FIG7 , assuming that the terminal device receives two sets of downlink reference signals from two network devices (e.g., BS1 and BS2), the terminal device needs to send one set of downlink reference signals to BS1 and BS2. At the same time, the number of uplink reference signals in the set of uplink reference signals may be the same as or different from the number of each set of downlink reference signals in the M sets of downlink reference signals, and this application does not impose any limitation thereon.

[0204] It should also be understood that a group of uplink reference signals sent by the terminal device to M network devices may specifically be multiple reference signals sent by the terminal device to M network devices at equal intervals. The multiple reference signals sent at equal intervals are called the group of uplink reference signals.

[0205] 604. The first network device determines a second frequency according to a group of uplink reference signals.

[0206] It should be understood that the embodiment of the present application is described by taking the first network device among the M network devices participating in CJT as an example. The method is also applicable to other network devices among the M network devices participating in CJT, and this application will not elaborate on them one by one.

[0207] For example, the terminal device sends a group of uplink reference signals to M network devices, and each of the M network devices receives a group of uplink reference signals sent by the terminal device. For example, the first network device receives a group of uplink reference signals from the terminal device, and the first network device determines the second frequency based on the group of uplink reference signals. The method for the first network device to determine the second frequency based on the group of uplink reference signals is similar to the method for the terminal device to determine the first frequency in the first information based on a group of downlink reference signals introduced in the above step 602. Please refer to the detailed introduction in step 302 in Figure 3 above. The group of uplink reference signals received by the first network device includes L uplink reference signals, and the network device performs channel estimation on the uplink channel based on the L uplink reference signals, converts the L channel estimation results into the Doppler domain through FFT, and determines the second frequency based on the above Doppler domain transformation.

[0208] Among them, the second frequency can be expressed as f D -Δf.

[0209] It should be understood that the above steps 601 and 602 can be performed after steps 603 and 604, or steps 603 and 604 can be performed after steps 601 and 602, and this application does not limit this.

[0210] 605 : The first network device determines a frequency deviation Δf according to the first frequency and the second frequency in the first information.

[0211] In one possible implementation, the first network device determines the first frequency f according to the first information in step 602. 1 =f D +Δf, and the second frequency f determined in step 604 2 =f D -Δf, determines the frequency deviation estimate, which satisfy:

[0212] It should be understood that the first frequency and the second frequency can also be calculated by other methods or rules to determine the frequency deviation estimate. This application will not go into details one by one.

[0213] It should also be understood that the frequency deviation estimate determined by the first network device according to the first frequency and the second frequency The transmission frequency is determined to ensure that when other network devices in the multiple network devices of CJT transmission transmit the same data to the terminal device, the same data transmitted by the multiple network devices of CJT transmission to the terminal device can be coherently superimposed on the terminal device side, interference is offset, and the transmission performance of CJT is improved.

[0214] According to the method shown in Figure 6 above, considering that the frequency indicated by the first information determined by the terminal device based on multiple groups of downlink reference signals (for example, the first frequency) includes the Doppler frequency generated by the movement of the terminal device and the frequency deviation estimation value of the first network device relative to multiple network devices transmitted by CJT, after the first network device side receives the first information, it is impossible to distinguish the Doppler frequency generated by the movement of the terminal device in the first frequency and the frequency deviation estimation value corresponding to the first network device, that is, in the method provided in the present application, a group of uplink reference signals are sent to the first network device by the terminal device, and the first network device determines the second frequency based on the received group of uplink reference information, and eliminates the Doppler frequency generated by the movement of the terminal device in the frequency according to the first frequency and the second frequency, thereby obtaining the frequency deviation estimation value between the first network device and other network devices transmitted by CJT.

[0215] It should be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between the various embodiments are consistent and can be referenced by each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0216] The embodiments of the present application also provide an apparatus for implementing any of the above methods, and the apparatus includes a unit corresponding to executing each step in implementing any of the above methods.

[0217] Figure 9 is a schematic diagram of a transmission device 900 provided in an embodiment of the present application. The device 900 may include a receiving unit 910, a sending unit 920, and a processing unit 930. The receiving unit 910 is used to receive instructions and / or data, and the sending unit 920 is used to send instructions and / or data. The receiving unit 910 and the sending unit 920 may also be referred to as communication interfaces, communication units, or transceiver units. The processing unit 930 is used to perform data processing to enable the device 900 to implement the aforementioned channel information transmission method.

[0218] Optionally, the device 900 further includes a storage unit for implementing a corresponding storage function and storing corresponding instructions and / or data.

[0219] As a design, the device 900 can perform the actions performed by any terminal device in the above method embodiments.

[0220] In one possible implementation, the device 900 includes: a receiving unit 910 and a sending unit 920; the receiving unit 910 is used to receive multiple groups of downlink reference signals, each group of downlink reference signals in the multiple groups of downlink reference signals corresponds to a downlink reference signal resource or a downlink reference signal resource set; the sending unit 920 is used to send first information, the first information is determined based on the multiple groups of downlink reference signals, the first information is used to indicate multiple frequencies or multiple frequency groups, each frequency in the multiple frequencies or each frequency group in the multiple frequency groups is determined by a group of downlink reference signals in the multiple groups of downlink reference signals, or the first information is used to indicate at least one frequency difference, each frequency difference in the at least one frequency difference is determined by two groups of downlink reference signals in the multiple groups of downlink reference signals, wherein each frequency group includes multiple frequencies.

[0221] In another possible implementation, the apparatus 900 includes: a receiving unit 910, a sending unit 920 and a processing unit 930; the sending unit 920 is used to send a group of first downlink reference signals, where the group of first downlink reference signals belongs to a group of downlink reference signals in multiple groups of downlink reference signals, and each group of downlink reference signals in the multiple groups of downlink reference information corresponds to a downlink reference signal resource or a downlink reference signal resource set; the receiving unit 910 is also used to receive first information from a terminal device, where the first information is determined based on multiple groups of downlink reference signals, and the first information is used to indicate multiple frequencies or multiple frequency groups, where each frequency in the multiple frequencies or each frequency group in the multiple frequency groups is determined by a group of downlink reference signals in the multiple groups of downlink reference signals, or the first information is used to indicate at least one frequency difference, where each frequency difference in the at least one frequency difference is determined by two groups of downlink reference signals in the multiple groups of downlink reference signals; the processing unit 930 is used to determine a transmission frequency based on the first information, and the transmission frequency is used for downlink signal transmission between the network device and the terminal device.

[0222] The receiving unit 910 is further configured to perform other receiving-related operations in the above-mentioned embodiments (e.g., FIG. 3 and FIG. 6 ). The sending unit 920 is further configured to perform other sending-related operations in the above-mentioned embodiments (e.g., FIG. 3 and FIG. 6 ). The transmission device further includes a processing unit 930, which is configured to perform other processing operations in addition to receiving and sending in the above-mentioned embodiments.

[0223] FIG10 is a schematic diagram of another channel information transmission device 1000 provided in an embodiment of the present application.

[0224] The device 1000 includes a memory 1010, a processor 1020, and a communication interface 1030. The memory 1010, processor 1020, and communication interface 1030 are connected via an internal connection path. The memory 1010 is used to store instructions, and the processor 1020 is used to execute the instructions stored in the memory 1010 to control the communication interface 1030 to obtain information or enable the device 1000 to implement the aforementioned channel information transmission method. Optionally, the memory 1010 can be coupled to the processor 1020 via an interface or integrated with the processor 1020.

[0225] It should be noted that the communication interface 1030 may be a transceiver such as, but not limited to, a transceiver. The communication interface 1030 may also include an input / output interface.

[0226] The processor 1020 stores one or more computer programs, which include instructions. When the instructions are executed by the processor 1020, the apparatus 1000 executes the channel information transmission method in each of the above embodiments.

[0227] During implementation, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor 1020 or by instructions in the form of software. The method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 1010, and the processor 1020 reads the information in the memory 1010 and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

[0228] Optionally, the communication interface 1030 in FIG. 10 may implement the receiving unit 910 and the sending unit 920 in FIG. 9 , and the processor 1020 in FIG. 10 may implement the processing unit 930 in FIG. 9 .

[0229] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a program code. When the computer program code is executed on a computer, the computer executes any one of the methods in FIG. 1 to FIG. 8 .

[0230] An embodiment of the present application further provides a computer program product, which includes a computer program. When the computer program is executed, the computer executes any one of the methods in Figures 1 to 8 above.

[0231] An embodiment of the present application further provides a chip, comprising: a circuit, wherein the circuit is used to execute any one of the methods in FIG. 1 to FIG. 8 above.

[0232] An embodiment of the present application also provides a terminal device, including any one of the transmission devices in Figure 9 or Figure 10.

[0233] An embodiment of the present application also provides a network device, including any one of the transmission devices in Figure 9 or Figure 10.

[0234] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0235] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0236] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0237] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0238] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0239] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0240] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A transmission method, characterized in that: include: receiving a plurality of groups of downlink reference signals, each group of downlink reference signals in the plurality of groups of downlink reference signals corresponding to a downlink reference signal resource or a downlink reference signal resource set; Send first information, where the first information is determined based on the multiple groups of downlink reference signals, the first information is used to indicate multiple frequencies or multiple frequency groups, each frequency in the multiple frequencies or each frequency group in the multiple frequency groups is determined by a group of downlink reference signals in the multiple groups of downlink reference signals, and each frequency group includes P frequencies, where P is a positive integer greater than or equal to 2; or, the first information is used to indicate at least one frequency difference, and each frequency difference in the at least one frequency difference is determined by two groups of downlink reference signals in the multiple groups of downlink reference signals.

2. The method according to claim 1, characterized in that Each group of downlink reference signals in the multiple groups of downlink reference signals includes at least one downlink reference signal.

3. The method according to claim 1 or 2, characterized in that The first information is used to indicate a plurality of indexes, where each index in the plurality of indexes is associated with each frequency in the plurality of frequencies, or each index in the plurality of indexes is associated with P frequencies included in each frequency group in the plurality of frequency groups.

4. The method according to claim 3, characterized in that The multiple indexes are multiple Doppler domain basis indexes, and the Doppler domain basis is associated with a group of downlink reference signals in the multiple groups of downlink signals.

5. The method according to claim 4, characterized in that The Doppler domain basis is a discrete Fourier transform DFT basis. The Doppler domain basis includes N basis components, where N is a positive integer.

6. The method according to claim 5, characterized in that The method further comprises: First indication information is received, where the first indication information is used to indicate the N.

7. The method according to any one of claims 3 to 6, characterized in that One of the multiple indexes is an index corresponding to a basis component having a maximum modulus value of a weighting coefficient associated with one of the multiple Doppler domain bases.

8. The method according to any one of claims 3 to 6, characterized in that The multiple indexes include multiple index groups, and each index group in the multiple index groups includes P indexes corresponding to P basis components with the largest modulus of weighting coefficients associated with a Doppler domain basis among the multiple Doppler domain basis.

9. The method according to any one of claims 1 to 8, characterized in that The method further comprises: Second indication information is received, where the second indication information is used to indicate that one group of downlink reference signals among the multiple groups of downlink reference signals is a reference parameter signal, and the two groups of downlink reference signals include the reference reference signal.

10. The method according to any one of claims 1 to 9, characterized in that The method further comprises: Receive third indication information, where the third indication information is used for the P.

11. The method according to any one of claims 3 to 10, characterized in that The first information includes bits are used to indicate one index among the multiple indexes.

12. The method according to any one of claims 4 to 11, characterized in that The first information includes bits are used to indicate the relative index between two indexes in the multiple indexes, One of the bits is used to indicate the sign of the relative index. The other bits in the bits are used to indicate the size of the relative index.

13. A transmission method, characterized in that: include: Sending a group of first downlink reference signals, where the group of first downlink reference signals belongs to a group of downlink reference signals among multiple groups of downlink reference signals, and each group of downlink reference signals in the multiple groups of downlink reference signals corresponds to a downlink reference signal resource or a downlink reference signal resource set; receiving first information from a terminal device, where the first information is determined based on the multiple groups of downlink reference signals, the first information being used to indicate multiple frequencies or multiple frequency groups, each frequency in the multiple frequencies or each frequency group in the multiple frequency groups being determined by a group of downlink reference signals in the multiple groups of downlink reference signals, each frequency group including P frequencies, where P is a positive integer greater than or equal to 2, or the first information being used to indicate at least one frequency difference, where each frequency difference in the at least one frequency difference is determined by two groups of downlink reference signals in the multiple groups of downlink reference signals; A transmission frequency is determined based on the first information, where the transmission frequency is used for downlink signal transmission with the terminal device.

14. The method according to claim 13, characterized in that Each group of downlink reference signals in the multiple groups of downlink reference signals includes at least one downlink reference signal.

15. The method according to claim 13 or 14, characterized in that The first information is used to indicate a plurality of indexes, where each index in the plurality of indexes is associated with each frequency in the plurality of frequencies, or each index in the plurality of indexes is associated with P frequencies included in each frequency group in the plurality of frequency groups.

16. The method according to claim 15, characterized in that The multiple indexes are multiple Doppler domain basis indexes, and the Doppler domain basis is associated with a group of downlink reference signals in the multiple groups of downlink reference signals.

17. The method according to claim 16, characterized in that The Doppler domain basis is a DFT basis. The Doppler domain basis includes N basis components, where N is a positive integer.

18. The method according to claim 17, characterized in that The method further comprises: Send first indication information, where the first indication information is used to indicate the N.

19. The method according to any one of claims 15 to 18, characterized in that One of the multiple indexes is an index corresponding to a basis component having a maximum modulus value of a weighting coefficient associated with one of the multiple Doppler domain bases.

20. The method according to any one of claims 15 to 18, characterized in that The multiple indexes include multiple index groups, and each index group in the multiple index groups includes P indexes corresponding to P basis components with the largest modulus of weighting coefficients associated with a Doppler domain basis among the multiple Doppler domain basis.

21. The method according to any one of claims 13 to 20, characterized in that The method further comprises: Second indication information is sent, where the second indication information is used to indicate that one group of downlink reference signals among the multiple groups of downlink reference signals is a reference reference signal, and the two groups of downlink reference signals include the reference reference signal.

22. The method according to any one of claims 13 to 21, characterized in that The method further comprises: Send third indication information, where the third indication information is used to indicate the P.

23. The method according to any one of claims 15 to 22, characterized in that The first information includes bits are used to indicate one index among the multiple indexes.

24. The method according to any one of claims 16 to 23, characterized in that The first information includes bits are used to indicate the relative index between two indexes in the multiple indexes, One of the bits is used to indicate the sign of the relative index. The other bits in the bits are used to indicate the size of the relative index.

25. The method according to any one of claims 13 to 24, characterized in that The determining the transmission frequency according to the first information includes: determining a frequency deviation estimate based on the first information; Perform frequency deviation compensation according to the frequency deviation estimate, The frequency deviation estimation value is determined based on the transmission time interval of the group of first downlink reference signals, the N and an index among the multiple indexes.

26. The method according to claim 25, characterized in that The frequency deviation estimate satisfies: in, represents a frequency deviation estimation value, Δt represents the transmission time interval, and I represents an index among the multiple indexes.

27. A communication device, characterized in that: include: A processor, coupled to a memory, configured to read and execute instructions in the memory to perform the method according to any one of claims 1 to 12, or the method according to any one of claims 13 to 26.

28. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a program code, and when the computer program code is run on a computer, the computer is caused to perform the method according to any one of claims 1 to 12 or the method according to any one of claims 13 to 26.

29. A chip, characterized in that: include: processor and interface circuit; wherein, The interface circuit is used to receive code instructions and transmit them to the processor; The processor is configured to execute the code instructions to perform the method according to any one of claims 1 to 12, or the method according to any one of claims 13 to 26.

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