Signal transmission method, storage medium and electronic device

Abstract

Embodiments of the present disclosure provide a signal transmission method, a storage medium and an electronic device. The method comprises: a base station performs air interface channel calibration on a plurality of TRPs, so as to align downlink transmission phases of the plurality of TRPs; and the base station transmits a signal to a terminal by completing coherent joint transmission of the plurality of TRPs that have undergone the air interface channel calibration.

Description

Signal transmission method, storage medium and electronic device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application CN 202311818053.X filed on December 25, 2023, entitled “Signal Transmission Method, Storage Medium and Electronic Device”, and claims the priority of the patent application, and all the disclosed contents thereof are incorporated into this application by reference. Technical Field

[0003] The embodiments of the present disclosure relate to the field of communications, and in particular, to a signal sending method, a storage medium, and an electronic device. Background Art

[0004] With the continuous evolution of mobile communication networks, network cells are showing a trend of shrinking coverage radius and denser site deployment, resulting in an increasingly prominent problem of co-channel interference. Users in overlapping coverage areas of co-channel cells experience a significant drop in service performance due to co-channel interference from neighboring cells, seriously affecting their service experience. How to meet users' increasingly demanding service demands in scenarios where overlapping network coverage areas are becoming increasingly dense has become a major issue that urgently needs to be focused on and broken through in current communication networks. Currently, the most similar technologies include cell merging and coordinated multi-point (CoMP) collaboration, but both suffer from poor network performance and low user service rates.

[0005] Summary of the Invention

[0006] According to one embodiment of the present disclosure, a signal sending method is provided, including: a base station performs air interface channel calibration on multiple transmitting and receiving points TRP to align the downlink transmission phases of the multiple TRPs; the base station sends the signal to the terminal by coherently jointly sending the multiple TRPs that have completed the air interface channel calibration.

[0007] According to another embodiment of the present disclosure, a computer-readable storage medium is provided, in which a computer program is stored. The computer program is configured to execute the steps of any one of the above method embodiments when running.

[0008] According to another embodiment of the present disclosure, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to perform the steps in any one of the above method embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a hardware structure block diagram of a computer terminal of a signal sending method according to an embodiment of the present disclosure;

[0010] FIG2 is a structural block diagram of a network architecture of a signal transmission method according to an embodiment of the present disclosure;

[0011] FIG3 is a structural block diagram of a network architecture of a signal transmission method according to an embodiment of the present disclosure;

[0012] FIG4 is a flowchart of a signal sending method according to an embodiment of the present disclosure;

[0013] FIG5 is a flowchart of a signal sending method according to an embodiment of the present disclosure;

[0014] FIG6 is a structural block diagram of a signal sending device according to an embodiment of the present disclosure;

[0015] FIG7 is a schematic diagram showing the principle of a first air interface channel calibration method according to an embodiment of the present disclosure;

[0016] FIG8 is a schematic diagram showing the principle of a second air interface channel calibration method according to an embodiment of the present disclosure;

[0017] FIG9 is a structural block diagram of an air interface channel calibration device according to an embodiment of the present disclosure;

[0018] FIG10 is a schematic diagram of the signal interaction principle of air interface channel calibration according to an embodiment of the present disclosure;

[0019] FIG11 is a schematic diagram of a signal transmission principle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0020] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings and in combination with embodiments.

[0021] It should be noted that the terms "first", "second", etc. in the description and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0022] Cell merging combines multiple consecutive co-frequency neighboring cells into a single logically large cell, eliminating interference and improving signal strength through frequency-domain scheduling and joint transmission (JT). However, merging multiple cell resources into a single cell reduces network user capacity and cell throughput, and is limited in its inability to support joint transmission based on uplink channel sounding reference signal (SRS) beamforming, resulting in certain performance limitations. The later adopted CoMP collaborative technology overcomes the issues of reduced user capacity and cell throughput associated with cell merging. However, CoMP coordinated scheduling (CS) and coordinated beamforming (CBF) rely on frequency-domain resource coordination and beam-domain coordination to mitigate frequency-domain interference and spatial signal interference. This technology has the drawback of only avoiding interference, while the coordinated cells do not jointly transmit signals, resulting in signal amplification and underutilization of frequency-domain resources. Although CoMP JT technology achieves joint signal transmission, due to differences in the location distribution and hardware consistency of the RF devices used for joint transmission, the downlink joint transmission signals cannot be superimposed in the same direction or even cancel each other out in the opposite direction, resulting in a bottleneck in which the network performance gain is not obvious.

[0023] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking operation on a computer terminal as an example, FIG1 is a hardware structure block diagram of a computer terminal of a signal sending method of an embodiment of the present disclosure. As shown in FIG1 , the computer terminal may include one or more (only one is shown in FIG1 ) processors 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the above-mentioned computer terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It will be understood by those skilled in the art that the structure shown in FIG1 is only for illustration and does not limit the structure of the above-mentioned computer terminal. For example, the computer terminal may also include more or fewer components than those shown in FIG1 , or have a configuration different from that shown in FIG1 .

[0024] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the signal transmission method in the embodiment of the present disclosure. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, implementing the above-mentioned method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include a memory remotely located relative to the processor 102, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0025] The transmission device 106 is used to receive or transmit data via a network. A specific example of the aforementioned network may include a wireless network provided by a communications provider of a computer terminal. In one embodiment, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to enable communication with the Internet. In another embodiment, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0026] The embodiment of the present application can run on the network architecture shown in Figure 2 or Figure 3. As shown in Figure 2 or Figure 3, the network architecture includes: multiple (at least two) co-frequency transmission and reception points (Transmission Receive Point, TRP) and terminals. Among them, as shown in Figure 2, multiple TRPs belong to multiple cells, and antenna calibration (Antenna Calibration) is performed between multiple TRPs, and then coherent joint transmission (Coherent Joint Transmission) signals are sent to the terminal. The terminal accesses from one TRP and receives coherent downlink signals from multiple coordinated TRPs. As shown in Figure 3, multiple TRPs belong to the same merged cell, and antenna calibration is performed between multiple TRPs, and then signals are jointly sent to the terminal. The terminal accesses from one TRP and receives coherent downlink signals from multiple coordinated TRPs.

[0027] In this embodiment, a signal transmission method running on the above-mentioned computer terminal or network architecture is provided. FIG4 is a flow chart of the signal transmission method according to an embodiment of the present disclosure. As shown in FIG4 , the flow chart includes the following steps:

[0028] Step S402: The base station performs air interface channel calibration on multiple TRPs to align downlink transmission phases of the multiple TRPs.

[0029] During actual implementation, the above-mentioned multiple TRPs can be located in the same base station or in multiple different base stations.

[0030] In step S404, the base station sends a signal to the terminal by coherently jointly sending multiple TRPs that have completed air interface channel calibration.

[0031] In an exemplary embodiment, before the base station performs air interface channel calibration on multiple TRPs, it also includes: the base station determines multiple coherently coordinated TRPs based on the measurement report of the terminal.

[0032] In an exemplary embodiment, before the base station performs air interface channel calibration on multiple TRPs, it also includes: the base station configures functional parameters according to the multiple TRPs, wherein the functional parameters include at least one of the following: multi-point coherent collaboration functional parameters; air interface channel calibration functional parameters.

[0033] FIG5 is a flow chart of a signal transmission method according to an embodiment of the present disclosure. As shown in FIG5 , the flow includes the following steps:

[0034] Step S502: The base station determines a plurality of coherently coordinated TRPs based on the measurement report of the terminal;

[0035] In an exemplary embodiment, the base station determines multiple coherently coordinated TRPs based on the measurement report of the terminal, including: when the multiple TRPs are located in different service cells, the base station receives an A3 measurement report from the terminal; the base station determines multiple coherently coordinated TRPs based on the A3 measurement report and the frequency domain resource conditions of each TRP.

[0036] In an exemplary embodiment, the base station determines multiple coherently coordinated TRPs based on the measurement report of the terminal, and also includes: when the multiple TRPs are located in the same service cell, the base station receives an uplink channel measurement report from the terminal; the base station determines multiple coherently coordinated TRPs based on the uplink channel measurement report.

[0037] During the actual implementation process, the terminal performs channel measurement according to the above different situations and sends the measurement report to the base station. The base station selects and confirms multiple TRPs for collaboration based on the measurement report, then performs channel calibration and sends them jointly to the terminal.

[0038] Step S504: The base station configures function parameters according to the multiple TRPs, wherein the function parameters include at least one of the following: multi-point coherent coordination function parameters; air interface channel calibration function parameters;

[0039] In actual implementation, the above configuration process can be completed by the base station, or by an upper-layer control system or communication system of the base station, and the final configuration result is reflected in the base station.

[0040] Step S506: The base station performs air interface channel calibration on the multiple TRPs to align the downlink transmission phases of the multiple TRPs.

[0041] In an exemplary embodiment, the base station performs air interface channel calibration on multiple TRPs, including: the base station sends calibration signals to each other through multiple TRPs to obtain a channel estimation result for each TRP; the base station determines a calibration compensation value of the TRP to be calibrated based on the channel estimation result, wherein the multiple TRPs include a reference TRP and a TRP to be calibrated; the base station performs air interface channel calibration on the TRP to be calibrated based on the calibration compensation value.

[0042] In actual implementation, for multiple TRPs, such as TRP0, TRP1 and TRP2, TRP1 and TRP2 can be directly compensated and aligned with TRP0, or TRP1 can be directly compensated and aligned with TRP0, and TRP2 can be indirectly compensated and aligned with TRP0 through TRP1.

[0043] In an exemplary embodiment, the base station performs air interface channel calibration on the TRP to be calibrated based on the calibration compensation value, including: the base station obtains an air interface channel calibration signal based on the calibration compensation value; the base station sends the air interface channel calibration signal to the TRP to be calibrated through a guard period (GP).

[0044] In actual implementation, to ensure that the calibration signal does not affect the normal transmission and reception of service signals of network equipment, the calibration signal transmission and reception time is placed on the protection period GP symbol, that is, the calibration signal is sent and received in the GP symbol, thereby avoiding the uplink and downlink symbol signals.

[0045] In step S508, the base station sends the signal to the terminal by coherently sending multiple TRPs that have completed air interface channel calibration.

[0046] In an exemplary embodiment, the base station sends a signal to the terminal by coherently jointly sending multiple TRPs that complete air interface channel calibration, including: the base station configures the signal parameters of the signal to be sent according to the channel detection reference signal SRS of multiple TRPs; the base station sends the signal with completed signal parameter configuration to the terminal through multiple TRPs.

[0047] The above steps provide a signal transmission method in which a base station performs air interface channel calibration on multiple TRPs to align the downlink transmission phases of the multiple TRPs. The base station then transmits the signal to the terminal through coherent joint transmission of the multiple TRPs that have completed the air interface channel calibration. This method solves the problem of poor network performance and low user service rates caused by co-channel interference in related technologies, thereby improving network performance of signal transmission and user service rates.

[0048] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus the necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the embodiment of the present disclosure is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD-ROM), including a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the method described in the embodiment of the present disclosure.

[0049] In this embodiment, a signal transmission device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments. The details already described will not be repeated here. As used below, the term "module" can refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0050] The signal sending device provided by the embodiment of the present disclosure can be arranged in a base station, and includes: a measurement module, a parameter module, a calibration module, and a sending module, wherein the measurement module is used to determine a plurality of coherently coordinated TRPs based on the measurement report of the terminal. The parameter module is used to configure functional parameters based on a plurality of TRPs, wherein the functional parameters include at least one of the following: multi-point coherent collaboration functional parameters; air interface channel calibration functional parameters. The calibration module is used to perform air interface channel calibration on a plurality of TRPs to align the downlink transmission phases of the plurality of TRPs. The sending module is used to send a signal to the terminal by coherently jointly sending a plurality of TRPs that have completed the air interface channel calibration.

[0051] It should be noted that each of the above modules can be implemented through software or hardware. For the latter, implementation can be achieved through, but not limited to, the following methods: all of the above modules are located in the same processor; or, the above modules are located in different processors in any combination. In actual implementation, the naming method and functional division of the above modules can be determined according to actual circumstances, as long as they can implement the signal transmission method of the embodiment of the disclosure, and will not be detailed here.

[0052] An embodiment of the present disclosure further provides a computer-readable storage medium, in which a computer program is stored. The computer program is configured to execute the steps of any one of the above method embodiments when running.

[0053] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk, or an optical disk.

[0054] An embodiment of the present disclosure further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0055] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0056] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail here.

[0057] Obviously, those skilled in the art should understand that the modules or steps of the above-mentioned embodiments of the present disclosure can be implemented using a general-purpose computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented using program codes executable by the computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be performed in a different order than herein, or they can be made into individual integrated circuit modules, or multiple modules or steps can be made into a single integrated circuit module for implementation. Thus, the embodiments of the present disclosure are not limited to any specific combination of hardware and software.

[0058] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, they are described below in conjunction with different embodiments.

[0059] Example 1

[0060] In an embodiment of the present disclosure, a signal sending device is provided. FIG6 is a structural block diagram of the signal sending device according to an embodiment of the present disclosure. As shown in FIG6 , it includes: a system configuration module, a channel calibration module, and a multi-point coordinated joint sending module. Among them, the system configuration module: configures the parameters of the multi-point coherent collaborative function and the air interface calibration function, and sends them to the base station device. The channel calibration module: for the coherently collaborative base station network equipment, completes the calibration of the antenna channel between the base station devices to ensure the consistency of the downlink transmission phase between the base station devices. The multi-point coordinated joint sending module: for the edge user measurement and judgment of the collaborative neighboring area or TRP, and completes the decision of the edge user (terminal) to jointly send between the collaborative cells or TRPs, and completes the multi-point coherent joint sending function of the signal to the user terminal.

[0061] In the embodiment of the present disclosure, the function of the above-mentioned system configuration module may correspond to the parameter module in the above-mentioned embodiment, the above-mentioned channel calibration module may correspond to the calibration module in the above-mentioned embodiment, and the above-mentioned multi-point coordinated joint transmission module may correspond to the transmission module in the above-mentioned embodiment.

[0062] According to the above-mentioned signal sending device, in an embodiment of the present disclosure, a signal sending method is provided, comprising the following steps:

[0063] Step S702: configure the network cells or TRP clusters that require collaboration, and set the functional parameters of the air interface channel calibration of the collaborative cells or TRP clusters.

[0064] In actual implementation, the above configuration process can be completed by the base station or by the base station's upper-layer control system or communication system, and the final configuration result is reflected in the base station. Multiple TRPs are the aforementioned TRP clusters, and multiple TRPs can be located in the same base station or different base stations. Different base stations can be located in different network cells, or in the same network cell. TRPs in multiple different network cells perform collaborative coherent transmission, which is the aforementioned collaborative cell.

[0065] Step S704: Execute the channel calibration function between the radio frequency devices of the coordinated cell or TRP cluster to complete the alignment of the radio frequency transmission phase compensation between the radio frequency devices.

[0066] In actual implementation, the above calibration process is completed by the base station.

[0067] Step S706: Perform cooperative cell or TRP measurement selection for edge users, determine whether the signal transmission conditions are met during the signal transmission processing, and complete the signal transmission processing.

[0068] Taking multi-cell coordination as an example, step S706 includes the following steps:

[0069] A1. The edge user (terminal) triggers A3 measurement, selects a collaborative cell suitable for collaboration based on the A3 measurement results and frequency domain resource conditions, and measures SRS in the serving cell TRP and the collaborative cell TRP for collaborative scheduling judgment.

[0070] In the actual implementation process, the order of the steps for SRS measurement in the serving cell TRP and the coordinated cell TRP can be before the air interface channel calibration or before the joint signal transmission, because the measurement results of SRS are used for coordinated scheduling, and coordinated scheduling occurs when the base station sends the signal to the terminal through the coherent joint transmission of multiple TRPs that have completed the air interface channel calibration.

[0071] In the actual implementation process, the SRS measurement is completed and the results are used to make specific decisions on coordinated scheduling in the next step. For example, the SRS measurement will obtain the power values ​​of the terminal in the local cell and the coordinated neighboring cell. Coordinated scheduling can only be performed if the power value difference meets the threshold condition.

[0072] In the actual implementation process, the collaborative cell suitable for collaboration is selected based on the A3 measurement results and frequency domain resource conditions. The specific selection conditions are as follows: a preset signal value threshold or frequency domain resource threshold is set according to the actual situation. For example, when the difference between the signal value measured by the terminal in the accessed cell and the signal value in a certain neighboring cell is within a certain threshold value, and the remaining frequency domain resources of the neighboring cell also meet a certain threshold condition, it is considered that the neighboring cell can collaborate. No specific restrictions are made here.

[0073] A2. Edge users determine whether downlink services can be jointly transmitted based on the power and delay differences between collaborative TRPs.

[0074] In the actual implementation process, the above-mentioned power difference and delay difference between collaborative TRPs are used to determine whether the downlink service can be collaboratively sent. The power threshold or delay difference threshold can be set according to the actual situation. When the threshold is met, it is determined that the downlink service can be collaboratively sent. The setting of the threshold is determined according to the actual situation and no specific restrictions are made here.

[0075] A3. Determine the transmission configuration for the edge users in the coordinated joint transmission, and jointly send the downlink data signals to the air interface according to their respective SRS weights.

[0076] In the actual implementation process, the above-mentioned configuration for determining the sending of edge users of collaborative joint transmission and jointly sending the downlink data signal to the air interface according to their respective SRS weights is completed by the base station, wherein the configuration for determining the sending of edge users of collaborative joint transmission is to configure the signal parameters of the signal to be sent, and then send it after the configuration is completed. The configuration content may include frequency domain, time domain, number of layers, modulation method, etc., and no specific restrictions are made here.

[0077] Taking the coordination between multiple TRPs in the same cell as an example, the specific processing steps include the following steps:

[0078] B1. The base station device selects the appropriate TRP as the collaborative TRP for edge users based on the uplink channel measurement results between multiple TRPs, and completes the processing and judgment of user collaborative scheduling.

[0079] B2. Determine the transmission configuration for the edge users in the coordinated joint transmission, and jointly send the downlink data signals to the air interface according to their respective SRS weights.

[0080] During the actual implementation process, in step S606, the terminal performs channel measurement according to the above-mentioned different situations and sends the measurement report to the base station. The base station selects and confirms multiple TRPs for collaboration based on the measurement report, then performs channel calibration and sends them jointly to the terminal. During the actual implementation process, the execution order of the above-mentioned step S606 can be adjusted according to the actual situation. In one embodiment, before performing the joint transmission, the terminal can also perform channel measurement according to different situations to determine whether the downlink service can be collaboratively transmitted.

[0081] Example 2

[0082] In the second embodiment, the detailed implementation process of the steps in the first embodiment is introduced and explained.

[0083] FIG7 is a schematic diagram of the principle of the air interface channel calibration method 1 according to an embodiment of the present disclosure. As shown in FIG7, the channel calibration between different RF devices, namely TRPs, does not rely on the terminal device. The calibration signal is sent to each other by the antennas between the RF devices to obtain the channel estimation result H. The interval between the mutual calibration signals is required to be very short to ensure the reciprocity consistency of the air interface channel. The calibration compensation value ΔC between the devices is obtained by determining the transmit and receive response ratio between the two antennas of the two TRPs based on the channel estimation results. Taking the reference device TRP0 as an example, the non-reference devices TRP1 and TRP2 are aligned to the reference device according to the calibration topology compensation. As shown in FIG7, TRP1 and TRP2 are directly compensated and aligned with TRP0 in the topology.

[0084] FIG8 is a schematic diagram of the principle of the second air interface channel calibration method according to an embodiment of the present disclosure. As shown in FIG8 , in the topology, TRP1 is directly compensated and aligned with TRP0, and TRP2 is indirectly compensated and aligned with TRP0 through TRP1.

[0085] In actual implementation, the compensation value is applied to the downlink transmission time-frequency data on TRP1 and TRP2 devices, achieving downlink transmission phase alignment between TRP0, TRP1, and TRP2 devices. The communication principle in related technologies applies the compensation value to the downlink transmission time-frequency data. Downlink signals have signal weights, which are used to adjust the signal's phase and azimuth, ultimately controlling the direction and phase of the data carried by the signal.

[0086] To ensure that the calibration signal does not affect the normal transmission and reception of service signals of network equipment, the calibration signal transmission and reception time is placed on the guard period GP symbol, that is, the calibration signal is sent and received in the GP symbol, thereby avoiding the uplink and downlink symbol signals.

[0087] Figure 9 is a structural block diagram of an air interface channel calibration device according to an embodiment of the present disclosure. As shown in Figure 9, the air interface channel calibration device includes: a calibration sending module, a calibration receiving module, and a calibration calculation and compensation module. The calibration sending module is responsible for generating a calibration signal and completing the air interface transmission of the sequence at a set timing; the calibration receiving module is responsible for receiving the calibration signal at a set timing and decoding and demodulating the calibration signal; the calibration calculation and compensation module calculates the time-frequency domain compensation value between the device channels through the decoded measurement signal, that is, the above-mentioned channel estimation signal, and completes the correct compensation of the compensation value on the device channel.

[0088] During actual implementation, the above-mentioned air interface channel calibration device can be set in a base station.

[0089] Figure 10 is a schematic diagram of the signal interaction principle of air interface channel calibration according to an embodiment of the present disclosure. As shown in Figure 10, the first network (i.e., the first sending and receiving point network or the first TRP) determines the network set (i.e., the TRP set) that needs to collaborate to perform air interface channel calibration, and sends a synchronous calibration notification control message to each receiving point network, wherein the synchronous calibration notification control message is a software message between base stations. First, the first network sends a calibration signal in sequence, the second network synchronously receives the measurement signal, and forwards the measurement signal to the first network. Then, the second network sends a calibration signal in sequence, the first network receives the measurement signal, and the first network converts and calculates the two measurement signals to obtain a compensation value between the two networks. If the first network is used as the benchmark, the compensation value is sent to the second network, and the compensation is completed on the second network. In the actual implementation process, the above description is not limited to two networks, and can be extended to the third network or the Nth network.

[0090] According to the above-mentioned device or signal interaction process for air interface channel calibration, in the second embodiment of this scenario, a detailed signal transmission process is provided. FIG11 is a schematic diagram of the signal transmission principle according to the embodiment of the present disclosure. As shown in FIG11, after the terminal accesses the first network, it starts measurement and reports the measurement results to the first sending and receiving point network. The first sending and receiving point network determines the cooperative network of the user (the second sending and receiving point network) based on the measurement results, and sends a synchronization message to the second sending and receiving point network. The first sending and receiving point network and the second sending and receiving point network measure the uplink reference signal of the terminal. The second sending and receiving point network sends the demodulated measurement signal to the first sending and receiving point network. The first sending and receiving point network determines whether the conditions for downlink joint transmission are met based on the measurement information. If so, the synchronization information for joint transmission is sent to the second sending and receiving point network, notifying the second sending and receiving point network to jointly transmit downlink signals. Finally, the first sending and receiving point network and the second sending and receiving point network synchronously send downlink data signals to the terminal, and the terminal receives the coherent jointly transmitted signal.

[0091] In summary, the embodiments of the present disclosure provide a signal sending method, which is mainly used in the networking scenarios of the Time Division Duplexing (TDD) New Radio (NR) and the distributed scale networking of the future sixth generation (6G) network. After the air interface antenna is jointly calibrated between two or more same-frequency network devices with the same antenna or different antenna units, the downlink edge users are collaboratively coherently jointly shaped based on SRS beamforming (Beam Forming, abbreviated as BF) to achieve the same-phase superposition effect of the downlink signal received by the terminal. The difference in the downlink service rate of different edges of the terminal in the same cell can be used as the entrance. If the rate perception is significantly improved in the cell overlapping area, it can be further detected whether the GP symbol has a periodic signal to confirm whether the technical solution provided by the embodiments of the present disclosure is adopted.

[0092] The disclosed embodiments provide a signal transmission method that performs coherent joint transmission based on joint calibration of air-interface antennas, and implements joint transmission between terminal downlink service cells through multi-point collaboration technology, thereby converting interference signals into useful signals and improving received signal strength. Because the RF transmission points for joint transmission are distributed at different physical locations and the coordinated hardware channels have consistency differences, phase differences in the signals received by the terminal can result, which can easily lead to performance degradation. Therefore, the disclosed embodiments perform joint calibration of the coordinated RF channels on the air-interface antennas to reduce the phase difference between the RF channels, ensure that the signals received by the terminal have the effect of in-phase superposition, achieve the purpose of signal power enhancement, and improve the user's service rate performance.

[0093] The above description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will appreciate that various modifications and variations of the present disclosure are possible. Any modifications, equivalent substitutions, or improvements made within the principles of the present disclosure should be included within the scope of protection of the present disclosure.

Claims

1. A signal transmission method, comprising: The base station calibrates the radio air interface channels of multiple transmit-receive points (TRPs) to align the downlink transmission phases of the multiple TRPs; The base station transmits a signal to a terminal through coherent joint transmission of the multiple TRPs that have completed radio air interface channel calibration.

2. The method according to claim 1, wherein, Before the base station calibrates the radio air interface channels of multiple transmit-receive points (TRPs), the method further comprises: The base station determines multiple TRPs for coherent cooperation according to the measurement report of the terminal.

3. The method according to claim 2, wherein, The base station determines multiple TRPs for coherent cooperation according to the measurement report of the terminal, including: When the multiple TRPs are located in different serving cells, the base station receives an A3 measurement report from the terminal; The base station determines multiple TRPs for coherent cooperation according to the A3 measurement report and the frequency domain resource conditions of each TRP.

4. The method according to claim 2, wherein The base station determines multiple TRPs for coherent cooperation according to the measurement report of the terminal, further comprising: When the multiple TRPs are located in the same serving cell, the base station receives an uplink channel measurement report from the terminal; The base station determines multiple TRPs for coherent cooperation according to the uplink channel measurement report.

5. The method according to claim 1, wherein The base station calibrates the radio air interface channels of multiple transmit-receive points (TRPs), including: The base station obtains the channel estimation result of each TRP by mutually transmitting calibration signals through the multiple TRPs; The base station determines the calibration compensation value of the TRP to be calibrated according to the channel estimation result, where the multiple TRPs include a reference TRP and the TRP to be calibrated; The base station calibrates the radio air interface channel of the TRP to be calibrated according to the calibration compensation value.

6. The method according to claim 5, wherein, The base station calibrates the radio air interface channel of the TRP to be calibrated according to the calibration compensation value, including: The base station obtains a radio air interface channel calibration signal according to the calibration compensation value; The base station sends the radio air interface channel calibration signal to the TRP to be calibrated through a guard period (GP).

7. The method according to claim 1, wherein The base station transmits a signal to a terminal through coherent joint transmission of the multiple TRPs that have completed radio air interface channel calibration, including: The base station configures the signal parameters of the signal to be transmitted according to the channel sounding reference signals (SRSs) of the multiple TRPs; Parameter configuration; The base station sends the signal with the signal parameters configured through the multiple TRPs to the terminal.

8. The method according to claim 1, wherein Before the base station calibrates the radio air interface channels of multiple transmit-receive points (TRPs), the method further comprises: The base station configures functional parameters according to the multiple TRPs, where the functional parameters at least include one of the following: multi-point coherent cooperation functional parameters; radio air interface channel calibration functional parameters.

9. A computer-readable storage medium storing a computer program therein, wherein, When the computer program is executed by a processor, the method described in any one of claims 1 to 8 is implemented.

10. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, where when the processor executes the computer program, the method described in any one of claims 1 to 8 is implemented.

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