Method for transmitting sounding reference signal (srs) and electronic device

Abstract

The embodiment of the application is suitable for the technical field of terminal equipment, and provides a sending method of a channel sounding reference signal (SRS) and an electronic device. The method is applied to a terminal equipment, the terminal equipment is in communication connection with a network equipment, the terminal equipment comprises a first channel and a second channel, the first channel comprises a first uplink channel and a first downlink channel, the second channel comprises a second uplink channel and a second downlink channel, the first uplink channel and the first downlink channel are switched with each other through a first switch, the second uplink channel and the second downlink channel are switched with each other through a second switch, and the method comprises the following steps: sending the SRS by using a first sending power on the first uplink channel, obtaining a first parameter and a second parameter, determining a second sending power according to the first parameter, the second parameter and the first sending power, and sending the SRS by using the second sending power on the second uplink channel, so that the accuracy of channel estimation between the network equipment and the terminal equipment obtained by the network equipment can be improved.

Description

Technical Field

[0001] This application relates to the field of terminal equipment technology, and more specifically, to a method and electronic device for transmitting a channel sounding reference signal (SRS). Background Technology

[0002] When communication occurs between network devices and terminal devices, the network device typically needs to obtain a channel estimate of the downlink channel between the network device and the terminal device. Based on this downlink channel estimate, the network device then determines its output power for communication with the terminal device. The more accurate the determined output power, the better the communication quality between the network device and the terminal device.

[0003] Due to the reciprocity between uplink and downlink channels, network devices typically obtain downlink channel estimates based on the Sounding Reference Signal (SRS) transmitted by terminal devices via the uplink channel. The uplink channel consists of two parts: the uplink channel between the network device and the terminal device, and the uplink channel within the terminal device. Similarly, the downlink channel consists of two parts: the downlink channel between the network device and the terminal device, and the downlink channel within the terminal device. However, since a terminal device usually contains multiple uplink channels, and these channels differ, as do the uplink and downlink channels within the terminal device, the downlink channel estimates obtained by the network device based on the SRS transmitted by the terminal device are inaccurate.

[0004] Therefore, improving the accuracy of downlink channel estimation between network devices and terminal devices has become an urgent problem to be solved. Summary of the Invention

[0005] This application provides a method for transmitting a channel sounding reference signal (SRS), which can improve the accuracy of channel estimation for downlink channels between network devices and terminal devices.

[0006] In a first aspect, a method for transmitting a Channel Sounding Reference Signal (SRS) is provided. This method is applied to a terminal device, which communicates with a network device. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel, and the second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched between each other via a first switch, and the second uplink channel and the second downlink channel are switched between each other via a second switch. The terminal device transmits the SRS through either the first uplink channel or the second uplink channel. The SRS serves as a reference signal for the network device to determine the channel estimation between the network device and the terminal device. The method includes:

[0007] The SRS is transmitted using the first transmit power in the first uplink channel. The first transmit power refers to the preset transmit power when the terminal device transmits the SRS.

[0008] Obtain the first parameter and the second parameter, where the first parameter is used to indicate the insertion loss of the first downlink channel and the second parameter is used to indicate the insertion loss of the second downlink channel;

[0009] The second transmission power is determined based on the first parameter, the second parameter, and the first transmission power. The second transmission power refers to the transmission power of the terminal device when transmitting SRS through the second uplink channel.

[0010] The SRS is transmitted using the second transmit power on the second uplink channel.

[0011] The SRS transmission method provided in the embodiments of this application is applied to a terminal device, wherein the terminal device and a network device are connected in a communication connection. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel, and the second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched to each other by a first switch, and the second uplink channel and the second downlink channel are switched to each other by a second switch. The terminal device transmits SRS through the first uplink channel and the second uplink channel. The SRS is a reference signal for the network device to determine the channel estimation between the network device and the terminal device. The method includes: transmitting SRS in the first uplink channel using a first transmit power, where the first transmit power refers to a preset transmit power when the terminal device transmits SRS; and obtaining a first parameter and a second parameter, wherein the first parameter is used to indicate the insertion loss of the first downlink channel. The second parameter is used to indicate the insertion loss of the second downlink channel. Based on the first parameter, the second parameter, and the first transmit power, the second transmit power is determined. The second transmit power refers to the transmit power of the terminal device when transmitting SRS through the second uplink channel. When transmitting SRS using the second transmit power in the second uplink channel, the signal power of the SRS received by the network device differs due to the varying insertion losses between different uplink channels. In the embodiments of this application, the transmit power corresponding to the second uplink channel is adjusted by using the first parameter indicating the insertion loss of the first uplink channel and the second parameter indicating the insertion loss of the second uplink channel. This reduces the impact of differences between different channels on the channel estimation obtained by the network device for the downlink channel, thereby improving the accuracy of the channel estimation between the network device and the terminal device obtained by the network device transmitting SRS based on different uplink channels.

[0012] In one embodiment, when the SRS is transmitted through the first uplink channel, the switch of the second switch is in a state indicating that the second downlink channel is on.

[0013] The SRS transmission method provided in the embodiments of this application ensures that when the SRS is transmitted through the first uplink channel, the second switch is in the downlink channel's on state. This avoids the situation where the antenna corresponding to the second downlink channel senses the SRS transmitted through the first uplink channel and radiates it out again through the antenna corresponding to the second downlink channel, interfering with the SRS transmitted through the first uplink channel. This ensures that there is no significant difference between the SRS transmitted through the first uplink channel and the second uplink channel, which is equivalent to improving the reciprocity between the first uplink channel and the first downlink channel. This, in turn, improves the accuracy of the channel estimation between the network device and the terminal device obtained by the network device based on the SRS transmitted through the first uplink channel.

[0014] In one embodiment, when the SRS is transmitted through the second uplink channel, the switch of the first switch is in a state indicating that the first downlink channel is on.

[0015] The SRS transmission method provided in the embodiments of this application ensures that when the SRS is transmitted through the second uplink channel, the first switch is in the state where the downlink channel is in the conducting state. This avoids the situation where the antenna corresponding to the first downlink channel senses the SRS transmitted through the second uplink channel and radiates it out again through the antenna corresponding to the first downlink channel, thus interfering with the transmission of the SRS through the second uplink channel. This is equivalent to improving the reciprocity between the second uplink channel and the second downlink channel, thereby improving the accuracy of the channel estimation between the network device and the terminal device obtained by the network device based on the SRS transmitted through the second uplink channel.

[0016] In one embodiment, determining the second transmission power based on the first parameter, the second parameter, and the first transmission power includes: obtaining the difference between the first parameter and the second parameter; and obtaining the second transmission power based on the difference and the first transmission power.

[0017] In one embodiment, obtaining a second transmit power based on the difference and a first transmit power includes: obtaining the maximum transmit power corresponding to the second uplink channel; adjusting the first transmit power based on the difference to obtain a third transmit power; and obtaining the second transmit power based on the third transmit power and the maximum transmit power.

[0018] In one embodiment, obtaining the second transmission power based on the third transmission power and the maximum transmission power includes: when the third transmission power is greater than the maximum transmission power, the second transmission power is the maximum transmission power; when the third transmission power is less than or equal to the maximum transmission power, the second transmission power is the third transmission power.

[0019] The SRS transmission method provided in the embodiments of this application obtains the difference between the first parameter and the second parameter, and corrects the preset transmission power based on the difference between the first parameter and the second parameter to obtain the third transmission power. Then, the smaller transmission power is selected from the maximum transmission power on each channel and the third transmission power of each channel as the second transmission power of the uplink channel. This ensures that the determined second transmission power of the second uplink channel not only improves the accuracy of the channel estimation of the downlink channel determined by the network device, but also that the determined second transmission power is less than or equal to the maximum transmission power. Therefore, transmitting SRS will not damage the electronic components in the terminal device.

[0020] In one embodiment, the first parameter includes the sensitivity of the first downlink channel.

[0021] In the embodiments of this application, the first parameter includes the sensitivity of the first downlink channel, and the second transmit power obtained based on the first parameter, the second parameter, and the first transmit power enables the network device to obtain a more accurate channel estimate of the downlink channel based on the SRS transmitted by different uplink channels on the terminal device.

[0022] In one embodiment, the second parameter includes the sensitivity of the second downlink channel.

[0023] In the embodiments of this application, the second parameter includes the sensitivity of the second downlink channel, and the second transmit power obtained based on the first parameter, the second parameter and the first transmit power can further improve the accuracy of the obtained channel estimation.

[0024] In one embodiment, the terminal device further includes an RFIC (Radio Frequency Identifier);

[0025] The SRS is transmitted using the first transmit power on the first uplink channel, including:

[0026] The first symbol is transmitted via the first uplink channel using the first transmit power in the SRS.

[0027] Based on the second transmit power, SRS is transmitted through the second uplink channel, including:

[0028] The second symbol transmits SRS via the second uplink channel using the second transmit power.

[0029] The first symbol and the second symbol are adjacent symbols indicated by the first order, which is generated by RFIC.

[0030] The SRS transmission method provided in the embodiments of this application is applied to a terminal device, wherein the terminal device and a network device are connected for communication. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel, and the second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched to each other by a first switch, and the second uplink channel and the second downlink channel are switched to each other by a second switch. The terminal device transmits SRS through the first uplink channel and the second uplink channel. The network device is used to determine the channel estimation between the network device and the terminal device based on the SRS transmitted by the terminal device. The method includes: transmitting SRS through the first uplink channel in the first symbol based on a first transmit power, wherein the first transmit power refers to a preset power when the terminal device transmits SRS. The system executes the following steps: First, it acquires a first parameter and a second parameter. The first parameter indicates the insertion loss of the first downlink channel, and the second parameter indicates the insertion loss of the second downlink channel. Based on the first parameter, the second parameter, and the first transmit power, it determines the second transmit power, which refers to the transmit power of the terminal device when transmitting SRS through the second uplink channel. Based on the second transmit power, it transmits SRS through the second uplink channel in the second symbol. When the first symbol transmits SRS, the second downlink channel is in a conducting state, ensuring that the signal sensed by the second downlink channel does not interfere with the SRS currently transmitted through the first uplink channel. Similarly, when the second symbol transmits SRS, the first downlink channel is in a conducting state, ensuring that the signal sensed by the first downlink channel does not interfere with the SRS currently transmitted through the second uplink channel. This effectively improves the reciprocity between the uplink and downlink channels, thereby improving the accuracy of the channel estimation between the network device and the terminal device obtained by the network device based on the SRS transmitted through the uplink channel.

[0031] In one embodiment, the number of second channels is at least two, and correspondingly, the number of second symbols is at least two, with the first order also used to indicate the order of each second symbol.

[0032] In a second aspect, a channel sounding reference signal (SRS) transmitting apparatus is provided, including a unit for performing any of the methods in the first aspect. The apparatus may be a server, a terminal device, or a chip within a terminal device. The apparatus may include an input unit and a processing unit.

[0033] When the device is a terminal device, the processing unit may be a processor, and the input unit may be a communication interface; the terminal device may also include a memory for storing computer program code, which, when the processor executes the computer program code stored in the memory, causes the terminal device to perform any of the methods in the first aspect.

[0034] When the device is a chip within a terminal device, the processing unit can be an internal processing unit of the chip, and the input unit can be an output interface, pin, or circuit, etc.; the chip may also include a memory, which can be an internal memory of the chip (e.g., a register, cache, etc.) or an external memory (e.g., a read-only memory, random access memory, etc.); the memory is used to store computer program code, and when the processor executes the computer program code stored in the memory, the chip performs any of the methods in the first aspect.

[0035] In one possible implementation, a memory is used to store computer program code; a processor executes the computer program code stored in the memory. When the computer program code stored in the memory is executed, the processor performs the following: transmitting SRS using a first transmit power on a first uplink channel, where the first transmit power refers to a preset transmit power when the terminal device transmits SRS; acquiring a first parameter and a second parameter, where the first parameter indicates the insertion loss of a first downlink channel and the second parameter indicates the insertion loss of a second downlink channel; determining a second transmit power based on the first parameter, the second parameter, and the first transmit power, where the second transmit power refers to the transmit power when the terminal device transmits SRS through a second uplink channel; and transmitting SRS using the second transmit power on the second uplink channel.

[0036] Thirdly, a computer-readable storage medium is provided, the computer-readable storage medium storing computer program code, which, when executed by a channel sensing reference signal (SRS) transmitting device, causes the channel sensing reference signal (SRS) transmitting device to perform any of the channel sensing reference signal (SRS) transmitting methods in the first aspect.

[0037] Fourthly, a computer program product is provided, the computer program product comprising: computer program code, which, when executed by a channel sensing reference signal (SRS) transmitting device, causes the channel sensing reference signal (SRS) transmitting device to perform any of the methods in the first aspect.

[0038] The SRS transmission method provided in the embodiments of this application is applied to a terminal device, wherein the terminal device and a network device are connected in a communication connection. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel, and the second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched to each other by a first switch, and the second uplink channel and the second downlink channel are switched to each other by a second switch. The terminal device transmits SRS through the first uplink channel and the second uplink channel. The SRS is a reference signal for the network device to determine the channel estimation between the network device and the terminal device. The method includes: transmitting SRS in the first uplink channel using a first transmit power, where the first transmit power refers to a preset transmit power when the terminal device transmits SRS; and obtaining a first parameter and a second parameter, wherein the first parameter is used to indicate the insertion loss of the first downlink channel. The second parameter is used to indicate the insertion loss of the second downlink channel. Based on the first parameter, the second parameter, and the first transmit power, the second transmit power is determined. The second transmit power refers to the transmit power of the terminal device when transmitting SRS through the second uplink channel. When transmitting SRS using the second transmit power in the second uplink channel, the signal power of the SRS received by the network device differs due to the varying insertion losses between different uplink channels. In the embodiments of this application, the transmit power corresponding to the second uplink channel is adjusted by using the first parameter indicating the insertion loss of the first uplink channel and the second parameter indicating the insertion loss of the second uplink channel. This reduces the impact of differences between different channels on the channel estimation obtained by the network device for the downlink channel, thereby improving the accuracy of the channel estimation between the network device and the terminal device obtained by the network device transmitting SRS based on different uplink channels. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a terminal device applicable to this application;

[0040] Figure 2 This is a schematic diagram illustrating the transmission and reception of signals between a network device and a terminal device applicable to this application;

[0041] Figure 3 This is a schematic diagram of the actual channel estimation and the channel estimation obtained by measurement for a 2*2 MIMO terminal device;

[0042] Figure 4 This is a schematic diagram illustrating the performance loss caused by different levels of isolation between antennas;

[0043] Figure 5 This is a schematic diagram of the impedance in the transmitting state and the impedance in the receiving state;

[0044] Figure 6This is a schematic diagram of the structure of a terminal device applicable to this application;

[0045] Figure 7 This is a schematic diagram of the actual channel estimation and the channel estimation obtained by measurement for a 2*2 MIMO terminal device;

[0046] Figure 8 This is a schematic diagram illustrating the performance loss caused by different levels of isolation between antennas;

[0047] Figure 9 This is a diagram illustrating how inaccurate downlink channel estimation affects the performance of terminal devices.

[0048] Figure 10 This is a schematic diagram of the structure of a terminal device provided in an embodiment of this application;

[0049] Figure 11 This is a schematic diagram illustrating an application scenario of the SRS transmission method provided in the embodiments of this application;

[0050] Figure 12 This is a flowchart illustrating an SRS transmission method provided in an embodiment of this application;

[0051] Figure 13 This is a flowchart illustrating another SRS transmission method provided in an embodiment of this application;

[0052] Figure 14 This is a flowchart illustrating another SRS transmission method provided in an embodiment of this application;

[0053] Figure 15 This is a schematic diagram of a frequency domain resource provided in an embodiment of this application;

[0054] Figure 16 This is a schematic diagram of the switching states of each channel at different times provided in the embodiments of this application;

[0055] Figure 17 This is a schematic diagram of the structure of a terminal device provided in this embodiment of the social situation;

[0056] Figure 18 This is a schematic diagram of a channel sounding reference signal (SRS) transmitting device provided in this application;

[0057] Figure 19 This is a schematic diagram of an electronic device for image processing provided in this application. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; "and / or" in this text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0059] Hereinafter, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0060] For ease of understanding, the examples provided are for reference only and are related to the concepts in the embodiments of this application.

[0061] 1. Upward

[0062] In wireless communication, the data transmitted from the terminal device to the network device is called uplink data, and the data channel used to transmit this data is called the uplink channel.

[0063] 2. Downward

[0064] In wireless communication, the data transmitted from network devices to terminal devices is called downlink data, and the data channel used to transmit this data is called the downlink channel. Because the terminal device uses higher transmit power to send data and lower power to receive data, and because the data processing for transmitted data differs from that for received data, the uplink and downlink channels in a terminal device are usually independent.

[0065] 3. Channel estimation

[0066] Channel estimation refers to the process of estimating the model parameters of a hypothetical channel model from received data. In wireless communication, terminal devices are not fixed in one location but move with the user. This causes changes in the surrounding environment of the terminal device and its distance from the network device, resulting in the model parameters between the terminal and network devices being variable rather than fixed. In this situation, if the network and terminal devices transmit data using fixed model parameters, the communication quality between them will be unstable at different locations. To improve the communication quality between the network and terminal devices, the network device typically estimates the model parameters of the channel model based on the signals transmitted by the terminal device; these estimated model parameters are called channel estimates.

[0067] 4. Channel Sounding Reference Signal (SRS)

[0068] SRS can refer to a probe signal sent by a terminal device to a network device, which can be used for channel quality detection and estimation, beam management, etc.

[0069] Currently, due to the reciprocity between uplink and downlink channels, network devices can typically obtain downlink channel estimates based on SRS transmitted by terminal devices via the uplink channel. However, terminal devices usually have multiple antennas, and they can transmit SRS to network devices through different antennas, effectively creating multiple uplink channels between the terminal and network devices. It should be understood that an uplink channel can indicate a portion of the uplink channel.

[0070] For example, such as Figure 1As shown, the terminal device includes four antennas and two switches. The four antennas are antenna 1, antenna 2, antenna 3, and antenna 4; the two switches are switch 1 and switch 2. When switch 1 is in the state of connecting antenna 1 and the power amplifier (PA), the terminal device can transmit signals through the uplink channel formed by antenna 1 and PA at the current moment. When switch 1 is in the state of connecting antenna 2 and the power amplifier, the terminal device can transmit signals through the uplink channel formed by antenna 2 and PA. When switch 1 is in the state of connecting switch 2 and PA, and switch 2 is in the state of connecting switch 1 and antenna 3, the terminal device can transmit signals through the uplink channel formed by antenna 3 and PA. When switch 1 is in the state of connecting switch 2 and PA, and switch 2 is in the state of connecting switch 1 and antenna 4, the terminal device can transmit signals through the uplink channel formed by antenna 4, microstrip line 1, and PA. Because the impedances of different uplink channels are different, the channel estimation of the downlink channel obtained by transmitting SRS through different uplink channels will have deviations.

[0071] It should be understood that when a terminal device has multiple uplink channels, it typically transmits SRS in a round-robin fashion. That is, while one uplink channel is transmitting SRS, the other uplink channels are disconnected. For example, ... Figure 2 As shown in (a), when uplink channel 1 transmits SRS, uplink channels 2, 3, and 4 are disconnected. In this situation, the signal transmitted by uplink channel 1 is received by uplink channels 2, 3, and 4 and reflected, resulting in the SRS signal transmitted by uplink channel 1 being an electromagnetic wave signal superimposed with secondary reflections from uplink channels 2, 3, and 4. However, when the downlink channel of the terminal device receives a signal, the other downlink channels are all in receiving mode. Therefore, the signal received by the downlink channel will not radiate to the other downlink channels. For example, as shown in (a), Figure 2 As shown in (b), when a signal is received on downlink channel 1, the signal received on downlink channels 2, 3, and 4 will not be coupled to the signal received on downlink channel 1. That is, due to secondary radiation from the uplink channel, there is a difference between the uplink and downlink channels. This leads to a deviation in the channel estimation of the downlink channel obtained from the SRS transmitted through the uplink channel.

[0072] For example, taking a 2*2 Multiple Input Multiple Output (MIMO) terminal device as an example, such as Figure 3 As shown, if the channel estimation for the downlink channel is:

[0073]

[0074] Due to the difference between the uplink and downlink channels caused by secondary radiation, the channel estimate of the downlink channel obtained by the network device based on the SRS transmitted by the terminal device in the uplink channel is as follows:

[0075]

[0076] Among them, S 21 This indicates the isolation between antenna 1 and antenna 2.

[0077] By simulating the differences between the uplink and downlink channels, the channel estimation for the downlink channel is obtained as follows: Figure 4 As shown, with an isolation of 20dB between antenna 1 and antenna 2, a performance loss of 0.3dB will occur. Figure 4 As shown in (a) above, a 15 dB difference between l1 and l2 results in a 0.6 dB performance loss, as... Figure 4 As shown in (b) of the diagram.

[0078] Furthermore, since the channel impedance seen from the antenna is different when the terminal device is in transmit (TX) mode and receive (RX) mode, such as... Figure 5 As shown, Z TX ≠Z RX This can also lead to inaccurate channel estimation of the downlink channel based on the SRS transmitted through the uplink channel.

[0079] For example, such as Figure 6 As shown, from the antenna side, the impedance of the uplink channel is formed by PA, filter 1, switch 1, switch 2, and the antenna, while the impedance of the downlink channel is formed by the low-noise amplifier (LNA), filter 2, switch 2, and the antenna. The section from switch 2 to the antenna is the same in both the uplink and downlink channels, so there is no difference. However, the section from PA to switch 2 in the uplink channel differs from the section from LNA to switch 2 in the downlink channel, resulting in different impedances when the terminal device is in transmit and receive states.

[0080] Due to the impedance difference between the uplink and downlink channels, the channel estimation of the downlink channel obtained from the SRS transmitted through the uplink channel is biased. For example, taking a 2x2 MIMO terminal device as an example... Figure 7 As shown, if the channel estimation for the downlink channel is:

[0081]

[0082] Because the impedance of the uplink channel is affected by the impedance of the downlink channel in different channels, therefore, by means of... Figure 7 When the uplink channel transmits SRS as shown, if the transmit power of the upper uplink channel is l1, the transmit power of the lower uplink channel is l2, where l1 ≠ l2. Therefore, the channel estimate of the downlink channel obtained by the network device based on the measurement of the SRS transmitted by the terminal device's uplink channel is:

[0083]

[0084] Where k refers to the imbalance between different uplink channels caused by the impedance of the uplink channel being affected by the downlink channel.

[0085] By simulating the differences between the uplink and downlink channels, the channel estimation for the downlink channel is obtained as follows: Figure 8 As shown, a 1dB difference between l1 and l2 results in a 0.2dB performance loss. Figure 8 As shown in (a) above, a 3dB difference between l1 and l2 results in a 0.9dB performance loss, as... Figure 8 As shown in (b) of the diagram.

[0086] In a real test, such as Figure 9 As shown, where, Figure 9 In the diagram, (a) represents a terminal device that is indistinguishable between the uplink and downlink channels. Figure 9 (b) in the text refers to terminal equipment where there is a difference between the uplink and downlink channels. Figure 9 In (a) of the diagram, there is no significant difference between the uplink and downlink channels; therefore, the Reference Signal Receiving Power (RSRP) of the SRS on all four channels is not significantly different. The network device assumes that the communication quality of all four channels is relatively stable, and therefore allocates the same amount of data to each channel. However, Figure 9 In case (b), there is a difference between the uplink and downlink channels. One channel (the target channel shown in the figure) has a significantly lower RSRP than the other channels. Therefore, the network device considers the communication on the target channel to be poor and allocates a different amount of data to the target channel than to the other channels. This leads to a decrease in the spectral efficiency of the target channel, which in turn reduces the throughput of the terminal device.

[0087] In view of this, embodiments of this application provide a method for transmitting a Channel Sounding Reference Signal (SRS), applied to a terminal device. The terminal device and a network device are connected in a communication manner. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel. The second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched between each other via a first switch, and the second uplink channel and the second downlink channel are switched between each other via a second switch. The terminal device transmits the SRS through the first uplink channel and the second uplink channel. The SRS serves as a reference signal for the network device to determine the channel estimation between the network device and the terminal device. The method includes: transmitting the SRS in the first uplink channel using a first transmit power, where the first transmit power refers to a preset transmit power when the terminal device transmits the SRS; and acquiring a first parameter and a second parameter, where the first parameter indicates the first downlink channel's... Insertion loss, the second parameter is used to indicate the insertion loss of the second downlink channel; the second transmit power is determined according to the first parameter, the second parameter and the first transmit power, the second transmit power refers to the transmit power of the terminal device when transmitting SRS through the second uplink channel; when transmitting SRS through the second uplink channel using the second transmit power, since the signal power of the SRS received by the network device is different due to the different insertion losses between different uplink channels when transmitting SRS through different uplink channels, the first parameter indicating the insertion loss of the first uplink channel and the second parameter indicating the insertion loss of the second uplink channel are used to adjust the transmit power corresponding to the second uplink channel, thereby reducing the impact of the differences between different channels on the channel estimation of the downlink channel obtained by the network device, and thus improving the accuracy of the channel estimation of the downlink channel between the network device and the terminal device obtained by the network device transmitting SRS based on different uplink channels.

[0088] The Channel Sounding Reference Signal (SRS) transmission method provided in this application can be applied to electronic devices. Optionally, the electronic device includes a terminal device, which can also be called a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal device can be a mobile phone, smart TV, wearable device, tablet computer, computer with wireless transceiver capabilities, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc. The embodiments of this application do not limit the specific technology or device form used in the terminal device.

[0089] For example, Figure 10 A schematic diagram of the structure of electronic device 100 is shown. Electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, antenna 1, antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, a headphone jack 170D, a sensor module 180, buttons 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a subscriber identification module (SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, a barometric pressure sensor 180C, a magnetic sensor 180D, an accelerometer sensor 180E, a distance sensor 180F, a proximity sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, etc.

[0090] It is understood that the structures illustrated in the embodiments of this application do not constitute a specific limitation on the electronic device 100. In other embodiments of this application, the electronic device 100 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0091] Processor 110 may include one or more processing units, such as: application processor (AP), modem processor, graphics processing unit (GPU), image signal processor (ISP), controller, memory, video codec, digital signal processor (DSP), baseband processor, and / or neural network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0092] The controller can be the nerve center and command center of the electronic device 100. The controller can generate operation control signals according to the instruction opcode and timing signals to complete the control of fetching and executing instructions.

[0093] The processor 110 may also include a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. This memory can store instructions or data that the processor 110 has just used or that are used repeatedly. If the processor 110 needs to use the instruction or data again, it can retrieve it directly from the memory. This avoids repeated accesses, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0094] In one possible scenario, the electronic device 100 includes multiple antennas; for example, the electronic device 100 may include two antennas. These two antennas are antenna 1 and antenna 2. The wireless communication function of the electronic device 100 can be implemented through antenna 1, antenna 2, a mobile communication module 150, a wireless communication module 160, a modem processor, and a baseband processor, etc.

[0095] Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in electronic device 100 can be used to cover one or more communication frequency bands. Different antennas can also be multiplexed to improve antenna utilization. For example, antenna 1 can be multiplexed as a diversity antenna for a wireless local area network. In some other embodiments, the antennas can be used in conjunction with tuning switches.

[0096] The mobile communication module 150 can provide solutions for wireless communication, including 2G / 3G / 4G / 5G, applied to the electronic device 100. The mobile communication module 150 may include at least one filter, switch, power amplifier, low-noise amplifier (LNA), etc. The mobile communication module 150 can receive electromagnetic waves via antenna 1, and perform filtering, amplification, and other processing on the received electromagnetic waves before transmitting them to a modem processor for demodulation. The mobile communication module 150 can also amplify the signal modulated by the modem processor and convert it into electromagnetic waves for radiation via antenna 1. In some embodiments, at least some functional modules of the mobile communication module 150 may be housed in the processor 110. In some embodiments, at least some functional modules of the mobile communication module 150 and at least some modules of the processor 110 may be housed in the same device.

[0097] The modem processor may include a modulator and a demodulator. The modulator modulates the low-frequency baseband signal to be transmitted into a mid-to-high frequency signal. The demodulator demodulates the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low-frequency baseband signal to the baseband processor for processing. After processing by the baseband processor, the low-frequency baseband signal is transmitted to the application processor. The application processor outputs sound signals through an audio device (not limited to speaker 170A, receiver 170B, etc.) or displays images or videos through the display screen 194. In some embodiments, the modem processor may be a separate device. In other embodiments, the modem processor may be independent of the processor 110 and may be housed in the same device as the mobile communication module 150 or other functional modules.

[0098] The wireless communication module 160 can provide solutions for wireless communication applications on the electronic device 100, including wireless local area networks (WLANs) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), and infrared (IR) technologies. The wireless communication module 160 can be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via antenna 2, performs frequency modulation and filtering of the electromagnetic wave signals, and sends the processed signal to processor 110. The wireless communication module 160 can also receive signals to be transmitted from processor 110, perform frequency modulation and amplification, and convert them into electromagnetic waves for radiation via antenna 2.

[0099] In some embodiments, antenna 1 of electronic device 100 is coupled to mobile communication module 150, and antenna 2 is coupled to wireless communication module 160, enabling electronic device 100 to communicate with networks and other devices via wireless communication technology. The wireless communication technology may include Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time-Division Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE), 5G (the 5th Generation of wireless communication system), BT, GNSS, WLAN, NFC, FM, and / or IR technologies, etc. The GNSS may include the Global Positioning System (GPS), the Global Navigation Satellite System (GLONASS), the BeiDou Navigation Satellite System (BDS), the Quasi-Zenith Satellite System (QZSS), and / or satellite-based augmentation systems (SBAS).

[0100] It should be noted that any electronic device mentioned in the embodiments of this application may include more or fewer modules in electronic device 100.

[0101] The software system of electronic device 100 can adopt a layered architecture, event-driven architecture, microkernel architecture, microservice architecture, or cloud architecture.

[0102] The application scenarios provided by the embodiments of this application are described below with reference to the accompanying drawings.

[0103] Figure 11 This is a schematic diagram illustrating the application environment of the channel sounding reference signal (SRS) transmission method provided in one embodiment of this application. For example... Figure 11As shown, a communication connection exists between terminal device 100 and network device 200. Terminal device 100 includes four antennas: antenna 1, antenna 2, antenna 3, and antenna 4. This provides four channels for signal transmission: channel 1 (via antenna 1), channel 2 (via antenna 2), channel 3 (via antenna 3), and channel 4 (via antenna 4). Each channel can be divided into uplink and downlink channels based on its switching state. For example, via switch 1, channel 1 can be divided into uplink and downlink channels; via switch 2, channel 2 can be divided into uplink and downlink channels; via switch 3, channel 3 can be divided into uplink and downlink channels; and via switch 4, channel 4 can be divided into uplink and downlink channels. Exemplarily, terminal device 100 sends SRS (Short-Side Response) to network device 200 in turn through the four uplink channels, enabling network device 200 to determine the channel estimate of the downlink channel between network device 200 and terminal device 100 based on the SRS.

[0104] It should be understood that the above are illustrative examples of application scenarios and do not limit the application scenarios of this application in any way.

[0105] The following is combined with Figures 12 to 17 The method for transmitting the Channel Sounding Reference Signal (SRS) provided in the embodiments of this application will be described in detail.

[0106] Figure 12 This application provides a flowchart illustrating an SRS transmission method according to an embodiment. The method is applied to a terminal device, which communicates with a network device. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel, and the second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched between each other via a first switch, and the second uplink channel and the second downlink channel are switched between each other via a second switch. The terminal device transmits SRS through either the first uplink channel or the second uplink channel. The SRS serves as a reference signal for the network device to determine the channel estimation between the network device and the terminal device. The method includes:

[0107] S101. In the first uplink channel, the SRS is transmitted using the first transmit power, where the first transmit power refers to the preset transmit power when the terminal device transmits the SRS.

[0108] It should be understood that terminal devices typically have multiple antennas, and correspondingly, multiple uplink channels. Each uplink channel has its corresponding downlink channel. The first uplink channel can refer to any one of the multiple uplink channels in the terminal device; this application embodiment does not limit this.

[0109] Typically, a terminal device can transmit SRS in turn through multiple uplink channels. For example, consider a terminal device with four uplink channels: Uplink Channel 1, Uplink Channel 2, Uplink Channel 3, and Uplink Channel 4. The terminal device transmits SRS sequentially through Uplink Channel 1, Uplink Channel 2, Uplink Channel 3, and Uplink Channel 4 in a preset order.

[0110] It should be understood that when transmitting SRS through multiple uplink channels, the terminal device usually stores a preset transmit power value, and the multiple uplink channels can use the preset transmit power as the transmit power for transmitting SRS.

[0111] Since the first uplink channel can refer to any one of multiple uplink channels in the terminal device, using a preset transmit power as the transmit power for transmitting SRS on the first uplink channel can mean using a preset transmit power as the transmit power for any uplink channel. It should be understood that when one of the uplink channels transmits SRS using a preset transmit power, that uplink channel is the first uplink channel.

[0112] S102. Obtain the first parameter and the second parameter. The first parameter is used to indicate the insertion loss of the first downlink channel, and the second parameter is used to indicate the insertion loss of the second downlink channel.

[0113] The first uplink channel is an uplink channel that transmits SRS based on a preset transmit power. In the terminal device, the other uplink channels besides the first uplink channel are the second uplink channels. Since the terminal device can include multiple uplink channels, that is, the number of second uplink channels can be one or more, and this embodiment does not limit this.

[0114] For example, the terminal device includes four uplink channels, namely uplink channel 1, uplink channel 2, uplink channel 3, and uplink channel 4. When uplink channel 1 is the first uplink channel, uplink channels 2, 3, and 4 are the second uplink channels.

[0115] It should be understood that the first uplink channel can be switched to the first downlink channel by a switch, and the second uplink channel can be switched to the second downlink channel by a switch. That is to say, there is a one-to-one correspondence between the first uplink channel and the first downlink channel, and a one-to-one correspondence between the second uplink channel and the second downlink channel.

[0116] For example, let's continue with the example of a terminal device having four uplink channels: uplink channel 1, uplink channel 2, uplink channel 3, and uplink channel 4. Uplink channel 1 can be switched to downlink channel 1 via switch 1, thus uplink channel 1 and downlink channel 1 correspond to each other; uplink channel 2 can be switched to downlink channel 2 via switch 2, thus uplink channel 2 and downlink channel 2 correspond to each other; uplink channel 3 can be switched to downlink channel 3 via switch 3, thus uplink channel 3 and downlink channel 3 correspond to each other; uplink channel 4 can be switched to downlink channel 4 via switch 4, thus uplink channel 4 and downlink channel 4 correspond to each other. When the first uplink channel is uplink channel 1, the first downlink channel is downlink channel 1; the second uplink channels are uplink channel 2, uplink channel 3, and uplink channel 4; correspondingly, the second downlink channels are downlink channel 2, downlink channel 3, and downlink channel 4.

[0117] The first parameter can be used to indicate the insertion loss of the first downlink channel, and the second parameter can be used to indicate the insertion loss of the second downlink channel. When there are multiple second downlink channels, the second parameter can include multiple values, each used to indicate the insertion loss of the corresponding second downlink channel.

[0118] For example, when the second downlink channel includes downlink channel 2, downlink channel 3 and downlink channel 4, the second parameter may include parameter 2, parameter 3 and parameter 4, wherein parameter 2 is used to indicate the insertion loss of downlink channel 2, parameter 3 is used to indicate the insertion loss of downlink channel 3 and parameter 4 is used to indicate the insertion loss of downlink channel 4.

[0119] In one possible scenario, the terminal device can measure the insertion loss of each downlink channel in real time to obtain the first and second parameters.

[0120] In one possible scenario, the parameters indicating the insertion loss of each downlink channel can be pre-stored in the memory of the terminal device. The terminal device can read the corresponding parameters of the first downlink channel to obtain the first parameter, and read the corresponding parameters of the second downlink channel to obtain the second parameter.

[0121] For example, the first parameter may refer to the noise figure corresponding to the first downlink channel, and the second parameter may refer to the noise figure corresponding to the second downlink channel.

[0122] For example, the first parameter may refer to the sensitivity corresponding to the first downlink channel, and the second parameter may refer to the sensitivity corresponding to the second downlink channel.

[0123] S103. Determine the second transmission power based on the first parameter, the second parameter, and the first transmission power. The second transmission power refers to the transmission power of the terminal device when transmitting SRS through the second uplink channel.

[0124] It should be understood that since the first parameter can be used to indicate the insertion loss of the first uplink channel, and the second parameter can be used to indicate the insertion loss of the second uplink channel, the first parameter and the second parameter are usually different values. Therefore, the first transmit power (equivalent to the preset transmit power of the second uplink channel) can be adjusted by the difference between the first parameter and the second parameter to obtain the transmit power used when the second uplink channel actually transmits SRS (i.e., the second transmit power). This ensures that when the second uplink channel actually transmits SRS using the second transmit power, the signal power received by the network device is the same as the signal power received by the network device when the SRS is transmitted by the first uplink channel. Consequently, when the terminal device transmits SRS through different uplink channels, there is no significant difference in the signal power received by the network device.

[0125] It should be understood that there can be multiple second uplink channels and multiple second parameters. Correspondingly, in the process of determining the second transmission power based on the first parameter, the second parameter and the first transmission power, it is also necessary to determine the second transmission power corresponding to each second uplink channel separately.

[0126] For example, the second uplink channel includes uplink channel 2, uplink channel 3, and uplink channel 4. The second parameter corresponding to uplink channel 2 is parameter 2, the second parameter corresponding to uplink channel 3 is parameter 3, and the second parameter corresponding to uplink channel 4 is parameter 4. Then, the terminal device can determine the second transmit power of uplink channel 2 as transmit power 2 based on the first parameter, parameter 2, and the second transmit power; determine the second transmit power of uplink channel 3 as transmit power 3 based on the first parameter, parameter 3, and the second transmit power; and determine the second transmit power of uplink channel 4 as transmit power 4 based on the first parameter, parameter 4, and the second transmit power.

[0127] S104. Transmit SRS using the second transmit power in the second uplink channel.

[0128] It should be understood that there can be multiple second uplink channels. Continuing with the example of uplink channels 2, 3, and 4, if the second transmit power of uplink channel 2 is determined to be transmit power 2, the second transmit power of uplink channel 3 to be transmit power 3, and the second transmit power of uplink channel 4 to be transmit power 4, then transmit power 2 can be used as the transmit power of uplink channel 2 to transmit SRS, transmit power 3 can be used as the transmit power of uplink channel 3 to transmit SRS, and transmit power 4 can be used as the transmit power of uplink channel 4 to transmit SRS.

[0129] It should be understood that transmission power 2, transmission power 3 and transmission power 4 can be the same transmission power or different transmission powers, and the embodiments of this application do not limit this.

[0130] When there are multiple second uplink channels, SRS can be sent sequentially in a preset order. Alternatively, SRS can be sent through only one uplink channel at a time.

[0131] The SRS transmission method provided in the embodiments of this application is applied to a terminal device, wherein the terminal device and a network device are connected in a communication connection. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel, and the second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched to each other by a first switch, and the second uplink channel and the second downlink channel are switched to each other by a second switch. The terminal device transmits SRS through the first uplink channel and the second uplink channel. The SRS is a reference signal for the network device to determine the channel estimation between the network device and the terminal device. The method includes: transmitting SRS in the first uplink channel using a first transmit power, where the first transmit power refers to the preset transmit power when the terminal device transmits SRS; obtaining a first parameter and a second parameter, where the first parameter is used to indicate the insertion loss of the first downlink channel, and the second parameter is used to indicate the insertion loss of the first downlink channel. The parameter is used to indicate the insertion loss of the second downlink channel; the second transmit power is determined based on the first parameter, the second parameter, and the first transmit power. The second transmit power refers to the transmit power of the terminal device when transmitting SRS through the second uplink channel. When transmitting SRS through the second uplink channel using the second transmit power, the signal power of the SRS received by the network device is different due to the different insertion losses between different uplink channels. In the embodiments of this application, the transmit power corresponding to the second uplink channel is adjusted by the first parameter indicating the insertion loss of the first uplink channel and the second parameter indicating the insertion loss of the second uplink channel. This reduces the impact of the differences between different channels on the channel estimation of the downlink channel obtained by the network device, thereby improving the accuracy of the channel estimation of the downlink channel between the network device and the terminal device obtained by the network device transmitting SRS based on different uplink channels.

[0132] It should be understood that each channel has its corresponding maximum transmit power. In one possible scenario, the second transmit power, determined based on the first parameter, the second parameter, and the first transmit power, might exceed the maximum transmit power corresponding to the second uplink channel. If the second transmit power exceeds the maximum transmit power of the second uplink channel, it may damage the components of the terminal device on the second uplink channel. Therefore, to protect the safety of the components in the terminal device, after determining the second transmit power based on the first parameter, the second parameter, and the first transmit power, the second transmit power can be adjusted based on the maximum transmit power of each channel to obtain an adjusted second transmit power, which is then used as the transmit power corresponding to the second uplink channel. The following will illustrate this further. Figure 13 The embodiments shown will be described in detail below.

[0133] Figure 13 This is a flowchart illustrating another SRS transmission method provided in an embodiment of this application. The method is applied to a terminal device, which communicates with a network device. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel, and the second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched between each other via a first switch, and the second uplink channel and the second downlink channel are switched between each other via a second switch. The terminal device transmits SRS through the first uplink channel and the second uplink channel. The network device determines a channel estimate between the network device and the terminal device based on the SRS transmitted by the terminal device. The method includes:

[0134] S201. In the first uplink channel, the SRS is transmitted using the first transmit power, where the first transmit power refers to the preset transmit power when the terminal device transmits the SRS.

[0135] S202. Obtain the difference between the first parameter and the second parameter. The first parameter is used to indicate the insertion loss of the first downlink channel, and the second parameter is used to indicate the insertion loss of the second downlink channel.

[0136] Optionally, the first parameter includes the sensitivity of the first downlink channel.

[0137] It should be understood that sensitivity is an important parameter used to measure the performance of the receiving channel (downlink channel). When the signal energy in the receiving channel is less than the nominal sensitivity, the receiving channel will not receive any signal; in other words, sensitivity is the minimum threshold at which the receiving channel can receive a signal. Generally, the lower the insertion loss of the downlink channel, the higher the sensitivity. That is to say, sensitivity can be used to indicate the insertion loss of the downlink channel.

[0138] In actual testing, the sensitivity of the first downlink channel is used as the first parameter. Then, based on the first parameter, the second parameter, and the first transmit power, the second transmit power is obtained. This can further reduce the error in the channel estimation of the downlink channel obtained by the network device based on transmitting SRS with the first transmit power in the first uplink channel and transmitting SRS with the second transmit power in the second uplink channel, thereby improving the accuracy of the obtained channel estimation of the downlink channel.

[0139] In the embodiments of this application, the first parameter includes the sensitivity of the first downlink channel, and the second transmit power obtained based on the first parameter, the second parameter, and the first transmit power enables the network device to obtain a more accurate channel estimate of the downlink channel based on the SRS transmitted by different uplink channels on the terminal device.

[0140] Optionally, the second parameter includes the sensitivity of the second downlink channel.

[0141] In the embodiments of this application, the second parameter includes the sensitivity of the second downlink channel, and the second transmit power obtained based on the first parameter, the second parameter and the first transmit power can further improve the accuracy of the channel estimation of the obtained downlink channel.

[0142] S203. Obtain the maximum transmit power corresponding to the second uplink channel.

[0143] It should be understood that each electronic device has its corresponding maximum transmission power. To protect the security of the electronic devices on the terminal device, the transmission channel (equivalent to the second uplink channel) needs to determine its maximum transmission power based on the maximum transmission power of the electronic devices connected to it. If the actual transmission power of the second uplink channel exceeds its corresponding maximum transmission power, the electronic devices on the second uplink channel are at risk of failure. Typically, the actual transmission power of the second uplink channel is less than or equal to the aforementioned maximum transmission power.

[0144] S204. Adjust the first transmission power based on the difference to obtain the third transmission power.

[0145] For example, as shown in Table 1, the first uplink channel refers to uplink channel 1, and the second uplink channel includes uplink channel 2, uplink channel 3, and uplink channel 4. The first parameter can refer to the sensitivity R1 of uplink channel 1. The second parameter can include the sensitivity R2 of uplink channel 2, the sensitivity R3 of uplink channel 3, and the sensitivity R4 of uplink channel 4. The first transmit power can refer to the transmit power A of uplink channel 1. The first transmit power is adjusted based on the difference between the first and second parameters, and the resulting third transmit power is shown in Table 1. Specifically, the third transmit power of uplink channel 2 is A + R1 - R2, the third transmit power of uplink channel 3 is A + R1 - R3, and the third transmit power of uplink channel 4 is A + R1 - R4.

[0146] Table 1

[0147] Sensitivity (dBm) R1 R2 R3 R4 Third transmit power (dBm) A A+R1-R2 A+R1-R3 A+R1-R4

[0148] In one possible scenario, the second transmit power can be the third transmit power. That is, the second transmit power of uplink channel 2 is A+R1-R2, the second transmit power of uplink channel 3 is A+R1-R3, and the second transmit power of uplink channel 4 is A+R1-R4.

[0149] S205. Based on the third transmission power and the maximum transmission power, the second transmission power is obtained.

[0150] For example, as shown in Table 2, the first uplink channel refers to uplink channel 1, and the second uplink channel includes uplink channel 2, uplink channel 3, and uplink channel 4; the first parameter can refer to the sensitivity R1 of uplink channel 1. The second parameter can include the sensitivity R2 of uplink channel 2, the sensitivity R3 of uplink channel 3, and the sensitivity R4 of uplink channel 4. The first transmit power can refer to the transmit power A of uplink channel 1. The maximum transmit power of uplink channel 1 is PMax1, the maximum transmit power of uplink channel 2 is PMax2, the maximum transmit power of uplink channel 3 is PMax3, and the maximum transmit power of uplink channel 4 is PMax4.

[0151] Table 2

[0152]

[0153] Optionally, if the third transmission power is greater than the maximum transmission power, the second transmission power is the maximum transmission power.

[0154] Optionally, if the third transmission power is less than or equal to the maximum transmission power, the second transmission power is the third transmission power.

[0155] In other words, the second transmit power of uplink channel 2 is the minimum of its corresponding third transmit power (A+R1-R2) and its corresponding maximum transmit power (PMax2). The second transmit power of uplink channel 3 is the minimum of its corresponding third transmit power (A+R1-R3) and its corresponding maximum transmit power (PMax3). The second transmit power of uplink channel 4 is the minimum of its corresponding third transmit power (A+R1-R4) and its corresponding maximum transmit power (PMax4).

[0156] S206. Transmit SRS using the second transmit power in the second uplink channel.

[0157] The SRS transmission method provided in the embodiments of this application obtains the difference between the first parameter and the second parameter, and corrects the preset transmission power based on the difference between the first parameter and the second parameter to obtain the third transmission power. Then, the smaller transmission power is selected from the maximum transmission power on each channel and the third transmission power of each channel as the second transmission power of the uplink channel. This ensures that the determined second transmission power of the second uplink channel not only improves the accuracy of the channel estimation determined by the network device, but also that the determined second transmission power is less than or equal to the maximum transmission power. Therefore, transmitting SRS will not damage the electronic components in the terminal device.

[0158] Depend on Figure 2It is known that when one uplink channel (e.g., uplink channel 1) in the terminal device transmits SRS, the other uplink channels are in a disconnected state. This means that when uplink channel 1 transmits SRS, the electromagnetic wave signals reflected secondaryly from other channels can affect the performance of uplink channel 1. Therefore, when uplink channel 1 transmits SRS, the switching state of other channels can be set to the receiving channel (i.e., the downlink channel) being on. This can prevent other channels from sensing the SRS transmitted by channel 1. The following will explain... Figure 14 The embodiments shown will be described in detail.

[0159] Figure 14 This is a flowchart illustrating another SRS transmission method provided in an embodiment of this application. The method is applied to a terminal device, which communicates with a network device. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel, and the second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched between each other via a first switch, and the second uplink channel and the second downlink channel are switched between each other via a second switch. The terminal device transmits SRS through the first uplink channel and the second uplink channel. The network device determines a channel estimate between the network device and the terminal device based on the SRS transmitted by the terminal device. The method includes:

[0160] S301. Based on the first transmit power, the first symbol transmits SRS through the first uplink channel. The first transmit power refers to the preset transmit power when the terminal device transmits SRS.

[0161] It should be understood that during wireless communication data transmission, carrier signals are typically divided into frames. Each frame is 10ms long. A frame is further divided into 10 subframes, each 1ms long. Each subframe is then divided into multiple slots, and each slot is further divided into multiple symbols. The number of slots and symbols within a subframe varies depending on the communication protocol.

[0162] During the SRS transmission process, the terminal device transmits SRS in turn through multiple uplink channels.

[0163] For example, such as Figure 15 As shown, the terminal device transmits SRS through the first uplink channel in symbol 1 (first symbol). When symbol 1 transmits SRS through the first uplink channel, the transmit power can be the first transmit power.

[0164] S302. Obtain the difference between the first parameter and the second parameter, where the first parameter is used to indicate the insertion loss of the first downlink channel and the second parameter is used to indicate the insertion loss of the second downlink channel.

[0165] Optionally, the first parameter includes the sensitivity of the first downlink channel.

[0166] Optionally, the second parameter includes the sensitivity of the second downlink channel.

[0167] S303. Obtain the maximum transmit power corresponding to the second uplink channel.

[0168] S304. Adjust the first transmission power based on the difference to obtain the third transmission power.

[0169] S305. Based on the third transmission power and the maximum transmission power, the second transmission power is obtained.

[0170] Optionally, if the third transmission power is greater than the maximum transmission power, the second transmission power is the maximum transmission power. If the third transmission power is less than or equal to the maximum transmission power, the second transmission power is the third transmission power.

[0171] S306. Based on the second transmit power, the SRS is transmitted through the second uplink channel on the second symbol.

[0172] In one possible scenario, the terminal device may have multiple second uplink channels. For example, the terminal device may have uplink channel 2, uplink channel 3, and uplink channel 4 as second uplink channels. When transmitting SRS through the second uplink channels, the terminal device also transmits them in turn. Correspondingly, the number of second symbols may also be multiple, including symbol 2, symbol 3, and symbol 4.

[0173] For example, continue as follows Figure 15 As shown, the terminal device transmits SRS through uplink channel 1 (first uplink channel) at symbol 1 (first symbol). It transmits SRS through uplink channel 2 (one of the second uplink channels) at symbol 2 (second symbol), through uplink channel 3 (one of the second uplink channels) at symbol 3 (second symbol), and through uplink channel 3 (one of the second uplink channels) at symbol 4 (second symbol).

[0174] When an SRS is transmitted through an uplink channel, the switching states on other channels are RX on.

[0175] For example, such as Figure 16As shown in symbol 1, when SRS is transmitted through uplink channel 1, switch 1 indicates that antenna 1 is connected to uplink channel 1; switch 2 indicates that antenna 2 is connected to downlink channel 2; switch 3 indicates that antenna 3 is connected to downlink channel 3; and switch 4 indicates that antenna 4 is connected to downlink channel 4. In symbol 2, when SRS is transmitted through uplink channel 2, switch 1 indicates that antenna 1 is connected to downlink channel 1; switch 2 indicates that antenna 2 is connected to uplink channel 2; switch 3 indicates that antenna 3 is connected to downlink channel 3; and switch 4 indicates that antenna 4 is connected to downlink channel 4. In symbol 3, when SRS is transmitted through uplink channel 3, switch 1 indicates that antenna 1 is connected to downlink channel 1; switch 2 indicates that antenna 2 is connected to downlink channel 2; switch 3 indicates that antenna 3 is connected to uplink channel 3; and switch 4 indicates that antenna 4 is connected to downlink channel 4. When SRS is transmitted through uplink channel 4 in symbol 4, the state of switch 1 indicates that antenna 1 is connected to downlink channel 1, the state of switch 2 indicates that antenna 2 is connected to downlink channel 2, the state of switch 3 indicates that antenna 3 is connected to downlink channel 3, and the state of switch 4 indicates that antenna 4 is connected to uplink channel 4.

[0176] The SRS transmission method provided in the embodiments of this application transmits SRS in one of the uplink channels of the terminal device while other channels are downlink channels in a conducting state. This ensures that the signals sensed by other channels will not interfere with the currently transmitted SRS, which is equivalent to improving the reciprocity between the uplink and downlink channels. This, in turn, improves the accuracy of the channel estimation of the downlink channel between the network device and the terminal device obtained by the network device based on the SRS transmitted by the uplink channel.

[0177] It should be understood that when SRS is transmitted through uplink channel 1 in symbol 1, the state of switch 1 indicates that antenna 1 is connected to uplink channel 1; the state of switch 2 can also indicate that antenna 2 is connected to matching circuit 2; the state of switch 3 indicates that antenna 3 is connected to matching circuit 3; and the state of switch 4 indicates that antenna 4 is connected to matching circuit 4. Matching circuits 2, 3, and 4 can be matching circuits with an impedance of 50 ohms. This ensures that the signals sensed by antennas 2, 3, and 4 in symbol 1 are absorbed by matching circuits 2, 3, and 4, without secondary radiation through them, thus preventing any impact on the accuracy of channel estimation for the downlink channel determined by the network equipment.

[0178] Since SRS transmission via different uplink channels occurs between different symbols, typically, when transmitting SRS on uplink channel 1, the terminal device sets the transmit power of uplink channel 1 to the first transmit power and sets the transmit power of other uplink channels to 0. Therefore, switching the uplink channel for transmitting SRS is equivalent to switching the transmit power of the uplink channel, which is also equivalent to switching the output power of the power amplifier. Optionally, the first symbol and the second symbol are adjacent symbols indicated by a first sequence, which is generated by the RFIC chip in the terminal device.

[0179] Since SRS transmission via different uplink channels occurs between different symbols, the available switching time for switching uplink transmit power is typically short. Therefore, switching can be performed using an RFIC (Radio Frequency Identifier) ​​chip in the terminal equipment. The power amplifier is usually connected to the RF power supply and the RFIC, such as... Figure 17 As shown. For example, the RFIC can control the power amplifier corresponding to uplink channel 1 to output power of the first symbol as the first transmit power in a first sequence; control the power amplifier corresponding to uplink channel 2 to output power of the second transmit power in symbol 2 (one of the second symbols); control the power amplifier corresponding to uplink channel 3 to output power of the second transmit power in symbol 3 (one of the second symbols); and control the power amplifier corresponding to uplink channel 4 to output power of the second transmit power in symbol 4 (one of the second symbols).

[0180] The RFIC stores the first sequence of instructions on how to switch the uplink channel for transmitting SRS. That is, the RFIC controls the power amplifier to transmit SRS through the first uplink channel for the first symbol, and the RFIC controls the power amplifier to transmit SRS through the second uplink channel for the second symbol.

[0181] For example, the terminal device includes a first uplink channel and a second uplink channel, wherein the first uplink channel is uplink channel 1 and the second uplink channel is uplink channel 2. Correspondingly, the first symbol is symbol 1 and the second symbol is symbol 2. The RFIC controls uplink channel 1 to send SRS in symbol 1 (the first symbol) and controls uplink channel 2 to send SRS in symbol 2 (the second symbol).

[0182] It should be understood that there can be multiple second uplink channels, and correspondingly, there can also be multiple second symbols. The second symbols can also be adjacent symbols. The first order generated in the RFIC can also be used to indicate the order of the individual second symbols.

[0183] For example, the terminal device includes a first uplink channel and three second uplink channels. The first uplink channel is uplink channel 1, and the second uplink channels include uplink channels 2, 3, and 4. Correspondingly, the first symbol is symbol 1, and the second symbols include symbol 2, symbol 3, and symbol 4. The RFIC controls uplink channel 1 to transmit SRS in symbol 1 (the first symbol), controls uplink channel 2 to transmit SRS in symbol 2 (one of the second symbols), controls uplink channel 3 to transmit SRS in symbol 3 (one of the second symbols), and controls uplink channel 4 to transmit SRS in symbol 4 (one of the second symbols).

[0184] The SRS transmission method provided in the embodiments of this application is applied to a terminal device, wherein the terminal device and a network device are connected for communication. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel, and the second channel includes a second uplink channel and a second downlink channel. The first uplink channel and the first downlink channel are switched to each other by a first switch, and the second uplink channel and the second downlink channel are switched to each other by a second switch. The terminal device transmits SRS through the first uplink channel and the second uplink channel. The network device is used to determine the channel estimation between the network device and the terminal device based on the SRS transmitted by the terminal device. The method includes: transmitting SRS through the first uplink channel in the first symbol based on a first transmit power. The first transmit power refers to a preset transmit power when the terminal device transmits SRS. The system first transmits SRS through the first uplink channel and then obtains a first parameter and a second parameter, where the first parameter indicates the insertion loss of the first downlink channel and the second parameter indicates the insertion loss of the second downlink channel. Based on the first parameter, the second parameter, and the first transmit power, the system determines the second transmit power, which refers to the transmit power of the terminal device when transmitting SRS through the second uplink channel. Based on the second transmit power, the system transmits SRS through the second uplink channel in the second symbol. When the first symbol transmits SRS, the second downlink channel is in a conducting state, ensuring that the signal sensed by the second downlink channel does not interfere with the SRS currently transmitted through the first uplink channel. Similarly, when the second symbol transmits SRS, the first downlink channel is in a conducting state, ensuring that the signal sensed by the first downlink channel does not interfere with the SRS currently transmitted through the second uplink channel. This effectively improves the reciprocity between the uplink and downlink channels, thereby improving the accuracy of the channel estimation between the network device and the terminal device obtained by the network device based on the SRS transmitted through the uplink channel.

[0185] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0186] It is understood that, in order to achieve the above functions, the electronic device includes hardware and / or software modules that perform the respective functions. Based on the algorithmic steps of the examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is implemented in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application in conjunction with the embodiments, but such implementation should not be considered beyond the scope of this application.

[0187] This application embodiment can divide an electronic device into functional modules based on the above method examples. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one module. It should be noted that the module division in this application embodiment is illustrative and represents only one logical functional division; other division methods may be used in actual implementation. It should also be noted that the module names in this application embodiment are illustrative, and the names of the modules are not limited in actual implementation.

[0188] Figure 18 This is a schematic diagram of a channel sounding reference signal (SRS) transmitting apparatus provided in an embodiment of this application.

[0189] It should be understood that the channel sounding reference signal (SRS) transmitting device 600 can perform... Figures 12 to 17 The method for transmitting a channel sounding reference signal (SRS) is shown. The SRS transmitting apparatus 600 includes an acquisition unit 610 and a processing unit 620.

[0190] Processing unit 620 is used to transmit the SRS in the first uplink channel using a first transmit power, wherein the first transmit power refers to the preset transmit power when the terminal device transmits the SRS;

[0191] The acquisition unit 610 is used to acquire a first parameter and a second parameter, wherein the first parameter is used to indicate the insertion loss of the first downlink channel and the second parameter is used to indicate the insertion loss of the second downlink channel;

[0192] Processing unit 620 is used to determine a second transmission power based on the first parameter, the second parameter and the first transmission power, wherein the second transmission power refers to the transmission power of the terminal device when transmitting the SRS through the second uplink channel;

[0193] The processing unit 620 is used to transmit the SRS in the second uplink channel using the second transmit power.

[0194] In one embodiment, when the SRS is transmitted through the first uplink channel, the switch state of the second switch is a state indicating that the second downlink channel is on.

[0195] In one embodiment, when the SRS is transmitted through the second uplink channel, the switch state of the first switch is a state indicating that the first downlink channel is on.

[0196] In one embodiment, the processing unit 620 is specifically used to obtain the difference between the first parameter and the second parameter; and to obtain the second transmission power based on the difference and the first transmission power.

[0197] In one embodiment, the processing unit 620 is specifically used to obtain the maximum transmit power corresponding to the second uplink channel; adjust the first transmit power based on the difference to obtain a third transmit power; and obtain the second transmit power based on the third transmit power and the maximum transmit power.

[0198] In one embodiment, the processing unit 620 is specifically configured to, when the third transmission power is greater than the maximum transmission power, use the second transmission power as the maximum transmission power; and when the third transmission power is less than or equal to the maximum transmission power, use the second transmission power as the third transmission power.

[0199] In one embodiment, the first parameter includes the sensitivity of the first downlink channel.

[0200] In one embodiment, the second parameter includes the sensitivity of the second downlink channel.

[0201] In one embodiment, the terminal device further includes an RFIC (Radio Frequency Identifier);

[0202] Processing unit 620 is used to transmit the SRS with a first transmit power through the first uplink channel using the first symbol;

[0203] Processing unit 620 is used to transmit the SRS using a second transmit power through the second uplink channel via the second symbol;

[0204] Wherein, the first symbol and the second symbol are adjacent symbols indicated by a first order, which is generated by the RFIC.

[0205] In one embodiment, the number of the second channels is at least two, and correspondingly, the number of the second symbols is at least two, and the first order is also used to indicate the order of each of the second symbols.

[0206] The channel sounding reference signal (SRS) transmitting apparatus provided in this embodiment is used to execute the channel sounding reference signal (SRS) transmitting method of the above embodiment. The technical principle and technical effect are similar, and will not be described again here.

[0207] It should be noted that the aforementioned channel sounding reference signal (SRS) transmitting device 600 is embodied in the form of a functional unit. The term "unit" here can be implemented in software and / or hardware, without specific limitations.

[0208] For example, a "unit" can be a software program, a hardware circuit, or a combination of both that implements the above functions. The hardware circuit may include an application-specific integrated circuit (ASIC), electronic circuitry, a processor (e.g., a shared processor, a proprietary processor, or a group processor) and memory for executing one or more software or firmware programs, integrated logic circuitry, and / or other suitable components that support the described functions.

[0209] Therefore, the units of the various examples described in the embodiments of this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art 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.

[0210] Figure 19 A schematic diagram of the structure of an electronic device provided in this application is shown. Figure 19 The dashed lines indicate that the unit or module is optional. The electronic device 700 can be used to implement the channel sounding reference signal (SRS) transmission method described in the above method embodiments.

[0211] The electronic device 700 includes one or more processors 701, which support the implementation of the channel sounding reference signal (SRS) transmission method in the method embodiments of the electronic device 700. The processor 701 can be a general-purpose processor or a special-purpose processor. For example, the processor 701 can be a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, such as discrete gates, transistor logic devices, or discrete hardware components.

[0212] The processor 701 can be used to control the electronic device 700, execute software programs, and process data from the software programs. The electronic device 700 may also include a communication unit 705 for inputting (receiving) and outputting (transmitting) signals.

[0213] For example, electronic device 700 may be a chip, communication unit 705 may be the input and / or output circuit of the chip, or communication unit 705 may be the communication interface of the chip, and the chip may be a component of terminal device or other electronic device.

[0214] For example, electronic device 700 can be a terminal device, communication unit 705 can be the transceiver of the terminal device, or communication unit 705 can be the transceiver circuit of the terminal device.

[0215] The electronic device 700 may include one or more memories 702, which store a program 704. The program 704 can be executed by the processor 701 to generate instructions 703, causing the processor 701 to execute the impedance matching method described in the above method embodiments according to the instructions 703.

[0216] Optionally, the memory 702 may also store data. Optionally, the processor 701 may also read the data stored in the memory 702, which may be stored at the same memory address as the program 704, or the data may be stored at a different memory address than the program 704.

[0217] The processor 701 and memory 702 can be configured separately or integrated together; for example, integrated on the system on chip (SOC) of the terminal device.

[0218] For example, the memory 702 can be used to store the relevant program 704 of the channel sounding reference signal (SRS) transmission method provided in the embodiments of this application. The processor 701 can be used to call the relevant program 704 of the channel sounding reference signal (SRS) transmission method stored in the memory 702 when transmitting the SRS, and execute the channel sounding reference signal (SRS) transmission method of the embodiments of this application; including: transmitting the SRS in the first uplink channel using a first transmit power, the first transmit power being a preset transmit power when the terminal device transmits the SRS; obtaining a first parameter and a second parameter, the first parameter being used to indicate the insertion loss of the first downlink channel, and the second parameter being used to indicate the insertion loss of the second downlink channel; determining a second transmit power based on the first parameter, the second parameter, and the first transmit power, the second transmit power being the transmit power when the terminal device transmits the SRS through the second uplink channel; and transmitting the SRS in the second uplink channel using the second transmit power.

[0219] This application also provides a computer program product that, when executed by processor 701, implements the method for transmitting Channel Sounding Reference Signal (SRS) as described in any of the method embodiments of this application.

[0220] The computer program product can be stored in memory 702, for example, program 704. Program 704 is finally converted into an executable object file that can be executed by processor 701 after processing such as preprocessing, compilation, assembly and linking.

[0221] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a computer, implements the method for transmitting a Channel Sounding Reference Signal (SRS) as described in any of the method embodiments of this application. The computer program may be a high-level language program or an executable object program.

[0222] The computer-readable storage medium is, for example, memory 702. Memory 702 can be volatile memory or non-volatile memory, or memory 702 can include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0223] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0224] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0225] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art 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.

[0226] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0227] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for example, the division of units is merely a logical functional division, and other division methods may exist in actual implementation; for example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0228] The units described as separate components may or may not be physically separate. 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 the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0229] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0230] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for transmitting a channel sounding reference signal (SRS), the method comprising: The method is applied to a terminal device that communicates with a network device. The terminal device includes a first channel and a second channel. The first channel includes a first uplink channel and a first downlink channel. The first uplink channel includes a first power amplifier, a first switch, and a first antenna. The first downlink channel includes the first antenna, the first switch, and a first low-noise amplifier. The first switch is configured to transmit the signal amplified by the first power amplifier to the first antenna and transmit it out through the first antenna. Furthermore, the first switch is also configured to transmit the signal received by the first antenna to the terminal device through the first low-noise amplifier. The second channel includes a second uplink channel and a second downlink channel. The second uplink channel includes a second power amplifier, a second switch, and a second antenna. The second downlink channel includes a second antenna, a second switch, and a second low-noise amplifier. The second switch is configured to transmit the signal amplified by the second power amplifier to the second antenna and transmit it out through the second antenna. Furthermore, the second switch is configured to transmit the signal received by the second antenna to the terminal device through the second low-noise amplifier. The terminal device transmits the SRS (Signal Reference Signal) through the first uplink channel or the second uplink channel. The SRS is a reference signal used for channel estimation. The terminal device also includes an RFIC (Radio Frequency Identifier). The method includes: The first symbol transmits the first SRS through the first antenna. The transmit power of the terminal device when transmitting the first SRS is the first transmit power. The first SRS is the SRS output through the first uplink channel. When the terminal device is in the conducting state of the first downlink channel and multiple second downlink channels, it measures a first parameter and a second parameter corresponding to each second downlink channel. The first parameter is the sensitivity and / or noise figure of the first downlink channel, and each second parameter is the sensitivity and / or noise figure of a corresponding second downlink channel. Calculate the difference between the first parameter and the plurality of second parameters respectively to obtain a plurality of first differences; Based on the plurality of first differences and the first transmission power, a plurality of second transmission powers corresponding to the plurality of second parameters are obtained respectively, and each second transmission power is used to represent the transmission power when the terminal device sends the corresponding second SRS output by the second uplink channel; The second symbol transmits a second SRS through the second antenna, wherein the first symbol and the second symbol are adjacent symbols indicated by a first order, which is generated by the RFIC.

2. The method of claim 1, wherein, When the SRS is transmitted through the first uplink channel, the switch state of the second switch is such that the second downlink channel is on.

3. The method according to claim 1 or 2, characterized in that, When the SRS is transmitted through the second uplink channel, the switch of the first switch is in a state indicating that the first downlink channel is on.

4. The method according to claim 1 or 2, characterized in that, Determining the second transmission power based on the first parameter, the second parameter, and the first transmission power includes: Obtain the difference between the first parameter and the second parameter; The second transmission power is obtained based on the difference and the first transmission power.

5. The method of claim 4, wherein, The step of obtaining the second transmission power based on the difference and the first transmission power includes: Obtain the maximum transmit power corresponding to the second uplink channel; The first transmission power is adjusted based on the difference to obtain the third transmission power; The second transmission power is obtained based on the third transmission power and the maximum transmission power.

6. The method of claim 5, wherein, The step of obtaining the second transmission power based on the third transmission power and the maximum transmission power includes: If the third transmission power is greater than the maximum transmission power, the second transmission power is the maximum transmission power; When the third transmission power is less than or equal to the maximum transmission power, the second transmission power is the third transmission power.

7. The method according to claim 1 or 2, characterized in that, The first parameter is the sensitivity of the first downlink channel.

8. The method of claim 1 or 2, wherein, The second parameter is the sensitivity of the second downlink channel.

9. The method of claim 1 or 2, wherein, The number of the second channels is at least two, and correspondingly, the number of the second symbols is at least two. The first order is also used to indicate the order of each of the second symbols.

10. A means for transmitting a channel sounding reference signal (SRS), characterized in that, The apparatus includes a processor and a memory for storing a computer program, and the processor for calling and running the computer program from the memory, such that the apparatus performs the method of any one of claims 1 to 9.

11. A chip, characterized in that, Includes a processor, which, when executing instructions, performs the method as described in any one of claims 1 to 9.

12. An electronic device, characterized in that, The electronic device includes a processor configured to be coupled to a memory, read instructions from the memory, and cause the electronic device to perform the method as described in any one of claims 1 to 9 according to the instructions.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, causes the processor to perform the method of any one of claims 1 to 9.

Images