Power calibration method, electronic device and computer program product

Abstract

The present disclosure provides a power calibration method, comprising: a terminal receiving at least one group of power calibration reference signals from a base station, each group of power calibration reference signals corresponding to an uplink; the terminal determines a downlink frequency point power calibration value corresponding to each group of power calibration reference signals by measuring each group of power calibration reference signals, and determines an uplink frequency point power calibration value corresponding to each group of power calibration reference signals according to the downlink frequency point power calibration value corresponding to each group of power calibration reference signals; and the terminal sends an uplink signal on an uplink corresponding to each group of power calibration reference signals based on the uplink frequency point power calibration value corresponding to each group of power calibration reference signals so as to calibrate the uplink frequency point power. The disclosure also provides an electronic device and a computer program product.

Description

Power calibration methods, electronic devices and computer program products Technical Field

[0001] This disclosure relates to the field of mobile communication technology, and in particular to a power calibration method, electronic device, and computer program product. Background Technology

[0002] In a Time Division Duplex (TDD) communication system, the uplink and downlink use the same frequency band to transmit information, but they are transmitted in different time slots to ensure the separation of the uplink and downlink.

[0003] Since the uplink and downlink in a TDD communication system share the same frequency band, the channel fading experienced by the transmitted signals in the uplink and downlink can be considered to be the same within a relatively short period of time (the coherence time of channel propagation). Therefore, the uplink and downlink of a TDD communication system have channel reciprocity.

[0004] With the development of communication technology, the operating frequency band of TDD communication systems is becoming increasingly larger. When a terminal sends an uplink signal to the base station via the uplink, the in-band flatness of the signal is poor when it reaches the base station due to multipath effects and antenna performance. Typically, the modulation and coding scheme (MCS) needs to be reduced to lower the demodulation threshold to demodulate the signal, which reduces the uplink rate. Furthermore, when flatness is poor, the base station may instruct the terminal to increase its transmit power to alleviate the flatness problem, but this increases the terminal's energy consumption, thereby increasing the network's operating costs. Summary of the Invention

[0005] This disclosure provides a power calibration method, an electronic device, and a computer program product.

[0006] In a first aspect, embodiments of this disclosure provide a power calibration method, comprising: a terminal receiving at least one set of power calibration reference signals from a base station, each set of power calibration reference signals corresponding to an uplink; the terminal determining a downlink frequency power calibration value corresponding to each set of power calibration reference signals by measuring each set of power calibration reference signals, and determining an uplink frequency power calibration value corresponding to each set of power calibration reference signals based on the downlink frequency power calibration value corresponding to each set of power calibration reference signals; and the terminal transmitting an uplink signal on the uplink corresponding to each set of power calibration reference signals based on the uplink frequency power calibration value corresponding to each set of power calibration reference signals to calibrate the uplink frequency power.

[0007] Secondly, embodiments of this disclosure provide another power calibration method, which includes: a base station sending at least one set of power calibration reference signals to a terminal, each set of power calibration reference signals corresponding to an uplink of the terminal; the base station receiving uplink signals sent by the terminal on the uplink corresponding to each set of power calibration reference signals, the uplink signals being sent based on uplink frequency point power calibration values ​​corresponding to each set of power calibration reference signals, the uplink frequency point power calibration values ​​being determined according to downlink frequency point power calibration values ​​corresponding to each set of power calibration reference signals, and the downlink frequency point power calibration values ​​being determined according to each set of power calibration reference signals.

[0008] Thirdly, embodiments of this disclosure provide an electronic device including a memory and a processor; the memory stores a computer program executable by the processor, and when the computer program is executed by the processor, it implements the first aspect and any possible embodiment of the first aspect or the second aspect and any possible embodiment of the second aspect.

[0009] Fourthly, embodiments of this disclosure provide a computer-readable medium having a computer program stored thereon, which, when executed by a processor, implements the first aspect and any possible embodiments thereof, or the second aspect and any possible embodiments thereof.

[0010] Fifthly, embodiments of this disclosure provide a computer program product, which includes a computer program that, when executed by a processor, implements the first aspect and any possible embodiment of the first aspect, or the second aspect and any possible embodiment of the second aspect.

[0011] In this embodiment, the terminal receives at least one set of power calibration reference signals from a base station. Each set of power calibration reference signals corresponds to an uplink. The terminal determines the downlink frequency power calibration value corresponding to each set of power calibration reference signals by measuring them. Based on the downlink frequency power calibration value, the terminal determines the uplink frequency power calibration value corresponding to each set of power calibration reference signals. Based on the uplink frequency power calibration value, the terminal transmits an uplink signal on the uplink corresponding to each set of power calibration reference signals to calibrate the uplink frequency power, thereby improving the in-band flatness of uplink transmission, optimizing the uplink rate, and avoiding increased terminal power consumption, thus avoiding increased network operating costs. Furthermore, when the terminal receives multiple sets of power calibration reference signals, different power calibration reference signals correspond to different uplink links. The method of this embodiment can perform differentiated calibration for uplink signal concurrency scenarios. Attached Figure Description

[0012] In the accompanying drawings of the embodiments disclosed herein:

[0013] Figure 1 is a communication system architecture diagram provided in an embodiment of this disclosure;

[0014] Figure 2 is a flowchart of a power calibration method provided in an embodiment of this disclosure;

[0015] Figure 3 is a flowchart of another power calibration method provided in an embodiment of this disclosure;

[0016] Figure 4 is a flowchart of another power calibration method provided in an embodiment of this disclosure;

[0017] Figure 5 is a block diagram of a base station structure provided in an embodiment of this disclosure;

[0018] Figure 6 is a block diagram of a terminal structure provided in an embodiment of this disclosure;

[0019] Figure 7 is a schematic diagram of a beam configuration provided in an embodiment of this disclosure;

[0020] Figure 8 is a schematic diagram of another beam configuration provided in an embodiment of this disclosure;

[0021] Figure 9 is a schematic diagram of the frequency domain distribution of a power calibration reference signal provided in an embodiment of this disclosure;

[0022] Figure 10 is a schematic diagram of the frequency domain distribution of another power calibration reference signal provided in an embodiment of this disclosure;

[0023] Figure 11 is a schematic diagram of the frequency domain distribution of an uplink signal and a power calibration reference signal provided in an embodiment of this disclosure;

[0024] Figure 12 is a schematic diagram of the time-domain distribution of a power calibration reference signal provided in an embodiment of this disclosure;

[0025] Figure 13 is a schematic diagram of the calibration timing during uplink antenna switching provided in an embodiment of this disclosure;

[0026] Figure 14 is a schematic diagram of the structure of an electronic device provided in an embodiment of this disclosure. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this disclosure, the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings.

[0028] The present disclosure will be described more fully below with reference to the accompanying drawings; however, the embodiments shown may be embodied in different forms, and the present disclosure should not be construed as limited to the embodiments set forth below. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will enable those skilled in the art to fully understand the scope of the disclosure.

[0029] The accompanying drawings of the embodiments disclosed herein are provided to further illustrate the embodiments of this disclosure and form part of the specification. They are used together with the detailed embodiments to explain this disclosure and do not constitute a limitation thereof. The above and other features and advantages will become more apparent to those skilled in the art from the description of the detailed embodiments with reference to the accompanying drawings.

[0030] Where there is no conflict, the various embodiments of this disclosure and the features thereof in the embodiments may be combined with each other.

[0031] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. The term "and / or" as used in this disclosure includes any and all combinations of one or more of the associated enumerated entries. The singular forms "a" and "the" as used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. The terms "comprising," "made of," etc., as used in this disclosure specify the presence of the stated feature, integral, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof.

[0032] Unless otherwise specified, all terms used in this disclosure (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted as having an idealized or overly formal meaning, unless expressly so defined in this disclosure.

[0033] Referring to Figure 1, a communication system architecture diagram is provided according to an embodiment of this disclosure. The communication system 100 in Figure 1 may include one or more base stations 10, and one or more terminals 20 that can access the base stations 10. Terminals 20 can access a wireless network through the base stations 10 to obtain services or communicate with other devices via the wireless network. The number of devices in the communication system shown in Figure 1 is for illustrative purposes only, and the embodiments of this disclosure are not limited thereto. Figure 1 is merely a schematic diagram and does not constitute a limitation on the applicable scenarios of the technical solutions provided in this application.

[0034] This disclosure does not limit the type of the communication system 100 shown in FIG1. ​​For example, it can be a long term evolution (LTE) system, a new radio (NR) system, a transitional system between LTE and NR (which may be called 4.5G or LTE-A), a global system for mobile communication (GSM), a code division multiple access (CDMA) system, a time division code division multiple access (TD-CDMA) system, a wideband code division multiple access (WCDMA) system, or a future evolution communication system. Additionally, it can be a hybrid network communication system combining multiple of the aforementioned systems, such as a communication system composed of LTE and NR systems.

[0035] In this embodiment of the disclosure, the communication system 100 shown in FIG1 can be a TDD communication system.

[0036] Base station 10, also known as a radio access network (RAN) node (or device) or access point, refers to the device that connects terminal 20 to the wireless network. Currently, some examples of base station 10 include: next-generation radio access network node (NG-RAN node), evolved Node B (gNB), transmission reception point (TRP), evolved Node B (eNB), radio network controller (RNC), Node B (NB), relay station, base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), base band unit (BBU), or wireless fidelity (Wi-Fi) access point (AP), etc. In another network architecture, a base station may include a centralized unit (CU) node, a distributed unit (DU) node, or a RAN device that includes both CU and DU nodes.

[0037] Terminal 20, also known as user equipment (UE), UE unit, UE device, mobile station, mobile station (MS), mobile terminal (MT), remote terminal, mobile device, etc., refers to a device that provides voice and / or data connectivity to a user. Examples include handheld devices with wireless connectivity and vehicle-mounted devices. Currently, some examples of terminals 20 include: mobile phones, cellular phones, cordless phones, session initiation protocol (SIP) phones, handheld devices with wireless communication capabilities, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes.

[0038] With the development of communication technology, fifth-generation (5G) new radio (NR) technology has been introduced into the mobile communication field. Since 5G, the operating frequency band of communication systems has been increasing, expanding from a maximum of 20MHz in 4G channels to a maximum of 100MHz in 5G NR. When a terminal sends an uplink signal to a base station via the uplink, although the terminal's radio frequency signal has good in-band flatness when inputting to the uplink, the uplink signal, after propagating through the air interface, suffers from multipath effects and antenna performance, resulting in poor in-band flatness when it reaches the base station. This leads to high power at some frequency points and low power at others. The uplink signal within a specific time slot is a whole; if the information carried by some frequency points cannot be demodulated, the information in the entire time slot will also be unable to be demodulated. Typically, it is necessary to reduce the modulation and coding scheme (MCS) to lower the demodulation threshold in order to demodulate the uplink signal, which will reduce the uplink rate. Furthermore, when the flatness is poor, if the uplink power of the terminal does not reach the maximum power, the base station may schedule the terminal to increase the transmit power to improve the transmit power and signal-to-noise ratio (SNR) of the entire frequency band in order to alleviate the flatness problem. However, this will significantly increase the power consumption of the terminal, thereby increasing the operating cost of the network.

[0039] In view of this, the power calibration method, electronic device, and computer program product provided in this disclosure can be applied to the communication system 100 shown in FIG1, which can be a TDD communication system. A detailed description is provided below with reference to the accompanying drawings.

[0040] Firstly, referring to FIG2, this disclosure provides a flowchart of a power calibration method. This method can be applied to a terminal in a TDD communication system. The terminal can be terminal 20 as shown in FIG1. ​​The method includes:

[0041] S201: The terminal receives at least one set of power calibration reference signals from the base station, and each set of power calibration reference signals corresponds to an uplink.

[0042] In this embodiment of the disclosure, the terminal can be a terminal in a TDD communication system, which uses the TDD frequency band when operating. Unless otherwise specified, the frequency band mentioned in this disclosure refers to the TDD frequency band. In this disclosure, frequency band can also be described as bandwidth.

[0043] In this embodiment of the disclosure, each set of power calibration reference signals corresponds to one uplink, which can be understood as the set of power calibration reference signals being used to calibrate the power of its corresponding uplink.

[0044] In this embodiment of the disclosure, the power calibration reference signal has the same amplitude in the frequency domain.

[0045] S202: The terminal determines the downlink frequency power calibration value corresponding to each set of power calibration reference signals by measuring each set of power calibration reference signals, and determines the uplink frequency power calibration value corresponding to each set of power calibration reference signals based on the downlink frequency power calibration value corresponding to each set of power calibration reference signals.

[0046] For example, in S202, the uplink frequency power calibration value corresponding to each group of power calibration reference signals is determined based on the downlink frequency power calibration value corresponding to each group of power calibration reference signals. This can be done based on the channel reciprocity of the uplink and downlink of the TDD communication system, by determining the downlink frequency power calibration value corresponding to each group of power calibration reference signals as the uplink frequency power calibration value corresponding to each group of power calibration reference signals.

[0047] S203: The terminal sends an uplink signal on the uplink corresponding to each set of power calibration reference signals based on the uplink frequency power calibration value corresponding to each set of power calibration reference signals, in order to calibrate the uplink frequency power.

[0048] In this embodiment, the terminal receives at least one set of power calibration reference signals from a base station. Each set of power calibration reference signals corresponds to an uplink. The terminal determines the downlink frequency power calibration value corresponding to each set of power calibration reference signals by measuring them. Based on the downlink frequency power calibration value, the terminal determines the uplink frequency power calibration value corresponding to each set of power calibration reference signals. Based on the uplink frequency power calibration value, the terminal transmits an uplink signal on the uplink corresponding to each set of power calibration reference signals to calibrate the uplink frequency power, thereby improving the in-band flatness of uplink transmission, optimizing the uplink rate, and avoiding increased terminal power consumption, thus avoiding increased network operating costs. Furthermore, when the terminal receives multiple sets of power calibration reference signals, different power calibration reference signals correspond to different uplink links. The method of this embodiment can perform differentiated calibration for uplink signal concurrency scenarios.

[0049] It is understandable that, given the large operating frequency band of TDD communication systems, the uplink signal is significantly affected by multipath effects and antenna performance, resulting in poor in-band flatness when the uplink signal reaches the base station. When the method provided in this embodiment is applied to a TDD communication system, the channel reciprocity of the uplink and downlink of the TDD communication system can be utilized to determine the uplink frequency power calibration value through the downlink frequency power calibration value, thereby calibrating the uplink frequency power and improving the in-band flatness of uplink transmission. This optimizes the uplink rate of the TDD communication system and avoids increasing the terminal power consumption of the TDD communication system.

[0050] In some possible embodiments, determining the downlink frequency power calibration value corresponding to each group of power calibration reference signals in S202 can be achieved as follows: determining the power of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals; determining the average power of the frequency points based on the power of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals; determining the frequency power calibration value of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals based on the power of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals and the average power of the frequency points; and determining the frequency power calibration value of each frequency point in the downlink frequency band as the downlink frequency power calibration value corresponding to each group of power calibration reference signals.

[0051] In some possible embodiments, the frequency power calibration value of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals can be determined based on the power of each frequency point and the average power of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals in the following manner:

[0052] Method 1: When the absolute difference between the power of the intermediate frequency point in the downlink frequency band and the average power of the frequency point is less than the preset power deviation threshold, determine the frequency point power calibration value of the intermediate frequency point in the downlink frequency band occupied by each group of power calibration reference signals based on the power of the intermediate frequency point in the downlink frequency band and the average power of the frequency point.

[0053] Method 2: When the absolute difference between the power of the intermediate frequency point in the downlink frequency band and the average power of the frequency point is greater than or equal to the preset power deviation threshold, the frequency point power calibration value of the intermediate frequency point in the downlink frequency band occupied by each group of power calibration reference signals is determined based on the power of the intermediate frequency point in the downlink frequency band occupied by each group of power calibration reference signals, the average power of the frequency point, and at least one preset calibration coefficient. Each preset calibration coefficient is a value greater than 0 and less than 1.

[0054] Using the above method, by setting a preset power deviation threshold, the frequency point power calibration value can be determined for frequency points with small power deviation and frequency points with large power deviation respectively. For frequency points with large power deviation, a preset calibration coefficient of less than 1 is set, and the frequency point power calibration value is determined according to the preset calibration coefficient. In this way, by reducing the calibration coefficient of frequency points with large power deviation, it is more conducive to the system to achieve power calibration.

[0055] In some possible embodiments, each set of power calibration reference signals is uniformly distributed in the frequency domain across the frequency band of its corresponding link. This uniform distribution can be understood as each set of power calibration reference signals uniformly covering the entire frequency band of its corresponding link. For example, the frequency domain resource density occupied by each set of power calibration reference signals in its corresponding link's frequency band is adjustable. The frequency domain resources can be, for example, the frequency domain resources corresponding to a resource block (RB) or a resource element (RE). The frequency domain resource density occupied by each set of power calibration reference signals in its corresponding link's frequency band can be adjusted according to the actual application. For example, when system resources are sufficient, the frequency domain resource density occupied by each set of power calibration reference signals in its corresponding link's frequency band can be increased to improve calibration accuracy; conversely, when system resources are insufficient, the frequency domain resource density occupied by each set of power calibration reference signals in its corresponding link's frequency band can be decreased, maximizing the conservation of system resources occupied by the power calibration reference signals.

[0056] By using the method described in the above embodiments, by covering the entire frequency band of the corresponding link with each set of power calibration reference signals, power compensation can be performed on the frequency points in the entire frequency band, which can improve the accuracy of power calibration and solve the power unevenness problem to the greatest extent.

[0057] In some possible embodiments, the link configuration parameters used for the transmitted power calibration reference signal are the same as those used for the transmitted uplink signal. These link configuration parameters include at least one of the beamforming parameters of the beam associated with the link and the antenna configuration parameters of the antenna associated with the link. Thus, by keeping the link configuration parameters used for the transmitted power calibration reference signal consistent with those used for the transmitted uplink signal, uplink / downlink channel reciprocity can be ensured.

[0058] In some possible embodiments, the sum of the downlink frequency power calibration values ​​corresponding to each set of power calibration reference signals is 0, and the sum of the uplink frequency power calibration values ​​corresponding to each set of power calibration reference signals is 0. Thus, by setting the sum of the downlink frequency power calibration values ​​corresponding to each set of power calibration reference signals to 0, and setting the sum of the uplink frequency power calibration values ​​corresponding to each set of power calibration reference signals to 0, the total power before and after calibration remains unchanged, without requiring changes to the power control algorithm. This is easy to implement and ensures system performance and stability.

[0059] Secondly, referring to FIG3, this disclosure provides another power calibration method flowchart, which can be applied to a base station in a TDD communication system. The base station can be base station 10 in FIG1. ​​The method includes:

[0060] S301: The base station sends at least one set of power calibration reference signals to the terminal, and each set of power calibration reference signals corresponds to one uplink of the terminal.

[0061] For example, a base station can send a power calibration reference signal to a terminal through a special slot (S SLOT). For instance, the base station can preferentially select a position in the S SLOT that is close to the uplink signal to carry the power calibration reference signal.

[0062] For example, the base station can send at least one set of power calibration reference signals to the terminal according to a preset period. In this implementation, the base station can send the preset period to the terminal through Radio Resource Control (RRC) signaling, and the terminal can periodically receive and demodulate at least one set of power calibration reference signals to perform power calibration.

[0063] For example, when the base station transmits at least one set of power calibration reference signals aperiodically, it can notify the terminal of the time slot number carrying the power calibration reference signals through downlink control information (DCI), so that the terminal can demodulate the power calibration reference signals.

[0064] S302: The uplink signal transmitted by the base station receiving terminal on the uplink corresponding to each group of power calibration reference signals. The uplink signal is transmitted based on the uplink frequency power calibration value corresponding to each group of power calibration reference signals. The uplink frequency power calibration value is determined according to the downlink frequency power calibration value corresponding to each group of power calibration reference signals. The downlink frequency power calibration value is determined according to each group of power calibration reference signals.

[0065] In this embodiment, the base station sends at least one set of power calibration reference signals to the terminal and receives uplink signals sent by the terminal on the uplink corresponding to each set of power calibration reference signals. The uplink signals are sent based on the uplink frequency power calibration value corresponding to each set of power calibration reference signals. The uplink frequency power calibration value is determined based on the downlink frequency power calibration value corresponding to each set of power calibration reference signals. The downlink frequency power calibration value is determined based on each set of power calibration reference signals to calibrate the uplink frequency power, thereby improving in-band flatness, optimizing uplink speed, and avoiding increased terminal power consumption, thus avoiding increased network operating costs. Furthermore, when the base station sends multiple sets of power calibration reference signals, different power calibration reference signals correspond to different uplink links. This method can perform differentiated calibration for uplink signal concurrency scenarios.

[0066] It should be noted that the same concepts or steps involved in the second aspect as those in the first aspect can be found in the description of the first aspect, and will not be repeated in the second aspect.

[0067] In some possible embodiments, the base station in S301 sending at least one set of power calibration reference signals to the terminal can be implemented as follows: the base station sends at least one set of power calibration reference signals to the terminal through at least one port, each port corresponding to an uplink, and each port is used to send one set of power calibration reference signals. When there are multiple sets of power calibration reference signals, any two sets of power calibration reference signals occupy different time-frequency resources. In this way, by configuring a port for each set of power calibration reference signals, the power calibration reference signals used for each uplink can be distinguished, and the frequency power of each uplink can be calibrated more accurately, thereby improving the accuracy of power calibration and enhancing the transmission management of the uplink.

[0068] In some possible embodiments, before executing S301, the base station may also perform the following steps: If the base station determines that the proportion of target data packets among the data packets received from the terminal via the uplink within a first preset time period is greater than a first preset ratio, and determines that the proportion of uplink signals transmitted by the terminal via the uplink within a second preset time period whose in-band flatness evaluation value is greater than a preset flatness evaluation threshold is greater than a second preset ratio, a calibration trigger command is generated, and a power calibration reference signal is sent to the terminal based on the calibration trigger command; wherein the number of resource blocks occupied by the target data packets is greater than a preset number of resource blocks. In this way, the base station can trigger the sending of a power calibration reference signal to the terminal for calibration when it determines that the terminal is transmitting a high-bandwidth service and the in-band flatness is poor, ensuring that calibration is triggered when the signal quality is poor, thereby improving resource utilization.

[0069] In some possible embodiments, after the base station triggers the sending of a power calibration reference signal to the terminal based on the calibration trigger command, it may also perform the following steps: if the base station determines that at least one of the following conditions 1 and 2 is met, it generates an exit calibration command, which is used to indicate that the uplink frequency power calibration value is disabled or discarded; the base station sends the exit calibration command to the terminal so that the terminal disables or discards the uplink frequency power calibration value based on the exit calibration command.

[0070] Condition 1: The proportion of the target data packet in the data packets received within the preset time is less than or equal to the preset ratio;

[0071] Condition 2: The in-band flatness evaluation value of the uplink signal transmitted through the uplink is less than or equal to the preset flatness evaluation threshold.

[0072] Using the method described in the above embodiments, the base station can trigger calibration exit when it determines that the terminal is not transmitting high-bandwidth services and / or that the in-band flatness is good. This ensures that calibration exit is triggered when the signal quality improves, thus avoiding resource waste.

[0073] In some possible embodiments, the in-band flatness assessment includes the maximum power deviation of the uplink signal at each of the multiple frequency points it occupies, or the standard deviation of the power of the uplink signal at all the multiple frequency points it occupies, with the power deviation at each frequency point determined based on the power at each frequency point and the average power at all frequencies.

[0074] To enable those skilled in the art to more clearly understand the technical solutions provided by the embodiments of this disclosure, the technical solutions provided by the embodiments of this disclosure will be further described below through specific embodiments:

[0075] Referring to Figure 4, a flowchart of another power calibration method provided in this disclosure is shown. This method is applied to a TDD communication system, which may include a base station and a terminal. The base station may be base station 10 in Figure 1, and the terminal may be terminal 20 in Figure 1. The method includes:

[0076] Step S1: The base station receives uplink signals from the terminal. These uplink signals are transmitted via the uplink link.

[0077] It should be noted that this embodiment can be applied to scenarios where the base station and the terminal transmit uplink signals through multiple uplinks for power calibration. For clarity, this embodiment is described using the example of the base station and the terminal transmitting uplink signals through one uplink for power calibration. When power calibration is performed by transmitting uplink signals through multiple uplinks, the power calibration of each uplink can be implemented with reference to this method.

[0078] For example, Figure 5 shows a base station structure block diagram, and the method of this embodiment can be applied to, but is not limited to, the base station structure shown in Figure 5.

[0079] For example, FIG6 shows a terminal structure block diagram, and the method of this embodiment can be applied to, but is not limited to, the terminal structure shown in FIG6.

[0080] Step S2: The base station determines whether the uplink signal power calibration conditions are met. If the uplink signal power calibration conditions are met, then proceed to step S3. If the uplink signal power calibration conditions are not met, then the process ends.

[0081] For example, if the base station determines that the proportion of target data packets among the data packets received from the terminal via the uplink within a first preset time period is greater than a first preset ratio, and determines that the proportion of uplink signal in-band flatness evaluation values ​​transmitted by the terminal via the uplink within a second preset time period that are greater than a preset flatness evaluation threshold is greater than a second preset ratio, then the uplink signal power calibration condition is determined to be met, wherein the number of resource blocks occupied by the target data packets is greater than a preset number of resource blocks. It can be understood that this step can be performed by the base station baseband unit and / or base station control unit in Figure 5. An example is provided below for illustration.

[0082] In one example, the first preset time is 1 second, the first preset ratio is 50%, and the preset number of resource blocks is 50RB. When the base station determines that the proportion of the target data packet (the number of resource blocks occupied by the target data packet is greater than 50RB) in the data packets received from the terminal through the uplink within 1 second is greater than 50%, it can be understood that the uplink service transmitted by the terminal is a high-bandwidth service. High-bandwidth services are greatly affected by in-band flatness. Therefore, in this case, the base station can start in-band flatness assessment. When it is determined that the in-band flatness is poor, uplink power calibration can be started.

[0083] In one example, the second preset time is 100 milliseconds and the second preset ratio is 40%. When the base station determines that the proportion of the in-band flatness evaluation value of the uplink signal transmitted by the terminal through the uplink within 100 milliseconds that is greater than the preset flatness evaluation threshold is greater than 40%, it can determine that the in-band flatness is poor at this time and can start uplink power calibration.

[0084] For example, the in-band flatness assessment value can be the maximum power deviation of the uplink signal (such as an uplink data packet) at each of its multiple occupied frequency points, where the power deviation at each frequency point is determined based on the power at each frequency point and the average power across all frequency points. The in-band flatness assessment value can also be the standard deviation of the power of the uplink signal across all its multiple occupied frequency points. This will be illustrated with examples below.

[0085] In one example, taking the N41 band in a 5G NR TDD communication system as an example, the bandwidth corresponding to N41 is 100MHz, the subcarrier bandwidth is 30KHz, one subcarrier is occupied in one RE frequency domain, and 12 subcarriers are occupied in one RB frequency domain. There are 273 RBs in the frequency domain within the 100MHz band. The uplink signal occupies a certain uplink time slot using RB0-RB99. The base station can obtain the power P0 to P99 at 99 frequency points by measuring the power on each RB from RB0 to RB99. The average power of P0 to P99 is denoted as Pavg. The power deviation at each frequency point can be determined by the following formula 1, and the standard deviation of the power can be determined by the following formula 2:

[0086] Formula 1: Frequency power deviation = |Pi - Pavg|;

[0087] Formula 2:

[0088] It is understandable that the larger the maximum value or standard deviation of the power deviation, the worse the in-band flatness. When the maximum value or standard deviation of the power deviation exceeds the preset flatness evaluation threshold, the base station initiates uplink power calibration.

[0089] It is understandable that after determining that the uplink signal power calibration conditions are not met, the base station generates an exit calibration command and sends an exit calibration command to the terminal so that the terminal can disable or discard the uplink frequency power calibration value based on the exit calibration command.

[0090] Step S3: The base station generates a calibration trigger command and sends a power calibration reference signal to the terminal based on the calibration trigger command.

[0091] For example, the link configuration parameters used by the base station to transmit the power calibration reference signal are the same as those used to receive the uplink signal. The link configuration parameters include at least one of the beamforming parameters of the link-associated beam and the antenna configuration parameters of the link-associated antenna.

[0092] For example, when the base station supports beamforming, the beamforming parameters used for transmitting the power calibration reference signal can be configured to be the same as those used for receiving the uplink signal. In one example, referring to FIG7, a beam configuration diagram provided by an embodiment of this disclosure shows that when the terminal has two uplinks, the base station uses two ports to transmit power calibration reference signals corresponding to the two uplinks respectively. In this case, two beams are configured to ensure that the beamforming parameters used for transmitting the power calibration reference signal are the same as those used for receiving the uplink signal. In another example, referring to FIG8, a beam configuration diagram provided by an embodiment of this disclosure shows that when the terminal has four uplinks, the base station uses four ports to transmit power calibration reference signals corresponding to the four uplinks respectively. In this case, four beams are configured to ensure that the beamforming parameters used for transmitting the power calibration reference signal are the same as those used for receiving the uplink signal.

[0093] For example, if the base station does not support beamforming, the antenna configuration parameters used for transmitting power calibration reference signals can be configured to be the same as those used for receiving uplink signals, such as configuring the same number of antennas and physical channels.

[0094] For example, taking the scenario shown in Figure 6 as an example, the antenna ports of uplink TX0 and TX1 are ANT0 and ANT1, respectively. The base station uses two beams to receive the uplink signals of uplink TX0 and TX1. When the base station uses the two ports configured for ANT0 and ANT1 to send the power calibration reference signal, the number of antennas and physical channels used are consistent with those used when receiving the uplink signal, and the beamforming parameters are also the same as those used when receiving the uplink signal. That is, the uplink signal and the power calibration reference signal use the same two beams to transmit and receive, so as to ensure that the uplink and downlink channels are reciprocal.

[0095] For example, the base station control unit in Figure 5 can generate a calibration trigger command and send the calibration trigger command to the base station baseband unit. After receiving the calibration trigger command, the base station baseband unit maps the power calibration reference signal to the downlink signal. The base station transmitter outputs the radio frequency signal containing the power calibration reference signal to the base station antenna unit. The base station antenna unit can adjust the link configuration parameters according to the instructions of the base station control unit so that the link configuration parameters used to transmit the power calibration reference signal are the same as the link configuration parameters used to receive the uplink signal.

[0096] For example, taking the base station sending two sets of power calibration reference signals to the terminal as an example, each set of power calibration reference signals is sent through a port, each port corresponds to an uplink, and each set of power calibration reference signals occupies different time-frequency resources. Each set of power calibration reference signals is uniformly distributed in the frequency domain within the frequency band of its corresponding link (i.e., the working frequency band of the link), and the frequency domain resource density occupied by each set of power calibration reference signals in the frequency band of its corresponding link is adjustable. The uplink signal typically occupies part or all of the working bandwidth of the link, while the power calibration reference signals uniformly cover the entire working bandwidth of the link.

[0097] For example, referring to FIG9, a schematic diagram of the frequency domain distribution of a power calibration reference signal provided in an embodiment of the present disclosure is shown. FIG9 takes the transmission of two sets of power calibration reference signals through two ports as an example. Each set of power calibration reference signals occupies one RE in each RB and is evenly distributed on the frequency domain resources. Referring to FIG10, a schematic diagram of the frequency domain distribution of another power calibration reference signal provided in an embodiment of the present disclosure is shown. FIG10 takes the transmission of two sets of power calibration reference signals through two ports as an example. Each set of power calibration reference signals occupies one RE in every two RBs and is evenly distributed on the frequency domain resources. Referring to FIG11, a schematic diagram of the frequency domain distribution of an uplink signal and a power calibration reference signal provided in an embodiment of the present disclosure is shown. As can be seen from FIG11, the uplink signal (PUSCH) occupies part of the working bandwidth of the link, while the power calibration reference signal evenly covers the entire working bandwidth of the link.

[0098] For example, the power calibration reference signal can be carried in an SSLOT. Referring to FIG12, which is a schematic diagram of the time domain distribution of a power calibration reference signal provided in an embodiment of the present disclosure, the power calibration reference signal is carried in the SSLOT at a position close to the transmission uplink signal (e.g., U1), occupying one symbol of time domain resource D6.

[0099] Step S4: The terminal receives a power calibration reference signal from the base station. The power calibration reference signal corresponds to the uplink.

[0100] For example, when a terminal has multiple uplinks, as shown in Figure 6, the two uplinks of the terminal are TX0 and TX1. The terminal identifies the power calibration reference signals received by different uplinks by transmitting power calibration reference signals through different ports, and then uses the corresponding power calibration reference signals to calibrate the power of the corresponding uplink.

[0101] For example, the power calibration reference signal can be received and demodulated by the terminal RF transceiver in Figure 6, and the demodulated power calibration reference signal can be sent to the terminal baseband unit, which will then perform subsequent operations.

[0102] Step S5: The terminal determines the downlink frequency power calibration value corresponding to the power calibration reference signal by measuring the power calibration reference signal, and determines the uplink frequency power calibration value corresponding to the power calibration reference signal based on the downlink frequency power calibration value corresponding to the power calibration reference signal.

[0103] It is understandable that all uplink signals between two power calibration reference signals are calibrated using the previous power calibration reference signal.

[0104] For example, taking the frequency domain resource density occupied by the power calibration reference signal as 1 RE per port per RB as an example, each group of power calibration reference signals occupies n REs of the frequency domain resource corresponding to each port. The frequency points in the frequency band occupied by each group of power calibration reference signals are denoted as f0, f1, f2, f3...fn-1. After receiving a group of power calibration reference signals, the terminal can determine the frequency point power corresponding to the frequency points f0, f1, f2, f3...fn-1 by measuring the group of power calibration reference signals, and denoted as P0, P1, P2, P3...Pn-1 respectively. Then, the average frequency point power can be determined according to the following formula:

[0105]

[0106] It is understandable that the average power at a frequency point can also be the root mean square value of the power at that frequency point.

[0107] For example, considering that the dynamic range of the RF link is limited, the influence between frequency points will also increase when the power difference between frequency points is too large. For ease of implementation, when the power deviation from the mean of some frequency points is too large, the compensation value can be appropriately reduced, and a nonlinear algorithm can be used to determine the power calibration value of the frequency points.

[0108] In one possible implementation, if the absolute difference between the power at a frequency point in the downlink band and the average power at that frequency point is less than a preset power deviation threshold, after determining the average power at the frequency point, the downlink frequency point power calibration value for each frequency point can be determined according to the following formula:

[0109] Frequency point power calibration value = AVGpower - Pi.

[0110] In another possible implementation, when the absolute difference between the power of the frequency point in the downlink band and the average power of the frequency point is greater than or equal to the preset power deviation threshold, after determining the average power of the frequency point, the downlink frequency point power calibration value of each frequency point can be determined according to the following formula:

[0111] Frequency point power calibration value = preset calibration coefficient * (AVGpower - Pi), where the preset calibration coefficient is a value greater than 0 and less than 1.

[0112] The following uses an example to illustrate the method for determining the frequency point power calibration value described above.

[0113] In one example, record AVGpower - Pi as Ci, that is, Ci = AVGpower - Pi. The number of preset power deviation thresholds is 2, and the values of the preset power deviation thresholds are 3dB and 6dB. The frequency point power calibration value is recorded as Ci', and the preset calibration coefficients are recorded as A and B. Then, the downlink frequency point power calibration value of each frequency point can be determined according to the following formula:

[0114] When |Ci| < 3dB, the frequency point power calibration value Ci' = CidB;

[0115] When 3dB < |Ci| < 6dB, the frequency point power calibration value Ci' = A * CidB;

[0116] When |Ci| > 6dB, the frequency point power calibration value Ci' = B * CidB;

[0117] Among them, B < A < 1, and the sum of the frequency point power calibration values of each frequency point is 0, that is, the total power remains unchanged before and after calibration.

[0118] After determining the downlink frequency point power calibration value, according to the reciprocity of the uplink and downlink channels, the downlink frequency point power calibration value is determined as the corresponding uplink frequency point power calibration value.

[0119] Step S6: The terminal transmits an uplink signal on the uplink link corresponding to the power calibration reference signal based on the uplink frequency point power calibration value corresponding to the power calibration reference signal to calibrate the uplink frequency point power.

[0120] For example, referring to FIG13, which is a calibration timing diagram for uplink antenna switching according to an embodiment of the present disclosure, after the terminal receives the power calibration reference signal 1 and performs calibration based on the uplink frequency power calibration value 1 determined based on the power calibration reference signal 1, if the terminal changes the transmit antenna of the uplink signal, the previously received power calibration reference signal 1 is no longer applicable to the new uplink. At this time, the terminal can discard the previously determined uplink frequency power calibration value 1 and wait to receive the power calibration reference signal 2 corresponding to the new uplink. Then, it determines the uplink frequency power calibration value 2 based on the power calibration reference signal 2 and uses the uplink frequency power calibration value 1 to send the uplink signal. In this way, the consistency between the uplink frequency power calibration value and the uplink can be ensured.

[0121] Thirdly, referring to FIG14, a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure is shown, which includes: at least one processor 1401, at least one memory 1402, and one or more I / O interfaces 1403. The one or more I / O interfaces 1403 are connected between the processor 1401 and the memory 1402. The memory 1402 stores one or more computer programs, which are executed by at least one processor 1401 to enable the at least one processor 1401 to implement the first aspect and any possible embodiments thereof, or to implement the second aspect and any possible embodiments thereof.

[0122] Among them, the processor is a device with data processing capabilities, including but not limited to the central processing unit (CPU); the memory is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read-write interface) is connected between the processor and the memory, enabling information exchange between the memory and the processor, including but not limited to the data bus (Bus).

[0123] Fourthly, embodiments of this disclosure provide a computer-readable medium having a computer program stored thereon, which, when executed by a processor, implements the first aspect and any possible embodiments thereof, or implements the second aspect and any possible embodiments thereof.

[0124] Fifthly, embodiments of this disclosure provide a computer program product, which includes a computer program that, when executed by a processor, implements the first aspect and any possible embodiments thereof, or implements the second aspect and any possible embodiments thereof.

[0125] Those skilled in the art will understand that all or some of the steps, systems, and devices disclosed above, as functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0126] In hardware implementations, the division between functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be executed by several physical components working together.

[0127] Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit (CPU), digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technique for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH) or other disk storage; read-only optical disc (CD-ROM), digital versatile disc (DVD) or other optical disc storage; magnetic cartridges, magnetic tapes, disk storage or other magnetic storage; and any other media that can be used to store desired information and can be accessed by a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0128] This disclosure has disclosed exemplary embodiments, and although specific terminology has been used, it is for general illustrative purposes only and should not be construed as limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this disclosure as set forth by the appended claims.

Claims

1. A power calibration method, comprising: The terminal receives at least one set of power calibration reference signals from the base station, and each set of power calibration reference signals corresponds to an uplink; The terminal determines the downlink frequency power calibration value corresponding to each set of power calibration reference signals by measuring each set of power calibration reference signals, and determines the uplink frequency power calibration value corresponding to each set of power calibration reference signals based on the downlink frequency power calibration value corresponding to each set of power calibration reference signals; the terminal transmits an uplink signal on the uplink link corresponding to each set of power calibration reference signals based on the uplink frequency power calibration value corresponding to each set of power calibration reference signals to calibrate the uplink frequency power.

2. The method according to claim 1, wherein, The step of determining the downlink frequency power calibration value corresponding to each group of power calibration reference signals includes: determining the power of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals; determining the average power of the frequency points based on the power of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals; determining the frequency power calibration value of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals based on the power of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals and the average power of the frequency points; and determining the frequency power calibration value of each frequency point in the downlink frequency band as the downlink frequency power calibration value corresponding to each group of power calibration reference signals.

3. The method according to claim 2, wherein, The step of determining the frequency point power calibration value of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals based on the power of each frequency point in the downlink frequency band occupied by each group of power calibration reference signals and the average power of the frequency points includes: when the absolute difference between the power of the frequency point in the downlink frequency band and the average power of the frequency points is less than a preset power deviation threshold, determining the frequency point power calibration value of the frequency point in the downlink frequency band occupied by each group of power calibration reference signals based on the power of the frequency point in the downlink frequency band occupied by each group of power calibration reference signals and the average power of the frequency points; or, when the absolute difference between the power of the frequency point in the downlink frequency band and the average power of the frequency points is greater than or equal to the preset power deviation threshold, determining the frequency point power calibration value of the frequency point in the downlink frequency band occupied by each group of power calibration reference signals based on the power of the frequency point in the downlink frequency band occupied by each group of power calibration reference signals, the average power of the frequency points, and at least one preset calibration coefficient, wherein each preset calibration coefficient is a value greater than 0 and less than 1.

4. The method according to claim 1, wherein, Each set of power calibration reference signals is uniformly distributed in the frequency domain within the frequency band of its corresponding link.

5. The method according to claim 1, wherein, The link configuration parameters used to transmit the power calibration reference signal are the same as those used to transmit the uplink signal, and the link configuration parameters include at least one of the beamforming parameters of the link-associated beam and the antenna configuration parameters of the link-associated antenna.

6. A power calibration method, comprising: The base station sends at least one set of power calibration reference signals to the terminal, and each set of power calibration reference signals corresponds to an uplink of the terminal. The base station receives uplink signals transmitted by the terminal on the uplink corresponding to each set of power calibration reference signals. The uplink signals are transmitted based on the uplink frequency power calibration values ​​corresponding to each set of power calibration reference signals. The uplink frequency power calibration values ​​are determined according to the downlink frequency power calibration values ​​corresponding to each set of power calibration reference signals. The downlink frequency power calibration values ​​are determined according to each set of power calibration reference signals.

7. The method according to claim 6, wherein, The base station sends at least one set of power calibration reference signals to the terminal, including: the base station sends the at least one set of power calibration reference signals to the terminal through at least one port, each port corresponds to one uplink, each port is used to send one set of power calibration reference signals, and when the number of power calibration reference signals is multiple sets, any two sets of power calibration reference signals occupy different time and frequency resources.

8. The method according to claim 6, wherein, Before the base station sends at least one set of power calibration reference signals to the terminal, the method further includes: when the base station determines that the proportion of target data packets in the data packets received from the terminal through the uplink within a first preset time period is greater than a first preset ratio, and determines that the proportion of the in-band flatness evaluation value of the uplink signal transmitted by the terminal through the uplink within a second preset time period that is greater than a preset flatness evaluation threshold is greater than a second preset ratio, generating a calibration trigger instruction, and triggering the sending of the power calibration reference signals to the terminal based on the calibration trigger instruction; wherein the number of resource blocks occupied by the target data packets is greater than the preset number of resource blocks.

9. The method according to claim 8, wherein, The in-band flatness assessment value includes the maximum power deviation of the uplink signal at each of the multiple frequency points it occupies, or the standard deviation of the power of the uplink signal at all the multiple frequency points it occupies, wherein the power deviation at each frequency point is determined based on the power at each frequency point and the average power at all frequency points.

10. The method according to claim 8, wherein, After the power calibration reference signal is sent to the terminal based on the calibration trigger instruction, the method further includes: generating an exit calibration instruction when the base station determines that at least one of the following conditions 1 and 2 is met, the exit calibration instruction being used to indicate disabling or discarding the uplink frequency power calibration value; the base station sending the exit calibration instruction to the terminal so that the terminal disables or discards the uplink frequency power calibration value based on the exit calibration instruction; wherein, condition 1: the proportion of target data packets in data packets received within a preset time is less than or equal to a preset ratio; condition 2: the in-band flatness evaluation value of the uplink signal transmitted through the uplink is less than or equal to a preset flatness evaluation threshold.

11. The method according to any one of claims 1 to 10, wherein, The sum of the downlink frequency power calibration values ​​corresponding to each group of power calibration reference signals is 0, and the sum of the uplink frequency power calibration values ​​corresponding to each group of power calibration reference signals is 0.

12. An electronic device comprising a memory and a processor; the memory storing a computer program executable by the processor, wherein the computer program, when executed by the processor, implements the method of any one of claims 1 to 11.

13. A computer program product comprising a computer program that, when executed by a processor, implements the method of any one of claims 1 to 11.

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