A method and system for calibrating radio frequency parameters of a 5G NR mobile terminal

Abstract

This application discloses a method for calibrating radio frequency (RF) parameters of a 5G NR mobile terminal. All single-carrier frequency bands are divided into three categories: reference frequency band, fully reused frequency band, and partially reused frequency band, and are respectively processed in full calibration mode, data reuse mode, and incremental calibration mode. For single frequency bands of in-band carrier aggregation, combinations of multiple frequency bands of inter-band carrier aggregation, and combinations of multiple frequency bands of E-UTRA-NR dual connectivity, the three modes are applied respectively. This application shortens the overall RF parameter calibration time of the 5G NR mobile terminal, reduces the volume and storage space occupied by the overall calibration data, and shortens the query time for finding the RF parameters that need compensation in the overall calibration data.

Description

Technical Field

[0001] This application relates to a method for calibrating and optimizing radio frequency parameters of a mobile terminal. Background Technology

[0002] In the manufacturing process of mobile phones and other wireless communication devices (hereinafter referred to as mobile terminals), radio frequency (RF) calibration is a core process used to ensure the performance consistency of mobile terminals. RF calibration plays an important role in compensating for the following three key variables: (1) Manufacturing tolerance compensation, eliminating ±5% process deviations in semiconductor components. (2) Environmental adaptability calibration, covering parameter drift compensation within the operating temperature range of -40℃ to 85℃. (3) Lifecycle management, offsetting the average annual performance degradation of RF components by 2%. To eliminate these effects, each mobile terminal needs to undergo RF calibration before leaving the factory to measure and calculate error data of various RF parameters and store them in storage media such as NVM (non-volatile memory). During normal use of the mobile terminal, the CPU reads the calibration data in the NVM and uses a certain algorithm to compensate for the RF parameters that need compensation.

[0003] The existing method for calibrating the radio frequency parameters of mobile terminals is to calibrate each mobile terminal individually, with the calibration items mainly targeting core radio frequency parameters, including AFC (Automatic Frequency Control), AGC (Automatic Gain Control), and APC (Automatic Power Control).

[0004] With the arrival of the 5G NR (New Radio) era, mobile terminals are adding support for 5G frequency bands on top of existing frequency bands. In addition, there are 5G CA (Carrier Aggregation) combinations and EN-DC (E-UTRA-NR Dual Connectivity) combinations. E-UTRA stands for Evolved UMTS Terrestrial Radio Access or Evolved Universal Terrestrial Radio Access, typically referring to LTE mobile communication technology. UMTS stands for Universal Mobile Telecommunications System. This presents the following challenges for the radio frequency calibration of mobile terminals. Firstly, there is the pressure of spectrum expansion, with the number of Sub-6GHz bands surging to 56, a 240% increase compared to LTE bands. Secondly, there is the complexity of combinations, with CA combinations adding 32 new scenarios and EN-DC combinations adding 57 new scenarios. If existing RF parameter calibration methods are used, the calibration time for a single mobile terminal will increase exponentially, as will the amount of calibration data and the required NVM storage space. This will significantly increase the mass production time and manufacturing cost of mobile terminals. Furthermore, the time required to query the required RF parameters in real-time from the increased calibration data will also increase accordingly. Summary of the Invention

[0005] The technical problem to be solved by this application is: how to reduce the radio frequency calibration time of mobile terminals and reduce the amount of calibration data, thereby reducing the NVM storage space required for calibration data and reducing the query time in calibration data.

[0006] To address the aforementioned technical problems, this application proposes a radio frequency parameter calibration method for a 5G NR mobile terminal, comprising the following steps: Step S1: Set unique frequency band indices for all frequency bands and frequency band combinations supported by the 5G NR mobile terminal. Step S2: Divide all single-carrier frequency bands into three categories: reference frequency band, fully reused frequency band, and partially reused frequency band. If two single-carrier frequency bands meet a first condition, one of the frequency bands is designated as the anchor frequency band, and the other as the fully reused frequency band; the first condition refers to: the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combination in the transmit link of the two frequency bands is the same, the low-noise amplifier and filter combination in the receive link of the two frequency bands is the same, and the topology of the radio frequency switch matrix of the two frequency bands is consistent. If two single-carrier frequency bands meet the second condition, one of the frequency bands is called the anchor band, and the other is called the partially reused band. The second condition refers to: the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combination in the transmit link of the two frequency bands is the same, and the low-noise amplifier and filter combination in the receive link of the two frequency bands is the same, but the topology of the RF switch matrix of the two frequency bands is different. All single-carrier frequency bands, except for fully reused and partially reused frequency bands, are reference frequency bands. Step S3: Perform a complete calibration process once for each reference frequency band to obtain the calibration data for each reference frequency band, and save the frequency band index and calibration data for each reference frequency band; this is the complete calibration mode. Step S4: Do not perform calibration operations for each fully reused frequency band, only save the frequency band index of each fully reused frequency band and the frequency band index of the corresponding anchor band, thereby reusing the calibration data of the corresponding anchor band; this is the data reuse mode. For each incremental power point resulting from the different topology of the RF switch matrix between each partially reused frequency band and its corresponding anchor frequency band, a single-point calibration process is performed to obtain one or more single-point calibration data. The frequency band index of each partially reused frequency band, the frequency band index of the corresponding anchor frequency band, and the single-point calibration data of all incremental power points are saved, thereby reusing the calibration data of the corresponding anchor frequency band; this is the incremental calibration mode. Step S5: For each intra-band carrier aggregation, it is determined whether the first condition or the second condition is met between a single frequency band and a single carrier frequency band. It is also determined whether the first condition or the second condition is met between each frequency band and a single carrier frequency band in the combination of multiple frequency bands in each inter-band carrier aggregation. If the first condition is met, the data reuse mode is used; if the second condition is met, the incremental calibration mode is used; otherwise, the full calibration mode is used. Step S6: For each frequency band and a single carrier frequency band in the combination of multiple frequency bands in E-UTRA-NR dual connectivity, it is determined whether the first condition or the second condition is met. If the first condition is met, the data reuse mode is used; if the second condition is met, the incremental calibration mode is used; otherwise, the full calibration mode is used.Steps S5 and S6 may be performed either first or simultaneously.

[0007] Furthermore, in step S1, all frequency bands and frequency band combinations supported by the 5G NR mobile terminal include: single-carrier frequency bands, single frequency bands of in-band carrier aggregation, and combinations of multiple frequency bands of inter-band carrier aggregation and E-UTRA-NR dual connectivity.

[0008] Furthermore, in step S1, if the frequency ranges of two frequency bands are completely or partially the same, different frequency band indices should be set respectively; if the frequency ranges of two frequency band combinations are completely or partially the same, different frequency band indices should also be set respectively.

[0009] Furthermore, in step S2, when determining the anchor frequency band, the total number of anchor frequency bands should be minimized.

[0010] Furthermore, in step S2, the reference frequency band completely includes all anchor frequency bands.

[0011] Furthermore, during or after the execution of steps S4, S5, and S6, step S7 is also included: establishing a reusable frequency band relationship matrix, wherein the reusability relationship between each frequency band and frequency band combination supported by the 5G NR mobile terminal and a single carrier frequency band is recorded.

[0012] Furthermore, in step S7, the recorded content includes: the reuse relationship between single-carrier frequency bands, the reuse relationship between a single frequency band in in-band carrier aggregation and a single-carrier frequency band, the reuse relationship between a combination of multiple frequency bands in inter-band carrier aggregation and a single-carrier frequency band, and the reuse relationship between a combination of multiple frequency bands in E-UTRA-NR dual connectivity and a single-carrier frequency band.

[0013] This application also proposes a radio frequency parameter calibration system for a 5G NR mobile terminal, including a frequency band index setting unit, a single-carrier frequency band classification unit, a reference frequency band calibration unit, a single-carrier frequency band multiplexing unit, a carrier aggregation frequency band and frequency band combination processing unit, and a dual-connectivity frequency band combination processing unit. The frequency band index setting unit is used to set unique frequency band indices for all frequency bands and frequency band combinations supported by the 5G NR mobile terminal. The single-carrier frequency band classification unit is used to divide all single-carrier frequency bands into three categories: fully reused frequency bands, partially reused frequency bands, and reference frequency bands. When two single-carrier frequency bands meet the first condition, one of the frequency bands is called the anchor frequency band, and the other is called the fully reused frequency band. The first condition refers to: the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combination in the transmission link of the two frequency bands is the same, the low noise amplifier and filter combination in the receiving link of the two frequency bands is the same, and the topology of the RF switch matrix of the two frequency bands is consistent. When two single-carrier frequency bands meet the second condition, one of the frequency bands is called the anchor frequency band, and the other is called the partially reused frequency band. The second condition refers to: the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combination in the transmission link of the two frequency bands is the same, and the low noise amplifier and filter combination in the receiving link of the two frequency bands is the same, but the topology of the RF switch matrix of the two frequency bands is different. Among all single-carrier frequency bands, all frequency bands except for fully reused frequency bands and partially reused frequency bands are reference frequency bands. The reference frequency band calibration unit performs a complete calibration process for each reference frequency band, obtaining calibration data for each reference frequency band. The band index and calibration data for each reference frequency band are stored in the NVM; this is the complete calibration mode. The single-carrier band multiplexing unit does not perform calibration operations on each fully multiplexed frequency band, but only stores the band index of each fully multiplexed frequency band and the band index of the corresponding anchor band; this is the data multiplexing mode. The single-carrier band multiplexing unit also performs a single-point calibration process for each incremental power point caused by the different topologies of the RF switch matrix between each partially multiplexed frequency band and the corresponding anchor band, obtaining one or more single-point calibration data. It stores the band index of each partially multiplexed frequency band, the band index of the corresponding anchor band, and the single-point calibration data for all incremental power points; this is the incremental calibration mode. The carrier aggregation frequency band and frequency band combination processing unit is used to determine whether the first condition or the second condition is met between a single frequency band and a single carrier frequency band in each intra-band carrier aggregation, and is also used to determine whether the first condition or the second condition is met between each frequency band and a single carrier frequency band in the combination of multiple frequency bands in inter-band carrier aggregation; if the first condition is met, the data multiplexing mode is adopted; if the second condition is met, the incremental calibration mode is adopted; otherwise, the full calibration mode is adopted.The dual-connection frequency band combination processing unit is used to determine whether each frequency band in the combination of multiple frequency bands of E-UTRA-NR dual connection meets the first condition or the second condition with the single carrier frequency band; if the first condition is met, the data multiplexing mode is adopted; if the second condition is met, the incremental calibration mode is adopted; otherwise, the full calibration mode is adopted.

[0014] The technical advantages achieved by this application are: shortening the overall radio frequency parameter calibration time for 5G NR mobile terminals, reducing the volume and storage space occupied by the overall calibration data, and avoiding the time and data storage costs caused by repeated calibration of the same or similar radio frequency paths. This application optimizes storage resources while ensuring calibration accuracy. This application also shortens the query time for finding the radio frequency parameters that need compensation in the overall calibration data. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the radio frequency parameter calibration method for the 5G NR mobile terminal proposed in this application.

[0016] Figure 2 This is a schematic diagram of the structure of the RF parameter calibration system for the 5G NR mobile terminal proposed in this application.

[0017] The following are the labels in the attached diagram: 1. Frequency band index setting unit; 2. Single carrier frequency band classification unit; 3. Reference frequency band calibration unit; 4. Single carrier frequency band multiplexing unit; 5. Carrier aggregation frequency band and frequency band combination processing unit; 6. Dual connection frequency band combination processing unit. Detailed Implementation

[0018] Research on the 3GPP Release 15 to 3GPP Release 17 standards shows that there is frequency overlap between the 4G LTE band and the 5G NR band in the Sub-6GHz band—that is, FR1 (frequency range 1) of 5G NR.

[0019] Table 1 shows examples of frequency bands that completely overlap with NR and LTE bands and their corresponding frequency ranges.

[0020] n1 Band 1 1920-1980 2110-2170 n3 Band 3 1710-1785 1805-1880 n5 Band 5 824-849 869-894 n8 Band 8 880-915 925-960 n28 Band 28 703-748 758-803

[0021] Table 1

[0022] Table 2 shows examples of partially overlapping frequency bands and corresponding frequency ranges in the NR and LTE bands.

[0023]

[0024]

[0025] Table 2

[0026] For NR and LTE frequency bands that completely or partially overlap, the uplink and downlink RF path architectures are likely to be the same. For example, if the uplink and downlink RF paths of the NRn1 and LTE Band1 frequency bands are completely identical, then only one frequency band needs to be calibrated, and the calibration results of the former can be completely reused for the other frequency band.

[0027] Please see Figure 1 The radio frequency parameter calibration method for 5G NR mobile terminals proposed in this application includes the following steps.

[0028] Step S1: Set unique, non-repeating frequency band indices for all frequency bands and frequency band combinations supported by the 5G NR mobile terminal. All frequency bands and frequency band combinations supported by the 5G NR mobile terminal are divided into the following seven parts: (1) each LTE single-carrier frequency band; (2) each NR single-carrier frequency band; (3) each single LTE frequency band of each LTE intra-band carrier aggregation (CA); (4) each single NR frequency band of each NR intra-band carrier aggregation; (5) each combination of multiple LTE frequency bands of each LTE inter-band carrier aggregation; (6) each combination of multiple NR frequency bands of each NR inter-band carrier aggregation; (7) each combination of one or more LTE frequency bands and one or more NR frequency bands of each E-UTRA-NR dual connectivity (EN-DC). Among them, (1) and (2) belong to single-carrier frequency bands, (3) and (4) belong to single frequency bands of intra-band carrier aggregation, and (5), (6) and (7) belong to combinations of multiple frequency bands of inter-band carrier aggregation and E-UTRA-NR dual connectivity. If two frequency bands have completely or partially the same frequency range—for example, if an LTE single-carrier frequency band and an NR single-carrier frequency band have completely or partially the same frequency range—different frequency band indices must be set for each. Similarly, if two frequency band combinations have completely or partially the same frequency range, different frequency band indices must also be set for each.

[0029] Step S2: Divide all LTE single-carrier frequency bands and NR single-carrier frequency bands supported by the 5G NR mobile terminal into three categories: reference frequency band, fully reused frequency band, and partially reused frequency band.

[0030] If a 5G NR mobile terminal supports a certain LTE single-carrier frequency band and a certain NR single-carrier frequency band that meet the first condition, then one of the frequency bands is called the anchor band, and the other frequency band is called the fully reused band. The first condition refers to: the frequency range overlap of the two frequency bands is ≥90%, the power amplifier and filter combination in the transmit link of the two frequency bands is the same, the low noise amplifier and filter combination in the receive link of the two frequency bands is the same, and the topology of the RF switch matrix of the two frequency bands is consistent.

[0031] If a 5G NR mobile terminal supports a certain LTE single-carrier frequency band and a certain NR single-carrier frequency band that meet the second condition, then one of the frequency bands is called the anchor band, and the other is called the partially reused band. The second condition refers to: the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combinations in the transmit links of the two frequency bands are the same, and the low-noise amplifier and filter combinations in the receive links of the two frequency bands are the same, but the topology of the RF switch matrix of the two frequency bands is different.

[0032] In this context, the RF switch matrix is ​​a device that enables RF signals to be routed via selectable paths. When determining the anchor frequency bands in both of the above scenarios, the total number of anchor frequency bands should be minimized.

[0033] Of all the LTE single-carrier frequency bands and NR single-carrier frequency bands supported by 5G NR mobile terminals, all frequency bands other than fully reused and partially reused frequency bands are referred to as reference frequency bands. Reference frequency bands completely encompass all anchor frequency bands.

[0034] Step S3: Perform a full calibration procedure once for each reference frequency band to obtain calibration data for each reference frequency band. Store the band index and calibration data for each reference frequency band in the NVM. This is called Full Cal.

[0035] Step S4: For each fully reused frequency band, no calibration operation is performed. The anchor frequency band corresponding to each fully reused frequency band is found. In the NVM, only the band index of each fully reused frequency band and the band index of the corresponding anchor frequency band are stored, thereby reusing the calibration data of the corresponding anchor frequency band. This is called No Cal. Since the calibration data of the anchor frequency band corresponding to each fully reused frequency band is not repeatedly saved, the storage space required for calibration data is reduced.

[0036] For each partially reused frequency band, the corresponding anchor frequency band is identified. For each incremental power point resulting from the different topology of the RF switch matrix between the partially reused frequency band and its corresponding anchor frequency band, a single-point calibration process is performed to obtain one or more single-point calibration data points. The frequency band index of each partially reused frequency band, the frequency band index of the corresponding anchor frequency band, and the single-point calibration data for all incremental power points are stored in the NVM, thus reusing the calibration data of the corresponding anchor frequency band. This is called Delta Cal. Because the calibration data for the anchor frequency band corresponding to each partially reused frequency band is not repeatedly saved, the storage space required for calibration data is reduced.

[0037] Step S5: For each LTE frequency band supported by the 5G NR mobile terminal for each LTE in-band carrier aggregation, and for each LTE single-carrier frequency band supported by the 5G NR mobile terminal, determine whether the first condition or the second condition is met. If the first condition is met, process in data multiplexing mode. If the second condition is met, process in incremental calibration mode. If neither the first nor the second condition is met, process in full calibration mode.

[0038] For each NR frequency band supported by the 5G NR mobile terminal for each NR in-band carrier aggregation, and for each NR single carrier frequency band supported by the 5G NR mobile terminal, determine whether the first condition or the second condition is met. If the first condition is met, data multiplexing mode is used for processing. If the second condition is met, incremental calibration mode is used for processing. If neither the first nor the second condition is met, full calibration mode is used for processing.

[0039] For each LTE frequency band in the combination of multiple LTE frequency bands supported by each LTE inter-band carrier aggregation supported by the 5G NR mobile terminal, and for each LTE single-carrier frequency band supported by the 5G NR mobile terminal, it is determined whether a first condition or a second condition is met. If the first condition is met, data multiplexing mode is used for processing. If the second condition is met, incremental calibration mode is used for processing. If neither the first nor the second condition is met, full calibration mode is used for processing.

[0040] For each NR frequency band in the combination of multiple NR frequency bands supported by each NR inter-band carrier aggregation supported by the 5G NR mobile terminal, and for each NR single carrier frequency band supported by the 5G NR mobile terminal, it is determined whether a first condition or a second condition is met. If the first condition is met, data multiplexing mode is used for processing. If the second condition is met, incremental calibration mode is used for processing. If neither the first nor the second condition is met, full calibration mode is used for processing.

[0041] In real-world scenarios, the frequency bands of intra-band carrier aggregation and single-carrier frequency bands are more likely to meet the first or second condition. The primary carrier frequency bands of inter-band carrier aggregation and single-carrier frequency bands are more likely to meet the first or second condition. However, the secondary carrier frequency bands of inter-band carrier aggregation and single-carrier frequency bands are less likely to meet the first or second condition.

[0042] Step S6: The frequency band combination of E-UTRA-NR dual connectivity supported by the 5G NR mobile terminal can be regarded as a combination of one or more LTE frequency bands and one or more NR frequency bands.

[0043] For each LTE frequency band in the LTE and NR frequency band combination, and for each LTE single-carrier frequency band supported by the 5G NR mobile terminal, determine whether the first condition or the second condition is met. If the first condition is met, data multiplexing mode is used for processing. If the second condition is met, incremental calibration mode is used for processing. If neither the first nor the second condition is met, full calibration mode is used for processing.

[0044] For each NR band in the LTE and NR band combination, and for each NR single-carrier band supported by the 5G NR mobile terminal, determine whether the first condition or the second condition is met. If the first condition is met, process in data multiplexing mode. If the second condition is met, process in incremental calibration mode. If neither the first nor the second condition is met, process in full calibration mode.

[0045] In real-world scenarios, the likelihood of satisfying either the first or second condition between the frequency bands of E-UTRA-NR dual connectivity and single-carrier frequency bands is relatively small.

[0046] There is no strict order requirement between steps S5 and S6; they can be performed either before or simultaneously.

[0047] Optionally, the method may further include step S7 during or after the execution of steps S4, S5, and S6: establishing a reusable frequency band relationship matrix, wherein the reusability relationship between each frequency band and frequency band combination supported by the 5G NR mobile terminal and a single carrier frequency band is recorded. If no reusability relationship exists, it is not recorded. The contents of this operation record include: (1) the reuse relationship between each fully reused frequency band and the reference frequency band; (2) the reuse relationship between each partially reused frequency band and the reference frequency band; (3) the reuse relationship between a single LTE frequency band and a single LTE carrier frequency band in LTE intra-band carrier aggregation; (4) the reuse relationship between a single NR frequency band and a single NR carrier frequency band in NR intra-band carrier aggregation; (5) the reuse relationship between a combination of multiple LTE frequency bands in LTE inter-band carrier aggregation and a single LTE carrier frequency band; (6) the reuse relationship between a combination of multiple NR frequency bands in NR inter-band carrier aggregation and a single NR carrier frequency band; (7) the reuse relationship between a combination of LTE and NR frequency bands in E-UTRA-NR dual connectivity and a single LTE carrier frequency band; and (8) the reuse relationship between a combination of LTE and NR frequency bands in E-UTRA-NR dual connectivity and a single NR carrier frequency band. Among them, (1) and (2) belong to the reuse relationship between single carrier frequency bands, (3) and (4) belong to the reuse relationship between a single frequency band and a single carrier frequency band in intra-band carrier aggregation, (5) and (6) belong to the reuse relationship between a combination of multiple frequency bands in inter-band carrier aggregation and a single carrier frequency band, and (7) and (8) belong to the reuse relationship between a combination of multiple frequency bands in E-UTRA-NR dual connectivity and a single carrier frequency band.

[0048] The following example, a specific RF parameter calibration project for a 5G NR mobile terminal, illustrates the differences between existing technologies and this application. Table 3 lists the number of frequency bands supported by the 5G NR mobile terminal in this calibration project.

[0049] LTE single carrier 14 0 LTE carrier aggregation 27 27 NR single carrier 12 0 NR carrier aggregation 17 17 E-UTRA-NR Dual Connectivity 11 11 total 81 55

[0050] Table 3

[0051] If the existing RF parameter calibration method is used, a full calibration mode needs to be used for all 136 frequency bands, and the calibration data for all 136 frequency bands needs to be saved in NVM.

[0052] If the RF parameter calibration method of this application is adopted, it is assumed that this application only has a full calibration mode and a data multiplexing mode, and no incremental calibration mode. All incremental calibration modes are converted to full calibration mode. This extreme scenario actually degrades the performance of this application, but it is more convenient for calculation. This application only needs to use the full calibration mode for 47 key frequency bands and the data multiplexing mode for 89 derived frequency bands. The number of frequency bands using the full calibration mode in this application is reduced from 136 to 47, a reduction of 65%. Assuming that the calibration data volume for each frequency band using the full calibration mode is 1KB, the storage space occupied by all calibration data in this application is reduced from 136KB to 47KB, saving 89KB of storage space. This application improves the retrieval speed for finding the RF parameters that need compensation in all calibration data by 2.9 times and reduces the query time by 72%.

[0053] Please see Figure 2 The RF parameter calibration system for the 5G NR mobile terminal proposed in this application includes a frequency band index setting unit 1, a single carrier frequency band classification unit 2, a reference frequency band calibration unit 3, a single carrier frequency band multiplexing unit 4, a carrier aggregation frequency band and frequency band combination processing unit 5, and a dual-connectivity frequency band combination processing unit 6. Figure 2 The system shown corresponds to Figure 1 The method shown.

[0054] The frequency band index setting unit 1 is used to set unique and non-repeating frequency band indices for all frequency bands and frequency band combinations supported by the 5G NR mobile terminal.

[0055] The single-carrier frequency band classification unit 2 is used to classify all LTE single-carrier frequency bands and NR single-carrier frequency bands supported by the 5G NR mobile terminal into three categories: fully reused frequency bands, partially reused frequency bands, and reference frequency bands. When a certain LTE single-carrier frequency band and a certain NR single-carrier frequency band supported by the 5G NR mobile terminal meet the first condition, one of the frequency bands is called the anchor frequency band, and the other frequency band is called the fully reused frequency band. The first condition refers to: the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combination in the transmit link of the two frequency bands is the same, and the low noise amplifier and filter combination in the receive link of the two frequency bands is the same, and the topology of the RF switch matrix of the two frequency bands is consistent. When a certain LTE single-carrier frequency band and a certain NR single-carrier frequency band supported by the 5G NR mobile terminal meet the second condition, one of the frequency bands is called the anchor frequency band, and the other frequency band is called the partially reused frequency band. The second condition refers to the following: the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combinations in the transmit links of the two frequency bands are the same, as are the low-noise amplifier and filter combinations in the receive links of the two frequency bands, but the topology of the RF switch matrix of the two frequency bands differs. Among all LTE single-carrier frequency bands and NR single-carrier frequency bands supported by 5G NR mobile terminals, all frequency bands except for fully reused and partially reused frequency bands are referred to as reference frequency bands.

[0056] The reference frequency band calibration unit 3 is used to perform a complete calibration process for each reference frequency band, obtain calibration data for each reference frequency band, and store the frequency band index and calibration data of each reference frequency band in the NVM. This is the complete calibration mode.

[0057] The single-carrier frequency band multiplexing unit 4 is used to multiplex the calibration data of the corresponding anchor frequency band for each fully multiplexed frequency band. In the NVM, only the frequency band index of each fully multiplexed frequency band and the frequency band index of the corresponding anchor frequency band are stored. This is the data multiplexing mode. The single-carrier frequency band multiplexing unit 4 is also used to multiplex the calibration data of the corresponding anchor frequency band for each partially multiplexed frequency band. Furthermore, it performs a single-point calibration process for each incremental power point caused by the different topology of the RF switch matrix between each partially multiplexed frequency band and its corresponding anchor frequency band, obtaining one or more single-point calibration data. In the NVM, the frequency band index of each partially multiplexed frequency band, the frequency band index of the corresponding anchor frequency band, and the single-point calibration data for all incremental power points are stored. This is the incremental calibration mode.

[0058] The carrier aggregation frequency band and frequency band combination processing unit 5 is used to determine whether a first condition or a second condition is met for each LTE intra-band carrier aggregation frequency band supported by the 5G NR mobile terminal and each LTE single-carrier frequency band supported by the 5G NR mobile terminal; and to determine whether a first condition or a second condition is met for each NR intra-band carrier aggregation frequency band supported by the 5G NR mobile terminal and each NR single-carrier frequency band supported by the 5G NR mobile terminal; and to determine whether a first condition or a second condition is met for each LTE frequency band in the LTE frequency band combination and each LTE single-carrier frequency band supported by the 5G NR mobile terminal; and to determine whether a first condition or a second condition is met for each NR frequency band in the NR frequency band combination and each NR single-carrier frequency band supported by the 5G NR mobile terminal. If the first condition is met, data multiplexing mode is used for processing. If the second condition is met, incremental calibration mode is used for processing. If neither the first nor the second condition is met, full calibration mode is used for processing.

[0059] The dual-connectivity frequency band combination processing unit 6 is used to determine whether a first condition or a second condition is met for each LTE frequency band in the frequency band combination of E-UTRA-NR dual connectivity supported by the 5G NR mobile terminal and each LTE single-carrier frequency band supported by the 5G NR mobile terminal; and to determine whether a first condition or a second condition is met for each NR frequency band in the frequency band combination of E-UTRA-NR dual connectivity supported by the 5G NR mobile terminal and each NR single-carrier frequency band supported by the 5G NR mobile terminal. If the first condition is met, data multiplexing mode is used for processing. If the second condition is met, incremental calibration mode is used for processing. If neither the first nor the second condition is met, full calibration mode is used for processing.

[0060] The frequency bands and combinations supported by 5G NR mobile terminals can be broadly divided into three parts: the first part is single-carrier frequency bands, the second part is a single frequency band of in-band carrier aggregation, and the third part is a combination of multiple frequency bands of inter-band carrier aggregation and E-UTRA-NR dual connectivity. For the first part, this application categorizes all single-carrier frequency bands into three types: performing full calibration mode only on the reference frequency band and saving all calibration data; not performing calibration on fully reused frequency bands and only saving the corresponding reference frequency band's frequency band index; and performing single-point calibration only on partially reused frequency bands and only saving the corresponding reference frequency band's frequency band index and single-point calibration data. For the second part, this application compares a single frequency band of in-band carrier aggregation with all single-carrier frequency bands, and adopts a data reuse mode or incremental calibration mode when either the first or second condition is met. For the second part, this application compares each frequency band in the frequency band combination with all single-carrier frequency bands, and adopts a data reuse mode or incremental calibration mode when either the first or second condition is met. Obviously, this application reduces the radio frequency calibration time of 5G NR mobile terminals, reduces the overall calibration data volume, and reduces the storage space required for the overall calibration data in the data reuse mode or incremental calibration mode. This also reduces the query time for finding the radio frequency parameters that need to be compensated in the overall calibration data and improves query efficiency.

[0061] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for calibrating radio frequency parameters of a 5G NR mobile terminal, characterized in that, Includes the following steps: Step S1: Set unique frequency band indices for all frequency bands and frequency band combinations supported by the 5G NR mobile terminal; Step S2: Divide all single-carrier frequency bands into three categories: reference frequency band, fully reused frequency band, and partially reused frequency band; If two single-carrier frequency bands meet the first condition, one of the frequency bands is called the anchor band and the other is called the fully reused band. The first condition means that the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combination in the transmit link of the two frequency bands is the same, the low noise amplifier and filter combination in the receive link of the two frequency bands is the same, and the topology of the RF switch matrix of the two frequency bands is consistent. If two single-carrier frequency bands meet the second condition, one of the frequency bands is called the anchor band and the other is called the partially reused band. The second condition means that the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combination in the transmission link of the two frequency bands is the same, and the low noise amplifier and filter combination in the reception link of the two frequency bands is the same, but the topology of the radio frequency switch matrix of the two frequency bands is different. In all single-carrier frequency bands, all bands except for fully reused bands and partially reused bands are reference bands; Step S3: Perform a complete calibration process once for each reference frequency band to obtain the calibration data for each reference frequency band, and save the frequency band index and calibration data for each reference frequency band; this is the complete calibration mode. Step S4: Do not perform calibration operation for each fully reused frequency band, but only save the frequency band index of each fully reused frequency band and the frequency band index of the corresponding anchor frequency band, thereby reusing the calibration data of the corresponding anchor frequency band; this is the data reuse mode. For each incremental power point resulting from the different topology of the RF switch matrix between each partially reused frequency band and the corresponding anchor frequency band, a single-point calibration process is performed to obtain one or more single-point calibration data. The frequency band index of each partially reused frequency band, the frequency band index of the corresponding anchor frequency band, and the single-point calibration data of all incremental power points are saved, thereby reusing the calibration data of the corresponding anchor frequency band; this is the incremental calibration mode. Step S5: For each intra-band carrier aggregation, determine whether the first condition or the second condition is met between a single frequency band and a single carrier frequency band; also, for each combination of multiple frequency bands in each inter-band carrier aggregation, determine whether the first condition or the second condition is met between each frequency band and a single carrier frequency band; if the first condition is met, adopt the data multiplexing mode; if the second condition is met, adopt the incremental calibration mode; otherwise, adopt the full calibration mode. Step S6: For each frequency band in the combination of multiple frequency bands in E-UTRA-NR dual connectivity, determine whether the first condition or the second condition is met with the single carrier frequency band; if the first condition is met, adopt the data multiplexing mode; if the second condition is met, adopt the incremental calibration mode; otherwise, adopt the full calibration mode. Steps S5 and S6 may be performed either first or simultaneously.

2. The radio frequency parameter calibration method for a 5G NR mobile terminal according to claim 1, characterized in that, In step S1, all frequency bands and frequency band combinations supported by the 5G NR mobile terminal include: single-carrier frequency bands, single frequency bands of in-band carrier aggregation, and combinations of multiple frequency bands of inter-band carrier aggregation and E-UTRA-NR dual connectivity.

3. The radio frequency parameter calibration method for a 5G NR mobile terminal according to claim 2, characterized in that, In step S1, if two frequency bands have completely or partially the same frequency range, different frequency band indices should be set respectively; if two frequency band combinations have completely or partially the same frequency range, different frequency band indices should also be set respectively.

4. The radio frequency parameter calibration method for a 5G NR mobile terminal according to claim 1, characterized in that, In step S2, when determining the anchor frequency band, the total number of anchor frequency bands should be minimized.

5. The radio frequency parameter calibration method for a 5G NR mobile terminal according to claim 1, characterized in that, In step S2, the reference frequency band completely includes all the anchor frequency bands.

6. The radio frequency parameter calibration method for a 5G NR mobile terminal according to claim 1, characterized in that, During or after the execution of steps S4, S5, and S6, step S7 is also included: establishing a reusable frequency band relationship matrix, which records the reusability relationship between each frequency band and frequency band combination supported by the 5G NR mobile terminal and a single carrier frequency band.

7. The radio frequency parameter calibration method for a 5G NR mobile terminal according to claim 6, characterized in that, In step S7, the recorded content includes: the reuse relationship between single-carrier frequency bands, the reuse relationship between a single frequency band in intra-band carrier aggregation and a single-carrier frequency band, the reuse relationship between a combination of multiple frequency bands in inter-band carrier aggregation and a single-carrier frequency band, and the reuse relationship between a combination of multiple frequency bands in E-UTRA-NR dual connectivity and a single-carrier frequency band.

8. A radio frequency parameter calibration system for a 5G NR mobile terminal, characterized in that, It includes a frequency band index setting unit, a single carrier frequency band classification unit, a reference frequency band calibration unit, a single carrier frequency band multiplexing unit, a carrier aggregation frequency band and frequency band combination processing unit, and a dual-connection frequency band combination processing unit; The frequency band index setting unit is used to set unique frequency band indices for all frequency bands and frequency band combinations supported by the 5G NR mobile terminal; The single-carrier frequency band classification unit is used to divide all single-carrier frequency bands into three categories: fully reused frequency bands, partially reused frequency bands, and reference frequency bands. When two single-carrier frequency bands meet a first condition, one of the frequency bands is called an anchor frequency band, and the other is called a fully reused frequency band. The first condition refers to: the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combination in the transmission link of the two frequency bands is the same, the low noise amplifier and filter combination in the receiving link of the two frequency bands is the same, and the topology of the RF switch matrix of the two frequency bands is consistent. When two single-carrier frequency bands meet a second condition, one of the frequency bands is called an anchor frequency band, and the other is called a partially reused frequency band. The second condition refers to: the frequency range overlap of the two frequency bands is ≥90%, and the power amplifier and filter combination in the transmission link of the two frequency bands is the same, and the low noise amplifier and filter combination in the receiving link of the two frequency bands is the same, but the topology of the RF switch matrix of the two frequency bands is different. Among all single-carrier frequency bands, all frequency bands except for fully reused frequency bands and partially reused frequency bands are reference frequency bands. The reference frequency band calibration unit is used to perform a complete calibration process for each reference frequency band to obtain calibration data for each reference frequency band, and save the frequency band index and calibration data of each reference frequency band in NVM; this is the complete calibration mode. The single-carrier band multiplexing unit is used to perform no calibration operation on each fully multiplexed band, but only saves the band index of each fully multiplexed band and the band index of the corresponding anchor band; this is the data multiplexing mode. The single-carrier band multiplexing unit is also used to perform a single-point calibration process on each incremental power point caused by the different topology of the RF switch matrix between each partially multiplexed band and the corresponding anchor band, to obtain one or more single-point calibration data; and saves the band index of each partially multiplexed band, the band index of the corresponding anchor band, and the single-point calibration data of all incremental power points; this is the incremental calibration mode. The carrier aggregation frequency band and frequency band combination processing unit is used to determine whether the first condition or the second condition is met between a single frequency band and a single carrier frequency band in each intra-band carrier aggregation, and is also used to determine whether the first condition or the second condition is met between each frequency band and a single carrier frequency band in the combination of multiple frequency bands in inter-band carrier aggregation; if the first condition is met, the data multiplexing mode is adopted; if the second condition is met, the incremental calibration mode is adopted; otherwise, the full calibration mode is adopted. The dual-connection frequency band combination processing unit is used to determine whether each frequency band in the combination of multiple frequency bands of E-UTRA-NR dual connection meets the first condition or the second condition with the single carrier frequency band; if the first condition is met, the data multiplexing mode is adopted; if the second condition is met, the incremental calibration mode is adopted; otherwise, the full calibration mode is adopted.

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