Adaptive spectrum truncation configuration method and system based on speed and frequency point sensing, transmitting device and medium

Abstract

The application relates to the technical field of wireless communication, and discloses a speed and frequency point sensing-based adaptive spectrum truncation configuration method, a system, a transmitting device and a medium. The method comprises the following steps: determining a speed level in which a transmitting device currently locates according to a moving speed, determining a target mapping table according to a current working frequency point, and determining a target truncation factor according to a current modulation format; if the speed level changes, triggering truncation factor adaptive switching based on a hysteresis mechanism to update the target truncation factor in a gradual manner; if the current working frequency point or the current modulation format changes, immediately triggering the re-determination and switching of the truncation factor; synchronizing the updated target truncation factor to a receiving device, using the updated target truncation factor to perform spectrum truncation processing on modulation symbols to generate a waveform, and sending the waveform to the receiving device. The application can realize adaptive configuration of the truncation factor without increasing complex signaling interaction and machine learning training.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a method, system, transmitting device and medium for adaptive spectrum truncation configuration based on speed and frequency awareness. Background Technology

[0002] In 5G and its evolved communication systems, the uplink employs Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveforms to reduce the peak-to-average power ratio (PAPR), thereby improving power amplifier efficiency and coverage. To further reduce PAPR, Spectrum Truncation (FDSS-ST) technology has been proposed, which involves truncating subcarriers of DFT-s-OFDM symbols in the frequency domain. Existing technologies propose a method for adaptively selecting the truncation factor based on context information. The core mechanism of this method is to dynamically determine the truncation factor based on information such as channel state information, MCS level, number of resource blocks or bandwidth, and power margin report.

[0003] However, existing adaptive truncation schemes have the following problems: First, they lack a speed-aware mechanism: they do not utilize the key context information of the UE's real-time movement speed to optimize the spectrum truncation configuration. Second, they lack a frequency-aware mechanism: since the Doppler frequency shift fd = v·fc·cosθ / c is proportional to the carrier frequency fc, at the same movement speed, the Doppler frequency shift difference between different operating frequencies is significant (e.g., the difference between 2GHz and 4GHz frequencies is double), and the optimal truncation factor also changes accordingly. Existing schemes do not consider the impact of frequency differences on the optimal truncation factor. Third, performance deteriorates in high-speed scenarios, and the optimal truncation ratio strongly depends on the UE's movement speed; existing schemes do not consider the impact of speed changes on truncation performance. Fourth, fixed or coarse-grained configurations cannot adapt to dynamic speeds and variable frequencies: in existing schemes, the truncation factor is a fixed preset value or only statically mapped based on the device type, which cannot respond to dynamic changes in UE speed and frequency switching. Therefore, existing technologies cannot match the optimal cutoff factor under different speed levels and frequency conditions, which can easily lead to a decrease in transmission reliability in high-speed or high-frequency scenarios and a loss of spectral efficiency in low-speed or low-frequency scenarios.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] The main purpose of this application is to provide an adaptive spectrum truncation configuration method, system, transmitting equipment, and medium based on speed and frequency awareness. This aims to solve the problem that the lack of joint awareness of the moving speed and operating frequency of the transmitting equipment in the prior art makes it impossible to match the optimal truncation factor under different speed levels and frequency conditions, which in turn causes a decrease in transmission reliability in high-speed or high-frequency scenarios and a loss of spectrum efficiency in low-speed or low-frequency scenarios.

[0006] The first aspect of this application provides a speed and frequency-aware adaptive spectrum truncation configuration method, which includes the following steps: Obtain the transmitting equipment's moving speed, current operating frequency, and current modulation format; The speed level of the transmitting device is determined based on the moving speed, the corresponding target mapping table is determined from multiple pre-configured mapping tables based on the current operating frequency, and the target cutoff factor is determined from the target mapping table based on the current modulation format. The system detects whether the speed level, the current operating frequency, or the current modulation format has changed. If the speed level changes, it triggers an adaptive switching of the truncation factor based on a hysteresis mechanism. After filtering by the hysteresis mechanism, the target truncation factor is updated in a gradual manner. If the current operating frequency or the current modulation format changes, it immediately triggers the redetering and switching of the truncation factor to directly update the target truncation factor. The updated target truncation factor is synchronized to the receiving device, and the updated target truncation factor is used to perform spectrum truncation processing on the modulation symbols to generate a waveform, which is then sent to the receiving device. The receiving device is configured in conjunction with the non-transparent frequency domain spectrum shaping (FDSS) mode to receive and process the waveform.

[0007] Optionally, in one embodiment of this application, obtaining the moving speed, current operating frequency, and current modulation format of the transmitting device specifically includes: The moving speed of the transmitting device is obtained by estimation through Doppler frequency shift, and / or by calculation based on position and time information obtained through GNSS or cellular network positioning, and / or by base station assisted measurement and notification by downlink control information (DCI) or media access control layer control unit (MAC CE), and / or by estimation through cell handover frequency or beam switching frequency, and / or by acquisition through built-in motion sensors, and / or by estimation through uplink timing advance rate of change; The current operating frequency of the transmitting device is obtained. For the autonomous decision-making mode of the transmitting device, the current operating frequency is read from the local radio frequency configuration. For the control mode of the receiving device, the current operating frequency is obtained from the Radio Resource Control (RRC) or DCI sent by the receiving device. Alternatively, the current operating frequency is implicitly determined through the binding relationship between the frequency band indication and the pre-configured frequency point-mapping table. The current modulation format of the transmitting device is obtained. For the autonomous decision-making mode of the transmitting device, the current modulation format is read from the local modulation and coding scheme (MCS) configuration. For the control mode of the receiving device, the current modulation format is obtained from the DCI transmitted by the receiving device.

[0008] Optionally, in one embodiment of this application, the step of determining the current speed level of the transmitting device based on the moving speed, determining the corresponding target mapping table from multiple pre-configured mapping tables based on the current operating frequency, and determining the target cutoff factor from the target mapping table based on the current modulation format specifically includes: The current speed level of the transmitting device is determined by comparing the moving speed with multiple preset speed thresholds. The speed levels include low speed, medium speed, high speed and ultra-high speed. Low speed is when the moving speed is less than a first speed threshold. Medium speed is when the moving speed is greater than or equal to the first speed threshold and less than a second speed threshold. High speed is when the moving speed is greater than or equal to the second speed threshold and less than a third speed threshold. Ultra-high speed is when the moving speed is greater than or equal to the third speed threshold. Based on the current operating frequency, a target mapping table corresponding to the current operating frequency is selected from multiple pre-configured mapping tables. Each mapping table corresponds to a different operating frequency or frequency band, and each mapping table contains the cutoff factor range corresponding to each speed level and each modulation format. The target mapping table is searched for a cutoff factor range that matches the speed level and the current modulation format, and a value within the cutoff factor range is selected as the target cutoff factor.

[0009] Optionally, in one embodiment of this application, the step of detecting whether the speed level, the current operating frequency, or the current modulation format has changed, and if the speed level has changed, triggering an adaptive switching of the truncation factor based on a hysteresis mechanism, and updating the target truncation factor in a gradual manner after hysteresis filtering; if the current operating frequency or the current modulation format has changed, immediately triggering the redetering and switching of the truncation factor to directly update the target truncation factor, specifically includes: Obtain the current speed level, current operating frequency, and current modulation format, and compare them with the speed level, operating frequency, and modulation format corresponding to the last time the target truncation factor was determined, to determine whether there have been any changes. If the speed level changes, an adaptive switching of the cutoff factor based on a hysteresis mechanism is initiated. The switching condition is determined according to a preset hysteresis threshold. When the switching condition is met, the target cutoff factor is updated to the cutoff factor corresponding to the current speed level in a stepwise adjustment manner. If the current operating frequency changes, the target mapping table is reselected based on the changed current operating frequency, and the target cutoff factor is re-determined from the reselected target mapping table based on the current speed level and the current modulation format, so as to directly update the target cutoff factor. If the current modulation format changes, the target cutoff factor corresponding to the changed modulation format is re-determined from the current target mapping table based on the current speed level and the current operating frequency, so as to directly update the target cutoff factor.

[0010] Optionally, in one embodiment of this application, the step of synchronizing the updated target truncation factor to the receiving device, performing spectral truncation processing on the modulation symbols using the updated target truncation factor to generate a waveform, and sending the waveform to the receiving device specifically includes: The updated target truncation factor is synchronized to the receiving device via signaling, wherein the signaling is one or more of uplink control information, downlink control information, or radio resource control signaling; Using the updated target truncation factor, a discrete Fourier transform is performed on the modulation symbols to obtain a frequency domain sequence. The actual number of subcarriers mapped is calculated based on the target truncation factor. A corresponding number of samples are selected from the frequency domain sequence and mapped onto the subcarriers. After frequency domain spectrum shaping, FDSS filtering, and inverse fast Fourier transform, a time domain waveform is generated. The time-domain waveform is sent to the receiving device.

[0011] Optionally, in one embodiment of this application, synchronizing the updated target truncation factor to the receiving device via signaling specifically includes: When the target cutoff factor is determined autonomously by the transmitting device, the target cutoff factor is indicated to the receiving device through uplink control information (UCI); When the target truncation factor is assisted or determined by the receiving device, a configuration instruction for the target truncation factor is received from the receiving device via downlink control information (DCI).

[0012] Optionally, in one embodiment of this application, the process of obtaining the moving speed, current operating frequency, and current modulation format of the transmitting device further includes: Report the capability information of the transmitting equipment to the network side; Receive confirmation information returned by the network side, wherein the confirmation information is used to indicate the activation of speed and frequency-aware adaptive spectrum truncation configuration.

[0013] A second aspect of this application also provides a speed and frequency-aware adaptive spectrum truncation configuration system, wherein the speed and frequency-aware adaptive spectrum truncation configuration system is used to implement the speed and frequency-aware adaptive spectrum truncation configuration method described in any of the above solutions; the speed and frequency-aware adaptive spectrum truncation configuration system includes: The information sensing and acquisition module is used to acquire the moving speed, current operating frequency, and current modulation format of the transmitting equipment; The truncation factor decision module is used to determine the current speed level of the transmitting device based on the moving speed, determine the corresponding target mapping table from multiple pre-configured mapping tables based on the current operating frequency, and determine the target truncation factor from the target mapping table based on the current modulation format. An adaptive update module is used to detect whether the speed level, the current operating frequency, or the current modulation format has changed. If the speed level changes, an adaptive switching of the truncation factor based on a hysteresis mechanism is triggered, and the target truncation factor is updated gradually after filtering by the hysteresis mechanism. If the current operating frequency or the current modulation format changes, the redetering and switching of the truncation factor is immediately triggered to directly update the target truncation factor. The transmit / receive linkage execution module is used to synchronize the updated target truncation factor to the receiving device, use the updated target truncation factor to perform spectrum truncation processing on the modulation symbols to generate a waveform, and send the waveform to the receiving device; wherein, the receiving device adopts a non-transparent frequency domain spectrum shaping (FDSS) mode in conjunction with the spectrum truncation to receive and process the waveform.

[0014] A third aspect of this application also provides a transmitting device, wherein the transmitting device includes: a memory, a processor, and a speed and frequency-aware adaptive spectrum truncation configuration program stored in the memory and executable on the processor, wherein when the speed and frequency-aware adaptive spectrum truncation configuration program is executed by the processor, it implements the steps of the speed and frequency-aware adaptive spectrum truncation configuration method as described above.

[0015] A fourth aspect of this application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a speed and frequency-aware adaptive spectrum truncation configuration program, which, when executed by a processor, implements the steps of the speed and frequency-aware adaptive spectrum truncation configuration method as described above.

[0016] Beneficial Effects: This application provides an adaptive spectrum truncation configuration method, system, transmitting device, and medium based on speed and frequency awareness. By acquiring the transmitting device's moving speed, current operating frequency, and current modulation format, this application establishes a three-dimensional joint sensing and decision-making mechanism for speed level, frequency mapping table, and modulation format. The truncation factor is dynamically bound to real-time moving speed, operating frequency, and modulation format, achieving accurate matching of the truncation factor under different speed levels and frequency conditions. Simultaneously, by continuously detecting changes in speed level, operating frequency, and modulation format, and updating speed level changes gradually after hysteresis filtering, and updating changes in operating frequency or modulation format immediately, frequent switching near the speed threshold is avoided, while ensuring immediate response during frequency switching or modulation format changes, thus improving system stability and adaptability. Furthermore, by synchronizing the updated target truncation factor to the receiving device and enabling the receiving device to use a non-transparent FDSS mode for joint configuration with the transmitting end's spectrum truncation, matching the transmitting and receiving parameters is ensured, resulting in positive gain for spectrum truncation and further improving the overall system performance. This application achieves intelligent adaptive configuration of the truncation factor without adding complex signaling interaction and machine learning training. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of a preferred embodiment of the adaptive spectrum truncation configuration method based on speed and frequency awareness of this application; Figure 2 This is a flowchart illustrating the specific implementation steps of the entire execution process in the speed and frequency-aware adaptive spectrum truncation configuration method of this application. Figure 3 This is a schematic diagram of the signaling interaction process of the adaptive spectrum truncation configuration method based on speed and frequency point awareness in this application. Figure 4 This is a structural diagram of a preferred embodiment of the adaptive spectrum truncation configuration system based on speed and frequency awareness of this application. Figure 5 This is a block diagram of the adaptive spectrum truncation configuration system based on speed and frequency point awareness in this application. Figure 6 This is a structural diagram of a preferred embodiment of the launching device of this application.

[0019] Explanation of reference numerals in the attached figures: 100. Information perception and acquisition module; 200. Truncated factor decision module; 300. Adaptive update module; 400. Send and receive linkage execution module. Detailed Implementation

[0020] To make the objectives, technical solutions, and effects of this application clearer and more explicit, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of this application and not all possible implementations. Based on the embodiments in this application, those skilled in the art can obtain other embodiments without creative effort, and these embodiments are also within the protection scope of this application.

[0021] First, let's introduce the terms used in the embodiments of this application: DFT-s-OFDM, Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing; PAPR, Peak-to-Average Power Ratio; UE, User Equipment; aNB, AI NodeB 6G base station; CQI, Channel Quality Indicator; MCS, Modulation and Coding Scheme; RB, Resource Block; PHR, Power Headroom Report; SNR, Signal-to-Noise Ratio; BLER, Block Error Rate; SE stands for Spectral Efficiency. UCI, Uplink Control Information; DCI, Downlink Control Information; SRS, Sounding Reference Signal; GNSS, Global Navigation Satellite System; RRC, Radio Resource Control; MAC CE, Medium Access Control Element; FDSS, Frequency Domain Spectrum Shaping.

[0022] In related technologies, neither the real-time moving speed of the transmitting equipment is used as the core dimension for truncation factor decision-making, nor is the current operating frequency used as the basis for mapping table selection. Furthermore, no differentiated adaptive switching mechanism is established for different triggering conditions such as speed changes, frequency switching, and modulation format changes. Speed, as a continuously changing physical quantity, is prone to frequent jitter near the speed threshold. Without hysteresis handling, this leads to frequent truncation factor switching, affecting system stability. Frequency switching and modulation format changes, on the other hand, are deterministic events requiring immediate response to ensure transmission performance. These deficiencies result in an overly optimistic truncation factor in high-speed scenarios, leading to link synchronization loss; an inability to effectively combat Doppler fading in high-frequency scenarios; and an overly conservative approach in low-speed or low-frequency scenarios, resulting in wasted spectrum resources and hindering system performance.

[0023] This application overcomes the performance degradation of existing fixed spectrum truncation strategies in high-speed scenarios, maximizing system throughput or energy efficiency under different mobility scenarios and frequency bands. By introducing a dual mechanism of speed and frequency awareness, this application incorporates the UE's real-time speed and current operating frequency into the truncation factor decision, and comprehensively considers the modulation scheme and receiver FDSS configuration to achieve adaptive optimization under different mobility scenarios and frequency bands.

[0024] Unlike existing static schemes, the core of this application lies in introducing an adaptive decision-making mechanism based on speed awareness and frequency awareness, as a further deepening and supplement to the applicant's existing general adaptive truncation method (based on contextual information such as channel state, MCS, RB, and PHR). Specifically: First, the real-time moving speed information of the UE is acquired through various methods (Doppler frequency shift estimation, GNSS positioning, base station-assisted measurement, motion sensors, etc.), along with the current operating frequency information. Then, based on the speed information, the current speed level (low / medium / high / ultra-high speed) of the UE is determined. Based on the operating frequency, the corresponding target mapping table is selected from multiple candidate mapping tables (the higher the frequency, the lower the truncation factor at the same speed level), and the currently used modulation format information is also acquired. Next, based on the frequency, speed level, and modulation method, the target truncation factor is dynamically determined from multiple predefined candidate truncation factors—a high truncation ratio is selected for low-speed scenarios to obtain higher spectral efficiency, while a low truncation ratio is selected for high-speed scenarios to ensure link reliability. The receiver uses a non-transparent FDSS mode in conjunction with the transmitter's spectrum truncation configuration to ensure effective truncation gain. Finally, the truncation factor is synchronized between the transceiver devices via UCI or DCI signaling, and spectrum truncation processing is performed. When the UE's speed crosses a speed level threshold or frequency point, an adaptive switching of the truncation factor is triggered (including a hysteresis mechanism to prevent the ping-pong effect).

[0025] In this way, under the FDSS-ST combined framework, this application takes speed and frequency as the core dimensions for truncation factor decision-making, realizes dynamic binding of truncation factor with UE moving speed and operating frequency, and fundamentally solves the problem of performance degradation of fixed truncation under different moving speeds and multi-frequency band scenarios.

[0026] The technical solutions of this application will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0027] It should be noted that in a communication system, the signal transmitting end is collectively referred to as the transmitting device, and the signal receiving end is collectively referred to as the receiving device. The method in this application uses the transmitting device as the main execution entity and the receiving device as a cooperating execution end. In uplink transmission scenarios, the transmitting device is a user equipment (UE, such as a mobile phone, vehicle terminal, IoT device, etc.), and the receiving device is a network-side device (such as a base station); in downlink transmission scenarios, the transmitting device is a network-side device (such as a base station), and the receiving device is a user equipment; in sidelink transmission scenarios, both the transmitting device and the receiving device are user equipment. The receiving device mentioned in each step of this application refers to the peer device communicating with the transmitting device, and the network side refers to infrastructure such as base stations and core networks in the communication system.

[0028] In the application scenario of this application, taking the uplink of a sixth-generation mobile communication system as an example, the transmitting device is a user equipment, the receiving device is a base station, and uplink transmission is performed using a DFT-s-OFDM (Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing) waveform. This waveform is widely used due to its low peak-to-average power ratio (PAPR). This application optimizes transmission performance under different mobile speeds and multi-band scenarios by performing frequency-domain adaptive spectral truncation of the DFT-s-OFDM waveform on the transmitting device side and jointly configuring it using a non-transparent FDSS (Frequency Domain Spectrum Shaping) mode on the receiving device side.

[0029] For ease of description, the term "transmitting device" is used as the general term in the following specific embodiments. In specific instances, it may be specified as a user equipment (UE) or a base station as needed, but the scope of protection of this application is not limited to this.

[0030] The preferred embodiment of this application describes an adaptive spectrum truncation configuration method based on speed and frequency awareness, such as... Figure 1 As shown, the adaptive spectrum truncation configuration method based on speed and frequency awareness includes the following steps: In step S10, the moving speed of the transmitting device, the current operating frequency, and the current modulation format are obtained.

[0031] In one possible implementation, step S10 specifically includes: acquiring the moving speed of the transmitting device, which is obtained by Doppler frequency shift estimation, and / or by obtaining position and time information through Global Navigation Satellite System (GNSS) or cellular network positioning, and / or by base station-assisted measurement and controlled by downlink control information (DCI) or media access control layer (MAC) control unit. The following methods are employed: obtaining CE notification, and / or estimating via cell handover frequency or beam switching frequency, and / or acquiring via built-in motion sensors, and / or estimating via uplink timing advance rate of change; obtaining the current operating frequency of the transmitting device; for the transmitting device's autonomous decision-making mode, reading the current operating frequency from the local radio frequency configuration; for the receiving device's control mode, obtaining the current operating frequency from the Radio Resource Control (RRC) or DCI sent by the receiving device; or implicitly determining the current operating frequency through the binding relationship between frequency band indication and pre-configured frequency point-mapping table; obtaining the current modulation format of the transmitting device; for the transmitting device's autonomous decision-making mode, reading the current modulation format from the local modulation and coding scheme (MCS) configuration; for the receiving device's control mode, obtaining the current modulation format from the DCI sent by the receiving device.

[0032] Specifically, the UE's moving speed information is obtained. Moving speed can be obtained through any combination of one or more of the following methods: Method A (based on Doppler frequency shift estimation): The UE or base station estimates the Doppler frequency shift based on the received signal (such as SRS, DMRS, CSI-RS), and then calculates the UE's moving speed. The relationship between the Doppler frequency shift fd and the UE's speed v is: fd = v·fc·cosθ / c, where fc is the carrier frequency, c is the speed of light, and θ is the angle between the direction of movement and the direction of arrival. v can be calculated by estimating fd.

[0033] Method B (based on location information): This method uses GNSS or cellular network positioning technology to obtain the UE's location and time information, and calculates the movement speed by dividing the change in location by the time interval. The UE can obtain its own location and speed information through its built-in GNSS receiver.

[0034] Method C (Base Station Assisted): The base station estimates the UE speed by measuring the frequency offset or Doppler shift of the uplink SRS signal and notifies the UE via downlink signaling (DCI or MAC CE).

[0035] Method D (based on historical handover frequency): The UE estimates its mobility level based on the cell handover frequency or beam handover frequency. For example, a UE moving at high speed will experience more frequent cell handovers.

[0036] Method E (based on motion sensors): The UE obtains speed information through built-in motion sensors such as accelerometers and gyroscopes.

[0037] Method F (based on the rate of change of uplink timing advance): The base station estimates the UE's moving speed by detecting the rate of change of the UE's uplink timing advance (TA).

[0038] In practical applications, various fusion estimation methods can be used to improve the accuracy of velocity information. For example, the UE can combine GNSS positioning and motion sensor data for velocity estimation; the base station can combine Doppler frequency shift estimation and TA change rate for velocity estimation.

[0039] Specifically, the current operating frequency information is obtained. In determining the target cutoff factor, this application requires obtaining the current operating frequency information in addition to velocity information and modulation format. This frequency information can be obtained through the following methods: For UE autonomous decision-making mode, the UE reads the current operating frequency (such as 2GHz, 3.5GHz, 4GHz, 7GHz, 28GHz, etc.) from the local radio frequency configuration. In base station control mode, the base station obtains the current frequency information from the system configuration and notifies the UE via RRC or DCI; Frequency information can also be implicitly determined through the binding relationship between the band indicator and the pre-configured frequency point mapping table.

[0040] A key technical feature of this application is that different operating frequencies correspond to different cutoff factor mapping tables. Since the Doppler shift is proportional to the carrier frequency, at the same speed, higher frequencies correspond to larger Doppler shifts, and the channel changes faster over time, thus requiring a more conservative (lower) cutoff ratio. Conversely, lower frequencies can use a more aggressive (higher) cutoff ratio.

[0041] Specifically, modulation format information needs to be obtained. When determining the target cutoff factor, this application also needs to obtain the currently used modulation format (at least π / 2-BPSK and QPSK). Modulation format information can be obtained from the following sources: In UE autonomous decision-making mode, the UE reads the current modulation format from the local modulation and coding scheme (MCS) configuration; In base station control mode, the base station obtains the current scheduling modulation format from the scheduling decision and notifies the UE via DCI.

[0042] A key technical feature of this application is that, under the same speed level and frequency, the optimal cutoff factors of π / 2-BPSK and QPSK are significantly different. Therefore, it is necessary to jointly determine the target cutoff factor by considering the frequency, speed level and modulation format.

[0043] It is worth noting that this application provides multiple speed acquisition methods and various combination and fusion schemes, enabling the method to adapt to different terminal capabilities. High-end terminals can utilize GNSS and motion sensors to provide high-precision speed information, while low-end terminals can utilize base station assistance or frequency switching to simplify estimation. The fusion estimation of speed information further improves accuracy. By distinguishing between frequency point and modulation format acquisition methods in autonomous decision-making mode and network control mode, the method is compatible with both UE autonomous decision-making and base station-assisted decision-making architectures, improving the flexibility and scenario adaptability of the solution.

[0044] In one possible implementation, before step S10, the method further includes: reporting the capability information of the transmitting device to the network side; receiving confirmation information returned by the network side, wherein the confirmation information is used to indicate the activation of speed and frequency-aware adaptive spectrum truncation configuration.

[0045] Specifically, the capability information includes any one or more of the following: indication information on whether it supports adaptive spectrum truncation configuration based on speed and frequency awareness; supported speed level identification capabilities (such as the number and accuracy of speed levels that can be identified); supported speed information acquisition methods (such as GNSS, motion sensors, base station-based measurements, etc.); supported frequency awareness capabilities (such as a list of supported frequency bands / frequency points); supported one or more truncation factor candidate sets (to distinguish different modulation formats); and indication information on whether it supports joint configuration of non-transparent FDSS and spectrum truncation. In practical applications, the capability reporting occurs during the RRC establishment or reconfiguration process when the transmitting equipment initially accesses the network.

[0046] If the network side confirms the activation, the transmitting device performs adaptive spectrum truncation configuration according to the method; if the network side does not confirm the activation or does not return confirmation information, the transmitting device reverts to the traditional fixed truncation scheme or the existing adaptive truncation scheme to ensure backward compatibility.

[0047] It is worth noting that this application enables the network side to grasp the capabilities of the transmitting equipment through a pre-capability reporting and confirmation mechanism, and decide whether to enable this method, thus avoiding adverse effects on equipment that does not support the relevant capabilities. Through confirmation control on the network side, the smooth deployment and backward compatibility of the new scheme are achieved, that is, new equipment enables the enhanced scheme, and old equipment reverts to the traditional scheme, without affecting the normal operation of existing equipment. At the same time, it also conforms to the conventional process of communication system standardization, making the method of this invention easier to integrate into the existing standard system.

[0048] In step S20, the current speed level of the transmitting device is determined based on the moving speed, the corresponding target mapping table is determined from multiple pre-configured mapping tables based on the current operating frequency, and the target cutoff factor is determined from the target mapping table based on the current modulation format.

[0049] In one possible implementation, step S20 specifically includes: determining the current speed level of the transmitting device by comparing the moving speed with multiple preset speed thresholds, wherein the speed level includes low speed, medium speed, high speed, and ultra-high speed, where low speed is when the moving speed is less than a first speed threshold, medium speed is when the moving speed is greater than or equal to the first speed threshold and less than a second speed threshold, high speed is when the moving speed is greater than or equal to the second speed threshold and less than a third speed threshold, and ultra-high speed is when the moving speed is greater than or equal to the third speed threshold; selecting a target mapping table corresponding to the current operating frequency from multiple pre-configured mapping tables, wherein each mapping table corresponds to a different operating frequency or frequency band, and each mapping table contains a truncation factor range corresponding to each speed level and each modulation format; searching in the target mapping table for a truncation factor range that matches the speed level and the current modulation format, and selecting a value within the truncation factor range as the target truncation factor.

[0050] Specifically, this embodiment divides the UE speed into multiple speed levels, with each frequency point independently configured with a corresponding mapping table. Each mapping table, combined with the modulation scheme, corresponds to a different recommended range of truncation factors. Based on simulation data, taking the 3.5-4.0 GHz band (hereinafter referred to as the 4GHz frequency point) as an example, a specific mapping relationship table is given as a typical implementation of this application.

[0051] Table 1: (4GHz frequency) Mapping relationship between speed level and cutoff factor (non-transparent Rx FDSS)

[0052] It is understandable that Table 1 is based on simulation data from the 3.5-4.0 GHz band, the TDL-C 300ns channel model, and 16RB allocation. For other operating frequencies (such as 2.0 GHz, 6.0 GHz, millimeter wave bands, etc.), mapping tables should be determined separately based on the Doppler characteristics and channel model of that frequency. Generally, the higher the frequency, the greater the Doppler frequency shift at the same speed, and the recommended cutoff factor corresponding to each speed level should be adaptively reduced. Mapping tables for different frequencies can be pre-stored in the UE and the base station, or dynamically distributed by the base station through RRC / MAC CE.

[0053] The truncation factor is defined as the ratio of the number of frequency domain samples to be truncated to the number of original DFT points: α = (LK) / L, where L is the number of original DFT points and K is the number of subcarriers actually mapped.

[0054] The term "non-transparent FDSS" refers to the receiver configuring frequency domain filter coefficients specifically to compensate for truncation distortion when the truncation factor at the transmitter is known. In contrast, "transparent FDSS" refers to the receiver not performing specific compensation but only performing conventional frequency domain filtering.

[0055] The speed level thresholds (30 / 200 / 500 km / h) are determined based on simulation optimization results under the 3GPP TDL-C channel model. The specific values ​​can be adapted and adjusted according to the actual deployment scenario (such as carrier frequency and channel environment).

[0056] The basic principle of mapping relationships is as follows: In low-speed scenarios (v < 30 km / h): the channel changes slowly, the coherence time is long, and the channel estimation accuracy is high. A high cutoff ratio can be used to obtain higher spectral efficiency. Under π / 2-BPSK modulation, a cutoff ratio of 30%-40% can achieve significant positive gain (e.g., at 3 km / h, with 40% cutoff, the net gain under non-transparent FDSS is +2.10dB); under QPSK modulation, the cutoff ratio must be strictly controlled to not exceed 10%.

[0057] In medium-speed scenarios (30-200 km / h): the channel begins to exhibit time-selective fading, requiring a moderate reduction in the cutoff ratio to balance power gain and SNR loss. A 10% cutoff ratio in π / 2-BPSK modulation can achieve positive gain (e.g., at 120 km / h, with 10% cutoff, the net gain under non-transparent FDSS is +0.77 dB); in QPSK modulation, the cutoff ratio should be controlled below 5%.

[0058] In high-speed scenarios (200-500 km / h): significant Doppler shift leads to decreased channel estimation accuracy, necessitating further reduction in the truncation ratio to ensure link reliability. A 10% truncation ratio in π / 2-BPSK modulation yields a slight positive gain (e.g., at 300 km / h, with 10% truncation, the net gain under non-transparent FDSS is +0.35 dB); however, truncation results in a negative gain in QPSK modulation, and it is recommended to avoid truncation or maintain a truncation ratio below 5%.

[0059] In ultra-high speed scenarios (≥500 km / h): the Doppler effect is severe. It is recommended that π / 2-BPSK adopt a low cutoff ratio or even no cutoff, and QPSK should be completely uncut.

[0060] The influence of frequency on the mapping relationship is as follows: Table 2: Optimal cutoff ratios at different frequencies under 300 km / h and π / 2-BPSK modulation:

[0061] Therefore, this application supports independent configuration of truncation factor mapping tables for different frequency points. The mapping table for each frequency point can be determined in advance through simulation or actual measurement and stored in the local configuration of the UE and the base station, or issued by the base station through RRC signaling. The mapping table includes at least the following dimensions: frequency point / band, speed level, modulation format, and recommended truncation factor range.

[0062] There are four ways to determine the target cutoff factor: Method A (Rule-based decision based on speed level and modulation scheme): Select the corresponding mapping table based on the current operating frequency (if there is no dedicated mapping table for the current frequency, the mapping table of the nearest frequency can be used or calculated by interpolation). Then, determine the recommended range of the target cutoff factor by looking up the table according to the speed level and modulation scheme, and select a specific value within this range. The selection of the specific value can refer to the following principles: within the same recommended range, the better the channel quality (higher CQI), the higher the cutoff ratio should be selected; within the same recommended range, the higher the PHR (more sufficient power margin), the higher the cutoff ratio should be selected; within the same recommended range, the more RBs there are, the higher the cutoff ratio can be appropriately selected.

[0063] Method B (Optimal Implementation Based on Maximizing Equivalent Net Gain): When determining the target cutoff factor, the criterion of maximizing the equivalent net gain can be adopted. The equivalent net gain G_eff(α) is defined as: G_eff(α)=ΔP_Tx(α)-ΔSNR(α)+10·log 10 (SE(α) / SE(0)); Where: α is the truncation factor, 0≤α<0.5; ΔP_Tx(α) is the transmit power gain with truncation factor α compared to no truncation, in dB. This gain comes from the reduced PAPR, which allows the power amplifier to have a smaller back-off, thus transmitting at higher power; ΔSNR(α) is the signal-to-noise ratio loss with truncation factor α compared to no truncation, in dB. This loss comes from the energy loss caused by frequency domain sample truncation; SE(α) and SE(0) are the actual achievable spectral efficiencies with and without truncation factor α, respectively. SE(α) can be obtained through link-level simulation or system-level simulation (e.g., by dividing the throughput obtained through BLER simulation by the occupied bandwidth), or it can be obtained based on modulation and coding scheme (MCS) level mapping; 10·log 10 The term (SE(α) / SE(0)) reflects the relative change in spectral efficiency due to changes in modulation and coding schemes.

[0064] The system selects the α_i that maximizes G_eff(α_i) from the candidate truncation factor set {α_i} as the target truncation factor. The joint mapping table of speed level, working frequency point and modulation format of the present invention (as shown in Table 1) is an engineering simplified implementation obtained by optimizing G_eff(α) under different parameter combinations, and the recommended truncation factor range in each entry covers the neighborhood where G_eff(α) reaches the optimal value or is close to the optimal value.

[0065] In one implementation, the candidate truncation factor set is a discrete set, for example {0, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%}, the system traverses each candidate factor in the set to calculate G_eff(α), and selects the truncation factor corresponding to the maximum value.

[0066] In another implementation, to improve processing efficiency, the recommended range of the truncation factor can be directly determined by looking up the table based on the speed level, working frequency point and modulation format, and then combined with the real-time measured values of ΔP_Tx and ΔSNR, a linear search is performed within the recommended range to further finely adjust the truncation factor.

[0067] Mode C (fine mapping based on continuous speed values): Under the mapping table framework corresponding to the selected frequency point, finer mapping can be performed according to the continuous value of speed, and a linear or piecewise linear function is used to calculate the target truncation factor. For example, for the 4GHz frequency point and π / 2-BPSK modulation: when v≤30km / h, α_target=0.30+0.10×(v / 30), with a range of 30%-40%; when 30<v≤200km / h, α_target=0.30-0.20×(v-30) / 170, with a range decreasing from 30% to 10%; when 200<v≤500km / h, α_target=0.10-0.05×(v-200) / 300, with a range decreasing from 10% to 5%; when v>500km / h, α_target=0.05, that is 5%. For QPSK modulation, the upper limit of each speed level is strictly limited according to Table 1. For other frequency points, a similar piecewise linear mapping is adopted under the corresponding mapping table framework.

[0068] Mode D (joint decision of multi-context information): In addition to speed information, frequency point information and modulation format, context information such as channel quality, PHR, MCS, and the number of RBs can also be combined for joint decision-making to improve decision accuracy.

[0069] It is worth noting that this application makes the decision granularity of the truncation factor more refined by dividing the speed into four levels and corresponding to different speed thresholds, which can adapt to diverse scenarios from low-speed indoors to ultra-high-speed maglev; by configuring mapping tables independently for different frequency points, the truncation factor decision can reflect the physical law of Doppler frequency shift with carrier frequency, that is, the higher the frequency point, the more conservative the truncation, and the lower the frequency point, the more aggressive the truncation; by including both speed level and modulation format dimensions in the mapping table, the decision mechanism can distinguish the different requirements of π / 2-BPSK and QPSK for the optimal truncation factor, avoiding the performance loss caused by a one-size-fits-all approach.

[0070] In step S30, it is detected whether the speed level, the current operating frequency, or the current modulation format has changed. If the speed level changes, an adaptive switching of the truncation factor based on a hysteresis mechanism is triggered, and the target truncation factor is updated in a gradual manner after filtering by the hysteresis mechanism. If the current operating frequency or the current modulation format changes, the redetering and switching of the truncation factor is immediately triggered to directly update the target truncation factor.

[0071] In one possible implementation, step S30 specifically includes: acquiring the current speed level, the current operating frequency, and the current modulation format, and comparing them with the speed level, operating frequency, and modulation format corresponding to the last determination of the target truncation factor, respectively, to determine whether there has been a change; if the speed level has changed, then initiating an adaptive switching of the truncation factor based on a hysteresis mechanism, judging whether the switching conditions are met according to a preset hysteresis threshold, and when the switching conditions are met, updating the target truncation factor to the truncation factor corresponding to the current speed level in a stepwise adjustment manner; if the current operating frequency has changed, then reselecting the target mapping table according to the changed current operating frequency, and re-determining the target truncation factor from the reselected target mapping table according to the current speed level and the current modulation format, so as to directly update the target truncation factor; if the current modulation format has changed, then re-determining the target truncation factor corresponding to the changed modulation format from the current target mapping table according to the current speed level and the current operating frequency, so as to directly update the target truncation factor.

[0072] Specifically, when the UE speed crosses the speed level threshold, an adaptive handover of the truncation factor is triggered. The handover process includes: periodic or event-triggered speed estimation and level determination; speed level change detection; reselection of the target truncation factor (modulation format must also be considered); signaling synchronization of the truncation factor and subsequent transmission handover.

[0073] To prevent the ping-pong effect caused by frequent handovers near the speed threshold, this embodiment introduces a hysteresis mechanism: the handover threshold for increasing speed is higher than the handover threshold for decreasing speed. For example, when the speed increases from the low-speed range to the medium-speed range, the trigger threshold is 35 km / h (higher than the standard threshold of 30 km / h); when the speed decreases from the medium-speed range to the low-speed range, the trigger threshold is 25 km / h (lower than the standard threshold of 30 km / h). The hysteresis range is [25, 35] km / h, within which the UE maintains its current truncation factor unchanged.

[0074] In one implementation, the size of the hysteresis interval is configurable, and the hysteresis threshold can be configured independently for different speed levels.

[0075] In another implementation, speed level switching triggers a gradual (step-by-step) adjustment of the cutoff factor, rather than an abrupt change, to further smooth the switching process.

[0076] Specifically, when a UE undergoes frequency switching (e.g., switching from 4GHz to 6GHz, or from Sub-6G to millimeter-wave band), the frequency change needs to be detected and the corresponding truncation factor mapping table needs to be updated. The switching process includes: periodic or event-triggered frequency information acquisition; frequency change detection; loading the corresponding mapping table based on the new frequency; re-determining the target truncation factor based on the new mapping table combined with the current speed level and modulation format; signaling synchronization of the truncation factor and subsequent transmission switching. The truncation factor update triggered by frequency switching does not require a hysteresis mechanism and should take effect immediately, because frequency switching is usually accompanied by radio link reconfiguration, and there is no ping-pong effect problem.

[0077] In one implementation, frequency switching and mapping table switching can be completed synchronously via RRC reconfiguration signaling.

[0078] This application distinguishes between three triggering conditions (speed level change, operating frequency change, and modulation format change) and adopts different switching strategies for each, so that the switching mechanism can simultaneously take into account stability and timeliness. The speed change is gradually updated after hysteresis filtering, which effectively avoids the ping-pong effect caused by frequent switching near the speed threshold. The frequency change and modulation format change are updated immediately, ensuring that deterministic link reconfiguration events can obtain the appropriate truncation factor in time, and that transmission performance is not affected by unnecessary delays.

[0079] In step S40, the updated target truncation factor is synchronized to the receiving device, the updated target truncation factor is used to perform spectrum truncation processing on the modulation symbols to generate a waveform, and the waveform is sent to the receiving device; wherein, the receiving device adopts a non-transparent frequency domain spectrum shaping (FDSS) mode in conjunction with the spectrum truncation to receive and process the waveform.

[0080] In one possible implementation, step S40 specifically includes: synchronizing the updated target truncation factor to the receiving device via signaling, wherein the signaling is one or more of uplink control information, downlink control information, or radio resource control signaling; using the updated target truncation factor, performing a discrete Fourier transform on the modulation symbols to obtain a frequency domain sequence; calculating the actual number of mapped subcarriers based on the target truncation factor; selecting a corresponding number of samples from the frequency domain sequence and mapping them onto the subcarriers; generating a time domain waveform after frequency domain spectrum shaping (FDSS) filtering and inverse fast Fourier transform; and sending the time domain waveform to the receiving device.

[0081] In one possible implementation, the step of synchronizing the updated target truncation factor to the receiving device via signaling specifically includes: when the target truncation factor is determined autonomously by the transmitting device, instructing the receiving device to indicate the target truncation factor via uplink control information (UCI); when the target truncation factor is assisted or determined by the receiving device, receiving the configuration indication of the target truncation factor from the receiving device via downlink control information (DCI).

[0082] Specifically, depending on the system implementation and scheduling strategy, any of the following methods can be adopted: Method 1 (Terminal Instruction Network): When the transmitting device autonomously determines the target truncation factor (such as the UE autonomous decision in Method A), it indicates the factor to be used to the receiving device. This indication can be achieved through reserved bits in the uplink control information (UCI), for example, using 2-3 bits to indicate different truncation factor indices.

[0083] Method 2 (Network Configuration Terminal): When the target truncation factor is assisted or determined by the receiving device (such as base station control in Method A), the receiving device sends a configuration instruction to the transmitting device via downlink control information (DCI). This instruction can be implemented by reusing existing waveform indication fields or defining new fields.

[0084] Method 3 (Implicit Synchronization): A mapping rule between speed levels and truncation factors is pre-configured via higher-layer signaling (RRC), and both transceiver devices store this mapping rule. During communication, the transceiver devices independently determine the truncation factor based on their acquired speed and frequency information, without requiring real-time signaling interaction.

[0085] Another key technical feature of this application is that the synchronization information simultaneously includes the truncation factor, modulation format, and frequency point / mapping table index. The receiver configures the corresponding non-transparent FDSS parameters according to this information to achieve optimal matching between the transmitter's truncation and the receiver's FDSS.

[0086] In practical applications, when reporting capabilities, UEs can report their supported speed level identification capabilities, frequency point awareness capabilities, and truncation factor candidate sets.

[0087] This application provides three synchronization methods—UCI, DCI, and RRC—to enable the method to flexibly adapt to different architectures. UCI can be used for UE autonomous decision-making, DCI can be used for base station control, and RRC can achieve implicit synchronization without dynamic signaling. By clearly defining the complete processing link of spectrum truncation (DFT-truncation-FDSS-IFFT), those skilled in the art can directly implement it based on the description.

[0088] Specifically, the target truncation factor is used to perform DFT transformation and spectral truncation on the modulation symbol to be transmitted, generating and transmitting the final time-domain waveform signal. The receiving end uses a non-transparent FDSS mode to perform matched frequency-domain spectral shaping on the received signal.

[0089] See Figure 2 The frequency domain sequence S_k is obtained by performing an L-point DFT on the L modulation symbols; the number of subcarriers actually mapped is calculated as K = L × (1 - α) based on the target truncation factor α; K samples are selected from the sequence S_k (usually based on its inherent conjugate symmetry) and mapped onto K consecutive or specified subcarriers. FDSS filtering can be performed optionally, and then the time domain signal is generated through subsequent processing such as IFFT.

[0090] The receiving end processing flow includes: performing FFT transformation on the received signal to obtain the frequency domain signal; using non-transparent FDSS (i.e., receiving end frequency domain spectrum shaping) to process the frequency domain signal to match the spectrum truncation at the transmitting end; and performing subsequent demodulation, decoding, and other processing.

[0091] It is important to note that transmitter spectrum truncation and receiver non-transparent FDSS must be used in conjunction. If the receiver does not use FDSS (transparent mode), spectrum truncation will not provide positive gain. For example, at 4 GHz, 3 km / h, π / 2-BPSK, and 40% truncation, the net gain in transparent mode is -0.6 dB, while the net gain in non-transparent mode is +2.10 dB, a difference of 2.70 dB.

[0092] The gain from spectrum truncation is highly dependent on the receiver's FDSS mode. Taking 4GHz frequency, 3km / h π / 2-BPSK modulation, and 10RB occupied after truncation as an example: In non-transparent FDSS mode, the net gain from 40% truncation is 2.42dB, 30% is 2.92dB, 20% is 2.92dB, and 10% is 3.22dB, all of which are positive gains, with 10% truncation being the optimal ratio; however, if spectral efficiency improvement is also a priority, 40% is recommended. In transparent FDSS mode, the net gain from 40% truncation is 0.276dB, 30% is 0.786dB, 20% is 0.495dB, and 10% is 0.298dB, all of which are positive gains but significantly lower than in non-transparent mode.

[0093] For QPSK modulation, no positive gain is obtained at any cutoff ratio in transparent FDSS mode (no significant gain in either the 3km / h or 120km / h transparent modes), and positive gain can only be obtained in non-transparent FDSS mode. Therefore, this application explicitly requires a joint configuration of transmitter spectrum cutoff and receiver non-transparent FDSS.

[0094] Figure 3 The signaling interaction flowchart based on speed and frequency-aware adaptive truncation is shown below, and its signaling interaction process is briefly described as follows: To support the adaptive spectrum truncation method described in this application, the UE can optionally indicate its supported speed and frequency-aware adaptive truncation capabilities to the network through capability reporting information elements. The network confirms the RRC capability feedback to the UE. The UE first obtains its real-time moving speed through its built-in speed information acquisition module (such as Doppler frequency shift estimation, GNSS positioning, or motion sensors), reads the current operating frequency through radio frequency configuration, and reads the current modulation format from the local MCS configuration. Based on this, it determines the speed level, identifies the frequency, and initially selects the target truncation factor (selecting the corresponding mapping table based on the current frequency, and jointly looking up the table with the speed level and modulation format). At the same time, the UE sends a reference signal to the aNB through uplink SRS or DMRS for the base station to perform Doppler frequency shift measurement to cross-verify the UE speed. Subsequently, the aNB sends confirmation or configuration instructions for speed information, frequency information, and modulation format to the UE through downlink DCI or MAC CE, and the two parties complete the initial parameter synchronization.

[0095] During the truncation factor decision phase, the UE determines the target truncation factor α based on the joint mapping relationship between frequency point, speed level, and modulation format (i.e., a three-dimensional mapping table of frequency point × speed × modulation format). Then, according to this factor, it performs DFT transformation, frequency domain truncation (retaining K = L × (1-α) subcarriers), FDSS filtering, IFFT, and CP addition on the modulation symbols to generate the baseband time-domain signal. The UE sends data to the aNB via PUSCH, carrying the truncation factor index and the current modulation format identifier in the accompanying UCI to inform the base station of the truncation configuration used for this transmission.

[0096] After receiving the PUSCH, the base station first parses the α indication and modulation format information carried in the UCI, then configures the non-transparent FDSS receiving parameters according to the α and modulation format to ensure that the frequency domain spectrum shaping at the receiving end matches the spectrum truncation at the transmitting end, and finally performs data demodulation and decoding processing.

[0097] During communication, the UE continuously monitors speed changes, frequency changes, and modulation format updates. When a speed exceeds a threshold or a modulation format change is detected, the UE triggers a truncation factor reconfiguration process. If the reconfiguration is triggered by a speed exceeding a threshold, it takes effect after filtering by a hysteresis mechanism to prevent ping-pong effects. If the reconfiguration is triggered by a modulation format change, bypass hysteresis takes effect immediately. The UE re-looks up the table to select the target truncation factor adapted to the new state and indicates the updated α value to the aNB via UCI. The base station then reconfigures the non-transparent FDSS reception parameters accordingly, completing the adaptive switching and synchronization of the truncation factor.

[0098] The adaptive spectrum truncation configuration method based on speed and frequency awareness described in this application will be further explained below through specific embodiments: Example 1: Adaptive truncation in a high-speed railway scenario at 4GHz (300km / h, π / 2-BPSK modulation).

[0099] This embodiment describes the adaptive truncation process of the UE in a high-speed railway scenario (speed 300km / h, operating frequency 4HGHz).

[0100] The UE obtains its current speed information through Doppler frequency shift estimation, and the current frequency point is determined to be 4GHz from the RF configuration. During initial access, the UE's speed is relatively low (approximately 50 km / h), belonging to the medium-speed category, and the current modulation format is π / 2-BPSK, using a 25% truncation factor according to Table 1. When the train accelerates to 300 km / h, the UE's speed enters the high-speed category. The speed detection module detects that the speed has exceeded the threshold, triggering an adaptive switching of the truncation factor, changing the target truncation factor from 25% to 10% (10%-20% is recommended for π / 2-BPSK high-speed scenarios, with 10% being preferred). The UE indicates the new truncation factor to the aNB via UCI, and subsequent transmissions use the 10% truncation factor. The receiver configures the corresponding non-transparent FDSS parameters to ensure link reliability in high-speed scenarios.

[0101] Simulation data verification: At 4 GHz, 300 km / h, 16RB allocation, π / 2-BPSK modulation, and non-transparent Rx FDSS, the net gain of a 10% cutoff ratio is +0.35 dB, which is the best among all cutoff ratios; while the net gain of a 20% cutoff ratio is -0.07 dB, and the net gain of a 40% cutoff ratio is -0.45 dB. Adaptively switching to a 10% cutoff ratio can improve the gain by approximately 0.42 dB compared to a fixed 20% cutoff scheme.

[0102] Comparative experiment: If the transparent Rx FDSS mode is used, the net gain of all cutoff ratios at 300km / h is negative (-3.45dB to -4.45dB). Therefore, this invention explicitly requires the receiver to adopt a non-transparent FDSS mode in conjunction with the cutoff configuration of the transmitter.

[0103] Example 2: Adaptive truncation in urban microcell scenario at 4GHz frequency (3km / h, π / 2-BPSK modulation).

[0104] This embodiment describes the adaptive truncation process of the UE in an urban microcell scenario (low speed below 30km / h).

[0105] The UE obtains speed information (approximately 3 km / h) via a motion sensor, which falls under the low-speed category. The current modulation format is π / 2-BPSK. The UE selects a 40% truncation factor according to Table 1 (30%-40% is recommended for low-speed π / 2-BPSK; a higher value is chosen to maximize spectral efficiency). After verifying the UE speed via SRS measurement, the network side confirms the truncation factor configuration via DCI and instructs the receiver to use non-transparent FDSS. The UE performs a 40% truncation on the π / 2-BPSK modulation symbols, achieving higher spectral efficiency while ensuring coverage.

[0106] Simulation data verification: At 4 GHz, 3 km / h, 16 RB allocation, π / 2-BPSK modulation, and non-transparent Rx FDSS, the net gain of 40% cutoff ratio is +2.10 dB, which is the best among all cutoff ratios. This significantly improves system performance compared to the uncutoff scheme.

[0107] Example 3: Speed ​​threshold hysteresis mechanism.

[0108] This embodiment describes the specific implementation of the speed threshold hysteresis mechanism.

[0109] The UE's current speed is 28 km / h (low speed), operating frequency is 4 GHz, modulation format is π / 2-BPSK, and a 35% cutoff factor is used. The UE accelerates to 32 km / h, exceeding the low-speed to medium-speed transition handover threshold (30 km / h), triggering a switch to the medium-speed level, with the cutoff factor adjusted to 25%. Subsequently, the UE speed fluctuates between 28 and 32 km / h. Because it falls within the hysteresis range [25, 35] km / h, the cutoff factor remains constant at 25%, avoiding frequent handovers. When the UE decelerates to 24 km / h, it falls below the medium-speed to low-speed transition handover threshold (25 km / h), triggering a switch to the low-speed level, with the cutoff factor returning to 35%.

[0110] Example 4: Truncation factor update during modulation format switching.

[0111] This embodiment describes the adaptive updating of the truncation factor when the modulation format changes.

[0112] The UE's current speed is 3 km / h (low-speed class), operating frequency is 4 GHz, using π / 2-BPSK modulation, and a truncation factor of 35%. Due to improved channel quality, the base station scheduling decision switches the modulation format to QPSK to increase the transmission rate. The truncation factor decision module detects the modulation format change and redetermines the target truncation factor according to Table 1: QPSK is recommended to be ≤10% at low speed levels, and the system selects a 10% truncation factor. The base station sends the new truncation factor configuration (10%) to the UE via DCI and simultaneously adjusts the receiver's FDSS parameters. The UE performs subsequent transmissions according to the new configuration. In non-transparent FDSS mode, a positive gain of approximately 1.70 dB can be obtained with QPSK at 3 km / h using a 10% truncation factor, and approximately 0.7 dB of positive gain can be obtained at 120 km / h. Therefore, QPSK modulation combined with non-transparent FDSS can also achieve weak to moderate gain through appropriate truncation, but the gain amplitude is significantly lower than that of π / 2-BPSK modulation, and there is no positive gain in transparent FDSS mode, requiring strict limitation of usage conditions. If the UE maintains a 35% truncation factor, the QPSK performance will deteriorate further. This invention avoids this problem through a modulation format awareness mechanism.

[0113] Example 5: Mapping table adaptation at different frequency points (2.0 GHz frequency point vs 4 GHz frequency point).

[0114] This embodiment describes the adaptive process of the UE using different cutoff factors at different frequency points to illustrate the necessity of the frequency point awareness mechanism.

[0115] The UE's current speed is 300 km / h (high-speed class), the modulation format is π / 2-BPSK, and the initial operating frequency is 4.0 GHz. According to the 4 GHz mapping table (Table 1), the system selects a 10% cutoff factor. Subsequently, the UE undergoes a frequency switch and migrates to the 2.0 GHz frequency point for operation.

[0116] Because the 2.0 GHz frequency band has a smaller Doppler shift (fd = v·fc·cosθ / c, the Doppler shift at 2.0 GHz is about half that at 4 GHz) compared to the 4 GHz frequency band, and the channel time-selective fading is weaker, a slightly higher cutoff ratio can be used to obtain better spectral efficiency. The frequency change detection module detects the frequency switch and immediately (with bypass hysteresis) loads the pre-configured mapping table for the 2.0 GHz frequency band. According to the mapping table for the 2.0 GHz frequency band, the recommended cutoff factor for π / 2-BPSK at high speed is 15%-25%, and the system selects a 20% cutoff factor. The UE indicates the new cutoff factor configuration to the aNB via UCI, and the base station adjusts the non-transparent FDSS reception parameters accordingly.

[0117] As can be seen from the above embodiments, this application achieves dynamic binding between the truncation factor and the UE's moving speed by introducing a speed-aware adaptive truncation factor selection mechanism, effectively solving the technical problem of significant reduction in truncation gain in high-speed scenarios.

[0118] Next, referring to the accompanying drawings, an adaptive spectrum truncation configuration system based on speed and frequency awareness according to an embodiment of this application is described, which is used to implement the adaptive spectrum truncation configuration method based on speed and frequency awareness as described in any of the above schemes.

[0119] Figure 4 This is a structural diagram of an adaptive spectrum truncation configuration system based on speed and frequency awareness, according to an embodiment of this application.

[0120] like Figure 4 As shown, the adaptive spectrum truncation configuration system based on speed and frequency awareness includes: an information perception and acquisition module 100, a truncation factor decision module 200, an adaptive update module 300, and a transmit / receive linkage execution module 400.

[0121] Specifically, the information sensing and acquisition module 100 is used to acquire the moving speed, current operating frequency, and current modulation format of the transmitting device; The truncation factor decision module 200 is used to determine the current speed level of the transmitting device based on the moving speed, determine the corresponding target mapping table from multiple pre-configured mapping tables based on the current operating frequency, and determine the target truncation factor from the target mapping table based on the current modulation format. The adaptive update module 300 is used to detect whether the speed level, the current operating frequency, or the current modulation format has changed. If the speed level changes, it triggers an adaptive switching of the truncation factor based on a hysteresis mechanism, and updates the target truncation factor in a gradual manner after filtering by the hysteresis mechanism. If the current operating frequency or the current modulation format changes, it immediately triggers the redetering and switching of the truncation factor to directly update the target truncation factor. The transmit / receive linkage execution module 400 is used to synchronize the updated target truncation factor to the receiving device, perform spectrum truncation processing on the modulation symbols using the updated target truncation factor to generate a waveform, and send the waveform to the receiving device; wherein, the receiving device adopts a non-transparent frequency domain spectrum shaping (FDSS) mode in conjunction with the spectrum truncation to receive and process the waveform.

[0122] Specifically, such as Figure 5 As shown, the system uses a three-input architecture of speed information, frequency information, and modulation format. After speed level determination, frequency identification, and modulation format identification, it adopts two paths—initial decision and reconfiguration decision—to achieve adaptive configuration of the truncation factor. The initial decision path directly enters the truncation factor decision module to complete the initial configuration. In the reconfiguration decision path, the parameter change detection module continuously monitors changes in speed level, frequency, and modulation format during communication. After hysteresis filtering (speed trigger) or bypass hysteresis (frequency / modulation format trigger) by the handover control module, the truncation factor decision module is triggered to re-determine the decision. The signaling synchronization module synchronizes the truncation factor index, modulation format identifier, and non-transparent FDSS mode indication between the UE and the base station through UCI / DCI. The signal processing module finally performs the transmit-end spectrum truncation and receive-end FDSS linkage configuration to ensure matching of transmit and receive parameters.

[0123] Figure 6 A structural diagram of a transmitting device provided in an embodiment of this application. The transmitting device may include: The memory 501, the processor 502, and the computer program stored on the memory 501 and capable of running on the processor 502.

[0124] When the processor 502 executes the program, it implements the adaptive spectrum truncation configuration method based on speed and frequency awareness provided in the above embodiments.

[0125] Furthermore, the launching equipment also includes: Communication interface 503 is used for communication between memory 501 and processor 502.

[0126] The memory 501 is used to store computer programs that can run on the processor 502.

[0127] Memory 501 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0128] If the memory 501, processor 502, and communication interface 503 are implemented independently, then the communication interface 503, memory 501, and processor 502 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EIS) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0129] Optionally, in a specific implementation, if the memory 501, processor 502, and communication interface 503 are integrated on a single chip, then the memory 501, processor 502, and communication interface 503 can communicate with each other through an internal interface.

[0130] Processor 502 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0131] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described adaptive spectrum truncation configuration method based on speed and frequency awareness.

[0132] One embodiment of this application provides a computer program product, including a computer program that, when executed by a processor, implements the features described in this application. Figure 1 The corresponding embodiments provide an adaptive spectrum truncation configuration method based on speed and frequency awareness.

[0133] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0134] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0135] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0136] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable storage medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable storage medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable storage medium could be paper or other suitable media on which the program can be printed, since the program can be obtained electronically by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0137] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0138] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.

[0139] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0140] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

[0141] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for adaptive spectrum truncation configuration based on speed and frequency awareness, characterized in that, The adaptive spectrum truncation configuration method based on speed and frequency awareness includes: Obtain the transmitting equipment's moving speed, current operating frequency, and current modulation format; The speed level of the transmitting device is determined based on the moving speed, the corresponding target mapping table is determined from multiple pre-configured mapping tables based on the current operating frequency, and the target cutoff factor is determined from the target mapping table based on the current modulation format. The system detects whether the speed level, the current operating frequency, or the current modulation format has changed. If the speed level changes, it triggers an adaptive switching of the truncation factor based on a hysteresis mechanism. After filtering by the hysteresis mechanism, the target truncation factor is updated in a gradual manner. If the current operating frequency or the current modulation format changes, it immediately triggers the redetering and switching of the truncation factor to directly update the target truncation factor. The updated target truncation factor is synchronized to the receiving device, and the updated target truncation factor is used to perform spectrum truncation processing on the modulation symbols to generate a waveform, which is then sent to the receiving device. The receiving device is configured in conjunction with the non-transparent frequency domain spectrum shaping (FDSS) mode to receive and process the waveform.

2. The adaptive spectrum truncation configuration method based on speed and frequency awareness according to claim 1, characterized in that, The acquisition of the transmitting device's moving speed, current operating frequency, and current modulation format specifically includes: The moving speed of the transmitting device is obtained by estimation through Doppler frequency shift, and / or by calculation based on position and time information obtained through GNSS or cellular network positioning, and / or by base station assisted measurement and notification by downlink control information (DCI) or media access control layer control unit (MAC CE), and / or by estimation through cell handover frequency or beam switching frequency, and / or by acquisition through built-in motion sensors, and / or by estimation through uplink timing advance rate of change; The current operating frequency of the transmitting device is obtained. For the autonomous decision-making mode of the transmitting device, the current operating frequency is read from the local radio frequency configuration. For the control mode of the receiving device, the current operating frequency is obtained from the Radio Resource Control (RRC) or DCI sent by the receiving device. Alternatively, the current operating frequency is implicitly determined through the binding relationship between the frequency band indication and the pre-configured frequency point-mapping table. The current modulation format of the transmitting device is obtained. For the autonomous decision-making mode of the transmitting device, the current modulation format is read from the local modulation and coding scheme (MCS) configuration. For the control mode of the receiving device, the current modulation format is obtained from the DCI transmitted by the receiving device.

3. The adaptive spectrum truncation configuration method based on speed and frequency awareness according to claim 1, characterized in that, The steps of determining the current speed level of the transmitting device based on the moving speed, determining the corresponding target mapping table from multiple pre-configured mapping tables based on the current operating frequency, and determining the target cutoff factor from the target mapping table based on the current modulation format specifically include: The current speed level of the transmitting device is determined by comparing the moving speed with multiple preset speed thresholds. The speed levels include low speed, medium speed, high speed and ultra-high speed. Low speed is when the moving speed is less than a first speed threshold. Medium speed is when the moving speed is greater than or equal to the first speed threshold and less than a second speed threshold. High speed is when the moving speed is greater than or equal to the second speed threshold and less than a third speed threshold. Ultra-high speed is when the moving speed is greater than or equal to the third speed threshold. Based on the current operating frequency, a target mapping table corresponding to the current operating frequency is selected from multiple pre-configured mapping tables. Each mapping table corresponds to a different operating frequency or frequency band, and each mapping table contains the cutoff factor range corresponding to each speed level and each modulation format. The target mapping table is searched for a cutoff factor range that matches the speed level and the current modulation format, and a value within the cutoff factor range is selected as the target cutoff factor.

4. The adaptive spectrum truncation configuration method based on speed and frequency awareness according to claim 1, characterized in that, The system detects whether the speed level, the current operating frequency, or the current modulation format has changed. If the speed level has changed, it triggers an adaptive switching of the truncation factor based on a hysteresis mechanism. After filtering by the hysteresis mechanism, the target truncation factor is updated in a gradual manner. If the current operating frequency or the current modulation format changes, the redetering and switching of the truncation factor is immediately triggered to directly update the target truncation factor, specifically including: Obtain the current speed level, current operating frequency, and current modulation format, and compare them with the speed level, operating frequency, and modulation format corresponding to the last time the target truncation factor was determined, to determine whether there have been any changes. If the speed level changes, an adaptive switching of the cutoff factor based on a hysteresis mechanism is initiated. The switching condition is determined according to a preset hysteresis threshold. When the switching condition is met, the target cutoff factor is updated to the cutoff factor corresponding to the current speed level in a stepwise adjustment manner. If the current operating frequency changes, the target mapping table is reselected based on the changed current operating frequency, and the target cutoff factor is re-determined from the reselected target mapping table based on the current speed level and the current modulation format, so as to directly update the target cutoff factor. If the current modulation format changes, the target cutoff factor corresponding to the changed modulation format is re-determined from the current target mapping table based on the current speed level and the current operating frequency, so as to directly update the target cutoff factor.

5. The adaptive spectrum truncation configuration method based on speed and frequency awareness according to claim 1, characterized in that, The step of synchronizing the updated target truncation factor to the receiving device, performing spectral truncation processing on the modulation symbols using the updated target truncation factor to generate a waveform, and sending the waveform to the receiving device specifically includes: The updated target truncation factor is synchronized to the receiving device via signaling, wherein the signaling is one or more of uplink control information, downlink control information, or radio resource control signaling; Using the updated target truncation factor, a discrete Fourier transform is performed on the modulation symbols to obtain a frequency domain sequence. The actual number of subcarriers mapped is calculated based on the target truncation factor. A corresponding number of samples are selected from the frequency domain sequence and mapped onto the subcarriers. After frequency domain spectrum shaping, FDSS filtering, and inverse fast Fourier transform, a time domain waveform is generated. The time-domain waveform is sent to the receiving device.

6. The adaptive spectrum truncation configuration method based on speed and frequency awareness according to claim 5, characterized in that, The step of synchronizing the updated target truncation factor to the receiving device via signaling specifically includes: When the target cutoff factor is determined autonomously by the transmitting device, the target cutoff factor is indicated to the receiving device through uplink control information (UCI); When the target truncation factor is assisted or determined by the receiving device, a configuration instruction for the target truncation factor is received from the receiving device via downlink control information (DCI).

7. The adaptive spectrum truncation configuration method based on speed and frequency awareness according to claim 1, characterized in that, The process of acquiring the moving speed, current operating frequency, and current modulation format of the transmitting device also includes, prior to: Report the capability information of the transmitting equipment to the network side; Receive confirmation information returned by the network side, wherein the confirmation information is used to indicate the activation of speed and frequency-aware adaptive spectrum truncation configuration.

8. A speed and frequency-aware adaptive spectrum truncation configuration system, characterized in that, The speed and frequency-aware adaptive spectrum truncation configuration system is used to implement the speed and frequency-aware adaptive spectrum truncation configuration method according to any one of claims 1-7, wherein the speed and frequency-aware adaptive spectrum truncation configuration system comprises: The information sensing and acquisition module is used to acquire the moving speed, current operating frequency, and current modulation format of the transmitting equipment; The truncation factor decision module is used to determine the current speed level of the transmitting device based on the moving speed, determine the corresponding target mapping table from multiple pre-configured mapping tables based on the current operating frequency, and determine the target truncation factor from the target mapping table based on the current modulation format. An adaptive update module is used to detect whether the speed level, the current operating frequency, or the current modulation format has changed. If the speed level changes, an adaptive switching of the truncation factor based on a hysteresis mechanism is triggered, and the target truncation factor is updated gradually after filtering by the hysteresis mechanism. If the current operating frequency or the current modulation format changes, the redetering and switching of the truncation factor is immediately triggered to directly update the target truncation factor. The transmit / receive linkage execution module is used to synchronize the updated target truncation factor to the receiving device, use the updated target truncation factor to perform spectrum truncation processing on the modulation symbols to generate a waveform, and send the waveform to the receiving device; wherein, the receiving device adopts a non-transparent frequency domain spectrum shaping (FDSS) mode in conjunction with the spectrum truncation to receive and process the waveform.

9. A launching device, characterized in that, The transmitting device includes: a memory, a processor, and a speed and frequency-aware adaptive spectrum truncation configuration program stored in the memory and executable on the processor. When the speed and frequency-aware adaptive spectrum truncation configuration program is executed by the processor, it implements the steps of the speed and frequency-aware adaptive spectrum truncation configuration method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a speed and frequency-aware adaptive spectrum truncation configuration program, which, when executed by a processor, implements the steps of the speed and frequency-aware adaptive spectrum truncation configuration method as described in any one of claims 1-7.

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