Terminal access method and apparatus, communication device, medium, and product
By correcting the time-frequency adjustment parameters based on distance impact data in the satellite network, the problem of signal quality degradation in the satellite network is solved, the success rate of random access and user experience are improved, and the network optimization cost is reduced.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CHINA TELECOM CORP LTD TECHNOLOGY INNOVATION CENTER
- Filing Date
- 2025-10-09
- Publication Date
- 2026-07-09
Smart Images
Figure CN2025126519_09072026_PF_FP_ABST
Abstract
Description
Terminal access methods, devices, communication equipment, media and products
[0001] Related applications
[0002] This application claims priority to Chinese patent application No. 2024119691541, filed on December 30, 2024, entitled "Terminal Access Method, Apparatus, Communication Equipment, Medium and Product", the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of communication technology, and in particular to a terminal access method, apparatus, communication equipment, medium, and product. Background Technology
[0004] NTN (Non-Terrestrial Network) refers to a wireless communication network that does not rely on ground-based facilities but is built using satellites, airships, or other celestial objects.
[0005] As an important component of the NTN network, SN (Satellite Network) can utilize multiple satellites to form a broadband communication network coverage, making it suitable for sparsely populated countries and regions and solving the communication needs of areas without base stations.
[0006] In the scenario of random access via SN, the long distance between the satellite and the UE (User Equipment) results in significant signal loss and latency. Furthermore, the satellite is susceptible to atmospheric conditions, multipath propagation, and obstruction, making time and frequency adjustments difficult. This leads to a decrease in signal quality and affects the success rate of random access. Summary of the Invention
[0007] Therefore, it is necessary to provide a terminal access method, device, communication equipment, medium, and product to address the aforementioned technical problems, so as to improve the success rate of random terminal access and thereby enhance the communication experience of satellite network users.
[0008] In a first aspect, this application provides a terminal access method applied to a satellite base station, comprising:
[0009] Receive random access requests from UEs to be accessed; wherein, the random access requests include a preamble sequence and distance impact data of the UEs to be accessed;
[0010] Based on the preamble sequence, determine the time-frequency adjustment parameters; the time-frequency adjustment parameters include TA and / or FA;
[0011] Based on the distance impact data, the time-frequency adjustment parameters are corrected;
[0012] The corrected time-frequency adjustment parameters are sent to the UE to be accessed, so that the UE to be accessed can perform random access based on the uplink transmission parameters adjusted based on the corrected time-frequency adjustment parameters.
[0013] In some embodiments, correcting the time-frequency adjustment parameters based on distance impact data includes: determining an access correction factor based on the distance impact data; the access correction factor includes at least one of a location correction factor, a TA correction factor, and a FA correction factor; and correcting the time-frequency adjustment parameters based on the access correction factor.
[0014] In some embodiments, the distance influence data includes three-dimensional location information; determining the access correction factor based on the distance influence data includes: searching for a location correction factor corresponding to the three-dimensional location information according to a preset correspondence table; wherein the preset correspondence table includes the correspondence between different reference distance influence data and reference location correction factors.
[0015] In some embodiments, the distance impact data includes three-dimensional location information; determining the access correction factor based on the distance impact data includes: determining a first distance between the UE to be accessed and the satellite base station, and the signal propagation delay of the UE to be accessed, based on the three-dimensional location information; and determining the TA correction factor of the UE to be accessed based on the signal propagation delay, the signal transmission speed, and the first distance.
[0016] In some embodiments, determining the TA correction factor of the UE to be accessed based on the signal propagation delay, signal transmission speed, and a first distance includes: determining a TA correction factor determination function that matches the satellite type of the satellite base station; and inputting the signal propagation delay, signal transmission speed, and first distance as input data into the TA correction factor determination function to obtain the TA correction factor of the UE to be accessed.
[0017] In some embodiments, the distance influence data includes three-dimensional location information and three-dimensional map data at the location of the UE to be accessed; determining the access correction factor based on the distance influence data includes: determining a second distance between the UE to be accessed and surrounding environmental targets based on the three-dimensional map data and the three-dimensional location information, and target feature data corresponding to the surrounding environmental targets; and determining the FA correction factor of the UE to be accessed based on the target feature data and the second distance.
[0018] In some embodiments, determining the FA correction factor of the UE to be accessed based on target feature data and a second distance includes: determining an FA correction factor determination function that matches the satellite type of the satellite base station; and inputting the target feature data and the second distance as input data into the FA correction factor determination function to obtain the FA correction factor of the UE to be accessed.
[0019] In some embodiments, the time-frequency adjustment parameters are corrected according to the access correction factor, including: determining the difference between the desired access parameters and the time-frequency adjustment parameters; determining the adjustment parameter correction data based on the product of the difference and the access correction factor; and determining the corrected time-frequency adjustment parameters based on the sum of the time-frequency adjustment parameters and the adjustment parameter correction data.
[0020] In some embodiments, the method further includes: sending access feedback information to the UE to be accessed, so that the UE to be accessed re-executes the random access request transmission operation if the access feedback information indicates that access has failed.
[0021] Secondly, this application also provides a terminal access method, applied to a UE to be accessed, including:
[0022] A random access request is sent to the satellite base station so that the satellite base station can correct the time-frequency adjustment parameters determined based on the preamble sequence in the random access request, according to the distance influence data of the UE to be accessed in the random access request; the time-frequency adjustment parameters include TA and / or FA;
[0023] Receive the corrected time-frequency adjustment parameters sent by the satellite base station;
[0024] The uplink transmission parameters are adjusted according to the corrected time-frequency adjustment parameters, and random access is performed based on the adjusted uplink transmission parameters.
[0025] In some embodiments, the method further includes: receiving access feedback information sent by a satellite base station; and re-performing the random access request transmission operation if the access feedback information indicates access failure.
[0026] Thirdly, this application also provides a terminal access device configured in a satellite base station, comprising:
[0027] The first receiving module is used to receive a random access request from a user terminal (UE) to be accessed; wherein the random access request includes a preamble sequence and distance influence data of the UE to be accessed;
[0028] The first determining module is used to determine the time-frequency adjustment parameters based on the preamble sequence; the time-frequency adjustment parameters include TA and / or FA;
[0029] The correction module is used to correct the time-frequency adjustment parameters based on the distance influence data;
[0030] The first sending module is used to send the corrected time-frequency adjustment parameters to the UE to be accessed, so that the UE to be accessed can perform random access according to the uplink transmission parameters adjusted based on the corrected time-frequency adjustment parameters.
[0031] Fourthly, this application also provides a terminal access device configured on a UE to be accessed, comprising:
[0032] The second sending module is used to send a random access request to the satellite base station, so that the satellite base station can correct the time-frequency adjustment parameters determined based on the preamble sequence in the random access request according to the distance influence data of the UE to be accessed in the random access request; the time-frequency adjustment parameters include TA and / or FA;
[0033] The second receiving module is used to receive the corrected time-frequency adjustment parameters sent by the satellite base station;
[0034] The access module is used to adjust the uplink transmission parameters according to the corrected time-frequency adjustment parameters, and to perform random access based on the adjusted uplink transmission parameters.
[0035] Fifthly, this application also provides a communication device, including a memory, a transceiver, and a processor. The memory stores a computer program, the transceiver is used to receive or send data under the control of the processor, and the processor executes the computer program to implement the steps of the terminal access method provided in the first or second aspect of the embodiment.
[0036] Sixthly, this application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the terminal access method provided in the first or second aspect of the embodiment.
[0037] In a seventh aspect, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the terminal access method provided in the first or second aspect embodiments.
[0038] The aforementioned terminal access method, apparatus, communication equipment, medium, and product involve the UE (User Equipment) sending a random access request to the satellite base station. The satellite base station determines time-frequency adjustment parameters, including TA (Transmission Aspect) and / or FA (Front-End Association), based on the preamble sequence in the random access request. It then corrects these time-frequency adjustment parameters based on the distance impact data of the UE in the random access request. Since the corrected time-frequency adjustment parameters fully consider the influence of distance impact data, the accuracy of the correction result is improved. Correspondingly, the UE adjusts its uplink transmission parameters based on the more accurate corrected time-frequency adjustment parameters and performs random access based on these adjusted uplink transmission parameters. This eliminates changes in signal attenuation and propagation delay caused by distance-related factors, thereby reducing the impact of atmospheric, multipath, and obstruction factors, improving signal fading and interference, and thus increasing the success rate of random access in the satellite network. This, in turn, improves satellite network performance and user experience, and reduces the construction and optimization costs of the satellite network.
[0039] Details of one or more embodiments of this application are set forth in the following drawings and description. Other features, objects, and advantages of this application will become apparent from the specification, drawings, and claims. Attached Figure Description
[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.
[0041] Figure 1A is a schematic diagram of the application scenarios of the terminal access method in some embodiments;
[0042] Figure 1B is a flowchart illustrating the terminal access method in some embodiments;
[0043] Figure 2 is a flowchart illustrating the correction steps for time-frequency adjustment parameters in some embodiments;
[0044] Figure 3 is a flowchart illustrating the correction steps for the time-frequency adjustment parameters in some other embodiments;
[0045] Figure 4 is a flowchart illustrating the terminal access method in some other embodiments;
[0046] Figure 5 is a flowchart illustrating the terminal access method in some other embodiments;
[0047] Figure 6 is a structural block diagram of the terminal access device in some embodiments;
[0048] Figure 7 is a structural block diagram of the terminal access device in some other embodiments;
[0049] Figure 8 is an internal structure diagram of the communication device in some embodiments. Detailed Implementation
[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0051] To facilitate understanding, some of the terms used in this application will be introduced first.
[0052] NTN refers to a wireless communication network that does not rely on ground facilities but is built using satellites, high-altitude airships, or other celestial objects. The main functions of NTN include: (1) providing wide-area coverage: NTN can cover areas that cannot be covered by the ground, such as remote areas such as oceans, polar regions, deserts, mountains, and forests, to achieve global communication coverage; (2) rapid deployment: NTN does not require a large number of ground facilities and can be quickly deployed in disaster areas or emergencies to provide emergency communication services; (3) expanding network capacity: NTN can supplement the ground wireless network, improve the overall network capacity and performance by sharing the communication load of the ground network; (4) seamless roaming: NTN's global coverage capability enables users to roam seamlessly around the world without having to change SIM cards in different countries or regions; (5) supporting special applications: Due to NTN's global coverage capability and high-strength communication signal, it can be used to support the communication needs of special applications, such as aviation, marine and other fields.
[0053] Satellite communication (SN) is a network system that uses artificial satellites as repeaters or onboard base stations to transmit communication signals. Through communication satellites operating in low-Earth orbit, medium-Earth orbit, and high-Earth orbit, it achieves global communication coverage, providing wide-area coverage, wireless transmission, and global communication services. Satellite networks can be used to provide telephone, internet, television broadcasting, and other data communication services. Such networks can provide communication services in areas where terrestrial infrastructure is inadequate or unavailable, such as remote areas, oceans, and areas served by aircraft and spacecraft. Satellite networks can be a combination of ground-to-satellite communication (uplink) and satellite-to-ground communication (downlink), or they can be communication between satellites.
[0054] Timing Advance (TA) refers to the adjustment of the transmission timing of a mobile terminal in a mobile communication system to ensure clock synchronization between the mobile terminal and the base station. Because the distance between the mobile terminal and the base station varies, the signal transmission delay also differs. Therefore, the TA mechanism is needed to adjust the timing of the mobile terminal's signal transmission to ensure that the signal arrives at the base station at the correct time. TA adjustments are typically made in small, symbolic increments to correct signal transmission timing, thereby improving communication reliability and efficiency.
[0055] Frequency Adjustment (FA) refers to the adjustment of the transmission frequency of a mobile terminal in a mobile communication system to address issues such as frequency offset and multipath propagation. Signal transmission between the mobile terminal and the base station is affected by various factors, which can cause frequency offsets. These frequency offsets affect signal reception quality and communication performance. Therefore, the FA mechanism allows for minor adjustments to the mobile terminal's transmission frequency to correct frequency offsets and improve signal reception quality and communication performance.
[0056] Referring to Figure 1A, which illustrates the application scenario of the terminal access method, for random access scenarios in satellite networks such as 5G+ and 6G networks, the long distance between satellite 10 and UE20 leads to significant signal loss and latency. Furthermore, the system is susceptible to atmospheric interference, multipath propagation, and obstructions, making time and frequency adjustments difficult and resulting in signal quality degradation. This leads to a low success rate for random access, severely impacting the user experience of satellite networks. Of course, the networks involved in this application are not limited to 5G+ and 6G networks and can be extended to other networks as needed.
[0057] In view of this, this application provides a method for correcting time-frequency adjustment parameters, including TA and / or FA, based on the distance impact data of the UE to be accessed. This corrected method fully considers the impact of the distance impact data of the UE to be accessed and other factors related to that data, thereby improving the accuracy of the corrected time-frequency adjustment parameters. Correspondingly, the UE to be accessed adjusts its uplink transmission parameters based on the more accurate corrected time-frequency adjustment parameters and performs random access, improving the success rate of random access in satellite networks.
[0058] In some embodiments, as shown in FIG1B, a terminal access method is provided, applied to a satellite base station, including steps S110-S140.
[0059] S110, Receive a random access request from the UE to be accessed; wherein the random access request includes a preamble sequence and distance influence data of the UE to be accessed.
[0060] Among them, the random access request is a message sent by the UE to establish an uplink connection with the satellite base station to ensure that the UE can effectively access the network and obtain the necessary resource allocation before data transmission.
[0061] The preamble sequence included in the random access request is sent via PRACH (Physical Random Access Channel) to identify the access attempt of the UE to be accessed and to help the satellite base station detect whether the access request comes from the UE to be accessed.
[0062] The distance impact data, used to characterize data that directly or indirectly affects signal transmission distance, may include at least one of the following: the three-dimensional location information of the UE to be accessed and three-dimensional map data of the location of the UE to be accessed. Specifically, the three-dimensional location information characterizes the spatial location of the UE to be accessed in three-dimensional space, directly affecting the signal transmission distance; the three-dimensional map data carries information such as building information and terrain information of the environment in which the UE to be accessed is currently located, affecting the signal transmission distance through multipath propagation and obstruction.
[0063] For example, when a UE has an access requirement, it sends a random access request to the satellite base station; accordingly, the satellite base station receives the random access request for subsequent processing.
[0064] S120, determine the time-frequency adjustment parameters based on the preamble sequence; the time-frequency adjustment parameters include TA and / or FA.
[0065] Among them, the time and frequency adjustment parameters can be relevant parameters that affect the access of the UE to the satellite base station, and can include at least one of TA and FA.
[0066] For example, the leader sequence can be processed using at least one of the conventional processing methods to obtain TA and / or FA.
[0067] In some implementations, the TA at the current time can be obtained by detecting the correlation peaks of the leader sequence; or in some implementations, the FA at the current time can be obtained by performing spectral analysis on the leader sequence.
[0068] S130, based on the distance influence data, correct the time and frequency adjustment parameters to obtain the corrected time and frequency adjustment parameters.
[0069] In one embodiment, a first correspondence can be pre-established between different reference distance influence data and reference correction data of corresponding time-frequency adjustment parameters; based on the first correspondence, reference correction data of time-frequency adjustment parameters corresponding to the distance influence data is found, and the corresponding time-frequency adjustment parameters are corrected according to the search results to obtain the corrected time-frequency adjustment parameters.
[0070] In another embodiment, a second correspondence can be pre-constructed between different reference distance influence data and the correction results of the corresponding time-frequency adjustment parameters; based on the second correspondence, the correction results of the time-frequency adjustment parameters corresponding to the distance influence data are directly found, and the correction results are used as the corrected time-frequency adjustment parameters.
[0071] In another embodiment, a first correction function can be pre-constructed, with distance influence data as the independent variable and corrected time-frequency adjustment parameter data as the dependent variable. The distance influence data is input into the first correction function to obtain the corrected data corresponding to the time-frequency adjustment parameters. The corresponding time-frequency adjustment parameters are then corrected based on the corrected data to obtain the corrected time-frequency adjustment parameters. It is worth noting that this application does not impose any limitations on the determination method or presentation form of the first correction function.
[0072] In another embodiment, a second correction function can be pre-constructed, using distance influence data as the independent variable and the correction result of the time-frequency adjustment parameter as the dependent variable. The distance influence data is input into the second correction function to obtain the correction result corresponding to the time-frequency adjustment parameter, and this correction result is used as the corrected time-frequency adjustment parameter. It is worth noting that this application does not impose any limitations on the determination method or presentation form of the second correction function.
[0073] S140, send the corrected time-frequency adjustment parameters to the UE to be accessed, so that the UE to be accessed can perform random access according to the uplink transmission parameters adjusted based on the corrected time-frequency adjustment parameters.
[0074] For example, the satellite base station sends the corrected time-frequency adjustment parameters to the UE to be accessed; the UE adjusts its uplink transmission parameters based on the corrected time-frequency adjustment parameters and performs random access according to the adjusted uplink transmission parameters. The uplink transmission parameters may include uplink transmission time and / or uplink transmission frequency.
[0075] In some embodiments, to facilitate the UE's understanding of random access to the satellite network, the satellite base station may send access feedback information to the UE after it has performed random access, so that the UE can conduct normal communication activities if the access feedback information indicates successful access. Alternatively, the satellite base station may send access reference information to the UE, so that if the access feedback information indicates access failure, the UE can re-execute the random access request transmission operation, thereby re-correcting the time-frequency adjustment parameters.
[0076] The above embodiment involves the UE (User Equipment) sending a random access request to the satellite base station. The satellite base station determines time-frequency adjustment parameters, including TA (Transmission Aspect) and / or FA (Front-End Arrangement), based on the preamble sequence in the random access request. It then corrects these time-frequency adjustment parameters based on the distance impact data of the UE in the random access request. Since the corrected time-frequency adjustment parameters fully consider the influence of distance impact data, the accuracy of the correction result is improved. Correspondingly, the UE adjusts its uplink transmission parameters based on the more accurate corrected time-frequency adjustment parameters and performs random access based on these adjusted uplink transmission parameters. This eliminates changes in signal attenuation and propagation delay caused by distance-related factors, thereby reducing the impact of atmospheric, multipath, and obstruction factors, improving signal fading and interference, and thus increasing the success rate of random access in the satellite network. This, in turn, improves satellite network performance and user experience, and reduces the construction and optimization costs of the satellite network.
[0077] Based on the technical solutions of the above embodiments, this application also provides some embodiments in which the correction steps of the time-frequency adjustment parameters in S130 are refined.
[0078] Refer to the correction steps for the time-frequency adjustment parameters in Figure 2, including S210-S220.
[0079] S210, determine the access correction factor based on the distance influence data; the access correction factor includes at least one of the location correction factor, TA correction factor, or FA correction factor.
[0080] It is worth noting that the access correction factor is usually a value greater than -1 and less than 1.
[0081] Among them, the location correction factor is a distance-related correction factor used to weaken or eliminate the effects of signal attenuation, propagation delay changes and other effects caused by the distance between the UE to be accessed and the satellite base station.
[0082] In some embodiments, the distance influence data may include three-dimensional location information; correspondingly, the location correction factor may be determined in the following way: according to a preset correspondence table, the location correction factor corresponding to the three-dimensional location information is found; wherein, the preset correspondence table includes the correspondence between different reference distance influence data and reference location correction factors.
[0083] The preset correspondence table can be set or adjusted by technical personnel according to their needs or experience, or determined through extensive experimentation; this application does not impose any limitations on this. It is understood that determining the position correction factor corresponding to the three-dimensional position information of the UE to be accessed through data lookup improves the convenience of the position correction factor determination process. Furthermore, the preset correspondence table, as a carrier of the correspondence between different reference distance influence data and reference position correction factors, is easy to store and maintain.
[0084] Among them, the TA correction factor is a correction factor related to time adjustment, which is used to weaken or eliminate the effects of signal attenuation, propagation delay changes and other effects caused by environmental data related to transmission time.
[0085] In other embodiments, the distance impact data may include three-dimensional location information; accordingly, the TA correction factor may be determined as follows: based on the three-dimensional location information, a first distance between the UE to be accessed and the satellite base station, and the signal propagation delay of the UE to be accessed are determined; based on the signal propagation delay, the signal transmission speed, and the first distance, the TA correction factor of the UE to be accessed is determined.
[0086] For example, the difference between the three-dimensional location information of the UE to be accessed and the current location of the satellite base station can be used as the first distance between the UE to be accessed and the satellite base station to characterize the spatial distance. Alternatively, based on a distance fading model, the first distance between the UE to be accessed and the satellite base station can be determined according to the difference between the three-dimensional location information of the UE to be accessed and the current location of the satellite base station to characterize path loss or attenuation. The distance fading model can include at least one of the free space propagation model and the hyperbolic model, and this application does not limit it in any way.
[0087] For example, the difference between the three-dimensional location information of the UE to be accessed and the current location of the satellite base station can be determined, and the ratio of this difference to the signal transmission speed can be used as a signal propagation test. The signal transmission speed is typically the speed of light, i.e., 3 × 10⁻⁶. 8 m / s.
[0088] For example, signal propagation delay, signal transmission speed, and first distance can be used as input data and fed into the TA correction factor determination function to obtain the TA correction factor for the UE to be accessed. The TA correction factor determination function can be set or adjusted by technicians as needed, or determined repeatedly through numerous experiments. This application does not impose any limitations on the construction method or presentation format of the TA correction factor determination function.
[0089] In some embodiments, the TA correction factor determination function can be obtained by performing random access simulation based on the reference signal propagation delay, reference signal transmission speed and first reference distance collected in a large number of experiments, to obtain the reference TA correction factor; and by performing nonlinear fitting with the reference signal propagation delay, reference signal transmission speed and first reference distance as independent variables and the reference TA correction factor as dependent variable, the TA correction factor determination function can be obtained for use.
[0090] Because satellite communication systems of different satellite types produce different results in determining the TA correction factor, the influence of satellite type on the determination can be mitigated by constructing separate TA correction factor determination functions for each satellite type. Accordingly, when determining the TA correction factor, a TA correction factor determination function matching the satellite type of the satellite base station can be determined first. Then, signal propagation delay, signal transmission speed, and a first distance are input into the selected TA correction factor determination function to obtain the TA correction factor for the UE to be accessed.
[0091] In some implementations, different distance fading models correspond to different TA correction factor determination functions. It is worth noting that different propagation models and characteristics can lead to variations in signal transmission speed, attenuation effects, and other aspects. Fully considering these factors in the construction or selection of the TA correction factor determination function helps improve the accuracy of the final determined TA correction factor.
[0092] For example, the TA correction factor can be determined using the following formula: parameter_factor_TA=f(distance_1,propagation_delay,signal_speed);
[0093] Where parameter_factor_TA is the TA correction factor; f() is the TA correction factor determination function; distance_1 is the first distance; propagation_delay is the signal propagation delay; and signal_speed is the signal transmission speed.
[0094] Among them, the FA correction factor is a correction factor related to frequency adjustment, which is used to weaken or eliminate the effects of signal attenuation, propagation delay changes and other effects caused by environmental data related to the transmission frequency.
[0095] In some other embodiments, the distance influence data may include three-dimensional location information and three-dimensional map data at the location of the UE to be accessed; accordingly, the FA correction factor may be determined in the following manner: based on the three-dimensional map data and the three-dimensional location information, a second distance between the UE to be accessed and the surrounding environmental targets, and target feature data corresponding to the surrounding environmental targets are determined; based on the target feature data and the second distance, the FA correction factor of the UE to be accessed is determined.
[0096] The 3D map data includes information such as buildings and terrain surrounding the location of the UE to be accessed. The 3D map data can be environmental sensing data collected by environmental sensors located around the UE; alternatively, it can be a pre-drawn 3D map of the UE's location.
[0097] For example, based on 3D map data and 3D location information, surrounding environmental targets around the location of the UE to be accessed can be determined, which may include at least one of building targets and terrain targets. For instance, based on a traditional target detection network, environmental targets in the 3D map data can be identified, and environmental targets within a preset range of the location in the 3D location information can be used as surrounding environmental targets of the UE to be accessed.
[0098] For example, a second distance is determined based on the difference between the three-dimensional location information and the surrounding environmental targets, which is used to characterize the spatial distance between the UE to be accessed and the surrounding environmental targets.
[0099] In some embodiments, for each surrounding environmental target, the difference between the three-dimensional location information and the surrounding environmental target can be determined; the statistical results of the differences corresponding to each surrounding environmental target (such as average, maximum, minimum or median value, etc.) are used as the second distance.
[0100] In some implementations, features of surrounding environmental targets in 3D map data are extracted using traditional feature extraction networks to obtain target feature data. Alternatively, the feature extraction results of surrounding environmental targets output by the feature extraction subnetwork in the target detection network can be directly used as target feature data. The target feature data can include at least one of the following: target height, target category, or target outline, used to characterize the environmental characteristics of the environment in which the UE is currently located. It is worth noting that target types can be further subdivided into subcategories under building categories and terrain categories, etc.
[0101] In other implementations, the reflection and attenuation effects of surrounding environmental targets can be measured based on path loss models and building reflection models, and the determined impact values can be used as target feature data to characterize the impact of surrounding environmental targets on the signal transmission of the UE to be accessed.
[0102] For example, target feature data and second distance can be used as input data and fed into the FA correction factor determination function to obtain the TA correction factor for the UE to be accessed. The FA correction factor determination function can be set or adjusted by technicians as needed, or determined repeatedly through numerous experiments. This application does not impose any limitations on the construction method or presentation format of the FA correction factor determination function.
[0103] In some embodiments, the FA correction factor determination function can be obtained by performing random access simulation based on a large number of reference target feature data and a second reference distance collected in a large number of experiments to obtain a reference FA correction factor; using a large number of reference target feature data and a second reference distance as independent variables and the reference FA correction factor as dependent variable, a nonlinear fitting is performed to obtain the FA correction factor determination function for use.
[0104] Because satellite communication systems of different satellite types produce different results in determining the FA correction factor, the influence of satellite type on the determination can be mitigated by constructing separate FA correction factor determination functions for each satellite type. Accordingly, when determining the FA correction factor, a FA correction factor determination function matching the satellite type of the satellite base station can be determined first. Then, target feature data and the second distance are input into the selected TA correction factor determination function to obtain the TA correction factor for the UE to be accessed.
[0105] In some implementations, the path loss model and building reflection model corresponding to different FA correction factor determination functions can be at least partially different. It is worth noting that different propagation models and characteristics lead to varying degrees of signal reflection and attenuation. Fully considering these factors in the construction or selection process of the FA correction factor determination function helps improve the accuracy of the final determined FA correction factor.
[0106] For example, the FA correction factor can be determined using the following formula: parameter_factor_FA = g(distance_2, environment);
[0107] Where parameter_factor_FA is the FA correction factor; g() is the TA correction factor determination function; distance_2 is the second distance; and environment is the target feature data.
[0108] It is worth noting that the determination of the TA correction factor and FA correction factor takes into account factors such as distance, propagation delay and environmental characteristics, which more comprehensively reflects the influencing factors in the actual scenario, thereby improving the accuracy of the correction factor determination results and thus helping to improve the accuracy of the subsequent time-frequency adjustment parameter correction results.
[0109] S220 corrects the time-frequency adjustment parameters based on the access correction factor.
[0110] For example, at least one correction factor can be used to correct at least one time-frequency adjustment parameter to obtain the corrected time-frequency adjustment parameter.
[0111] In some implementations, the TA in the time-frequency adjustment parameter can be corrected according to at least one of the position correction factor, TA correction factor, or FA correction factor to obtain the corrected TA.
[0112] In other implementations, the FA in the time-frequency adjustment parameter can be corrected according to at least one of the position correction factor, TA correction factor, or FA correction factor to obtain the corrected FA.
[0113] In the above implementation method, by determining the access correction factor in at least one dimension based on the distance influence data, and by correcting the time-frequency adjustment parameters based on the access correction factor in at least one dimension, the richness and diversity of the correction method are improved.
[0114] Based on the technical solutions of the above embodiments, this application also provides some embodiments in which the step of correcting the time-frequency adjustment parameters according to the access correction factor in S220 is refined.
[0115] Refer to Figure 3 for the correction steps of the time-frequency adjustment parameters, including S310-S330.
[0116] S310, determine the difference between the desired access parameters and the time-frequency adjustment parameters.
[0117] The expected access parameters can be understood as time-frequency adjustment parameters that are pre-set based on the communication requirements of a specific communication scenario, which are the target values of the time-frequency adjustment parameters.
[0118] For example, when the time-frequency adjustment parameter includes TA, the desired access parameter may include the desired TA; when the time-frequency adjustment parameter includes FA, the desired access parameter may include the desired FA.
[0119] The difference between the desired access parameters and the time-frequency adjustment parameters measures the discrepancy between the current time-frequency adjustment parameters and the desired access parameters. It's important to note that this difference is a vector value, not a scalar value. The sign of this vector value directly affects the direction of subsequent adjustments to the time-frequency adjustment parameters.
[0120] S320, determine the adjustment parameter correction data based on the product of the difference and the access correction factor.
[0121] Among them, the adjustment parameter correction data is used as a numerical quantification result to characterize the adjustment of the time-frequency adjustment parameters.
[0122] In some implementations, if the number of access correction factors is 1, the product of the above difference and the access correction factor can be directly used as the adjustment parameter correction data.
[0123] In some other implementations, if the number of access correction factors is at least two, the above difference can be multiplied by the concatenation of each access correction factor as the adjustment parameter correction data.
[0124] It is worth noting that since the above difference is a vector value, the adjustment parameter correction data here is also a vector value, that is, it includes the parameter correction magnitude and the parameter correction direction.
[0125] S330 determines the corrected time-frequency adjustment parameters based on the sum of the time-frequency adjustment parameters and the adjustment parameter correction data.
[0126] In some implementations, the sum of the time-frequency adjustment parameter and the adjustment parameter correction data can be directly used as the corrected time-frequency adjustment parameter.
[0127] Alternatively, the product between the parameter correction factor and the preset adjustment ratio can be determined, and the sum of this product and the time-frequency adjustment parameter can be used as the corrected time-frequency adjustment parameter. The preset adjustment ratio can be set or adjusted by a technician based on needs or experience, or determined through extensive experimentation. It is worth noting that the preset adjustment ratios corresponding to different time-frequency adjustment parameters may be the same or different; this application does not impose any limitations on this.
[0128] In some implementations, the following formula can be used to adjust the TA: TA_adjusted=TA_current+K1*(TA_desired-TA_current)*location_factor*parameter_factor_TA*parameter_factor_FA;
[0129] Where TA_adjusted is the adjusted TA; TA_desired is the desired TA; TA_current is the TA before adjustment; location_factor is the location adjustment factor; parameter_factor_TA is the TA adjustment factor; parameter_factor_FA is the FA adjustment factor; and K1 is the first preset adjustment ratio.
[0130] In some other implementations, the following formula can be used to adjust the FA: FA_adjusted=FA_current+K2*(FA_desired-FA_current)*location_factor*parameter_factor_FA*parameter_factor_TA;
[0131] Wherein, FA_adjusted is the adjusted FA; FA_desired is the desired FA; FA_current is the FA before adjustment; location_factor is the location adjustment factor; parameter_factor_FA is the FA adjustment factor; parameter_factor_TA is the TA adjustment factor; and K2 is the second preset adjustment ratio.
[0132] The above embodiment introduces the difference between the desired access parameters and the time-frequency adjustment parameters as the basis for determining the adjustment parameter correction data. The adjusted parameter correction data is determined by multiplying this difference by the access correction factor. Finally, the corrected time-frequency adjustment parameters are determined by the sum of the time-frequency adjustment parameters and the adjusted parameter correction data. This determination process can be implemented through simple calculations, requiring low computational costs and achieving high efficiency. This helps improve the correction efficiency of time-frequency adjustment parameters, eliminates the need for computational expansion of existing satellite base stations, and is more universally applicable.
[0133] The technical solutions of the above embodiments use satellite base stations as the execution subject to describe the terminal access method in detail. The following will describe the terminal access method in detail using the UE to be accessed as the execution subject.
[0134] Referring to the terminal access method shown in Figure 4, applied to the UE to be accessed, it includes steps S410-S430.
[0135] S410, a random access request is sent to the satellite base station so that the satellite base station can correct the time-frequency adjustment parameters determined based on the preamble sequence in the random access request according to the distance influence data of the UE to be accessed in the random access request.
[0136] The time-frequency adjustment parameters include TA and / or FA.
[0137] Among them, the random access request is a message sent by the UE to establish an uplink connection with the satellite base station to ensure that the UE can effectively access the network and obtain the necessary resource allocation before data transmission.
[0138] The preamble sequence included in the random access request is sent via PRACH (Physical Random Access Channel) to identify the access attempt of the UE to be accessed and to help the satellite base station detect whether the access request comes from the UE to be accessed.
[0139] The distance impact data, used to characterize data that directly or indirectly affects signal transmission distance, may include at least one of the following: the three-dimensional location information of the UE to be accessed and three-dimensional map data of the location of the UE to be accessed. Specifically, the three-dimensional location information characterizes the spatial location of the UE to be accessed in three-dimensional space, directly affecting the signal transmission distance; the three-dimensional map data carries information such as building information and terrain information of the environment in which the UE to be accessed is currently located, affecting the signal transmission distance through multipath propagation and obstruction.
[0140] For example, when a UE has an access requirement, a random access request is sent to the satellite base station. Correspondingly, the satellite base station receives the random access request and, based on the time-frequency adjustment parameters determined by the preamble sequence in the random access request, and according to the distance influence data of the UE in the random access request, corrects the time-frequency adjustment parameters. It is worth noting that the steps related to the determination and correction of the time-frequency adjustment parameters by the satellite base station can be found in the relevant descriptions of the foregoing embodiments, and are not limited here.
[0141] S420 receives the corrected time and frequency adjustment parameters sent by the satellite base station.
[0142] S430 adjusts the uplink transmission parameters according to the corrected time-frequency adjustment parameters, and performs random access based on the adjusted uplink transmission parameters.
[0143] After the satellite base station corrects the time and frequency adjustment parameters, it sends the corrected time and frequency adjustment parameters to the UE to be accessed through the downlink channel. The UE to be accessed receives the corrected time and frequency adjustment parameters and adjusts the uplink transmission parameters based on the corrected time and frequency adjustment parameters. The UE to be accessed sends uplink information to the satellite base station according to the adjusted uplink transmission parameters to complete the subsequent operations of random access.
[0144] In some embodiments, the uplink transmission parameters may include the uplink transmission time; correspondingly, the uplink transmission time can be adjusted according to the modified TA. Alternatively, in some embodiments, the uplink transmission parameters may include the uplink transmission frequency; correspondingly, the uplink transmission frequency can be adjusted according to the modified FA.
[0145] In some embodiments, to facilitate the UE's understanding of random access to the satellite network, the satellite base station may send access feedback information to the UE after it has performed random access. Correspondingly, the UE receives the access feedback information sent by the satellite base station; if the access feedback information indicates successful access, normal communication activities are carried out. Alternatively, in some embodiments, if the access feedback information indicates access failure, the random access request is re-executed, thereby readjusting the time-frequency adjustment parameters.
[0146] Understandably, in the event of access failure, the UE re-executes the random access request transmission operation and corrects the TA and FA again until access is successful. This enables more accurate correction of the TA and FA, improves the accuracy of the correction results, and thus enhances system performance and stability.
[0147] In the above optional embodiment, the UE to be accessed sends a random access request to the satellite base station. The satellite base station determines time-frequency adjustment parameters, including TA and / or FA, based on the preamble sequence in the random access request, and corrects the time-frequency adjustment parameters based on the distance impact data of the UE to be accessed in the random access request. Since the corrected time-frequency adjustment parameters fully consider the impact of distance impact data, the accuracy of the correction result is improved. Accordingly, the UE to be accessed adjusts its uplink transmission parameters based on the more accurate corrected time-frequency adjustment parameters, and performs random access based on the adjusted uplink transmission parameters. This can eliminate changes in signal attenuation and propagation delay caused by distance-related factors, thereby reducing the impact of atmospheric, multipath, and obstruction factors, improving signal fading and interference, thus increasing the success rate of random access in the satellite network, thereby improving satellite network performance and user experience, and reducing the cost of satellite network construction and optimization.
[0148] Based on the technical solutions of the above embodiments, this application also provides an embodiment in which the terminal access method will be described in detail from the perspective of multi-party interaction.
[0149] Referring to the terminal access method shown in Figure 5, it includes:
[0150] S501, the UE sends a random access request to the satellite base station through the PRACH channel; the random access request includes the UE's three-dimensional location information, the three-dimensional map data of the current environment, and the preamble sequence;
[0151] S502, the satellite base station performs correlation peak detection on the preamble sequence to obtain the current TA; and performs spectrum analysis and frequency feature extraction on the preamble sequence to obtain the current FA;
[0152] S503, the satellite base station determines the position correction factor based on the three-dimensional position information; and determines the TA correction factor and FA correction factor based on the three-dimensional position information and the three-dimensional map data, respectively;
[0153] S504, the satellite base station corrects the current TA according to the TA correction formula; and corrects the current FA according to the FA correction formula;
[0154] S505, the satellite base station sends the corrected TA and corrected FA to the UE through the downlink channel;
[0155] S506, the UE adjusts the uplink transmission time according to the corrected TA; and adjusts the uplink transmission frequency according to the corrected FA;
[0156] S507, the UE sends uplink information to the satellite base station with the adjusted uplink transmission time and uplink transmission frequency, and completes the random access procedure;
[0157] S508, the satellite base station determines whether the UE has successfully accessed the network; if so, proceed to S509; otherwise, proceed to S510.
[0158] S509, the satellite base station sends an access success message to the UE;
[0159] S510, the satellite base station sends an access failure message to the UE; then returns to execute S501.
[0160] It is worth noting that the aforementioned terminal access process is compatible with different networks and application scenarios, and can adapt to both NTN pass-through mode and NTN regeneration mode, making it more universal, scalable, and stable. Furthermore, by adjusting the TA and FA, signal attenuation and propagation delay are eliminated, improving signal quality and thus increasing the success rate of satellite network access.
[0161] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.
[0162] Based on the same inventive concept, this application also provides a terminal access device for implementing the terminal access method described above. The solution provided by this device is similar to the implementation described in the above method; therefore, the specific limitations in one or more terminal access device embodiments provided below can be found in the limitations of the terminal access method described above, and will not be repeated here.
[0163] In one embodiment, as shown in FIG6, a terminal access device is provided, configured at a satellite base station, including: a first receiving module 610, a first determining module 620, a correcting module 630, and a first transmitting module 640. Wherein:
[0164] The first receiving module 610 is used to receive a random access request from the UE to be accessed; wherein the random access request includes a preamble sequence and distance influence data of the UE to be accessed;
[0165] The first determining module 620 is used to determine the time-frequency adjustment parameters based on the preamble sequence; the time-frequency adjustment parameters include TA and / or FA;
[0166] The correction module 630 is used to correct the time-frequency adjustment parameters based on the distance influence data;
[0167] The first sending module 640 is used to send the corrected time-frequency adjustment parameters to the UE to be accessed, so that the UE to be accessed can perform random access according to the uplink transmission parameters adjusted based on the corrected time-frequency adjustment parameters.
[0168] In some embodiments, the correction module 630 includes: a first determining unit, configured to determine an access correction factor based on distance influence data; the access correction factor includes at least one of a location correction factor, a TA correction factor, and a FA correction factor; and a correction unit, configured to correct the time-frequency adjustment parameters based on the access correction factor.
[0169] In some embodiments, the distance influence data includes three-dimensional location information; the first determining unit includes: a lookup unit, configured to look up a position correction factor corresponding to the three-dimensional location information according to a preset correspondence table; wherein the preset correspondence table includes the correspondence between different reference distance influence data and reference position correction factors.
[0170] In some embodiments, the distance influence data includes three-dimensional location information; the first determining unit includes: a first determining subunit, configured to determine a first distance between the UE to be accessed and the satellite base station and the signal propagation delay of the UE to be accessed based on the three-dimensional location information; and a second determining subunit, configured to determine the TA correction factor of the UE to be accessed based on the signal propagation delay, the signal transmission speed and the first distance.
[0171] In some embodiments, the second determining subunit is specifically used to determine a TA correction factor determination function that matches the satellite type of the satellite base station; and to input signal propagation delay, signal transmission speed and first distance as input data into the TA correction factor determination function to obtain the TA correction factor of the UE to be accessed.
[0172] In some embodiments, the distance influence data includes three-dimensional location information and three-dimensional map data at the location of the UE to be accessed; the first determining unit includes: a first obtaining subunit, configured to determine a second distance between the UE to be accessed and surrounding environmental targets, and target feature data corresponding to the surrounding environmental targets, based on the three-dimensional map data and the three-dimensional location information; and a third determining subunit, configured to determine the FA correction factor of the UE to be accessed based on the target feature data and the second distance.
[0173] In some embodiments, the third determining subunit is specifically used to determine an FA correction factor determination function that matches the satellite type of the satellite base station; and to input the target feature data and the second distance as input data into the FA correction factor determination function to obtain the FA correction factor of the UE to be accessed.
[0174] In some embodiments, the correction unit includes: a fourth determining subunit, configured to determine the difference between the desired access parameter and the time-frequency adjustment parameter; a fifth determining subunit, configured to determine adjustment parameter correction data based on the product of the difference and the access correction factor; and a sixth determining subunit, configured to determine the corrected time-frequency adjustment parameter based on the sum of the time-frequency adjustment parameter and the adjustment parameter correction data.
[0175] In some embodiments, the apparatus further includes a feedback module for sending access feedback information to the UE to be accessed, so that the UE to be accessed may re-execute the random access request transmission operation if the access feedback information indicates that access has failed.
[0176] In another optional embodiment, as shown in FIG7, a terminal access device is provided, configured on a UE to be accessed, including: a second transmitting module 710, a second receiving module 720, and an access module 730. Wherein:
[0177] The second sending module 710 is used to send a random access request to the satellite base station, so that the satellite base station can correct the time-frequency adjustment parameters determined based on the preamble sequence in the random access request according to the distance influence data of the UE to be accessed in the random access request; the time-frequency adjustment parameters include TA and / or FA;
[0178] The second receiving module 720 is used to receive the corrected time-frequency adjustment parameters sent by the satellite base station;
[0179] Access module 730 is used to adjust the uplink transmission parameters according to the corrected time-frequency adjustment parameters, and to perform random access based on the adjusted uplink transmission parameters.
[0180] In some embodiments, the apparatus further includes a third receiving module for receiving access feedback information sent by a satellite base station; and a second sending module 710 for re-executing the sending operation of a random access request when the access feedback information indicates that access has failed.
[0181] Each module in the aforementioned terminal access device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the communication device in hardware form or independent of it, or stored in the memory of the communication device in software form, so that the processor can call and execute the operations corresponding to each module.
[0182] In some embodiments, a communication device is provided, which may be a server, and its internal structure diagram may be as shown in Figure 8. The communication device includes a processor, a memory, a network interface, and a transceiver connected via a system bus. The processor of the communication device provides computing and control capabilities. The memory of the communication device includes a non-volatile storage medium and internal memory. The transceiver of the communication device performs operations of receiving or sending data under the control of the processor. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database of the communication device stores data such as uplink and downlink SMS messages. The network interface of the communication device is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, it implements a terminal access method.
[0183] Those skilled in the art will understand that the structure shown in Figure 8 is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the communication device to which the present application is applied. Specific communication devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.
[0184] In some embodiments, a communication device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the processing logic in the computer program to implement the steps of the terminal access method provided in the embodiments of this application.
[0185] In some embodiments, a computer-readable storage medium or computer program product is provided, on which a computer program is stored, wherein the processing logic in the computer program, when executed by a processor, implements the steps of the terminal access method provided in the embodiments of this application.
[0186] It should be noted that the user information (including but not limited to user terminal information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.
[0187] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.
[0188] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0189] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.
Claims
1. A terminal access method applied to a satellite base station, comprising: Receive a random access request from a user terminal (UE) to be accessed; wherein the random access request includes a preamble sequence and distance influence data of the UE to be accessed; Based on the preamble sequence, time-frequency adjustment parameters are determined; the time-frequency adjustment parameters include time adjustment TA and / or frequency adjustment FA. Based on the distance influence data, the time-frequency adjustment parameters are corrected; and The corrected time-frequency adjustment parameters are sent to the UE to be accessed, so that the UE to be accessed can perform random access according to the uplink transmission parameters adjusted based on the corrected time-frequency adjustment parameters.
2. The method according to claim 1, wherein, The step of correcting the time-frequency adjustment parameters based on the distance influence data includes: Based on the distance impact data, an access correction factor is determined; the access correction factor includes at least one of a location correction factor, a TA correction factor, or a FA correction factor; and The time-frequency adjustment parameters are corrected based on the access correction factor.
3. The method according to claim 2, wherein, The distance impact data includes three-dimensional location information; determining the access correction factor based on the distance impact data includes: According to the preset correspondence table, find the position correction factor corresponding to the three-dimensional position information; The preset correspondence table includes the correspondence between different reference distance influence data and reference position correction factors.
4. The method according to claim 2, wherein, The distance impact data includes three-dimensional location information; determining the access correction factor based on the distance impact data includes: Based on the three-dimensional location information, a first distance between the UE to be accessed and the satellite base station, and the signal propagation delay of the UE to be accessed are determined; and The TA correction factor of the UE to be accessed is determined based on the signal propagation delay, signal transmission speed, and the first distance.
5. The method according to claim 4, wherein, The step of determining the TA correction factor for the UE to be accessed based on the signal propagation delay, signal transmission speed, and the first distance includes: Determine the TA correction factor determination function that matches the satellite type of the satellite base station; and The signal propagation delay, signal transmission speed, and the first distance are used as input data and input to the TA correction factor determination function to obtain the TA correction factor of the UE to be accessed.
6. The method according to claim 2, wherein, The distance impact data includes three-dimensional location information and three-dimensional map data of the location of the UE to be accessed; The step of determining the access correction factor based on the distance influence data includes: Based on the three-dimensional map data and three-dimensional location information, a second distance is determined between the UE to be accessed and the surrounding environmental targets, as well as the target feature data corresponding to the surrounding environmental targets; and The FA correction factor of the UE to be accessed is determined based on the target feature data and the second distance.
7. The method according to claim 6, wherein, Based on the target feature data and the second distance, the FA correction factor of the UE to be accessed is determined, including: Determine the FA correction factor determination function that matches the satellite type of the satellite base station; The target feature data and the second distance are used as input data and input to the FA correction factor determination function to obtain the FA correction factor of the UE to be accessed.
8. The method according to any one of claims 2-7, wherein, The step of correcting the time-frequency adjustment parameters according to the access correction factor includes: Determine the difference between the desired access parameters and the time-frequency adjustment parameters; The adjustment parameter correction data is determined based on the product of the difference and the access correction factor; and The corrected time-frequency adjustment parameters are determined based on the sum of the time-frequency adjustment parameters and the adjustment parameter correction data.
9. The method according to any one of claims 1-7, wherein, The method further includes: Access feedback information is sent to the UE to be accessed, so that if the access feedback information indicates that access has failed, the UE to be accessed will re-execute the random access request sending operation.
10. A terminal access method, applied to a UE to be accessed, comprising: A random access request is sent to a satellite base station, so that the satellite base station corrects the time-frequency adjustment parameters determined based on the preamble sequence in the random access request according to the distance influence data of the UE to be accessed in the random access request; the time-frequency adjustment parameters include TA and / or FA; Receive the corrected time-frequency adjustment parameters sent by the satellite base station; and The uplink transmission parameters are adjusted according to the corrected time-frequency adjustment parameters, and random access is performed based on the adjusted uplink transmission parameters.
11. The method according to claim 10, wherein, The method further includes: Receive access feedback information sent by the satellite base station; If the access feedback information indicates that the access has failed, the random access request sending operation will be re-executed.
12. A terminal access device, configured in a satellite base station, comprising: The first receiving module is used to receive a random access request from a UE to be accessed; wherein the random access request includes a preamble sequence and distance influence data of the UE to be accessed; The first determining module is used to determine time-frequency adjustment parameters based on the preamble sequence; the time-frequency adjustment parameters include TA and / or FA; The correction module is used to correct the time-frequency adjustment parameters based on the distance influence data; and The first sending module is used to send the corrected time-frequency adjustment parameters to the UE to be accessed, so that the UE to be accessed can perform random access according to the uplink transmission parameters adjusted based on the corrected time-frequency adjustment parameters.
13. A terminal access device, configured on a UE to be accessed, comprising: The second sending module is used to send a random access request to the satellite base station, so that the satellite base station can correct the time-frequency adjustment parameters determined based on the preamble sequence in the random access request according to the distance influence data of the UE to be accessed in the random access request; the time-frequency adjustment parameters include TA and / or FA; The second receiving module is used to receive the corrected time-frequency adjustment parameters sent by the satellite base station; and The access module is used to adjust the uplink transmission parameters according to the corrected time-frequency adjustment parameters, and to perform random access based on the adjusted uplink transmission parameters.
14. A communication device, comprising a memory, a transceiver, and a processor, wherein the memory stores a computer program, wherein... The transceiver is used to receive or send data under the control of the processor, wherein the processor, when executing the computer program, implements the steps of the method according to any one of claims 1-11.
15. A computer-readable storage medium having a computer program stored thereon, wherein, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1-11.
16. A computer program product comprising a computer program, wherein, When executed by a processor, the computer program implements the steps of the method described in any one of claims 1-11.