Terminal access method and device, communication equipment, medium and product

Abstract

The invention relates to a terminal access method and device, communication equipment, a medium and a product, and relates to the technical field of communication. The method is applied to a satellite base station, and comprises the following steps: receiving a random access request of UE to be accessed; wherein the random access request comprises a preamble sequence and distance influence data of the UE to be accessed; determining a time-frequency adjustment parameter according to the leader sequence; the time-frequency adjustment parameters comprise TA and / or FA; correcting the time-frequency adjustment parameter according to the distance influence data; and sending the corrected time-frequency adjustment parameter to the UE to be accessed, so that the UE to be accessed performs random access according to the uplink transmission parameter adjusted based on the corrected time-frequency adjustment parameter. By adopting the technical scheme, changes of signal attenuation, propagation delay and the like caused by distance-related factors can be eliminated, so that the influence of factors such as atmosphere, multipath, shielding and the like can be reduced, the conditions of signal fading and interference are improved, and the random access success rate of the satellite network is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a terminal access method, device, communication equipment, medium and product. Background Art

[0002] NTN (Non-Terrestrial Network) 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.

[0003] As an important component of the NTN network, SN (Satellite Network) can use multiple satellites to form broadband communication network coverage, which is suitable for countries and regions with vast land and sparse population, and can solve the communication needs in areas without base stations.

[0004] In the SN random access scenario, due to the long distance between the satellite and the UE (User Equipment), large loss and delay, and susceptibility to factors such as atmosphere, multipath and obstruction, it is difficult to adjust the time and frequency, resulting in a decrease in signal quality and affecting the success rate of random access. Summary of the invention

[0005] Based on this, it is necessary to provide a terminal access method, device, communication equipment, medium and product to address the above technical problems, so as to improve the random access success rate of the terminal and thereby enhance the communication experience of satellite network users.

[0006] In a first aspect, the present application provides a terminal access method, which is applied to a satellite base station, comprising:

[0007] receiving a random access request from a UE to be accessed; wherein the random access request includes a preamble sequence and distance impact data of the UE to be accessed;

[0008] Determine a time-frequency adjustment parameter according to the leading sequence; the time-frequency adjustment parameter includes TA and / or FA;

[0009] According to the distance impact data, the time-frequency adjustment parameters are modified;

[0010] The modified time-frequency adjustment parameter is sent to the UE to be accessed, so that the UE to be accessed performs random access according to the uplink transmission parameter adjusted based on the modified time-frequency adjustment parameter.

[0011] In one of the embodiments, the time-frequency adjustment parameters are corrected according to the distance impact data, including: determining an access correction factor according to the distance impact data; the access correction factor includes at least one of a position correction factor, a TA correction factor and a FA correction factor; and correcting the time-frequency adjustment parameters according to the access correction factor.

[0012] In one of the embodiments, the distance influence data includes three-dimensional position information; determining the access correction factor based on the distance influence data includes: searching for the position correction factor corresponding to the three-dimensional position 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.

[0013] In one of the embodiments, the distance impact data includes three-dimensional position information; based on the distance impact data, an access correction factor is determined, including: based on the three-dimensional position information, determining a first distance between the UE to be accessed and the satellite base station, and a signal propagation delay of the UE to be accessed; based on the signal propagation delay, the signal transmission speed and the first distance, determining a TA correction factor of the UE to be accessed.

[0014] In one of the embodiments, a TA correction factor of the UE to be accessed is determined based on a signal propagation delay, a signal transmission speed, and a first distance, including: determining a TA correction factor determination function that matches the satellite type of the satellite base station; inputting the signal propagation delay, the signal transmission speed, and the first distance as input data into the TA correction factor determination function to obtain the TA correction factor of the UE to be accessed.

[0015] In one of the embodiments, the distance impact data includes three-dimensional position information and three-dimensional map data at the location of the UE to be accessed; based on the distance impact data, an access correction factor is determined, including: based on the three-dimensional map data and the three-dimensional position information, determining a second distance between the UE to be accessed and the surrounding environment targets of the UE to be accessed, and target feature data corresponding to the surrounding environment targets; based on the target feature data and the second distance, determining the FA correction factor of the UE to be accessed.

[0016] In one of the embodiments, the FA correction factor of the UE to be accessed is determined based on the target characteristic data and the second distance, including: determining a FA correction factor determination function that matches the satellite type of the satellite base station; inputting the target characteristic 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.

[0017] In one of the embodiments, the time-frequency adjustment parameter is corrected according to the access correction factor, including: determining the difference between the expected access parameter and the time-frequency adjustment parameter; determining the adjustment parameter correction data according to the product of the difference and the access correction factor; and determining the corrected time-frequency adjustment parameter according to the sum of the time-frequency adjustment parameter and the adjustment parameter correction data.

[0018] In one of the 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 sending operation of the random access request when the access feedback information indicates that the access fails.

[0019] In a second aspect, the present application also provides a terminal access method, which is applied to a UE to be accessed, including:

[0020] Sending a random access request to a satellite base station, so that the satellite base station modifies the time-frequency adjustment parameters determined based on the preamble sequence in the random access request according to the distance impact data of the UE to be accessed in the random access request; the time-frequency adjustment parameters include TA and / or FA;

[0021] receiving the corrected time and frequency adjustment parameters sent by the satellite base station;

[0022] 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.

[0023] In one of the embodiments, the method further includes: receiving access feedback information sent by the satellite base station; and re-executing the sending operation of the random access request when the access feedback information indicates that the access fails.

[0024] In a third aspect, the present application further provides a terminal access device, which is configured in a satellite base station, including:

[0025] A 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 impact data of the UE to be accessed;

[0026] A first determination module is used to determine a time-frequency adjustment parameter according to a leading sequence; the time-frequency adjustment parameter includes TA and / or FA;

[0027] A correction module, used for correcting the time-frequency adjustment parameters according to the distance impact data;

[0028] The first sending module is used to send the modified time-frequency adjustment parameter to the UE to be accessed, so that the UE to be accessed performs random access according to the uplink transmission parameter adjusted based on the modified time-frequency adjustment parameter.

[0029] In a fourth aspect, the present application further provides a terminal access device, configured on a UE to be accessed, including:

[0030] The second sending module is used to send a random access request to the satellite base station, so that the satellite base station modifies the time-frequency adjustment parameters determined based on the leading sequence in the random access request according to the distance impact data of the UE to be accessed in the random access request; the time-frequency adjustment parameters include TA and / or FA;

[0031] A second receiving module is used to receive the corrected time-frequency adjustment parameters sent by the satellite base station;

[0032] The access module is used to adjust the uplink transmission parameters according to the modified time-frequency adjustment parameters, and perform random access based on the adjusted uplink transmission parameters.

[0033] In the fifth aspect, the present 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 implements the steps of the terminal access method provided in the first aspect or the second aspect when executing the computer program.

[0034] In a sixth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the terminal access method provided in the first aspect or the second aspect embodiment.

[0035] In a seventh aspect, the present application further provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the terminal access method provided in the first aspect or the second aspect embodiment.

[0036] The above-mentioned terminal access method, device, communication equipment, medium and product send a random access request to the satellite base station through the UE to be accessed. The satellite base station determines the time-frequency adjustment parameters including TA and / or FA according to the leading sequence in the random access request, and corrects the time-frequency adjustment parameters according to 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 the distance impact data, the accuracy of the correction result is improved. Accordingly, the UE to be accessed adjusts the uplink transmission parameters based on the more accurate corrected time-frequency adjustment parameters, and performs random access based on the adjusted uplink transmission parameters, which can eliminate changes in signal attenuation and propagation delay caused by distance-related factors, thereby reducing the influence of factors such as atmosphere, multipath and occlusion, improving signal fading and interference, thereby improving the satellite network random access success rate, thereby improving satellite network performance and user perception, and reducing satellite network construction and optimization costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1A A schematic diagram of an application scenario of a terminal access method in an embodiment;

[0038] Figure 1B A schematic diagram of a process flow of a terminal access method in an embodiment;

[0039] Figure 2A schematic flow chart of a step of modifying a time-frequency adjustment parameter in one embodiment;

[0040] Figure 3 is a flow chart of a step of modifying a time-frequency adjustment parameter in another embodiment;

[0041] Figure 4 is a flow chart of a terminal access method in another embodiment;

[0042] Figure 5 is a flow chart of a terminal access method in another embodiment;

[0043] Figure 6 is a structural block diagram of a terminal access device in an embodiment;

[0044] Figure 7 is a structural block diagram of a terminal access device in another embodiment;

[0045] Figure 8 FIG. 4 is a diagram showing the internal structure of a communication device in one embodiment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0047] To facilitate understanding, some nouns involved in this application are first introduced.

[0048] 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: Providing wide-area coverage: NTN can cover areas that cannot be covered by the ground, such as oceans, polar regions, deserts, mountains, forests and other remote areas, to achieve global communication coverage. Rapid deployment: NTN does not require a large number of ground facilities and can be quickly deployed in disaster areas or emergency situations to provide emergency communication services. Expanding network capacity: NTN can serve as a supplement to ground wireless networks, improving overall network capacity and performance by sharing the communication load of ground networks. 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. Supporting special applications: Because NTN has global coverage capabilities and high-intensity communication signals, it can be used to support special applications, such as communication needs in aviation, oceans and other fields.

[0049] SN is a network system that uses artificial satellites as repeaters or onboard base stations to transmit communication signals. It achieves global communication coverage through communication satellites operating in low, medium and high orbits, and can provide 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. This network can provide communication services in areas where ground infrastructure is imperfect or cannot be covered, such as remote areas, oceans, aircraft and spacecraft. Satellite networks can be a combination of ground-to-satellite communication (uplink) and satellite-to-ground communication (downlink), or communication between satellites.

[0050] TA (Timing Advance) refers to the need to adjust the sending time of the mobile terminal in order to ensure the clock synchronization between the mobile terminal and the base station in the mobile communication system. Since the distance between the mobile terminal and the base station is different, the delay of signal transmission is also different, so the time when the mobile terminal sends the signal needs to be adjusted through the TA mechanism to ensure that the signal can reach the base station at the correct time. The adjustment of TA is usually a small time adjustment in symbol units to correct the transmission timing of the signal, thereby improving the reliability and efficiency of communication.

[0051] FA (Frequency Adjust) refers to the need to adjust the transmission frequency of the mobile terminal in order to deal with problems such as frequency offset and multipath propagation in mobile communication systems. Signal transmission between the mobile terminal and the base station is affected by many factors, which may cause the frequency of the signal to shift, and the frequency offset will affect the signal reception quality and communication performance. Therefore, the FA mechanism can be used to make slight adjustments to the transmission frequency of the mobile terminal to correct the frequency offset and improve the signal reception quality and communication performance.

[0052] See also Figure 1A The schematic diagram of the application scenario of the terminal access method shown in the figure is for the random access scenario of the satellite network in the 5G+ network and the 6G network. Due to the long distance between the satellite 10 and the UE 20, the loss is large, the delay is large, and it is susceptible to factors such as the atmosphere, multipath and obstruction, which makes it difficult to adjust the time and frequency, and the signal quality is reduced, resulting in a low success rate of random access, which seriously affects the user experience of the satellite network. Of course, the network involved in this application is not limited to the 5G+ network and the 6G network, and can also be expanded to other networks as needed.

[0053] In view of this, the present application provides a method for correcting the time-frequency adjustment parameters including TA and / or FA based on the distance impact data of the UE to be accessed, so that the corrected time-frequency adjustment parameters fully consider the influence of the distance impact data of the UE to be accessed and other factors associated with the distance impact data on the time-frequency adjustment parameters, thereby improving the accuracy of the corrected time-frequency adjustment parameters. Accordingly, the UE to be accessed adjusts the uplink transmission parameters based on the more accurate corrected time-frequency adjustment parameters and performs random access, thereby improving the success rate of random access to the satellite network.

[0054] In an alternative embodiment, if Figure 1B As shown, a terminal access method is provided, which is applied to a satellite base station, including:

[0055] S110, receiving a random access request from a UE to be accessed; wherein the random access request includes a preamble sequence and distance impact data of the UE to be accessed.

[0056] Among them, the random access request is a message sent by the UE to be accessed when attempting to establish an uplink connection with the satellite base station, so as to ensure that the UE to be accessed can effectively access the network and obtain necessary resource allocation before data transmission.

[0057] The random access request may include a preamble sequence which is sent through a PRACH (Physical Random Access Channel) to identify an access attempt of a UE to be accessed and to help a satellite base station detect whether the access request comes from the UE to be accessed.

[0058] The distance impact data is used to characterize data that directly or indirectly affects the signal transmission distance, and may include at least one of the three-dimensional location information of the UE to be accessed and the three-dimensional map data at the location of the UE to be accessed. The three-dimensional location information is used to characterize the spatial location information of the UE to be accessed in three-dimensional space, which directly affects the signal transmission distance; the three-dimensional map data carries information such as building information and terrain information of the current environment of the UE to be accessed, which affects the signal transmission distance through multipath and obstruction.

[0059] Exemplarily, when the UE to be accessed has an access demand, a random access request is sent to the satellite base station; correspondingly, the satellite base station receives the random access request for subsequent processing.

[0060] S120, determining a time-frequency adjustment parameter according to the preamble sequence; the time-frequency adjustment parameter includes TA and / or FA.

[0061] Among them, the time-frequency adjustment parameters may be relevant parameters that affect the access of the UE to be accessed to the satellite base station, and may include at least one of TA and FA.

[0062] Exemplarily, the leading sequence may be processed by at least one of the conventional processing methods to obtain TA and / or FA.

[0063] Optionally, the TA at the current moment may be obtained by performing correlation peak detection on the leading sequence; or optionally, the FA at the current moment may be obtained by performing spectrum analysis on the leading sequence.

[0064] S130: Modify the time-frequency adjustment parameters according to the distance impact data.

[0065] In an optional embodiment, a first correspondence between different reference distance influence data and reference correction data of corresponding time-frequency adjustment parameters can be pre-constructed; based on the first correspondence, the reference correction data of the time-frequency adjustment parameters corresponding to the distance influence data are searched, and the corresponding time-frequency adjustment parameters are corrected according to the search results.

[0066] In another optional embodiment, a second correspondence between different reference distance influence data and the correction results of the corresponding time-frequency adjustment parameters may be pre-constructed; based on the second correspondence, the correction results of the time-frequency adjustment parameters corresponding to the distance influence data are directly searched.

[0067] In another optional embodiment, a first correction function with the distance influence data as an independent variable and the correction data of the time-frequency adjustment parameter as a dependent variable can also be pre-constructed; the distance influence data is input as input data into the first correction function to obtain the correction data corresponding to the time-frequency adjustment parameter; and the corresponding time-frequency adjustment parameter is corrected according to the correction data corresponding to the time-frequency adjustment parameter. It is worth noting that the present application does not impose any restrictions on the determination method and presentation form of the first correction function.

[0068] In another optional embodiment, a second correction function may be pre-constructed with the distance influence data as an independent variable and the correction result of the time-frequency adjustment parameter as a dependent variable; the distance influence data is input as input data into the second correction function to obtain the correction result corresponding to the time-frequency adjustment parameter. It is worth noting that the present application does not impose any limitation on the determination method and presentation form of the second correction function.

[0069] S140: Send the modified time-frequency adjustment parameter to the UE to be accessed, so that the UE to be accessed performs random access according to the uplink transmission parameter adjusted based on the modified time-frequency adjustment parameter.

[0070] Exemplarily, the satellite base station sends the modified time-frequency adjustment parameter to the UE to be accessed; the UE to be accessed adjusts the uplink transmission parameter based on the modified time-frequency adjustment parameter, and performs random access according to the adjusted uplink transmission parameter. The uplink transmission parameter may include uplink transmission time and / or uplink transmission frequency.

[0071] In an optional embodiment, in order to facilitate the UE to be accessed to understand the random access situation of the satellite network, the satellite base station may also send access feedback information to the UE to be accessed after the UE to be accessed performs random access, so that the UE to be accessed can normally carry out communication activities when the access feedback information indicates that the access is successful. Or optionally, the UE to be accessed may be sent access reference information so that the UE to be accessed can re-execute the sending operation of the random access request when the access feedback information indicates that the access fails, thereby re-correcting the time-frequency adjustment parameters.

[0072] 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 the time-frequency adjustment parameters including TA and / or FA according to the leading sequence in the random access request, and corrects the time-frequency adjustment parameters according to the distance impact data of the UE to be accessed in the random access request. The corrected time-frequency adjustment parameters fully consider the impact of the distance impact data, thereby improving the accuracy of the correction result. Accordingly, the UE to be accessed adjusts the uplink transmission parameters based on the more accurate corrected time-frequency adjustment parameters, and performs random access based on the adjusted uplink transmission parameters, which can eliminate changes in signal attenuation and propagation delay caused by distance-related factors, thereby reducing the impact of factors such as atmosphere, multipath and occlusion, improving signal fading and interference, thereby improving the satellite network random access success rate, thereby improving satellite network performance and user perception, and reducing satellite network construction and optimization costs.

[0073] Based on the technical solutions of the above embodiments, the present application further provides an optional embodiment. In this optional embodiment, the step of correcting the time-frequency adjustment parameters in S130 is refined.

[0074] See also Figure 2 The correction steps of the time-frequency adjustment parameters include:

[0075] S210, determining an access correction factor according to 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.

[0076] It is worth noting that the access correction factor is usually a value greater than -1 and less than 1.

[0077] Among them, the position correction factor is a correction factor related to the distance, which is used to weaken or eliminate the effects of signal attenuation, propagation delay change, etc. caused by the distance between the UE to be accessed and the satellite base station.

[0078] In an optional embodiment, the distance influence data may include three-dimensional position information; accordingly, the position correction factor may be determined in the following manner: according to a preset correspondence table, searching for the position correction factor corresponding to the three-dimensional position information; wherein the preset correspondence table includes the correspondence between different reference distance influence data and reference position correction factors.

[0079] Among them, the preset correspondence table can be set or adjusted by the technician according to needs or experience, or determined through a large number of experiments, and this application does not impose any restrictions on this. It can be understood that by searching the data, the position correction factor corresponding to the three-dimensional position information of the UE to be connected is determined, which improves the convenience of the position correction factor determination process. In addition, the preset correspondence table is used as a carrier of the correspondence between different reference distances affecting the data and the reference position correction factor, which is convenient for storage and maintenance.

[0080] 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, etc. caused by environmental data related to transmission time.

[0081] In another optional embodiment, the distance impact data may include three-dimensional position information; accordingly, the TA correction factor may be determined in the following manner: based on the three-dimensional position information, determining the 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 signal propagation delay, the signal transmission speed and the first distance, determining the TA correction factor of the UE to be accessed.

[0082] Optionally, the difference between the three-dimensional position information of the UE to be accessed and the current position 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 position information of the UE to be accessed and the current position of the satellite base station to characterize the path loss or attenuation. The distance fading model can include at least one of a free space propagation model and a hyperbolic model, and the present application does not impose any limitation on this.

[0083] For example, the difference between the three-dimensional location information of the UE to be connected and the current location of the satellite base station can be determined, and the ratio between the difference and the signal transmission speed can be used as a signal propagation test. The signal transmission speed is usually the speed of light, that is, 3×10 8 m / s.

[0084] Exemplarily, the signal propagation delay, the signal transmission speed and the first distance can be used as input data and input into the TA correction factor determination function to obtain the TA correction factor of the UE to be connected. The TA correction factor determination function can be set or adjusted by a technician as needed, or repeatedly determined through a large number of experiments. This application does not impose any restrictions on the construction method and presentation form of the TA correction factor determination function.

[0085] Optionally, the TA correction factor determination function can perform 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 a reference TA correction factor; with a large number of reference signal propagation delays, reference signal transmission speeds and first reference distances as independent variables and the reference TA correction factor as the dependent variable, nonlinear fitting is performed to obtain the TA correction factor determination function for use.

[0086] Due to the satellite communication systems under different satellite types, the corresponding TA correction factor determination results are different. In order to eliminate the influence of satellite type on the TA correction factor determination result, TA correction factor determination functions can be constructed for different satellite types. Accordingly, when determining the TA correction factor, the TA correction factor determination function that matches the satellite type of the satellite base station can be first determined, and then the signal propagation delay, signal transmission speed and the first distance are used as input data and input into the selected TA correction factor determination function to obtain the TA correction factor of the UE to be accessed.

[0087] In an optional implementation, different TA correction factor determination functions correspond to different distance fading models. It is worth noting that different propagation models and characteristics will lead to changes in signal transmission speed, attenuation effect, etc. Taking these factors into full consideration in the construction or selection process of the TA correction factor determination function will help improve the accuracy of the final determined TA correction factor.

[0088] Specifically, the TA correction factor can be determined using the following formula:

[0089] parameter_factor_TA = f(distance_1, propagation_delay, signal_speed);

[0090] Among them, 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; signal_speed is the signal transmission speed.

[0091] 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, etc. caused by environmental data related to the transmission frequency.

[0092] In another optional embodiment, the distance impact data may include three-dimensional position information and three-dimensional map data at the location of the UE to be accessed; accordingly, the FA correction factor can be determined in the following manner: based on the three-dimensional map data and the three-dimensional position information, determine the second distance between the UE to be accessed and the surrounding environment targets of the UE to be accessed, as well as the target feature data corresponding to the surrounding environment targets; based on the target feature data and the second distance, determine the FA correction factor of the UE to be accessed.

[0093] The three-dimensional map data carries information such as buildings and terrain around the location of the UE to be accessed. Optionally, the three-dimensional map data may be environmental perception data collected by an environmental sensor set around the UE to be accessed; or optionally, the three-dimensional map data may be a pre-drawn three-dimensional map of the location of the UE to be accessed.

[0094] Exemplarily, the surrounding environment targets around the location of the UE to be connected can be determined based on the three-dimensional map data and the three-dimensional location information, which may include at least one of a building target and a terrain target. For example, based on a traditional target detection network, the environmental targets in the three-dimensional map data can be identified, and the environmental targets within a preset range of the location of the three-dimensional location information can be used as the surrounding environment targets of the UE to be connected.

[0095] Exemplarily, the second distance is determined according to the difference between the three-dimensional position information and the surrounding environment targets, and is used to characterize the spatial distance between the UE to be accessed and the surrounding environment targets.

[0096] Optionally, for each surrounding environment target, the difference between the three-dimensional position information and the surrounding environment target can be determined; and the statistical results of the differences corresponding to each surrounding environment target (such as the average value, maximum value, minimum value or median value, etc.) are used as the second distance.

[0097] In an optional implementation, based on a traditional feature extraction network, feature extraction is performed on surrounding environment targets in three-dimensional map data to obtain target feature data. Alternatively, the feature extraction results of surrounding environment targets output by the feature extraction subnetwork in the target detection network are directly used as target feature data. Among them, the target feature data may include at least one of the target height, target category and target profile of the surrounding environment targets, which is used to characterize the environmental characteristics of the environment in which the UE to be connected is currently located. It is worth noting that the target type can be further subdivided into subcategories under the building category and subcategories under the terrain category, etc.

[0098] In another optional implementation, the reflection and attenuation effects caused by each surrounding environment target can be measured based on the path loss model and the building reflection model, and the determined impact value can be used as the target feature data to characterize the impact of the surrounding environment targets on the signal transmission of the UE to be accessed.

[0099] Exemplarily, the target feature data and the second distance can be used as input data and input into the FA correction factor determination function to obtain the TA correction factor of the UE to be connected. The FA correction factor determination function can be set or adjusted by a technician as needed, or repeatedly determined through a large number of experiments. This application does not impose any restrictions on the construction method and presentation form of the FA correction factor determination function.

[0100] Optionally, the FA correction factor determination function can perform random access simulation based on reference target characteristic data and the second reference distance collected in a large number of experiments to obtain a reference FA correction factor; use a large number of reference target characteristic data and the second reference distance as independent variables and the reference FA correction factor as the dependent variable to perform nonlinear fitting to obtain the FA correction factor determination function for use.

[0101] Due to the satellite communication systems under different satellite types, the corresponding FA correction factor determination results are different. In order to eliminate the influence of satellite type on the FA correction factor determination result, FA correction factor determination functions can be constructed for different satellite types. Accordingly, when determining the FA correction factor, the FA correction factor determination function matching the satellite type of the satellite base station can be first determined, and then the target feature data and the second distance are used as input data and input into the selected TA correction factor determination function to obtain the TA correction factor of the UE to be connected.

[0102] In an optional implementation, the path loss models and building reflection models corresponding to different FA correction factor determination functions may be at least partially different. It is worth noting that different propagation models and characteristics may lead to different degrees of influence of signal reflection and attenuation. Taking the above factors into full consideration in the construction or selection process of the FA correction factor determination function will help improve the accuracy of the FA correction factor finally determined.

[0103] Specifically, the FA correction factor can be determined using the following formula:

[0104] parameter_factor_FA = g(distance_2, environment);

[0105] Among them, parameter_factor_FA is the FA correction factor; g( ) is the TA correction factor determination function; distance_2 is the second distance; environment is the target feature data.

[0106] It is worth noting that in the process of determining the TA correction factor and the FA correction factor, the dimensions taken into consideration include distance, propagation delay, and environmental characteristics-related data, which more comprehensively reflects the influencing factors in the actual scenario, thereby improving the accuracy of the correction factor determination results, and in turn helping to improve the accuracy of the subsequent time-frequency adjustment parameter correction results.

[0107] S220: Correct the time-frequency adjustment parameter according to the access correction factor.

[0108] Exemplarily, at least one correction factor may be used to correct at least one time-frequency adjustment parameter to obtain a corrected time-frequency adjustment parameter.

[0109] In an optional implementation, the TA in the time-frequency adjustment parameter may be corrected according to at least one of the position correction factor, the TA correction factor, and the FA correction factor to obtain a corrected TA.

[0110] In another optional implementation, the FA in the time-frequency adjustment parameter may be corrected according to at least one of a position correction factor, a TA correction factor, and a FA correction factor to obtain a corrected FA.

[0111] In the above optional implementation, by determining the access correction factor in at least one dimension according to the distance impact data, and correcting the time-frequency adjustment parameter based on the access correction factor in at least one dimension, the richness and diversity of the correction method are improved.

[0112] On the basis of the technical solutions of the above-mentioned embodiments, the present application further provides an optional embodiment. In this optional embodiment, the step of correcting the time-frequency adjustment parameters according to the access correction factor in S220 is refined.

[0113] See also Figure 3 The steps for correcting the time-frequency adjustment parameters shown include:

[0114] S310: Determine a difference between an expected access parameter and a time-frequency adjustment parameter.

[0115] The expected access parameter may be understood as a time-frequency adjustment parameter that is preset based on the communication requirements of a specific communication scenario, that is, a target value of the time-frequency adjustment parameter.

[0116] Exemplarily, when the time-frequency adjustment parameter includes TA, the expected access parameter may include expected TA; when the time-frequency adjustment parameter includes FA, the expected access parameter may include expected FA.

[0117] The difference between the expected access parameter and the time-frequency adjustment parameter is used to measure the gap between the time-frequency adjustment parameter at the current moment and the expected access parameter. It is worth noting that the difference here is a vector value, not a scalar value. The positive or negative value of the vector value directly affects the correction direction of the subsequent time-frequency adjustment parameter correction.

[0118] S320, determining adjustment parameter correction data according to the product of the difference and the access correction factor.

[0119] The adjustment parameter correction data is used to represent the numerical quantification result of the adjustment of the time-frequency adjustment parameter.

[0120] In an optional implementation, 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.

[0121] In another optional implementation, if the number of access correction factors is at least two, the cascade product of the above difference and each access correction factor may be used as adjustment parameter correction data.

[0122] 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 amplitude and the parameter correction direction.

[0123] S330, determining a corrected time-frequency adjustment parameter according to the sum of the time-frequency adjustment parameter and the adjustment parameter correction data.

[0124] Optionally, the sum of the time-frequency adjustment parameter and the adjustment parameter correction data may be directly used as the corrected time-frequency adjustment parameter.

[0125] Alternatively, the product between the parameter correction factor and the preset adjustment ratio can also be determined, and the sum of the product result and the time-frequency adjustment parameter is used as the corrected time-frequency adjustment parameter. Among them, the preset adjustment ratio can be set or adjusted by the technician according to needs or experience, or determined through a large number of experiments. It is worth noting that the preset adjustment ratios corresponding to different time-frequency adjustment parameters are the same or different, and this application does not impose any restrictions on this.

[0126] In an optional implementation, the following formula may be used to correct TA:

[0127] TA_adjusted = TA_current + K1 * (TA_desired - TA_current) * location_factor * parameter_factor_TA * parameter_factor_FA;

[0128] Among them, TA_adjusted is the corrected TA; TA_desired is the desired TA; TA_current is the TA before correction; location_factor is the location correction factor; parameter_factor_TA is the TA correction factor; parameter_factor_FA is the FA correction factor; K1 is the first preset adjustment ratio.

[0129] In another optional implementation, the following formula may be used to correct FA:

[0130] FA_adjusted = FA_current + K2 * (FA_desired - FA_current) * location_factor * parameter_factor_FA * parameter_factor_TA;

[0131] Among them, FA_adjusted is the corrected FA; FA_desired is the desired FA; FA_current is the FA before correction; location_factor is the location correction factor; parameter_factor_FA is the FA correction factor; parameter_factor_TA is the TA correction factor; K2 is the second preset adjustment ratio.

[0132] The above optional embodiment introduces the difference between the expected access parameter and the time-frequency adjustment parameter as the basis for determining the adjustment parameter correction data, and determines the adjustment parameter correction data according to the product of the difference and the access correction factor, and determines the corrected time-frequency adjustment parameter according to the sum of the time-frequency adjustment parameter and the adjustment parameter correction data. The above determination process can be achieved through simple calculations, the computing power cost invested is low, and the determination efficiency is high, which helps to improve the correction efficiency of the time-frequency adjustment parameter correction, without the need to expand the computing power of the existing satellite base station, and is more universal.

[0133] The technical solutions of the above embodiments take the satellite base station as the execution subject and describe the terminal access method in detail. The following will take the UE to be accessed as the execution subject and describe the terminal access method in detail.

[0134] See also Figure 4 The terminal access method shown is applied to a UE to be accessed, and includes:

[0135] S410: Send a random access request to a satellite base station, so that the satellite base station modifies a time-frequency adjustment parameter determined based on a preamble sequence in the random access request according to distance impact 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 be accessed when attempting to establish an uplink connection with the satellite base station, so as to ensure that the UE to be accessed can effectively access the network and obtain necessary resource allocation before data transmission.

[0138] The random access request may include a preamble sequence which is sent through a PRACH (Physical Random Access Channel) to identify an access attempt of a UE to be accessed and to help a satellite base station detect whether the access request comes from the UE to be accessed.

[0139] The distance impact data is used to characterize data that directly or indirectly affects the signal transmission distance, and may include at least one of the three-dimensional location information of the UE to be accessed and the three-dimensional map data at the location of the UE to be accessed. The three-dimensional location information is used to characterize the spatial location information of the UE to be accessed in three-dimensional space, which directly affects the signal transmission distance; the three-dimensional map data carries information such as building information and terrain information of the current environment of the UE to be accessed, which affects the signal transmission distance through multipath and obstruction.

[0140] Exemplarily, when the UE to be accessed has an access demand, a random access request is sent to the satellite base station; accordingly, the satellite base station receives the random access request, and determines the time-frequency adjustment parameters based on the leading sequence in the random access request, and corrects the time-frequency adjustment parameters according to the distance impact data of the UE to be accessed in the random access request. It is worth noting that the relevant steps for the satellite base station to determine and correct the time-frequency adjustment parameters can be referred to the relevant descriptions of the aforementioned embodiments, and no limitation is made here.

[0141] S420, receiving the corrected time-frequency adjustment parameters sent by the satellite base station.

[0142] S430, adjusting the uplink transmission parameters according to the corrected time-frequency adjustment parameters, and performing random access based on the adjusted uplink transmission parameters.

[0143] After the satellite base station corrects the time and frequency adjustment parameters, it will send 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] Optionally, the uplink transmission parameter may include an uplink transmission time; accordingly, the uplink transmission time may be adjusted according to the modified TA. Alternatively, the uplink transmission parameter may include an uplink transmission frequency; accordingly, the uplink transmission frequency may be adjusted according to the modified FA.

[0145] In an optional embodiment, in order to facilitate the UE to be accessed to understand the random access status of the satellite network, the satellite base station may also send access feedback information to the UE to be accessed after the UE to be accessed performs random access; accordingly, the UE to be accessed receives the access feedback information sent by the satellite base station; when the access feedback information indicates that the access is successful, the communication activity is carried out normally. Alternatively, when the access feedback information indicates that the access fails, the random access request sending operation is re-executed, so as to re-correct the time-frequency adjustment parameters.

[0146] It is understandable that in the event of access failure, the UE re-executes the random access request sending operation and corrects the TA and FA again until the access is successful, which can achieve more accurate TA and FA corrections, improve the accuracy of the correction results, and thus improve 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 the time-frequency adjustment parameters including TA and / or FA according to the leading sequence in the random access request, and corrects the time-frequency adjustment parameters according to the distance impact data of the UE to be accessed in the random access request. The corrected time-frequency adjustment parameters fully consider the impact of the distance impact data, thereby improving the accuracy of the correction result. Accordingly, the UE to be accessed adjusts the uplink transmission parameters based on the more accurate corrected time-frequency adjustment parameters, and performs random access based on the adjusted uplink transmission parameters, which can eliminate changes in signal attenuation and propagation delay caused by distance-related factors, thereby reducing the impact of factors such as atmosphere, multipath and occlusion, improving signal fading and interference, thereby improving the satellite network random access success rate, thereby improving satellite network performance and user perception, and reducing satellite network construction and optimization costs.

[0148] Based on the technical solutions of the above embodiments, the present application also provides an optional embodiment, in which the terminal access method is described in detail from the perspective of multi-party interaction.

[0149] See also Figure 5 The terminal access method shown includes:

[0150] S501, the UE sends a random access request to the satellite base station through the PRACH channel; wherein the random access request includes the UE's three-dimensional location information, the three-dimensional map data of the current environment, and a preamble sequence;

[0151] S502, the satellite base station performs correlation peak detection on the preamble sequence to obtain a current TA; and performs spectrum analysis and frequency feature extraction on the preamble sequence to obtain a current FA;

[0152] S503, the satellite base station determines a position correction factor according to the three-dimensional position information; and determines a TA correction factor and a FA correction factor according to the three-dimensional position information and the three-dimensional map data;

[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 via a 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 at the adjusted uplink sending time and uplink sending frequency, and completes the random access process;

[0157] S508, the satellite base station determines whether the UE has successfully accessed; if so, execute S509; otherwise, execute 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; and the process returns to S501.

[0160] It is worth noting that the above terminal access process is compatible with different networks and application scenarios, and can adapt to NTN transparent transmission mode and NTN regeneration mode, making it more universal, scalable and stable. In addition, by adjusting TA and FA, signal attenuation and propagation delay are eliminated, signal quality is improved, and the success rate of satellite network access is increased.

[0161] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0162] Based on the same inventive concept, the embodiment of the present application also provides a terminal access device for implementing the terminal access method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more terminal access device embodiments provided below can refer to the limitations on the terminal access method above, and will not be repeated here.

[0163] In one embodiment, Figure 6 As shown, a terminal access device is provided, which is configured in a satellite base station and includes: a first receiving module 610, a first determining module 620, a correcting module 630 and a first sending module 640. Among them:

[0164] The first receiving module 610 is configured to receive a random access request from a UE to be accessed; wherein the random access request includes a preamble sequence and distance impact data of the UE to be accessed;

[0165] A first determination module 620 is used to determine a time-frequency adjustment parameter according to the preamble sequence; the time-frequency adjustment parameter includes TA and / or FA;

[0166] A correction module 630, used to correct the time-frequency adjustment parameters according to the distance impact data;

[0167] The first sending module 640 is configured to send the modified time-frequency adjustment parameter to the UE to be accessed, so that the UE to be accessed performs random access according to the uplink transmission parameter adjusted based on the modified time-frequency adjustment parameter.

[0168] In one embodiment, the correction module 630 includes: a first determination unit, used to determine an access correction factor based on distance impact data; the access correction factor includes at least one of a position correction factor, a TA correction factor and a FA correction factor; and a correction unit, used to correct the time-frequency adjustment parameter based on the access correction factor.

[0169] In one of the embodiments, the distance influence data includes three-dimensional position information; the first determination unit includes: a search unit, used to search for a position correction factor corresponding to the three-dimensional position information according to a preset correspondence table; wherein the preset correspondence table includes a correspondence between different reference distance influence data and reference position correction factors.

[0170] In one of the embodiments, the distance impact data includes three-dimensional position information; the first determination unit includes: a first determination subunit, used to determine the 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 position information; a second determination subunit, used 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 one of the embodiments, the second determination subunit is specifically used to determine a TA correction factor determination function that matches the satellite type of the satellite base station; the signal propagation delay, the signal transmission speed and the first distance are used as input data, which are input into the TA correction factor determination function to obtain the TA correction factor of the UE to be accessed.

[0172] In one of the embodiments, the distance impact data includes three-dimensional position information and three-dimensional map data at the location of the UE to be accessed; the first determination unit includes: a first acquisition subunit, used to determine the second distance between the UE to be accessed and the surrounding environment targets of the UE to be accessed, and the target feature data corresponding to the surrounding environment targets based on the three-dimensional map data and the three-dimensional position information; a third determination subunit, used to determine the FA correction factor of the UE to be accessed based on the target feature data and the second distance.

[0173] In one of the embodiments, the third determination subunit is specifically used to determine a FA correction factor determination function that matches the satellite type of the satellite base station; the target feature data and the second distance are input as input data to the FA correction factor determination function to obtain the FA correction factor of the UE to be accessed.

[0174] In one embodiment, the correction unit includes: a fourth determination subunit, used to determine the difference between the expected access parameter and the time-frequency adjustment parameter; a fifth determination subunit, used to determine the adjustment parameter correction data based on the product of the difference and the access correction factor; and a sixth determination subunit, used 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 one of the embodiments, the apparatus further includes a feedback module, configured to send access feedback information to the UE to be accessed, so that the UE to be accessed re-executes the sending operation of the random access request when the access feedback information indicates that the access fails.

[0176] In another alternative embodiment, if Figure 7 As shown, a terminal access device is provided, which is configured on a UE to be accessed, and includes: a second sending module 710, a second receiving module 720 and an access module 730. Among them:

[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 modifies the time-frequency adjustment parameter determined based on the preamble sequence in the random access request according to the distance impact data of the UE to be accessed in the random access request; the time-frequency adjustment parameter includes 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] The access module 730 is configured to adjust the uplink transmission parameters according to the modified time-frequency adjustment parameters, and perform random access based on the adjusted uplink transmission parameters.

[0180] In one of the embodiments, the device further includes a third receiving module for receiving access feedback information sent by the satellite base station; the second sending module 710 is further used to re-execute the sending operation of the random access request when the access feedback information indicates that the access fails.

[0181] Each module in the above terminal access device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a communication device in the form of hardware, or can be stored in a memory in a communication device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0182] In one embodiment, a communication device is provided. The communication device may be a server, and its internal structure diagram may be as follows: Figure 8 As shown. The communication device includes a processor, a memory, a network interface and a transceiver connected through a system bus. Among them, the processor of the communication device is used to provide computing and control capabilities. The memory of the communication device includes a non-volatile storage medium and an internal memory. The transceiver of the communication device is used to perform operations of receiving data or sending data under the control of the processor. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the communication device is used to store data such as uplink text messages and downlink text messages. The network interface of the communication device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a terminal access method is implemented.

[0183] Those skilled in the art will understand that Figure 8The structure shown in the figure is only a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the communication device to which the scheme of the present application is applied. The specific communication device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0184] In one embodiment, a communication device is provided, including a memory and a processor, wherein a computer program is stored in the memory and the processor implements the steps of the terminal access method provided in each embodiment of the present application when executing the processing logic in the computer program.

[0185] In one embodiment, a computer-readable storage medium or a computer program product is provided, on which a computer program is stored. When the processing logic in the computer program is executed by a processor, the steps of the terminal access method provided in each embodiment of the present application are implemented.

[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, stored data, displayed data, 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 can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium 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), magnetoresistive 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0188] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A terminal access method, characterized in that: Applied to satellite base stations, including: Receiving a random access request from a user terminal UE to be accessed; wherein the random access request includes a preamble sequence and distance impact data of the UE to be accessed; Determine a time-frequency adjustment parameter according to the preamble sequence; the time-frequency adjustment parameter includes a time adjustment TA and / or a frequency adjustment FA; Modifying the time-frequency adjustment parameters according to the distance impact data; The modified time-frequency adjustment parameter is sent to the UE to be accessed, so that the UE to be accessed performs random access according to the uplink transmission parameter adjusted based on the modified time-frequency adjustment parameter.

2. The method according to claim 1, characterized in that The modifying the time-frequency adjustment parameter according to the distance impact data includes: Determine an access correction factor according to 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; The time-frequency adjustment parameter is modified according to the access correction factor.

3. The method according to claim 2, characterized in that The distance impact data includes three-dimensional position information; and determining the access correction factor according to the distance impact data includes: According to a preset correspondence table, searching for a 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, characterized in that: The distance impact data includes three-dimensional position information; and determining the access correction factor according to the distance impact data includes: Determine, according to the three-dimensional position information, a first distance between the UE to be accessed and the satellite base station, and a signal propagation delay of the UE to be accessed; Determine a TA correction factor of the UE to be accessed according to the signal propagation delay, the signal transmission speed and the first distance.

5. The method according to claim 4, characterized in that The determining, according to the signal propagation delay, the signal transmission speed, and the first distance, a TA correction factor of the UE to be accessed includes: Determine a TA correction factor determination function that matches the satellite type of the satellite base station; The signal propagation delay, the signal transmission speed and the first distance are used as input data and input into 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, characterized in that The distance impact data includes three-dimensional position information and three-dimensional map data at the location of the UE to be accessed; The determining of the access correction factor according to the distance impact data includes: Determine, according to the three-dimensional map data and the three-dimensional position information, a second distance between the UE to be accessed and a target in the surrounding environment of the UE to be accessed, and target feature data corresponding to the target in the surrounding environment; Determine the FA correction factor of the UE to be accessed according to the target feature data and the second distance.

7. The method according to claim 6, characterized in that Determining, according to the target characteristic data and the second distance, a FA correction factor of the UE to be accessed, includes: Determine a FA correction factor determination function that matches the satellite type of the satellite base station; The target characteristic data and the second distance are used as input data and input into 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 to 7, characterized in that: The modifying the time-frequency adjustment parameter according to the access modification factor includes: Determining a difference between an expected access parameter and the time-frequency adjustment parameter; Determining adjustment parameter correction data according to the product of the difference and the access correction factor; The corrected time-frequency adjustment parameter is determined according to the sum of the time-frequency adjustment parameter and the adjustment parameter correction data.

9. The method according to any one of claims 1 to 7, characterized in that: The method further comprises: Access feedback information is sent to the UE to be accessed, so that the UE to be accessed re-executes the sending operation of the random access request when the access feedback information indicates that the access fails.

10. A terminal access method, characterized in that: Applied to the UE to be connected, including: Sending a random access request to a satellite base station, so that the satellite base station modifies the time-frequency adjustment parameter determined based on the preamble sequence in the random access request according to the distance impact data of the UE to be accessed in the random access request; the time-frequency adjustment parameter includes TA and / or FA; Receiving the corrected time-frequency adjustment parameters sent by the satellite base station; The uplink transmission parameters are adjusted according to the modified time-frequency adjustment parameters, and random access is performed based on the adjusted uplink transmission parameters.

11. The method according to claim 10, characterized in that The method further comprises: receiving access feedback information sent by the satellite base station; When the access feedback information indicates that the access fails, the random access request sending operation is re-executed.

12. A terminal access device, characterized in that: Configured in the satellite base station, including: A 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 impact data of the UE to be accessed; A first determination module, configured to determine a time-frequency adjustment parameter according to the preamble sequence; the time-frequency adjustment parameter includes TA and / or FA; A correction module, used for correcting the time-frequency adjustment parameter according to the distance influence data; The first sending module is used to send the modified time-frequency adjustment parameter to the UE to be accessed, so that the UE to be accessed performs random access according to the uplink transmission parameter adjusted based on the modified time-frequency adjustment parameter.

13. A terminal access device, characterized in that: Configuration on the UE to be connected includes: A second sending module is used to send a random access request to a satellite base station, so that the satellite base station modifies the time-frequency adjustment parameter determined based on the preamble sequence in the random access request according to the distance impact data of the UE to be accessed in the random access request; the time-frequency adjustment parameter includes TA and / or FA; A second receiving module, used to receive the corrected time-frequency adjustment parameters sent by the satellite base station; The access module is used to adjust the uplink transmission parameters according to the modified time-frequency adjustment parameters, and 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, characterized in that: The transceiver is used to receive data or send data under the control of the processor, and the processor implements the steps of the method described in any one of claims 1 to 11 when executing the computer program.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 11 are implemented.

16. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method described in any one of claims 1 to 11 are implemented.

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