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

Abstract

The application relates to a terminal access method and device, communication equipment, medium and 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 a 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 preamble sequence; the time-frequency adjustment parameter comprises 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 an uplink transmission parameter adjusted based on the corrected time-frequency adjustment parameter. By adopting the technical scheme, the change of signal attenuation and propagation delay caused by distance-related factors can be eliminated, the influence of factors such as atmosphere, multipath and shielding can be reduced, the signal fading and interference conditions can be improved, and the random access success rate of the satellite network is improved.

Description

TECHNICAL FIELD

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

[0002] NTN (Non-Terrestrial Network, non-terrestrial network or non-terrestrial network) refers to a wireless communication network constructed by satellites, high-altitude airships or other celestial bodies without relying on ground facilities.

[0003] As an important component of NTN network, SN (Satellite Network) can form a broadband communication network coverage by using multiple satellites, which is suitable for countries and regions with wide area and few people, and can solve the communication demand in areas without base stations.

[0004] In the SN random access scenario, due to the long distance, large loss and large delay between the satellite and the UE (User Equipment), and the influence of factors such as atmosphere, multipath and shielding, it is difficult to adjust the time and frequency, which causes the signal quality to decrease and affects the success rate of random access. SUMMARY

[0005] Therefore, it is necessary to provide a terminal access method, device, communication device, medium and product to improve the success rate of random access of the terminal and improve the user communication experience of the satellite network.

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

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

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

[0009] Correcting the time-frequency adjustment parameter according to the distance influence data;

[0010] 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.

[0011] In one embodiment, correcting the time-frequency adjustment parameter according to the distance influence data includes: determining an access correction factor according to the distance influence 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 parameter according to the access correction factor.

[0012] In one of the embodiments, the distance impact data comprises three-dimensional position information; and determining the access correction factor according to the distance impact data comprises: searching for a position correction factor corresponding to the three-dimensional position information according to a preset correspondence table; wherein the preset correspondence table comprises a correspondence relationship between different reference distance impact data and reference position correction factors.

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

[0014] In one of the embodiments, determining the TA correction factor of the UE to be accessed according to the signal propagation time delay, the signal transmission speed and the first distance comprises: determining a TA correction factor determination function matched with a satellite type of the satellite base station; and inputting the signal propagation time 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 comprises three-dimensional position information and three-dimensional map data at a location of the UE to be accessed; and determining the access correction factor according to the distance impact data comprises: determining a second distance between the UE to be accessed and a surrounding environment target of the UE to be accessed and target feature data corresponding to the surrounding environment target according to the three-dimensional map data and the three-dimensional position information; and determining a FA correction factor of the UE to be accessed according to the target feature data and the second distance.

[0016] In one of the embodiments, determining the FA correction factor of the UE to be accessed according to the target feature data and the second distance comprises: determining a FA correction factor determination function matched with a 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.

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

[0018] In one of the embodiments, the method further comprises: 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 if the access feedback information indicates that the access fails.

[0019] In a second aspect, the application further provides a terminal access method applied to a UE to be accessed, comprising:

[0020] sending a random access request to a satellite base station, so that the satellite base station corrects a time-frequency adjustment parameter determined based on a preamble sequence in the random access request according to distance influence data of the UE to be accessed in the random access request; the time-frequency adjustment parameter comprises TA and / or FA;

[0021] receiving the corrected time-frequency adjustment parameter sent by the satellite base station;

[0022] adjusting an uplink transmission parameter according to the corrected time-frequency adjustment parameter, and performing random access based on the adjusted uplink transmission parameter.

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

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

[0025] a first receiving module configured to receive a random access request of a UE to be accessed; wherein the random access request comprises a preamble sequence and distance influence data of the UE to be accessed;

[0026] a first determining module configured to determine a time-frequency adjustment parameter according to the preamble sequence; the time-frequency adjustment parameter comprises TA and / or FA;

[0027] a correcting module configured to correct the time-frequency adjustment parameter according to the distance influence data;

[0028] a first sending module configured to send the corrected time-frequency adjustment parameter to the UE to be accessed, so that the UE to be accessed performs random access according to an adjusted uplink transmission parameter based on the corrected time-frequency adjustment parameter.

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

[0030] a second sending module configured to send a random access request to a satellite base station, so that the satellite base station corrects a time-frequency adjustment parameter determined based on a preamble sequence in the random access request according to distance influence data of the UE to be accessed in the random access request; the time-frequency adjustment parameter comprises TA and / or FA.

[0031] The second receiving module is configured to receive the modified time-frequency adjustment parameter sent by the satellite base station.

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

[0033] In a fifth aspect, the present application further provides a communication device, comprising a memory, a transceiver and a processor, the memory stores a computer program, the transceiver is configured 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 embodiment when executing the computer program.

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

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

[0036] The terminal access method, device, communication device, medium and product described above, by sending a random access request to the satellite base station by the UE to be accessed, the satellite base station determines the time-frequency adjustment parameter including TA and / or FA according to the preamble sequence in the random access request, and modifies the time-frequency adjustment parameter according to the distance influence data of the UE to be accessed in the random access request. Since the modified time-frequency adjustment parameter fully considers the influence of the distance influence data, the accuracy of the modification result is improved. Accordingly, the UE to be accessed adjusts the uplink transmission parameter based on the modified time-frequency adjustment parameter with higher accuracy, and performs random access based on the adjusted uplink transmission parameter, which can eliminate the changes in signal attenuation and propagation delay caused by distance-related factors, thereby reducing the influence of factors such as atmosphere, multipath and shielding, improving the signal fading and interference conditions, thereby improving the success rate of satellite network random access, and further improving the satellite network performance and user perception, and reducing the construction and optimization cost of satellite network. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1A The application scenario diagram of the terminal access method in one embodiment is shown in the figure;

[0038] Figure 1B The flowchart of the terminal access method in one embodiment is shown in the figure;

[0039] Figure 2A flowchart of the modification step of the time-frequency adjustment parameter in one embodiment;

[0040] Figure 3 A flowchart of the modification step of the time-frequency adjustment parameter in another embodiment;

[0041] Figure 4 A flowchart of the terminal access method in another embodiment;

[0042] Figure 5 A flowchart of the terminal access method in another embodiment;

[0043] Figure 6 A structural block diagram of the terminal access device in one embodiment;

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

[0045] Figure 8 An internal structural diagram of the communication device in one embodiment. DETAILED DESCRIPTION

[0046] In order to make the purposes, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with the 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] In order to facilitate understanding, first, some nouns involved in the present application are introduced.

[0048] NTN refers to a wireless communication network that does not rely on ground facilities, but uses satellites, high-altitude airships or other celestial bodies to build. The main functions of NTN include: providing wide-area coverage: NTN can cover areas that cannot be covered by ground, such as oceans, polar regions, deserts, high 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. Expand network capacity: NTN can be used as a supplement to ground wireless networks to share the communication load of ground networks and improve overall network capacity and performance. Seamless roaming: The global coverage capability of NTN can achieve seamless roaming of users worldwide without the need to change SIM cards in different countries or regions. Support special applications: Due to the global coverage capability and high-strength communication signals of NTN, it can be used to support communication needs in special applications such as aviation, marine and other fields.

[0049] SN is a network system that uses satellites as repeaters or satellite-based 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. Such networks can provide communication services in areas where ground infrastructure is incomplete or unavailable, 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 satellite-to-satellite communication.

[0050] TA (Timing Advance) refers to the adjustment of the transmission time of a mobile terminal in a mobile communication system to ensure clock synchronization between the mobile terminal and the base station. Due to the different distances between the mobile terminal and the base station, the delay of signal transmission is also different, so the TA mechanism is needed to adjust the transmission time of the mobile terminal to ensure that the signal can arrive at the base station at the correct time. The adjustment of TA is usually a small time adjustment in units of symbols to correct the transmission timing of the signal, thereby improving the reliability and efficiency of communication.

[0051] FA (Frequency Adjust) refers to the adjustment of the transmission frequency of a mobile terminal in a mobile communication system to address frequency offset and multipath propagation issues. The transmission of signals between the mobile terminal and the base station is affected by various factors, which can cause the frequency of the signal to shift, and frequency offset can affect the reception quality and communication performance of the signal. Therefore, the FA mechanism can make small adjustments to the transmission frequency of the mobile terminal to correct the frequency offset and improve the reception quality and communication performance of the signal.

[0052] Referring to Figure 1A The application scenario diagram of the terminal access method shown in the figure is for the scenario of satellite network random access in 5G+ network and 6G network, etc. Due to the long distance and large loss between satellite 10 and UE 20, the time delay is large, and it is easy to be affected by factors such as atmosphere, multipath and shielding, causing difficulty in time and frequency adjustment, and signal quality decline, resulting in low success rate of random access. The problem seriously affects the user experience of satellite network. Of course, the network involved in the present application is not limited to 5G+ network and 6G network, but can also be extended to other networks as needed.

[0053] Therefore, the application provides a method for correcting time-frequency adjustment parameters including TA and / or FA based on distance impact data of the UE to be accessed, so that the corrected time-frequency adjustment parameters fully consider the impact 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 performs uplink transmission parameter adjustment and random access based on the corrected time-frequency adjustment parameters with higher accuracy, thereby improving the success rate of random access of the satellite network.

[0054] In an optional embodiment, as shown in Figure 1B a terminal access method is provided, applied to a satellite base station, including:

[0055] S110, receiving a random access request of 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] The random access request is a message sent by the UE to be accessed when trying to establish an uplink connection with the satellite base station, to ensure that the UE to be accessed can effectively access the network and obtain necessary resource allocation before data transmission.

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

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

[0059] For example, 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 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] The time-frequency adjustment parameter can be a related parameter affecting the access of the UE to be accessed to the satellite base station, and can include at least one of TA and FA.

[0062] Optionally, the TA at the current time can be obtained by performing correlation peak detection on the preamble sequence; or optionally, the FA at the current time can be obtained by performing spectrum analysis on the preamble sequence.

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

[0064] S130, correcting the time-frequency adjustment parameter according to the distance influence data.

[0065] In an optional embodiment, a first correspondence relationship between different reference distance influence data and reference correction data of the corresponding time-frequency adjustment parameter can be constructed in advance; based on the first correspondence relationship, reference correction data of the time-frequency adjustment parameter corresponding to the distance influence data is searched, and the corresponding time-frequency adjustment parameter is corrected according to the search result.

[0066] In another optional embodiment, a second correspondence relationship between different reference distance influence data and correction results of the corresponding time-frequency adjustment parameter can be constructed in advance; based on the second correspondence relationship, the correction result of the time-frequency adjustment parameter corresponding to the distance influence data is directly searched.

[0067] In yet another optional embodiment, a first correction function with the distance influence data as the independent variable and the correction data of the time-frequency adjustment parameter as the dependent variable can also be constructed in advance; the distance influence data is input into the first correction function as input data 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 should be noted that the determination method and presentation form of the first correction function are not limited in the present application.

[0068] In still another optional embodiment, a second correction function with the distance influence data as the independent variable and the correction result of the time-frequency adjustment parameter as the dependent variable can also be constructed in advance; the distance influence data is input into the second correction function as input data to obtain the correction result corresponding to the time-frequency adjustment parameter. It should be noted that the determination method and presentation form of the second correction function are not limited in the present application.

[0069] S140, 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.

[0070] For example, the satellite base station sends the UE to be accessed the corrected time-frequency adjustment parameter; the UE to be accessed adjusts the uplink transmission parameter based on the corrected time-frequency adjustment parameter, and performs random access according to the adjusted uplink transmission parameter. Wherein, the uplink transmission parameter can 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 can 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 normally carries out communication activities in the case that the access feedback information indicates that the access is successful. Or alternatively, the satellite base station sends access reference information to the UE to be accessed, so that the UE to be accessed re-executes the sending operation of the random access request in the case that the access feedback information indicates that the access fails, thereby re-performing the correction of the time-frequency adjustment parameter.

[0072] The optional embodiment above corrects the time-frequency adjustment parameter based on the distance influence data in the random access request, and the corrected time-frequency adjustment parameter fully considers the influence of the distance influence data, thereby improving the accuracy of the correction result. Correspondingly, the UE to be accessed adjusts the uplink transmission parameter based on the corrected time-frequency adjustment parameter with higher accuracy, and performs random access based on the adjusted uplink transmission parameter, which can eliminate the changes of signal attenuation and propagation delay caused by distance-related factors, thereby reducing the influence of factors such as atmosphere, multipath and shielding, improving the signal fading and interference situation, thereby improving the success rate of random access of the satellite network, and further improving the performance and user perception of the satellite network, and reducing the construction and optimization cost of the satellite network.

[0073] On the basis of the technical solutions of the above embodiments, the present application further provides an optional embodiment, in which the correction step of the time-frequency adjustment parameter in S130 is refined.

[0074] Referring to Figure 2 The correction step of the time-frequency adjustment parameter includes:

[0075] S210, determining an access correction factor according to the distance influence data; the access correction factor includes at least one of a position 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] The position correction factor is a distance-related correction factor, which is used to weaken or eliminate the influence of signal attenuation, propagation time delay variation, 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 can include three-dimensional position information; correspondingly, the position correction factor can be determined in the following manner: according to a preset correspondence table, the position correction factor corresponding to the three-dimensional position information is found; wherein the preset correspondence table includes the correspondence between different reference distance influence data and reference position correction factors.

[0079] The preset correspondence table can be set or adjusted by the technician according to the need or experience, or determined through a large number of experiments, and the present application does not make any limitation on this. It can be understood that by means of data searching, the determination of the position correction factor corresponding to the three-dimensional position information of the UE to be accessed is improved, which improves the convenience of the position correction factor determination process. In addition, the preset correspondence table as a carrier of the correspondence between different reference distance influence data and reference position correction factors is convenient for storage and maintenance.

[0080] The TA correction factor is a time adjustment-related correction factor, which is used to weaken or eliminate the influence of signal attenuation, propagation time delay variation, etc. caused by the transmission time-related environmental data.

[0081] In another optional embodiment, the distance influence data can include three-dimensional position information; correspondingly, the TA correction factor can be determined in the following manner: according to the three-dimensional position information, the first distance between the UE to be accessed and the satellite base station, and the signal propagation time delay of the UE to be accessed are determined; according to the signal propagation time delay, the signal transmission speed and the first distance, the TA correction factor of the UE to be accessed is determined.

[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 taken as the first distance between the UE to be accessed and the satellite base station, which is used to represent the spatial distance. Alternatively, based on the distance fading model, 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 to determine the first distance between the UE to be accessed and the satellite base station, which is used to represent the path loss or attenuation. The distance fading model can include at least one of the free space propagation model and the hyperbolic model, and the present application does not make any limitation on this.

[0083] For example, 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 determined, and the ratio between the difference and the signal transmission speed can be taken as the signal propagation time delay. The signal transmission speed is usually the speed of light, i.e. 3x10 8 m / s.

[0084] Exemplarily, the signal propagation delay, the signal transmission speed and the first distance can be taken as input data and input into the TA correction factor determination function to obtain the TA correction factor of the UE to be accessed. The TA correction factor determination function can be set or adjusted by the technician according to the need, or repeatedly determined through a large number of experiments, and the construction mode and presentation form of the TA correction factor determination function are not limited in the present application.

[0085] Optionally, the TA correction factor determination function can perform random access simulation according to the reference signal propagation delay, the reference signal transmission speed and the first reference distance collected in a large number of experiments to obtain a reference TA correction factor; and perform nonlinear fitting with the reference signal propagation delay, the reference signal transmission speed and the first reference distance as independent variables and the reference TA correction factor as dependent variable to obtain the TA correction factor determination function for use.

[0086] Since the satellite communication systems under different satellite types have certain differences in the corresponding TA correction factor determination results. In order to eliminate the influence of satellite type on the TA correction factor determination result, the TA correction factor determination function can be constructed for different satellite types respectively. Correspondingly, when determining the TA correction factor, the TA correction factor determination function matched with the satellite type of the satellite base station can be determined first, and then the signal propagation delay, the signal transmission speed and the first distance are taken 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, the distance fading models corresponding to different TA correction factor determination functions are different. It is worth noting that different propagation models and characteristics will lead to changes in signal transmission speed, attenuation effect and the like. Fully considering the above factors in the construction or selection process of the TA correction factor determination function helps to improve the accuracy of the finally determined TA correction factor.

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

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

[0090] Wherein, 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] Wherein, the FA correction factor is a correction factor related to frequency adjustment, used to weaken or eliminate the influence of signal attenuation, propagation time delay change and the like caused by the environmental data related to the transmission frequency.

[0092] In yet another optional embodiment, the distance influence data can include three-dimensional position information and three-dimensional map data of the location where the UE to be accessed is located; and the FA correction factor can be determined in the following manner: according to 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 around the UE to be accessed, and target feature data corresponding to the surrounding environment targets; and according to the target feature data and the second distance, determining the FA correction factor of the UE to be accessed.

[0093] Wherein, the three-dimensional map data carries information of buildings and terrain around the location where the UE to be accessed is located. Optionally, the three-dimensional map data can be environmental perception data collected by an environmental perception device arranged around the UE to be accessed; or alternatively, the three-dimensional map data can be a three-dimensional map of the location where the UE to be accessed is located, which is drawn in advance.

[0094] Illustratively, according to the three-dimensional map data and the three-dimensional position information, the surrounding environment targets around the location where the UE to be accessed is located can be determined, which can 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 where the three-dimensional position information is located can be taken as the surrounding environment targets of the UE to be accessed.

[0095] Illustratively, according to the difference between the three-dimensional position information and the surrounding environment targets, the second distance is determined, which is used to represent 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 result (such as the average value, the maximum value, the minimum value or the intermediate value, etc.) of the differences corresponding to the surrounding environment targets can be taken as the second distance.

[0097] In an optional implementation, based on a traditional feature extraction network, the surrounding environment targets in the three-dimensional map data are subjected to feature extraction to obtain the target feature data. Alternatively, the feature extraction result of the surrounding environment targets output by a feature extraction sub-network in the target detection network can be directly taken as the target feature data. Wherein, the target feature data can include at least one of a target height, a target category and a target contour of the surrounding environment targets, which are used to represent the self-environment characteristics of the current environment where the UE to be accessed is 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 brought by the surrounding environment target can also be measured based on a path loss model and a building reflection model, and the determined effect value is taken as the target feature data for representing the influence of the surrounding environment target on the signal transmission of the UE to be accessed.

[0099] For example, the target feature data and the second distance can be taken as input data to the FA correction factor determination function to obtain the TA correction factor of the UE to be accessed. The FA correction factor determination function can be set or adjusted by a technician according to needs, or repeatedly determined through a large number of experiments, and the construction method and presentation form of the FA correction factor determination function are not limited in the present application.

[0100] Optionally, the FA correction factor determination function can be simulated according to the reference target feature data and the second reference distance collected in a large number of experiments to obtain a reference FA correction factor; and the reference FA correction factor is taken as the dependent variable with the large number of reference target feature data and the second reference distance as the independent variable to perform nonlinear fitting to obtain the FA correction factor determination function for use.

[0101] Since the satellite communication systems under different satellite types have certain differences in the corresponding FA correction factor determination results. In order to eliminate the influence of satellite type on the FA correction factor determination result, the FA correction factor determination function can be constructed for different satellite types respectively. Correspondingly, when determining the FA correction factor, the FA correction factor determination function matched with the satellite type of the satellite base station can be determined first, and then the target feature data and the second distance are taken as input data to the selected TA correction factor determination function to obtain the TA correction factor of the UE to be accessed.

[0102] In an optional implementation, the path loss model and the 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 will result in different degrees of signal reflection and attenuation effects. Fully considering the above factors in the construction or selection process of the FA correction factor determination function can help to improve the accuracy of the finally determined FA correction factor.

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

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

[0105] Wherein, the 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.

[0106] It is worth noting that in the process of determining the TA correction factor and the FA correction factor, the dimensions considered include distance, propagation delay, and environment characteristic data, which more comprehensively reflect the influencing factors in the actual scene, thereby improving the accuracy of the correction factor determination result, and further helping to improve the accuracy of the subsequent time-frequency adjustment parameter correction result.

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

[0108] For example, at least one correction factor can 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 can 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 can 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 FA.

[0111] In the above optional implementation, the access correction factor in at least one dimension is determined according to the distance influence data, and the time-frequency adjustment parameter is corrected based on the access correction factor in at least one dimension, thereby improving the richness and diversity of the correction method.

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

[0113] Referring to the correction step of the time-frequency adjustment parameter shown in Figure 3 comprises:

[0114] S310, determining the difference between the expected access parameter and the time-frequency adjustment parameter.

[0115] The expected access parameter can be understood as a time-frequency adjustment parameter that is pre-set based on the communication demand of a specific communication scenario, i.e., the target value of the time-frequency adjustment parameter.

[0116] For example, in the case that the time-frequency adjustment parameter comprises TA, the expected access parameter can comprise an expected TA; in the case that the time-frequency adjustment parameter comprises FA, the expected access parameter can comprise an expected FA.

[0117] The difference between the expected access parameter and the time-frequency adjustment parameter is used to measure the difference 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 of the vector value directly affects the correction adjustment 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 quantization result of the adjustment of the time-frequency adjustment parameter.

[0120] In an optional implementation, if the number of access correction factors is one, 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 concatenated product of the above difference and each access correction factor can be used as the 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 the 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 can be directly used as the corrected time-frequency adjustment parameter.

[0125] Or optionally, the product of 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. The preset adjustment ratio can be set or adjusted by the technician according to the need 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, which is not limited by the present application.

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

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

[0128] Wherein, TA_adjusted is the adjusted TA; TA_desired is the desired TA; TA_current is the unadjusted TA; 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 can be used to correct the FA:

[0130] 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 unadjusted FA; 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 embodiments introduce the difference between the desired access parameter and the time-frequency adjustment parameter as the basis for determining the adjustment parameter correction data, and determine the adjustment parameter correction data according to the product of the difference and the access correction factor, and determine the adjusted 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 realized by simple operation, the cost of algorithm 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 algorithm 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 the terminal access method is described in detail. The following will take the UE to be accessed as the execution subject, and the terminal access method will be described in detail.

[0134] Referring toFigure 4 The terminal access method shown is applied to a UE to be accessed, and includes the following steps.

[0135] In S410, a random access request is sent to a satellite base station, so that the satellite base station corrects a time-frequency adjustment parameter determined based on a preamble sequence in the random access request, according to distance influence data of the UE to be accessed in the random access request.

[0136] The time-frequency adjustment parameter includes TA and / or FA.

[0137] The random access request is a message sent by the UE to be accessed when it attempts to establish an uplink connection with the satellite base station, to ensure that the UE to be accessed can effectively access the network and obtain necessary resource allocation before data transmission.

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

[0139] The distance influence data is used to represent data that directly or indirectly affects the signal transmission distance, and can include at least one of three-dimensional position information of the UE to be accessed and three-dimensional map data at the location of the UE to be accessed. The three-dimensional position information is used to represent the spatial position 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 environment where the UE to be accessed is currently located, which affects the signal transmission distance through multipath and blocking, etc.

[0140] For example, 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 and corrects the time-frequency adjustment parameter 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. It is worth noting that the steps of determining and correcting the time-frequency adjustment parameter by the satellite base station can refer to the related descriptions of the foregoing embodiments, and are not limited here.

[0141] In S420, the corrected time-frequency adjustment parameter sent by the satellite base station is received.

[0142] In S430, the uplink transmission parameter is adjusted according to the corrected time-frequency adjustment parameter, and random access is performed based on the adjusted uplink transmission parameter.

[0143] After the satellite base station corrects the time-frequency adjustment parameter, the satellite base station sends the corrected time-frequency adjustment parameter to the UE to be accessed through a downlink channel. The UE to be accessed receives the corrected time-frequency adjustment parameter and adjusts the uplink transmission parameter based on the corrected time-frequency adjustment parameter. The UE to be accessed sends uplink information to the satellite base station according to the adjusted uplink transmission parameter, and completes the subsequent operation of random access.

[0144] Optionally, the uplink transmission parameter can include an uplink sending time. Correspondingly, the uplink sending time can be adjusted according to the corrected TA. Alternatively, the uplink transmission parameter can include an uplink sending frequency. Correspondingly, the uplink sending frequency can be adjusted according to the corrected FA.

[0145] 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 can also send access feedback information to the UE to be accessed after the UE to be accessed performs random access. Correspondingly, the UE to be accessed receives the access feedback information sent by the satellite base station. In the case that the access feedback information indicates that the access is successful, the UE to be accessed normally carries out communication activities. Alternatively, in the case that the access feedback information indicates that the access fails, the UE to be accessed re-executes the sending operation of the random access request, so as to re-correct the time-frequency adjustment parameter.

[0146] It can be understood that in the case of access failure, the UE re-executes the sending operation of the random access request and re-corrects the TA and the FA until the access is successful, which can realize more accurate correction of the TA and the FA, improve the accuracy of the correction result, and thus improve the system performance and stability.

[0147] The above optional embodiment sends the random access request to the satellite base station by the UE to be accessed. The satellite base station determines the time-frequency adjustment parameter including the TA and / or the FA according to the preamble sequence in the random access request, and corrects the time-frequency adjustment parameter according to the distance influence data of the UE to be accessed in the random access request. Since the corrected time-frequency adjustment parameter fully considers the influence of the distance influence data, the accuracy of the correction result is improved. Correspondingly, the UE to be accessed adjusts the uplink transmission parameter based on the corrected time-frequency adjustment parameter with higher accuracy, and performs random access based on the adjusted uplink transmission parameter, which can eliminate the changes of signal attenuation and propagation delay caused by distance-related factors, so as to reduce the influence of factors such as atmosphere, multipath and shielding, improve the signal fading and interference situation, and thus improve the success rate of random access of the satellite network, and further improve the performance and user perception of the satellite network, and reduce the construction and optimization cost of the satellite network.

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

[0149] Referring to Figure 5 The terminal access method shown comprises:

[0150] S501, the UE sends a random access request to the satellite base station through a PRACH channel; wherein the random access request comprises three-dimensional position information of the UE, 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 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 a position correction factor according to the three-dimensional position information, and determines a TA correction factor and an FA correction factor according to the three-dimensional position information and the three-dimensional map data, respectively;

[0153] S504, the satellite base station corrects the current TA according to a TA correction formula, and corrects the current FA according to an FA correction formula;

[0154] S505, the satellite base station sends the corrected TA and the corrected FA to the UE through 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 transmission time and uplink transmission frequency, and completes the random access process;

[0157] S508, the satellite base station judges whether the UE is successfully accessed; if yes, S509 is executed; otherwise, S510 is executed;

[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 returns to execute S501.

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

[0161] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts involved in the above embodiments can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of the steps or stages is not necessarily sequential, but can be alternately or alternately executed with at least part of other steps or steps or stages in other steps.

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

[0163] In one embodiment, as shown in Figure 6 A terminal access device is provided, configured in a satellite base station, comprising: a first receiving module 610, a first determining module 620, a correction module 630, and a first sending module 640. Wherein:

[0164] The first receiving module 610 is configured to receive a random access request of a 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 configured to determine a time-frequency adjustment parameter according to the preamble sequence; the time-frequency adjustment parameter includes TA and / or FA;

[0166] The correction module 630 is configured to correct the time-frequency adjustment parameter according to the distance influence data;

[0167] The first sending module 640 is configured to send 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 adjusted uplink transmission parameter based on the corrected time-frequency adjustment parameter.

[0168] In one embodiment, the correction module 630 includes: a first determining unit configured to determine an access correction factor according to the distance influence 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 configured to correct the time-frequency adjustment parameter according to the access correction factor.

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

[0170] In one of the embodiments, the distance influence data comprises three-dimensional position information; the first determining unit comprises: a first determining sub-unit configured to determine a first distance between the UE to be accessed and the satellite base station and a signal propagation time delay of the UE to be accessed according to the three-dimensional position information; and a second determining sub-unit configured to determine a TA correction factor of the UE to be accessed according to the signal propagation time delay, a signal transmission speed and the first distance.

[0171] In one of the embodiments, the second determining sub-unit is specifically configured to determine a TA correction factor determination function matched with the satellite type of the satellite base station; and input the signal propagation time 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.

[0172] In one of the embodiments, the distance influence data comprises three-dimensional position information and three-dimensional map data at the location of the UE to be accessed; the first determining unit comprises: a first obtaining sub-unit configured to determine a second distance between the UE to be accessed and a surrounding environment target of the UE to be accessed and target feature data corresponding to the surrounding environment target according to the three-dimensional map data and the three-dimensional position information; and a third determining sub-unit configured to determine a FA correction factor of the UE to be accessed according to the target feature data and the second distance.

[0173] In one of the embodiments, the third determining sub-unit is specifically configured to determine a FA correction factor determination function matched with the satellite type of the satellite base station; and 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 one of the embodiments, the correction unit comprises: a fourth determining sub-unit configured to determine a difference between the expected access parameter and the time-frequency adjustment parameter; a fifth determining sub-unit configured to determine adjustment parameter correction data according to a product of the difference and the access correction factor; and a sixth determining sub-unit configured to determine the corrected time-frequency adjustment parameter according to a sum of the time-frequency adjustment parameter and the adjustment parameter correction data.

[0175] In one of the embodiments, the device further comprises 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 in the case that the access feedback information indicates that the access fails.

[0176] In another optional embodiment, as shown in Figure 7 A terminal access apparatus is provided, configured to be applied to a UE to be accessed, comprising a second sending module 710, a second receiving module 720 and an access module 730. Wherein:

[0177] The second sending module 710 is configured to send a random access request to a satellite base station, so that the satellite base station corrects 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; the time-frequency adjustment parameter comprises TA and / or FA;

[0178] The second receiving module 720 is configured to receive the corrected time-frequency adjustment parameter sent by the satellite base station;

[0179] The access module 730 is configured to adjust an uplink transmission parameter according to the corrected time-frequency adjustment parameter, and perform random access based on the adjusted uplink transmission parameter.

[0180] In one of the embodiments, the apparatus further comprises a third receiving module configured to receive access feedback information sent by the satellite base station; and the second sending module 710 is further configured to re-perform the sending operation of the random access request in the case that the access feedback information indicates that the access fails.

[0181] The above-mentioned modules in the terminal access apparatus can be realized by software, hardware and combination thereof in whole or in part. The above-mentioned modules can be embedded in or independent of the processor in the communication device in hardware form, or can be stored in the memory in the communication device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned modules.

[0182] In one embodiment, a communication device is provided, which can be a server, and the internal structure diagram thereof can be as shown in Figure 8 The communication device comprises a processor, a memory, a network interface and a transceiver connected through a system bus. Wherein, the processor of the communication device is configured to provide computing and control capabilities. The memory of the communication device comprises a non-volatile storage medium and an internal memory. The transceiver of the communication device is configured to perform the operation 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 operating system and the computer program in the non-volatile storage medium to run. The database of the communication device is configured to store data such as uplink short messages and downlink short messages. The network interface of the communication device is configured to communicate with the external terminal through the network connection. The computer program is executed by the processor to implement a terminal access method.

[0183] Those skilled in the art can understand, Figure 8The structure shown in the figure is only a block diagram of part of the 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 can 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, comprising a memory and a processor, the memory storing a computer program, and the processor executing processing logic in the computer program to implement the steps of the terminal access method provided by the embodiments of the present application.

[0185] In one embodiment, a computer readable storage medium or computer program product is provided, which stores a computer program, and the processing logic in the computer program is executed by a processor to implement the steps of the terminal access method provided by the embodiments of the present 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 for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties.

[0187] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0188] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0189] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A terminal access method, characterized by, The application is applied to a satellite base station, comprising: receiving a random access request of a user terminal (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 preamble sequence; the time-frequency adjustment parameter comprises a time adjustment (TA) and / or a frequency adjustment (FA); determining an access correction factor according to the distance influence data; the access correction factor comprises at least one of a location correction factor, a TA correction factor and a FA correction factor; correcting the time-frequency adjustment parameter according to the access correction factor; 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 an uplink transmission parameter adjusted based on the corrected time-frequency adjustment parameter.

2. The method of claim 1, wherein, The distance influence data comprises three-dimensional position information; the determination of the access correction factor according to the distance influence data comprises: looking up a location correction factor corresponding to the three-dimensional position information according to a preset correspondence table; wherein the preset correspondence table comprises a correspondence between different reference distance influence data and reference location correction factors.

3. The method of claim 1, wherein, The distance influence data comprises three-dimensional position information; the determination of the access correction factor according to the distance influence data comprises: determining a first distance between the UE to be accessed and the satellite base station according to the three-dimensional position information, and a signal propagation time delay of the UE to be accessed; determining a TA correction factor of the UE to be accessed according to the signal propagation time delay, a signal transmission speed and the first distance.

4. The method of claim 3, wherein, The determination of the TA correction factor of the UE to be accessed according to the signal propagation time delay, the signal transmission speed and the first distance comprises: determining a TA correction factor determination function matched with a satellite type of the satellite base station; inputting the signal propagation time 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.

5. The method of claim 1, wherein, The distance influence data comprises three-dimensional position information and three-dimensional map data at a location of the UE to be accessed; The determination of the access correction factor according to the distance influence data comprises: determining a second distance between the UE to be accessed and a surrounding environment target of the UE to be accessed and target feature data corresponding to the surrounding environment target according to the three-dimensional map data and the three-dimensional position information; determining a FA correction factor of the UE to be accessed according to the target feature data and the second distance.

6. The method of claim 5, wherein, The determination of the FA correction factor of the UE to be accessed according to the target feature data and the second distance comprises: determining a FA correction factor determination function matched with a satellite type of the satellite base station; 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.

7. The method according to any one of claims 1 to 6, characterized in that, The correction of the time-frequency adjustment parameter according to the access correction factor comprises: determining a difference between an expected access parameter and the time-frequency adjustment parameter; determining adjustment parameter correction data according to a product of the difference and the access correction factor; determining a corrected time-frequency adjustment parameter according to a sum of the time-frequency adjustment parameter and the adjustment parameter correction data.

8. The method according to any one of claims 1 to 6, characterized in that, The method further comprises: 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 in a case where the access feedback information indicates access failure.

9. A terminal access method, characterized by, Applied to a UE to be accessed, comprising: sending a random access request to a satellite base station, so that the satellite base station corrects a time-frequency adjustment parameter determined based on a preamble sequence in the random access request according to an access correction factor determined according to distance influence data of the UE to be accessed; the access correction factor comprises at least one of a position correction factor, a TA correction factor and a FA correction factor; the time-frequency adjustment parameter comprises TA and / or FA; receiving the corrected time-frequency adjustment parameter sent by the satellite base station; adjusting uplink transmission parameters according to the corrected time-frequency adjustment parameter, and performing random access based on the adjusted uplink transmission parameters.

10. The method of claim 9, wherein, The method further comprises: receiving access feedback information sent by the satellite base station; re-executing the sending operation of the random access request in a case where the access feedback information indicates access failure.

11. A terminal access device, characterized by Configured in a satellite base station, comprising: a first receiving module for receiving a random access request of a UE to be accessed; wherein the random access request comprises a preamble sequence and distance influence data of the UE to be accessed; a first determining module for determining a time-frequency adjustment parameter according to the preamble sequence; the time-frequency adjustment parameter comprises TA and / or FA; a correction module for determining an access correction factor according to the distance influence data; the access correction factor comprises at least one of a position correction factor, a TA correction factor and a FA correction factor; and correcting the time-frequency adjustment parameter according to the access correction factor; a first sending module for 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 uplink transmission parameters adjusted based on the corrected time-frequency adjustment parameter.

12. A terminal access device, characterized by Configured in a UE to be accessed, comprising: a second sending module for sending a random access request to a satellite base station, so that the satellite base station corrects a time-frequency adjustment parameter determined based on a preamble sequence in the random access request according to an access correction factor determined according to distance influence data of the UE to be accessed; the access correction factor comprises at least one of a position correction factor, a TA correction factor and a FA correction factor; the time-frequency adjustment parameter comprises TA and / or FA; a second receiving module for receiving the corrected time-frequency adjustment parameter sent by the satellite base station; an access module for adjusting uplink transmission parameters according to the corrected time-frequency adjustment parameter, and performing random access based on the adjusted uplink transmission parameters.

13. A communication device comprising a memory, a transceiver and a processor, the memory storing a computer program, characterized in that, The transceiver is configured to receive data or transmit data under control of the processor, which implements the steps of the method of any of claims 1-10 when executing the computer program.

14. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program, which implements the steps of the method of any of claims 1-10 when executed by a processor.

15. A computer program product comprising a computer program, characterized in that, The computer program, which implements the steps of the method of any of claims 1-10 when executed by a processor.

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