Switching method and device without random access process, base station and storage medium

Abstract

The invention discloses a switching method and device without a random access process, a base station and a storage medium, and belongs to the technical field of wireless communication, the method comprises the following steps: receiving a switching request sent by a source station, the switching request comprising first spatial position information of a to-be-accessed terminal relative to a target station, and according to recorded second spatial position information of each successfully switched reference terminal relative to the target station, determining whether the to-be-accessed terminal satisfies an RACH-LESS switching condition, if the to-be-accessed terminal satisfies the RACH-LESS switching condition, sending RACH-LESS switching request confirmation information to the source station based on the switching configuration information of the reference terminal, and if the to-be-accessed terminal satisfies the RACH-LESS switching condition, sending the RACH-LESS switching request confirmation information to the source station. The to-be-accessed terminal executes a non-random switching process at the target station based on the received RRC reconfiguration connection request message sent by the source station, and the RRC reconfiguration connection request message carries switching configuration information. According to the invention, the switching time delay and the RACH resource overhead can be reduced, and the RACH-LESS switching success rate can be improved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a handover method, device, base station and storage medium without a random access process. Background Art

[0002] During the handover process in a wireless communication system, the user equipment (UE) typically switches between the source and target stations through a random access channel (RACH). After receiving the handover command from the source station, the UE needs to send a preamble to the target station. The target station then responds with a random access response (RAR). The RAR contains information such as the UE's uplink timing advance (TA) and uplink grant (UL-Grant) for the target station. Based on this information, the UE can send a radio resource control (RRC) reconfiguration completion message to the target station to complete the handover. The handover delay generated during this handover process has a significant impact on both service quality and system network performance. Furthermore, in non-terrestrial networks (NTNs), the movement of satellites can trigger batch handovers for UEs within the source station, which also leads to limited RACH resources.

[0003] The 3rd Generation Partnership Project (3GPP) proposed a RACH-LESS (Random Access Channel-less) handover method to reduce handover latency and RACH resource overhead. However, this scenario has high requirements, such as requiring the source and target stations to have the same TA, resulting in a low handover success rate. Summary of the Invention

[0004] The embodiments of the present application provide a handover method, apparatus, base station, and storage medium without a random access process, to reduce handover delay and RACH resource overhead, and improve the RACH-LESS access success rate.

[0005] In a first aspect, an embodiment of the present application provides a handover method without a random access process, including:

[0006] Receiving a handover request sent by a source station, wherein the handover request includes first spatial position information of the terminal to be accessed relative to the target station;

[0007] Determining whether the terminal to be accessed meets a RACH-LESS handover condition without a random handover process based on the second spatial position information of each successfully handed-over reference terminal relative to the target station;

[0008] If the RACH-LESS switching condition is met, RACH-LESS switching request confirmation information is sent to the source station based on the switching configuration information of the reference terminal, so that the terminal to be accessed performs the RACH-LESS switching process at the target station based on the received radio resource control RRC reconfiguration connection request message sent by the source station, wherein the RRC reconfiguration connection request message carries the switching configuration information.

[0009] In some embodiments, determining whether the terminal to be accessed satisfies a RACH-LESS handover condition without a random handover process based on the second spatial position information of each successfully handed-over reference terminal relative to the target station includes:

[0010] Matching the first spatial location information with second spatial location information of at least one reference terminal that has successfully switched;

[0011] If the first spatial information successfully matches the second spatial location information of any reference terminal that has successfully switched, it is determined that the terminal to be accessed meets the RACH-LESS switching condition.

[0012] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance, a pitch angle, and a direction angle.

[0013] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance range, a pitch angle range, and a direction angle range, wherein:

[0014] The distance range is associated with the distance of the terminal relative to the target station and a preset distance step;

[0015] The pitch angle range is associated with the pitch angle of the terminal relative to the target station and a preset pitch angle step size;

[0016] The azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step size;

[0017] The terminal is a terminal to be accessed or a reference terminal.

[0018] In some embodiments, the switching configuration information of the reference terminal includes uplink grant UL-Grant, uplink transmit power and uplink timing advance TA.

[0019] In some embodiments, the handover request also includes third spatial location information of the terminal to be accessed relative to the source station, and before sending the RACH-LESS handover request confirmation information to the source station, the method further includes:

[0020] Determining a distance of the terminal to be accessed relative to the source station based on third spatial position information of the terminal to be accessed relative to the source station;

[0021] Determining a first time from the terminal to be accessed to the source station based on the distance of the terminal to be accessed relative to the source station and the speed of light; and

[0022] Determining a second time from the terminal to be accessed to the target station based on the distance between the terminal to be accessed and the target station and the speed of light;

[0023] The TA of the terminal to be accessed at the target station is determined based on the time difference between the first time and the second time, and the TA of the terminal to be accessed at the source station.

[0024] In some embodiments, sending RACH-LESS handover request confirmation information to the source station includes:

[0025] Based on the TA of the terminal to be accessed at the target station, a RACH-LESS handover request confirmation message is sent to the source station, where the handover request confirmation message carries the TA.

[0026] In some embodiments, further comprising:

[0027] If the RACH-LESS switching condition is not met, random access process RACH switching request confirmation information is sent to the source station.

[0028] In some embodiments, after sending the random access process RACH handover request confirmation information / RACH-LESS handover request confirmation information to the source station, the method further includes:

[0029] If a radio resource control (RRC) reconfiguration completion message sent by the access terminal is received within a preset time, it is determined that the access terminal is successfully switched;

[0030] Record the handover configuration information of the successful handover of the terminal to be accessed and the first spatial location information of the terminal to be accessed.

[0031] In some embodiments, each reference terminal adjusts the switching configuration information of the reference terminal according to the corresponding terminal type, wherein the terminal type includes a common terminal and a dedicated terminal.

[0032] In a second aspect, an embodiment of the present application provides a handover method without a random access process, including:

[0033] Receiving a radio resource control (RRC) reconfiguration connection request message sent by a source station, wherein the RRC reconfiguration connection request message carries handover configuration information, the handover configuration information is carried in a handover request confirmation message without a random handover process (RACH-LESS) sent by a target station and received by the source station, the RACH-LESS handover request confirmation information being sent to the source station based on the handover request received by the target station, the handover request including first spatial location information of the to-be-accessed terminal relative to the target station, and based on second spatial location information of each recorded successful handover reference terminal relative to the target station, when determining that the to-be-accessed terminal meets the RACH-LESS handover condition, based on the handover configuration information of the reference terminal;

[0034] Based on the handover configuration information, a RACH-LESS handover procedure is performed at the target station.

[0035] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance, a pitch angle, and a direction angle.

[0036] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance range, a pitch angle range, and a direction angle range, wherein:

[0037] The distance range is associated with the distance of the terminal relative to the target station and a preset distance step;

[0038] The pitch angle range is associated with the pitch angle of the terminal relative to the target station and a preset pitch angle step size;

[0039] The azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step size;

[0040] The terminal is a terminal to be accessed or a reference terminal.

[0041] In some embodiments, the switching configuration information of the reference terminal includes uplink grant UL-Grant, uplink transmit power and uplink timing advance TA.

[0042] In some embodiments, each reference terminal adjusts the switching configuration information of the reference terminal according to the corresponding terminal type, wherein the terminal type includes a common terminal and a dedicated terminal.

[0043] In a third aspect, an embodiment of the present application provides a handover device without a random access process, including:

[0044] A receiving module, configured to receive a handover request sent by a source station, wherein the handover request includes first spatial position information of the terminal to be accessed relative to the target station;

[0045] a determination module, configured to determine whether the terminal to be accessed satisfies a RACH-LESS handover condition without a random handover process based on the second spatial position information of each successfully handed-over reference terminal relative to the target station;

[0046] a sending module, configured to send RACH-LESS handover request confirmation information to the source station based on the handover configuration information of the reference terminal if the RACH-LESS handover condition is met, so that the terminal to be accessed performs the RACH-LESS handover process at the target station based on the received radio resource control RRC reconfiguration connection request message sent by the source station, wherein the RRC reconfiguration connection request message carries the handover configuration information.

[0047] In some embodiments, the determining module is specifically configured to:

[0048] Matching the first spatial location information with second spatial location information of at least one reference terminal that has successfully switched;

[0049] If the first spatial information successfully matches the second spatial location information of any reference terminal that has successfully switched, it is determined that the terminal to be accessed meets the RACH-LESS switching condition.

[0050] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance, a pitch angle, and a direction angle.

[0051] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance range, a pitch angle range, and a direction angle range, wherein:

[0052] The distance range is associated with the distance of the terminal relative to the target station and a preset distance step;

[0053] The pitch angle range is associated with the pitch angle of the terminal relative to the target station and a preset pitch angle step size;

[0054] The azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step size;

[0055] The terminal is a terminal to be accessed or a reference terminal.

[0056] In some embodiments, the switching configuration information of the reference terminal includes uplink grant UL-Grant, uplink transmit power and uplink timing advance TA.

[0057] In some embodiments, the handover request also includes third spatial location information of the terminal to be accessed relative to the source station, and before the sending module sends the RACH-LESS handover request confirmation information to the source station, it is further used to:

[0058] Determining a distance of the terminal to be accessed relative to the source station based on third spatial position information of the terminal to be accessed relative to the source station;

[0059] Determining a first time from the terminal to be accessed to the source station based on the distance of the terminal to be accessed relative to the source station and the speed of light; and

[0060] Determining a second time from the terminal to be accessed to the target station based on the distance between the terminal to be accessed and the target station and the speed of light;

[0061] The TA of the terminal to be accessed at the target station is determined based on the time difference between the first time and the second time, and the TA of the terminal to be accessed at the source station.

[0062] In some embodiments, the sending module is specifically configured to:

[0063] Based on the TA of the terminal to be accessed at the target station, RACH-LESS handover request confirmation information is sent to the source station.

[0064] In some embodiments, the sending module is further configured to:

[0065] If the RACH-LESS switching condition is not met, random access process RACH switching request confirmation information is sent to the source station.

[0066] In some embodiments, further comprising:

[0067] a recording module, configured to determine that the handover of the access terminal is successful if a radio resource control RRC reconfiguration completion message sent by the access terminal is received within a preset time after the sending module sends the random access process RACH handover request confirmation information / RACH-LESS handover request confirmation information to the source station;

[0068] Record the handover configuration information of the successful handover of the terminal to be accessed and the first spatial location information of the terminal to be accessed.

[0069] In some embodiments, each reference terminal adjusts the switching configuration information of the reference terminal according to the corresponding terminal type, wherein the terminal type includes a common terminal and a dedicated terminal.

[0070] In a fourth aspect, an embodiment of the present application provides a handover device without a random access process, including:

[0071] a receiving module, configured to receive a radio resource control (RRC) reconfiguration connection request message sent by a source station, wherein the RRC reconfiguration connection request message carries handover configuration information, the handover configuration information is carried in a handover request confirmation message without a random handover process (RACH-LESS) sent by a target station and received by the source station, the RACH-LESS handover request confirmation information being a handover request received by the target station based on the source station, the handover request including first spatial location information of the terminal to be accessed relative to the target station, and when determining that the terminal to be accessed meets the RACH-LESS handover condition based on second spatial location information of each recorded reference terminal that has successfully switched relative to the target station, the handover configuration information is sent to the source station based on the reference terminal;

[0072] The handover module is configured to execute a RACH-LESS handover process at the target station based on the handover configuration information.

[0073] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance, a pitch angle, and a direction angle.

[0074] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance range, a pitch angle range, and a direction angle range, wherein:

[0075] The distance range is associated with the distance of the terminal relative to the target station and a preset distance step;

[0076] The pitch angle range is associated with the pitch angle of the terminal relative to the target station and a preset pitch angle step size;

[0077] The azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step size;

[0078] The terminal is a terminal to be accessed or a reference terminal.

[0079] In some embodiments, the switching configuration information of the reference terminal includes uplink grant UL-Grant, uplink transmit power and uplink timing advance TA.

[0080] In some embodiments, each reference terminal adjusts the switching configuration information of the reference terminal according to the corresponding terminal type, wherein the terminal type includes a common terminal and a dedicated terminal.

[0081] In a fifth aspect, an embodiment of the present application provides a satellite base station, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein:

[0082] The memory stores a computer program that can be executed by at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the handover method without random access process of the first aspect.

[0083] In a sixth aspect, an embodiment of the present application provides a terminal, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein:

[0084] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the handover method without random access process of the second aspect mentioned above.

[0085] In a seventh aspect, an embodiment of the present application provides a computer storage medium. When the computer program in the computer storage medium is executed by a processor of a satellite base station, the satellite base station can perform the switching method without random access process of the above-mentioned first aspect.

[0086] In an eighth aspect, an embodiment of the present application provides a computer storage medium. When the computer program in the computer storage medium is executed by the processor of the terminal, the terminal can execute the switching method without random access process of the above-mentioned second aspect.

[0087] In an embodiment of the present application, a handover request sent by a source station is received, the handover request including first spatial location information of the terminal to be accessed relative to the target station, and based on the second spatial location information of each successfully switched reference terminal relative to the target station, it is determined whether the terminal to be accessed satisfies the RACH-LESS handover condition without a random handover process. If the RACH-LESS handover condition is satisfied, a RACH-LESS handover request confirmation message is sent to the source station based on the handover configuration information of the reference terminal, so that the terminal to be accessed executes the RACH-LESS handover process at the target station based on the received radio resource control RRC reconfiguration connection request message sent by the source station, wherein the RRC reconfiguration connection request message carries the handover configuration information. In this way, a match is performed between the spatial location information of the terminal to be accessed and the reference terminal for which the handover is successfully recorded. If the match is successful, the RACH-LESS handover can be performed according to the handover configuration information of the successfully matched reference terminal, thereby reducing the handover delay and RACH resource overhead and improving the success rate of the RACH-LESS handover.

[0088] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0090] Figure 1 A schematic diagram of a RACH process implemented by a terminal in a related technology provided in an embodiment of the present application;

[0091] Figure 2 A schematic diagram of a satellite operation scenario provided in an embodiment of the present application;

[0092] Figure 3 A schematic diagram of an application scenario of a handover method without a random access process provided in an embodiment of the present application;

[0093] Figure 4 A flowchart of a handover method without a random access process provided in an embodiment of the present application;

[0094] Figure 5 A flow chart of a method for determining a TA of a terminal to be accessed at a target station provided in an embodiment of the present application;

[0095] Figure 6 A flowchart of another handover method without a random access process provided in an embodiment of the present application;

[0096] Figure 7 A schematic structural diagram of a switching device without a random access process provided in an embodiment of the present application;

[0097] Figure 8 A schematic structural diagram of another switching device without a random access process provided in an embodiment of the present application;

[0098] Figure 9 A hardware structure diagram of a satellite base station for implementing a switching method without a random access process provided in an embodiment of the present application. DETAILED DESCRIPTION

[0099] In order to reduce handover delay and RACH resource overhead and improve RACH-LESS access success rate, embodiments of the present application provide a handover method, apparatus, base station, and storage medium without a random access process.

[0100] The preferred embodiments of the present application are described below in conjunction with the drawings in the specification. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application. In addition, the embodiments and features in the embodiments of the present application can be combined with each other if there is no conflict.

[0101] It should be noted that the terms "first", "second", etc. in the description of the embodiments of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In the description of the embodiments of the present application, unless otherwise specified, "plurality" refers to two or more. The character " / " generally indicates that the objects associated with each other are in an "or" relationship. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0102] In the prior art, the handover of a terminal between a source station and a target station usually requires a RACH process, such as Figure 1 As shown, Figure 1 A schematic diagram of the RACH process implemented by the terminal in a related technology provided in an embodiment of the present application. In the process of implementing random access, the source station sends a switching command to the terminal. After receiving the switching command, the terminal sends Msg1: Preamble to the target station. After receiving the preamble, the target station sends Msg2: RAR to the terminal to be accessed. The RAR contains the UE's TA, UL-Grant and other information for the target station. After receiving the RAR sent by the target station, the terminal to be accessed sends Msg3 to the target station, where the Msg3 is an RRC reconfiguration completion message to complete the switching. The switching delay generated in this switching process has a great impact on both the service quality and the system network performance. Moreover, in NTN, due to the movement of the satellite, it will trigger batch switching of UEs in the source station, which also leads to limited RACH resources. Figure 2 As shown, Figure 2 A schematic diagram of a satellite operation scenario provided in an embodiment of the present application, wherein cell 1 is the ground coverage area corresponding to satellite 1 when it is at position 1, and cell 2 is the ground coverage area corresponding to satellite 1 when it is at position 2. When satellite 1 moves from position 1 to position 2, it triggers batch switching of terminals in cell 1, resulting in limited RACH resources.

[0103] 3GPP proposed a RACH-LESS handover method to reduce handover delay and RACH resource overhead. However, this scenario has high requirements, such as requiring the source and target stations to have the same TA, and the handover success rate is low.

[0104] In view of this, the present application proposes a handover method without a random access process, which receives a handover request sent by a source station, wherein the handover request includes first spatial location information of the terminal to be accessed relative to the target station, and determines whether the terminal to be accessed meets the RACH-LESS handover condition without a random handover process based on the second spatial location information of each reference terminal that has successfully switched relative to the target station. If the RACH-LESS handover condition is met, a RACH-LESS handover request confirmation message is sent to the source station based on the handover configuration information of the reference terminal, so that the terminal to be accessed executes the RACH-LESS handover process at the target station based on the RRC reconfiguration connection request message received from the source station, wherein the RRC reconfiguration connection request message carries the handover configuration information. In this way, a match is performed between the spatial location information of the terminal to be accessed and the reference terminal that has successfully switched. If the match is successful, RACH-LESS handover can be performed according to the handover configuration information of the successfully matched reference terminal, which can reduce the handover delay and RACH resource overhead and improve the success rate of RACH-LESS handover.

[0105] The following briefly introduces the application scenarios of the technical solutions of the embodiments of the present application. It should be noted that the application scenarios described below are only used to illustrate the embodiments of the present application and are not limiting. In the specific implementation process, the technical solutions provided by the embodiments of the present application can be flexibly applied according to actual needs.

[0106] Figure 3 A schematic diagram of an application scenario of a handover method without a random access process provided in an embodiment of the present application includes: a source station 100, a terminal to be accessed 200, and a target station 300.

[0107] The source station 100 and the target station 300, also known as the next generation node B (gNB), are devices that provide access network services required by the communication system.

[0108] The terminal 200 to be connected can be any device with satellite communication capabilities, such as a mobile phone, tablet computer (PAD), laptop computer, desktop computer, smart TV, smart car device, and smart wearable device.

[0109] It should be understood that Figure 3 The terminal to be accessed is taken as an example of a mobile phone. In fact, according to the above introduction to the terminal to be accessed, the terminal to be accessed in the embodiment of the present application is not limited to a mobile phone.

[0110] After introducing the application scenarios of the embodiments of the present application, the handover without random access process proposed in the present application is described below with reference to specific embodiments. Figure 4 A flowchart of a handover method without random access process provided in an embodiment of the present application, which is applied to Figure 3 In the target station in, the method includes the following steps.

[0111] In step 401, a handover request sent by a source station is received, where the handover request includes first spatial position information of a terminal to be accessed relative to a target station.

[0112] During specific implementation, the source station will allocate some measurement information to terminals within the coverage area of ​​the source station, mainly used to measure the reference signal quality of the current serving cell and the neighboring cell (coverage area of ​​the target station). Then, based on the measurement report reported by the terminal, the source station makes a handover decision based on the measurement report results. If the handover conditions are met, a handover request is initiated to the target station. For example, the signal quality of the neighboring cell is higher than the signal quality of the current serving cell. The handover request includes the first spatial position information of the terminal to be accessed relative to the target station. The first spatial position information may include at least one of a distance, an elevation angle, and an azimuth angle. During specific implementation, the first spatial position information may also include at least one of a distance range, an elevation angle range, and an azimuth angle range.

[0113] In step 402, it is determined whether the terminal to be accessed satisfies a RACH-LESS handover condition without a random handover process based on the recorded second spatial position information of each successfully handed-over reference terminal relative to the target station.

[0114] In a specific implementation, each reference terminal that successfully switches includes a terminal that successfully switches through RACH-LESS and a terminal that successfully switches through RACH, and the second spatial position information may include at least one of a distance, an elevation angle, and a direction angle.

[0115] During specific implementation, the first spatial position information of the terminal to be accessed relative to the target station can be matched with the second spatial position information of at least one reference terminal that has successfully switched. If the first spatial position information of the terminal to be accessed relative to the target station successfully matches the second spatial position information of any reference terminal that has successfully switched, it is determined that the terminal to be accessed meets the RACH-LESS switching condition.

[0116] For example, taking the second spatial position information as distance, elevation angle, and azimuth angle as an example, the recorded second spatial position information of each successfully handed-over reference terminal relative to the target station is shown in Table 1.

[0117] Table 1

[0118] Reference terminal serial number distance Pitch angle Direction Access method Terminal 1 Distance 1 Pitch angle 1 Direction 1 RACH-LESS Terminal 2 Distance 2 Pitch angle 2 Direction 2 RACH-LESS Terminal 3 Distance 3 Pitch angle 3 Direction 3 RACH-LESS Terminal 4 Distance 4 Pitch angle 4 Direction 4 RACH

[0119] Assume that the first spatial position information of the terminal a to be accessed is (distance 1, pitch angle 1, direction angle 1), and match the first spatial position information of the terminal a to be accessed with the second spatial position information of each terminal in Table 1. Since the first spatial position information of the terminal a to be accessed is successfully matched with the second spatial position information of terminal 1, the terminal to be accessed meets the RACH-LESS switching condition.

[0120] During specific implementation, the first spatial position information / second spatial information may further include at least one of a distance range, an elevation angle range, and an azimuth angle range, wherein the distance range is associated with the distance of the terminal relative to the target station and a preset distance step, the elevation angle range is associated with the elevation angle of the terminal relative to the target station and a preset elevation angle step, and the azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step. The terminal here is a terminal to be accessed or a reference terminal.

[0121] For example, a distance step, an elevation step, and a azimuth step are pre-set, and then multiple distance ranges are set based on the preset distance step. Then, one distance step is set to distance range 1, and two distance steps are set to distance range 2. Similarly, multiple elevation ranges are set based on the preset elevation step, and multiple azimuth ranges are set based on the preset azimuth step. Then, based on the distance of the terminal from the target station and the preset distance step, the distance range of the terminal from the target station can be determined. Based on the elevation angle of the terminal from the target station and the preset elevation step, the elevation range of the terminal from the target station can be determined. Based on the azimuth angle of the terminal from the target station and the preset azimuth step, the azimuth range of the terminal from the target station can be determined. In this way, multiple situations may arise, such as two terminals at different distances may have the same distance range, two terminals at different elevation angles may have the same elevation range, two terminals at different azimuth angles may have the same azimuth range, and two terminals at the same distance range may have different elevation ranges and / or azimuth ranges. Assuming that, after calculation, the distance range of terminal 1 and terminal 2 in the above Table 1 is the same, the pitch angle range of terminal 1 and terminal 3 is the same, the direction angle range of terminal 2 and terminal 3 is the same, the distance range of terminal 4 and terminal 3 is the same, the pitch angle range of terminal 4 and each terminal is different, and the direction angle range of terminal 4 and each terminal is different, then the second spatial position information of each successful reference terminal in the above Table 1 can also be shown in Table 2.

[0122] Table 2

[0123]

[0124]

[0125] If the first spatial location information of the access terminal a is (distance range 1, elevation angle range 2, direction angle range 2), the first spatial location information of the access terminal a is matched with the second spatial location information of each terminal in Table 2. It can be seen that the first spatial location information of the access terminal a successfully matches the second spatial location information of terminal 2, and the access terminal meets the RACH-LESS switching condition;

[0126] If the first spatial position information of the terminal a to be accessed is (distance range 2, pitch angle range 3, direction angle range 3), the first spatial position information of the terminal a to be accessed is matched with the second spatial position information of each terminal in Table 2 respectively. It can be seen that the first spatial position information of the terminal a to be accessed is successfully matched with the second spatial position information of terminal 4, then the terminal to be accessed meets the RACH-LESS switching condition.

[0127] In step 403, if the RACH-LESS switching condition is met, RACH-LESS switching request confirmation information is sent to the source station based on the switching configuration information of the reference terminal, so that the terminal to be accessed performs the RACH-LESS switching process at the target station based on the received radio resource control RRC reconfiguration connection request message sent by the source station, wherein the RRC reconfiguration connection request message carries the switching configuration information.

[0128] The handover configuration information of the reference terminal includes uplink grant UL-Grant, uplink transmit power, and uplink timing advance TA.

[0129] Therefore, the information table of each successfully switched reference terminal in Table 2 may also be shown in Table 3.

[0130] Table 3

[0131]

[0132]

[0133] In specific implementation, in addition to sending the uplink grant UL-Grant and uplink transmit power to the terminal to be accessed, the TA of the terminal to be accessed at the target station needs to be carried in the handover request confirmation information and sent to the terminal to be accessed.

[0134] In a specific implementation, the handover request includes, in addition to the first spatial position information of the terminal to be accessed relative to the target station, the third spatial position information of the terminal to be accessed relative to the source station. Therefore, before the target station sends the RACH-LESS handover request confirmation information to the source station, the TA of the terminal to be accessed at the target station can also be determined through the following steps.

[0135] Figure 5A flow chart of a method for determining a TA of a terminal to be accessed at a target station is provided in an embodiment of the present application. The method includes the following steps.

[0136] In step 501, the distance of the terminal to be accessed relative to the source station is determined based on the third spatial position information of the terminal to be accessed relative to the source station.

[0137] The third spatial location information at least includes a distance or a distance range. Therefore, the distance between the terminal to be accessed and the source station can be confirmed from the third spatial location information.

[0138] In step 502, a first time from the terminal to be accessed to the source station is determined based on the distance of the terminal to be accessed relative to the source station and the speed of light.

[0139] In step 503, a second time from the terminal to be accessed to the target station is determined based on the distance between the terminal to be accessed and the target station and the speed of light.

[0140] In step 504, the TA of the terminal to be accessed at the target station is determined based on the time difference between the first time and the second time and the TA of the terminal to be accessed at the source station.

[0141] During specific implementation, after the target station sends RACH-LESS handover request confirmation information to the source station based on the handover configuration information of the reference terminal, the source station sends an RRC reconfiguration connection request message to the terminal to be accessed, wherein the message carries the handover configuration information, the target station information and the RACH-LESS handover identifier, etc. After receiving the RRC reconfiguration connection request message, the terminal to be accessed initiates the RACH-LESS handover process according to the handover configuration information of the handover instruction and sends an RRC reconfiguration completion message to the target station.

[0142] In specific implementation, if the target station receives the RRC reconfiguration completion message sent by the access terminal within the preset time, it determines that the access terminal has switched successfully, and records the switching configuration information of the access terminal's successful switching and the first spatial location information of the access terminal, and sends the switching success information to the source station.

[0143] Taking the information table of each successful handover reference terminal recorded in Table 3 as an example, assuming that the first spatial position information of the access terminal b successfully matches the second spatial position of the terminal 4, the target station sends a RACH-LESS handover request confirmation message to the source station based on the handover configuration information of the terminal 4 (uplink grant 4, power 4), so that the access terminal initiates the RACH-LESS handover process according to the handover configuration information of the handover instruction after receiving the RRC reconfiguration connection request message sent by the source station;

[0144] Assume that if the RRC reconfiguration completion message sent by the access terminal b is received within the preset time, it is determined that the access terminal b has switched successfully, and the switching configuration information of the successful switching of the access terminal b and the first spatial position information of the access terminal are recorded. Since Table 3 already contains information of terminal 4 that is the same as the switching configuration information of the successful switching of the access terminal b and the first spatial position information of the access terminal, in order to avoid repeated recording, only the switching method of terminal 4 can be updated, that is, the information table of each successful reference terminal in Table 3 is shown in Table 4.

[0145] Table 4

[0146]

[0147] Assume again that if the RRC reconfiguration completion message sent by the access terminal b is not received within the preset time, it is determined that the switching of the access terminal b has failed. At this time, the access terminal b can attempt to perform RACH access switching through competitive access. When it is determined that the switching of the access terminal b is successful, the switching configuration information of the successful switching of the access terminal b and the first spatial position information of the access terminal b are recorded. At this time, the information table of each successful reference terminal in Table 3 is shown in Table 5.

[0148] Table 5

[0149]

[0150] In specific implementation, if the first spatial position information of the terminal to be accessed relative to the target station fails to match the second spatial position information of each successfully switched reference terminal relative to the target station, the terminal to be accessed does not meet the RACH-LESS switching condition, and a RACH switching request confirmation message is sent to the source station. When it is determined that the switching of the terminal to be accessed is successful, the switching configuration information of the successful switching of the terminal to be accessed and the first spatial position information of the terminal to be accessed are recorded.

[0151] During specific implementation, each reference terminal can also adjust the switching configuration information of the reference terminal according to the corresponding terminal type, where the terminal type includes ordinary terminals and dedicated terminals. That is, the terminal type is different, and the uplink authorization, uplink transmission power and uplink timing advance corresponding to the terminal can be adjusted according to the preset adjustment value.

[0152] In the embodiment of the present application, the spatial location information and handover configuration information of each successfully switched terminal relative to the target station have been recorded. For the access terminal whose spatial location information is successfully matched, RACH-LESS handover can be performed according to the handover configuration information of the successfully matched reference terminal. For the access terminal whose spatial location information fails to match, RACH access can be re-accessed. When the RACH handover is successful, the handover configuration information of the successful handover of the access terminal and the spatial location information of the access terminal are recorded. The access terminal corresponding to the spatial location that subsequently matches successfully can perform RACH-LESS handover based on the updated handover configuration information. In this way, the RACH-LESS access success rate can be improved, and the handover delay and RACH resource overhead can be reduced.

[0153] Figure 6 A flowchart of another switching method without random access process provided in an embodiment of the present application, which is applied to Figure 3 In the terminal to be accessed, the method includes the following steps.

[0154] In step 601, a radio resource control RRC reconfiguration connection request message sent by a source station is received, wherein the RRC reconfiguration connection request message carries switching configuration information, and the switching configuration information is carried in a switching request confirmation message without a random switching process RACH-LESS sent by a target station received by the source station, and the RACH-LESS switching request confirmation information is a switching request received by the target station based on the source station, and the switching request includes first spatial position information of the terminal to be accessed relative to the target station. When it is determined that the terminal to be accessed meets the RACH-LESS switching condition according to the second spatial position information of each recorded successful switching reference terminal relative to the target station, the switching request is sent to the source station based on the switching configuration information of the reference terminal.

[0155] In step 602, a RACH-LESS handover procedure is performed at the target station based on the handover configuration information.

[0156] In a specific implementation, the first spatial position information / the second spatial information includes at least one of a distance, an elevation angle, and a azimuth angle. The first spatial position information / the second spatial information may also include at least one of a distance range, an elevation angle range, and an azimuth angle range, wherein: the distance range is associated with the distance of the terminal relative to the target station and a preset distance step; the elevation angle range is associated with the elevation angle of the terminal relative to the target station and a preset elevation step; and the azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step. Here, the terminal is a terminal to be accessed or a reference terminal.

[0157] During specific implementation, the handover configuration information of the reference terminal includes uplink authorization UL-Grant, uplink transmission power and uplink timing advance TA.

[0158] During specific implementation, each reference terminal may adjust the switching configuration information of the reference terminal according to the corresponding terminal type, wherein the terminal type includes a common terminal and a dedicated terminal.

[0159] Based on the same technical concept, an embodiment of the present application also provides a switching device without a random access process. The principle of solving the problem by the switching device without a random access process is similar to that of the above-mentioned switching method without a random access process. Therefore, the implementation of the switching device without a random access process can refer to the implementation of the switching method without a random access process, and the repeated parts will not be repeated.

[0160] Figure 7 A schematic structural diagram of a handover device without a random access process provided in an embodiment of the present application includes a receiving module 701 , a determining module 702 , and a sending module 703 .

[0161] A receiving module 701 is configured to receive a handover request sent by a source station, wherein the handover request includes first spatial location information of a terminal to be accessed relative to a target station;

[0162] A determination module 702 is configured to determine whether the terminal to be accessed satisfies a RACH-LESS handover condition based on the second spatial position information of each successfully handed-over reference terminal relative to the target station;

[0163] A sending module 703 is configured to send RACH-LESS handover request confirmation information to the source station based on the handover configuration information of the reference terminal if the RACH-LESS handover condition is met, so that the terminal to be accessed performs the RACH-LESS handover process at the target station based on the received radio resource control RRC reconfiguration connection request message sent by the source station, wherein the RRC reconfiguration connection request message carries the handover configuration information.

[0164] In some embodiments, the determining module 702 is specifically configured to:

[0165] Matching the first spatial location information with second spatial location information of at least one reference terminal that has successfully switched;

[0166] If the first spatial information successfully matches the second spatial location information of any reference terminal that has successfully switched, it is determined that the terminal to be accessed meets the RACH-LESS switching condition.

[0167] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance, a pitch angle, and a direction angle.

[0168] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance range, a pitch angle range, and a direction angle range, wherein:

[0169] The distance range is associated with the distance of the terminal relative to the target station and a preset distance step;

[0170] The pitch angle range is associated with the pitch angle of the terminal relative to the target station and a preset pitch angle step size;

[0171] The azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step size;

[0172] The terminal is a terminal to be accessed or a reference terminal.

[0173] In some embodiments, the switching configuration information of the reference terminal includes uplink grant UL-Grant, uplink transmit power and uplink timing advance TA.

[0174] In some embodiments, the handover request also includes third spatial location information of the terminal to be accessed relative to the source station, and before the sending module 703 sends the RACH-LESS handover request confirmation information to the source station, it is also used to:

[0175] Determining a distance of the terminal to be accessed relative to the source station based on third spatial position information of the terminal to be accessed relative to the source station;

[0176] Determining a first time from the terminal to be accessed to the source station based on the distance of the terminal to be accessed relative to the source station and the speed of light; and

[0177] Determining a second time from the terminal to be accessed to the target station based on the distance between the terminal to be accessed and the target station and the speed of light;

[0178] The TA of the terminal to be accessed at the target station is determined based on the time difference between the first time and the second time, and the TA of the terminal to be accessed at the source station.

[0179] In some embodiments, the sending module 703 is specifically configured to:

[0180] Based on the TA of the terminal to be accessed at the target station, a RACH-LESS handover request confirmation message is sent to the source station, where the handover request confirmation message carries the TA.

[0181] In some embodiments, the sending module 703 is further configured to:

[0182] If the RACH-LESS switching condition is not met, random access process RACH switching request confirmation information is sent to the source station.

[0183] In some embodiments, further comprising:

[0184] a recording module 704, configured to determine that the handover of the access terminal is successful if a radio resource control RRC reconfiguration completion message sent by the access terminal is received within a preset time after the sending module sends the random access process RACH handover request confirmation information / RACH-LESS handover request confirmation information to the source station;

[0185] Record the handover configuration information of the successful handover of the terminal to be accessed and the first spatial location information of the terminal to be accessed.

[0186] In some embodiments, each reference terminal adjusts the switching configuration information of the reference terminal according to the corresponding terminal type, wherein the terminal type includes a common terminal and a dedicated terminal.

[0187] Figure 8 A structural diagram of another switching device without a random access process provided in an embodiment of the present application includes a receiving module 801 and a switching module 802.

[0188] A receiving module 801 is configured to receive a radio resource control (RRC) reconfiguration connection request message sent by a source station, wherein the RRC reconfiguration connection request message carries handover configuration information, and the handover configuration information is carried in a handover request confirmation message for a RACH-LESS handover process sent by a target station and received by the source station. The RACH-LESS handover request confirmation information is sent to the source station based on the handover request received by the target station, the handover request including first spatial location information of the to-be-accessed terminal relative to the target station, and based on the second spatial location information of each recorded successful handover reference terminal relative to the target station, when it is determined that the to-be-accessed terminal meets the RACH-LESS handover condition, based on the handover configuration information of the reference terminal;

[0189] The handover module 802 is configured to execute a RACH-LESS handover process at the target station based on the handover configuration information.

[0190] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance, a pitch angle, and a direction angle.

[0191] In some embodiments, the first spatial position information / the second spatial information includes at least one of a distance range, a pitch angle range, and a direction angle range, wherein:

[0192] The distance range is associated with the distance of the terminal relative to the target station and a preset distance step;

[0193] The pitch angle range is associated with the pitch angle of the terminal relative to the target station and a preset pitch angle step size;

[0194] The azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step size;

[0195] The terminal is a terminal to be accessed or a reference terminal.

[0196] In some embodiments, the switching configuration information of the reference terminal includes uplink grant UL-Grant, uplink transmit power and uplink timing advance TA.

[0197] In some embodiments, each reference terminal adjusts the switching configuration information of the reference terminal according to the corresponding terminal type, wherein the terminal type includes a common terminal and a dedicated terminal.

[0198] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, the functional modules in the embodiments of the present application may be integrated into one processor, or may exist physically separately, or two or more modules may be integrated into one module. The coupling between the modules can be achieved through some interfaces, which are usually electrical communication interfaces, but it is not ruled out that they may be mechanical interfaces or other forms of interfaces. Therefore, the modules described as separate components may or may not be physically separated, and may be located in one place or distributed to different locations of the same or different devices. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0199] After introducing the handover method and apparatus without random access procedure according to an exemplary embodiment of the present application, a satellite base station according to another exemplary embodiment of the present application is introduced next.

[0200] Refer to the following Figure 9 To describe the satellite base station 900 implemented according to this embodiment of the present application. Figure 9 The satellite base station 900 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0201] like Figure 9 As shown, the satellite base station 900 includes a processor 901 , a memory 902 , and a communication interface 903 . The processor 901 , the memory 902 , and the communication interface 903 are interconnected via a bus 904 .

[0202] The processor 901 is configured to read and execute instructions in the memory 902, so that the at least one processor can execute the handover method without random access process provided in the above embodiment.

[0203] The memory 902 is used to store various instructions and programs of the handover method without random access process provided by the above embodiment.

[0204] The bus 904 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 9 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0205] The processor 901 may be a central processing unit (CPU), a network processor (NP), a graphic processing unit (GPU), or any combination of a CPU, NP, and GPU. It may also be a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0206] In an exemplary embodiment, a computer storage medium is also provided. When a computer program in the computer storage medium is executed by a processor of a satellite base station, the satellite base station can perform the above-mentioned handover method without a random access procedure. Optionally, the computer storage medium can be a non-transitory computer-readable storage medium, for example, a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0207] In an exemplary embodiment, a computer program product is further provided. When the computer program product is executed by a processor of a satellite base station, the satellite base station can implement any exemplary method provided in this application.

[0208] Furthermore, the computer program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, RAM, ROM, an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0209] In the embodiments of the present application, the program product for handover without a random access procedure may be implemented as a CD-ROM and include program code, and may be run on a computing device. However, the program product of the present application is not limited thereto. In this document, a readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0210] A readable signal medium may include a data signal transmitted in baseband or as part of a carrier wave, which carries readable program code. Such a transmitted data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium that can transmit, propagate, or transfer a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0211] The program code contained on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

[0212] The program code for performing the operations of the present application can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user computing device through any type of network, such as a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0213] It should be noted that although several units or subunits of the device are mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, depending on the embodiment of the application, the features and functions of two or more units described above can be embodied in a single unit. Conversely, the features and functions of a single unit described above can be further divided and embodied by multiple units.

[0214] Furthermore, although the operations of the method of the present application are described in a particular order in the accompanying drawings, this does not require or imply that the operations must be performed in this particular order, or that all illustrated operations must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps.

[0215] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0216] The present application is described with reference to the flowcharts and / or block diagrams of the methods, apparatus (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0217] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0218] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0219] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0220] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A handover method without random access process, characterized in that: include: Receiving a handover request sent by a source station, wherein the handover request includes first spatial position information of the terminal to be accessed relative to the target station; Determining whether the terminal to be accessed meets a RACH-LESS handover condition without a random handover process based on the second spatial position information of each successfully handed-over reference terminal relative to the target station; If the RACH-LESS switching condition is met, RACH-LESS switching request confirmation information is sent to the source station based on the switching configuration information of the reference terminal, so that the terminal to be accessed performs the RACH-LESS switching process at the target station based on the received radio resource control RRC reconfiguration connection request message sent by the source station, wherein the RRC reconfiguration connection request message carries the switching configuration information.

2. The method according to claim 1, wherein The determining, based on the recorded second spatial position information of each successfully switched reference terminal relative to the target station, whether the terminal to be accessed satisfies a RACH-LESS switching condition without a random switching process includes: Matching the first spatial location information with second spatial location information of at least one reference terminal that has successfully switched; If the first spatial information successfully matches the second spatial location information of any reference terminal that has successfully switched, it is determined that the terminal to be accessed meets the RACH-LESS switching condition.

3. The method according to claim 1 or 2, characterized in that The first spatial position information / the second spatial information includes at least one of a distance, a pitch angle, and a direction angle.

4. The method according to claim 1 or 2, characterized in that The first spatial position information / the second spatial information includes at least one of a distance range, a pitch angle range, and a direction angle range, wherein: The distance range is associated with the distance of the terminal relative to the target station and a preset distance step; The pitch angle range is associated with the pitch angle of the terminal relative to the target station and a preset pitch angle step size; The azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step size; The terminal is a terminal to be accessed or a reference terminal.

5. The method according to claim 1, wherein The handover configuration information of the reference terminal includes uplink grant UL-Grant, uplink transmit power and uplink timing advance TA.

6. The method according to claim 1, wherein The handover request also includes third spatial location information of the terminal to be accessed relative to the source station. Before sending the RACH-LESS handover request confirmation information to the source station, the method further includes: Determining a distance of the terminal to be accessed relative to the source station based on third spatial position information of the terminal to be accessed relative to the source station; Determining a first time from the terminal to be accessed to the source station based on the distance of the terminal to be accessed relative to the source station and the speed of light; and Determining a second time from the terminal to be accessed to the target station based on the distance between the terminal to be accessed and the target station and the speed of light; The TA of the terminal to be accessed at the target station is determined based on the time difference between the first time and the second time, and the TA of the terminal to be accessed at the source station.

7. The method according to claim 6, wherein Sending RACH-LESS handover request confirmation information to the source station includes: Based on the TA of the terminal to be accessed at the target station, a RACH-LESS handover request confirmation message is sent to the source station, where the handover request confirmation message carries the TA.

8. The method according to claim 1, wherein Also includes: If the RACH-LESS switching condition is not met, random access process RACH switching request confirmation information is sent to the source station.

9. The method according to claim 8, wherein After sending the random access process RACH handover request confirmation information / RACH-LESS handover request confirmation information to the source station, the method further includes: If a radio resource control (RRC) reconfiguration completion message sent by the access terminal is received within a preset time, it is determined that the access terminal is successfully switched; Record the handover configuration information of the successful handover of the terminal to be accessed and the first spatial location information of the terminal to be accessed.

10. The method according to claim 1, wherein Each reference terminal adjusts the switching configuration information of the reference terminal according to the corresponding terminal type, wherein the terminal type includes a common terminal and a dedicated terminal.

11. A handover method without random access process, characterized in that: include: Receiving a radio resource control (RRC) reconfiguration connection request message sent by a source station, wherein the RRC reconfiguration connection request message carries handover configuration information, the handover configuration information is carried in a handover request confirmation message without a random handover process (RACH-LESS) sent by a target station and received by the source station, the RACH-LESS handover request confirmation information being sent to the source station based on the handover request received by the target station, the handover request including first spatial location information of the to-be-accessed terminal relative to the target station, and based on second spatial location information of each recorded successful handover reference terminal relative to the target station, when determining that the to-be-accessed terminal meets the RACH-LESS handover condition, based on the handover configuration information of the reference terminal; Based on the handover configuration information, a RACH-LESS handover procedure is performed at the target station.

12. The method according to claim 11, characterized in that The first spatial position information / the second spatial information includes at least one of a distance, a pitch angle, and a direction angle.

13. The method according to claim 12, characterized in that The first spatial position information / the second spatial information includes at least one of a distance range, a pitch angle range, and a direction angle range, wherein: The distance range is associated with the distance of the terminal relative to the target station and a preset distance step; The pitch angle range is associated with the pitch angle of the terminal relative to the target station and a preset pitch angle step size; The azimuth angle range is associated with the azimuth angle of the terminal relative to the target station and a preset azimuth angle step size; The terminal is a terminal to be accessed or a reference terminal.

14. The method according to claim 12, characterized in that The handover configuration information of the reference terminal includes uplink grant UL-Grant, uplink transmit power and uplink timing advance TA.

15. The method according to claim 11, wherein Each reference terminal adjusts the switching configuration information of the reference terminal according to the corresponding terminal type, wherein the terminal type includes a common terminal and a dedicated terminal.

16. A handover device without random access process, characterized in that: include: A receiving module, configured to receive a handover request sent by a source station, wherein the handover request includes first spatial position information of the terminal to be accessed relative to the target station; a determination module, configured to determine whether the terminal to be accessed satisfies a RACH-LESS handover condition without a random handover process based on the second spatial position information of each successfully handed-over reference terminal relative to the target station; a sending module, configured to send RACH-LESS handover request confirmation information to the source station based on the handover configuration information of the reference terminal if the RACH-LESS handover condition is met, so that the terminal to be accessed performs the RACH-LESS handover process at the target station based on the received radio resource control RRC reconfiguration connection request message sent by the source station, wherein the RRC reconfiguration connection request message carries the handover configuration information.

17. A handover device without random access process, characterized in that: include: a receiving module, configured to receive a radio resource control (RRC) reconfiguration connection request message sent by a source station, wherein the RRC reconfiguration connection request message carries handover configuration information, the handover configuration information is carried in a handover request confirmation message without a random handover process (RACH-LESS) sent by a target station and received by the source station, the RACH-LESS handover request confirmation information being a handover request received by the target station based on the source station, the handover request including first spatial location information of the terminal to be accessed relative to the target station, and when determining that the terminal to be accessed meets the RACH-LESS handover condition based on second spatial location information of each recorded reference terminal that has successfully switched relative to the target station, the handover configuration information is sent to the source station based on the reference terminal; The handover module is configured to execute a RACH-LESS handover process at the target station based on the handover configuration information.

18. A satellite base station, characterized in that: include: at least one processor, and a memory communicatively coupled to the at least one processor, wherein: The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 10.

19. A terminal, characterized in that: include: at least one processor, and a memory communicatively coupled to the at least one processor, wherein: The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 11 to 15.

20. A computer storage medium, characterized in that When the computer program in the computer storage medium is executed by a processor of a satellite base station, the satellite base station can perform the method according to any one of claims 1 to 10.

21. A computer storage medium, characterized in that When the computer program in the computer storage medium is executed by a processor of a terminal, the terminal can execute the method according to any one of claims 11 to 15.

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