CP configuration method, message sending method, device, equipment, storage medium and program product

Abstract

The invention provides a CP configuration method and device, a message sending method and device, equipment, a storage medium and a program product, and relates to the technical field of communication. In the method, the satellite base station dynamically adjusts the CP length under the condition that the demodulation of the MSG3 message is failed and the current CP is configured as the normal CP, so that the anti-interference capability of the signal is enhanced, the reliability of MSG3 message transmission and the success rate of random access are improved, and the user experience is improved. The problem that terminal access is affected due to MGS3 message demodulation failure caused by the fact that the normal CP length is not enough to cope with the long delay characteristic of satellite communication in an existing scheme is effectively solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a CP configuration method, a message sending method, an apparatus, a device, a storage medium, and a program product. Background Art

[0002] In 5G non-terrestrial network (NTN) communication systems, the random access process between a terminal and a satellite or high-altitude platform base station is a critical step in establishing the initial wireless connection. The existing random access mechanism is based on a four-step interaction process: MSG1 (Physical Random Access Channel (PRACH) preamble), MSG2 (Random Access Response (RAR)), MSG3 (Radio Resource Control (RRC) connection request), and MSG4 (Content Resolution Message). MSG3 is the first message to carry higher-layer signaling and plays a decisive role in the success of random access. It uses the same Orthogonal Frequency Division Multiplexing (OFDM) modulation scheme as conventional uplink data, but the cyclic prefix (CP) length may be insufficient in NTN environments.

[0003] In existing technologies, although the CP length of the PRACH channel has been optimized in NTN scenarios, the CP length of MSG3 usually follows the standard setting of the terrestrial network. This may cause demodulation failure due to inter-symbol interference (ISI) caused by delay in the NTN environment, thereby affecting terminal access. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a CP configuration method, a message sending method, an apparatus, a device, a storage medium, and a program product to improve the problem in the prior art that the CP length of the MSG3 message follows the standard setting of the terrestrial network, which is prone to demodulation failure in the NTN scenario and thus affects terminal access.

[0005] In a first aspect, an embodiment of the present application provides a CP configuration method, which is applied to a satellite base station. The method includes: When it is detected that demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP, a first CP configuration change message is sent to the terminal; The first CP configuration change message is used to instruct the terminal to change the CP configuration to an extended CP.

[0006] In the above implementation process, by dynamically adjusting the CP length when detecting that the MSG3 message demodulation fails and the current CP is configured as a normal CP, the signal's anti-interference capability is enhanced, the reliability of MSG3 message transmission and the success rate of random access are improved, and the problem of the existing solution in which the normal CP length is insufficient to cope with the long delay characteristics of satellite communications, resulting in the failure of MGS3 message demodulation and affecting terminal access, is effectively solved.

[0007] Optionally, when detecting that demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP, sending a first CP configuration change message to the terminal includes: When it is detected that the number of demodulation failures of the MSG3 message reaches a set threshold and the current CP configuration is a normal CP, a first CP configuration change message is sent to the terminal.

[0008] In the above implementation process, the CP configuration change is triggered by setting the threshold of the number of MSG3 demodulation failures, thereby avoiding frequent changes in CP configuration due to occasional demodulation failures, thereby reducing unnecessary signaling overhead and waste of system resources.

[0009] Optionally, after sending the first CP configuration change message to the terminal, the method further includes: receiving a MSG3 message resent by the terminal according to the extended CP; When it is detected that demodulation of the retransmitted MSG3 message fails and the number of times the MSG3 message is retransmitted reaches a set number, prompt information of random access failure is sent to the terminal.

[0010] In the above implementation, after the terminal retransmits the MSG3 message based on the extended CP, a retransmission limit mechanism is introduced. If demodulation of the retransmitted MSG3 message continues to fail and the set number of retransmissions has been reached, the base station sends a random access failure notification message to the terminal. This mechanism prevents the terminal from endlessly retransmitting the MSG3 message, thereby conserving radio resources and reducing signaling overhead.

[0011] Optionally, the sending a first CP configuration change message to the terminal includes: A first CP configuration change message is sent to the terminal through an RRC reconfiguration message, wherein the cp-Type field in the RRC reconfiguration message is used to indicate the extended CP.

[0012] In the above implementation, a first CP configuration change message is sent to the terminal via an RRC reconfiguration message, and the CP-Type field in the message explicitly indicates the extended CP, enabling precise control of the terminal's CP configuration. This fully leverages the flexibility and standardization of the RRC reconfiguration process, making the CP configuration change process more efficient and reliable.

[0013] Optionally, before sending the first CP configuration change message to the terminal when it is detected that the MSG3 message demodulation fails and the current CP configuration is a normal CP, the method further includes: An initial CP configuration message is broadcasted via system information block 1, the initial CP configuration message including an initial CP configuration, the initial CP configuration being a normal CP or an extended CP, and the initial CP configuration message being used to instruct the terminal to generate a MSG3 message according to the initial CP configuration.

[0014] In the above implementation, the initial CP configuration message is broadcast via System Information Block 1 (SIB1), informing the terminal of the initial CP configuration (normal CP or extended CP) in advance. This allows the terminal to know the CP configuration to use and generate the MSG3 message before triggering random access. This mechanism provides clear initial configuration guidance for the terminal, ensuring that it uses the appropriate CP mode during its first access. This improves the success rate of first-time access, reduces access failures and retransmissions caused by improper CP configuration, and optimizes the efficiency and reliability of the random access process.

[0015] Optionally, broadcasting the initial CP configuration message through the system information block 1 includes: Determining an initial CP configuration message according to the orbital altitude and / or historical delay data of the satellite base station; The initial CP configuration message is broadcasted via system information block 1.

[0016] In the above implementation process, by determining the initial CP configuration based on the orbital altitude and / or historical delay data of the satellite base station, accurate adaptation to different satellite orbits and communication delay characteristics is achieved, ensuring that the terminal uses the CP configuration (normal CP or extended CP) most suitable for the current communication environment when it first accesses, thereby significantly improving the efficiency and reliability of random access.

[0017] Optionally, before sending the first CP configuration change message to the terminal when it is detected that the MSG3 message demodulation fails and the current CP configuration is a normal CP, the method further includes: When it is determined that the timing advance is greater than the set threshold and the current CP configuration is a normal CP, a second CP configuration change message is sent to the terminal, where the second CP configuration change message is used to instruct the terminal to change the CP configuration to the extended CP.

[0018] In the above implementation process, before the terminal sends MSG3, the CP configuration is adjusted in advance based on the TA's prediction, thereby effectively coping with possible long delay problems and reducing the risk of inter-symbol interference and demodulation failure caused by delay.

[0019] In a second aspect, an embodiment of the present application provides a message sending method, applied to a terminal, the method comprising: receiving a first CP configuration change message sent by a satellite base station, where the first CP configuration change message includes an extended CP; Generate a MSG3 message according to the extended CP in the first CP configuration change message and resend the message to the satellite base station.

[0020] In the above implementation process, the terminal generates the MSG3 message according to the extended CP and then retransmits it, which can ensure that the terminal uses the appropriate CP configuration during the random access process and improve the demodulation success rate of the MSG3 message.

[0021] In a third aspect, an embodiment of the present application provides a CP configuration device, which is applied to a satellite base station. The device includes: A message sending module, configured to send a first CP configuration change message to the terminal when detecting that demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP; The first CP configuration change message is used to instruct the terminal to change the CP configuration to an extended CP.

[0022] In a fourth aspect, an embodiment of the present application provides an electronic device comprising a processor and a memory, wherein the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the steps in the method provided in the first or second aspect above are executed.

[0023] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method provided in the first or second aspect above are executed.

[0024] In a sixth aspect, an embodiment of the present application provides a computer program product, comprising computer program instructions, which, when read and executed by a processor, execute the steps of the method provided in the first or second aspect above.

[0025] 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 be understood by practicing the embodiments of the present application. The objectives and other advantages of the present application can be achieved and obtained through the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of a multi-beam mobile satellite communication system provided in an embodiment of the present application; Figure 2 A schematic diagram of a contention-based random access process of a terminal provided in an embodiment of the present application; Figure 3 A flowchart of a CP configuration method provided in an embodiment of the present application; Figure 4 A flowchart of a message sending method provided in an embodiment of the present application; Figure 5 A structural block diagram of a CP configuration device provided in an embodiment of the present application; Figure 6 A structural block diagram of a message sending device provided in an embodiment of the present application; Figure 7 A schematic structural diagram of an electronic device for executing a CP configuration method or a message sending method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application.

[0029] It should be noted that the terms "system" and "network" in the embodiments of the present invention are used interchangeably. "Multiple" refers to two or more. In view of this, in the embodiments of the present invention, "multiple" can also be understood as "at least two." "And / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the related objects are in an "or" relationship.

[0030] It should also be noted that all actions of obtaining signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

[0031] The technical solution of the present application can be applied to non-terrestrial network (NTN) systems such as satellite communication systems, high altitude platform station (HAPS) communications, for example, integrated communication and navigation (ICaN) systems, global navigation satellite systems (GNSS), etc.

[0032] Satellite communication systems can be integrated with traditional mobile communication systems. For example, the mobile communication systems may include fourth-generation (4G) communication systems (e.g., long-term evolution (LTE) systems), worldwide interoperability for microwave access (WiMAX) communication systems, fifth-generation (5G) communication systems (e.g., new radio (NR) systems), and future mobile communication systems.

[0033] See also Figure 1 , Figure 1 Schematic diagram of a multi-beam mobile satellite communication system applicable to an embodiment of the present application. Figure 1 , the satellite provides communication services to the terminal device through multiple beams. The satellite in this scenario is a non-geostationary earth orbit (NGEO) satellite, and the satellite is connected to the core network equipment. The satellite uses multiple beams to cover the service area, and different beams can communicate through one or more of time division, frequency division and space division. The satellite provides communication and navigation services to the terminal device by broadcasting communication signals and navigation signals. The satellite base station mentioned in the embodiments of the present application can also be a satellite, or a network-side device carried on a satellite.

[0034] For example, satellite communication systems can be divided into the following three types based on the satellite's orbital altitude: geostationary earth orbit (GEO) satellite communication system, also known as synchronous orbit satellite communication system; medium earth orbit (MEO) satellite communication system; and low earth orbit (LEO) satellite communication system. Among them, the GEO satellite orbit altitude is 35,786 km. Its main advantage is that it can remain stationary relative to the ground and provide a large coverage area. However, GEO satellite communication also has obvious disadvantages: GEO satellite orbits are far away from the earth, and free space propagation losses are large, resulting in a tight communication link budget. In addition, in order to increase the transmission or reception gain, the satellite needs to be equipped with a larger diameter antenna; GEO communication transmission delay is large, which can reach a round-trip delay of about 500ms, which cannot meet the needs of low-latency services; GEO orbital resources are also relatively scarce, the launch cost is high, and it cannot provide coverage for the earth's polar regions. MEO satellites orbit at altitudes between 2,000 and 35,786 km. Their advantage is that they can achieve global coverage with a relatively small number of satellites. However, their orbits are higher than LEO, and communication transmission latency is still higher than that of LEO satellites. LEO satellites, on the other hand, orbit at altitudes between 300 and 2,000 km. LEO satellites are lower than MEO and GEO orbits, offering advantages such as lower data transmission latency, lower transmission loss, and lower launch costs. Of course, in some specific application scenarios, LEO satellites can be replaced with GEO or MEO satellites, or even a combination of multiple types of satellites.

[0035] The satellite system used in the embodiments of the present application may be a non-geostationary orbit satellite system, namely, MEO or LEO.

[0036] The terminals mentioned in the embodiments of the present application include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem with wireless communication functions, and may specifically refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal may also be a satellite phone, a cellular phone, a smart phone, a wireless data card, a wireless modem, a machine type communication device, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device or a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, a terminal device in a 5G network or a future communication network, etc.

[0037] Please refer to Figure 2 The following describes the process of establishing an initial wireless connection between the terminal and the satellite base station based on a competitive random access mechanism involved in the present application scheme. The process mainly includes four interactive messages, each of which has a specific function and role.

[0038] MSG1 (PRACH preamble) is the initial step in the random access process. The terminal transmits a specific preamble sequence over the physical random access channel (PRACH) to achieve initial uplink synchronization and request access. The preamble uses a Zadoff-Chu sequence with excellent autocorrelation characteristics, enabling reliable detection by the base station even in the presence of large timing errors. In NTN scenarios, MSG1 transmission requires special consideration of the long latency associated with extremely long distances. Therefore, the CP length of the PRACH channel is typically appropriately extended.

[0039] MSG2 (Random Access Response, RAR) is the satellite base station's response to the detection of MSG1. After successfully detecting the preamble, the satellite base station transmits the RAR message on the Physical Downlink Shared Channel (PDSCH). This message contains three key pieces of information: a Timing Advance (TA) to compensate for propagation delay, a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI) for subsequent communications, and an uplink resource grant for the transmission of MSG3. In an NTN system, due to long propagation delays, there can be a significant time difference between the reception of MSG2 and the transmission of MSG1.

[0040] MSG3 (RRC Connection Request) is the first message to carry higher-layer signaling and is the most critical step in the random access process. The terminal uses the uplink resources allocated in MSG2 to send the RRC Connection Request over the Physical Uplink Shared Channel (PUSCH). This message contains important information, such as the terminal's identity (such as the Short Term Mobile Subscriber Identity (S-TMSI) or a random number) and the establishment reason. Its successful reception and demodulation directly determine the success or failure of the random access.

[0041] MSG4 (Content Resolution Message) is the final step in the random access process. The base station confirms the UE's identity by sending a contention resolution identifier, completing the access process. In NTN scenarios, due to propagation delay, the entire process from sending MSG3 to receiving MSG4 can take hundreds of milliseconds, potentially impacting services with high real-time requirements.

[0042] Specifically, in the NTN system, communication latency varies significantly depending on the satellite's orbital altitude. One-way latency for geostationary Earth orbit (GEO) satellites can reach up to 250ms. While latency for low Earth orbit (LEO) satellites is shorter (approximately 10-50ms), the high-speed motion of the satellites relative to the ground (typical LEO satellite speeds are approximately 7.8 km / s) results in constant and dynamic changes. This latency severely impacts the random access process, particularly the transmission reliability of MSG3.

[0043] In the random access process described above, the current MSG3 message uses the same OFDM modulation scheme as conventional uplink data in physical layer design. However, its cyclic prefix (CP) length still follows the standard setting of terrestrial networks (typically 4.7-16.7 μs). This may not be sufficient to cope with the challenges brought about by extremely long delays and dynamic delay variations in NTN environments.

[0044] The importance of MSG3 lies in three key aspects: First, it is the first formal request for a terminal to establish an RRC connection with the network. It carries key identification information, such as the S-TMSI or random number. The success or failure of its transmission directly determines the normal operation of all subsequent communication processes. Second, the transmission quality of MSG3 directly affects system access latency and user experience. In the long latency environment of the NTN, a single MSG3 transmission failure can mean hundreds of milliseconds of additional delay. Most importantly, as the first message transmitted via the PUSCH channel, the demodulation performance of MSG3 directly reflects the system's physical layer transmission capabilities and is a key indicator for evaluating NTN system reliability.

[0045] In LEO satellite communications, due to the high-speed motion of satellites, propagation delay is constantly changing, with a rate of change reaching tens of microseconds per second. When the actual delay variation exceeds the CP length, it causes inter-symbol interference (ISI), severely impacting signal demodulation and, in turn, hindering terminal access.

[0046] Based on the above problems, an embodiment of the present application provides a CP configuration method, which is applied to a satellite base station. The satellite base station dynamically adjusts the CP length when it detects that the MSG3 message demodulation fails and the current CP is configured as a normal CP, thereby enhancing the signal's anti-interference capability, improving the reliability of MSG3 message transmission and the success rate of random access, and effectively solving the problem in the existing solution that the normal CP length is insufficient to cope with the long delay characteristics of satellite communications, resulting in the failure of MGS3 message demodulation and affecting terminal access.

[0047] The CP configuration method of the present application can be executed by a satellite base station, or by a component of a satellite base station, such as a processor, chip, chip system, or circuit of the satellite base station. It can also be implemented by a logic module or software that can implement all or part of the base station functions. The following description uses the method executed by a satellite base station as an example.

[0048] The following are some terms involved in this solution.

[0049] 1. CP: In communication systems, CP is a piece of replicated data located in front of the OFDM symbol. Its main function is to eliminate the inter-symbol interference caused by multipath propagation. Multipath propagation means that the signal reaches the receiver from different paths. Due to the different path lengths, the signal will have different delays. Without CP, these delayed signals may interfere with the demodulation of adjacent symbols.

[0050] 2. Normal CP: Also known as Normal CP, this is a relatively short CP. Its length is mainly determined based on the expected multipath delay spread in the system and is in a normal proportional range compared to the total length of the OFDM symbol.

[0051] Normal CP is suitable for scenarios with relatively short multipath delay and high spectral efficiency. Because the CP is an overhead portion that does not carry valid information, the shorter the CP length, the higher the proportion of time spent transmitting valid data within an OFDM symbol period. Normal CP effectively balances signal protection and spectral efficiency.

[0052] 3. Extended CP: Also known as Extended CP, this is a longer CP that can handle more severe multipath delay spread. Extended CP is suitable for scenarios with long multipath delay, but it has relatively low spectral efficiency. Because the CP occupies a larger portion of the symbol time, the proportion of time available for transmitting valid data is reduced.

[0053] Please refer to Figure 3 , Figure 3 A flowchart of a CP configuration method provided in an embodiment of the present application, which is applied to a satellite base station, includes the following steps: Step S110: When it is detected that demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP, a first CP configuration change message is sent to the terminal.

[0054] During random access, the terminal sends a MSG3 message to the satellite base station. Upon receiving the MSG3 message, the satellite base station demodulates it. As mentioned above, if the delay variation exceeds the CP length of the MSG3 message, it can cause intersymbol interference, which in turn affects correct signal demodulation. Therefore, when the satellite base station detects a demodulation failure of the MSG3 message, it can determine that the CP length of the MSG3 message may not match the current delay. In this case, the current CP configuration can be obtained.

[0055] The current CP configuration refers to the current CP configuration of the terminal. The MSG3 message sent by the terminal is generated based on the CP length in the current CP configuration. The CP configuration is sent to the terminal by the satellite base station, so the satellite base station stores the current CP configuration. If the current CP configuration is a normal CP, it means that its CP length is short, and the MSG3 message fails to be demodulated, it is likely caused by the CP length mismatch delay. In this case, the satellite base station sends a first CP configuration change message to the terminal.

[0056] The first CP configuration change message is used to instruct the terminal to change the CP configuration to an extended CP. That is, the first CP configuration change message may include instruction information for instructing the terminal to change the CP configuration to an extended CP. After receiving the first CP configuration change message, the terminal may obtain the extended CP from the message and change the current CP configuration to the extended CP. The terminal may then regenerate the MSG3 message using the extended CP and resend the MSG3 message to the satellite base station.

[0057] Specifically, the satellite base station may continuously monitor the demodulation status of the MSG3 message during the terminal's random access process and, upon detecting a demodulation failure, record the demodulation failure event. The satellite base station then checks the current CP configuration. If the current CP configuration is confirmed to be a normal CP, the satellite base station generates a first CP configuration change message containing instruction information instructing the terminal to change the CP configuration to an extended CP.

[0058] Based on the received new CP configuration information, the terminal updates its local CP configuration parameters and switches the CP mode from normal CP to extended CP. During subsequent random access procedures, the terminal sends MSG3 messages using the new extended CP configuration. If the terminal is in the process of random access and needs to retransmit MSG3, it immediately applies the new CP configuration for the retransmission.

[0059] The satellite base station can continue to monitor the demodulation status of the terminal's retransmitted MSG3 messages to evaluate whether the new CP configuration has effectively improved demodulation performance. If the satellite base station finds that the terminal still experiences demodulation failures or other issues under the new CP configuration, it can take further optimization measures, such as adjusting power control and optimizing resource allocation.

[0060] In the above implementation process, by dynamically adjusting the CP length when detecting that the MSG3 message demodulation fails and the current CP is configured as a normal CP, the signal's anti-interference capability is enhanced, the reliability of MSG3 message transmission and the success rate of random access are improved, and the problem of the existing solution in which the normal CP length is insufficient to cope with the long delay characteristics of satellite communications, resulting in the failure of MGS3 message demodulation and affecting terminal access, is effectively solved.

[0061] Based on the above embodiments, in order to avoid the problem of resource waste or incorrect switching caused by frequent switching of CP configuration (for example, the failure of MSG3 message demodulation may not be caused by insufficient CP length, but may be caused by power fluctuation), in this case, the satellite base station can also send a first CP configuration change message to the terminal when it detects that the number of demodulation failures of the MSG3 message reaches a set threshold and the current CP configuration is a normal CP.

[0062] The satellite base station can maintain a MSG3 message demodulation failure counter for each terminal, with an initial value of 0. Each time the satellite base station detects an MSG3 message demodulation failure, it increments the corresponding counter by 1. The satellite base station compares the demodulation failure counter value with a set threshold (which can be set according to actual needs, such as 3 times). If the number of demodulation failures reaches the set threshold, the satellite base station checks whether the current CP configuration is normal. If it is normal, the satellite base station generates a first CP configuration change message and sends it to the terminal.

[0063] In some implementations, the threshold value may also be determined based on the satellite type. For example, for LEO satellites, which experience high-speed movement and rapid latency changes, the threshold value may be set to 1. A single MSG3 message handover failure indicates that the latency has exceeded the CP length, requiring immediate handover to quickly compensate for the dynamic latency. However, for LEO satellites with orbital altitudes between 1000 and 2000 km, which may move more slowly, the threshold value may be set to 2 to avoid false triggering of CP handover due to MSG3 message demodulation failures caused by other factors. For MEO satellites, which experience relatively high latency, the probability of MSG3 message demodulation failures due to CP length not meeting the required latency threshold is higher, so the threshold value may be set to 1.

[0064] In the above implementation process, the CP configuration change is triggered by setting the threshold of the number of MSG3 demodulation failures, thereby avoiding frequent changes in CP configuration due to occasional demodulation failures, thereby reducing unnecessary signaling overhead and waste of system resources.

[0065] Based on the above embodiment, after the satellite base station sends the first CP configuration change message to the terminal, the terminal can regenerate the MSG3 message according to the extended CP and then send it. The satellite base station monitors the uplink shared channel and receives the MSG3 message retransmitted by the terminal according to the extended CP. When it is detected that the demodulation of the retransmitted MSG3 message fails and the number of retransmissions of the MSG3 message reaches the set number, a prompt message of random access failure is sent to the terminal.

[0066] Specifically, the satellite base station demodulates the received retransmitted MSG3 message and attempts to retrieve the RRC connection request information contained therein. If demodulation fails again, the satellite base station records the demodulation failure and sends a retransmission message to the terminal, instructing it to continue retransmitting the MSG3 message. The satellite base station counts the number of MSG3 retransmissions by the terminal to determine whether the number of retransmissions reaches a set threshold (e.g., 3 or 5, which can be flexibly set based on actual needs). If the number of retransmitted MSG3 messages reaches the set threshold and demodulation still fails, the satellite base station generates a random access failure notification message and sends it to the terminal.

[0067] The satellite base station can send a random access failure notification to the terminal via the Physical Downlink Control Channel (PDCCH) or a Random Access Response (RAR) message. This notification can include the cause of the failure (e.g., "MSG3 demodulation failed multiple times"). Upon receiving the notification, the terminal can take appropriate action based on the content of the notification, such as suspending the random access process, reporting it to higher-layer applications, or taking other recovery measures.

[0068] In the above implementation, after the terminal retransmits the MSG3 message based on the extended CP, a retransmission limit mechanism is introduced. If demodulation of the retransmitted MSG3 message continues to fail and the set number of retransmissions has been reached, the base station sends a random access failure notification message to the terminal. This mechanism prevents the terminal from endlessly retransmitting the MSG3 message, thereby conserving radio resources and reducing signaling overhead.

[0069] Based on the above embodiment, the satellite base station may send a first CP configuration change message to the terminal via an RRC reconfiguration message, wherein the cp-Type field in the RRC reconfiguration message is used to indicate an extended CP.

[0070] In this implementation, the satellite base station may first generate an RRC reconfiguration message and set the cp-Type field in the message to the extended CP. That is, the cp-Type field is used to indicate the first CP configuration change message. In addition to the cp-Type field, the satellite base station may also include other relevant radio resource configuration parameters, such as power control and resource allocation, in the RRC reconfiguration message as needed to ensure that the terminal can better communicate in the new CP mode.

[0071] The satellite base station schedules the physical downlink shared channel (PDSCH) through the physical downlink control channel (PDCCH) to transmit the RRC reconfiguration message. The satellite base station encapsulates the RRC reconfiguration message in the PDSCH and sends it to the terminal through the radio interface.

[0072] The terminal continuously monitors the PDCCH to obtain downlink control information (DCI). The terminal decodes the DCI and determines the information scheduled by the base station, including whether there is an indication of an RRC reconfiguration message. If the DCI indicates an RRC reconfiguration message, the terminal receives the message from the PDSCH and parses the RRC reconfiguration message to obtain the new CP-Type field value and other relevant configuration parameters. Based on the CP-Type field value in the RRC reconfiguration message, the terminal updates the local CP configuration from the normal CP to the extended CP.

[0073] In some other implementations, the satellite base station may also send a first CP configuration change message through a system information block (System Information Block Type 1, SIB1). For example, the satellite base station updates the cp-Type field in SIB1 to an extended CP and generates a system message change notification message, which is sent to the terminal through PDCCH. After receiving the notification, the terminal re-reads SIB1 to obtain the new CP configuration information.

[0074] In the above implementation, a first CP configuration change message is sent to the terminal via an RRC reconfiguration message, and the CP-Type field in the message explicitly indicates the extended CP, enabling precise control of the terminal's CP configuration. This fully leverages the flexibility and standardization of the RRC reconfiguration process, making the CP configuration change process more efficient and reliable.

[0075] Based on the above embodiment, before the terminal triggers random access, the satellite base station can broadcast an initial CP configuration message through system information block 1. The initial CP configuration message includes an initial CP configuration. The initial CP configuration is a normal CP or an extended CP. The initial CP configuration message is used to instruct the terminal to generate an MSG3 message according to the initial CP configuration.

[0076] The satellite base station can determine the initial CP configuration, either normal or extended, based on factors such as current network conditions, satellite orbit characteristics, and expected communication latency. For example, for MEO satellites, extended CP may be selected as the initial configuration due to their relatively large one-way latency. For LEO satellites, the initial CP configuration can be determined based on their typical latency range (10-50ms) and high-speed motion characteristics.

[0077] The satellite base station encapsulates the initial CP configuration message in the SIB1 message. The SIB1 message is a key broadcast information block in the 5G system. In addition to the CP configuration information, it also contains other basic cell configuration parameters, such as cell selection information and PRACH configuration. The cp-Type field in the SIB1 clearly indicates whether the initial CP configuration is a normal CP or an extended CP.

[0078] The satellite base station sends the constructed SIB1 message to all terminals within its coverage area via the downlink broadcast channel (BCH). The BCH typically has a fixed transmission period and scheduling method to ensure that terminals can regularly receive and obtain the latest system information.

[0079] After powering on and joining the network or entering the coverage area of ​​a new satellite base station, the terminal begins monitoring the BCH and receiving SIB1 messages. Based on pre-set BCH decoding parameters and scheduling information, the terminal decodes and extracts the SIB1 content from the downlink signal. The terminal parses the received SIB1 message and obtains the value of the CP-Type field, thereby determining whether the initial CP configuration broadcast by the satellite base station is a normal CP or an extended CP. The terminal stores this initial CP configuration information in its local radio resource configuration parameters for use in subsequent random access procedures.

[0080] When a terminal needs to send data or establish a connection with the network, the random access procedure is triggered. At this point, the terminal prepares the corresponding MSG3 message based on the previously acquired and stored initial CP configuration. The terminal constructs the MSG3 message according to the initial CP configuration. At the physical layer, the terminal sets the corresponding cyclic prefix length based on the CP configuration to ensure that the generated MSG3 message conforms to the format and parameters required by the satellite base station. The MSG3 message contains higher-layer signaling information, such as the RRC connection request. During the random access procedure, the terminal transmits the generated MSG3 message to the satellite base station via the Physical Uplink Shared Channel (PUSCH) according to the specified time-frequency resource location. The CP configuration used is the initial CP configuration indicated in SIB1.

[0081] The satellite base station demodulates the received MSG3 message and extracts the high-layer signaling information. During demodulation, the satellite base station processes the signal's cyclic prefix based on the initial CP configuration to account for potential delays and multipath effects. If the satellite base station successfully demodulates the MSG3 message, it proceeds with the subsequent steps of the random access process. If demodulation fails, the satellite base station checks whether the current CP configuration is a normal CP. If so, it sends a first CP configuration change message to the terminal. If the current CP configuration is an extended CP, demodulation also fails. In this case, the satellite base station may send an access failure prompt to the terminal or continue to wait for the terminal to retransmit.

[0082] In the above implementation, the initial CP configuration message is broadcast via SIB1, informing the terminal of the initial CP configuration (normal CP or extended CP) in advance. This allows the terminal to know the CP configuration to use and generate the MSG3 message before triggering random access. This mechanism provides clear initial configuration guidance for the terminal, ensuring that it uses the appropriate CP mode during its first access. This improves the success rate of first-time access, reduces access failures and retransmissions caused by improper CP configuration, and optimizes the efficiency and reliability of the random access process.

[0083] Based on the above embodiment, when determining the initial CP configuration, the satellite base station may also determine the initial CP configuration message according to the orbital altitude and / or historical delay data of the satellite base station, and then broadcast the initial CP configuration message through SIB1.

[0084] Satellite base stations can accurately determine their orbital altitude using their own navigation systems or data provided by ground control centers. They continuously collect historical latency data, including communication latency records with each terminal. This data can be obtained through signaling exchanges between the satellite base station and the terminal, or by referencing past latency statistics from the same orbital position and similar communication scenarios.

[0085] For example, for high-orbit satellites MEO, extended CP can be selected. That is, if the orbital altitude of the satellite base station is high, the initial CP configuration message includes extended CP. For low-orbit satellites LEO, the orbital altitude is low and the communication delay is relatively small, so it can be determined that the initial CP configuration message includes normal CP.

[0086] Satellite base stations can obtain historical latency data over a period of time and calculate the average of this data. For cells with large average latency values ​​(e.g., greater than a set threshold), extended CP can be selected as the initial CP configuration. For cells with average latency values ​​less than or equal to the set threshold, normal CP can be selected as the initial CP configuration. For example, if the historical average latency within the coverage area of ​​a satellite base station at its current location is greater than the set threshold, extended CP is selected as the initial CP configuration. Conversely, if the average latency value is smaller, normal CP can be selected.

[0087] In the above implementation process, by determining the initial CP configuration based on the orbital altitude and / or historical delay data of the satellite base station, accurate adaptation to different satellite orbits and communication delay characteristics is achieved, ensuring that the terminal uses the CP configuration (normal CP or extended CP) most suitable for the current communication environment when it first accesses, thereby significantly improving the efficiency and reliability of random access.

[0088] On the basis of the above embodiment, in order to improve the success rate of MGS3 message demodulation, the change of CP configuration can also be triggered in advance. For example, when it is determined that the timing advance TA is greater than the set threshold and the current CP configuration is a normal CP, a second CP configuration change message is sent to the terminal. The second CP configuration change information is used to instruct the terminal to change the CP configuration to an extended CP, so that the terminal can generate an MSG3 message based on the extended CP and send it to the satellite base station.

[0089] Among them, after receiving the MSG1 message sent by the terminal, the satellite base station will calculate TA based on the difference between the arrival time of the MSG1 message and the expected arrival time. TA is used to measure the time synchronization deviation between the terminal and the satellite base station, which reflects the delay of the signal in wireless propagation.

[0090] Satellite base stations can pre-set a threshold, which can be configured based on factors such as satellite orbit altitude, historical latency data, or system performance requirements. For example, for low-orbit satellites (low latency), the threshold can be set to a lower value, while for high-orbit satellites (higher latency), the threshold can be increased. For satellites with historically high latency, the threshold can be increased, while for satellites with historically low latency, the threshold can be decreased. Satellites with high system performance requirements are more sensitive to latency, so the threshold can be set to a lower value. Satellites with lower system performance requirements can have a relatively higher threshold.

[0091] Before sending the MSG2 message, the base station compares the calculated TA with a set threshold. If the TA exceeds the set threshold, the base station checks the current CP configuration. If the current CP configuration is normal, the CP configuration change process is triggered. At this point, the base station can simultaneously send the MSG2 message and a second CP configuration change message, or send the second CP configuration change message first and then the MSG2 message. Regardless of whether the TA exceeds the set threshold, the satellite base station must generate and send the MSG2 message to the terminal. The MSG2 message contains TA information and other relevant random access response parameters, such as the temporary identifier (TC-RNTI) and uplink resource grant.

[0092] The second CP configuration change message may be sent through dedicated signaling (such as an RRC reconfiguration message) or may be sent through a SIB1 message.

[0093] After receiving the second CP configuration change message, the terminal parses it to obtain the new CP configuration parameters, namely the extended CP. The terminal updates its local CP configuration based on the extended CP and generates a MSG3 message, which it then sends to the satellite base station. Upon receiving the MSG3 message, the satellite base station demodulates the message. If demodulation fails, it checks the current CP configuration and finds it is an extended CP. The satellite base station can then perform other processing, such as instructing the terminal to retransmit the message or sending a random access failure notification message to the terminal.

[0094] Of course, when TA is less than or equal to the set threshold, the satellite base station will not trigger the CP configuration change process in advance. At this time, the terminal still generates the MSG3 message based on the initial CP configuration. In this case, the satellite base station triggers the CP configuration change process after the MSG3 message demodulation fails.

[0095] Understandably, in this implementation, the satellite base station sets two triggering times for the CP configuration change process: once when the TA exceeds a set threshold, and once when MSG3 message demodulation fails. If the TA is less than or equal to the set threshold, the satellite base station does not trigger the CP configuration change process prematurely. Instead, it waits for the demodulation result of the MSG3 message. If demodulation fails, the CP configuration change process is triggered again. The CP configuration change process first determines whether the current CP configuration is a normal CP. If so, the CP configuration is changed to an extended CP, completing the CP configuration change.

[0096] When the TA exceeds the set threshold, it indicates that the terminal may be in a communication environment with a large delay. If the normal CP is still used at this time, the MSG3 message may experience inter-symbol interference during transmission due to the large delay, affecting the demodulation success rate. Therefore, the satellite base station triggers the CP configuration to change to the extended CP in advance to adapt to the larger delay, improve the signal's anti-interference capability and demodulation success rate, and optimize the random access process.

[0097] In the above implementation process, before the terminal sends MSG3, the CP configuration is adjusted in advance based on the TA's prediction, thereby effectively coping with possible long delay problems and reducing the risk of inter-symbol interference and demodulation failure caused by delay.

[0098] In summary, this solution offers significant advantages in terms of implementation complexity and system adaptability. First, by triggering CP configuration switching through the explicit event of MSG3 demodulation failure, it avoids complex delay prediction algorithms and significantly reduces implementation complexity. Second, it fully reuses the existing 5G CP configuration mechanism without introducing any new fields or signaling processes, ensuring that the solution can be immediately deployed on existing NTN networks. Finally, by adopting a unidirectional progressive switching strategy (Normal CP → Extended CP), it effectively prevents resource waste caused by excessive CP length growth while ensuring delay compensation. For some terminals that do not support dynamic switching, the system automatically falls back to fixed CP mode.

[0099] Please refer to Figure 4 , Figure 4 A flowchart of a message sending method provided in an embodiment of the present application, the method comprising the following steps: Step S210: Receive a first CP configuration change message sent by a satellite base station.

[0100] The first CP configuration change message includes an extended CP. For reference, the relevant description in the above embodiment can be referred to. The first CP configuration change message is sent by the satellite base station when it detects that the demodulation of the MSG3 message fails and the current CP configuration is a normal CP.

[0101] Step S220: Generate a MSG3 message according to the extended CP in the first CP configuration change message and resend it to the satellite base station.

[0102] The detailed implementation process of this embodiment can refer to the relevant description in the above embodiment. For the sake of brevity, it will not be repeated here.

[0103] It can be understood that the execution subject of the message sending method can be a terminal, or it can be executed by a component of the terminal, such as the terminal's processor, chip, chip system, or circuit, etc., or it can be implemented by a logic module or software that can realize all or part of the terminal functions.

[0104] In this implementation, the terminal generates a MSG3 message based on the extended CP and then retransmits it, which can ensure that the terminal uses an appropriate CP configuration during the random access process and improve the demodulation success rate of the MSG3 message.

[0105] Please refer to Figure 5 , Figure 5This is a block diagram of a CP configuration apparatus 300 provided in an embodiment of the present application. The CP configuration apparatus 300 may be a module, program segment, or code on a satellite base station. It should be understood that the CP configuration apparatus 300 corresponds to the CP configuration method embodiment described above and is capable of performing each step involved in the CP configuration method embodiment. The specific functions of the CP configuration apparatus 300 can be found in the description above; to avoid repetition, a detailed description is omitted here.

[0106] Optionally, the CP configuration device 300 includes: The message sending module 310 is configured to send a first CP configuration change message to the terminal when detecting that demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP; The first CP configuration change message is used to instruct the terminal to change the CP configuration to an extended CP.

[0107] Optionally, the message sending module 310 is configured to send a first CP configuration change message to the terminal when detecting that the number of demodulation failures of the MSG3 message reaches a set threshold and the current CP configuration is a normal CP.

[0108] Optionally, the CP configuration device 300 further includes: The access failure processing module is used to receive the MSG3 message retransmitted by the terminal according to the extended CP; when it is detected that the demodulation of the retransmitted MSG3 message fails and the number of retransmissions of the MSG3 message reaches a set number, it sends a prompt message of random access failure to the terminal.

[0109] Optionally, the message sending module 310 is configured to send a first CP configuration change message to the terminal via an RRC reconfiguration message, wherein a cp-Type field in the RRC reconfiguration message is used to indicate the extended CP.

[0110] Optionally, the message sending module 310 is further used to broadcast an initial CP configuration message through system information block 1, where the initial CP configuration message includes an initial CP configuration, where the initial CP configuration is a normal CP or an extended CP, and the initial CP configuration message is used to instruct the terminal to generate a MSG3 message according to the initial CP configuration.

[0111] Optionally, the message sending module 310 is configured to determine an initial CP configuration message according to the orbital altitude and / or historical delay data of the satellite base station; and broadcast the initial CP configuration message through system information block 1.

[0112] Optionally, the message sending module 310 is further configured to send a second CP configuration change message to the terminal when it is determined that the timing advance is greater than a set threshold and the current CP configuration is a normal CP, wherein the second CP configuration change message is used to instruct the terminal to change the CP configuration to the extended CP.

[0113] Please refer to Figure 6 , Figure 6 This is a block diagram of a message sending device 400 provided in an embodiment of the present application. The message sending device 400 may be a module, program segment, or code on an electronic device. It should be understood that the message sending device 400 corresponds to the above-mentioned message sending method embodiment and is capable of performing each step involved in the message sending method embodiment. The specific functions of the message sending device 400 can be found in the description above. To avoid repetition, a detailed description is omitted here.

[0114] Optionally, the message sending device 400 includes: The message receiving module 410 is configured to receive a first CP configuration change message sent by a satellite base station, where the first CP configuration change message includes an extended CP; The message resending module 420 is configured to generate a MSG3 message according to the extended CP in the first CP configuration change message and resend the message to the satellite base station.

[0115] It should be noted that those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0116] Please refer to Figure 7 , Figure 7 A structural diagram of an electronic device for executing a CP configuration method or a message sending method provided in an embodiment of the present application, wherein the electronic device may include: at least one processor 510, such as a CPU, at least one communication interface 520, at least one memory 530, and at least one communication bus 540. The communication bus 540 is used to realize connection and communication between these components. The communication interface 520 of the device in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 530 can be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage. The memory 530 can optionally be at least one storage device located away from the aforementioned processor. The memory 530 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 510, the electronic device performs the above-mentioned method process.

[0117] I understand. Figure 7The structure shown is only for illustration, and the electronic device may also include Figure 7 More or fewer components than shown, or with Figure 7 Different configurations shown. Figure 7 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0118] As an implementation method, the electronic device may be a satellite base station, and the terminal may be wirelessly connected to the satellite base station. The satellite base station may be configured with a module for implementing base station functions. The module for implementing satellite base station functions may implement the functions of the following devices: a base station, an evolved NodeB (eNodeB or eNB), a transmission reception point (TRP), a next-generation NodeB (gNB) in a fifth-generation (5G) mobile communication system, a next-generation base station in a sixth-generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system.

[0119] The aforementioned satellite base station may also include an antenna and a transceiver. In the uplink, uplink signals from terminals are received via the antenna, modulated by the transceiver, and further processed by the processor 510 to recover the signaling information sent by the terminal. In the downlink, signaling messages are processed by the processor 510 and modulated by the transceiver to generate downlink signals, which are transmitted to the terminal via the antenna. The processor 510 is further configured to execute the CP configuration method described in the above embodiment.

[0120] It will be understood that the above only introduces a simplified design of a satellite base station. In actual applications, a satellite base station may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all satellite base stations that can implement this application are within the scope of protection of this application.

[0121] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method process executed by the electronic device in the above method embodiment is executed.

[0122] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can perform the methods provided in the above method embodiments, for example, including: When it is detected that demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP, a first CP configuration change message is sent to the terminal; The first CP configuration change message is used to instruct the terminal to change the CP configuration to an extended CP.

[0123] In summary, the embodiments of the present application provide a CP configuration method, a message sending method, an apparatus, a device, a storage medium, and a program product. The satellite base station dynamically adjusts the CP length when detecting that the MSG3 message demodulation fails and the current CP is configured as a normal CP, thereby enhancing the signal's anti-interference capability, improving the reliability of MSG3 message transmission and the success rate of random access, and effectively solving the problem in the existing solution that the normal CP length is insufficient to cope with the long delay characteristics of satellite communications, resulting in the failure of MGS3 message demodulation and affecting terminal access.

[0124] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0125] In addition, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0126] Furthermore, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0127] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

[0128] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A CP configuration method, characterized in that: Applied to a satellite base station, the method includes: When it is detected that demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP, a first CP configuration change message is sent to the terminal; The first CP configuration change message is used to instruct the terminal to change the CP configuration to an extended CP.

2. The method according to claim 1, characterized in that The sending a first CP configuration change message to the terminal when detecting that the demodulation failure of the MSG3 message is and the current CP configuration is a normal CP includes: When it is detected that the number of demodulation failures of the MSG3 message reaches a set threshold and the current CP configuration is a normal CP, a first CP configuration change message is sent to the terminal.

3. The method according to claim 1, characterized in that After sending the first CP configuration change message to the terminal, the method further includes: receiving a MSG3 message resent by the terminal according to the extended CP; When it is detected that demodulation of the retransmitted MSG3 message fails and the number of times the MSG3 message is retransmitted reaches a set number, prompt information of random access failure is sent to the terminal.

4. The method according to claim 1, wherein The sending a first CP configuration change message to the terminal includes: A first CP configuration change message is sent to the terminal through an RRC reconfiguration message, wherein the cp-Type field in the RRC reconfiguration message is used to indicate the extended CP.

5. The method according to claim 1, wherein Before sending the first CP configuration change message to the terminal when it is detected that the demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP, the method further includes: An initial CP configuration message is broadcasted via system information block 1, the initial CP configuration message including an initial CP configuration, the initial CP configuration being a normal CP or an extended CP, and the initial CP configuration message being used to instruct the terminal to generate a MSG3 message according to the initial CP configuration.

6. The method according to claim 5, characterized in that The broadcasting of the initial CP configuration message through the system information block 1 includes: Determining an initial CP configuration message according to the orbital altitude and / or historical delay data of the satellite base station; The initial CP configuration message is broadcasted via system information block 1.

7. The method according to any one of claims 1 to 6, characterized in that: Before sending the first CP configuration change message to the terminal when it is detected that the demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP, the method further includes: When it is determined that the timing advance is greater than the set threshold and the current CP configuration is a normal CP, a second CP configuration change message is sent to the terminal, where the second CP configuration change message is used to instruct the terminal to change the CP configuration to the extended CP.

8. A message sending method, characterized in that: Applied to a terminal, the method includes: receiving a first CP configuration change message sent by a satellite base station, where the first CP configuration change message includes an extended CP; Generate a MSG3 message according to the extended CP in the first CP configuration change message and resend the message to the satellite base station.

9. A CP configuration device, characterized in that: Applied to a satellite base station, the device comprises: A message sending module, configured to send a first CP configuration change message to the terminal when detecting that demodulation failure of the MSG3 message is detected and the current CP configuration is a normal CP; The first CP configuration change message is used to instruct the terminal to change the CP configuration to an extended CP.

10. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the method according to any one of claims 1 to 8 is executed.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 8 is executed.

12. A computer program product, characterized in that The method comprises computer program instructions, and when the computer program instructions are read and executed by a processor, the method according to any one of claims 1 to 8 is executed.

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