Communication method, electronic equipment and storage medium

Abstract

Provided are a communication method, an electronic device and a storage medium, the method comprising: a base station sending a system information block comprising configuration information to a user equipment, the configuration information being used for instructing the user equipment to determine whether an Msg4 retransmission process needs to be triggered in a current signal coverage area; if the user equipment determines that an Msg4 retransmission process needs to be triggered in the current signal coverage range, retransmission instruction information for the Msg4 is sent to the base station through the Msg3; and the base station verifies whether retransmission is really needed according to the retransmission request information, if the retransmission is really needed, the base station sends Msg4 to the user equipment for multiple times, and the user equipment sends response information to the base station after receiving and decoding the Msg4, so that the connection between the user equipment and the base station is established. Through the technical scheme of the invention, the receiving reliability of the Msg4 is improved, and the success rate of accessing the network by the user equipment is further improved.

Description

Technical Field

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

[0002] With the rapid development of 5G and NTN (Non-Terrestrial Networks), such as satellite communications, the Internet of Things (IoT), and the Internet of Vehicles (IoV), the success rate of user equipment (UE) with wireless communication capabilities accessing the NTN has always been a research focus. In particular, the random access process through the RACH (Random Access Channel) is a key step in establishing a connection between the UE and the base station (commonly known as the gNB).

[0003] The random access process via RACH typically involves the exchange of four messages (Msg1 to Msg4) between the user equipment and the base station. Msg4 is the contention resolution message sent by the base station to the user equipment, and its reliable transmission directly affects the success rate of the user equipment's access to the NTN.

[0004] In view of this, this application is hereby filed. Summary of the Invention

[0005] The present application aims to provide a communication method, electronic device and storage medium, the purpose of which is to improve the reception reliability of Msg4 and thereby improve the success rate of user equipment accessing the network.

[0006] In a first aspect, an embodiment of the present application provides a communication method, applied to a user equipment, including:

[0007] In response to receiving a system information block sent by a base station, determining configuration information from the system information block;

[0008] Determine whether a Msg4 retransmission process needs to be triggered within the current signal coverage range according to the configuration information;

[0009] In response to determining that a Msg4 retransmission process needs to be triggered within the current signal coverage range, sending retransmission request information for Msg4 to the base station via Msg3 sent to the base station;

[0010] Receive Msg4 sent by the base station according to the retransmission request information, and establish a connection with the base station according to the Msg4.

[0011] In a second aspect, an embodiment of the present application further provides a communication method, applied to a base station, comprising:

[0012] Sending a system information block to a user equipment;

[0013] Receive Msg3 sent by the user equipment, determine the retransmission strategy information of Msg4, and send the retransmission strategy information of Msg4 to the user equipment;

[0014] And, sending Msg4 to the user equipment according to the retransmission strategy information, and establishing a connection with the user equipment upon receiving a response message indicating successful decoding of Msg4 fed back by the user equipment.

[0015] In a third aspect, an embodiment of the present application further provides an electronic device, comprising:

[0016] processor and memory;

[0017] The processor is configured to execute the steps of the communication method as described in any embodiment by calling the program or instructions stored in the memory.

[0018] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a program or instructions, and the program or instructions enable a computer to execute the steps of the communication method as described in any embodiment.

[0019] In summary, the present application proposes a communication method, in which a base station sends configuration information to a user equipment, and the user equipment determines whether it is necessary to trigger the Msg4 retransmission process within the current signal coverage range based on the configuration information. When it is determined that the current signal coverage range needs to trigger the Msg4 retransmission process, the retransmission request information for Msg4 is sent to the base station through Msg3 sent to the base station, and the base station receives Msg4 sent according to the retransmission request information, thereby realizing the dynamic setting and execution of Msg4 retransmission, improving the reception reliability of Msg4, and thereby improving the success rate of user equipment accessing the network, solving the problem that a single Msg4 transmission may not be received and correctly decoded by the user equipment due to the extremely large path loss caused by the ultra-long distance of the NTN, the problem that Msg4 is easily lost due to weak signals at the edge of the cell, and the problem of abnormal communication channels due to interference signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a process of a communication method provided by an embodiment of the present application Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the interaction between a user equipment and a base station provided in an embodiment of the present application. Figure 1 ;

[0022] Figure 3 This is a process of a communication method provided by an embodiment of the present application Figure 2 ;

[0023] Figure 4 This is a logical diagram of a decision-making process for determining whether retransmission is actually required, as provided in an embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of the interaction between a user equipment and a base station provided in an embodiment of the present application. Figure 2 ;

[0025] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0027] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] As described in the background, random access (RACH) is a key step in establishing a connection between a user equipment (UE) and a base station (gNB). Typically, the random access process is triggered when a UE attempts to register with a network for the first time, or when it moves from one base station's coverage area to another (i.e., when it switches networks).

[0029] According to the communication protocol standard, the process of random access through RACH usually includes the exchange of four messages (Msg1, Msg2, Msg3 and Msg4) between the user equipment and the base station, such as Figure 1 As shown. Msg1 is sent by the user equipment to the base station. It is a random access preamble code, which is a string of agreed sequences. The purpose is to enable the base station to identify the access request of the user equipment. Msg2 is sent by the base station to the user equipment. It is the random access response that the base station feeds back to the user equipment when it receives Msg1. It is used to allocate temporary resources to the user equipment. Msg3 is the RRC (Radio Resource Control) connection request sent by the user equipment to the base station, which is equivalent to a formal network access application. In this step, the user equipment uses the temporary resources indicated in Msg2 to send Msg3 to the base station. Msg4 is sent by the base station to the user equipment. It includes the confirmation of "agreeing to establish a connection" and the parameters to be used after connecting to the network (such as frequency band, power control, etc.).

[0030] In summary, Msg4 is an RRC connection establishment message (such as RRCSetup) sent by the base station to the user equipment through the PDSCH (Physical Downlink Shared Channel, a communication channel) in the random access process.

[0031] In particular, such as Figure 1 As shown in the figure, before the user equipment sends Msg1 to the base station, the user equipment achieves time synchronization and cell identification by detecting the SSB (Synchronization Signal Block) of the base station. The SSB includes the PBCH (Physical Broadcast Channel), which carries the MIB (Master Information Block). After decoding the MIB, the most basic system information, such as cell bandwidth, subcarrier spacing, system frame number, etc., can be obtained, so that the user equipment can initially adapt to the base station environment. After that, the base station sends the System Information Block Type 1 (SIB1), which includes PRACH (Physical Random Access Channel) resources. Subsequently, the user equipment sends Msg1 via PRACH.

[0032] Based on the above background, the embodiments of the present application aim to solve the problem that a single Msg4 transmission may not be received and correctly decoded by the user equipment due to the extremely large path loss caused by the ultra-long distance of the NTN, the problem that Msg4 is easily lost due to weak signals at the edge of the cell, and the problem of abnormal communication channels due to interference signals, thereby ultimately improving the reception reliability of Msg4 and thereby improving the success rate of user equipment access to the network.

[0033] Figure 2 This is a flow chart of a communication method provided in an embodiment of the present application. This communication method is applied to a user device, and is specifically applied to scenarios where the user device accesses a network, including network handover scenarios where the user device is powered on for the first time to register with the network, or where the user device moves from the network coverage area of ​​one base station to the network coverage area of ​​another base station. User devices refer to terminals with wireless communication capabilities, including but not limited to smartphones, smart tablets, smart watches, and smart connected cars.

[0034] See also Figure 2 , the communication method specifically includes the following steps:

[0035] S210: In response to receiving a system information block sent by a base station, determine configuration information from the system information block.

[0036] The system information block refers to System Information Block Type 1 (SIB1), which includes PRACH (Physical Random Access Channel) resources. Subsequently, the user equipment sends Msg1 via the PRACH.

[0037] In this embodiment of the present application, configuration information is added to SIB1 to assist the user equipment in determining whether to trigger the Msg4 retransmission process within the current signal coverage area. When the user equipment receives SIB1, it parses it to obtain the configuration information. The current signal coverage area includes the cell range of a cellular network or the beam range of a satellite network.

[0038] The core objectives of repeatedly sending Msg4 include: enhancing downlink coverage. In weak signal scenarios (such as cell edge and NTN satellite communications), the repeated sending of Msg4 can improve the decoding success rate of user devices, thereby improving the success rate of user devices accessing the network; ensuring the reliability of key signaling, avoiding the random access process falling back to the sending step of Msg1 due to a single transmission failure, thereby reducing access latency.

[0039] In some embodiments, the configuration information includes one or more of the following: a reference signal receiving power threshold; a signal-to-noise ratio threshold; a transmission delay threshold; and a Doppler shift threshold. Furthermore, the configuration information may also include: retransmission strategy indication information, the retransmission strategy indication information specifically being one or more of the maximum number of retransmissions, the retransmission interval (referring to the time interval between two adjacent transmissions of Msg4), and the switch state of whether to allow retransmission in Msg3. If the switch state is "true", it means that requesting retransmission of Msg4 in Msg3 is allowed; if the switch state is "false", it means that requesting retransmission of Msg4 in Msg3 is not allowed. Usually the switch state defaults to "true".

[0040] Exemplarily, the configuration information may be obtained by parsing the "msg4RepetitionConfig" field in SIB1.

[0041] An example of the "msg4RepetitionConfig" field is as follows:

[0042]

[0043] rsrpThreshold represents the reference signal received power threshold, which can be determined through network signal testing. For example, in LEO communication scenarios, rsrpThreshold = -105dBm; in high-speed mobile communication scenarios, rsrpThreshold = -95dBm.

[0044] sinrThreshold represents a signal-to-noise ratio threshold, which can be determined through testing and may also default to sinrThreshold = 3 dB.

[0045] taThreshold represents the transmission delay threshold, which can be determined through testing or the default value can be used. In the terrestrial network communication scenario, taThreshold = 500 μs; in the GEO communication scenario, taThreshold = 100000 μs.

[0046] dopplerThreshold represents the Doppler frequency shift threshold, which can be determined through testing or the default value can be used. In the LEO communication scenario, dopplerThreshold = 10000 Hz; in the high-speed mobile scenario, dopplerThreshold = 5000 Hz.

[0047] maxRepetitions indicates the maximum number of retransmissions, which defaults to 2 and is usually not allowed to exceed 4 to ensure real-time performance.

[0048] repetitionInterval indicates the retransmission interval, which defaults to 4 time slots.

[0049] enableDynamicRequest indicates the Msg4 retransmission switch status and defaults to "true".

[0050] In some embodiments, the configuration information also includes the current communication scenario category, and one or more of the following: retransmission strategy indication information, reference signal received power threshold; signal-to-noise ratio threshold; transmission delay threshold; and Doppler shift threshold. Correspondingly, an example of the "msg4RepetitionConfig" field is as follows:

[0051]

[0052] Among them, "0" means that the current communication scenario category is "terrestrial network communication scenario"; "1"

[0053] Indicates that the current communication scenario category is "LEO communication scenario"; "2" indicates that the current communication scenario category is "GEO communication scenario".

[0054] S220. Determine whether a Msg4 retransmission process needs to be triggered within the current signal coverage range according to the configuration information.

[0055] In some embodiments, the parameter categories corresponding to at least two thresholds included in the configuration information are determined; the parameter values ​​matching the parameter categories are measured in real time; and it is determined whether the Msg4 retransmission process needs to be triggered within the current signal coverage range based on the parameter values ​​and the corresponding thresholds.

[0056] In some embodiments, the configuration information includes a reference signal received power threshold and a Doppler shift threshold, where the two thresholds correspond to parameter categories of reference signal received power and Doppler shift, respectively. The user equipment measures the reference signal received power and Doppler shift values ​​in real time. If the reference signal received power value is less than the reference signal received power threshold and the Doppler shift value is greater than the Doppler shift threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0057] RSRP is used to evaluate the received power and signal strength of the reference signal received from the base station, and is used to measure signal coverage strength (or to determine the quality of the basic link). RSRP ranges from -44dBm to -140dBm, with higher values ​​indicating stronger signals. For example, -54dBm represents a higher signal strength than -64dBm.

[0058] Doppler shift is a frequency change caused by the relative motion between the user device and the base station. In wireless communications, when the user device moves, the signal frequency changes due to the Doppler effect, resulting in Doppler shift. Doppler shift can cause signal distortion and increase the bit error rate, affecting decoding success rates. Adjusting Doppler shift can reduce these problems and improve communication quality.

[0059] In some embodiments, the configuration information includes a signal-to-noise ratio threshold and a transmission delay threshold; the two thresholds correspond to parameter categories of signal-to-noise ratio and transmission delay, respectively. The user equipment measures the signal-to-noise ratio value and the transmission delay value in real time; if the signal-to-noise ratio value is less than the signal-to-noise ratio threshold and the transmission delay value is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0060] The signal-to-noise ratio (SINR) is the ratio of the received useful signal power to the sum of the interference signal power and the noise power. It is used to measure the received signal quality (or to evaluate the impact of interference and noise). The value range is between -23dB and -40dB. A higher value indicates better signal quality. For example, a value of -23dB indicates better signal quality than a value of -29dB.

[0061] The transmission delay (TA) is derived from the RAR in Msg2 and refers to the time the user device needs to send its signal in advance to compensate for the propagation delay experienced during signal transmission. Propagation delay is caused by the time it takes for the signal to propagate from the user device to the base station in the wireless channel. By adjusting the transmission delay, we ensure that all user device signals arrive at the base station at the correct time, thus avoiding signal collisions and interference.

[0062] The above embodiment shows that when determining whether to trigger the Msg4 retransmission process, the decision is made based on a combination of reference signal received power and Doppler shift, or based on a combination of signal-to-noise ratio and transmission delay. In general, if the RSRP is less than a threshold (e.g., -100dBm) and the Doppler shift is greater than a threshold (e.g., 5kHz), Msg4 retransmission is triggered. Alternatively, if the SINR is less than a threshold (e.g., -3dB) and the TA is greater than a threshold (e.g., 500μs), Msg4 retransmission is triggered.

[0063] In other embodiments, a parameter category corresponding to a threshold included in the configuration information is determined; a parameter value matching the parameter category is measured in real time; and based on the parameter value and the corresponding threshold, whether a Msg4 retransmission process needs to be triggered within the current signal coverage range. For example, one of the thresholds included in the configuration information is a reference signal received power threshold, and the corresponding parameter category is reference signal received power. The value of the reference signal received power in the current network environment is measured in real time. If the value is less than the reference signal received power threshold, it is determined that the Msg4 retransmission process needs to be triggered. For another example, one of the thresholds included in the configuration information is a signal-to-noise ratio threshold, and the corresponding parameter category is signal-to-noise ratio. The value of the signal-to-noise ratio in the current network environment is measured in real time. If the value is less than the signal-to-noise ratio threshold, it is determined that the Msg4 retransmission process needs to be triggered. For another example, one of the thresholds included in the configuration information is a transmission delay threshold, and the corresponding parameter category is transmission delay. The value of the transmission delay in the current network environment is measured in real time. If the value is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered. For another example, one of the thresholds included in the configuration information is the Doppler shift threshold, and the corresponding parameter category is Doppler shift. The Doppler shift value in the current network environment is measured in real time. If the value is greater than the Doppler shift threshold, it is determined that the Msg4 retransmission process needs to be triggered.

[0064] In general, the determination can be made based on any one of the reference signal received power, signal-to-noise ratio, transmission delay, and Doppler shift, or a combination of two of them. Alternatively, the determination can be made based on a combination of any three or four of the reference signal received power, signal-to-noise ratio, transmission delay, and Doppler shift.

[0065] For example, if the value of the reference signal received power is less than the reference signal received power threshold, and the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, it is determined that the Msg4 retransmission process is triggered.

[0066] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0067] Alternatively, if the value of the Doppler frequency shift is greater than the Doppler frequency shift threshold, and the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, it is determined that the Msg4 retransmission process is triggered.

[0068] Alternatively, if the value of the Doppler shift is greater than the Doppler shift threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0069] Alternatively, if the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0070] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, the value of the Doppler shift is greater than the Doppler shift threshold, and the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, it is determined that the Msg4 retransmission process is triggered.

[0071] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, the value of the Doppler shift is greater than the Doppler shift threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0072] Alternatively, if the Doppler shift value is greater than the Doppler shift threshold, the signal-to-noise ratio value is less than the signal-to-noise ratio threshold, and the transmission delay value is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0073] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0074] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, the value of the Doppler frequency shift is greater than the Doppler frequency shift threshold, the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0075] Furthermore, in some implementations, whether the Msg4 retransmission process needs to be triggered within the current signal coverage range may be determined in combination with the current communication scenario category.

[0076] For example, according to the current communication scenario category, determine the matching target parameters (specifically, the target parameters matching the current communication scenario category can be determined through a preset mapping relationship); measure the value of the target parameter in real time; determine whether the Msg4 retransmission process needs to be triggered within the current signal coverage range based on the value of the target parameter and the corresponding threshold.

[0077] For example, if the current communication scenario is a LEO satellite communication scenario, the matching target parameter includes Doppler shift, and the Doppler shift value is measured in real time. If the Doppler shift value is greater than the Doppler shift threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range. In other words, if the current communication scenario is a LEO satellite communication scenario, the Doppler shift is the dominant condition (Doppler shift > 10kHz), and the reference signal received power (RSRP) requirement is relaxed.

[0078] If the current communication scenario is a GEO satellite communication scenario, the matching target parameters include transmission delay. The transmission delay value is measured in real time. If the transmission delay value exceeds the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage area. In particular, if the current communication scenario is a GEO satellite communication scenario, a higher transmission delay threshold (TA) is set separately (e.g., 100ms).

[0079] If the current communication scenario category is a terrestrial network communication scenario, the matching target parameters include reference signal received power and Doppler shift; the reference signal received power value and the Doppler shift value are measured in real time. If the reference signal received power value is less than the reference signal received power threshold, and the Doppler shift value is greater than the Doppler shift threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range. Alternatively, if the current communication scenario category is a terrestrial network communication scenario, the matching target parameters include signal-to-noise ratio and transmission delay. The signal-to-noise ratio value and the transmission delay value are measured in real time. If the signal-to-noise ratio value is less than the signal-to-noise ratio threshold, and the transmission delay value is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

[0080] In general, for terrestrial network scenarios, the Doppler shift threshold is lowered to 5kHz, and the RSRP threshold is increased to -95dBm. Alternatively, if the signal-to-noise ratio (SINR) falls below a certain threshold (e.g., -3dB) and the transmission delay (TA) exceeds a certain threshold (e.g., 500μs), a Msg4 retransmission process is triggered.

[0081] In summary, the threshold value used when determining whether the Msg4 retransmission process needs to be triggered in combination with the current communication scenario category is different from the threshold value used in the determination scheme that does not combine the current communication scenario category. The specific value of the threshold can be determined through actual testing or calibration.

[0082] S230 . In response to determining that the Msg4 retransmission process needs to be triggered within the current signal coverage range, a retransmission request message for Msg4 is sent to the base station via Msg3 sent to the base station.

[0083] That is, the retransmission request information of Msg4 is encapsulated into Msg3 and sent to the base station together with Msg3, requesting the base station to repeatedly send Msg4 when sending Msg4, that is, to send Msg4 several times to increase the probability of Msg4 being received and successfully decoded by the user equipment, thereby improving the success rate of the user equipment accessing the network.

[0084] In some embodiments, the communication method further includes: determining whether to add a Doppler frequency shift compensation value in Msg3 according to the current communication scenario category; if it is determined to add a Doppler frequency shift compensation value in Msg3, calculating the Doppler frequency shift compensation value and adding the Doppler frequency shift compensation value in Msg3.

[0085] Specifically, when deciding whether to add the Doppler shift compensation value in Msg3, the decision can be made as follows: If the current communication scenario category is LEO satellite communication or the relative speed between the user equipment and the communication satellite reaches the speed threshold, then it is determined to add the Doppler shift compensation value in Msg3. If the base station pre-corrects the Doppler shift through beamforming or satellite ephemeris, the user equipment does not need to report an additional compensation value.

[0086] In some implementations, if Msg4 is retransmitted due to high Doppler shift, Msg3 needs to carry the Doppler shift compensation value. If Msg4 is retransmitted due to high transmission delay and low reference signal received power, Msg3 does not need to carry the Doppler shift compensation value.

[0087] Exemplarily, when the current communication scenario category is LEO communication, if the value of the Doppler shift is greater than the Doppler shift threshold and the value of the transmission delay is greater than the transmission delay threshold, it is determined that Msg3 needs to further carry the Doppler shift compensation value.

[0088] When the current communication scenario category is GEO communication, if the Doppler shift value is less than the Doppler shift threshold and the transmission delay value is greater than the transmission delay threshold, Msg3 does not need to carry the Doppler shift compensation value.

[0089] In summary, in some embodiments, Msg3 includes retransmission request information for Msg4, and the retransmission request information includes information on whether to request retransmission; when the retransmission request information includes information requesting retransmission, the retransmission request information also includes the number of retransmissions, which is customized or the maximum number of retransmissions indicated in the configuration information, and the Doppler frequency shift compensation value.

[0090] For example, add the following fields to Msg3:

[0091]

[0092]

[0093] Here, requestedRepetitions indicates the recommended number of retransmissions, and dopplerCompensation indicates the Doppler frequency shift compensation value measured by the user equipment.

[0094] S240. Receive Msg4 sent by the base station according to the retransmission request information, and establish a connection with the base station according to the Msg4.

[0095] In some embodiments, before receiving the Msg4 sent by the base station in accordance with the retransmission request information, the method further includes: receiving Msg4 retransmission strategy information sent by the base station, wherein, upon receiving the Msg4 retransmission request information, the base station verifies whether the Msg4 retransmission process needs to be triggered, and based on the verification result, feeds back the Msg4 retransmission strategy information to the user equipment. The Msg4 retransmission strategy information includes the number of retransmissions. In some embodiments, in addition to the number of retransmissions, the Msg4 retransmission strategy information may also include a Doppler shift compensation value to assist the user equipment in correctly decoding the Msg4. Subsequently, the user equipment receives the Msg4 sent by the base station in accordance with the Msg4 retransmission strategy information.

[0096] Optionally, the retransmission strategy information of Msg4 is sent to the user equipment by reusing an existing field or using a reserved field.

[0097] For example, the base station stores the retransmission policy information of Msg4 through an existing field or a reserved field of DCIFormat1_0, thereby achieving the purpose of sending the retransmission policy information of Msg4 to the user equipment.

[0098] An example of DCI Format 1_0 is as follows:

[0099]

[0100]

[0101] Among them, msg4RepetitionControl is used to explicitly indicate the number of retransmissions.

[0102] dopplerPreCompensation is used to indicate the Doppler frequency shift compensation value.

[0103] The user equipment receives the retransmitted copy of Msg4 according to the instructions of the retransmission strategy. In some embodiments, in response to receiving the first Msg4 sent by the base station and decoding it successfully, a response message is fed back to the base station, or a response message and the identifier of the communication beam when the Msg4 is received are fed back to the base station to inform the base station that the Msg4 has been successfully decoded and there is no need to continue to retransmit the Msg4, so that the base station establishes a connection with the user equipment. Alternatively, in response to receiving the first Msg4 sent by the base station and decoding it successfully, no response message is fed back to the base station, and the subsequently received repeated Msg4 is directly discarded. The purpose of this setting is to avoid wasting network resources and save network resources.

[0104] Alternatively, in response to receiving all Msg4s sent by the base station, all Msg4s are decoded and, upon successful decoding, a response message is fed back to the base station. Alternatively, a response message and the identifier of the communication beam at the time the Msg4 was received are fed back to the base station. This setting is intended to ensure reliable reception and decoding of Msg4s and to accommodate unstable communication scenarios such as high frequency shift or high latency.

[0105] If Msg4 decoding fails, no message is fed back to the base station, and the base station triggers a new round of access process through the timeout mechanism.

[0106] Based on the above embodiments, Figure 3 The flow chart of a communication method shown in FIG. 1 is applied to a base station and executed in cooperation with a user equipment. Figure 3 As shown, the following steps are included:

[0107] S310: Send a system information block to user equipment.

[0108] S320: Receive Msg3 sent by the user equipment, determine retransmission strategy information of Msg4 according to the network environment where the user equipment is located, and send the retransmission strategy information of Msg4 to the user equipment.

[0109] In some implementations, when the user equipment UE does not request retransmission, the base station proactively determines whether to retransmit Msg4 according to the network environment where the user equipment is located, and determines the retransmission strategy information of Msg4.

[0110] For example, the base station detects one or more of the values ​​of the reference signal received power, the signal-to-noise ratio, the transmission delay, and the Doppler shift, and compares the detected values ​​with corresponding thresholds to determine whether to retransmit Msg4.

[0111] For example, the base station detects whether the value of the reference signal received power is less than the reference signal received power threshold. If so, it forces retransmission and sends retransmission strategy information to the user equipment according to the retransmission parameters configured in SIB1, and performs retransmission operations according to the retransmission parameters configured in SIB1.

[0112] In some embodiments, the system information block includes configuration information, where the configuration information is used by the user equipment to determine whether a Msg4 retransmission process needs to be triggered within the current signal coverage range. If the user equipment determines that a Msg4 retransmission process needs to be triggered within the current signal coverage range, the user equipment sends a retransmission request message for Msg4 to the base station via Msg3 sent to the base station.

[0113] Correspondingly, the base station determines the retransmission strategy information of Msg4 according to the network environment where the user equipment is located and the retransmission request information carried in Msg3.

[0114] That is, Msg3 includes retransmission request information for Msg4, and the retransmission request information includes information on whether to request retransmission; when the retransmission request information includes information requesting retransmission, the retransmission request information also includes the number of retransmissions, which is customized or the maximum number of retransmissions indicated in the configuration information, and the Doppler frequency shift compensation value.

[0115] Upon receiving Msg3 from the user equipment, the base station determines the final retransmission strategy based on the retransmission request information carried in Msg3. The retransmission strategy includes one or more of the following: a Doppler shift compensation value, the number of Msg4 retransmissions, and a retransmission interval. The base station then sends the Msg4 retransmission strategy to the user equipment, enabling the user equipment to receive and decode Msg4 based on the retransmission strategy.

[0116] In some implementations, the base station parses Msg3 and obtains the retransmission request information carried in Msg3. If the retransmission request information includes a retransmission count, the base station verifies whether the retransmission count is customized by the user equipment or the count indicated in the configuration information. If the retransmission count is customized by the user equipment, the base station verifies whether the customized count is reasonable (usually not allowed to exceed 4). If it is unreasonable, the base station will forcibly change it to avoid excessive retransmission requests from the user equipment. If it is reasonable, the base station will further detect the quality of the current communication channel to determine whether Msg4 really needs to be retransmitted.

[0117] Specifically, the base station measures the uplink reference signal received power value, the transmission delay value, the Doppler frequency shift value, and the signal-to-noise ratio value in real time, and determines whether it is really necessary to retransmit Msg4 in combination with the reference signal received power threshold, the transmission delay threshold, the Doppler frequency shift threshold, and the signal-to-noise ratio threshold indicated in the configuration information. If it is really necessary to retransmit Msg4, the base station further sends the number of retransmissions, the retransmission interval, and the Doppler frequency shift compensation value of Msg4 to the user equipment.

[0118] In some embodiments, as shown in Table 1, the base station refers to the specific value of the msg4RepetitionRequest field of Msg3. If msg4RepetitionRequest=0, it indicates that the user equipment does not request retransmission. If msg4RepetitionRequest=1, it indicates that the user equipment requests retransmission and uses the retransmission number indicated by SIB1. If msg4RepetitionRequest=2, it indicates that the user equipment requests retransmission and customizes the retransmission number. The customized number is determined by the value of the requestedRepetitions field.

[0119] At the same time, the base station refers to the maxRepetitions field in SIB1 to determine the maximum number of retransmissions allowed, and refers to the rsrpThreshold field in SIB1 to determine the reference signal received power threshold, refers to the sinrThreshold field in SIB1 to determine the signal-to-noise ratio threshold, refers to taThreshold to determine the transmission delay threshold, and refers to dopplerThreshold to determine the Doppler frequency shift threshold. These thresholds are used to verify whether retransmission is really required.

[0120] Table 1

[0121]

[0122] Among them, RSRP represents the value of the reference signal received power measured in real time, rsrpThreshold represents the reference signal received power threshold, dopplerThreshold represents the Doppler frequency shift threshold, sinrThreshold represents the signal-to-noise ratio threshold, taThreshold represents the transmission delay threshold, Doppler represents the value of the Doppler frequency shift measured in real time, TA represents the value of the transmission delay measured in real time, and SINR represents the value of the signal-to-noise ratio measured in real time.

[0123] For example, see Figure 4The diagram shows a logic diagram for determining whether retransmission is actually required, specifically including: when the user equipment UE does not request retransmission, determining whether the reference signal received power value is less than the reference signal received power threshold; if so, forcing retransmission, sending a retransmission policy to the user equipment according to the retransmission parameters configured in SIB1, and performing a retransmission operation according to the retransmission parameters configured in SIB1. When the user equipment requests retransmission according to the retransmission parameters configured in SIB1 (i.e., the UE requests default retransmission), if the reference signal received power value is less than the reference signal received power threshold and the Doppler shift value is greater than the Doppler shift threshold, agreeing to retransmission, sending a retransmission policy to the user equipment according to the retransmission parameters configured in SIB1, and performing a retransmission operation according to the retransmission parameters configured in SIB1. In the case where the user equipment customizes the retransmission parameters and requests retransmission (i.e., the UE requests customized retransmission), determine whether the requested number of retransmissions (requestedRepe represents the requested number of retransmissions) is less than the maximum number of retransmissions max. If so, agree to retransmission, and send a retransmission policy to the user equipment according to the retransmission parameters configured by SIB1 or the retransmission parameters customized by the user equipment, and perform the retransmission operation according to the retransmission parameters configured by SIB1 or the retransmission parameters customized by the user equipment.

[0124] The above implementation is only shown as an example. When the base station determines whether retransmission is really needed, it can still make a determination based on any one, any two, any three or a combination of four of the reference signal received power, signal-to-noise ratio, transmission delay and Doppler frequency shift.

[0125] For example, if the value of the reference signal received power is less than the reference signal received power threshold, and the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, it is determined that retransmission is required.

[0126] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that retransmission is required.

[0127] Alternatively, if the value of the Doppler frequency shift is greater than the Doppler frequency shift threshold, and the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, it is determined that retransmission is required.

[0128] Alternatively, if the value of the Doppler frequency shift is greater than the Doppler frequency shift threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that retransmission is required.

[0129] Alternatively, if the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that retransmission is required.

[0130] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, the value of the Doppler shift is greater than the Doppler shift threshold, and the value of the signal to noise ratio is less than the signal to noise ratio threshold, it is determined that retransmission is required.

[0131] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, the value of the Doppler shift is greater than the Doppler shift threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that retransmission is required.

[0132] Alternatively, if the value of the Doppler shift is greater than the Doppler shift threshold, the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that retransmission is required.

[0133] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that retransmission is required.

[0134] Alternatively, if the value of the reference signal received power is less than the reference signal received power threshold, the value of the Doppler shift is greater than the Doppler shift threshold, the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that retransmission is required.

[0135] In summary, determine the retransmission strategy information for Msg4, including:

[0136] If Msg3 includes the retransmission request information of Msg4, the retransmission request information is verified and the retransmission strategy information of Msg4 is determined based on the verification result; if Msg3 does not include the retransmission request information of Msg4, a check is made based on the parameter values ​​measured in real time and the configuration information to determine whether the retransmission process of Msg4 needs to be triggered. If so, the retransmission interval and number of retransmissions indicated by the configuration information are determined as the retransmission strategy information of Msg4.

[0137] The retransmission request information is verified, and the retransmission strategy information of Msg4 is determined based on the verification result, including: if the retransmission request information is determined based on the configuration information, then checking whether it is necessary to trigger the retransmission process of Msg4 based on the parameter values ​​measured in real time and the configuration information; if so, determining the retransmission interval and the number of retransmissions indicated by the configuration information as the retransmission strategy information of Msg4; if the retransmission request information is not determined based on the configuration information, determining whether the number of retransmissions requested in the retransmission request information is less than the maximum number indicated by the configuration information; if so, determining the retransmission interval indicated by the configuration information and the number of retransmissions requested by the retransmission request information as the retransmission strategy information of Msg4.

[0138] Checking whether a retransmission process of Msg4 needs to be triggered based on parameter values ​​measured in real time and configuration information includes: determining a parameter category corresponding to at least one threshold value included in the configuration information; measuring parameter values ​​matching the parameter category in real time; and checking whether a retransmission process of Msg4 needs to be triggered based on the parameter values ​​and the corresponding threshold values. The parameter values ​​include one or more of a reference signal received power value, a Doppler frequency shift value, a transmission delay value, and a signal-to-noise ratio value.

[0139] For example, if the user equipment does not request retransmission, and the base station determines through detection that the reference signal received power value is less than the reference signal received power threshold indicated in the configuration information, a retransmission may be forced to cover weak network scenarios and improve the user equipment's success rate in accessing the network. Alternatively, if the Doppler shift value is greater than the Doppler shift threshold, a retransmission may be forced to cover LEO satellite high-frequency shift scenarios. Alternatively, if the transmission delay is greater than the transmission delay threshold, a retransmission may be forced to cover high-latency scenarios.

[0140] S330: Send Msg4 to the user equipment according to the retransmission strategy information, and establish a connection with the user equipment upon receiving a response message indicating successful decoding of Msg4 fed back by the user equipment.

[0141] In particular, the purpose of Doppler shift adjustment is to compensate for frequency deviations caused by the Doppler effect and other factors (such as clock deviation) to ensure the stability and reliability of communications. Specific purposes include: Improving communication quality: Doppler shift can cause signal distortion and increased bit error rate. By adjusting the Doppler shift, these problems can be reduced and communication quality can be improved. Maintaining synchronization: In wireless communication systems, the transmitter and receiver need to maintain frequency synchronization, otherwise it will affect demodulation and data recovery. Doppler shift adjustment helps maintain this synchronization. Reducing interference: Doppler shift may cause interference between adjacent channels. Adjustment can reduce this interference and optimize spectrum usage. Supporting high-speed mobility: In high-speed mobility scenarios (such as vehicles or trains), Doppler shift is more obvious. Doppler shift adjustment can ensure stable communication in such situations.

[0142] As shown in Table 2, Doppler shift compensation is required in LEO satellite communication scenarios and when user equipment is moving at high speeds. This is because the frequency shift far exceeds the capability of the physical layer's automatic Doppler shift correction (AFC), which typically corrects Doppler shifts within ±1 kHz. Furthermore, failure to perform compensation can lead to Msg4PDSCH demodulation failure, which may not be recoverable even with retransmissions.

[0143] Table 2

[0144]

[0145] As shown in Table 3, scenarios where Msg4 retransmission is required but Doppler shift compensation is not required include GEO satellite communication scenarios where the transmission delay is greater than the transmission delay threshold; scenarios where the signal-to-noise ratio is less than the signal-to-noise ratio threshold, such as high-interference scenarios such as dense urban areas; and scenarios where the reference signal received power is less than the threshold, such as shadow-obstructed scenarios.

[0146] Table 3

[0147]

[0148] Doppler shift compensation can solve the problem of signal waveform distortion, and Msg4 retransmission can solve the problem of decoding failure.

[0149] General, reference Figure 5 The diagram shows an interaction between a user equipment (UE) and a base station, specifically including: when the base station sends SIB1 to the user equipment, it adds configuration information to the SIB1, including: reference signal received power threshold, signal-to-noise ratio threshold, transmission delay threshold, and Doppler shift threshold, providing a basis for the user equipment to decide whether to initiate Msg4 retransmission; and, when necessary, adds a Doppler shift compensation value. The configuration information may also include retransmission policy indication information, including the maximum number of retransmissions, the retransmission interval, and the switch status of whether to allow retransmission requests in Msg3.

[0150] The UE parses SIB1, obtains the configuration information, determines whether the current network environment requires a retransmission of Msg4, and calculates whether the Doppler shift compensation value needs to be reported. If a retransmission is required, the UE adds the retransmission request and Doppler shift compensation value to Msg3 and sends it to the base station.

[0151] The base station parses Msg3 to obtain the retransmission request information, verifies whether retransmission is really required, and sends the final retransmission strategy information to the user equipment through DCI Format1_0, and sends the Doppler frequency shift compensation value when necessary.

[0152] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 6 As shown, the electronic device 500 includes one or more processors 501 and a memory 502 .

[0153] The processor 501 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 500 to perform desired functions.

[0154] The memory 502 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may, for example, include read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 501 may run the program instructions to implement the communication method of any embodiment of the present application described above and / or other desired functions. Various contents such as initial external parameters, thresholds, etc. may also be stored in the computer-readable storage medium.

[0155] In one example, the electronic device 500 may further include an input device 503 and an output device 504, which are interconnected via a bus system and / or other connection mechanisms (not shown). The input device 503 may include, for example, a keyboard, a mouse, etc. The output device 504 may output various information to the outside, including warning information, braking force, etc. The output device 504 may include, for example, a display, a speaker, a printer, a communication network, and remote output devices connected thereto.

[0156] Of course, to simplify, Figure 6 Only some of the components related to the present application in the electronic device 500 are shown, and components such as buses, input / output interfaces, etc. are omitted. In addition, the electronic device 500 may further include any other appropriate components according to specific application scenarios.

[0157] In addition to the above-mentioned methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the communication method provided by any embodiment of the present application.

[0158] The computer program product may be written in any combination of one or more programming languages ​​to implement the program code for performing the operations of the embodiments of the present application, including object-oriented programming languages ​​such as Java, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0159] In addition, an embodiment of the present application may also be a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, causes the processor to execute the steps of the communication method provided by any embodiment of the present application.

[0160] The computer-readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to a system, device or component of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0161] It should be noted that the terms used in this application are only for describing specific embodiments and are not intended to limit the scope of this application. As shown in the specification and claims of this application, unless the context clearly indicates an exception, the words "one", "an", "a kind of" and / or "the" do not specifically refer to the singular and may also include the plural. The terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method or device. In the absence of further restrictions, the elements defined by the sentence "comprise a..." do not exclude the presence of other identical elements in the process, method or device comprising the elements.

[0162] It should also be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0163] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can also make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A communication method, applied to a user equipment, characterized in that: include: In response to receiving a system information block sent by a base station, determining configuration information from the system information block; Determine whether a Msg4 retransmission process needs to be triggered within the current signal coverage range according to the configuration information; In response to determining that a Msg4 retransmission process needs to be triggered within the current signal coverage range, sending retransmission request information for Msg4 to the base station via Msg3 sent to the base station; Receive Msg4 sent by the base station according to the retransmission request information, and establish a connection with the base station according to the Msg4.

2. The method according to claim 1, characterized in that The configuration information includes one or more of the following: Reference signal receiving power threshold; signal-to-noise ratio threshold; Transmission delay threshold; Doppler shift threshold.

3. The method according to claim 2, characterized in that The determining, according to the configuration information, whether it is necessary to trigger the Msg4 retransmission process within the current signal coverage range includes: Determining parameter categories corresponding to at least two thresholds included in the configuration information; measuring parameter values ​​matching the parameter categories in real time; Determine whether the Msg4 retransmission process needs to be triggered within the current signal coverage range according to the parameter value and the corresponding threshold in the configuration information.

4. The method according to claim 3, characterized in that The configuration information includes a reference signal received power threshold and a Doppler frequency shift threshold; The parameter values ​​include a value of a reference signal received power and a value of a Doppler frequency shift; The determining, according to the parameter value and the corresponding threshold in the configuration information, whether it is necessary to trigger the Msg4 retransmission process within the current signal coverage range includes: If the value of the reference signal received power is less than the reference signal received power threshold, and the value of the Doppler shift is greater than the Doppler shift threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

5. The method according to claim 3, characterized in that The configuration information includes a signal-to-noise ratio threshold and a transmission delay threshold; The parameter values ​​include a signal-to-noise ratio value and a transmission delay value; The determining, according to the parameter value and the corresponding threshold in the configuration information, whether it is necessary to trigger the Msg4 retransmission process within the current signal coverage range includes: If the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

6. The method according to claim 2, characterized in that The configuration information also includes the current communication scenario category; The determining, according to the configuration information, whether it is necessary to trigger the Msg4 retransmission process within the current signal coverage range includes: Determining matching target parameters according to the current communication scenario category; measuring the value of the target parameter in real time; Determine whether the Msg4 retransmission process needs to be triggered within the current signal coverage range according to the value of the target parameter and the corresponding threshold in the configuration information.

7. The method according to claim 6, characterized in that The current communication scenario category includes a LEO satellite communication scenario, and the matching target parameter includes a Doppler frequency shift; The determining, according to the value of the target parameter and the corresponding threshold in the configuration information, whether it is necessary to trigger the Msg4 retransmission process within the current signal coverage range includes: If the value of the Doppler frequency shift is greater than the Doppler frequency shift threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

8. The method according to claim 6, characterized in that The current communication scenario category includes a GEO satellite communication scenario, and the matching target parameter includes a transmission delay; The determining, according to the value of the target parameter and the corresponding threshold in the configuration information, whether it is necessary to trigger the Msg4 retransmission process within the current signal coverage range includes: If the value of the transmission delay is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

9. The method according to claim 6, characterized in that The current communication scenario category includes a terrestrial network communication scenario, and the matching target parameters include reference signal received power and Doppler shift; The determining, according to the value of the target parameter and the corresponding threshold in the configuration information, whether it is necessary to trigger the Msg4 retransmission process within the current signal coverage range includes: If the value of the reference signal received power is less than the reference signal received power threshold, and the value of the Doppler shift is greater than the Doppler shift threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

10. The method according to claim 6, characterized in that The current communication scenario category includes a terrestrial network communication scenario, and the matching target parameters include a signal-to-noise ratio and a transmission delay; The determining, according to the value of the target parameter and the corresponding threshold in the configuration information, whether it is necessary to trigger the Msg4 retransmission process within the current signal coverage range includes: If the value of the signal-to-noise ratio is less than the signal-to-noise ratio threshold, and the value of the transmission delay is greater than the transmission delay threshold, it is determined that the Msg4 retransmission process needs to be triggered within the current signal coverage range.

11. The method according to claim 6, characterized in that Also includes: Determining whether to add a Doppler shift compensation value to the Msg3 according to the current communication scenario category; If it is determined to add the Doppler frequency shift compensation value in the Msg3, the Doppler frequency shift compensation value is added in the Msg3.

12. The method according to claim 11, characterized in that The determining, according to the current communication scenario category, whether to add a Doppler shift compensation value in the Msg3 includes: If the current communication scenario category is LEO satellite communication or the relative speed between the user equipment and the communication satellite reaches a speed threshold, it is determined to add a Doppler shift compensation value in the Msg3.

13. The method according to claim 2, characterized in that The configuration information also includes retransmission strategy indication information, and the retransmission strategy indication information includes one or more of the maximum number of retransmissions, the retransmission interval, and the switch state of whether to allow retransmission request in Msg3.

14. The method according to claim 1, wherein The Msg3 includes retransmission request information for Msg4, and the retransmission request information includes information on whether to request retransmission; In the case where the retransmission request information includes information requesting retransmission, the retransmission request information also includes a number of retransmissions, which is a user-defined number or a maximum number of retransmissions indicated in the configuration information.

15. The method according to claim 1, wherein The receiving the Msg4 sent by the base station according to the retransmission request information, and establishing a connection with the base station according to the Msg4, includes: In response to receiving the first Msg4 sent by the base station and successfully decoding it, feeding back a response message to the base station, or feeding back a response message and an identifier of the communication beam when Msg4 was received to the base station, so as to inform the base station that Msg4 has been successfully decoded and there is no need to continue to resend Msg4, so that the base station establishes a connection with the user equipment; Alternatively, in response to receiving all Msg4s sent by the base station, all Msg4s are decoded, and when decoding is successful, the response message is fed back to the base station, or the response message and the identifier of the communication beam when the Msg4 is received are fed back to the base station.

16. The method according to claim 1, wherein Before the receiving of the Msg4 sent by the base station according to the retransmission request information and establishing a connection with the base station according to the Msg4, the method further includes: Receive the Msg4 retransmission strategy information sent by the base station, wherein, when receiving the Msg4 retransmission request information, the base station checks whether the Msg4 retransmission process needs to be triggered, and feeds back the Msg4 retransmission strategy information to the user equipment based on the verification result.

17. A communication method, applied to a base station, characterized in that: include: Sending a system information block to a user equipment; Receive Msg3 sent by the user equipment, determine the retransmission strategy information of Msg4 according to the network environment where the user equipment is located, and send the retransmission strategy information of Msg4 to the user equipment; And, sending Msg4 to the user equipment according to the retransmission strategy information, and establishing a connection with the user equipment upon receiving a response message indicating successful decoding of Msg4 fed back by the user equipment.

18. The method according to claim 17, characterized in that The system information block includes configuration information, where the configuration information is used by the user equipment to determine whether a Msg4 retransmission process needs to be triggered within the current signal coverage range. If the user equipment determines that a Msg4 retransmission process needs to be triggered within the current signal coverage range, the user equipment sends a retransmission request message for Msg4 to the base station via Msg3 sent to the base station. Correspondingly, determining the retransmission strategy information of Msg4 according to the network environment where the user equipment is located includes: The retransmission strategy information of Msg4 is determined according to the network environment where the user equipment is located and the retransmission request information carried in Msg3.

19. The method according to claim 18, characterized in that The receiving of Msg3 sent by the user equipment and determining the retransmission strategy information of Msg4 includes: If the Msg3 includes the retransmission request information of Msg4, verify the retransmission request information and determine the retransmission strategy information of Msg4 according to the verification result; If the Msg3 does not include the retransmission request information of Msg4, check whether the retransmission process of Msg4 needs to be triggered based on the real-time measured parameter value and the configuration information. If so, determine the retransmission interval and number of retransmissions indicated by the configuration information as the retransmission strategy information of Msg4.

20. The method according to claim 19, characterized in that The verifying the retransmission request information and determining the retransmission strategy information of Msg4 according to the verification result includes: If the retransmission request information is determined according to the configuration information, checking whether it is necessary to trigger the retransmission process of Msg4 based on the parameter value measured in real time and the configuration information; if so, determining the retransmission interval and the number of retransmissions indicated by the configuration information as the retransmission strategy information of Msg4; If the retransmission request information is not determined based on the configuration information, determine whether the number of retransmissions requested in the retransmission request information is less than the maximum number indicated by the configuration information. If so, determine the retransmission interval indicated by the configuration information and the number of retransmissions requested by the retransmission request information as the retransmission strategy information of Msg4.

21. The method according to claim 19 or 20, characterized in that The process of checking whether it is necessary to trigger the retransmission of Msg4 according to the parameter value measured in real time and the configuration information includes: Determining parameter categories corresponding to at least two thresholds included in the configuration information; measuring parameter values ​​matching the parameter categories in real time; Whether the retransmission process of Msg4 needs to be triggered is checked according to the parameter value and the corresponding threshold.

22. The method according to claim 19 or 20, characterized in that The parameter value includes one or more of a value of a reference signal received power, a value of a Doppler frequency shift, a value of a transmission delay, and a value of a signal-to-noise ratio.

23. The method according to claim 17, wherein The retransmission strategy information includes one or more of a Doppler frequency shift compensation value, the number of retransmissions of Msg4, and a retransmission interval.

24. The method according to claim 17, wherein The sending the retransmission strategy information of Msg4 to the user equipment includes: The retransmission strategy information of Msg4 is sent to the user equipment by reusing an existing field or using a reserved field.

25. An electronic device, characterized in that: The electronic device comprises: processor and memory; The processor is configured to execute the steps of the communication method according to any one of claims 1 to 24 by calling the program or instructions stored in the memory.

26. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a program or instructions, which causes a computer to execute the steps of the communication method according to any one of claims 1 to 24.

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