Random access method and apparatus, storage medium

Abstract

The present disclosure provides a random access method and device, and a storage medium, wherein the method comprises: in response to having sent a physical random access channel (PRACH) to a base station and not receiving a random access message sent by the base station, determining to perform PRACH retransmission; determining a target repetition transmission number of repeatedly sending the PRACH when performing the PRACH retransmission; and performing the PRACH retransmission based on the target repetition transmission number. The present disclosure clearly defines the terminal behavior of the terminal when initiating random access, improves the success rate of random access, and has high availability.

Description

Technical Field

[0001] This disclosure relates to the field of communications, and in particular to random access methods and apparatus, and storage media. Background Technology

[0002] The retransmission mechanism for the Physical Random Access Channel (PRACH) was discussed in Release 16 (R16) and Release 17 (R17). However, in Release 18, the existing PRACH retransmission mechanism may no longer be applicable. Summary of the Invention

[0003] To overcome the problems existing in related technologies, embodiments of this disclosure provide a random access method and apparatus, and a storage medium.

[0004] According to a first aspect of the present disclosure, a random access method is provided, the method being executed by a terminal, comprising:

[0005] In response to having sent a Physical Random Access Channel (PRACH) to the base station but not receiving a random access message from the base station, it is determined to retransmit the PRACH.

[0006] Determine the target number of retransmissions of PRACH when performing PRACH retransmission;

[0007] Based on the target number of repeated transmissions, PRACH retransmission is performed.

[0008] Optionally, determining the target number of retransmissions of PRACH when performing PRACH retransmission includes:

[0009] The target number of repeated transmissions is determined based on the initial number of repeated transmissions; wherein, the initial number of repeated transmissions is the number of repeated transmissions of the PRACH determined when the terminal first sends the PRACH to the base station.

[0010] Optionally, the method further includes:

[0011] Before sending PRACH to the base station for the first time, the reference signal received power RSRP of the synchronization signal is measured to obtain a first measurement value;

[0012] Among one or more preset RSRP thresholds, the first RSRP threshold that is greater than the first measured value and has the smallest difference from the first measured value is determined;

[0013] Based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the first RSRP threshold is determined as the initial number of repeated transmissions.

[0014] Optionally, determining the target number of retransmissions of PRACH when performing PRACH retransmission includes:

[0015] The target number of repeated transmissions is determined to be equal to the initial number of repeated transmissions.

[0016] Optionally, determining the target number of repeated transmissions based on the initial number of repeated transmissions includes:

[0017] Determine a first number of repeated transmissions that is greater than the initial number of repeated transmissions;

[0018] The number of target repeated transmissions is determined to be equal to the number of first repeated transmissions.

[0019] Optionally, determining the target number of repeated transmissions based on the initial number of repeated transmissions includes:

[0020] If message 2 sent by the base station is not received, a second number of repeated transmissions greater than the initial number of repeated transmissions is determined;

[0021] The target number of repeated transmissions is determined to be equal to the second number of repeated transmissions.

[0022] Optionally, the method further includes:

[0023] Based on the target number of repeated transmissions, the transmission power is determined when performing PRACH retransmission.

[0024] Optionally, determining the transmission power for PRACH retransmission based on the target number of repeated transmissions includes:

[0025] When the target number of repeated transmissions is equal to the initial number of repeated transmissions, power boosting is determined during PRACH retransmission;

[0026] When the target number of repeated transmissions is greater than the initial number of repeated transmissions, it is determined that no power boosting will be performed during PRACH retransmission.

[0027] Optionally, the method further includes:

[0028] Determine the target resource to use when performing PRACH retransmission.

[0029] Optionally, determining the target resource used when performing PRACH retransmission includes:

[0030] When the target number of retransmissions is equal to the initial number of retransmissions, it is determined that the target resource used for PRACH retransmission is a resource in the first resource group; wherein, the first resource group is a resource group associated with the initial number of retransmissions among a plurality of resource groups pre-allocated to the terminal.

[0031] Optionally, the method further includes:

[0032] When the target number of repeated transmissions is greater than the initial number of repeated transmissions, a second resource group associated with the target number of repeated transmissions is determined from among the multiple resource groups pre-allocated to the terminal;

[0033] The determination of the target resources used when performing PRACH retransmission includes:

[0034] The target resource used for PRACH retransmission is determined to be a resource in the second resource group.

[0035] Optionally, the method further includes:

[0036] The RSRP of the synchronization signal is measured to obtain the second measurement value;

[0037] Among one or more preset RSRP thresholds, the second RSRP threshold that is greater than the second measured value and has the smallest difference from the second measured value is determined;

[0038] Determining the target number of PRACH retransmissions during PRACH retransmission includes:

[0039] Based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the second RSRP threshold is determined as the target number of repeated transmissions.

[0040] Optionally, the method further includes:

[0041] Based on the target number of repeated transmissions, the transmission power is determined when performing PRACH retransmission.

[0042] Optionally, determining the transmission power for PRACH retransmission based on the target number of repeated transmissions includes:

[0043] When performing RACH retransmission based on the target number of retransmissions, it is determined that no power boosting will be performed during RACH retransmission; or

[0044] In response to determining that the target retransmission count is different from the third retransmission count of the previous retransmission of PRACH, it is determined that no power boosting will be performed during PRACH retransmission.

[0045] Optionally, the method further includes:

[0046] Determine the target resource to use when performing PRACH retransmission.

[0047] Optionally, the method further includes:

[0048] Among the multiple resource groups pre-allocated to the terminal, a second resource group associated with the target number of repeated transmissions is determined;

[0049] The determination of the target resources used when performing PRACH retransmission includes:

[0050] The target resource used for PRACH retransmission is determined to be a resource in the second resource group.

[0051] According to a second aspect of the present disclosure, a random access device is provided, the device being applied to a terminal, comprising:

[0052] The first determining module is configured to determine to retransmit the Physical Random Access Channel (PRACH) in response to having sent the PRACH to the base station but not receiving a random access message from the base station.

[0053] The second determining module is configured to determine the target number of repeated transmissions of PRACH when performing PRACH retransmission.

[0054] The transmission module is configured to perform PRACH retransmission based on the target repeated transmission number.

[0055] According to a third aspect of the present disclosure, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the random access method described in any of the preceding claims.

[0056] According to a fourth aspect of the present disclosure, a random access device is provided, comprising:

[0057] processor;

[0058] Memory used to store processor-executable instructions;

[0059] The processor is configured to execute the random access method described in any of the preceding claims.

[0060] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0061] In this embodiment, if a terminal has already sent a PRACH to the base station but has not received a random access message from the base station, it can determine to retransmit the PRACH. The terminal can then determine the target number of times to retransmit the PRACH and perform the retransmission based on that target number. This disclosure clarifies the terminal behavior when initiating random access, improving the success rate and availability of random access.

[0062] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0063] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0064] Figure 1a This is a schematic diagram illustrating a random access method according to an exemplary embodiment.

[0065] Figure 1b This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0066] Figure 2a This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0067] Figure 2b This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0068] Figure 3a This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0069] Figure 3b This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0070] Figure 4a This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0071] Figure 4b This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0072] Figure 5 This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0073] Figure 6 This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0074] Figure 7 This is a schematic diagram of another random access method flow according to an exemplary embodiment.

[0075] Figure 8 This is a block diagram of a random access device according to an exemplary embodiment.

[0076] Figure 9 This is a schematic diagram of a random access device according to an exemplary embodiment of the present disclosure. Detailed Implementation

[0077] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0078] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of at least one associated listed item.

[0079] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0080] The PRACH retransmission mechanism in R16 is as follows:

[0081] The base station can configure the maximum number of preamble retransmissions in the Physical Random Access Channel (PRACH) resource configuration of System Information Block 1 (SIB1) or Radio Resource Control (RRC) messages, with the following possible values:

[0082] preambleTransMax ENUMERATED{n3, n4, n5, n6, n7, n8, n10, n20, n50, n100, n200}

[0083] Furthermore, if the terminal fails to receive message 2 (msg2) or message 4 (msg4), it will retransmit the PRACH until the maximum number of retransmissions mentioned above is reached, at which point the RACH will be declared a failure.

[0084] In addition, Release 16 (R16) specifies a fallback mechanism for transitioning from two-step random access (2-step RACH) to four-step random access (4-step RACH):

[0085] For R16 2-step RACH, once an end selects to initiate 2-step RACH, it will always use separate resources for PRACH transmission until the maximum number of retransmissions is reached;

[0086] If the base station is configured with a maximum number of retransmissions for message A (msgA-TransMax), after the 2-step RACH reaches the maximum number of retransmissions, it can fall back to the 4-step RACH.

[0087] In R17, repetition of message 3 was introduced, with the following mechanism:

[0088] In Release 17 (R17), before initiating a RACH, the terminal compares the measured Synchronization Signal-Reference Receiving Power (SS-RSRP) with at least one threshold to determine whether to initiate a msg3 repetition request. If a msg3 repetition request is initiated, for both initial and retransmission PRACH, resources are always selected from separate PRACH resources for PRACH transmission until the maximum number of retransmissions is reached.

[0089] In R18, the above mechanisms may no longer be applicable, resulting in unclear terminal behavior during random access and a low success rate of random access.

[0090] To address the aforementioned technical issues, this disclosure provides the following random access method.

[0091] The random access method provided in this disclosure will now be introduced from the perspective of the terminal side.

[0092] This disclosure provides a random access method, referring to... Figure 1a and Figure 1b As shown, Figure 1a and Figure 1b This is a flowchart illustrating a random access method according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0093] In step 101, in response to having sent the Physical Random Access Channel (PRACH) to the base station but not receiving a random access message from the base station, it is determined to retransmit the PRACH.

[0094] In this embodiment of the disclosure, not receiving a random access message sent by the base station may refer to not receiving msg2 or msg4 sent by the base station, or it may refer to not receiving message B (msgB) sent by the base station.

[0095] In this embodiment of the disclosure, PRACH retransmission means that the terminal does not need to wait until the entire random access process is completed and the random access process is determined to have failed before sending PRACH. Instead, the terminal can retransmit PRACH to the base station even if it has already sent PRACH to the base station and has not received the corresponding msg2, msg4 or msgB returned by the base station.

[0096] In step 102, the target number of repeated transmissions of PRACH is determined when performing the PRACH retransmission.

[0097] It should be noted that step 102 can be executed either before or during the PRACH process. That is, it can be performed as follows: Figure 1a As shown, first execute step 101, then execute step 102; or as shown... Figure 1b As shown, step 102 is executed first, followed by step 101.

[0098] In this embodiment of the disclosure, PRACH repetition refers to repeatedly sending the same PRACH, which improves uplink transmission reliability and random access success rate.

[0099] It is understandable that the preamble carried by the PRACH is the same when the PRACH is transmitted repeatedly, that is, the PRACH transmitted repeatedly is the same.

[0100] In step 103, PRACH retransmission is performed based on the target number of repeated transmissions.

[0101] In this embodiment of the disclosure, the target repeated transmission number can be a non-zero positive integer, such as 1, 2, ...

[0102] If the target retransmission count is 1, the terminal will not retransmit the PRACH when initiating a PRACH retransmission.

[0103] If the target retransmission count is greater than 1, the terminal will retransmit the PRACH when initiating a PRACH retransmission, and the number of retransmissions will be equal to the target retransmission count.

[0104] The above embodiments clarify the terminal behavior when initiating random access, thereby improving the success rate of random access and increasing availability.

[0105] In some alternative embodiments, the terminal may determine the target number of repeated transmissions using, but is not limited to, any of the following methods:

[0106] Method 1: Based on the strategy when initiating the initial PRACH, determine the strategy for PARCH retransmission. The strategy for PARCH retransmission includes, but is not limited to, the target repeated transmission count.

[0107] Reference Figure 2a and Figure 2b As shown, Figure 2a and Figure 2b This is a flowchart illustrating a random access method according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0108] In step 201, in response to having sent the Physical Random Access Channel (PRACH) to the base station but not receiving a random access message from the base station, it is determined to retransmit the PRACH.

[0109] In this embodiment of the disclosure, not receiving a random access message sent by the base station may refer to not receiving msg2 or msg4 sent by the base station, or it may refer to not receiving message B (msgB) sent by the base station.

[0110] In this embodiment of the disclosure, PRACH retransmission means that the terminal does not need to wait until the entire random access process is completed and the random access process is determined to have failed before sending PRACH. Instead, the terminal can retransmit PRACH to the base station even if it has already sent PRACH to the base station and has not received the corresponding msg2, msg4 or msgB returned by the base station.

[0111] In step 202, based on the initial number of repeated transmissions, the target number of repeated transmissions of PRACH is determined when performing the PRACH retransmission.

[0112] It should be noted that step 202 can be executed either before or during the PRACH process. That is, it can be performed as follows: Figure 2aAs shown, first execute step 201, then execute step 202; or as shown... Figure 2b As shown, step 202 is executed first, followed by step 201.

[0113] In this embodiment of the disclosure, the initial number of repeated transmissions may be the number of repeated transmissions of the PRACH determined when the terminal first sends the PRACH to the base station during the random access process.

[0114] In one possible implementation, the terminal determines the initial number of repeated transmissions in the following way:

[0115] First, before the terminal sends PRACH to the base station for the first time, the reference signal received power (SS-RSRP) of the synchronization signal is measured to obtain a first measurement value.

[0116] Furthermore, the terminal determines the first RSRP threshold that is greater than the first measured value and has the smallest difference from the first measured value among one or more preset RSRP thresholds.

[0117] For example, multiple preset thresholds include threshold #1, threshold #2, and threshold #3, where threshold #2 and threshold #3 are both greater than the first measured value. If the difference between threshold #2 and the first measured value is less than the difference between threshold #3 and the first measured value, then the terminal determines threshold #2 as the first RSRP threshold.

[0118] Furthermore, based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the first RSRP threshold is determined as the initial number of repeated transmissions.

[0119] For example, if the preset number of repeated transmissions corresponding to threshold #1 is 8, the preset number of repeated transmissions corresponding to threshold #2 is 4, the preset number of repeated transmissions corresponding to threshold #3 is 2, and the first RSRP threshold is threshold #2, then the terminal determines the initial number of repeated transmissions to be 4.

[0120] In one possible implementation, the terminal can directly determine the initial number of repeated transmissions as the target number of repeated transmissions. For example, if the initial number of repeated transmissions is 4, then the target number of repeated transmissions is also 4. In another possible implementation, the terminal can determine a first number of repeated transmissions greater than the initial number of repeated transmissions, and determine the first number of repeated transmissions as the target number of repeated transmissions.

[0121] Specifically, the methods for determining the target repeated transmission count can include the following examples:

[0122] In one possible example, the first number of repeated transmissions can be a positive integer greater than the initial number of repeated transmissions.

[0123] For example, if the initial number of repeated transmissions is 4 and the first number of repeated transmissions is 6, then the terminal can determine that the target number of repeated transmissions is 6.

[0124] In another possible example, the first number of repeat transmissions can be a multiple of the initial number of repeat transmissions.

[0125] For example, the first repeated transmission count = initial repeated transmission count × alpha, where alpha is a positive integer greater than 1. For example, if the initial repeated transmission count is 4 and alpha is 2, the first repeated transmission count is 4 × 2 = 8, then the terminal can determine that the target repeated transmission count is 8.

[0126] In the embodiments disclosed herein, alpha may be indicated by the base station or may be agreed upon by the protocol, and this disclosure does not limit this.

[0127] In another possible implementation, when the terminal does not receive message 2 from the base station, it determines a second retransmission number greater than the initial retransmission number. This second retransmission number may or may not be equal to the previous first retransmission number; this disclosure does not limit this. Further, the terminal determines the second retransmission number as the target retransmission number. In one possible example, the second retransmission number can be a positive integer greater than the initial retransmission number. For example, if the initial retransmission number is 4 and the second retransmission number is 6, then the terminal can determine the target retransmission number to be 6.

[0128] In another possible example, the second number of repeated transmissions can be a multiple of the initial number of repeated transmissions. For example, the second number of repeated transmissions = the initial number of repeated transmissions × beta, where beta is a positive integer greater than 1. For instance, if the initial number of repeated transmissions is 4 and beta is 3, the second number of repeated transmissions is 4 × 3 = 12, then the terminal can determine the target number of repeated transmissions to be 12. In embodiments of this disclosure, beta can be indicated by the base station or agreed upon by the protocol; this disclosure does not limit this.

[0129] In another possible implementation, the terminal can determine the third retransmission number during the PRACH process and use this third retransmission number as the target retransmission number. During the PRACH process, the terminal determines the third retransmission number based on the reference signal received power (SS-RSRP) of the synchronization signal.

[0130] For example, during the PRACH process, the terminal can remeasure the SS-RSRP to obtain a second SS-RSRP measurement value, and compare the second measurement value with one or more preset RSRP thresholds to determine the first RSRP threshold that is greater than the first measurement value and has the smallest difference from the first measurement value. Then, based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the first RSRP threshold is determined as the third number of repeated transmissions. Alternatively, the terminal can determine the initial number of repeated transmissions as the third number of repeated transmissions.

[0131] For example, if the terminal has an SS-RSRP measurement window during the PRACH process, it can remeasure SS-RSRP within that window to obtain a second SS-RSRP measurement value. This second value is then compared with one or more preset RSRP thresholds to determine the first RSRP threshold that is greater than the first measurement value and has the smallest difference from it. Next, based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the first RSRP threshold is determined as the third number of repeated transmissions. If the terminal does not have an SS-RSRP measurement window during the PRACH process, the initial number of repeated transmissions is used to determine the third number of repeated transmissions. Of course, this is just an example and not the only way to determine the third number of repeated transmissions.

[0132] In step 203, PRACH retransmission is performed based on the target number of repeated transmissions.

[0133] In this embodiment of the disclosure, the target repeated transmission number can be a non-zero positive integer, such as 1, 2, ...

[0134] If the target retransmission count is 1, the terminal will not retransmit the PRACH when initiating a PRACH retransmission.

[0135] If the target retransmission count is greater than 1, the terminal will retransmit the PRACH when initiating a PRACH retransmission, and the number of retransmissions will be equal to the target retransmission count.

[0136] In the above embodiments, the terminal can determine the target number of PRACH retransmissions when retransmitting PRACH based on the initial number of retransmissions when initiating the initial PRACH, and perform PRACH retransmission based on the target number of retransmissions. This clarifies the terminal behavior when initiating random access, improves the success rate of random access, and increases availability.

[0137] In some alternative embodiments, refer to Figure 3a and Figure 3b As shown, Figure 3a and Figure 3b This is a flowchart illustrating a random access method according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0138] In step 301, in response to having sent the Physical Random Access Channel (PRACH) to the base station but not receiving a random access message from the base station, it is determined to retransmit the PRACH.

[0139] The implementation of step 301 is similar to that of step 201, and will not be repeated here.

[0140] In step 302, based on the initial number of repeated transmissions, the target number of repeated transmissions of PRACH is determined when performing the PRACH retransmission.

[0141] The implementation of step 302 is similar to that of step 202, and will not be described again here.

[0142] Similar to the aforementioned embodiments, step 302 can be performed either before or during the PRACH process. That is, it can be performed as follows: Figure 3a As shown, you can execute step 301 first, then step 302; or you can do so as follows: Figure 3b As shown, you can execute step 302 first, and then execute step 301.

[0143] In step 303, the transmission power for PRACH retransmission is determined based on the target number of repeated transmissions.

[0144] In this embodiment of the disclosure, it can be determined whether to perform power boosting during PRACH retransmission based on the target number of repeated transmissions.

[0145] In one possible implementation, the target number of retransmissions is equal to the initial number of retransmissions. Accordingly, considering that the terminal uses the initial number of retransmissions when it first sends PRACH to the base station and does not receive the random access message sent by the base station, in order to improve the success rate of random access, the terminal can determine to perform power boosting when performing PRACH retransmission based on relevant methods.

[0146] In another possible implementation, the target number of retransmissions differs from the initial number of retransmissions. In this disclosure, the target number of retransmissions is greater than the initial number of retransmissions. Accordingly, the terminal can determine not to perform power boosting when performing PRACH retransmissions. That is, the random access success rate is improved by increasing the number of retransmissions. Of course, power boosting can also be performed when the target number of retransmissions is greater than the initial number of retransmissions.

[0147] In step 304, PRACH retransmission is performed based on the target number of repeated transmissions.

[0148] In this embodiment of the disclosure, the target repeated transmission number can be a non-zero positive integer, such as 1, 2, ...

[0149] If the target retransmission count is 1, the terminal will not retransmit the PRACH when initiating a PRACH retransmission.

[0150] If the target retransmission count is greater than 1, the terminal will retransmit the PRACH when initiating a PRACH retransmission, and the number of retransmissions will be equal to the target retransmission count.

[0151] In this embodiment of the present disclosure, when the terminal determines that a power boost is to be performed, it can increase the transmission power of the PRACH transmission and then perform PRACH retransmission based on the increased transmission power.

[0152] Alternatively, if the terminal determines that it will not perform power boosting, it can retransmit the PRACH based on the transmission power of the previous PRACH transmission.

[0153] In the above embodiments, the terminal can determine whether to perform power boosting when performing PRACH retransmission based on the target number of repeated transmissions, thus clarifying the terminal behavior when initiating random access, improving the success rate of random access, and increasing availability.

[0154] In some alternative embodiments, refer to Figure 4a and Figure 4b As shown, Figure 4a and Figure 4b This is a flowchart illustrating a random access method according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0155] In step 401, in response to having sent the Physical Random Access Channel (PRACH) to the base station but not receiving a random access message from the base station, it is determined to retransmit the PRACH.

[0156] The implementation of step 401 is similar to that of step 201, and will not be repeated here.

[0157] In step 402, based on the initial number of repeated transmissions, the target number of repeated transmissions of PRACH is determined when performing the PRACH retransmission.

[0158] The implementation of step 402 is similar to that of step 202, and will not be repeated here.

[0159] Similar to the previous embodiments, step 402 can be performed either before or during the PRACH process. That is, it can be performed as follows: Figure 4a As shown, you can execute step 401 first, then step 402; or you can do so as follows: Figure 4b As shown, you can execute step 402 first, and then execute step 401.

[0160] In step 403, the target resource to be used when performing PRACH retransmission is determined.

[0161] In one possible implementation, when the target number of retransmissions equals the initial number of retransmissions, it can be determined that the target resource used for PRACH retransmission is a resource in a first resource group. Here, the first resource group is a resource group associated with the initial number of retransmissions among multiple resource groups pre-allocated to the terminal. That is, the terminal selects resources from the same resource group as when initially sending the PRACH during PRACH retransmission.

[0162] For example, if the number of repeated transmissions n1 is associated with resource group #1, the number of repeated transmissions n2 is associated with resource group #2, and the number of repeated transmissions n3 is associated with resource group #3, and the initial number of repeated transmissions is n2, then the first resource group is resource group #2, and the target resource used by the terminal when performing PRACH retransmission is the resource in resource group #2.

[0163] In another possible implementation, when the target number of retransmissions equals the initial number of retransmissions, it can be determined that the target resource used for PRACH retransmission is a resource in a dedicated resource pool. Specifically, the dedicated resource pool can be a resource pool configured on the base station side specifically for PRACH retransmission. That is, the terminal can use resources in the dedicated resource pool for PRACH retransmission.

[0164] In another possible implementation, the target number of retransmissions differs from the initial number of retransmissions. Specifically, the target number of retransmissions is greater than the initial number of retransmissions, and the terminal can determine that the target resource used for PRACH retransmission is a resource in a first resource group. Here, the first resource group is a resource group associated with the initial number of retransmissions among multiple resource groups pre-allocated to the terminal.

[0165] In another possible implementation, the target number of retransmissions differs from the initial number of retransmissions. Specifically, if the target number of retransmissions is greater than the initial number of retransmissions, it can be determined that the target resource used for PRACH retransmission is a resource in a dedicated resource pool. Specifically, the dedicated resource pool can be a resource pool specifically configured by the base station for PRACH retransmission. That is, the terminal can use resources in the dedicated resource pool for PRACH retransmission.

[0166] In another possible implementation, the target number of retransmissions is different from the initial number of retransmissions. Specifically, the target number of retransmissions is greater than the initial number of retransmissions. The terminal can determine a second resource group associated with the target number of retransmissions from among multiple resource groups pre-allocated to the terminal. Further, it is determined that the target resource used when performing PRACH retransmission is a resource in the second resource group.

[0167] For example, the number of repeated transmissions n1 is associated with resource group #1, the number of repeated transmissions n2 is associated with resource group #2, and the number of repeated transmissions n3 is associated with resource group #3. The initial number of repeated transmissions is n2, the target number of repeated transmissions is n3, and n3 is greater than n2. Then the second resource group is resource group #3, and the target resource used by the terminal when performing PRACH retransmission is the resource in resource group #3.

[0168] The above is merely an illustrative example. In practical applications, other methods for determining the target resource used when performing PRACH retransmission should fall within the scope of this disclosure.

[0169] In step 404, based on the target number of repeated transmissions, the target resource is used to perform PRACH retransmission.

[0170] In this embodiment of the disclosure, the target repeated transmission number can be a non-zero positive integer, such as 1, 2, ...

[0171] If the target retransmission count is 1, the terminal will not retransmit the PRACH when initiating a PRACH retransmission.

[0172] If the target retransmission count is greater than 1, the terminal will retransmit the PRACH when initiating a PRACH retransmission, and the number of retransmissions will be equal to the target retransmission count.

[0173] In this embodiment of the disclosure, the terminal can use the target resource determined in step 403 to perform PRACH retransmission.

[0174] In the above embodiments, the terminal can determine the target resources used when performing PRACH retransmission based on the target number of retransmissions, thus clarifying the terminal behavior when initiating random access, improving the success rate of random access, and increasing availability.

[0175] Method 2: When performing PRACH retransmission, the target number of retransmissions is determined based on the second measurement value of RSRP of the synchronization signal and at least one preset threshold.

[0176] In one implementation, the method may further include:

[0177] Based on the target number of repeated transmissions, the transmission power is determined when performing PRACH retransmission.

[0178] The implementation method of this step is similar to that of step 303, and will not be repeated here.

[0179] Reference Figure 5 As shown, Figure 5 This is a flowchart illustrating a random access method according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0180] In step 501, in response to having sent the Physical Random Access Channel (PRACH) to the base station but not receiving a random access message from the base station, it is determined to retransmit the PRACH.

[0181] In this embodiment of the disclosure, not receiving a random access message sent by the base station may refer to not receiving msg2 or msg4 sent by the base station, or it may refer to not receiving message B (msgB) sent by the base station.

[0182] In this embodiment of the disclosure, PRACH retransmission means that the terminal does not need to wait until the entire random access process is completed and the random access process is determined to have failed before sending PRACH. Instead, the terminal can retransmit PRACH to the base station even if it has already sent PRACH to the base station and has not received the corresponding msg2, msg4 or msgB returned by the base station.

[0183] In step 502, the RSRP of the synchronization signal is measured to obtain a second measurement value.

[0184] In this embodiment of the disclosure, when the terminal determines to perform a PRACH retransmission, it can obtain a second measurement value based on the RSRP of the synchronization signal measured in real time.

[0185] In step 503, among one or more preset RSRP thresholds, the second RSRP threshold that is greater than the second measured value and has the smallest difference from the second measured value is determined.

[0186] For example, multiple preset thresholds include threshold #1, threshold #2, and threshold #3, where threshold #1, threshold #2, and threshold #3 are all greater than the second measured value. If the difference between threshold #1 and the second measured value is less than the differences between threshold #2 and threshold #3 and the first measured value, then the terminal determines threshold #1 as the second RSRP threshold.

[0187] In step 504, based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the second RSRP threshold is determined as the target number of repeated transmissions.

[0188] For example, if the preset number of repeated transmissions corresponding to threshold #1 is 8, the preset number of repeated transmissions corresponding to threshold #2 is 4, the preset number of repeated transmissions corresponding to threshold #3 is 2, and the second RSRP threshold is threshold #1, then the terminal determines the target number of repeated transmissions to be 8.

[0189] In step 505, PRACH retransmission is performed based on the target number of repeated transmissions.

[0190] In this embodiment of the disclosure, the target repeated transmission number can be a non-zero positive integer, such as 1, 2, ...

[0191] If the target retransmission count is 1, the terminal will not retransmit the PRACH when initiating a PRACH retransmission.

[0192] If the target retransmission count is greater than 1, the terminal will retransmit the PRACH when initiating a PRACH retransmission, and the number of retransmissions will be equal to the target retransmission count.

[0193] In the above embodiments, when determining to perform PRACH retransmission, the terminal can determine the target number of PRACH retransmissions based on the RSRP value of the synchronization signal measured in real time, and perform PRACH retransmission based on the target number of retransmissions. This clarifies the terminal behavior when initiating random access, improves the success rate of random access, and increases availability.

[0194] For example, if the terminal has an SS-RSRP measurement window during the PRACH process, it can remeasure SS-RSRP within that window to obtain a second SS-RSRP measurement value. This second value is then compared with one or more preset RSRP thresholds to determine the first RSRP threshold that is greater than the first measurement value and has the smallest difference from it. Next, based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the first RSRP threshold is determined as the third number of repeated transmissions. If the terminal does not have an SS-RSRP measurement window during the PRACH process, the initial number of repeated transmissions is used to determine the third number of repeated transmissions. Of course, this is just an example and not the only way to determine the third number of repeated transmissions.

[0195] In some alternative embodiments, refer to Figure 6 As shown, Figure 6 This is a flowchart illustrating a random access method according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0196] In step 601, in response to having sent the Physical Random Access Channel (PRACH) to the base station but not receiving a random access message from the base station, it is determined to retransmit the PRACH.

[0197] The implementation of step 601 is similar to that of step 501, and will not be repeated here.

[0198] In step 602, the RSRP of the synchronization signal is measured to obtain a second measurement value.

[0199] The implementation of step 602 is similar to that of step 502, and will not be described again here.

[0200] In step 603, among one or more preset RSRP thresholds, the second RSRP threshold that is greater than the second measured value and has the smallest difference from the second measured value is determined.

[0201] The implementation of step 603 is similar to that of step 503, and will not be repeated here.

[0202] In step 604, based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the second RSRP threshold is determined as the target number of repeated transmissions.

[0203] The implementation of step 604 is similar to that of step 504, and will not be described again here.

[0204] In step 605, the transmission power for PRACH retransmission is determined based on the target number of repeated transmissions.

[0205] In one possible implementation, when the terminal performs the RACH retransmission based on the target number of retransmissions, it can determine that no power boosting will be performed.

[0206] In another possible implementation, in response to determining that the target number of retransmissions is different from the third retransmission of the previous retransmission of PRACH, i.e., the number of retransmissions has changed, the terminal determines not to perform power boost.

[0207] In another possible implementation, in response to determining that the target number of retransmissions is the same as the third retransmission of the previous retransmission of PRACH, i.e. the number of retransmissions has not changed, the terminal determines to perform a power boost.

[0208] In step 606, PRACH retransmission is performed based on the target number of repeated transmissions.

[0209] In this embodiment of the disclosure, the target repeated transmission number can be a non-zero positive integer, such as 1, 2, ...

[0210] If the target retransmission count is 1, the terminal will not retransmit the PRACH when initiating a PRACH retransmission.

[0211] If the target retransmission count is greater than 1, the terminal will retransmit the PRACH when initiating a PRACH retransmission, and the number of retransmissions will be equal to the target retransmission count.

[0212] In this embodiment of the present disclosure, when the terminal determines that a power boost is to be performed, it can increase the transmission power of the PRACH transmission and then perform PRACH retransmission based on the increased transmission power.

[0213] Alternatively, if the terminal determines that it will not perform power boosting, it can retransmit the PRACH based on the transmission power of the previous PRACH transmission.

[0214] In one implementation, the method may further include:

[0215] Based on the target number of repeated transmissions, the transmission power is determined when performing PRACH retransmission.

[0216] The implementation method of this step is similar to that of step 303, and will not be repeated here.

[0217] In the above embodiments, the terminal can determine whether to perform power boosting when performing PRACH retransmission based on the target number of repeated transmissions, thus clarifying the terminal behavior when initiating random access, improving the success rate of random access, and increasing availability.

[0218] In one implementation, the method may further include:

[0219] Determine the target resource to use when performing PRACH retransmission.

[0220] The implementation method of this step is similar to that of step 705, and will not be repeated here.

[0221] In some alternative embodiments, refer to Figure 7 As shown, Figure 7 This is a flowchart illustrating a random access method according to an embodiment, which can be executed by a terminal. The method may include the following steps:

[0222] In step 701, in response to having sent the Physical Random Access Channel (PRACH) to the base station but not receiving a random access message from the base station, it is determined to retransmit the PRACH.

[0223] The implementation of step 701 is similar to that of step 501, and will not be repeated here.

[0224] In step 702, the RSRP of the synchronization signal is measured to obtain a second measurement value.

[0225] The implementation of step 702 is similar to that of step 502, and will not be described again here.

[0226] In step 703, among one or more preset RSRP thresholds, the second RSRP threshold that is greater than the second measured value and has the smallest difference from the second measured value is determined.

[0227] The implementation of step 703 is similar to that of step 503, and will not be described again here.

[0228] In step 704, based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the second RSRP threshold is determined as the target number of repeated transmissions.

[0229] The implementation of step 704 is similar to that of step 504, and will not be described again here.

[0230] In step 705, the target resource to be used when performing PRACH retransmission is determined.

[0231] In one possible implementation, the terminal may determine a second resource group associated with the target number of retransmissions from among a plurality of resource groups pre-allocated to the terminal, and further determine that the target resource used when performing PRACH retransmission is a resource in the second resource group.

[0232] In another possible implementation, the terminal can determine that the target resource used for PRACH retransmission is a resource in a dedicated resource pool. Specifically, the dedicated resource pool can be a resource pool configured by the base station specifically for PRACH retransmission. That is, the terminal can use resources in the dedicated resource pool for PRACH retransmission.

[0233] The above is merely an illustrative example. In practical applications, other methods for determining the target resource used when performing PRACH retransmission should fall within the scope of this disclosure.

[0234] In step 706, based on the target number of repeated transmissions, the target resource is used to perform PRACH retransmission.

[0235] In this embodiment of the disclosure, the target repeated transmission number can be a non-zero positive integer, such as 1, 2, ...

[0236] If the target retransmission count is 1, the terminal will not retransmit the PRACH when initiating a PRACH retransmission.

[0237] If the target retransmission count is greater than 1, the terminal will retransmit the PRACH when initiating a PRACH retransmission, and the number of retransmissions will be equal to the target retransmission count.

[0238] In this embodiment of the disclosure, the terminal can use the target resource determined in step 705 to perform PRACH retransmission.

[0239] In one implementation, the method may further include:

[0240] Based on the target number of repeated transmissions, the transmission power is determined when performing PRACH retransmission.

[0241] The implementation method of this step is similar to that of step 303, and will not be repeated here.

[0242] In the above embodiments, the terminal can determine the target resources used when performing PRACH retransmission based on the target number of retransmissions, thus clarifying the terminal behavior when initiating random access, improving the success rate of random access, and increasing availability.

[0243] To facilitate understanding, the above scheme is further illustrated with examples below.

[0244] In Example 1, the terminal only needs to compare the measurement result of SS-RSRP (i.e., the first measurement value) with one or more preset RSRP thresholds when it first sends PRACH to the base station to determine whether to perform PRACH retransmission and / or determine the number of PRACH retransmissions.

[0245] When a terminal determines to perform a PRACH retransmission, the target number of retransmissions of the PRACH during the retransmission is determined based on the initial retransmission count. The initial retransmission count is the number of retransmissions of the PRACH determined when the terminal first sends the PRACH to the base station.

[0246] One implementation is to keep the number of target retransmissions equal to the number of initial retransmissions.

[0247] Optionally, in this scheme, the terminal performs power boosting based on relevant methods when performing PRACH retransmission.

[0248] Optionally, when performing PRACH retransmission, resources in the first resource pool can be selected for PRACH retransmission. The first resource pool is a resource pool pre-allocated to the terminal that is associated with the initial number of retransmissions.

[0249] Another approach is to make the target repeat transmission count greater than the initial repeat transmission count.

[0250] For example, the target number of repeated transmissions = the initial number of repeated transmissions × alpha, where alpha > 1.

[0251] Optionally, in this scheme, the terminal no longer performs power boosting when performing PRACH retransmission.

[0252] Optionally, in this scheme, the terminal determines the associated second resource group based on the target number of repeated transmissions, and uses the resources in the second resource group for PRACH retransmission.

[0253] In Example 2, the target number of repeated PRACH transmissions and whether to perform PRACH retransmission when the terminal performs PRACH retransmission are also determined by judging the RSRP threshold.

[0254] Specifically, the terminal can measure the RSRP of the synchronization signal to obtain a second measurement value, and then determine the second RSRP threshold that is greater than the second measurement value and has the smallest difference from the second measurement value among one or more preset RSRP thresholds. Based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the second RSRP threshold is determined as the target number of repeated transmissions.

[0255] Optionally, in this scheme, the terminal no longer performs power boosting when performing PRACH retransmission.

[0256] Optionally, in this scheme, if the target retransmission count of the terminal is different from the third retransmission count of the previous retransmission of PRACH, it is determined that no power boosting will be performed during PRACH retransmission. Optionally, in this scheme, the terminal determines the associated second resource group based on the target retransmission count and uses the resources in the second resource group for PRACH retransmission.

[0257] The above is merely an illustrative example. Those skilled in the art will understand that other methods for determining whether to perform a PRACH retransmission, determining the target number of retransmissions of the PRACH when performing a PRACH retransmission, and determining the transmission power and target resources used when performing a PRACH retransmission should all fall within the scope of protection of this disclosure.

[0258] Corresponding to the aforementioned embodiments of the application function implementation method, this disclosure also provides embodiments of the application function implementation apparatus.

[0259] Reference Figure 8 , Figure 8 This is a block diagram of a random access device according to an exemplary embodiment, the device being applied to a terminal, comprising:

[0260] The first determining module 801 is configured to determine to retransmit the physical random access channel (PRACH) in response to having sent the PRACH to the base station and not receiving a random access message from the base station.

[0261] The second determining module 802 is configured to determine the target number of repeated transmissions of PRACH when performing PRACH retransmission.

[0262] The transmission module 803 is configured to perform PRACH retransmission based on the target repeated transmission number.

[0263] For the device embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. 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 modules can be selected to achieve the purpose of this disclosure according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0264] Accordingly, this disclosure also provides a computer-readable storage medium storing a computer program for executing any of the random access methods described above.

[0265] Accordingly, this disclosure also provides a random access device, including:

[0266] processor;

[0267] Memory used to store processor-executable instructions;

[0268] The processor is configured to execute any of the random access methods described above.

[0269] Figure 9 This is a block diagram illustrating a random access device 900 according to an exemplary embodiment. For example, device 900 may be a mobile phone, tablet computer, e-book reader, multimedia playback device, wearable device, in-vehicle user equipment, iPad, smart TV, or other terminal.

[0270] Reference Figure 9 The device 900 may include one or more of the following components: processing component 902, memory 904, power supply component 906, multimedia component 908, audio component 910, input / output (I / O) interface 912, sensor component 916, and communication component 918.

[0271] Processing component 902 typically controls the overall operation of device 900, such as operations associated with display, telephone calls, random data access, camera operation, and recording operations. Processing component 902 may include one or more processors 920 to execute instructions to perform all or part of the steps of the random access method described above. Furthermore, processing component 902 may include one or more modules to facilitate interaction between processing component 902 and other components. For example, processing component 902 may include a multimedia module to facilitate interaction between multimedia component 908 and processing component 902. Alternatively, processing component 902 may read executable instructions from memory to implement the steps of a random access method provided in the above embodiments.

[0272] Memory 904 is configured to store various types of data to support the operation of device 900. Examples of this data include instructions for any application or method operating on device 900, contact data, phonebook data, messages, pictures, videos, etc. Memory 904 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0273] Power supply component 906 provides power to various components of device 900. Power supply component 906 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power to device 900.

[0274] The multimedia component 908 includes a display screen that provides an output interface between the device 900 and the user. In some embodiments, the multimedia component 908 includes a front-facing camera and / or a rear-facing camera. When the device 900 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera can receive external multimedia data. Each front-facing camera and rear-facing camera can be a fixed optical lens system or have focal length and optical zoom capabilities.

[0275] Audio component 910 is configured to output and / or input audio signals. For example, audio component 910 includes a microphone (MIC) configured to receive external audio signals when device 900 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 904 or transmitted via communication component 918. In some embodiments, audio component 910 also includes a speaker for outputting audio signals.

[0276] I / O interface 912 provides an interface between processing component 902 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0277] Sensor assembly 916 includes one or more sensors for providing status assessments of various aspects of device 900. For example, sensor assembly 916 can detect the on / off state of device 900, the relative positioning of components such as the display and keypad of device 900, changes in position of device 900 or a component of device 900, the presence or absence of user contact with device 900, orientation or acceleration / deceleration of device 900, and temperature changes of device 900. Sensor assembly 916 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 916 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 916 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0278] Communication component 918 is configured to facilitate wired or wireless communication between device 900 and other devices. Device 900 can access wireless networks based on communication standards, such as Wi-Fi, 2G, 3G, 4G, 5G, or 6G, or combinations thereof. In one exemplary embodiment, communication component 918 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 918 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0279] In an exemplary embodiment, the device 900 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform any of the random access methods described above on the terminal side.

[0280] In an exemplary embodiment, a non-transitory machine-readable storage medium including instructions is also provided, such as a memory 904 including instructions, which can be executed by a processor 920 of the device 900 to complete the random access method described above. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0281] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0282] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A random access method, characterized in that, The method is executed by a terminal and includes: In response to having sent a Physical Random Access Channel (PRACH) to the base station but not receiving a random access message from the base station, it is determined to retransmit the PRACH. Determine the target number of retransmissions of PRACH when performing PRACH retransmission; Based on the target number of repeated transmissions, perform PRACH retransmission; Determining the target number of PRACH retransmissions during PRACH retransmission includes: Based on the initial number of repeated transmissions, the target number of repeated transmissions is determined; wherein, the initial number of repeated transmissions is the number of repeated transmissions of the PRACH determined when the terminal first sends the PRACH to the base station; wherein, the target number of repeated transmissions is equal to the initial number of repeated transmissions, or, the target number of repeated transmissions is greater than the initial number of repeated transmissions; The method further includes: Before sending PRACH to the base station for the first time, the reference signal received power RSRP of the synchronization signal is measured to obtain a first measurement value; Among one or more preset RSRP thresholds, a first RSRP threshold that is greater than the first measured value and has the smallest difference from the first measured value is determined; Based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the first RSRP threshold is determined as the initial number of repeated transmissions.

2. The method according to claim 1, characterized in that, Determining the target number of repeated transmissions based on the initial number of repeated transmissions includes: If message 2 sent by the base station is not received, a second number of repeated transmissions greater than the initial number of repeated transmissions is determined; The target number of repeated transmissions is determined to be equal to the second number of repeated transmissions.

3. The method according to claim 1 or 2, characterized in that, The method further includes: Based on the target number of repeated transmissions, the transmission power is determined when performing PRACH retransmission.

4. The method according to claim 3, characterized in that, The step of determining the transmission power for PRACH retransmission based on the target number of repeated transmissions includes: When the target number of repeated transmissions is equal to the initial number of repeated transmissions, power boosting is determined during PRACH retransmission; When the target number of repeated transmissions is greater than the initial number of repeated transmissions, it is determined that no power boosting will be performed during PRACH retransmission.

5. The method according to claim 1 or 2, characterized in that, The method further includes: Determine the target resource to use when performing PRACH retransmission.

6. The method according to claim 5, characterized in that, The determination of the target resources used when performing PRACH retransmission includes: When the target number of retransmissions is equal to the initial number of retransmissions, it is determined that the target resource used for PRACH retransmission is a resource in the first resource group; wherein, the first resource group is a resource group associated with the initial number of retransmissions among a plurality of resource groups pre-allocated to the terminal.

7. The method according to claim 5, characterized in that, The method further includes: When the target number of repeated transmissions is greater than the initial number of repeated transmissions, a second resource group associated with the target number of repeated transmissions is determined from among the multiple resource groups pre-allocated to the terminal; The determination of the target resources used when performing PRACH retransmission includes: The target resource used for PRACH retransmission is determined to be a resource in the second resource group.

8. The method according to claim 1, characterized in that, The method further includes: The RSRP of the synchronization signal is measured to obtain the second measurement value; Among one or more preset RSRP thresholds, a second RSRP threshold that is greater than the second measured value and has the smallest difference from the second measured value is determined; Determining the target number of PRACH retransmissions during PRACH retransmission includes: Based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the second RSRP threshold is determined as the target number of repeated transmissions.

9. The method according to claim 8, characterized in that, The method further includes: Based on the target number of repeated transmissions, the transmission power is determined when performing PRACH retransmission.

10. The method according to claim 9, characterized in that, The step of determining the transmission power for PRACH retransmission based on the target number of repeated transmissions includes: When performing RACH retransmission based on the target number of retransmissions, it is determined that no power boosting will be performed during RACH retransmission; or In response to determining that the target retransmission count is different from the third retransmission count of the previous retransmission of PRACH, it is determined that no power boosting will be performed during PRACH retransmission.

11. The method according to claim 8, characterized in that, The method further includes: Determine the target resource to use when performing PRACH retransmission.

12. The method according to claim 11, characterized in that, The method further includes: Among the multiple resource groups pre-allocated to the terminal, a second resource group associated with the target number of repeated transmissions is determined; The determination of the target resources used when performing PRACH retransmission includes: The target resource used for PRACH retransmission is determined to be a resource in the second resource group.

13. A random access device, characterized in that, The device is applied to a terminal and includes: The first determining module is configured to determine to retransmit the Physical Random Access Channel (PRACH) in response to having sent the PRACH to the base station but not receiving a random access message from the base station. The second determining module is configured to determine the target number of repeated transmissions of PRACH when performing PRACH retransmission. The transmission module is configured to perform PRACH retransmission based on the target repeated transmission count; The second determining module is also configured to: Based on the initial number of repeated transmissions, the target number of repeated transmissions is determined; wherein, the initial number of repeated transmissions is the number of repeated transmissions of the PRACH determined when the terminal first sends the PRACH to the base station; wherein, the target number of repeated transmissions is equal to the initial number of repeated transmissions, or, the target number of repeated transmissions is greater than the initial number of repeated transmissions; The device is also configured to: Before sending PRACH to the base station for the first time, the reference signal received power RSRP of the synchronization signal is measured to obtain a first measurement value; Among one or more preset RSRP thresholds, a first RSRP threshold that is greater than the first measured value and has the smallest difference from the first measured value is determined; Based on the preset number of repeated transmissions corresponding to different RSRP thresholds, the preset number of repeated transmissions corresponding to the first RSRP threshold is determined as the initial number of repeated transmissions.

14. The apparatus according to claim 13, characterized in that, The second determining module is also configured to: Determine the target resource to use when performing PRACH retransmission.

15. The apparatus according to claim 14, characterized in that, The second determining module is also configured to: When the target number of retransmissions is equal to the initial number of retransmissions, it is determined that the target resource used for PRACH retransmission is a resource in the first resource group; wherein, the first resource group is a resource group associated with the initial number of retransmissions among a plurality of resource groups pre-allocated to the terminal.

16. The apparatus according to claim 14, characterized in that, The second determining module is also configured to: When the target number of repeated transmissions is greater than the initial number of repeated transmissions, a second resource group associated with the target number of repeated transmissions is determined from among the multiple resource groups pre-allocated to the terminal; The target resource used for PRACH retransmission is determined to be a resource in the second resource group.

17. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which is used by a processor to execute the random access method according to any one of claims 1-12.

18. A random access device, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured to execute the random access method according to any one of claims 1-12.

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