PRACH repeat transfer method, apparatus, system, and computer-readable storage medium

Abstract

The present disclosure provides a PRACH repeated transmission method, device, system and computer-readable storage medium, which relate to the field of wireless communication technology. The method includes: configuring a first PRACH transmission resource and a second PRACH transmission resource, wherein the first PRACH transmission resource is only used for a single PRACH transmission, and the second PRACH transmission resource is only used for repeated PRACH transmission.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communication technology, and in particular to a physical random access channel (PRACH) repeated transmission method, device, system and computer-readable storage medium. Background Art

[0002] The 3GPP NR Realease-17 protocol does not yet support repeated transmission of PRACH. According to the current protocol version, the User Equipment (UE) calculates the Random Access-Radio Network Temporary Identifier (RA-RNTI) according to the PRACH transmission timing of the preamble, and monitors the Physical Downlink Control Channel (PDCCH) within the Random Access Response (RAR) time window. If the monitored Downlink Control Information (DCI) is successfully descrambled using the RA-RNTI, and the Random Access Preamble Identifier (RAPID) corresponding to the preamble sent by the UE is received according to the scheduling of the DCI, it proves that the PRACH transmission is successful; if it is unsuccessful, the UE needs to re-transmit the PRACH, which will not only cause additional delays, but also waste PRACH transmission resources. Summary of the invention

[0003] The inventors have noticed that in order to implement PRACH repeated transmission, PRACH transmission resources need to be configured for PRACH repeated transmission. If the existing PRACH transmission resources used for PRACH single transmission are reused, the probability of PRACH transmission conflict will increase.

[0004] In order to solve the above problems, the embodiments of the present disclosure propose the following solutions.

[0005] According to one aspect of an embodiment of the present disclosure, a PRACH repeated transmission method is provided, which is applied to a network side, including: configuring a first PRACH transmission resource and a second PRACH transmission resource, wherein the first PRACH transmission resource is only used for a single PRACH transmission, and the second PRACH transmission resource is only used for repeated PRACH transmission.

[0006] In some embodiments, configuring the second PRACH transmission resource includes: configuring a set of candidate PRACH repetition transmission times supported by the network side.

[0007] In some embodiments, configuring the second PRACH transmission resource also includes: configuring at least one of a first parameter and a second parameter, wherein the first parameter is used to indicate an association between each candidate PRACH repetition transmission number and a preamble code, and the second parameter is used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number among at least some of the candidate PRACH repetition transmission numbers.

[0008] In some embodiments, the at least some of the candidate PRACH repetition transmission times include every PRACH repetition transmission time except a maximum candidate PRACH repetition transmission time.

[0009] In some embodiments, different candidate PRACH repetition transmission times are associated with different preamble codes.

[0010] In some embodiments, configuring the second PRACH transmission resource also includes: configuring a third parameter, wherein the third parameter is used to indicate an association relationship between each SSB index and the preamble code.

[0011] In some embodiments, the first parameter is configured according to the third parameter, each SSB index is associated with M preamble codes, and there are Q candidate PRACH repetition transmission times in the candidate PRACH repetition transmission number set, M mod Q = K, K candidate PRACH repetition transmission times in the candidate PRACH repetition transmission time set are associated with P+1 preamble codes, other candidate PRACH repetition transmission times in the candidate PRACH repetition transmission time set except the K candidate PRACH repetition transmission times are associated with P preamble codes, and M and Q are both greater than or equal to 1.

[0012] In some embodiments, the second parameter includes a bit sequence corresponding to each candidate PRACH repetition transmission number, the sequence length of the bit sequence is equal to the maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set, each bit in the bit sequence corresponds to a PRACH transmission opportunity, and the value of each bit in the bit sequence indicates whether to use the corresponding PRACH transmission opportunity for repeated transmission.

[0013] In some embodiments, when the value is 1, it indicates that the corresponding PRACH transmission opportunity is used for repeated transmission; when the value is 0, it indicates that the corresponding PRACH transmission opportunity is not used for repeated transmission.

[0014] In some embodiments, configuring the second PRACH transmission resource also includes: configuring a fourth parameter, the fourth parameter being used to indicate an association relationship between each SSB index and multiple PRACH transmission opportunities, the first group of PRACH transmission opportunities including a second group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number among at least part of the candidate PRACH repetition transmission numbers in the multiple PRACH transmission opportunities associated with each SSB index.

[0015] In some embodiments, the method also includes: performing detection on at least part of the PRACH transmission opportunities in the second PRACH transmission resource to obtain a first preamble code repeatedly transmitted by a user equipment UE; determining a random access radio network temporary identifier RA-RNTI based on a PRACH transmission opportunity in the at least part of the PRACH transmission opportunities; using the RA-RNTI to scramble the first downlink control information DCI to obtain a second DCI; sending the second DCI and a random access response RAR scheduled by the second DCI, the RAR carrying the random access preamble code identifier RAPID of the first preamble code.

[0016] In some embodiments, configuring the second PRACH transmission resource also includes: configuring a second parameter, wherein the second parameter is used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number among at least some of the candidate PRACH repetition transmission times; wherein the at least some of the PRACH transmission opportunities include the first group of PRACH transmission opportunities.

[0017] In some embodiments, configuring the second PRACH transmission resource also includes: configuring a fourth parameter, the fourth parameter being used to indicate an association relationship between each SSB index and multiple PRACH transmission opportunities, the first group of PRACH transmission opportunities including a second group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number among the at least some of the candidate PRACH repetition transmission numbers in the multiple PRACH transmission opportunities associated with each SSB; wherein the at least some of the PRACH transmission opportunities include the second group of PRACH transmission opportunities.

[0018] In some embodiments, there exists an i such that the i-th PRACH transmission timings in the first group of PRACH transmission timings are different from those in the second group of PRACH transmission timings, and the one PRACH transmission timing is the i-th PRACH transmission timing.

[0019] In some embodiments, multiple PRACH transmission opportunities associated with each SSB index do not overlap in the time domain.

[0020] In some embodiments, multiple PRACH transmission opportunities associated with each SSB index are arranged consecutively in the time domain.

[0021] In some embodiments, the maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set does not exceed the number of multiple PRACH transmission opportunities associated with each SSB index.

[0022] According to another aspect of an embodiment of the present disclosure, a PRACH repeated transmission method is provided, which is applied to the network side, including: sending configuration information, wherein the configuration information indicates a first PRACH transmission resource used only for a single PRACH transmission and a second PRACH transmission resource used only for repeated PRACH transmission.

[0023] According to another aspect of an embodiment of the present disclosure, a PRACH repeated transmission method is provided, which is applied to a UE, including: receiving configuration information, wherein the configuration information indicates a first PRACH transmission resource used only for a single PRACH transmission and a second PRACH transmission resource used only for repeated PRACH transmission; and transmitting a preamble code according to the configuration information.

[0024] In some embodiments, the configuration information also includes a set of candidate PRACH repetition transmission times supported by the network side; transmitting the preamble code according to the configuration information includes: determining a PRACH repetition transmission time m in the set of candidate PRACH repetition transmission times; and using the second PRACH transmission resource to repeatedly transmit the first preamble code m times.

[0025] In some embodiments, the configuration information also includes at least one of a first parameter and a second parameter, the first parameter being used to indicate an association between each candidate PRACH repetition transmission number and a preamble code, and the second parameter being used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number among at least some of the candidate PRACH repetition transmission numbers; the use of the second PRACH transmission resource to repeatedly transmit the first preamble code m times includes: when the configuration information includes the second parameter, determining the first group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m according to the second parameter; repeatedly transmitting the first preamble code m times at the first group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m; when the configuration information includes the first parameter, the first preamble code belongs to the preamble code associated with the PRACH repetition transmission number m.

[0026] In some embodiments, the at least some of the candidate PRACH repetition transmission times include every PRACH repetition transmission time except a maximum candidate PRACH repetition transmission time.

[0027] In some embodiments, the configuration information also includes a third parameter, and the third parameter is used to indicate the association relationship between each SSB index and the preamble code, and the first preamble code belongs to the preamble code associated with an SSB index selected by the UE.

[0028] In some embodiments, the first parameter is configured according to the third parameter, each SSB index is associated with M preamble codes, and there are Q candidate PRACH repetition transmission times in the candidate PRACH repetition transmission number set, M mod Q = K, the K candidate PRACH repetition transmission times in the candidate PRACH repetition transmission time set are associated with P+1 preamble codes, and the other candidate PRACH repetition transmission times in the candidate PRACH repetition transmission time set except the K candidate PRACH repetition transmission times are associated with P preamble codes, and M and Q are both greater than or equal to 1; the first preamble code belongs to the preamble code associated with the PRACH repetition transmission time m among the M preamble codes associated with the SSB index selected by the UE.

[0029] In some embodiments, the second parameter includes a bit sequence corresponding to each candidate PRACH repetition transmission number, the sequence length of the bit sequence is equal to the maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set, each bit in the bit sequence corresponds to a PRACH transmission opportunity, and the value of each bit in the bit sequence indicates whether to use the corresponding PRACH transmission opportunity for repeated transmission.

[0030] In some embodiments, when the value is 1, it indicates that the corresponding PRACH transmission opportunity is used for repeated transmission; when the value is 0, it indicates that the corresponding PRACH transmission opportunity is not used for repeated transmission.

[0031] In some embodiments, the configuration information also includes a fourth parameter, and the fourth parameter is used to indicate the association relationship between each SSB index and multiple PRACH transmission opportunities, the first group of PRACH transmission opportunities including a second group of PRACH transmission opportunities corresponding to each PRACH repetition transmission number of at least part of the candidate PRACH repetition transmission numbers in the multiple PRACH transmission opportunities associated with each SSB index; the repeated transmission of the first preamble code m times on the first group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m includes: repeatedly transmitting the first preamble code m times on the second group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m among the multiple PRACH transmission opportunities associated with an SSB index selected by the UE.

[0032] In some embodiments, multiple PRACH transmission opportunities associated with each SSB index do not overlap in the time domain.

[0033] In some embodiments, multiple PRACH transmission opportunities associated with each SSB index are arranged consecutively in the time domain.

[0034] In some embodiments, the maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set does not exceed the number of multiple PRACH transmission opportunities associated with each SSB index.

[0035] In some embodiments, the method also includes: receiving a second DCI; determining the RA-RNTI based on a PRACH transmission timing in the first group of PRACH transmission timings corresponding to the PRACH repetition transmission number m; using the RA-RNTI to descramble the second DCI to obtain the first DCI; and receiving the RAR based on the first DCI.

[0036] In some embodiments, the configuration information also includes a fourth parameter, which is used to indicate the association relationship between each SSB index and multiple PRACH transmission opportunities, the first group of PRACH transmission opportunities including a second group of PRACH transmission opportunities corresponding to each PRACH repetition transmission number m in the PRACH transmission opportunity associated with each SSB index; the one PRACH transmission opportunity belongs to the second group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m among the multiple PRACH transmission opportunities associated with the SSB index selected by the UE.

[0037] In some embodiments, there exists an i such that the i-th PRACH transmission opportunity in each second group of PRACH transmission opportunities is different, and the one PRACH transmission opportunity is the i-th PRACH transmission opportunity.

[0038] In some embodiments, the method further comprises: executing a subsequent random access procedure when the RAR carries the RAPID of the first preamble code.

[0039] According to another aspect of an embodiment of the present disclosure, a PRACH repeated transmission device is provided, which is applied to a network side, and includes: a configuration module, which is configured to configure a first PRACH transmission resource and a second PRACH transmission resource, wherein the first PRACH transmission resource is only used for a single PRACH transmission, and the second PRACH transmission resource is only used for repeated PRACH transmission.

[0040] According to another aspect of an embodiment of the present disclosure, a PRACH repeated transmission device is provided, which is applied to a network side, and includes: a memory; and a processor coupled to the memory, and configured to execute the method described in any one of the above embodiments based on instructions stored in the memory.

[0041] According to another aspect of an embodiment of the present disclosure, a PRACH repeated transmission device is provided, which is applied to a UE, and includes: a receiving module, configured to receive configuration information, wherein the configuration information indicates a first PRACH transmission resource used only for a single PRACH transmission and a second PRACH transmission resource used only for repeated PRACH transmission; and a transmission module, configured to transmit a preamble code according to the configuration information.

[0042] According to another aspect of an embodiment of the present disclosure, a PRACH repeated transmission device is provided, which is applied to a UE, and includes: a memory; and a processor coupled to the memory, and configured to execute the method described in any one of the above embodiments based on instructions stored in the memory.

[0043] According to another aspect of an embodiment of the present disclosure, a base station is provided, comprising the device described in any one of the above embodiments applied to the network side.

[0044] According to another aspect of an embodiment of the present disclosure, a user equipment is provided, comprising the apparatus described in any one of the above embodiments applied to UE.

[0045] According to another aspect of the embodiments of the present disclosure, a PRACH repeated transmission system is provided, comprising: the base station and user equipment described in any one of the above embodiments.

[0046] According to another aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, comprising computer program instructions, wherein when the computer program instructions are executed by a processor, the method described in any one of the above embodiments is implemented.

[0047] According to another aspect of the embodiments of the present disclosure, a computer program product is provided, including a computer program, wherein when the computer program is executed by a processor, the method described in any one of the above embodiments is implemented.

[0048] In the disclosed embodiment, by configuring a first PRACH transmission resource used only for a single PRACH transmission and a second PRACH transmission resource used only for repeated PRACH transmission, the probability of conflict between a single PRACH transmission and repeated PRACH transmission is reduced while ensuring a single PRACH transmission and realizing repeated PRACH transmission.

[0049] The technical solution of the present disclosure is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 is a flowchart of a PRACH repeated transmission method according to some embodiments of the present disclosure;

[0052] Figure 2 is a schematic diagram of the association relationship between the SSB index and the PRACH transmission opportunity according to some embodiments of the present disclosure;

[0053] Figure 3 is a schematic diagram of the association relationship between the SSB index and the PRACH transmission opportunity according to some other embodiments of the present disclosure;

[0054] Figure 4 is a schematic diagram of the association relationship between the SSB index and the PRACH transmission opportunity according to some embodiments of the present disclosure;

[0055] Figure 5 is a schematic diagram of a process of performing PRACH detection on the network side according to some embodiments of the present disclosure;

[0056] Figure 6 is a flowchart of a PRACH repeated transmission method according to some other embodiments of the present disclosure;

[0057] Figure 7 is a structural diagram of a PRACH repeated transmission device according to some embodiments of the present disclosure;

[0058] Figure 8 is a structural diagram of a PRACH repeated transmission device according to some other embodiments of the present disclosure;

[0059] Fig. 9 is a structural schematic diagram of a PRACH transmission device according to some further embodiments of the present disclosure;

[0060] Fig.10 It is a structural diagram of a PRACH repeated transmission system according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0062] Unless specifically stated otherwise, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0063] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0064] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0065] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0066] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0067] Figure 1 The present invention is a flowchart of a PRACH repeated transmission method according to some embodiments of the present invention. The PRACH repeated transmission method is applied to the network side.

[0068] In step 102, the network side configures a first PRACH transmission resource and a second PRACH transmission resource, the first PRACH transmission resource is only used for a single PRACH transmission, and the second PRACH transmission resource is only used for repeated PRACH transmission.

[0069] It can be understood that since the first PRACH transmission resource is only used for a single PRACH transmission and the second PRACH transmission resource is only used for repeated PRACH transmission, there is no resource overlap between the first PRACH transmission resource and the second PRACH transmission resource. In other words, the first PRACH transmission opportunity included in the first PRACH transmission resource and the second PRACH transmission opportunity included in the second PRACH transmission resource do not overlap in at least one of the time domain and the frequency domain. In some embodiments, the first PRACH transmission opportunity and the second PRACH transmission opportunity do not overlap in the time domain, which is conducive to improving the probability of successful PRACH transmission, thereby improving the coverage performance of PRACH.

[0070] The network side reduces the probability of resource conflict between PRACH single transmission and PRACH repeated transmission on the basis of ensuring PRACH single transmission and realizing PRACH repeated transmission through the above method.

[0071] The following describes the implementation method of configuring the second PRACH transmission resource on the network side in combination with different embodiments.

[0072] In some embodiments, configuring the second PRACH transmission resource on the network side includes: configuring a set of candidate PRACH repetition transmission times supported by the network side. The set of candidate PRACH repetition transmission times includes at least one candidate PRACH repetition transmission time, for example, only one candidate PRACH repetition transmission time or multiple candidate PRACH repetition transmission times.

[0073] For example, the network side configures the candidate PRACH repetition number set as {2, 4, 8}. The UE selects a PRACH repetition number from the candidate PRACH repetition number set configured by the network side for PRACH repetition transmission. The network side configures the candidate PRACH repetition number set so that the UE can more flexibly select the number of repetitions of the preamble code according to the demand, thereby reducing resource waste.

[0074] In some embodiments, configuring the second PRACH transmission resource on the network side further includes: configuring at least one of a first parameter and a second parameter. The first parameter is used to indicate the association between each candidate PRACH repetition transmission number and the preamble code, and the second parameter is used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number in at least some of the candidate PRACH repetition transmission numbers.

[0075] When the first parameter is configured on the network side, the UE selects a preamble from the preambles associated with the number of PRACH repetition transmissions selected by the UE according to the first parameter and retransmits it. Subsequently, the network side can determine the number of PRACH repetition transmissions selected by the UE according to the received preamble, and distinguish between UEs performing single PRACH transmission and UEs performing repeated PRACH transmissions, which helps to reduce the probability of resource conflicts between UEs performing single PRACH transmission and UEs performing repeated PRACH transmissions.

[0076] In some embodiments, different candidate PRACH repetition transmission times are associated with different preambles. In other words, when the PRACH repetition transmission times determined by two UEs are different, the transmitted preambles are also different when performing PRACH repetition transmissions. When the network side performs PRACH detection, it can determine the PRACH repetition transmission times selected by the UE based on the received preamble, thereby distinguishing UEs that select different PRACH repetition transmission times. The above method can avoid UEs that select different candidate PRACH repetition transmission times from transmitting the same preamble, thereby avoiding resource conflicts for UEs that select different PRACH repetition transmission times.

[0077] When the second parameter is configured on the network side, the UE determines the first group of PRACH repetition transmission opportunities associated with the number of PRACH repetition transmissions selected by the UE based on the second parameter. When the network side subsequently performs PRACH detection, it performs PRACH detection on each first group of PRACH repetition transmission opportunities group by group, which can avoid missing PRACH transmission opportunities and increase the probability of detecting the preamble code transmitted by the UE. In addition, the network side can determine whether the UE performs PRACH repetition transmission based on the PRACH transmission timing of the received preamble code, and distinguish between UEs performing PRACH single transmission and UEs performing PRACH repetition transmission, which helps to reduce the probability of resource conflicts between UEs performing PRACH repetition transmission and UEs performing PRACH single transmission.

[0078] In some embodiments, configuring the second PRACH transmission resource on the network side further includes: configuring a third parameter, where the third parameter is used to indicate an association relationship between each SSB index and the preamble code.

[0079] The network side determines the SSB index selected by the UE based on the third parameter, and then determines the beam with the best transmission quality selected by the UE. Transmitting the information required for the subsequent random access process in the direction of this beam can facilitate the UE to receive and increase the probability of the UE receiving the information.

[0080] In some embodiments, the first parameter is configured according to the third parameter. Specifically, each SSB index is associated with M preamble codes, and there are Q candidate PRACH repetition transmission times in the candidate PRACH repetition transmission times set. Mmod Q = K. K candidate PRACH repetition transmission times in the candidate PRACH repetition transmission times set are associated with P+1 preambles, and other candidate PRACH repetition transmission times in the candidate PRACH repetition transmission times set except the K candidate PRACH repetition transmission times are associated with P preambles, and M and Q are both greater than or equal to 1.

[0081] It can be understood that in the above method, the network side evenly allocates P preamble codes for each candidate PRACH repetition transmission number. When the remaining K preamble codes are not sufficient to support one average allocation, K candidate PRACH repetition transmission numbers are selected from the candidate PRACH repetition transmission numbers, and one more preamble code is allocated to each of the selected K candidate PRACH repetition transmission numbers.

[0082] Through the above method, when the network side performs PRACH detection later, the two pieces of information, the SSB index selected by the UE and the number of PRACH repetition transmissions selected by the UE, are determined based on the received preamble. For UEs that select different SSB indexes, the network side transmits the information required for the subsequent random access process in the beam direction corresponding to the SSB index selected by the UE, thereby avoiding resource conflicts between UEs that select different SSB indexes. Even if different UEs select the same SSB index, if the selected PRACH repetition transmission times are different, the network side can also distinguish UEs that select different PRACH repetition transmission times based on the received preamble, thereby avoiding resource conflicts between UEs that select different PRACH repetition transmission times.

[0083] For example, M = 16, the candidate PRACH repetition transmission times are {2, 4, 8}, and Q = 3. In this case, M mod Q = 1. At this time, the network side associates the candidate PRACH repetition transmission number 2 with 6 preamble codes, and the candidate PRACH repetition transmission numbers 4 and 8 are associated with 5 preamble codes respectively.

[0084] For another example, M = 16, the candidate PRACH repetition transmission times set is {2, 4}, and Q = 2. In this case, M mod Q = 0, at this time the network side associates 8 preamble codes for each candidate PRACH repetition number.

[0085] In some embodiments, the second parameter includes a bit sequence corresponding to each candidate PRACH repetition transmission number. The sequence length of the bit sequence is equal to the maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set, each bit in the bit sequence corresponds to a PRACH transmission opportunity, and the value of each bit in the bit sequence indicates whether to use the corresponding PRACH transmission opportunity for repetition transmission.

[0086] For example, the candidate PRACH repetition transmission number set is {2, 4}. In this case, the second parameter includes two bit sequences corresponding to the candidate PRACH repetition transmission numbers 2 and 4 respectively.

[0087] In the case of configuring the second parameter in the form of a bit sequence, the sequence length of the bit sequence corresponding to each candidate PRACH repetition number is the same, and for each bit number in the bit sequence, whether to use the PRACH transmission opportunity corresponding to the bit number is configured by changing the bit value. The above method can facilitate the network side to configure the PRACH transmission opportunities corresponding to different candidate PRACH repetition numbers, simplify the configuration method, and improve the configuration efficiency. In some implementations, when the value of a bit in the bit sequence is 1, it indicates that the corresponding PRACH transmission opportunity is used for repeated transmission; when the value is 0, it indicates that the corresponding PRACH transmission opportunity is not used for repeated transmission. For example, when the bit sequence "1001" indicates that the number of PRACH repetitions is 2, the UE uses the PRACH transmission opportunities corresponding to the first and fourth bits of the bit sequence to repeatedly transmit the preamble code.

[0088] In some embodiments, configuring the second PRACH transmission resource also includes: configuring a fourth parameter, the fourth parameter being used to indicate the association relationship between each SSB index and multiple PRACH transmission opportunities. Here, the first group of PRACH transmission opportunities includes a second group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number in the PRACH transmission opportunity associated with each SSB index. For example, the candidate PRACH repetition transmission number set is configured as {2}, and the first group of PRACH transmission opportunities associated with the candidate PRACH repetition transmission number 2 includes PRACH transmission opportunities #1, #2, #3 and #4; and the network side is configured with two SSB indexes, namely SSB#0 and SSB#1. In the first group of PRACH transmission opportunities, a second group of PRACH transmission opportunities #1 and #2 associated with SSB index SSB#0 and a second group of PRACH transmission opportunities #3 and #4 associated with SSB#1 are included.

[0089] When the network side performs PRACH detection, it determines the SSB index selected by the UE through the association between the SSB index and multiple PRACH transmission opportunities, and then determines the beam with the best transmission quality selected by the UE, and transmits the information required for the subsequent random access process in the direction of the beam to facilitate UE reception.

[0090] In some embodiments, the maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set does not exceed the number of PRACH transmission opportunities associated with each SSB index.

[0091] In some implementations, the fourth parameter includes a preset value N, when N ≥ 1, it indicates that 1 PRACH transmission opportunity is associated with N SSB indexes; when N ≤ 1, it indicates that 1 SSB is associated with 1 / N second PRACH transmission opportunities. For example, the value of N includes one or more of the following: {1 / 16, 1 / 8, 1 / 4, 1 / 2, 1, 2, 4, 8, 16, 32}.

[0092] In some embodiments, the third parameter is related to the fourth parameter. Since the total number of preamble codes that can be used in each cell is 64, limited by the total number of preamble codes, when N≤1, M≤64; when N>1, M×M≤64 is satisfied. In some embodiments, the network side configures one or more of the first parameter, the second parameter, the third parameter, and the fourth parameter mentioned above.

[0093] The following describes the implementation method of configuring the fourth parameter on the network side in combination with different embodiments.

[0094] In some embodiments, within one association period of the SSB index and the PRACH transmission opportunity, the total number of PRACH transmission opportunities is x, the total number of SSB indexes is l, and the number of PRACH transmission opportunities associated with the same SSB index is y, then

[0095] Combine the following Figure 2 , Figure 3 and Figure 4 This section describes how to configure the association between an SSB index and multiple PRACH transmission opportunities on the network side.

[0096] Figure 2 It is a schematic diagram of the association between the SSB index and the PRACH transmission timing according to some embodiments of the present disclosure.

[0097] like Figure 2 As shown, in one association cycle of SSB and PRACH transmission opportunities, the total number of SSB indexes is l=16, which are SSB#0 to SSB#15 respectively; the total number of PRACH transmission opportunities is x=16, which are PRACH transmission opportunities #0 to #15 respectively. N=4, y=4.

[0098] Divide N SSB indexes into a group in ascending order of SSB index numbers, and 16 SSBs can be divided into 4 groups. Each group of SSB indexes is associated with 4 PRACH transmission opportunities. For example, SSB#0 to SSB#3 are associated with PRACH transmission opportunities #0 to #3; SSB#4 to SSB#7 are associated with PRACH transmission opportunities #4 to #7; SSB#8 to SSB#11 are associated with PRACH transmission opportunities #8 to #11; SSB#12 to SSB#15 are associated with PRACH transmission opportunities #12 to #15.

[0099] In some implementations, the network side configures the second parameter and the fourth parameter at the same time.

[0100] For example, the set of candidate PRACH repetition transmission times configured by the network side is {2,4}. The network side configures the second parameter "1001" for candidate PRACH repetition transmission times 2 and the second parameter "1111" for candidate PRACH repetition transmission times 4. And the association relationship between the configured SSB index and multiple PRACH transmission opportunities is as follows: Figure 2 shown.

[0101] When the UE selects SSB#0 and determines that the number of PRACH repetition transmissions is 2, according to the second parameter "1001" and Figure 2 The association relationship shown. In PRACH transmission opportunities #0 to #3, the UE selects PRACH transmission opportunity #0 corresponding to the first bit in the bit sequence and PRACH transmission opportunity #3 corresponding to the fourth bit to repeat the transmission of the preamble. In the subsequent PRACH detection process, the network side detects the preamble on PRACH transmission opportunities #0 and #3 according to the second parameter.

[0102] When the UE selects SSB#0 and determines that the number of PRACH repetition transmissions is 4, the UE repeatedly transmits the preamble code at PRACH transmission opportunities #0 to #3, and the network side performs PRACH detection at PRACH transmission opportunities #0 to #3.

[0103] For another example, the set of candidate PRACH repetition transmission times configured by the network side is {2,4}. The network side configures the second parameter "1010" for candidate PRACH repetition transmission times 2 and the second parameter "1111" for candidate PRACH repetition transmission times 4. And the association relationship between the configured SSB index and multiple PRACH transmission opportunities is as follows: Figure 2 shown.

[0104] When the UE selects SSB#8 and determines that the number of PRACH repetition transmissions is 2, according to the second parameter "1010" and Figure 2The association relationship shown. In PRACH transmission opportunities #8 to #11, the UE selects PRACH transmission opportunity #8 corresponding to the first bit in the bit sequence and PRACH transmission opportunity #10 corresponding to the third bit to repeat the transmission of the preamble. In the subsequent PRACH detection process, the network side detects the preamble on PRACH transmission opportunities #8 and #10 according to the second parameter.

[0105] Figure 3 It is a schematic diagram of the association relationship between the SSB index and the PRACH transmission timing according to some other embodiments of the present disclosure.

[0106] Figure 4 It is a schematic diagram of the association between the SSB index and the PRACH transmission timing according to some embodiments of the present disclosure.

[0107] according to Figure 3 or Figure 4 As shown, in one association cycle of SSB and PRACH transmission opportunities, the total number of SSB indexes is l=16, which are SSB#0 to SSB#15 respectively; the total number of PRACH transmission opportunities is x=18, which are PRACH transmission opportunities #0 to #18 respectively. N=4, y=4.

[0108] N SSB indexes are divided into 1 group in ascending order of SSB index numbers, and 16 SSBs can be divided into 4 groups. Each group of SSB indexes is associated with 4 PRACH transmission opportunities, and there are 2 PRACH transmission opportunities remaining.

[0109] In some implementations, such as Figure 3 As shown, SSB#0 to SSB#3 are associated with PRACH transmission opportunities #0 to #3; SSB#4 to SSB#7 are associated with PRACH transmission opportunities #4 to #7; SSB#8 to SSB#11 are associated with PRACH transmission opportunities #8 to #11; SSB#12 to SSB#15 are associated with PRACH transmission opportunities #12 to #15, and PRACH transmission opportunities #16 and #17 remain.

[0110] In other implementations, such as Figure 4 As shown, SSB#0 to SSB#3 are associated with PRACH transmission opportunities #0 to #3; SSB#4 to SSB#7 are associated with PRACH transmission opportunities #4 to #7; SSB#8 to SSB#11 are associated with PRACH transmission opportunities #9 to #12; SSB#12 to SSB#15 are associated with PRACH transmission opportunities #13 to #16, and PRACH transmission opportunities #8 and #17 remain.

[0111] In some embodiments, the remaining PRACH transmission opportunities are not used for PRACH repetition transmissions.

[0112] In some embodiments, at least part of the candidate PRACH repetition transmission times indicated by the second parameter includes each PRACH repetition transmission times except the maximum candidate PRACH repetition transmission times. In other words, the second parameter may only indicate part of the candidate PRACH repetition transmission times except the maximum candidate PRACH repetition transmission times. For the maximum candidate PRACH repetition transmission times, the network side does not configure the second parameter. For example, when each SSB is associated with 4 PRACH transmission opportunities, and the set of candidate PRACH repetition transmission times is {2,4}, for the candidate PRACH repetition transmission times 4, the network side does not configure the second parameter. If the UE chooses to repeat the transmission of the preamble 4 times, the preamble is repeated by default on each PRACH transmission opportunity associated with the SSB index selected by the UE. The network side does not configure the second parameter for the maximum candidate PRACH repetition transmission times, which can save configuration resources and configuration time and improve configuration efficiency.

[0113] Figure 5 It is a flowchart of PRACH detection performed on the network side according to some embodiments of the present disclosure.

[0114] In some embodiments, the network side also performs Figure 5 The following steps 502 to 508 are shown.

[0115] In step 502, detection is performed on at least part of PRACH transmission opportunities in the second PRACH transmission resource to obtain a first preamble code repeatedly transmitted by the UE.

[0116] At step 504, a RA-RNTI is determined according to a PRACH transmission opportunity among at least some of the PRACH transmission opportunities.

[0117] In step 506, the first DCI is scrambled using the RA-RNTI to obtain a second DCI.

[0118] In step 508, a second DCI and a RAR scheduled by the second DCI are sent, and the RAR carries the RAPID of the first preamble.

[0119] In this way, the network side can ensure that the UE with single PRACH transmission cannot descramble the DCI corresponding to the UE transmitting the first preamble code, thereby reducing the possibility of resource conflict between the UE with single PRACH transmission and the UE with repeated PRACH transmission.

[0120] In some embodiments, the network side and the UE agree to select a group of PRACH transmission opportunities from multiple PRACH transmission opportunities associated with the SSB index selected by the UE in a positive order or a reverse order. For example, multiple PRACH transmission opportunities associated with the SSB index are as follows: Figure 2. The network side and the UE agree to select some PRACH transmission opportunities in reverse order for PRACH repeated transmission. The UE selects SSB#0 and determines that the number of PRACH repeated transmissions is 2. Then, according to the agreement, the UE repeatedly transmits the preamble code on PRACH transmission opportunities #3 and #2. When detecting the preamble code, the network side also detects in reverse order. For example, it first detects PRACH opportunity #3, then jointly detects PRACH transmission opportunities #2 and #3, then jointly detects PRACH transmission opportunities #3, #2, and #1, and finally detects PRACH transmission opportunities #3, #2, #1, and #0.

[0121] In other embodiments, when a second parameter (used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number in at least some of the candidate PRACH repetition transmission times) is configured on the network side, at least some of the PRACH transmission opportunities detected by the network side include the first group of PRACH transmission opportunities. The network side determines the RA-RNTI based on a PRACH transmission opportunity in the first group of PRACH transmission opportunities. The RA-RNTI determined is different for different PRACH transmission times selected by the UE. The above implementation method can avoid UEs that select different PRACH repetition transmission times from determining the same RA-RNTI, thereby avoiding resource conflicts between UEs that select different PRACH repetition transmission times and reducing the probability of resource conflicts between different UEs.

[0122] In some further embodiments, when the network side configures the second parameter and the fourth parameter (used to indicate the association relationship between each SSB index and multiple PRACH transmission opportunities), the first group of PRACH transmission opportunities includes the second group of PRACH transmission opportunities corresponding to the PRACH transmission opportunities associated with each SSB index, and at least part of the PRACH transmission opportunities detected by the network side includes the second group of PRACH transmission opportunities. The network side determines the RA-RNTI based on a PRACH transmission opportunity in the second group of PRACH transmission opportunities.

[0123] In the above manner, even if the UE selects the same SSB index, as long as the number of PRACH repetition transmissions selected by the UE is different, the RA-RNTI determined by the UE is different. Or although the UE determines the same number of PRACH transmissions, the SSB index selected by the UE is different, and the RA-RNTI finally determined is different. The above implementation method can avoid UEs that select the same SSB index or the same number of PRACH repetition transmissions from determining the same RA-RNTI, thereby further reducing the probability of resource conflicts between different UEs.

[0124] In some embodiments, in order to facilitate the network side and the UE to determine the same RA-RNTI value, the PRACH transmission timing of the UE's last transmission of the preamble code is determined as the basis for calculating the RA-RNTI. The inventors note that among multiple PRACH transmission timings associated with the same SSB index, the first group of PRACH transmission timings associated with each candidate PRACH repetition transmission number may reuse the same PRACH transmission timing. If the basis for calculating the RA-RNTI is determined to be the multiplexed PRACH transmission timing, it may cause UEs that select different PRACH repetition transmission times to determine the same RA-RNTI, which will increase the probability of resource conflicts between UEs that select different PRACH repetition transmission times.

[0125] To solve the above problems, the present disclosure proposes the following solutions.

[0126] In some embodiments, there exists an i such that the i-th PRACH transmission timing in different second groups of PRACH transmission timings in the first group of PRACH transmission timings corresponding to the number of repeated transmissions of each candidate PRACH is different. In this case, the PRACH transmission timing used as the basis for determining the RA-RNTI in step 504 is the i-th PRACH transmission timing. That is, the network side and the UE agree to use the i-th PRACH transmission timing as the basis for determining the RA-RNTI. For UEs that select different second groups of PRACH transmission timings, even if the same preamble is sent, since the i-th PRACH transmission timing for determining the RA-RNTI is different, the RA-RNTI value is also different. The above implementation method can reduce the probability that UEs that select multiple PRACH transmission timings associated with the same SSB index determine the same RA-RNTI, thereby reducing the probability of resource conflicts between different UEs.

[0127] For example, the association between the SSB index and multiple PRACH repetition transmission opportunities is as follows: Figure 2 As shown, the network side configures the candidate PRACH repetition transmission number set as {2, 3, 4}. The network side configures the second parameter "1001" for candidate PRACH repetition transmission number 2; configures the second parameter "1011" for candidate PRACH repetition number 3; and configures the second parameter "1111" for candidate PRACH repetition number 4.

[0128] Among the PRACH transmission opportunities #0 to #3 associated with SSB#0 selected by the UE, the candidate PRACH repetition transmission number 2 corresponds to the first second group PRACH transmission opportunities #0 and #3, the candidate PRACH repetition transmission number 3 corresponds to the second second group PRACH transmission opportunities #0, #2 and #3, and the candidate PRACH repetition number 4 corresponds to the third second group PRACH transmission opportunities #0, #1, #2 and #3.

[0129] For each of the above second group PRACH repeated transmission opportunities, the second PRACH transmission opportunity is different. The second PRACH transmission opportunity of the first second group PRACH transmission opportunity is #3; the second PRACH transmission opportunity of the second second group PRACH transmission opportunity is #2; the second PRACH transmission opportunity of the third second group PRACH transmission opportunity is #1. The UE and the network side agree to use the second PRACH transmission opportunity as the basis for determining the RA-RNTI.

[0130] In some embodiments, multiple PRACH transmission opportunities associated with each SSB index do not overlap in the time domain. When PRACH transmission is performed in different frequency domains in the same time domain, since frequency division will reduce the transmission power in each frequency domain, it is not conducive to the network side to detect the preamble code, and repeated transmission of the preamble code in the time domain will not reduce the transmission power, and can also increase the probability of the preamble code being detected. Therefore, the network side configures multiple PRACH transmission opportunities associated with the same SSB index to not overlap in the time domain, which is conducive to improving the probability of successful PRACH transmission, thereby improving the coverage performance of PRACH.

[0131] In some embodiments, the network side configures multiple PRACH transmission opportunities associated with the same SSB index to be non-overlapping and continuously arranged in the time domain, which can facilitate PRACH detection on the network side. Figure 2 As shown, PRACH transmission opportunities #4, #5, #6 and #7 associated with SSB #5 do not overlap in the time domain and are arranged continuously in the time domain.

[0132] In some embodiments, the network side also sends configuration information, where the configuration information indicates a first PRACH transmission resource that is only used for a single PRACH transmission and a second PRACH transmission resource that is only used for repeated PRACH transmission.

[0133] The network side notifies the UE of the configuration of the first PRACH transmission resource and the second PRACH transmission resource by sending configuration information, so that the UE can select any one of the PRACH transmission resources according to the configuration information to implement PRACH transmission.

[0134] In some embodiments, any one of the above-mentioned configuration conditions of the second PRACH transmission resource on the network side may be carried in the configuration information.

[0135] In some embodiments, the network side configures a first PRACH transmission resource for a single PRACH transmission. The PRACH configuration information related to the first PRACH transmission resource is indicated by the prach-ConfigurationIndex of the system information block (System Information Block, SIB) 1. The value of this parameter is an index value of 0 to 255, corresponding to the row index in the random access configuration table, and specifically indicates the following information: preamble format, system frame number, subframe number, starting orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol position, the number of time slots used to transmit PRACH in a subframe, the number of PRACH time domain transmission opportunities in a PRACH time slot, and the number of continuous symbols of PRACH.

[0136] For example, a system frame has a length of 10 ms, each system frame includes 10 subframes, each subframe has a length of 1 ms, each subframe includes one or more time slots, and each time slot consists of a plurality of consecutive OFDM symbols.

[0137] The format of the preamble code used for a single transmission, the time domain position of the PRACH transmission opportunity used for a single transmission, and the number of PRACH transmission opportunities in the time domain can be determined through the above information.

[0138] In some embodiments, the number of PRACH transmission opportunities in the frequency domain of the first PRACH transmission resource may be indicated by a parameter msg1-FDM, which may be configured as {1,2,4,8}. For example, when the parameter is configured as 1, it indicates that there is 1 PRACH transmission opportunity in the frequency domain.

[0139] The total number of PRACH transmission opportunities of the first PRACH transmission resource may be determined according to the number of PRACH transmission opportunities of the first PRACH in the time domain and the number of transmission opportunities of the first PRACH in the frequency domain.

[0140] In some embodiments, the network side indicates the number of PRACH transmission opportunities associated with the SSB index and the number of preambles corresponding to each SSB index by configuring the parameter ssb-perRACH-Occasion AndCB-PreamblesPerSSB. The above parameters are used to indicate the number of preambles used in the contention-based random access process.

[0141] In the parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB, the parameter ssb-perRACH-Occasion indicates the number of PRACH transmission opportunities associated with each SSB index, and its values ​​include {oneEighth, oneFourth, oneHalf, one, two, four, eight, sixteen}. For example, when the parameter ssb-perRACH-Occasion takes the value of oneHalf (1 / 2), it means that 1 SSB index is associated with 2 PRACH transmission opportunities; when the parameter ssb-perRACH-Occasion takes the value of two (2), it means that 2 SSB indexes are associated with 1 PRACH transmission opportunity.

[0142] In the parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB, the parameter CB-PreamblesPerSSB indicates the number of preambles corresponding to each SSB index. In some implementations, when the value of the parameter ssb-perRACH-OccasionAndCB-Preambles PerSSB is oneHalf{n4}, it means that one SSB index is associated with two PRACH transmission opportunities, and each SSB index corresponds to four competing preambles.

[0143] According to the above description, each SSB index is associated with at least one PRACH transmission opportunity, and the base station can indirectly obtain the information of the SSB index selected by the UE by detecting the PRACH transmission opportunity adopted by the UE.

[0144] In some embodiments, when N SSB indexes are configured on the network side, the N SSB indexes will be associated with the corresponding PRACH transmission opportunities one by one according to certain rules. After each of the N SSBs is associated with a PRACH transmission opportunity, one round of association is considered to be completed. If there are remaining PRACH transmission opportunities, the N SSB indexes will continue to be associated with the remaining PRACH transmission opportunities until the remaining PRACH transmission opportunities are insufficient to support a full round of SSB index association mapping. In some embodiments, the last remaining PRACH transmission opportunity does not perform PRACH transmission.

[0145] In some embodiments, the RA-RNTI is calculated based on the following parameters: the first OFDM symbol index of the second PRACH transmission opportunity, the first time slot index of the second PRACH transmission opportunity in a system frame, the index of the second PRACH transmission opportunity in the frequency domain, and the uplink carrier ID used for random access (for a normal uplink carrier, the value is 0; for a supplementary uplink carrier, the value is 1). The first three of the above parameters are determined by the time-frequency position of the second PRACH transmission opportunity.

[0146] Figure 6 It is a flowchart of a PRACH repeated transmission method according to some other embodiments of the present disclosure.

[0147] In step 602, the UE receives configuration information, where the configuration information indicates a first PRACH transmission resource used only for a single PRACH transmission and a second PRACH transmission resource used only for repeated PRACH transmission.

[0148] In step 604, the UE transmits a preamble according to the configuration information.

[0149] For example, when the UE performs PRACH single transmission, the preamble code is transmitted on the first PRACH transmission opportunity in the first PRACH transmission resource used only for PRACH single transmission.

[0150] For another example, when the UE performs PRACH repetition transmission, the preamble code is transmitted on the second PRACH transmission opportunity in the second PRACH transmission resource used only for PRACH repetition transmission.

[0151] The UE may implement PRACH single transmission or PRACH repeated transmission according to the configuration information, and use different PRACH transmission resources when performing PRACH single transmission and PRACH repeated transmission, thereby reducing the probability of resource conflict between PRACH single transmission and PRACH repeated transmission.

[0152] The implementation of step 604 is described below in conjunction with different embodiments.

[0153] In some embodiments, the configuration information also includes a set of candidate PRACH repetition transmission times supported by the network side. In this case, transmitting the preamble code according to the configuration information in step 604 includes: determining a PRACH repetition transmission number m in the candidate PRACH repetition transmission number set; and repeatedly transmitting the first preamble code m times using the second PRACH transmission resource. The UE can select the PRACH repetition transmission number in the candidate PRACH repetition transmission number set according to demand, which helps to reduce resource waste.

[0154] In some embodiments, the configuration information also includes at least one of a first parameter and a second parameter, the first parameter being used to indicate an association between each candidate PRACH repetition transmission number and a preamble code; and the second parameter being used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number among at least some of the candidate PRACH repetition transmission numbers.

[0155] When the configuration information includes the first parameter, the UE transmits a preamble code associated with the number of PRACH repeated transmissions selected by the UE according to the indication of the first parameter, which helps to reduce the probability of resource conflict between the UE performing PRACH repeated transmission and the UE performing PRACH single transmission.

[0156] In the case where the configuration information includes the second parameter, a first group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m is determined according to the second parameter; and the first preamble code is repeatedly transmitted m times on the first group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m.

[0157] When the second parameter is configured on the network side, the UE performs PRACH repetition transmission on the first group of PRACH repetition transmission opportunities associated with the PRACH repetition transmission number m, which helps to reduce the probability of resource conflict between the UE performing PRACH repetition transmission and the UE performing PRACH single transmission.

[0158] In some embodiments, different candidate PRACH repetition transmission times are associated with different preambles. Selecting UEs with different candidate PRACH repetition transmission times to transmit preambles can avoid resource conflicts between UEs that select different PRACH repetition transmissions.

[0159] In some embodiments, the configuration information also includes a third parameter, which is used to indicate the association relationship between each SSB index and the preamble code, and the first preamble code belongs to the preamble code associated with an SSB index selected by the UE.

[0160] In some embodiments, the first parameter is configured according to the third parameter, and the specific configuration method is described above. In this case, the first preamble belongs to the preamble associated with the number of PRACH repetition transmissions m among the M preambles associated with the SSB index selected by the UE.

[0161] For example, M = 16, the candidate PRACH repetition transmission times are {2, 4, 8}, and Q = 3. In this case, M mod Q = 1, candidate PRACH repetition transmission number 2 is associated with 6 preambles, and candidate PRACH repetition transmission numbers 4 and 8 are associated with 5 preambles respectively. If the PRACH repetition transmission number m selected by the UE is 2, the first preamble sent by the UE is one of the 6 preambles associated with candidate PRACH repetition transmission number 2.

[0162] In the above manner, the preamble sent by the UE belongs to the preamble associated with the PRACH repetition transmission number m selected by the UE. When the network side receives the first preamble, it can not only determine the PRACH repetition transmission number m, but also determine the SSB index selected by the UE. This facilitates the network side to distinguish UEs that select different SSB indexes or different PRACH repetition transmission times.

[0163] In some embodiments, the configuration information also includes a fourth parameter. In this case, the UE repeats the transmission of the first preamble m times on the second group of PRACH transmission opportunities corresponding to the number of PRACH repetition transmissions m among the multiple PRACH transmission opportunities associated with the selected SSB index. The UE repeats the transmission of the preamble specified by the network side on the PRACH repetition transmission opportunity specified by the network side. In the above case, the network side can determine the number of PRACH repetition transmissions selected by the UE based on any one of the information in the received preamble or the second group of PRACH transmission opportunities for receiving the preamble, and verify whether the determined number of PRACH repetition transmissions is correct based on another information.

[0164] In some embodiments, after sending the preamble code, the UE also performs the following steps: receiving a second DCI; determining the RA-RNTI based on a PRACH transmission timing in the first group of PRACH transmission timings corresponding to the number of PRACH repetition transmissions m; using the RA-RNTI to descramble the second DCI to obtain the first DCI; and receiving the RAR based on the first DCI.

[0165] After sending the preamble, the UE monitors the PDCCH within the RAR time window. The PDCCH is used to carry the second DCI sent by the network side. The UE monitors the PDCCH to receive the second DCI. The second DCI is obtained by scrambling the first DCI with the RA-RNTI on the network side. In order for the UE to successfully receive the RAR sent by the network side to the UE, the RA-RNTI value determined by the UE must be the same as that on the network side. Therefore, when the UE selects a group of PRACH transmission opportunities, according to the pre-agreement with the network side, a PRACH transmission opportunity is selected from the first group of PRACH transmission opportunities corresponding to the number of PRACH repetition transmissions m to determine the RA-RNTI.

[0166] In some embodiments, the configuration information further includes a fourth parameter. In this case, a PRACH transmission opportunity for determining the RA-RNTI belongs to a second group of PRACH transmission opportunities corresponding to the number of PRACH repetition transmissions m in the first group of PRACH transmission opportunities associated with the SSB index selected by the UE.

[0167] In some embodiments, when the fourth parameter is configured on the network side, there is an i such that the i-th PRACH transmission opportunity in each second group of PRACH transmission opportunities is different, and one PRACH transmission opportunity is the i-th PRACH transmission opportunity. That is, one PRACH transmission opportunity for determining the RA-RNTI value is the i-th PRACH transmission opportunity. The above implementation method can reduce the probability that UEs that select multiple PRACH transmission opportunities associated with the same SSB index determine the same RA-RNTI, thereby reducing the probability of resource conflicts between different UEs.

[0168] In some embodiments, the UE performs a subsequent random access procedure when the RAR carries the RAPID of the first preamble. In some embodiments, the RAR includes information required by the UE to perform a subsequent random access procedure.

[0169] For other embodiments of the above-mentioned PRACH repeated transmission method applied to the UE, please refer to the above-mentioned embodiment of the PRACH repeated transmission method applied to the network side, which will not be described in detail here.

[0170] Figure 7 It is a structural diagram of a PRACH repeated transmission device according to some embodiments of the present disclosure, and the device is applied to the network side.

[0171] like Figure 7 As shown, the PRACH repeated transmission device includes a configuration module 701.

[0172] The configuration module 701 is configured to configure a first PRACH transmission resource and a second PRACH transmission resource, the first PRACH transmission resource is only used for a single PRACH transmission, and the second PRACH transmission resource is only used for repeated PRACH transmission.

[0173] It should be understood that the above-mentioned PRACH repeated transmission device may also include other modules to execute the PRACH repeated transmission method applied to the network side of any one of the above-mentioned embodiments.

[0174] Figure 8 It is a structural diagram of a PRACH repeated transmission device according to some other embodiments of the present disclosure, and the device is applied to a UE.

[0175] like Figure 8As shown, the PRACH transmission device includes a receiving module 801 and a transmission module 803.

[0176] The receiving module 801 is configured to receive configuration information, where the configuration information indicates a first PRACH transmission resource used only for a single PRACH transmission and a second PRACH transmission resource used only for repeated PRACH transmission.

[0177] The transmission module 803 is configured to transmit the preamble code according to the configuration information.

[0178] It should be understood that the above-mentioned PRACH repeated transmission device may also include other modules to execute the PRACH repeated transmission method applied to UE in any one of the above-mentioned embodiments.

[0179] For other embodiments of the above-mentioned PRACH repeated transmission device, please refer to the embodiment of the PRACH repeated transmission method above, which will not be described in detail here.

[0180] Fig. 9 It is a structural diagram of a PRACH transmission device according to some further embodiments of the present disclosure.

[0181] like Fig. 9 As shown, the PRACH transmission device 900 includes a memory 901 and a processor 902 coupled to the memory 901, and the processor 902 is configured to execute any one of the aforementioned methods of the embodiments applied to the network side or the UE based on the instructions stored in the memory 901.

[0182] The memory 901 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs.

[0183] The PRACH repetitive transmission device 900 may also include an input / output interface 903, a network interface 904, a storage interface 905, etc. These interfaces 903, 904, 905, and the memory 901 and the processor 902 may be connected, for example, via a bus 906. The input / output interface 603 provides a connection interface for input / output devices such as a display, a mouse, a keyboard, and a touch screen.

[0184] In some embodiments, the present disclosure further proposes a base station, which includes a PRACH repetition transmission device in any one of the above embodiments, for example Figure 7 or Fig. 9 The PRACH repetition transmission device is shown.

[0185] In some embodiments, the present disclosure further proposes a UE, which includes a PRACH repetitive transmission device of any one of the above embodiments, such as Figure 8 or Fig. 9 The PRACH repetition transmission device is shown.

[0186] Fig.10 It is a structural diagram of a PRACH repeated transmission system according to some embodiments of the present disclosure, and the PRACH repeated transmission system includes a base station 1001 and a UE 1002.

[0187] The embodiments of the present disclosure further provide a computer-readable storage medium, comprising computer program instructions, which implement the method of any one of the above embodiments when executed by a processor.

[0188] The embodiments of the present disclosure further provide a computer program product, including a computer program, which implements the method of any one of the above embodiments when executed by a processor.

[0189] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0190] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0191] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0192] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present disclosure. It should be understood that the functions specified in one or more processes in the flowchart and / or one or more blocks in the block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the functions specified in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0193] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0194] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0195] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A method for repeated transmission of a physical random access channel (PRACH), applied to a network side, comprising: Configure a first PRACH transmission resource and a second PRACH transmission resource, wherein the first PRACH transmission resource is only used for a single PRACH transmission, and the second PRACH transmission resource is only used for repeated PRACH transmission; The configuring the second PRACH transmission resource includes: A set of candidate PRACH repetition transmission times supported by the network side and a first parameter are configured, where the first parameter is used to indicate an association between each candidate PRACH repetition transmission time and a preamble code.

2. The method according to claim 1, wherein: Configuring the second PRACH transmission resource also includes: A second parameter is configured, where the second parameter is used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number in at least some of the candidate PRACH repetition transmission numbers.

3. The method according to claim 2, wherein: The at least part of the candidate PRACH repetition transmission times includes each PRACH repetition transmission time except the maximum candidate PRACH repetition transmission time.

4. The method according to claim 1, wherein: The preamble codes associated with different candidate PRACH repetition transmission times are different.

5. The method according to any one of claims 1 to 4, wherein: Configuring the second PRACH transmission resource also includes: Configure a third parameter, where the third parameter is used to indicate an association relationship between each SSB index and the preamble code.

6. The method according to claim 5, wherein: The first parameter is configured according to the third parameter, each SSB index is associated with M preamble codes, and the candidate PRACH repetition transmission number set has Q candidate PRACH repetition transmission numbers, , M mod Q=K, the K candidate PRACH repetition transmission times in the candidate PRACH repetition transmission time set are associated with P+1 preamble codes, and the other candidate PRACH repetition transmission times in the candidate PRACH repetition transmission time set except the K candidate PRACH repetition transmission times are associated with P preamble codes, and M and Q are both greater than or equal to 1.

7. The method according to any one of claims 2 to 3, wherein: The second parameter includes a bit sequence corresponding to each candidate PRACH repetition transmission number, the sequence length of the bit sequence is equal to the maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set, each bit in the bit sequence corresponds to a PRACH transmission opportunity, and the value of each bit in the bit sequence indicates whether the corresponding PRACH transmission opportunity is used for repeated transmission.

8. The method according to claim 7, wherein: When the value is 1, it indicates that the corresponding PRACH transmission opportunity is used for repeated transmission; when the value is 0, it indicates that the corresponding PRACH transmission opportunity is not used for repeated transmission.

9. The method according to any one of claims 2 to 3, wherein: Configuring the second PRACH transmission resource also includes: Configure a fourth parameter, wherein the fourth parameter is used to indicate an association relationship between each SSB index and multiple PRACH transmission opportunities, wherein the first group of PRACH transmission opportunities includes a second group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number among at least part of the candidate PRACH repetition transmission numbers in the multiple PRACH transmission opportunities associated with each SSB index.

10. The method according to any one of claims 1 to 4, further comprising: Perform detection on at least part of the PRACH transmission opportunities in the second PRACH transmission resource to obtain a first preamble code repeatedly transmitted by a user equipment UE; Determine a random access radio network temporary identifier, RA-RNTI, according to one of the at least some PRACH transmission opportunities; Scrambling the first downlink control information DCI by using the RA-RNTI to obtain a second DCI; The second DCI and a random access response RAR scheduled by the second DCI are sent, where the RAR carries a random access preamble identifier RAPID of the first preamble.

11. The method according to claim 10, wherein: Configuring the second PRACH transmission resource also includes: configuring a second parameter, where the second parameter is used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number in at least some of the candidate PRACH repetition transmission numbers; The at least part of the PRACH transmission opportunities includes the first group of PRACH transmission opportunities.

12. The method according to claim 11, wherein: Configuring the second PRACH transmission resource also includes: Configure a fourth parameter, where the fourth parameter is used to indicate an association relationship between each SSB index and a plurality of PRACH transmission opportunities, where the first group of PRACH transmission opportunities includes a second group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number of at least part of the candidate PRACH repetition transmission numbers in the plurality of PRACH transmission opportunities associated with each SSB; The at least part of the PRACH transmission opportunities includes the second group of PRACH transmission opportunities.

13. The method according to claim 12, wherein: There exists an i such that the i-th PRACH transmission timings in the first group of PRACH transmission timings are different from those in the second group of PRACH transmission timings, and the one PRACH transmission timing is the i-th PRACH transmission timing.

14. The method according to claim 9, wherein: The multiple PRACH transmission opportunities associated with each SSB index do not overlap in the time domain.

15. The method according to claim 14, wherein: Multiple PRACH transmission opportunities associated with each SSB index are arranged continuously in the time domain.

16. The method according to any one of claims 1 to 4, wherein: The maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set does not exceed the number of multiple PRACH transmission opportunities associated with each SSB index.

17. A PRACH repeated transmission method, applied to a network side, comprising: Send configuration information, wherein the configuration information indicates a first PRACH transmission resource used only for a single PRACH transmission and a second PRACH transmission resource used only for repeated PRACH transmissions, the configuration information also including a set of candidate PRACH repeated transmission times supported by the network side and a first parameter, wherein the first parameter is used to indicate an association between each candidate PRACH repeated transmission time and a preamble code.

18. A PRACH repeated transmission method, applied to a UE, comprising: Receive configuration information, the configuration information indicating a first PRACH transmission resource used only for a single PRACH transmission and a second PRACH transmission resource used only for repeated PRACH transmissions, the configuration information further comprising a set of candidate PRACH repeated transmission times supported by the network side and a first parameter, the first parameter being used to indicate an association relationship between each candidate PRACH repeated transmission time and a preamble; Transmitting a preamble according to the configuration information includes: determining a PRACH repetition transmission number m in the candidate PRACH repetition transmission number set; The first preamble code is repeatedly transmitted m times using the second PRACH transmission resource.

19. The method according to claim 18, wherein: The preamble codes associated with different candidate PRACH repetition transmission times are different.

20. The method according to claim 18, wherein: The configuration information further includes a second parameter, wherein the second parameter is used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition transmission number in at least part of the candidate PRACH repetition transmission numbers; The repeatedly transmitting the first preamble m times using the second PRACH transmission resource comprises: Determine a first group of PRACH transmission opportunities corresponding to the number of PRACH repetition transmissions m according to the second parameter; Repeatedly transmit the first preamble m times on a first group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m; The first preamble code is a preamble code associated with the PRACH repetition transmission number m.

21. The method according to claim 20, wherein: The at least part of the candidate PRACH repetition transmission times includes each PRACH repetition transmission time except the maximum candidate PRACH repetition transmission time.

22. The method according to claim 20, wherein: The configuration information also includes a third parameter, which is used to indicate the association relationship between each SSB index and the preamble code, and the first preamble code belongs to the preamble code associated with an SSB index selected by the UE.

23. The method of claim 22, wherein: The first parameter is configured according to the third parameter, each SSB index is associated with M preamble codes, and the candidate PRACH repetition transmission number set has Q candidate PRACH repetition transmission numbers, , M mod Q = K, K candidate PRACH repetition transmission times in the candidate PRACH repetition transmission times set are associated with P+1 preambles, and other candidate PRACH repetition transmission times in the candidate PRACH repetition transmission times set except the K candidate PRACH repetition transmission times are associated with P preambles, and M and Q are both greater than or equal to 1; The first preamble code belongs to the preamble code associated with the PRACH repetition transmission number m among the M preamble codes associated with the SSB index selected by the UE.

24. The method according to any one of claims 20 to 23, wherein: The second parameter includes a bit sequence corresponding to each candidate PRACH repetition transmission number, the sequence length of the bit sequence is equal to the maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set, each bit in the bit sequence corresponds to a PRACH transmission opportunity, and the value of each bit in the bit sequence indicates whether the corresponding PRACH transmission opportunity is used for repeated transmission.

25. The method according to claim 24, wherein: When the value is 1, it indicates that the corresponding PRACH transmission opportunity is used for repeated transmission; when the value is 0, it indicates that the corresponding PRACH transmission opportunity is not used for repeated transmission.

26. The method according to any one of claims 20 to 23, wherein: The configuration information further includes a fourth parameter, where the fourth parameter is used to indicate an association relationship between each SSB index and a plurality of PRACH transmission opportunities, where the first group of PRACH transmission opportunities includes a second group of PRACH transmission opportunities corresponding to each PRACH repetition transmission number of at least part of the candidate PRACH repetition transmission numbers in the plurality of PRACH transmission opportunities associated with each SSB index; The repeatedly transmitting the first preamble m times on the first group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m includes: Among multiple PRACH transmission opportunities associated with an SSB index selected by the UE, the first preamble code is repeatedly transmitted m times on a second group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m.

27. The method according to claim 26, wherein: The multiple PRACH transmission opportunities associated with each SSB index do not overlap in the time domain.

28. The method according to claim 27, wherein: Multiple PRACH transmission opportunities associated with each SSB index are arranged continuously in the time domain.

29. The method according to any one of claims 18 to 23, wherein: The maximum candidate PRACH repetition transmission number in the candidate PRACH repetition transmission number set does not exceed the number of multiple PRACH transmission opportunities associated with each SSB index.

30. The method according to any one of claims 20 to 23, further comprising: receiving a second DCI; Determine the RA-RNTI according to a PRACH transmission opportunity in the first group of PRACH transmission opportunities corresponding to the PRACH repetition transmission number m; Descrambling the second DCI using the RA-RNTI to obtain a first DCI; A RAR is received according to the first DCI.

31. The method of claim 30, wherein: The configuration information further includes a fourth parameter, where the fourth parameter is used to indicate an association relationship between each SSB index and a plurality of PRACH transmission opportunities, where the first group of PRACH transmission opportunities includes a second group of PRACH transmission opportunities corresponding to each number of PRACH repetition transmissions in the PRACH transmission opportunities associated with each SSB index; The one PRACH transmission opportunity belongs to a second group of PRACH transmission opportunities corresponding to the number of PRACH repetition transmissions m, among multiple PRACH transmission opportunities associated with the SSB index selected by the UE.

32. The method according to claim 31, wherein: There exists an i such that the i-th PRACH transmission opportunity in each second group of PRACH transmission opportunities is different, and the one PRACH transmission opportunity is the i-th PRACH transmission opportunity.

33. The method of claim 30, further comprising: In a case where the RAR carries the RAPID of the first preamble code, a subsequent random access procedure is performed.

34. A PRACH repeated transmission device, applied to a network side, comprising: A configuration module, configured to configure a first PRACH transmission resource and a second PRACH transmission resource, wherein the first PRACH transmission resource is only used for a single PRACH transmission, and the second PRACH transmission resource is only used for repeated PRACH transmission; The configuration module is configured to configure a set of candidate PRACH repetition transmission times supported by the network side and a first parameter, wherein the first parameter is used to indicate an association relationship between each candidate PRACH repetition transmission time and a preamble code.

35. A PRACH repeated transmission device, applied to a network side, comprising: Memory; as well as A processor coupled to the memory, configured to execute the method of any one of claims 1-17 based on instructions stored in the memory.

36. A PRACH repeated transmission device, applied to UE, comprising: A receiving module is configured to receive configuration information, wherein the configuration information indicates a first PRACH transmission resource used only for a single PRACH transmission and a second PRACH transmission resource used only for repeated PRACH transmissions, wherein the configuration information further includes a set of candidate PRACH repeated transmission times supported by the network side and a first parameter, wherein the first parameter is used to indicate an association relationship between each candidate PRACH repeated transmission time and a preamble code; A transmission module is configured to transmit a preamble according to the configuration information, including: determining a PRACH repetition transmission number m in the candidate PRACH repetition transmission number set; The first preamble code is repeatedly transmitted m times using the second PRACH transmission resource.

37. A PRACH repeated transmission device, applied to UE, comprising: Memory; as well as A processor coupled to the memory is configured to execute the method of any one of claims 18-33 based on instructions stored in the memory.

38. A base station, comprising: An apparatus as claimed in claim 34 or claim 35.

39. A user equipment comprising: An apparatus as claimed in claim 36 or claim 37.

40. A PRACH repeated transmission system, comprising: The base station as claimed in claim 38 and the user equipment as claimed in claim 39.

41. A computer-readable storage medium comprising computer program instructions, wherein: When the computer program instructions are executed by a processor, the method described in any one of claims 1-17 or 18-33 is implemented.

42. A computer program product comprising a computer program, wherein: When the computer program is executed by a processor, the method according to any one of claims 1 to 17 or 18 to 33 is implemented.

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