Prach repetition transmission 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, relating to the technical field of wireless communication, the method comprises: configuring a first PRACH transmission resource and a second PRACH transmission resource, the first PRACH transmission resource is only used for PRACH single transmission, and the second PRACH transmission resource is only used for PRACH repeated transmission.

Description

[0001] This application is a divisional application of the original application with application number 202211101995.1 (filed on September 9, 2022, entitled "PRACH Repeated Transmission Method, Apparatus, System and Computer-Readable Storage Medium"). Technical Field

[0002] This disclosure relates to the field of wireless communication technology, and in particular to a method, apparatus, system, and computer-readable storage medium for repeated transmission of a Physical Random Access Channel (PRACH). Background Technology

[0003] The 3GPP NR Realease-17 protocol does not yet support repeated PRACH transmissions. According to the current protocol version, the User Equipment (UE) calculates the Random Access-Radio Network Temporary Identifier (RA-RNTI) based on the timing of the PRACH transmission of the preamble, and listens on the Physical Downlink Control Channel (PDCCH) within the Random Access Response (RAR) time window. If the RA-RNTI successfully descrambles the listened-to Downlink Control Information (DCI), and the UE receives the Random Access Preamble Identifier (RAPID) corresponding to the preamble sent by the UE according to the DCI's scheduling, then the PRACH transmission is considered successful. If unsuccessful, the UE needs to re-transmit the PRACH, which not only causes additional latency but also wastes PRACH transmission resources. Summary of the Invention

[0004] The inventors noted that to achieve PRACH retransmission, PRACH transmission resources need to be configured for PRACH retransmission. Reusing existing PRACH transmission resources intended for single PRACH transmissions increases the probability of PRACH transmission collisions.

[0005] To address the aforementioned problems, the present disclosure proposes the following solutions.

[0006] According to one aspect of the present disclosure, a PRACH retransmission method is provided, applied to the network side, comprising: configuring a first PRACH transmission resource and a second PRACH transmission resource, wherein the first PRACH transmission resource is used only for single PRACH transmission and the second PRACH transmission resource is used only for retransmission of PRACH.

[0007] In some embodiments, configuring the second PRACH transport resource includes configuring a set of candidate PRACH repeat transmission counts supported by the network side.

[0008] In some embodiments, configuring the second PRACH transmission resource further includes configuring at least one of a first parameter and a second parameter, wherein the first parameter is used to indicate the association between the number of repeated transmissions of each candidate PRACH and the preamble, and the second parameter is used to indicate the first group of PRACH transmission timings corresponding to each candidate PRACH repeated transmission number among at least a portion of the candidate PRACH repeated transmission numbers.

[0009] In some embodiments, the number of repeated transmissions of at least some candidate PRACHs includes the number of repeated transmissions of each PRACH other than the number of repeated transmissions of the largest candidate PRACH.

[0010] In some embodiments, the preamble associated with different numbers of PRACH retransmissions for different candidates is different.

[0011] In some embodiments, configuring the second PRACH transport resource further includes configuring a third parameter, the third parameter being used to indicate the association between each SSB index and the preamble.

[0012] In some embodiments, the first parameter is configured according to the third parameter, each SSB index is associated with M preambles, and the candidate PRACH repeat transmission count set contains Q candidate PRACH repeat transmission counts. M mod Q = K, the number of repeated transmissions of K candidate PRACHs in the candidate PRACH repeated transmission count set is associated with P+1 preambles, and the number of repeated transmissions of other candidate PRACHs in the candidate PRACH repeated transmission count set other than the K candidate PRACH repeated transmission counts is associated with P preambles, and M and Q are both greater than or equal to 1.

[0013] In some embodiments, the second parameter includes a bit sequence corresponding to the number of times each candidate PRACH is repeated, the sequence length of the bit sequence being equal to the maximum number of times the candidate PRACH is repeated in the set of candidate PRACH repeated transmissions, each bit in the bit sequence corresponding to a PRACH transmission opportunity, and the value of each bit in the bit sequence indicating whether to use the corresponding PRACH transmission opportunity for repeated transmission.

[0014] In some embodiments, when the value is 1, it indicates that the corresponding PRACH transmission timing is used for repeated transmission; when the value is 0, it indicates that the corresponding PRACH transmission timing is not used for repeated transmission.

[0015] In some embodiments, configuring the second PRACH transmission resource further includes configuring a fourth parameter, the fourth parameter being used to indicate the association 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 count among the at least some candidate PRACH repetition counts among the multiple PRACH transmission opportunities associated with each SSB index.

[0016] In some embodiments, the method further includes: detecting at least a portion of the PRACH transmission opportunities in the second PRACH transmission resources to obtain a first preamble that is repeatedly transmitted by the user equipment (UE); determining a random access radio network temporary identifier (RA-RNTI) based on one of the PRACH transmission opportunities in the at least a portion of the PRACH transmission opportunities; scrambling a first downlink control information (DCI) using the RA-RNTI to obtain a second DCI; and sending the second DCI and a random access response (RAR) scheduled by the second DCI, wherein the RAR carries a random access preamble identifier (RAPID) of the first preamble.

[0017] In some embodiments, configuring the second PRACH transmission resource further includes configuring a second parameter, the second parameter being used to indicate a first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition number in at least a portion of the candidate PRACH repetition transmission numbers; wherein the at least a portion of the PRACH transmission opportunities includes the first group of PRACH transmission opportunities.

[0018] In some embodiments, configuring the second PRACH transmission resource further includes configuring a fourth parameter, the fourth parameter being used to indicate the association 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 number in the at least some candidate PRACH repetition numbers among the multiple PRACH transmission opportunities associated with each SSB; wherein the at least some PRACH transmission opportunities include the second group of PRACH transmission opportunities.

[0019] In some embodiments, there exists an i such that the i-th PRACH transmission timing is different in the first group of PRACH transmission timings and different in the second group of PRACH transmission timings, and the i-th PRACH transmission timing is the i-th PRACH transmission timing.

[0020] In some embodiments, the timing of multiple PRACH transmissions associated with each SSB index does not overlap in the time domain.

[0021] In some embodiments, the multiple PRACH transmission opportunities associated with each SSB index are arranged consecutively in the time domain.

[0022] In some embodiments, the maximum number of candidate PRACH repeat transmissions in the candidate PRACH repeat transmission count set does not exceed the number of multiple PRACH transmission opportunities associated with each SSB index.

[0023] According to another aspect of the embodiments of this disclosure, a PRACH retransmission method is provided, applied to the network side, comprising: 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 retransmission of PRACH.

[0024] According to another aspect of the present disclosure, a PRACH retransmission method is provided, applied to a UE, comprising: receiving configuration information, the configuration information indicating a first PRACH transmission resource for single PRACH transmission only and a second PRACH transmission resource for retransmission only; and transmitting a preamble according to the configuration information.

[0025] In some embodiments, the configuration information further includes a set of candidate PRACH retransmission counts supported by the network side; transmitting the preamble according to the configuration information includes: determining a PRACH retransmission count m from the set of candidate PRACH retransmission counts; and retransmitting the first preamble m times using the second PRACH transmission resource.

[0026] In some embodiments, the configuration information further includes at least one of a first parameter and a second parameter, wherein the first parameter is used to indicate the association between the number of times each candidate PRACH is repeatedly transmitted and the preamble, and the second parameter is used to indicate the first group of PRACH transmission opportunities corresponding to each candidate PRACH repeat transmission number among at least a portion of the candidate PRACH repeat transmission numbers; the step of repeatedly transmitting the first preamble m times using the second PRACH transmission resource includes: when the configuration information includes the second parameter, determining the first group of PRACH transmission opportunities corresponding to the number of times PRACH is repeatedly transmitted m times according to the second parameter; repeatedly transmitting the first preamble m times at the first group of PRACH transmission opportunities corresponding to the number of times PRACH is repeatedly transmitted m times; when the configuration information includes the first parameter, the first preamble belongs to the preamble associated with the number of times PRACH is repeatedly transmitted m.

[0027] In some embodiments, the number of repeated transmissions of at least some candidate PRACHs includes the number of repeated transmissions of each PRACH other than the number of repeated transmissions of the largest candidate PRACH.

[0028] In some embodiments, the configuration information further includes a third parameter, which indicates the association between each SSB index and a preamble, wherein the first preamble belongs to a preamble associated with an SSB index selected by the UE.

[0029] In some embodiments, the first parameter is configured according to the third parameter, each SSB index is associated with M preambles, and the candidate PRACH repeat transmission count set contains Q candidate PRACH repeat transmission counts. M mod Q = K, the K candidate PRACH retransmission counts in the candidate PRACH retransmission count set are associated with P+1 preambles, and the other candidate PRACH retransmission counts in the candidate PRACH retransmission count set besides the K candidate PRACH retransmission counts are associated with P preambles, where M and Q are both greater than or equal to 1; the first preamble belongs to the preamble associated with the PRACH retransmission count m among the M preambles associated with the SSB index selected by the UE.

[0030] In some embodiments, the second parameter includes a bit sequence corresponding to the number of times each candidate PRACH is repeated, the sequence length of the bit sequence being equal to the maximum number of times the candidate PRACH is repeated in the set of candidate PRACH repeated transmissions, each bit in the bit sequence corresponding to a PRACH transmission opportunity, and the value of each bit in the bit sequence indicating whether to use the corresponding PRACH transmission opportunity for repeated transmission.

[0031] In some embodiments, when the value is 1, it indicates that the corresponding PRACH transmission timing is used for repeated transmission; when the value is 0, it indicates that the corresponding PRACH transmission timing is not used for repeated transmission. In some embodiments,

[0032] In some embodiments, the configuration information further includes a fourth parameter, which indicates the association between each SSB index and multiple PRACH transmission opportunities. The first group of PRACH transmission opportunities includes a second group of PRACH transmission opportunities corresponding to each PRACH repetition number among the at least some candidate PRACH repetition transmission numbers in the multiple PRACH transmission opportunities associated with each SSB index. The repetition of the first preamble m times on the first group of PRACH transmission opportunities corresponding to the PRACH repetition number m includes: repetition of the first preamble m times on the second group of PRACH transmission opportunities corresponding to the PRACH repetition number m in the multiple PRACH transmission opportunities associated with an SSB index selected by the UE.

[0033] In some embodiments, the timing of multiple PRACH transmissions associated with each SSB index does not overlap in the time domain.

[0034] In some embodiments, the multiple PRACH transmission opportunities associated with each SSB index are arranged consecutively in the time domain.

[0035] In some embodiments, the maximum number of candidate PRACH repeat transmissions in the candidate PRACH repeat transmission count set does not exceed the number of multiple PRACH transmission opportunities associated with each SSB index.

[0036] In some embodiments, the method further includes: receiving a second DCI; determining a RA-RNTI based on a PRACH transmission timing in the first group of PRACH transmission timings corresponding to the number of PRACH repetitions m; descrambling the second DCI using the RA-RNTI to obtain a first DCI; and receiving a RAR based on the first DCI.

[0037] In some embodiments, the configuration information further includes a fourth parameter, which is used to indicate the association between each SSB index and multiple PRACH transmission opportunities. The first group of PRACH transmission opportunities includes a second group of PRACH transmission opportunities corresponding to the number of PRACH repetitions in the PRACH transmission opportunities associated with each SSB index. The PRACH transmission opportunity belongs to the second group of PRACH transmission opportunities corresponding to the number of PRACH repetitions m in the multiple PRACH transmission opportunities associated with the SSB index selected by the UE.

[0038] In some embodiments, there exists an i such that the i-th PRACH transmission timing is different in each second group of PRACH transmission timings, and the i-th PRACH transmission timing is the i-th PRACH transmission timing.

[0039] In some embodiments, the method further includes: performing a subsequent random access procedure if the RAR carries the RAPID of the first preamble.

[0040] According to another aspect of the present disclosure, a PRACH retransmission apparatus is provided, applied on the 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 used only for single PRACH transmission and the second PRACH transmission resource is used only for retransmission of PRACH.

[0041] According to another aspect of the present disclosure, a PRACH repeat transmission apparatus is provided, applied on a network side, comprising: a memory; and a processor coupled to the memory, configured to execute the method described in any of the above embodiments based on instructions stored in the memory.

[0042] According to another aspect of the present disclosure, a PRACH retransmission apparatus is provided, applied to a UE, comprising: a receiving module configured to receive configuration information, the configuration information indicating a first PRACH transmission resource for single PRACH transmission only and a second PRACH transmission resource for retransmission only; and a transmission module configured to transmit a preamble according to the configuration information.

[0043] According to another aspect of the present disclosure, a PRACH repeat transmission apparatus is provided, applied to a UE, comprising: a memory; and a processor coupled to the memory, configured to execute the method described in any of the above embodiments based on instructions stored in the memory.

[0044] According to another aspect of the present disclosure, a base station is provided, including the apparatus described in any of the above embodiments applied to the network side.

[0045] According to another aspect of the present disclosure, a user equipment is provided, including the apparatus described in any of the embodiments applied to a UE.

[0046] According to another aspect of the present disclosure, a PRACH repeat transmission system is provided, comprising: a base station and a user equipment as described in any of the above embodiments.

[0047] According to another aspect of the present disclosure, a computer-readable storage medium is provided, including computer program instructions, wherein the computer program instructions, when executed by a processor, implement the method described in any of the above embodiments.

[0048] According to another aspect of the present disclosure, a computer program product is provided, including a computer program, wherein the computer program, when executed by a processor, implements the method described in any of the above embodiments.

[0049] In this embodiment of the disclosure, by configuring a first PRACH transmission resource that is only used for single PRACH transmission and a second PRACH transmission resource that is only used for repeated PRACH transmission, the probability of conflict between single PRACH transmission and repeated PRACH transmission is reduced while ensuring single PRACH transmission and realizing repeated PRACH transmission.

[0050] The technical solution of this disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic flowchart of a PRACH repeat transmission method according to some embodiments of the present disclosure;

[0053] Figure 2 This is a schematic diagram illustrating the relationship between the SSB index and the PRACH transmission timing according to some embodiments of this disclosure;

[0054] Figure 3 This is a schematic diagram illustrating the relationship between the SSB index and the PRACH transmission timing according to some embodiments of this disclosure;

[0055] Figure 4 This is a schematic diagram illustrating the relationship between the SSB index and the PRACH transmission timing according to some embodiments of this disclosure;

[0056] Figure 5 This is a schematic diagram of the process of performing PRACH detection on the network side according to some embodiments of this disclosure;

[0057] Figure 6 This is a flowchart illustrating a PRACH retransmission method according to some embodiments of the present disclosure;

[0058] Figure 7 This is a schematic diagram of the structure of a PRACH repeat transmission apparatus according to some embodiments of the present disclosure;

[0059] Figure 8 This is a schematic diagram of the structure of a PRACH repeat transmission apparatus according to some embodiments of the present disclosure;

[0060] Figure 9 This is a schematic diagram of the structure of a PRACH transmission device according to some embodiments of the present disclosure;

[0061] Figure 10 This is a schematic diagram of the structure of a PRACH repeat transmission system according to some embodiments of the present disclosure. Detailed Implementation

[0062] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0064] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0065] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0066] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0067] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0068] Figure 1 This is a schematic flowchart of a PRACH repeat transmission method according to some embodiments of the present disclosure. This PRACH repeat transmission method is applied on the network side.

[0069] In step 102, the network side configures a first PRACH transmission resource and a second PRACH transmission resource. The first PRACH transmission resource is used only for single PRACH transmission, and the second PRACH transmission resource is used only for repeated PRACH transmission.

[0070] It is understood that since the first PRACH transmission resource is used only for a single PRACH transmission and the second PRACH transmission resource is used only for repeated PRACH transmissions, there is no resource overlap between the first and second PRACH transmission resources. In other words, the first PRACH transmission timing included in the first PRACH transmission resource and the second PRACH transmission timing included in the second PRACH transmission resource do not overlap in at least one of the time and frequency domains. In some embodiments, the non-overlapping of the first and second PRACH transmission timings in the time domain is beneficial to increasing the probability of successful PRACH transmission, thereby improving PRACH coverage performance.

[0071] By employing the methods described above, the network side reduces the probability of resource conflicts arising from single PRACH transmissions and repeated PRACH transmissions, while ensuring both single PRACH transmissions and repeated PRACH transmissions.

[0072] The following describes how to configure the second PRACH transmission resource on the network side using different embodiments.

[0073] In some embodiments, configuring the second PRACH transmission resource on the network side includes configuring a set of candidate PRACH retransmission counts supported by the network side. The set of candidate PRACH retransmission counts includes at least one candidate PRACH retransmission count, for example, it may include only one candidate PRACH retransmission count or include multiple candidate PRACH retransmission counts.

[0074] For example, the network side configures the candidate PRACH retransmission count set as {2, 4, 8}. The UE selects one PRACH retransmission count from the candidate PRACH retransmission count set configured by the network side for PRACH retransmission. Configuring the candidate PRACH retransmission count set by the network side allows the UE to more flexibly select the number of times to retransmit the preamble according to its needs, reducing resource waste.

[0075] In some embodiments, configuring the second PRACH transmission resources 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 the number of retransmissions of each candidate PRACH and the preamble, and the second parameter is used to indicate the first group of PRACH transmission timings corresponding to the number of retransmissions of each candidate PRACH among at least a portion of the candidate PRACH retransmissions.

[0076] With the first parameter configured on the network side, the UE selects a preamble from the preambles associated with the number of PRACH retransmissions chosen by the UE and retransmits it. Subsequently, the network side can determine the number of PRACH retransmissions selected by the UE based on the received preamble, and distinguish between UEs performing single PRACH transmissions and UEs performing repeated PRACH transmissions, which helps reduce the probability of resource conflicts between UEs performing single PRACH transmissions and UEs performing repeated PRACH transmissions.

[0077] In some embodiments, different preambles are associated with different candidate PRACH retransmission counts. In other words, when two UEs determine different PRACH retransmission counts, they will transmit different preambles during PRACH retransmission. When performing PRACH detection, the network can determine the PRACH retransmission count selected by the UE based on the received preamble, thereby distinguishing UEs that have selected different PRACH retransmission counts. This method can prevent UEs that have selected different candidate PRACH retransmission counts from transmitting the same preamble, thus avoiding resource conflicts between UEs that have selected different PRACH retransmission counts.

[0078] With a second parameter configured on the network side, the UE determines the first set of PRACH retransmission timings associated with the number of PRACH retransmissions selected by the UE based on the second parameter. Subsequently, when performing PRACH detection, the network side performs PRACH detection group by group for each of these first set of PRACH retransmission timings, avoiding missing any PRACH transmission opportunities and increasing the probability of detecting the preamble transmitted by the UE. Furthermore, the network side can determine whether the UE is performing PRACH retransmission based on the PRACH transmission timing of the received preamble, and distinguish between UEs performing single PRACH transmissions and UEs performing PRACH retransmissions, which helps reduce the probability of resource conflicts between UEs performing PRACH retransmissions and UEs performing single PRACH transmissions.

[0079] In some embodiments, configuring the second PRACH transport resource on the network side further includes configuring a third parameter, which is used to indicate the association between each SSB index and the preamble.

[0080] 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 subsequent random access procedures in the direction of this beam can facilitate the UE's reception and increase the probability of the UE receiving the information.

[0081] In some embodiments, the first parameter is configured based on the third parameter. Specifically, each SSB index is associated with M preambles, and the set of candidate PRACH retransmission counts contains Q candidate PRACH retransmission counts. M mod Q = K. The number of repeated transmissions of K candidate PRACHs in the candidate PRACH repeated transmission count set is associated with P+1 preambles, and the number of repeated transmissions of other candidate PRACHs in the candidate PRACH repeated transmission count set is associated with P preambles, where M and Q are both greater than or equal to 1.

[0082] Understandably, in the above method, the network side allocates P preambles to each candidate PRACH retransmission number on an average basis. When the remaining K preambles are insufficient to support an average allocation, K candidate PRACH retransmission numbers are selected from the candidate PRACH retransmission numbers, and one more preamble is allocated to each of the selected K candidate PRACH retransmission numbers.

[0083] Using the above method, when the network performs PRACH detection, it determines two pieces of information based on the received preamble: the SSB index selected by the UE and the number of PRACH retransmissions selected by the UE. For UEs that select different SSB indices, the network transmits the information required for subsequent random access procedures in the beam direction corresponding to the SSB index selected by the UE, thereby avoiding resource conflicts between UEs that select different SSB indices. Even if different UEs select the same SSB index, if they select different numbers of PRACH retransmissions, the network can still distinguish between UEs that select different numbers of PRACH retransmissions based on the received preamble, thus avoiding resource conflicts between UEs that select different numbers of PRACH retransmissions.

[0084] For example, The set of candidate PRACH retransmission counts is {2, 4, 8}. In this case, , At this point, the network side associates candidate PRACH retransmission number 2 with 6 preambles, and candidate PRACH retransmission numbers 4 and 8 with 5 preambles respectively.

[0085] For example, The set of candidate PRACH retransmission counts is {2, 4}. In this case, , At this point, the network side associates 8 preambles with each candidate PRACH repetition number.

[0086] In some embodiments, the second parameter includes a bit sequence corresponding to the number of times each candidate PRACH is repeated. The length of the bit sequence is equal to the maximum number of times the candidate PRACH is repeated in the set of candidate PRACH repeated transmissions. 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.

[0087] For example, the set of candidate PRACH repetition counts is {2, 4}. In this case, the second parameter includes two bit sequences corresponding to the candidate PRACH repetition counts of 2 and 4, respectively.

[0088] When configuring the second parameter in the form of a bit sequence, the bit sequence length corresponding to each candidate PRACH repetition number is the same. For each bit in the bit sequence, the PRACH transmission timing corresponding to that bit is configured by changing the bit value. This method facilitates the network side in configuring the PRACH transmission timing corresponding to different candidate PRACH repetition numbers, simplifying the configuration method and improving configuration efficiency. In some implementations, when a bit in the bit sequence is 1, it indicates that the corresponding PRACH transmission timing is used for repetition; when the value is 0, it indicates that the corresponding PRACH transmission timing is not used for repetition. For example, the bit sequence "1001" indicates that when the PRACH repetition number is 2, the UE uses the PRACH transmission timing corresponding to the first and fourth bits of the bit sequence to repetition the preamble.

[0089] In some embodiments, configuring the second PRACH transmission resources further includes configuring a fourth parameter, which indicates the association between each SSB index and multiple PRACH transmission opportunities. Here, the first set of PRACH transmission opportunities includes the second set of PRACH transmission opportunities corresponding to the number of times each candidate PRACH is repeated in the PRACH transmission opportunities associated with each SSB index. For example, the set of candidate PRACH repeated transmission times is configured as {2}, and the first set of PRACH transmission opportunities associated with candidate PRACH repeated transmission time 2 includes PRACH transmission opportunities #1, #2, #3, and #4; and the network side is configured with two SSB indices, namely SSB#0 and SSB#1. The first set of PRACH transmission opportunities includes the second set of PRACH transmission opportunities #1 and #2 associated with SSB index SSB#0 and the second set of PRACH transmission opportunities #3 and #4 associated with SSB#1.

[0090] When performing PRACH detection, the network side determines the SSB index selected by the UE by associating the SSB index with multiple PRACH transmission opportunities. This determines the beam with the best transmission quality selected by the UE, and the information required for subsequent random access procedures is transmitted in the direction of that beam so that the UE can receive it.

[0091] In some embodiments, the maximum number of candidate PRACH repeat transmissions in the candidate PRACH repeat transmission count set does not exceed the number of PRACH transmission opportunities associated with each SSB index.

[0092] In some implementations, the fourth parameter includes a preset value N, when When, it indicates that one PRACH transmission opportunity is associated with N SSB indices; when When N is a second PRACH transmission, it indicates that one SSB is associated with one / 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}.

[0093] In some embodiments, the third and fourth parameters are related. Since the total number of preambles usable in each cell is limited to 64, and is constrained by the total number of preambles, when… hour, ;when When, satisfy In some embodiments, the network side configures one or more of the first, second, third, and fourth parameters mentioned above.

[0094] The following describes how to configure the fourth parameter on the network side using different embodiments.

[0095] In some embodiments, within a period associated with the SSB index and the PRACH transmission timing, the total number of PRACH transmission timings is: The total number of SSB indexes is The number of PRACH transmission opportunities associated with the same SSB index is ,but .

[0096] The following is combined with Figure 2 , Figure 3 and Figure 4 This paper introduces the implementation method of configuring the SSB index on the network side and the association between multiple PRACH transmission timings.

[0097] Figure 2 This is a schematic diagram illustrating the relationship between the SSB index and the PRACH transmission timing according to some embodiments of this disclosure.

[0098] like Figure 2 As shown, the total number of SSB indices within a correlation period of SSB and PRACH transmission timing. =16, representing SSB#0~SSB#15 respectively; the total number of PRACH transmission opportunities is... =16, representing PRACH transmission times #0~#15. N=4, =4.

[0099] The N SSB indices are grouped in ascending order of their index numbers, resulting in 4 groups for the 16 SSBs. Each group of SSB indices is associated with 4 PRACH transmission times. For example, SSB#0~SSB#3 are associated with PRACH transmission times #0~#3; SSB#4~SSB#7 are associated with PRACH transmission times #4~#7; SSB#8~SSB#11 are associated with PRACH transmission times #8~#11; and SSB#12~SSB#15 are associated with PRACH transmission times #12~#15.

[0100] In some implementations, the network side configures both the second and fourth parameters.

[0101] For example, the network side configures the set of candidate PRACH retransmission counts as {2, 4}. The network side configures the second parameter "1001" for candidate PRACH retransmission count 2 and the second parameter "1111" for candidate PRACH retransmission count 4. Furthermore, the association between the SSB index and the timing of multiple PRACH transmissions is configured as follows: Figure 2 As shown.

[0102] When the UE selects SSB#0 and determines the PRACH retransmission count to be 2, according to the second parameter "1001" and such... Figure 2 The relationship is shown below. During PRACH transmission times #0 to #3, the UE selects the first bit of the bit sequence corresponding to PRACH transmission time #0 and the fourth bit corresponding to PRACH transmission time #3 to repeatedly transmit the preamble. In subsequent PRACH detection, the network side detects the preamble on PRACH transmission times #0 and #3 according to the second parameter.

[0103] When the UE selects SSB#0 and determines that the number of PRACH retransmissions is 4, the UE retransmits the preamble during PRACH transmission times #0 to #3, and the network side performs PRACH detection during PRACH transmission times #0 to #3.

[0104] For example, the network side configures the set of candidate PRACH retransmission counts as {2, 4}. The network side configures the second parameter "1010" for candidate PRACH retransmission count 2 and the second parameter "1111" for candidate PRACH retransmission count 4. Furthermore, the association between the SSB index and the timing of multiple PRACH transmissions is configured as follows: Figure 2 As shown.

[0105] When the UE selects SSB#8 and determines the PRACH retransmission count to be 2, according to the second parameter "1010" and such... Figure 2 The relationship is shown below. During PRACH transmission times #8 to #11, the UE selects the first bit of the bit sequence corresponding to PRACH transmission time #8 and the third bit corresponding to PRACH transmission time #10 to repeatedly transmit the preamble. In subsequent PRACH detection, the network side detects the preamble on PRACH transmission times #8 and #10 according to the second parameter.

[0106] Figure 3 This is a schematic diagram illustrating the relationship between the SSB index and the PRACH transmission timing according to some embodiments of this disclosure.

[0107] Figure 4 This is a schematic diagram illustrating the relationship between the SSB index and the PRACH transmission timing according to some embodiments of this disclosure.

[0108] according to Figure 3 or Figure 4 As shown, the total number of SSB indices within a correlation period of SSB and PRACH transmission timing. =16, representing SSB#0~SSB#15 respectively; the total number of PRACH transmission opportunities is... =18, representing PRACH transmission times #0 to #18. N=4, =4.

[0109] The N SSB indices are divided into groups in ascending order of their index numbers, and the 16 SSBs can be divided into 4 groups. Each group of SSB indices is associated with 4 PRACH transmission opportunities, leaving 2 PRACH transmission opportunities remaining.

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

[0111] In other implementations, such as Figure 4 As shown, SSB#0~SSB#3 are associated with PRACH transmission times #0~#3; SSB#4~SSB#7 are associated with PRACH transmission times #4~#7; SSB#8~SSB#11 are associated with PRACH transmission times #9~#12; SSB#12~SSB#15 are associated with PRACH transmission times #13~#16; and PRACH transmission times #8 and #17 remain.

[0112] In some embodiments, the remaining PRACH transmission opportunities are not used for PRACH retransmission.

[0113] In some embodiments, the second parameter indicates at least a portion of the candidate PRACH retransmission counts, including the number of retransmissions for each PRACH except for the maximum candidate PRACH retransmission count. In other words, the second parameter may only indicate a portion of the candidate PRACH retransmission counts, excluding the maximum candidate PRACH retransmission count. For the maximum candidate PRACH retransmission count, 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 retransmission counts is {2, 4}, the network side does not configure the second parameter for candidate PRACH retransmission count 4. If the UE selects to retransmit the preamble 4 times, the preamble is retransmitted by default on each PRACH transmission opportunity associated with the SSB index selected by the UE. Not configuring the second parameter for the maximum candidate PRACH retransmission count on the network side can save configuration resources and time, improving configuration efficiency.

[0114] Figure 5 This is a schematic diagram of the process of performing PRACH detection on the network side according to some embodiments of this disclosure.

[0115] In some embodiments, the network side also performs Figure 5 The following steps 502 to 508 are shown.

[0116] In step 502, detection is performed at least a portion of the PRACH transmission timing in the second PRACH transmission resources to obtain the first preamble that the UE repeatedly transmits.

[0117] In step 504, RA-RNTI is determined based on one of the PRACH transmission opportunities from at least a portion of the PRACH transmission opportunities.

[0118] In step 506, the first DCI is scrambled using RA-RNTI to obtain the second DCI.

[0119] In step 508, a second DCI and a RAR scheduled by the second DCI are sent, the RAR carrying the RAPID of the first preamble.

[0120] In this way, the network side can ensure that the UE transmitting PRACH once cannot descramble the DCI corresponding to the UE transmitting the first preamble, thereby reducing the possibility of resource conflicts between UE transmitting PRACH once and UE transmitting PRACH repeatedly.

[0121] In some embodiments, the network side and the UE agree to select a set of PRACH transmission opportunities from multiple PRACH transmission opportunities associated with the SSB index selected by the UE, in either ascending or descending order. For example, the multiple PRACH transmission opportunities associated with the SSB index are as follows: Figure 2 The network and UE agree to select a portion of the PRACH transmission opportunities in reverse order for PRACH retransmission. The UE selects SSB#0 and determines the PRACH retransmission count to be 2. Therefore, according to the agreement, the UE retransmits the preamble on PRACH transmission opportunities #3 and #2. The network also detects the preamble 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.

[0122] In other embodiments, when a second parameter is configured on the network side (for indicating the first group of PRACH transmission opportunities corresponding to each candidate PRACH repetition number in at least a portion of the candidate PRACH repetition numbers), the at least a portion 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 one of the PRACH transmission opportunities in the first group of PRACH transmission opportunities. Different PRACH transmission numbers selected by the UE result in different determined RA-RNTIs. This implementation avoids UEs selecting different PRACH repetition numbers from determining the same RA-RNTI, thereby avoiding resource conflicts between UEs selecting different PRACH repetition numbers and reducing the probability of resource conflicts between different UEs.

[0123] In some other embodiments, when the network side configures a second and a fourth parameter (for indicating the association between each SSB index and multiple PRACH transmission opportunities), the first set of PRACH transmission opportunities includes the corresponding second set of PRACH transmission opportunities in the PRACH transmission opportunities associated with each SSB index, and at least some of the PRACH transmission opportunities detected by the network side include the second set of PRACH transmission opportunities. The network side determines the RA-RNTI based on one of the PRACH transmission opportunities in the second set of PRACH transmission opportunities.

[0124] Under the above method, even if the UE selects the same SSB index, the RA-RNTI will be different if the number of PRACH retransmissions selected by the UE is different. Alternatively, even if the UE determines the same number of PRACH transmissions, different SSB indices will result in different RA-RNTIs. This implementation avoids UEs selecting the same SSB index or the same number of PRACH retransmissions determining the same RA-RNTI, thereby further reducing the probability of resource conflicts between different UEs.

[0125] In some embodiments, to facilitate the network side and the UE in determining the same RA-RNTI value, the PRACH transmission timing of the UE's last preamble transmission is determined as the basis for calculating RA-RNTI. The inventors noted that among multiple PRACH transmission timings associated with the same SSB index, the first set of PRACH transmission timings associated with each candidate PRACH repetition count may reuse the same PRACH transmission timing. If the basis for calculating RA-RNTI is determined as the reused PRACH transmission timing, it may lead to UEs selecting different PRACH repetition counts determining the same RA-RNTI, increasing the probability of resource conflicts between UEs selecting different PRACH repetition counts.

[0126] To address the above problems, this disclosure proposes the following solutions.

[0127] In some embodiments, there exists an i such that the i-th PRACH transmission timing in the first group of PRACH transmission timings corresponding to the number of repeated transmissions of each candidate PRACH is different from the i-th PRACH transmission timing in the second group of PRACH transmission timings. In this case, the PRACH transmission timing used as the basis for determining 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 RA-RNTI. For UEs that select different second group of PRACH transmission timings, even if the same preamble is sent, the RA-RNTI value will be different because the i-th PRACH transmission timing used to determine RA-RNTI is different. The above implementation can reduce the probability that UEs that select multiple PRACH transmission timings associated with the same SSB index will determine the same RA-RNTI, thereby reducing the probability of resource conflicts between different UEs.

[0128] For example, the relationship between the SSB index and multiple PRACH retransmission timings is as follows: Figure 2 As shown, the network side configures the set of candidate PRACH retransmission counts as {2, 3, 4}. The network side configures the second parameter "1001" for candidate PRACH retransmission count 2; the second parameter "1011" for candidate PRACH retransmission count 3; and the second parameter "1111" for candidate PRACH retransmission count 4.

[0129] In the PRACH transmission opportunities #0~#3 associated with SSB#0 selected by the UE, the candidate PRACH retransmission count 2 corresponds to the first second group of PRACH transmission opportunities #0, #3, the candidate PRACH retransmission count 3 corresponds to the second second group of PRACH transmission opportunities #0, #2, #3, and the candidate PRACH retransmission count 4 corresponds to the third second group of PRACH transmission opportunities #0, #1, #2, #3.

[0130] For each of the above-mentioned second PRACH retransmission timings, the timing of the second PRACH transmission is different. The second PRACH transmission timing for the first second PRACH transmission timing is #3; the second PRACH transmission timing for the second second PRACH transmission timing is #2; and the second PRACH transmission timing for the third second PRACH transmission timing is #1. The UE and the network agree to use the second PRACH transmission timing as the basis for determining the RA-RNTI.

[0131] In some embodiments, the multiple PRACH transmission times associated with each SSB index do not overlap in the time domain. When PRACH transmissions are performed in different frequency domains within the same time domain, frequency division reduces the transmission power in each frequency domain, which is detrimental to the network side's detection of the preamble. However, repeatedly transmitting the preamble in the time domain does not reduce the transmission power and can increase the probability of the preamble being detected. Therefore, configuring the multiple PRACH transmission times associated with the same SSB index to not overlap in the time domain on the network side is beneficial to increasing the probability of successful PRACH transmission, thereby improving PRACH coverage performance.

[0132] In some embodiments, the network side configures multiple PRACH transmission times associated with the same SSB index to be non-overlapping and consecutively arranged in the time domain, which facilitates PRACH detection on the network side. For example, as Figure 2 As shown, the PRACH transmission times #4, #5, #6 and #7 associated with SSB#5 do not overlap in the time domain and are arranged consecutively in the time domain.

[0133] In some embodiments, the network side also sends configuration information indicating a first PRACH transport resource used only for a single PRACH transmission and a second PRACH transport resource used only for repeated PRACH transmissions.

[0134] The network side notifies the UE of the configuration of the first and second PRACH transmission resources by sending configuration information, so that the UE can select any one of the PRACH transmission resources to carry out PRACH transmission according to the configuration information.

[0135] In some embodiments, any of the network-side configurations of the second PRACH transmission resources mentioned above can be carried in the configuration information.

[0136] 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 in 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, specifically indicating the following information: preamble format, system frame number, subframe number, starting Orthogonal Frequency Division Multiplexing (OFDM) symbol position, number of time slots used for PRACH transmission within a subframe, number of PRACH time-domain transmission opportunities within a PRACH time slot, and number of PRACH duration symbols.

[0137] For example, a system frame is 10ms long, each system frame includes 10 subframes, each subframe is 1ms long, each subframe includes one or more time slots, and each time slot consists of multiple consecutive OFDM symbols.

[0138] The above information can be used to determine the format of the preamble used for a single transmission, the time-domain location of the PRACH transmission timing for a single transmission, and the number of PRACH transmission timings in the time domain.

[0139] In some embodiments, the number of PRACH transmission opportunities in the frequency domain for the first PRACH transmission resource can be indicated by the parameter msg1-FDM, which can 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.

[0140] The total number of PRACH transmission opportunities for the first PRACH transmission resource can be determined based on the number of PRACH transmission opportunities in the time domain and the number of transmission opportunities in the frequency domain.

[0141] In some embodiments, the network side indicates the number of PRACH transmission opportunities associated with an SSB index and the number of preambles corresponding to each SSB index by configuring the parameter ssb-perRACH-Occasion AndCB-PreamblesPerSSB. These parameters are used to indicate the number of preambles used in a contention-based random access procedure.

[0142] 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 is oneHalf (1 / 2), it means that one SSB index is associated with two PRACH transmission opportunities; when the parameter ssb-perRACH-Occasion is two (2), it means that two SSB indices are associated with one PRACH transmission opportunity.

[0143] 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 parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB 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.

[0144] As described above, each SSB index is associated with at least one PRACH transmission timing. The base station can indirectly obtain the information of the SSB index selected by the UE by detecting the PRACH transmission timing adopted by the UE.

[0145] In some embodiments, when N SSB indices are configured on the network side, each of the N SSB indices is associated with a corresponding PRACH transmission opportunity according to certain rules. One round of association is considered complete after each of the N SSBs has been associated with a PRACH transmission opportunity. If there are remaining PRACH transmission opportunities, the N SSB indices 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 is not used for PRACH transmission.

[0146] In some embodiments, RA-RNTI is calculated based on the following parameters: the first OFDM symbol index of the second PRACH transmission timing, the first time slot index of the second PRACH transmission timing within a system frame, the frequency domain index of the second PRACH transmission timing, and the uplink carrier ID for random access (this value is 0 for a normal uplink carrier and 1 for a supplementary uplink carrier). The first three of the above parameters are determined by the time-frequency position of the second PRACH transmission timing.

[0147] Figure 6 This is a schematic flowchart of a PRACH repeat transmission method according to some embodiments of the present disclosure.

[0148] In step 602, the UE receives configuration information indicating a first PRACH transport resource used only for a single PRACH transmission and a second PRACH transport resource used only for repeated PRACH transmissions.

[0149] In step 604, the UE transmits a preamble based on the configuration information.

[0150] For example, when the UE performs a single PRACH transmission, the preamble is transmitted during the first PRACH transmission time in the first PRACH transmission resource that is only used for a single PRACH transmission.

[0151] For example, when the UE performs a PRACH retransmission, the preamble is transmitted during the second PRACH transmission time in the second PRACH transmission resource that is only used for PRACH retransmission.

[0152] The UE can perform single PRACH transmission or repeated PRACH transmission according to the configuration information. Furthermore, by using different PRACH transmission resources when performing single PRACH transmission and repeated PRACH transmission, the probability of resource conflicts between single PRACH transmission and repeated PRACH transmission can be reduced.

[0153] The implementation of step 604 is described below with reference to different embodiments.

[0154] In some embodiments, the configuration information also includes a set of candidate PRACH retransmission counts supported by the network side. In this case, transmitting the preamble according to the configuration information in step 604 includes: determining a PRACH retransmission count m from the candidate PRACH retransmission count set; and retransmitting the first preamble m times using the second PRACH transmission resource. The UE can select a PRACH retransmission count from the candidate PRACH retransmission count set as needed, which helps reduce resource waste.

[0155] In some embodiments, the configuration information further includes at least one of a first parameter and a second parameter, wherein the first parameter is used to indicate the association between the number of repeated transmissions of each candidate PRACH and the preamble; and the second parameter is used to indicate the first group of PRACH transmission timings corresponding to the number of repeated transmissions of each candidate PRACH among at least a portion of the candidate PRACH repeated transmissions.

[0156] When the configuration information includes a first parameter, the UE transmits a preamble associated with the number of PRACH retransmissions selected by the UE according to the indication of the first parameter, which helps to reduce the probability of resource conflicts between UEs performing PRACH retransmissions and UEs performing single PRACH transmissions.

[0157] If the configuration information includes the second parameter, the timing of the first PRACH transmission corresponding to the number of PRACH retransmissions m is determined according to the second parameter; the first preamble is retransmitted m times at the timing of the first PRACH transmission corresponding to the number of PRACH retransmissions m.

[0158] With the second parameter configured on the network side, the UE performs PRACH retransmission at the first PRACH retransmission timing associated with the number of PRACH retransmissions m, which helps reduce the probability of resource conflicts between UEs performing PRACH retransmissions and UEs performing single PRACH transmissions.

[0159] In some embodiments, different preambles are associated with different candidate PRACH retransmission counts. UEs that select different candidate PRACH retransmission counts to transmit preambles can avoid resource conflicts caused by UEs that select different PRACH retransmission counts.

[0160] In some embodiments, the configuration information further includes a third parameter, which indicates the association between each SSB index and a preamble, wherein the first preamble belongs to a preamble associated with an SSB index selected by the UE.

[0161] 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 retransmissions m among the M preambles associated with the SSB index selected by the UE.

[0162] For example, M=16, the set of candidate PRACH repetition counts is {2, 4, 8}, and Q=3. In this case, M mod Q=1, candidate PRACH repetition number 2 is associated with 6 preambles, and candidate PRACH repetition numbers 4 and 8 are associated with 5 preambles each. If the UE selects a PRACH repetition number m=2, then the first preamble sent by the UE is one of the 6 preambles associated with candidate PRACH repetition number 2.

[0163] In this way, the preamble sent by the UE belongs to the preamble associated with the PRACH repetition number m selected by the UE. When the network receives the first preamble, it can determine not only the PRACH repetition number m, but also the SSB index selected by the UE. This facilitates the network side in distinguishing UEs that select different SSB indices or different PRACH repetition numbers.

[0164] In some embodiments, the configuration information further includes a fourth parameter. In this case, the UE repeatedly transmits the first preamble m times on the second set of PRACH transmission opportunities corresponding to the number of PRACH retransmissions m times, among the multiple PRACH transmission opportunities associated with the selected SSB index. The UE repeatedly transmits the preamble specified by the network side on the PRACH retransmission opportunity specified by the network side. In the above case, the network side can determine the number of PRACH retransmissions selected by the UE based on either the received preamble or the second set of PRACH transmission opportunities in which the preamble is received, and verify whether the determined number of PRACH retransmissions is correct based on the other information.

[0165] In some embodiments, after sending the preamble, the UE further performs the following steps: receiving the second DCI; determining the RA-RNTI based on one of the PRACH transmission opportunities in the first group of PRACH transmission opportunities corresponding to the number of PRACH repetitions m; descrambling the second DCI using the RA-RNTI to obtain the first DCI; and receiving the RAR based on the first DCI.

[0166] After sending the preamble, the UE listens for the PDCCH within the RAR time window. This PDCCH carries the second DCI sent by the network side. The UE listens for the PDCCH to receive the second DCI, which is obtained by scrambling the first DCI using RA-RNTI by the network side. For the UE to successfully receive the RAR sent by the network side for that UE, the RA-RNTI value determined by the UE must be the same as that of the network side. Therefore, when the UE selects a set of PRACH transmission opportunities, it selects one from the first set of PRACH transmission opportunities corresponding to the number of PRACH repetitions *m*, according to a pre-agreed agreement with the network side, to determine the RA-RNTI.

[0167] In some embodiments, the configuration information further includes a fourth parameter. In this case, the PRACH transmission timing used to determine whether a PRACH transmission timing of RA-RNTI belongs to the second group of PRACH transmission timings corresponding to the number of PRACH repetitions m in the first group of PRACH transmission timings associated with the SSB index selected by the UE.

[0168] In some embodiments, when a fourth parameter is configured on the network side, there exists an 'i' such that the i-th PRACH transmission timing in each second group of PRACH transmission timings is different, and one PRACH transmission timing is the i-th PRACH transmission timing. That is, one PRACH transmission timing used to determine the RA-RNTI value is the i-th PRACH transmission timing. The above implementation can reduce the probability that UEs selecting 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.

[0169] In some embodiments, the UE performs subsequent random access procedures when the RAR carries the RAPID of the first preamble. In some embodiments, the RAR includes information required by the UE to perform subsequent random access procedures.

[0170] For other embodiments of the PRACH retransmission method applied to the UE described above, please refer to the embodiments of the PRACH retransmission method applied to the network side described above, which will not be repeated here.

[0171] Figure 7 This is a schematic diagram of a PRACH repeat transmission apparatus according to some embodiments of the present disclosure, which is applied on the network side.

[0172] like Figure 7 As shown, the PRACH repeat transmission device includes a configuration module 701.

[0173] The configuration module 701 is configured to configure a first PRACH transmission resource and a second PRACH transmission resource, wherein the first PRACH transmission resource is used only for single PRACH transmission and the second PRACH transmission resource is used only for repeated PRACH transmission.

[0174] It should be understood that the above-described PRACH repeat transmission apparatus may also include other modules to perform the PRACH repeat transmission method applied to the network side in any of the above embodiments.

[0175] Figure 8 This is a schematic diagram of a PRACH repeat transmission apparatus according to some embodiments of the present disclosure, which is applied to a UE.

[0176] like Figure 8 As shown, the PRACH transmission device includes a receiving module 801 and a transmission module 803.

[0177] The receiving module 801 is configured to receive 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.

[0178] The transmission module 803 is configured to transmit a preamble according to the configuration information.

[0179] It should be understood that the above-described PRACH repeat transmission apparatus may also include other modules to perform the PRACH repeat transmission method applied to the UE in any of the above embodiments.

[0180] For other embodiments of the above-described PRACH repeat transmission device, please refer to the embodiments of the PRACH repeat transmission method described above, which will not be repeated here.

[0181] Figure 9 This is a schematic diagram of the structure of a PRACH transmission device according to some embodiments of the present disclosure.

[0182] like Figure 9 As shown, the PRACH transmission device 900 includes a memory 901 and a processor 902 coupled to the memory 901. The processor 902 is configured to execute any of the aforementioned methods applied to the network side or UE based on instructions stored in the memory 901.

[0183] The memory 901 may include, for example, system memory, fixed non-volatile storage media, etc. The system memory may store, for example, an operating system, application programs, a boot loader, and other programs.

[0184] The PRACH repeat transfer device 900 may also include an input / output interface 903, a network interface 904, a storage interface 905, etc. These interfaces 903, 904, and 905, as well as the memory 901 and the processor 902, can be connected, for example, via a bus 906. The input / output interface 603 provides a connection interface for input / output devices such as displays, mice, keyboards, and touch screens.

[0185] In some embodiments, this disclosure also provides a base station that includes the PRACH retransmission device of any of the above embodiments, for example... Figure 7 or Figure 9 The PRACH repeat transmission device shown.

[0186] In some embodiments, this disclosure also proposes a UE that includes the PRACH retransmission means of any of the above embodiments, for example... Figure 8 or Figure 9 The PRACH repeat transmission device shown.

[0187] Figure 10 This is a schematic diagram of a PRACH repeat transmission system according to some embodiments of the present disclosure. The PRACH repeat transmission system includes a base station 1001 and a UE 1002.

[0188] This disclosure also provides a computer-readable storage medium including computer program instructions that, when executed by a processor, implement the method of any of the above embodiments.

[0189] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the method of any of the above embodiments.

[0190] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus embodiments, since they largely correspond to the method embodiments, the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0191] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0192] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0193] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that the functions specified in one or more flowchart illustrations and / or one or more block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate functions for implementing the functions in the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0194] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0195] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0196] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A method for repeated transmission of a Physical Random Access Channel (PRACH), applied on the network side, comprising: Configure a second PRACH transport resource, which is used for PRACH retransmission; The configuration of the second PRACH transport resource includes: Configure the number of PRACH retransmissions and a first parameter, whereby the first parameter indicates the relationship between the number of PRACH retransmissions and the preamble.

2. The method according to claim 1, wherein, Configuring the second PRACH transport resource also includes: Configure a second parameter, which is used to indicate the first group of PRACH transmission timings corresponding to each PRACH repetition number in at least a portion of the PRACH repetition transmission numbers.

3. The method according to claim 2, wherein, The at least partial PRACH repeat transmission count includes each PRACH repeat transmission count except for the maximum PRACH repeat transmission count.

4. The method according to claim 1, wherein, The preamble associated with different numbers of PRACH retransmissions is different.

5. The method according to any one of claims 1-4, wherein, Configuring the second PRACH transport resource also includes: Configure a third parameter, which indicates the association between each SSB index and the preamble.

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 preambles, and the PRACH retransmission count includes Q PRACH retransmission counts. M mod Q = K, where K PRACH retransmissions are associated with P+1 preambles, and the other PRACH retransmissions besides the K PRACH retransmissions are associated with P preambles, and M and Q are both greater than or equal to 1.

7. The method according to any one of claims 2-3, wherein, The second parameter includes a bit sequence corresponding to each PRACH retransmission number. The sequence length of the bit sequence is equal to the maximum number of PRACH retransmissions among the PRACH retransmission numbers. Each bit in the bit sequence corresponds to a PRACH transmission timing, and the value of each bit in the bit sequence indicates whether to use the corresponding PRACH transmission timing for retransmission.

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

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

10. The method according to any one of claims 1-4, further comprising: Detection is performed at least a portion of the PRACH transmission timings in the second PRACH transmission resources to obtain the first preamble repeatedly transmitted by the user equipment (UE). The Random Access Radio Network Temporary Identifier RA-RNTI is determined based on one of the at least some PRACH transmission opportunities; The first downlink control information (DCI) is scrambled using the RA-RNTI to obtain the second DCI; Send the second DCI and the random access response (RAR) scheduled by the second DCI, the RAR carrying the random access preamble identifier RAPID of the first preamble.

11. The method according to claim 10, wherein, Configuring the second PRACH transport resource also includes: Configure a second parameter, which is used to indicate the first group of PRACH transmission timings corresponding to each PRACH repetition in at least a portion of the PRACH repetition transmissions; Wherein, the at least part of the PRACH transmission timings include the first group of PRACH transmission timings.

12. The method according to claim 11, wherein, Configuring the second PRACH transport resource also includes: Configure a fourth parameter, which is used to indicate the association between each SSB index and multiple PRACH transmission opportunities. The first group of PRACH transmission opportunities includes a second group of PRACH transmission opportunities corresponding to each PRACH repetition number in the at least some PRACH repetition transmission numbers in the multiple PRACH transmission opportunities associated with each SSB. Wherein, the at least part of the PRACH transmission timings include the second group of PRACH transmission timings.

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

14. The method according to claim 9, wherein, The timing of multiple PRACH transmissions associated with each SSB index does not overlap in the time domain.

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

16. The method according to any one of claims 1-4, wherein, The maximum number of PRACH repeat transmissions shall not exceed the number of PRACH transmission opportunities associated with each SSB index.

17. A PRACH retransmission method, applied on the network side, comprising: Send configuration information, which includes a second PRACH transmission resource for PRACH repetition transmission. The configuration information also includes the number of PRACH repetition transmissions and a first parameter, which indicates the association between the number of PRACH repetition transmissions and the preamble.

18. A PRACH retransmission method, applied to a UE, comprising: Receive configuration information, the configuration information including a second PRACH transmission resource, the second PRACH transmission resource being used for PRACH repeated transmission, the configuration information also including the number of PRACH repeated transmissions and a first parameter, the first parameter being used to indicate the association between the number of PRACH repeated transmissions and the preamble; Transmit the preamble according to the configuration information, including: determining the number of PRACH retransmissions m; Use the second PRACH transport resource to perform repeated PRACH transport.

19. The method according to claim 18, wherein, The preamble associated with different numbers of PRACH retransmissions is different.

20. The method according to claim 18, wherein, The configuration information also includes a second parameter, which is used to indicate the first group of PRACH transmission timings corresponding to each PRACH repetition in at least a portion of the PRACH repetition transmissions. The step of using the second PRACH transport resource to perform PRACH retransmission includes: The first group of PRACH transmission timings corresponding to the number of PRACH retransmissions m is determined based on the second parameter; The first preamble is transmitted m times during the first PRACH transmission time corresponding to the number of PRACH retransmissions m; The first preamble is a preamble associated with the number of PRACH retransmissions m.

21. The method according to claim 20, wherein, The at least partial PRACH repeat transmission count includes each PRACH repeat transmission count except for the maximum PRACH repeat transmission count.

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

23. The method according to claim 22, wherein: The first parameter is configured according to the third parameter, each SSB index is associated with M preambles, and the PRACH retransmission count includes Q PRACH retransmission counts. M mod Q = K, where K PRACH retransmissions are associated with P+1 preambles, and the other PRACH retransmissions besides the K PRACH retransmissions are associated with P preambles, and M and Q are both greater than or equal to 1. The first preamble belongs to the preamble associated with the number of PRACH retransmissions m among the M preambles associated with the SSB index selected by the UE.

24. The method according to any one of claims 20-23, wherein, The second parameter includes a bit sequence corresponding to each PRACH retransmission number. The sequence length of the bit sequence is equal to the maximum number of PRACH retransmissions among the PRACH retransmission numbers. Each bit in the bit sequence corresponds to a PRACH transmission timing, and the value of each bit in the bit sequence indicates whether to use the corresponding PRACH transmission timing for retransmission.

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

26. The method according to any one of claims 20-23, wherein, The configuration information also includes a fourth parameter, which is used to indicate the association between each SSB index and multiple PRACH transmission opportunities. The first group of PRACH transmission opportunities includes a second group of PRACH transmission opportunities corresponding to each PRACH repetition number in the at least some PRACH repetition transmission numbers among the multiple PRACH transmission opportunities associated with each SSB index. The step of repeatedly transmitting the first preamble m times at the first PRACH transmission time corresponding to the PRACH repeated transmission number m includes: In the multiple PRACH transmission opportunities associated with an SSB index selected by the UE, the first preamble is transmitted m times in the second group of PRACH transmission opportunities corresponding to the number of times the PRACH is repeatedly transmitted m times.

27. The method according to claim 26, wherein, The timing of multiple PRACH transmissions associated with each SSB index does not overlap in the time domain.

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

29. The method according to any one of claims 18-23, wherein, The maximum number of PRACH repeat transmissions shall not exceed the number of PRACH transmission opportunities associated with each SSB index.

30. The method according to any one of claims 20-23, further comprising: Receive the second DCI; RA-RNTI is determined based on one of the PRACH transmission opportunities in the first group of PRACH transmission opportunities corresponding to the number of PRACH repetitions m. The second DCI is descrambled using the RA-RNTI to obtain the first DCI; Receive RAR according to the first DCI.

31. The method according to claim 30, wherein: The configuration information also includes a fourth parameter, which is used to indicate the association 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 number of times each PRACH is repeatedly transmitted in the PRACH transmission opportunities associated with each SSB index. The PRACH transmission opportunity belongs to the second group of PRACH transmission opportunities that corresponds to the number of PRACH retransmissions m among the 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 timing is different in each second group of PRACH transmission timings, and the i-th PRACH transmission timing is the i-th PRACH transmission timing.

33. The method of claim 30, further comprising: If the RAR carries the RAPID of the first preamble, the subsequent random access procedure is executed.

34. A PRACH repeat transmission device, applied on the network side, comprising: The configuration module is configured to configure a second PRACH transport resource, which is used for PRACH retransmission; The configuration module is configured to configure the number of PRACH retransmissions and a first parameter, wherein the first parameter is used to indicate the association between the number of PRACH retransmissions and the preamble.

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

36. A PRACH retransmission device, applied to a UE, comprising: The receiving module is configured to receive configuration information, which includes a second PRACH transmission resource for PRACH retransmission. The configuration information also includes a number of PRACH retransmissions and a first parameter, which indicates the relationship between the number of PRACH retransmissions and the preamble. The transmission module is configured to transmit a preamble according to the configuration information, including: determining the number of PRACH retransmissions m; Use the second PRACH transport resource to perform repeated PRACH transport.

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

38. A base station, comprising: The apparatus as described in claim 34 or claim 35.

39. A user equipment, comprising: The apparatus as described in claim 36 or claim 37.

40. A PRACH repeat transfer system, comprising: The base station as described in claim 38 and the user equipment as described in claim 39.

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

42. A computer program product comprising a computer program, wherein, When the computer program is executed by a processor, it implements the method described in any one of claims 1-17 or 18-33.

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