Msg3 sending method, msg3 receiving method, apparatus, device, and readable storage medium

Abstract

The application discloses a Msg3 sending method, a Msg3 receiving method, a device, equipment and a readable storage medium. The Msg3 sending method comprises the following steps: determining an uplink beam of an initial transmission Msg3 or a retransmission Msg3 according to a predefined rule and / or an indication of a network device; and sending the initial transmission Msg3 through the uplink beam of the initial transmission Msg3, or sending the retransmission Msg3 through the uplink beam of the retransmission Msg3.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a method for sending Message 3 (Msg3), a method for receiving Message 3, an apparatus, a device, and a readable storage medium. Background Technology

[0002] In related technologies, the base station can instruct / schedule the terminal to repeatedly transmit the Physical Random Access Channel (PRACH). The beam used for repeated PRACH transmissions may be the same or different. Additionally, the base station can also instruct / schedule the terminal to repeatedly transmit the Msg3 Physical Uplink Shared Channel (PUSCH). Msg3 carries the RRC establishment request message, and its coverage performance directly affects the success probability of random access. The number of repetitions of PRACH and Msg3 PUSCH may be the same or different.

[0003] For Msg3, it can be specifically divided into the initial Msg3 and the retransmitted Msg3. The initial Msg3 is scheduled by the base station through the Random Access Response (RAR) information in Msg2, while the retransmitted Msg3 is scheduled by the gNB through Downlink Control Information (DCI) scrambled with a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI). It's important to note that the concepts of repetition and retransmission are not the same. Repetition of Msg3 means that the base station schedules the terminal to transmit Msg3 once, and the terminal transmits multiple Msg3 PUSCHs; retransmission of Msg3 means that after the base station schedules Msg3 for the first time (e.g., because the base station did not correctly demodulate the previously transmitted Msg3), it schedules the terminal to transmit Msg3 again. Both the initial Msg3 and the retransmitted Msg3 can be repetitive transmissions.

[0004] Currently, although the base station can instruct / schedule the terminal to repeatedly transmit Msg3 PUSCH, it does not instruct / schedule the uplink beam for Msg3. Therefore, the beam used by the terminal to transmit Msg3 is determined by the terminal itself, and the base station cannot determine the transmission beam for Msg3. Consequently, it is difficult to select a suitable receiving beam to receive Msg3, leading to a decrease in coverage performance. Determining the uplink beam for Msg3 is a problem that urgently needs to be solved. Summary of the Invention

[0005] This application provides a Msg3 transmission method, a Msg3 reception method, an apparatus, a device, and a readable storage medium, which can solve the problem of how to determine the uplink beam of Msg3.

[0006] Firstly, a Msg3 sending method is provided, applied to a terminal, including:

[0007] Determine the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to predefined rules and / or instructions from the network device.

[0008] The initial transmission Msg3 is transmitted via the uplink beam of the initial transmission Msg3, or the retransmission Msg3 is transmitted via the uplink beam of the retransmission Msg3.

[0009] Optionally, when determining the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to predefined rules, the predefined rules include one or more of the following:

[0010] The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the synchronization signal block SSB selected when the terminal initiates random access.

[0011] The uplink beam for the initial transmission Msg3 or the retransmission Msg3 is determined based on the Physical Random Access Channel (PRACH) sent by the terminal when initiating random access.

[0012] Optionally, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined based on the SSB selected when the terminal initiates random access, including:

[0013] When the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access.

[0014] or,

[0015] In the case where the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beam of all repeated transmissions of the initial transmission Msg3 or the retransmission Msg3 is the same.

[0016] or,

[0017] When the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined based on one or more of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, and the uplink beams of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 are the same or at least partially different.

[0018] Optionally, the uplink beam of the initial Msg3 or retransmitted Msg3 is determined based on one or more of the SSB selected by the terminal when initiating random access and the SSB actually sent by the network device, including:

[0019] Based on one or more of the SSB selected when the terminal initiates random access and the cyclic sequence of the SSBs actually sent by the network device, the SSB corresponding to the initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeated transmission of the initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeated transmission of the initial transmission Msg3 or retransmission Msg3 is determined.

[0020] or,

[0021] Based on one or more of the following factors—the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3—the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined.

[0022] Optionally, the uplink beam of the initial or retransmitted Msg3 is determined based on the PRACH sent by the terminal when initiating random access, including:

[0023] When the PRACH sent when the terminal initiates random access is a non-repeated transmission, or when the PRACH sent when the terminal initiates random access is a repeated transmission and the uplink beam of each PRACH is the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH.

[0024] or,

[0025] When the terminal initiates random access, the PRACH sent is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is the same as the uplink beam of the predefined PRACH.

[0026] or,

[0027] When the terminal initiates random access, the PRACH sent is a repeated transmission and the uplink beams of each repeated PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a repeated transmission, the uplink beam of the repeated initial transmission Msg3 or retransmission Msg3 is determined according to the uplink beam of the repeated PRACH, and the uplink beams of each repeated initial transmission Msg3 or retransmission Msg3 are the same or at least partially different.

[0028] Optionally, the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of Msg3 is determined based on the uplink beam of the repeated transmission of PRACH, including:

[0029] Based on one or more of the uplink beam of the first PRACH and the cyclical order of the uplink beams of the repeated PRACHs, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then based on the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission Msg3 or the retransmission Msg3.

[0030] or,

[0031] Based on one or more of the following: the uplink beam of the first PRACH, the cyclic order of the uplink beams of the repeatedly transmitted PRACHs, and the relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3 or the retransmission Msg3, the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 is determined. Then, based on the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3, the uplink beam of the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 is determined.

[0032] Optionally, the predefined rule convention or the network device's indication is used to indicate: determining the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial transmission Msg3.

[0033] Optionally, determining the uplink beam for retransmitted Msg3 based on the uplink beam of the initial Msg3 includes:

[0034] If the initial Msg3 is a non-repeated transmission, or if the initial Msg3 is a repeated transmission and the uplink beam of the initial Msg3 is the same, then the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the initial Msg3.

[0035] or,

[0036] When the initial transmission of Msg3 is a repeated transmission and the uplink beam of the initial transmission of Msg3 is at least partially different, the uplink beam of the retransmitted Msg3 is determined according to the method for determining the uplink beam of the initial transmission of Msg3.

[0037] Optionally, when determining the uplink beam for the initial transmission of Msg3 according to the instructions of the network device, the instructions of the network device include one or more of the following:

[0038] Random access response RAR information;

[0039] Downlink control information (DCI) for scheduling RAR;

[0040] System message;

[0041] The RAR information, the DCI that schedules the RAR, or the system message is used to indicate any of the following:

[0042] One or more indexes of reference SSBs;

[0043] One or more indexes of reference PRACH.

[0044] Optionally, when the uplink beam for retransmitting Msg3 is determined according to the instructions of the network device, the instructions of the network device include a DCI scrambled with the temporary cell radio network temporary identifier TC-RNTI.

[0045] The TC-RNTI scrambled DCI is used to indicate any of the following:

[0046] One or more indexes of reference SSBs;

[0047] One or more indexes referencing PRACH;

[0048] Indexes of one or more reference initial transmission Msg3 uplink beams.

[0049] Secondly, a Msg3 receiving method is provided, applicable to network devices, including:

[0050] According to predefined rules, determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3; and / or indicate the uplink beam of the initial transmission Msg3 or the retransmission Msg3 to the terminal.

[0051] Receive the initial transmission Msg3, or receive the retransmission Msg3;

[0052] Optionally, the initial transmission Msg3 can be received via the receiving beam corresponding to the uplink beam of the initial transmission Msg3, or the retransmission Msg3 can be received via the receiving beam corresponding to the uplink beam of the retransmission Msg3.

[0053] Optionally, when determining the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to predefined rules, the predefined rules include one or more of the following:

[0054] The uplink beam for the initial transmission Msg3 or the retransmission Msg3 is determined based on the SSB selected when the terminal initiates random access.

[0055] The uplink beam for the initial transmission Msg3 or the retransmission Msg3 is determined based on the PRACH sent when the terminal initiates random access.

[0056] Optionally, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined based on the SSB selected when the terminal initiates random access, including:

[0057] When the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access.

[0058] or,

[0059] In the case where the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beam of all repeated transmissions of the initial transmission or the retransmission Msg3 is the same.

[0060] or,

[0061] When the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined based on one or more of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, and the uplink beams of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 are the same or at least partially different.

[0062] Optionally, the uplink beam of the initial Msg3 or retransmitted Msg3 is determined based on the SSB selected by the terminal when initiating random access and the SSB actually transmitted by the network device, including:

[0063] Based on one or more of the SSB selected when the terminal initiates random access and the cyclic sequence of the SSBs actually sent by the network device, the SSB corresponding to the initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeated transmission of the initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeated transmission of the initial transmission Msg3 or retransmission Msg3 is determined.

[0064] or,

[0065] Based on one or more of the following factors—the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3—the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined.

[0066] Optionally, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined based on the PRACH sent when the terminal initiates random access, including:

[0067] When the PRACH is a non-repeating transmission, or when the PRACH is a repeating transmission and the uplink beam of each PRACH is the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH.

[0068] or,

[0069] When PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial or retransmitted Msg3 is a non-repeated transmission, the uplink beam of the initial or retransmitted Msg3 is the same as the uplink beam of the predefined PRACH.

[0070] or,

[0071] When the PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 of the repeated transmission is determined according to the uplink beam of the repeated transmission PRACH, and the uplink beams of the initial transmission Msg3 or retransmission Msg3 of each repeated transmission are the same or at least partially different.

[0072] Optionally, the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of Msg3 is determined based on the uplink beam of the repeated transmission of PRACH, including:

[0073] Based on the cyclic sequence of the uplink beam of the repeatedly transmitted PRACH, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then determine the uplink beam of the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 based on the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3.

[0074] or,

[0075] Based on one or more of the following factors—the cyclic order of the uplink beams of the repeatedly transmitted PRACHs and the relationship between the number of PRACHs and the number of repetitions of the initial or retransmitted Msg3—the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3 is determined. Then, based on the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3, the uplink beam of the repeatedly transmitted initial or retransmitted Msg3 is determined.

[0076] Optionally, determining the uplink beam for retransmitting Msg3 according to predefined rules includes:

[0077] Determine the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial transmission Msg3.

[0078] Optionally, determining the uplink beam for retransmitted Msg3 based on the uplink beam of the initial Msg3 includes:

[0079] If the initial Msg3 is a non-repeated transmission, or if the initial Msg3 is a repeated transmission and the uplink beam of the initial Msg3 is the same, then the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the initial Msg3.

[0080] or,

[0081] When the initial Msg3 is a repeated transmission and the uplink beam of the initial Msg3 is at least partially different, the uplink beam of the retransmitted Msg3 is determined according to the method for determining the uplink beam of the initial Msg3.

[0082] Optionally, the uplink beam for the initial transmission of Msg3 is indicated to the terminal, including:

[0083] The uplink beam for initial transmission of Msg3 is indicated to the terminal through one or more of the RAR information, the DCI that schedules RAR, and system messages.

[0084] The RAR information, the DCI that schedules the RAR, or the system message is used to indicate any one of the following: one or more reference SSB indices, or one or more reference PRACH indices.

[0085] Optionally, instructing the terminal to retransmit Msg3 via the uplink beam includes:

[0086] The uplink beam for retransmitting Msg3 is indicated to the terminal via DCI scrambled by TC-RNTI.

[0087] The TC-RNTI scrambled DCI is used to indicate any of the following:

[0088] One or more indexes of reference SSBs;

[0089] One or more indexes referencing PRACH;

[0090] Indexes of one or more reference initial transmission Msg3 uplink beams.

[0091] Thirdly, a Msg3 transmitting device is provided for use in a terminal, comprising:

[0092] The first processing module is used to determine the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 according to predefined rules and / or instructions from the network device.

[0093] The first transmitting module is used to transmit the initial transmission Msg3 via the uplink beam of the initial transmission Msg3, or to transmit the retransmission Msg3 via the uplink beam of the retransmission Msg3.

[0094] Optionally, when determining the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to predefined rules, the predefined rules include one or more of the following:

[0095] The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the synchronization signal block SSB selected when the terminal initiates random access.

[0096] The uplink beam for the initial transmission Msg3 or the retransmission Msg3 is determined based on the Physical Random Access Channel (PRACH) sent by the terminal when initiating random access.

[0097] Optionally, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined based on the SSB selected when the terminal initiates random access, including:

[0098] When the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access.

[0099] or,

[0100] In the case where the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beam of all repeated transmissions of the initial transmission Msg3 or the retransmission Msg3 is the same.

[0101] or,

[0102] When the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined based on one or more of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, and the uplink beams of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 are the same or at least partially different.

[0103] Optionally, the uplink beam of the initial Msg3 or retransmitted Msg3 is determined based on one or more of the SSB selected by the terminal when initiating random access and the SSB actually sent by the network device, including:

[0104] Based on one or more of the SSB selected when the terminal initiates random access and the cyclic sequence of the SSBs actually sent by the network device, the SSB corresponding to the initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeated transmission of the initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeated transmission of the initial transmission Msg3 or retransmission Msg3 is determined.

[0105] or,

[0106] Based on one or more of the following factors—the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3—the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined.

[0107] Optionally, the uplink beam of the initial or retransmitted Msg3 is determined based on the PRACH sent by the terminal when initiating random access, including:

[0108] When the PRACH sent when the terminal initiates random access is a non-repeated transmission, or when the PRACH sent when the terminal initiates random access is a repeated transmission and the uplink beam of each PRACH is the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH.

[0109] or,

[0110] When the terminal initiates random access, the PRACH sent is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is the same as the uplink beam of the predefined PRACH.

[0111] or,

[0112] When the terminal initiates random access, the PRACH sent is a repeated transmission and the uplink beams of each repeated PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a repeated transmission, the uplink beam of the repeated initial transmission Msg3 or retransmission Msg3 is determined according to the uplink beam of the repeated PRACH, and the uplink beams of each repeated initial transmission Msg3 or retransmission Msg3 are the same or at least partially different.

[0113] Optionally, the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of Msg3 is determined based on the uplink beam of the repeated transmission of PRACH, including:

[0114] Based on one or more of the uplink beam of the first PRACH and the cyclical order of the uplink beams of the repeated PRACHs, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then based on the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission Msg3 or the retransmission Msg3.

[0115] or,

[0116] Based on one or more of the following: the uplink beam of the first PRACH, the cyclic order of the uplink beams of the repeatedly transmitted PRACHs, and the relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3 or the retransmission Msg3, the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 is determined. Then, based on the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3, the uplink beam of the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 is determined.

[0117] Optionally, the predefined rule convention or the network device's indication is used to indicate: determining the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial transmission Msg3.

[0118] Optionally, determining the uplink beam for retransmitted Msg3 based on the uplink beam of the initial Msg3 includes:

[0119] If the initial Msg3 is a non-repeated transmission, or if the initial Msg3 is a repeated transmission and the uplink beam of the initial Msg3 is the same, then the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the initial Msg3.

[0120] or,

[0121] When the initial transmission of Msg3 is a repeated transmission and the uplink beam of the initial transmission of Msg3 is at least partially different, the uplink beam of the retransmitted Msg3 is determined according to the method for determining the uplink beam of the initial transmission of Msg3.

[0122] Fourthly, a Msg3 receiving device is provided for use in network equipment, comprising:

[0123] The second processing module is used to determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3 according to predefined rules; and / or to indicate the uplink beam of the initial transmission Msg3 or the retransmission Msg3 to the terminal.

[0124] The first receiving module is used to receive the initial transmission Msg3 or the retransmission Msg3.

[0125] Optionally, when determining the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to predefined rules, the predefined rules include one or more of the following:

[0126] The uplink beam for the initial transmission Msg3 or the retransmission Msg3 is determined based on the SSB selected when the terminal initiates random access.

[0127] The uplink beam for the initial transmission Msg3 or the retransmission Msg3 is determined based on the PRACH sent when the terminal initiates random access.

[0128] Optionally, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined based on the SSB selected when the terminal initiates random access, including:

[0129] When the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access.

[0130] or,

[0131] In the case where the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beam of all repeated transmissions of the initial transmission or the retransmission Msg3 is the same.

[0132] or,

[0133] When the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined based on one or more of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, and the uplink beams of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 are the same or at least partially different.

[0134] Optionally, the uplink beam of the initial Msg3 or retransmitted Msg3 is determined based on the SSB selected by the terminal when initiating random access and the SSB actually transmitted by the network device, including:

[0135] Based on one or more of the SSB selected when the terminal initiates random access and the cyclic sequence of the SSBs actually sent by the network device, the SSB corresponding to the initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeated transmission of the initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeated transmission of the initial transmission Msg3 or retransmission Msg3 is determined.

[0136] or,

[0137] Based on one or more of the following factors—the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3—the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined.

[0138] Optionally, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined based on the PRACH sent when the terminal initiates random access, including:

[0139] When the PRACH is a non-repeating transmission, or when the PRACH is a repeating transmission and the uplink beam of each PRACH is the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH.

[0140] or,

[0141] When PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial or retransmitted Msg3 is a non-repeated transmission, the uplink beam of the initial or retransmitted Msg3 is the same as the uplink beam of the predefined PRACH.

[0142] or,

[0143] When the PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 of the repeated transmission is determined according to the uplink beam of the repeated transmission PRACH, and the uplink beams of the initial transmission Msg3 or retransmission Msg3 of each repeated transmission are the same or at least partially different.

[0144] Optionally, the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of Msg3 is determined based on the uplink beam of the repeated transmission of PRACH, including:

[0145] Based on the cyclic sequence of the uplink beam of the repeatedly transmitted PRACH, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then determine the uplink beam of the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 based on the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3.

[0146] or,

[0147] Based on one or more of the following factors—the cyclic order of the uplink beams of the repeatedly transmitted PRACHs and the relationship between the number of PRACHs and the number of repetitions of the initial or retransmitted Msg3—the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3 is determined. Then, based on the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3, the uplink beam of the repeatedly transmitted initial or retransmitted Msg3 is determined.

[0148] Fifthly, a communication device is provided, comprising: a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the steps of the method described in the first or second aspect.

[0149] A sixth aspect provides a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first or second aspect.

[0150] In this embodiment, without increasing the indication overhead, the network device can determine the uplink beam of the initial or retransmitted Msg3 sent by the UE, so that a more suitable receiving beam can be used to receive the initial or retransmitted Msg3. Alternatively, the network device can flexibly instruct the UE to transmit the uplink beam when transmitting the initial or retransmitted Msg3 as needed, so that the most suitable receiving strategy can be selected when receiving Msg3, such as performing merging or joint detection, or increasing beam diversity gain, thereby improving the coverage performance of Msg3. Attached Figure Description

[0151] Figure 1 It is a schematic diagram of the 4-step RACH;

[0152] Figure 2 It is a schematic diagram of the application scenario of the embodiment of the present application;

[0153] Figure 3 It is a flowchart of the Msg3 sending method provided by the embodiment of the present application;

[0154] Figure 4 It is a flowchart of the Msg3 receiving method provided by the embodiment of the present application;

[0155] Figure 5 It is a schematic diagram of the UE determining the uplink beam of Msg3 according to the SSB provided by the embodiment of the present application;

[0156] Figure 6 It is a schematic diagram that the beams of multiple repeated Msg3s provided by the embodiment of the present application are different, N<M and N is an integer multiple of M;

[0157] Figure 7 It is a schematic diagram that the beams of multiple repeated Msg3s provided by the embodiment of the present application are different, N<M and N does not have to be an integer multiple of M;

[0158] Figure 8 It is a schematic diagram that the beams of multiple repeated Msg3s provided by the embodiment of the present application are different, N>M and N is an integer multiple of M;

[0159] Figure 9 It is a schematic diagram that the beams of multiple repeated Msg3s provided by the embodiment of the present application are different, N>M and N does not have to be an integer multiple of M;

[0160] Figure 10 It is a schematic diagram of the Msg3 sending device provided by the embodiment of the present application;

[0161] Figure 11 It is a flowchart of the Msg3 receiving device provided by the embodiment of the present application;

[0162] Figure 12 It is a schematic diagram of the communication device provided by the embodiment of the present application. Detailed implementation manners

[0163] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the present application.

[0164] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0165] The beams in this article can also be described as spatial filters or spatial relation information. For example, the uplink beam transmitted by the terminal can be called an uplink spatial filter, or the downlink beam transmitted by the base station can be called downlink spatial relation information, and so on. Therefore, similar descriptions can be considered equivalent.

[0166] To facilitate understanding of the technical solution of this application, the following technical points are introduced:

[0167] In 5G New Radio (NR) systems, the increased frequency of wireless system deployment leads to greater propagation loss of wireless signals, resulting in shorter transmission distances and reduced network coverage. This is particularly true for uplink transmissions—transmissions from user equipment (UEs) and reception by next-generation node Bs (gNBs)—where the UE's transmission power is lower, making uplink coverage more limited than downlink coverage.

[0168] Message 3 (Msg3) is an important uplink channel in the 4-step RACH procedure. It carries the Radio Resource Control (RRC) establishment request message sent by the UE. A 4-step RACH procedure is as follows: Figure 1 As shown.

[0169] After obtaining the Random Access Channel (RACH) configuration information, the UE successfully performs the 4-step RACH process, which can be roughly summarized as follows:

[0170] Step 1: The UE selects a target synchronization signal and PBCH block (SSB) (such as an SSB whose reference signal received power (RSRP) is greater than a certain threshold).

[0171] Step 2: The UE sends message 1 (Msg1) (Physical Random Access Channel (PRACH)) in the random access opportunity (RachOccasion, RO) associated with the selected SSB according to the RACH configuration information.

[0172] Step 3: The UE receives message 2 (Msg2) (Random Access Response (RAR)) sent by the base station;

[0173] Step 4: The UE sends message 3 (Msg3) according to the RAR instructions;

[0174] Step 5: The UE receives message 4 (Msg4) sent by the base station.

[0175] It is evident that the gNB's ability to correctly receive the Msg3 signal sent by the UE directly affects the UE's ability to successfully access the cell; therefore, the coverage performance of Msg3 is particularly important. UEs located at the cell edge or in basements, where signal attenuation is high, experience significant transmission loss of radio signals (such as Msg3), thus requiring coverage enhancement.

[0176] Repeated transmission of Msg3 is not supported in Release 15 (Rel-15) and Release 16 (Rel-16). To improve Msg3 coverage performance, NR Release 17 (Rel-17) supports repeated transmission of Msg3. Furthermore, Release 18 (Rel-18) will also support repeated transmission of message 1 (Msg1), i.e., PRACH.

[0177] For Rel-18 NR base stations and UEs, the base station can instruct / schedule the UE to repeatedly transmit PRACH; the beam used for repeated PRACH transmissions may be the same or different. Additionally, the base station can also instruct / schedule the UE to repeatedly transmit Msg3. The number of times PRACH is repeated may be the same as or different from the number of times Msg3 is repeated on the Physical Uplink Shared Channel (PUSCH).

[0178] Currently, the protocol does not specify how the UE determines the uplink beam for the initial or retransmitted Msg3.

[0179] For the base station, since the uplink beam of the initial or retransmitted Msg3 by the UE is uncertain, the performance improvement that the base station can achieve in receiving Msg3 is relatively small.

[0180] (1) Since the uplink beams of each Msg3 in the initial or retransmission of repeated transmissions may be different, the base station cannot combine the signals between each Msg3 before demodulation. It can only demodulate each Msg3 PUSCH separately, resulting in small performance improvement.

[0181] (2) Since the base station does not know the uplink beam of each Msg3, it cannot adjust the receiving beam of each Msg3 accordingly, and even for a single Msg3, the best reception effect cannot be obtained.

[0182] The embodiments of this application can be applied to 5G NR systems, including network equipment and terminals. It is understood that the embodiments of this application can also be applied to other systems, such as 6G systems, as long as the terminal needs to repeatedly transmit data channels during the initial access process.

[0183] See Figure 2 The following illustration demonstrates the applicable scenario of this application embodiment. Multiple UEs, including UE1 and UE2, initiate random access to the base station, requesting wireless network connection services; the base station receives random access requests from at least one UE and provides wireless services to it. Data interaction and transmission occur between the base station and UE1 and UE2 via wireless communication.

[0184] See Figure 3 This application provides a method for sending Msg3. The execution subject of this method can be a terminal, and the specific steps include: step 301 and step 302.

[0185] Step 301: Determine the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to predefined rules and / or instructions from the network device;

[0186] In this article, Msg3 can also be replaced by Msg3 PUSCH. That is, the initial transmission of Msg3 can be replaced by the initial transmission of Msg3 PUSCH, and the retransmission of Msg3 can be replaced by the retransmission of Msg3 PUSCH.

[0187] Step 302: Transmit the initial Msg3 through the uplink beam of the initial Msg3, or transmit the retransmitted Msg3 through the uplink beam of the retransmitted Msg3.

[0188] In the embodiments of this application, the terminal can determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3 according to predefined rules and / or the instructions of the network device (for example, the instructions of the network device may be explicit signaling or implicit signaling). In this way, the terminal can determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3, and the network device (such as the base station) can also select a suitable detection scheme according to the determined uplink beam of Msg3, thereby improving the detection performance of Msg3 and thus improving the coverage performance of the network device.

[0189] In one embodiment of this application, when determining the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to predefined rules, the predefined rules include one or more of the following:

[0190] Rule 1: The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

[0191] Rule 2: The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the PRACH sent when the terminal initiates random access.

[0192] Optionally, rule 1 above includes at least one of the following:

[0193] Rule 1-a) When the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access.

[0194] Rule 1-b) If the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam determination method for the initial transmission Msg3 or the retransmission Msg3 includes at least one of the following:

[0195] Rule 1-b1) In the case that the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beam of all repeated transmissions of the initial transmission Msg3 or the retransmission Msg3 is the same.

[0196] That is, all repeated initial transmissions of Msg3 or retransmissions of Msg3 have the same beam, and are determined according to the SSB selected when the UE initiates random access.

[0197] Rule 1-b2) In the case that the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined based on one or more of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, and the uplink beams of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 are the same or at least partially different.

[0198] That is, the uplink beams of the initial transmission Msg3 or retransmission Msg3 that are repeatedly transmitted may be different. The uplink beams of the initial transmission Msg3 or retransmission Msg3 that are repeatedly transmitted are determined according to the SSB selected by the UE when initiating random access and the SSB actually sent by the network device.

[0199] Optionally, rule 1-b2 above may further include at least one of the following:

[0200] Rule 1-b2-1) Based on one or more of the SSB selected when the terminal initiates random access and the cyclic sequence of the SSBs actually sent by the network device, determine the SSB corresponding to the initial transmission Msg3 or retransmission Msg3, and then determine the uplink beam of the repeated transmission Msg3 or retransmission Msg3 based on the SSB corresponding to the initial transmission Msg3 or retransmission Msg3.

[0201] Rule 1-b2-2) Based on one or more of the following: the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, determine the SSB corresponding to the repeated initial transmission Msg3 or retransmission Msg3. Then, based on the SSB corresponding to the repeated initial transmission Msg3 or retransmission Msg3, determine the uplink beam of the repeated initial transmission Msg3 or retransmission Msg3.

[0202] Optionally, rule 2 above includes at least one of the following:

[0203] Rule 2-a) When the PRACH is a non-repeating transmission, or when the PRACH is a repeating transmission and the uplink beam of each PRACH is the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH.

[0204] That is, if the PRACH is a non-repeating transmission, or if the PRACH is a repeating transmission and each PRACH has the same uplink beam, then the uplink beam of the initial transmission Msg3 or the retransmission Msg3 (in repeating or non-repeating transmission) is the same as the uplink beam of the PRACH.

[0205] Rule 2-b) When a PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial Msg3 or retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial Msg3 or retransmission Msg3 is the same as the uplink beam of the predefined PRACH (e.g., the first PRACH).

[0206] That is, the PRACH is a repeated transmission and the uplink beams of each repeated PRACH are at least partially different, and the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of a non-repeated transmission is the same as the uplink beam of the predefined PRACH (e.g., the first PRACH). The predefined PRACH can also be a PRACH that can be uniquely determined in other ways.

[0207] Among them, the uplink beams of each repeated PRACH are at least partially different, including but not limited to the uplink beams of any one PRACH being different from the uplink beams of the other PRACHs.

[0208] Rule 2-c) When the PRACH is a repeated transmission and the uplink beams of each repeated PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 of the repeated transmission is determined based on the uplink beam of the repeated PRACH, and the uplink beams of the initial transmission Msg3 or retransmission Msg3 of each repeated transmission are the same or at least partially different.

[0209] That is, the PRACH is repeatedly transmitted and each PRACH has a different uplink beam, and the uplink beam of the initial transmission Msg3 or the retransmission Msg3 in the repeated transmission may be different, determined by the uplink beam of the repeatedly transmitted PRACH.

[0210] Optionally, rule 2-c above may further include at least one of the following:

[0211] Rule 2-c-1) Based on the cyclic order of the uplink beam of the repeatedly transmitted PRACH, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then determine the uplink beam of the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 based on the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3.

[0212] Rule 2-c-2) Based on one or more of the following factors—the cyclic order of the uplink beams of the repeatedly transmitted PRACHs and the relationship between the number of PRACHs and the number of repetitions of the initial or retransmitted Msg3—determine the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3. Then, based on the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3, determine the uplink beam of the repeatedly transmitted initial or retransmitted Msg3.

[0213] In one embodiment of this application, determining the uplink beam for retransmitting Msg3 according to predefined rules and / or instructions from network devices includes:

[0214] Determine the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial transmission Msg3.

[0215] That is, according to predefined rules, it can be agreed that the uplink beam of the retransmitted Msg3 is determined based on the uplink beam of the initial Msg3, or the network device can instruct that the uplink beam of the retransmitted Msg3 is determined based on the uplink beam of the initial Msg3.

[0216] In one embodiment of this application, determining the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial Msg3 includes one of the following:

[0217] Method 1) If the initial Msg3 is a non-repeated transmission, or if the initial Msg3 is a repeated transmission and the uplink beam of the initial Msg3 is the same, the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the initial Msg3.

[0218] Method 2) If the initial transmission of Msg3 is a repeated transmission and the uplink beam of the initial transmission of Msg3 is at least partially different, the uplink beam of the retransmitted Msg3 is determined according to the method for determining the uplink beam of the initial transmission of Msg3.

[0219] That is, the method for determining the uplink beam of the retransmitted Msg3 can be the same as the method for determining the uplink beam of the initial Msg3.

[0220] In one embodiment of this application, when determining the uplink beam of the initial transmission Msg3 according to the instructions of the network device, the instructions of the network device include one or more of the following:

[0221] (1) Random Access Response (RAR) information;

[0222] (2) Schedule the downlink control information (DCI) of the RAR;

[0223] (3) System Information (SI), such as System Information Block 1 (SIB1).

[0224] In one embodiment of this application, the RAR information, the DCI that schedules the RAR, or the system message (e.g., system information block 1) is used to indicate any of the following:

[0225] (1) An index of one or more reference SSBs;

[0226] (2) One or more indexes of reference PRACH.

[0227] In one embodiment of this application, when the uplink beam for retransmitting Msg3 is determined according to the instructions of the network device, the instructions of the network device include a DCI scrambled with a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI).

[0228] In one embodiment of this application, the TC-RNTI scrambled DCI is used to indicate any of the following:

[0229] (1) An index of one or more reference SSBs;

[0230] (2) One or more indexes of reference PRACH;

[0231] (3) Indexes of one or more reference initial transmission Msg3 uplink beams.

[0232] In this embodiment, without increasing the indication overhead, the network device can determine the uplink beam of the initial or retransmitted Msg3 sent by the UE, so that a more suitable receiving beam can be used to receive the initial or retransmitted Msg3. Alternatively, the network device can flexibly instruct the UE to transmit the uplink beam when transmitting the initial or retransmitted Msg3 as needed, so that the most suitable receiving strategy can be selected when receiving Msg3, such as performing merging or joint detection, or increasing beam diversity gain, thereby improving the coverage performance of Msg3.

[0233] See Figure 4 This application provides a method for receiving Msg3. The subject of this method includes a network device, such as a base station, and the specific steps include: step 401 and step 402.

[0234] Step 401: Determine the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to the predefined rules; and / or, indicate the uplink beam for the initial transmission Msg3 or the retransmission Msg3 to the terminal.

[0235] Step 402: Receive the initial transmission Msg3, or receive the retransmission Msg3.

[0236] It is understood that network devices can receive the initial transmission Msg3 or the retransmission Msg3 through the receiving beam corresponding to the uplink beam of the initial transmission Msg3 or the retransmission Msg3. In one embodiment of this application, when the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to predefined rules, the predefined rules include one or more of the following:

[0237] Rule 1: The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

[0238] Rule 2: The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the PRACH sent when the terminal initiates random access.

[0239] In one embodiment of this application, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, including:

[0240] When the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access.

[0241] or,

[0242] In the case where the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beam of all repeated transmissions of the initial transmission or the retransmission Msg3 is the same.

[0243] or,

[0244] When the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined based on one or more of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, and the uplink beams of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 are the same or at least partially different.

[0245] In one embodiment of this application, the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of Msg3 is determined based on the SSB selected by the terminal when initiating random access and the SSB actually transmitted by the network device, including:

[0246] Based on the SSB selected when the terminal initiates random access and the cyclic order of the SSBs actually sent by the network device, the SSB corresponding to the initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeated transmission of the initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeated transmission of the initial transmission Msg3 or retransmission Msg3 is determined.

[0247] or,

[0248] Based on one or more of the following factors—the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3—the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined.

[0249] In one embodiment of this application, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined based on the PRACH sent when the terminal initiates random access, including:

[0250] When the PRACH is a non-repeating transmission, or when the PRACH is a repeating transmission and the uplink beam of each PRACH is the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH.

[0251] or,

[0252] When PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial or retransmitted Msg3 is a non-repeated transmission, the uplink beam of the initial or retransmitted Msg3 is the same as the uplink beam of the predefined PRACH.

[0253] or,

[0254] When the PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 of the repeated transmission is determined according to the uplink beam of the repeated transmission PRACH, and the uplink beams of the initial transmission Msg3 or retransmission Msg3 of each repeated transmission are the same or at least partially different.

[0255] In one embodiment of this application, the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of Msg3 is determined based on the uplink beam of the repeated transmission of PRACH, including:

[0256] Based on the cyclic sequence of the uplink beam of the repeatedly transmitted PRACH, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then determine the uplink beam of the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 based on the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3.

[0257] or,

[0258] Based on one or more of the following factors—the cyclic order of the uplink beams of the repeatedly transmitted PRACHs and the relationship between the number of PRACHs and the number of repetitions of the initial or retransmitted Msg3—the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3 is determined. Then, based on the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3, the uplink beam of the repeatedly transmitted initial or retransmitted Msg3 is determined.

[0259] In one embodiment of this application, determining the uplink beam for retransmitting Msg3 according to predefined rules includes:

[0260] Determine the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial transmission Msg3.

[0261] In one embodiment of this application, determining the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial Msg3 includes:

[0262] If the initial Msg3 is a non-repeated transmission, or if the initial Msg3 is a repeated transmission and the uplink beam of the initial Msg3 is the same, then the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the initial Msg3.

[0263] or,

[0264] When the initial transmission of Msg3 is a repeated transmission and the uplink beam of the initial transmission of Msg3 is at least partially different, the uplink beam of the retransmitted Msg3 is determined according to the method for determining the uplink beam of the initial transmission of Msg3.

[0265] In one embodiment of this application, instructing the terminal to transmit the uplink beam of Msg3 initially includes:

[0266] The uplink beam of the initial Msg3 is indicated to the terminal through one or more of the RAR information, the DCI of the scheduling RAR, and the SI.

[0267] In one embodiment of this application, the RAR information, the DCI or SI of the scheduled RAR is used to indicate any one of the following: (1) an index of one or more reference SSBs, or (2) an index of one or more reference PRACHs.

[0268] In one embodiment of this application, instructing the terminal to retransmit the uplink beam of Msg3 includes:

[0269] The uplink beam of Msg3 is indicated to the terminal via DCI scrambled by TC-RNTI.

[0270] In one embodiment of this application, the TC-RNTI scrambled DCI is used to indicate any of the following:

[0271] (1) An index of one or more reference SSBs;

[0272] (2) One or more indexes of reference PRACH;

[0273] (3) Indexes of one or more reference initial transmission Msg3 uplink beams.

[0274] In this embodiment, without increasing the indication overhead, the network device can determine the uplink beam of the initial or retransmitted Msg3 sent by the UE, so that a more suitable receiving beam can be used to receive the initial or retransmitted Msg3. Alternatively, the network device can flexibly instruct the UE to transmit the uplink beam when transmitting the initial or retransmitted Msg3 as needed, so that the most suitable receiving strategy can be selected when receiving Msg3, such as performing merging or joint detection, or increasing beam diversity gain, thereby improving the coverage performance of Msg3.

[0275] The implementation methods of this application are described below through Examples 1, 2, 3 and 4.

[0276] Example 1

[0277] This embodiment describes how to determine the uplink beam of the initial transmission Msg3 using predefined rules.

[0278] The first type of method in this embodiment is mainly related to the SSB. The uplink beam of the initial transmission Msg3 can be determined based on the SSB selected when the UE initiates random access, as well as predefined rules.

[0279] Case 1-1: The initial transmission of Msg3 is a non-repeated transmission.

[0280] In this case, the uplink beam of the initial transmission Msg3 can be determined based on the SSB selected by the UE when initiating random access.

[0281] For example, based on the reciprocity of the wireless communication channel, the optimal beam for receiving the SSB can be used as the uplink beam for transmitting the initial Msg3.

[0282] See Figure 5 The base station transmits four SSBs (SSB0, SSB1, SSB2, and SSB3), and the UE has three receive beams (Rxbeam 0, Rx beam 1, and Rx beam 2). The UE selects SSB 1 as the target SSB to initiate random access. Among the three receive beams, the UE has the highest signal strength and best performance when using Rx beam 1 to receive the SSB. Therefore, the UE uses the uplink beam or transmit beam corresponding to Rx beam 1 as the uplink / transmit beam for the initial transmission of Msg3.

[0283] Case 1-2: The initial transmission of Msg3 is a duplicate transmission.

[0284] In this case, the uplink beam determination method for the initial transmission Msg3 includes:

[0285] Method 1: The uplink beam of the initial transmission Msg3 is the same for all repeated transmissions, and it is determined according to the SSB selected when the UE initiates random access (Method 1 in Case 1-2 is the same as Case 1-1 above, that is, the uplink beam of the initial transmission Msg3 is determined according to the SSB selected when the UE initiates random access).

[0286] Method 2: Determine the uplink beam of the initial transmission Msg3 for repeated transmission based on one or more of the SSB selected by the UE when initiating random access and the SSB actually transmitted by the base station.

[0287] Specifically, for the first initial transmission Msg3, the uplink beam of the first initial transmission Msg3 can be determined according to the SSB selected by the UE when initiating random access, referring to the method in case 1-1 of Method 1. Except for the first initial transmission Msg3, other initial transmission Msg3 can be determined by sequential association based on the SSB selected during random access and the sequence of the cyclic index of the SSB actually sent by the base station.

[0288] The sequence of cyclic indices of SSBs actually sent by the base station can represent the cyclic order of SSBs actually sent by the network device.

[0289] For example, with Figure 5For example, the actual cyclic index sequence of SSBs sent by the base station is 0-1-2-3-0-1-2-3……; if the first initial transmission Msg3 (Msg3 0 in the figure) determines the uplink beam based on SSB1, then the SSBs corresponding to subsequent initial transmissions Msg3 need to be sequentially associated starting from SSB1. That is, the second initial transmission Msg3 (Msg3 1 in the figure) determines the uplink beam based on SSB2, the third initial transmission Msg3 (Msg3 2 in the figure) determines the uplink beam based on SSB3, the fourth initial transmission Msg3 (Msg3 3 in the figure) determines the uplink beam based on SSB0, the fifth initial transmission Msg3 (Msg3 4 in the figure) determines the uplink beam based on SSB1, and so on.

[0290] For example, the uplink beam of the repeated initial transmission Msg3 can be determined based on the SSB actually sent by the base station. The cyclic index sequence of the SSB actually sent by the base station is 0-1-2-3-0-1-2-3... Then the 1st, 2nd... Kth initial transmission Msg3 determines the uplink beam based on the 1st, 2nd... Kth index of the cyclic index sequence 0-1-2-3-0-1-2-3... That is, the first initial transmission Msg3 determines the uplink beam based on SSB0, the second initial transmission Msg3 determines the uplink beam based on SSB1, and so on.

[0291] Method 3: Determine the uplink beam of the initial transmission Msg3 for multiple repeated transmissions based on one or more of the following: the SSB selected by the UE when initiating random access, the SSB actually transmitted by the base station, the number of SSBs actually transmitted by the base station, and the number of repetitions of the initial transmission Msg3.

[0292] Specifically, it is necessary to determine the SSB corresponding to the repeated initial transmission Msg3 based on the relationship between the number of SSBs N actually transmitted by the base station and the number of repetitions M of the initial transmission Msg3, and then determine the uplink beam of the repeated initial transmission Msg3 based on the corresponding SSB.

[0293] (1) If M = N, then the initial transmission Msg3 and SSB of repeated transmission correspond one-to-one; the first initial transmission Msg3 determines its uplink beam according to the SSB selected during random access, and the other Msg3 determines the SSB according to the sequence of the cyclic index of the SSB actually sent by the base station, and then determines the uplink beam of the initial transmission Msg3 according to the SSB.

[0294] (2) If N≤M, that is, the number of SSBs is less than or equal to the number of times the initial Msg3 is repeated, in this case, each SSB corresponds to multiple Msg3s; the SSB corresponding to the first Msg3 is the SSB selected by the UE during random access, while the correspondence between other Msg3s and SSBs is determined by sequential association based on the sequence of cyclic indices of the SSBs actually sent by the base station, with the SSB index selected by the UE during random access as the starting index, where:

[0295] a) If it is stipulated that M and N must be integer multiples of each other, then each SSB corresponds to M / N Msg3s, and different SSBs correspond to different sets of Msg3s, such as... Figure 6 As shown.

[0296] For example, in the diagram, SSB0 corresponds to Msg3 4 and Msg3 5, SSB1 corresponds to Msg3 0 and Msg3 1, and SSB2 corresponds to Msg32 and Msg3 3.

[0297] b) If it is permissible for M and N to be not necessarily integer multiples, then the preceding... Each SSB corresponds to Msg3, then Each SSB corresponds to Each Msg3 has a different set of Msg3s depending on the SSB. Figure 7 As shown.

[0298] For example, in the diagram, SSB0 corresponds to Msg3 5, SSB1 corresponds to Msg3 0 and Msg3 1, SSB2 corresponds to Msg3 4, and SSB3 corresponds to Msg3 2 and Msg3 3.

[0299] (3) If N≥M, that is, the number of SSBs is greater than or equal to the number of times the initial Msg3 is repeated, then each Msg3 corresponds to multiple SSBs; the SSB corresponding to the first Msg3 is the SSB selected by the UE during random access, while the correspondence between other Msg3s and SSBs is determined by sequential association based on the sequence of cyclic indices of the SSBs actually sent by the network device, with the SSB index selected by the UE during random access as the starting index, where:

[0300] a) If it is stipulated that N and M must be integer multiples of each other, then each Msg3 corresponds to N / M SSBs, and different Msg3s correspond to different sets of SSBs, such as... Figure 8 As shown.

[0301] For example, in the diagram, SSB1 and SSB2 correspond to Msg3 0, and SSB3 and SSB0 correspond to Msg3 1.

[0302] b) If it is permissible for N and M to be not necessarily integer multiples of each other, then the preceding... Each Msg3 corresponds to One SSB, then Each Msg3 corresponds to Each SSB has a different set of SSBs corresponding to different Msg3s, such as Figure 9 As shown.

[0303] For example, in the diagram, SSB1 and SSB2 correspond to Msg3 0, and SSB0 corresponds to Msg3 1.

[0304] From the perspective of the uplink beam for transmitting Msg3, since the optimal receive beam for each SSB may be different, the uplink beam for Msg3 corresponding to different SSBs may also be different. If one Msg3 corresponds to multiple SSBs, the UE can select one of the multiple corresponding SSBs to determine the uplink beam when transmitting Msg3.

[0305] The second type of method in this embodiment is mainly related to PRACH. The uplink beam of the initial transmission Msg3 is determined based on the uplink beam of the PRACH sent by the UE and predefined rules.

[0306] Case 2-1: PRACH is a non-repeating transmission, or PRACH is a repeating transmission and the uplink beams of each PRACH are the same.

[0307] In this scenario, if the initial Msg3 transmission is non-repeating, its uplink beam is the same as the PRACH uplink beam; if the initial Msg3 transmission is repeating, the uplink beam of all repeating initial Msg3 transmissions is the same as the PRACH uplink beam. That is, regardless of whether Msg3 is repeating, its uplink beam is the same as the PRACH uplink beam.

[0308] Case 2-2: PRACH is a repeated transmission and the uplink beams of each repeated PRACH are different, while the initial transmission Msg3 is a non-repeated transmission.

[0309] The uplink beams of repeated PRACH transmissions are different, which can also be considered as each PRACH corresponding to a different SSB. In this case, the uplink beam of the initial transmission Msg3 is the same as the uplink beam of a certain predefined PRACH.

[0310] For example, a predefined PRACH can be the first PRACH in a series of repeatedly transmitted PRACHs. A predefined PRACH can also be a PRACH that can be uniquely identified in other ways.

[0311] Case 2-3: PRACH is repeatedly transmitted and the uplink beams of each repeatedly transmitted PRACH are different, and the initial transmission Msg3 is also repeatedly transmitted.

[0312] Understandably, for cases 2-3, we can refer to methods two and three of cases 1-2, and replace "SSB selected when the UE initiates random access" with "first PRACH" and "SSB actually sent by the base station" with "repeatedly transmitted PRACH" in methods two and three of cases 1-2.

[0313] The specific description is as follows:

[0314] Method 1: Determine the uplink beam of the first PRACH based on one or more of the cyclical order of the uplink beams of the first PRACH and the repeated transmissions of the PRACH.

[0315] Specifically, for the first initial transmission Msg3, the uplink beam of the initial transmission Msg3 can be determined based on the uplink beam of the first PRACH, referring to the method in Case 1-1. Except for the first initial transmission Msg3, the uplink beams of other initial transmission Msg3 can be determined based on the uplink beam of the first PRACH, the cyclic order of the uplink beams of the repeatedly transmitted PRACH, and the relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3.

[0316] Method 2: Determine the uplink beams of multiple repeated transmissions of the initial transmission Msg3 based on one or more of the following: the uplink beam of the first PRACH, the cyclic order of the uplink beams of the repeated transmissions of PRACH, and the relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3.

[0317] Specifically, it is necessary to determine the PRACH corresponding to the repeated transmission of Msg3 based on the relationship between the number N of repeated transmissions of PRACH and the number of repetitions of the initial transmission of Msg3, and then determine the uplink beam of the initial transmission of Msg3 based on the corresponding PRACH.

[0318] (1) If M = N, then the initial transmission Msg3 of repeated transmission corresponds one-to-one with PRACH; the first initial transmission Msg3 determines the beam according to the first PRACH, and the other Msg3 determines the PRACH according to the cyclic order of the uplink beams of the repeated transmission PRACH, and determines the uplink beam of the initial transmission Msg3 according to the PRACH.

[0319] (2) If N≤M, that is, the number of PRACHs is less than or equal to the number of times the initial Msg3 is repeated, in this case, each PRACH corresponds to multiple Msg3s; the PRACH corresponding to the first Msg3 is the first PRACH, and the correspondence between other Msg3s and PRACHs is determined according to the cyclic order of the uplink beams of the PRACH (i.e., the sequence of the cyclic indexes of the uplink beams of the PRACH), and with the index of the uplink beam of the PRACH selected by the UE during random access as the starting index, the sequential association is performed, where:

[0320] a) If it is stipulated that M and N must be multiples of each other, then each PRACH corresponds to M / N Msg3, and different PRACHs correspond to different Msg3 sets.

[0321] b) If it is permissible for M and N to be not necessarily integer multiples, then the preceding... Each PRACH corresponds to Msg3, then Each PRACH corresponds to There are Msg3 values, and different Msg3 sets correspond to different PRACH values.

[0322] (3) If N≥M, that is, the number of PRACHs is greater than or equal to the number of times the initial Msg3 is repeated, in this case, each Msg3 corresponds to multiple PRACHs; the PRACH corresponding to the first Msg3 is the first PRACH, and the correspondence between other Msg3s and PRACHs is determined according to the cyclic order of the uplink beams of the PRACHs, and with the index of the uplink beam of the PRACH selected by the UE during random access as the starting index, and the order is determined by sequential association, where:

[0323] a) If it is stipulated that N and M must be multiples of each other, then each Msg3 corresponds to N / M PRACHs, and different Msg3s correspond to different sets of PRACHs.

[0324] b) If it is permissible for N and M to be not necessarily integer multiples of each other, then the preceding... Each Msg3 corresponds to One PRACH, then Each Msg3 corresponds to Each PRACH has a different set of PRACHs for different Msg3s.

[0325] From the perspective of the uplink beam for transmitting Msg3, since the optimal receive beam for each PRACH may be different, the uplink beam for Msg3 corresponding to different PRACHs may also be different. If one Msg3 corresponds to multiple PRACHs, the UE can choose one of the multiple corresponding PRACHs to determine the uplink beam when transmitting Msg3.

[0326] In this embodiment, without increasing indication overhead, the network device can determine the uplink beam of the initial transmission Msg3 sent by the UE, thereby using a more suitable receiving beam to receive the initial transmission Msg3. For repeated transmissions of the initial transmission Msg3, if the uplink beam of each repeated transmission is the same, the network device can perform signal combining before demodulation. This is superior to demodulating each Msg3 separately when the channel changes gradually. If the uplink beams of each repeated transmission Msg3 are different, the network device can use the optimal beam for reception and demodulation, achieving beam diversity gain and improving coverage performance when the channel changes rapidly.

[0327] Example 2

[0328] This embodiment describes how the beam of the initial transmission Msg3 is determined by the indication of the network device.

[0329] In this embodiment, the indication from the network device can be an indication message (e.g., a first indication message) indicating the uplink beam of the initial transmission Msg3. This first indication message can be carried in a RAR message, sent in the DCI that schedules the RAR, or broadcast in a system message (such as SIB1).

[0330] (1) The first type of method in this embodiment is mainly related to SSB.

[0331] The first indication information can indicate only one SSB, such as the index of an SSB. When the first indication information indicates an SSB, the uplink beam of the initial transmission Msg3 is determined according to the indicated SSB. If Msg3 is a repeated transmission, the uplink beam of all repeated transmissions of the initial transmission Msg3 is the same and is determined according to the indicated SSB.

[0332] Alternatively, the first indication information can also indicate multiple SSBs. This method is suitable for cases where the initial Msg3 is a repeated transmission, in which case the uplink beams of each repeated Msg3 transmission may be different.

[0333] For example, the initial indication information can be indicated by a bitmap to specify the SSB corresponding to multiple initial Msg3 transmissions. Each K bits in the bitmap is used to indicate a maximum of 2 SSBs corresponding to one initial Msg3 transmission. K Which of the SSBs?

[0334] Example 1: When K=2, the four states {00, 01, 10, 11} represented by the bit information in the first indication information correspond to SSB0, SSB1, SSB2, and SSB3, respectively.

[0335] Example 2: Suppose an initial Msg3 is transmitted 3 times, then a total of 2 × 3 = 6 bits are needed to indicate the SSB corresponding to the initial Msg3. For example, the first indication information of Bitmap = "001110" indicates that the first initial Msg3 corresponds to SSB0 (00), the second initial Msg3 corresponds to SSB3 (11), and the third initial Msg3 corresponds to SSB2 (10).

[0336] For example, the first indication information can indicate one of several association patterns. An association pattern refers to the pattern between the repeatedly transmitted initial transmission Msg3 and its associated SSB. Association patterns can be predefined or indicated by the base station through system information broadcast. For example, assuming an initial transmission Msg3 is repeatedly transmitted 3 times, and there are a total of 4 SSBs (SSB0, SSB1, SSB2, SSB3), several association patterns can be predefined:

[0337] pattern1={SSB0-SSB1-SSB2},

[0338] pattern2={SSB1-SSB2-SSB3},

[0339] pattern3={SSB0-SSB2-SSB0},

[0340] ...

[0341] For example, when the first indication information indicates pattern2, the three initial transmissions Msg3 are sequentially associated with SSB1, SSB2, and SSB3, and each initial transmission Msg3 can determine the uplink beam based on its associated SSB.

[0342] (2) The second type of method in this embodiment is mainly related to PRACH.

[0343] The first indication information can indicate only one PRACH, such as an index of a PRACH; when the first indication information indicates one PRACH, the uplink beam of the initial transmission Msg3 is determined according to the indicated PRACH; if the initial transmission Msg3 is a repeated transmission, then the uplink beam of all repeated transmissions of the initial transmission Msg3 is the same and is determined according to the indicated PRACH.

[0344] Alternatively, the first indication information can also indicate multiple PRACHs. This method is suitable for cases where the initial Msg3 is repeatedly transmitted, in which case the uplink beams of each repeated initial Msg3 transmission may be different.

[0345] For example, the initial indication information can be indicated by a bitmap to specify the PRACH corresponding to multiple initial Msg3 transmissions. Each K bits in the bitmap is used to indicate a maximum of 2 PRACHs corresponding to one initial Msg3 transmission. K Which one of the PRACH?

[0346] Example 1: When K=2, the four states {00, 01, 10, 11} represented by the bit information in the first indication information correspond to PRACH0, PRACH1, PRACH2, and PRACH3, respectively.

[0347] Example 2: Suppose an initial Msg3 is transmitted 3 times, then a total of 2*3=6 bits are needed to indicate the PRACH corresponding to the initial Msg3. For example, the first indication information of Bitmap="001110" indicates that the first initial Msg3 corresponds to PRACH0 (00), the second initial Msg3 corresponds to PRACH3 (11), and the third initial Msg3 corresponds to PRACH2 (10).

[0348] For example, the first indication information can indicate one of several association patterns. An association pattern refers to the pattern of the initial Msg3 transmission and its associated PRACH. Association patterns can be predefined or indicated by the base station through system information broadcast. For example, assuming an Msg3 is transmitted three times, and there are a total of four PRACHs (PRACH0, PRACH1, PRACH2, PRACH3), several association patterns can be predefined:

[0349] pattern1={PRACH0-PRACH1-PRACH2},

[0350] pattern2={PRACH1-PRACH2-PRACH3},

[0351] pattern3={PRACH0-PRACH2-PRACH0},

[0352] ...

[0353] For example, when the first indication information indicates pattern2, the three initial transmissions Msg3 are sequentially associated with PRACH1, PRACH2, and PRACH3, and each initial transmission Msg3 can determine the uplink beam based on its associated PRACH.

[0354] In this case, the beam of each initial transmission Msg3 is the same as the beam of its associated PRACH.

[0355] Using the method in this embodiment, the base station can flexibly instruct the UE to transmit the uplink beam of the initial Msg3 according to the requirements, so that the most suitable reception strategy can be selected when receiving the initial Msg3, such as performing merging or joint detection, or increasing beam diversity gain, thereby improving the coverage performance of Msg3.

[0356] It should be noted that the method in this embodiment can also be considered as determining the uplink beam of PRACH by combining "predefined rules" with "indications from network devices", that is, determining the beam of the initial transmission Msg3 by combining "predefined rules" with "indications from network devices".

[0357] Example 3

[0358] This embodiment describes how to determine the beam for retransmitting Msg3 using predefined rules. The retransmission of Msg3 is scheduled using DCI scrambling with TC-RNTI.

[0359] In the first type of method of this embodiment, the uplink beam for retransmitting Msg3 can be determined according to the method of Embodiment 1. That is, the predefined rules in Embodiment 1 can also be used to determine the uplink beam for retransmitting Msg3.

[0360] However, it should be noted that this only indicates that the (multiple) methods described in Example 1 can be used for both the initial transmission of Msg3 and the retransmission of Msg3. In the first type of method in Example 3, the uplink beam of the retransmitted Msg3 can be different from and independent of the uplink beam of the initial transmission of Msg3.

[0361] For example, the initial transmission of Msg3 is a repeated transmission, and multiple uplink beams for the initial transmission of Msg3 are determined according to Method 2 in Case 1-2 of Embodiment 1, and each uplink beam may be different; the retransmission of Msg3 is also a repeated transmission, but multiple uplink beams for the retransmission of Msg3 are determined according to Method 1 in Case 1-2 of Embodiment 1, and each uplink beam is the same.

[0362] In the second type of method of this embodiment, the uplink beam of the retransmitted Msg3 is associated with the uplink beam of the initial Msg3. More precisely, the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the initial Msg3, or the method for determining the uplink beam of the retransmitted Msg3 can be the same as the method for determining the uplink beam of the initial Msg3.

[0363] Specifically, this includes the following situations:

[0364] Case 2-1: Retransmitted Msg3 is not retransmitted, or retransmitted Msg3 is retransmitted and uses the same uplink beam.

[0365] In this case, regardless of whether the retransmission of Msg3 is a duplicate transmission, the uplink beam of each retransmission of Msg3 is the same as the uplink beam of the initial transmission of Msg3. When the UE sends a retransmission of Msg3, the uplink beam it uses is the same as the uplink beam used when sending the initial transmission of Msg3.

[0366] This design is simple to implement and is particularly suitable for scenarios where the UE moves slowly. In this case, the UE has already used the optimal uplink beam when initially transmitting Msg3. When the base station schedules the UE to retransmit Msg3, since the UE moves slowly and its position remains basically unchanged, the optimal beam is likely still unchanged. In this case, using the uplink beam of the initial Msg3 transmission as the uplink beam for retransmitting Msg3 can still achieve good performance.

[0367] Case 2-2: Msg3 is retransmitted repeatedly and using a different uplink beam.

[0368] In this case, the multiple repeated transmissions of Msg3 in the retransmission may (e.g., by the method in Example 1) correspond to different SSBs or different PRACHs, and therefore the uplink beams may also be different. In Case 2-2, the "method for determining" the uplink beam of the retransmission Msg3 is the same as the "method for determining" the uplink beam of the initial transmission Msg3.

[0369] For example, if the initial transmission of Msg3 is a repeated transmission, and multiple uplink beams for Msg3 are determined according to Method 2 of Case 1-2 in Embodiment 1, each uplink beam may be different; if the retransmission of Msg3 is also a repeated transmission, then multiple uplink beams for the retransmitted Msg3 are also determined according to Method 2 of Case 1-2 in Embodiment 1, each uplink beam may be different. It should be noted that in this case, only the "determination method" is the same, not the "number of repetitions". The number of repetitions can be the same or different.

[0370] This design is simple to implement and is particularly suitable for scenarios where the UE moves at high speeds. In this case, using different uplink beams can achieve higher beam diversity gain, while making the uplink beam determination method for the initial transmission Msg3 and the retransmission Msg3 the same. On the one hand, beam diversity gain can be utilized, and on the other hand, the implementation of network equipment can be simplified, allowing network equipment to use the same or similar receive beam adjustment strategy to receive the initial transmission Msg3 and the retransmission Msg3.

[0371] It should be noted that other beneficial effects of Embodiment 3 can be referenced from those of Embodiment 1. That is, through the method in this embodiment, the network device can determine the uplink beam of the retransmitted Msg3 sent by the UE without increasing the indication overhead, so that a more suitable receiving beam can be used to receive the retransmitted Msg3. In the case of repeated transmission of Msg3, if the uplink beam of each repeated transmission of Msg3 is the same, the base station can first perform signal combining and then demodulation. When the channel changes slowly, the performance is better than demodulating each Msg3 separately. In the case of different uplink beams of each repeated transmission of Msg3, the base station can use the optimal beam for reception and demodulation respectively. When the channel changes rapidly, beam diversity gain can be obtained, improving coverage performance.

[0372] Example 4

[0373] This embodiment describes how the beam for retransmitting Msg3 is determined by indication from the network device. The retransmission of Msg3 is scheduled using DCI scrambling with TC-RNTI.

[0374] In the first type of method of this embodiment, the uplink beam of the retransmitted Msg3 can be determined according to the method of embodiment 2. That is, the explicit indication method in embodiment 2 can be used to determine the uplink beam of the retransmitted Msg3: by using an explicit indication information, denoted as the second indication information, to indicate the index of one or more SSBs or PRACHs, and determining the uplink beam of the retransmitted Msg3 according to the method in embodiment 2.

[0375] However, it should be noted that since the retransmission of Msg3 is scheduled through a DCI scrambled by TC-RNTI, rather than through a RAR message, for the method using explicit indication (Example 2), the second indication information can be sent in a DCI scrambled by TC-RNTI (instead of a RAR message, or a DCI that schedules RAR).

[0376] In the second method of this embodiment, the uplink beam of the retransmitted Msg3 is associated with the uplink beam of the original Msg3. More precisely, this is achieved through an explicit indication message, denoted as the second indication message, which indicates the index of one or more reference original Msg3s; the uplink beam of the retransmitted Msg3 is determined based on the uplink beam of the reference original Msg3 indicated by the second indication message.

[0377] The second indication information may indicate only one retransmitted Msg3, for example, it may indicate the index of a retransmitted Msg3; or the second indication information may also indicate multiple retransmitted Msg3, for example, by indicating the index of multiple retransmitted Msg3 through a bitmap, or by indicating one of several associated patterns.

[0378] For example, the second indication information can be indicated by a bitmap to show the original Msg3 corresponding to a plurality of retransmitted Msg3s. Each K bits in the bitmap is used to indicate a maximum of 2 K bits corresponding to a retransmitted Msg3. K Which one of the initial Msg3 transmissions?

[0379] Example 1: When K=2, the four states {00,01,10,11} represented by the bit information in the second indication information correspond to the initial transmission Msg3 PUSCH 0, initial transmission Msg3 PUSCH 1, initial transmission Msg3 PUSCH 2, and initial transmission Msg3 PUSCH 3, respectively.

[0380] Example 2: Assuming a retransmitted Msg3 is transmitted 3 times, a total of 2*3=6 bits are needed to indicate the original Msg3 PUSCH corresponding to the retransmitted Msg3. For example, a second indication information with Bitmap="001110" indicates that the first retransmitted Msg3 corresponds to the original Msg3 PUSCH 0 (00), the second retransmitted Msg3 corresponds to the original Msg3 PUSCH 3 (11), and the third retransmitted Msg3 corresponds to the original Msg3 PUSCH 2 (10).

[0381] For example, the second indication information can indicate one of several association patterns. An association pattern refers to the pattern between a retransmitted Msg3 and its associated primary Msg3. Association patterns can be predefined or indicated by the base station through system information broadcast. For instance, assuming a retransmitted Msg3 is transmitted 3 times, and there are a total of 4 primary Msg3 PUSCHs (primary Msg3 PUSCH 0, primary Msg3 PUSCH 1, primary Msg3 PUSCH 2, and primary Msg3 PUSCH 3), several association patterns can be predefined:

[0382] pattern1 = {initial Msg3 PUSCH 0 - initial Msg3 PUSCH 1 - initial Msg3 PUSCH 2},

[0383] pattern2 = {initial Msg3 PUSCH 1 - initial Msg3 PUSCH 2 - initial Msg3 PUSCH 3},

[0384] pattern3 = {initial Msg3 PUSCH 0 - initial Msg3 PUSCH 2 - initial Msg3 PUSCH 0},

[0385] ...

[0386] For example, when the second indication information indicates pattern2, the three retransmissions Msg3 are sequentially associated with the initial transmission Msg3PUSCH 1, initial transmission Msg3PUSCH 2, and initial transmission Msg3PUSCH 3. Thus, each retransmission Msg3 can determine the uplink beam based on its associated initial transmission Msg3PUSCH.

[0387] The uplink beam of each retransmitted Msg3 is the same as the uplink beam of its associated initial Msg3 (as indicated by the second indication information).

[0388] Using the method in this embodiment, the network device can flexibly instruct the UE to transmit the uplink beam when retransmitting Msg3 according to the requirements, so that the most suitable reception strategy can be selected when receiving the retransmitted Msg3, such as performing merging or joint detection, or increasing beam diversity gain, thereby improving the coverage performance of Msg3.

[0389] It is understood that the method in this embodiment can also be considered as determining the uplink beam of PRACH by combining "predefined rules" with "indications from network devices", that is, determining the uplink beam of retransmitted Msg3 by "predefined rules and indications from network devices".

[0390] See Figure 10 This application provides a Msg3 transmitting device for a terminal. The device 1000 includes:

[0391] The first processing module 1001 is used to determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3 according to predefined rules and / or instructions from the network device.

[0392] In this article, Msg3 can also be replaced by Msg3 PUSCH. That is, the initial transmission of Msg3 can be replaced by the initial transmission of Msg3 PUSCH, and the retransmission of Msg3 can be replaced by the retransmission of Msg3 PUSCH.

[0393] The first transmitting module 1002 is used to transmit the initial transmission Msg3 through the uplink beam of the initial transmission Msg3, or to transmit the retransmission Msg3 through the uplink beam of the retransmission Msg3.

[0394] In the embodiments of this application, the terminal can determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3 according to predefined rules and / or the instructions of the network device (explicit signaling or implicit signaling). The network device can also select a suitable detection scheme according to the determined uplink beam of Msg3, thereby improving the detection performance of Msg3 and thus improving the coverage performance of the network device.

[0395] In one embodiment of this application, when determining the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to predefined rules, the predefined rules include one or more of the following:

[0396] Rule 1: The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

[0397] Rule 2: The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the PRACH sent when the terminal initiates random access.

[0398] Optionally, rule 1 above includes at least one of the following methods:

[0399] Rule 1-a) When the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access.

[0400] Rule 1-b) If the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam determination method for the initial transmission Msg3 or the retransmission Msg3 shall be one of the following:

[0401] Rule 1-b1) In the case that the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beam of all repeated transmissions of the initial transmission Msg3 or the retransmission Msg3 is the same.

[0402] That is, all repeated initial transmissions of Msg3 or retransmissions of Msg3 have the same beam, and are determined according to the SSB selected when the UE initiates random access.

[0403] Rule 1-b2) In the case that the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined based on one or more of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, and the uplink beams of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 are the same or at least partially different.

[0404] That is, the uplink beams of the initial transmission Msg3 or the retransmission Msg3 may be different when they are repeatedly transmitted; the uplink beams of the initial transmission Msg3 or the retransmission Msg3 are determined according to the SSB selected when the UE initiates random access and the SSB actually sent by the network device.

[0405] Optionally, rule 1-b2 above may further include one of the following:

[0406] Rule 1-b2-1) Based on one or more of the SSB selected when the terminal initiates random access and the cyclic sequence of the SSBs actually sent by the network device, determine the SSB corresponding to the initial transmission Msg3 or retransmission Msg3, and then determine the uplink beam of the repeated transmission Msg3 or retransmission Msg3 based on the SSB corresponding to the initial transmission Msg3 or retransmission Msg3.

[0407] Rule 1-b2-2) Based on one or more of the following: the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, determine the SSB corresponding to the repeated initial transmission Msg3 or retransmission Msg3. Then, based on the SSB corresponding to the repeated initial transmission Msg3 or retransmission Msg3, determine the uplink beam of the repeated initial transmission Msg3 or retransmission Msg3.

[0408] Optionally, rule 2 above includes at least one of the following methods:

[0409] Rule 2-a) When the PRACH is a non-repeating transmission, or when the PRACH is a repeating transmission and the uplink beam of each PRACH is the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH.

[0410] That is, if the PRACH is a non-repeating transmission, or if the PRACH is a repeating transmission and each PRACH has the same uplink beam, then the uplink beam of the initial transmission Msg3 or the retransmission Msg3 (in repeating or non-repeating transmission) is the same as the uplink beam of the PRACH.

[0411] Rule 2-b) When a PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is the same as the uplink beam of a predefined PRACH (e.g., the first PRACH).

[0412] That is, the PRACH is a repeated transmission and the uplink beams of each repeated PRACH are at least partially different, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the non-repeated transmission are the same as the uplink beams of the predefined PRACH (such as the first PRACH).

[0413] Rule 2-c) When the PRACH is a repeated transmission and the uplink beams of each repeated PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 of the repeated transmission is determined based on the uplink beam of the repeated PRACH, and the uplink beams of the initial transmission Msg3 or retransmission Msg3 of each repeated transmission are the same or at least partially different.

[0414] That is, the PRACH is repeatedly transmitted and each PRACH has a different uplink beam, and the uplink beam of the initial transmission Msg3 or the retransmission Msg3 in the repeated transmission may be different, determined by the uplink beam of the repeatedly transmitted PRACH.

[0415] Optionally, rule 2-c above may further include one of the following:

[0416] Rule 2-c-1) Based on the cyclic order of the uplink beam of the repeatedly transmitted PRACH, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then determine the uplink beam of the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 based on the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3.

[0417] Rule 2-c-2) Based on one or more of the following factors—the cyclic order of the uplink beams of the repeatedly transmitted PRACHs and the relationship between the number of PRACHs and the number of repetitions of the initial or retransmitted Msg3—determine the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3. Then, based on the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3, determine the uplink beam of the repeatedly transmitted initial or retransmitted Msg3.

[0418] In one embodiment of this application, determining the uplink beam for retransmitting Msg3 according to predefined rules and / or instructions from network devices includes:

[0419] Determine the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial transmission Msg3.

[0420] That is, according to predefined rules, it can be agreed that the uplink beam of the retransmitted Msg3 is determined based on the uplink beam of the initial Msg3, or the network device can instruct that the uplink beam of the retransmitted Msg3 is determined based on the uplink beam of the initial Msg3.

[0421] In one embodiment of this application, determining the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial Msg3 includes one of the following:

[0422] Method 1) If the initial Msg3 is a non-repeated transmission, or if the initial Msg3 is a repeated transmission and the uplink beam of the initial Msg3 is the same, the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the initial Msg3.

[0423] Method 2) If the initial transmission of Msg3 is a repeated transmission and the uplink beam of the initial transmission of Msg3 is at least partially different, the uplink beam of the retransmitted Msg3 is determined according to the method for determining the uplink beam of the initial transmission of Msg3.

[0424] That is, the method for determining the uplink beam of the retransmitted Msg3 can be the same as the method for determining the uplink beam of the initial Msg3.

[0425] In one embodiment of this application, when determining the uplink beam of the initial transmission Msg3 according to the instructions of the network device, the instructions of the network device include one or more of the following:

[0426] (1) RAR information;

[0427] (2) Schedule the DCI of RAR;

[0428] (3) System messages, such as SIB1.

[0429] In one embodiment of this application, the RAR information, the DCI that schedules the RAR, or the system message is used to indicate any one of the following:

[0430] (1) An index of one or more reference SSBs;

[0431] (2) One or more indexes of reference PRACH.

[0432] In one embodiment of this application, when the uplink beam for retransmitting Msg3 is determined according to the instructions of the network device, the instructions of the network device include TC-RNTI scrambled DCI.

[0433] In one embodiment of this application, the TC-RNTI scrambled DCI is used to indicate any of the following:

[0434] (1) An index of one or more reference SSBs;

[0435] (2) One or more indexes of reference PRACH;

[0436] (3) Indexes of one or more reference initial transmission Msg3 uplink beams.

[0437] In the embodiments of this application, the device is capable of implementing this application. Figure 3 The various processes implemented in the method embodiments shown, and the same beneficial effects achieved, will not be described again here to avoid repetition.

[0438] See Figure 11 This application provides a Msg3 receiving device, applied to a network device. The device 1100 includes:

[0439] The second processing module 1101 is used to determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3 according to predefined rules; and / or to indicate the uplink beam of the initial transmission Msg3 or the retransmission Msg3 to the terminal.

[0440] The first receiving module 1102 is used to receive the initial transmission Msg3 or the retransmission Msg3.

[0441] In one embodiment of this application, when determining the uplink beam for the initial transmission Msg3 or the retransmission Msg3 according to predefined rules, the predefined rules include one or more of the following:

[0442] Rule 1: The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

[0443] Rule 2: The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the PRACH sent when the terminal initiates random access.

[0444] In one embodiment of this application, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, including:

[0445] When the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access.

[0446] or,

[0447] In the case where the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beam of all repeated transmissions of the initial transmission or the retransmission Msg3 is the same.

[0448] or,

[0449] When the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined based on one or more of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, and the uplink beams of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 are the same or at least partially different.

[0450] In one embodiment of this application, the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of Msg3 is determined based on the SSB selected by the terminal when initiating random access and the SSB actually transmitted by the network device, including:

[0451] Based on the SSB selected when the terminal initiates random access and the cyclic order of the SSBs actually sent by the network device, the SSB corresponding to the initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeated transmission of the initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeated transmission of the initial transmission Msg3 or retransmission Msg3 is determined.

[0452] or,

[0453] Based on one or more of the following factors—the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3—the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined. Then, based on the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3, the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined.

[0454] In one embodiment of this application, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined based on the PRACH sent when the terminal initiates random access, including:

[0455] When the PRACH is a non-repeating transmission, or when the PRACH is a repeating transmission and the uplink beam of each PRACH is the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH.

[0456] or,

[0457] When PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial or retransmitted Msg3 is a non-repeated transmission, the uplink beam of the initial or retransmitted Msg3 is the same as the uplink beam of the predefined PRACH.

[0458] or,

[0459] When the PRACH is a repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 of the repeated transmission is determined according to the uplink beam of the repeated transmission PRACH, and the uplink beams of the initial transmission Msg3 or retransmission Msg3 of each repeated transmission are the same or at least partially different.

[0460] In one embodiment of this application, the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of Msg3 is determined based on the uplink beam of the repeated transmission of PRACH, including:

[0461] Based on the cyclic sequence of the uplink beam of the repeatedly transmitted PRACH, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then determine the uplink beam of the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3 based on the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or the retransmission Msg3.

[0462] or,

[0463] Based on one or more of the following factors—the cyclic order of the uplink beams of the repeatedly transmitted PRACHs and the relationship between the number of PRACHs and the number of repetitions of the initial or retransmitted Msg3—the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3 is determined. Then, based on the PRACH corresponding to the repeatedly transmitted initial or retransmitted Msg3, the uplink beam of the repeatedly transmitted initial or retransmitted Msg3 is determined.

[0464] In one embodiment of this application, determining the uplink beam for retransmitting Msg3 according to predefined rules includes:

[0465] Determine the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial transmission Msg3.

[0466] In one embodiment of this application, determining the uplink beam of the retransmitted Msg3 based on the uplink beam of the initial Msg3 includes:

[0467] If the initial Msg3 is a non-repeated transmission, or if the initial Msg3 is a repeated transmission and the uplink beam of the initial Msg3 is the same, then the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the initial Msg3.

[0468] or,

[0469] When the initial Msg3 is a repeated transmission and the uplink beam of the initial Msg3 is at least partially different, the uplink beam of the retransmitted Msg3 is determined according to the method for determining the uplink beam of the initial Msg3.

[0470] In one embodiment of this application, instructing the terminal to transmit the uplink beam of Msg3 initially includes:

[0471] The uplink beam for initial transmission of Msg3 is indicated to the terminal via one or more of the following: RAR information, DCI scheduling RAR, and system messages.

[0472] In one embodiment of this application, the RAR information, the DCI that schedules the RAR, or the system message is used to indicate any one of the following: (1) an index of one or more reference SSBs, or (2) an index of one or more reference PRACHs.

[0473] In one embodiment of this application, instructing the terminal to retransmit the uplink beam of Msg3 includes:

[0474] The uplink beam of Msg3 is indicated to the terminal via DCI scrambled by TC-RNTI.

[0475] In one embodiment of this application, the TC-RNTI scrambled DCI is used to indicate any of the following:

[0476] (1) An index of one or more reference SSBs;

[0477] (2) One or more indexes of reference PRACH;

[0478] (3) Indexes of one or more reference initial transmission Msg3 uplink beams.

[0479] In the embodiments of this application, the device is capable of implementing this application. Figure 4 The various processes implemented in the method embodiments shown, and the same beneficial effects achieved, will not be described again here to avoid repetition.

[0480] Optional, such as Figure 12 As shown, this application embodiment also provides a communication device 1200, including a processor 1201, a memory 1202, and a program or instructions stored in the memory 1202 and executable on the processor 1201. When the program or instructions are executed by the processor 1201, they implement the above-mentioned... Figure 3 or Figure 4 The various processes of the method embodiments shown can achieve the same technical effect, and will not be described again here to avoid repetition.

[0481] This application embodiment also provides a readable storage medium storing a program or instructions that, when executed by a processor, implement the above-described functionality. Figure 3 or Figure 4 The various processes of the method embodiments shown can achieve the same technical effect, and will not be described again here to avoid repetition.

[0482] The processor mentioned above is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0483] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above information processing method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0484] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0485] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0486] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0487] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A message Msg3 sending method applied to a terminal, characterized in that, Comprising: determining an uplink beam of an initial transmission Msg3 or a retransmission Msg3 according to a predefined rule and / or an indication of a network device; sending the initial transmission Msg3 through the uplink beam of the initial transmission Msg3, or sending the retransmission Msg3 through the uplink beam of the retransmission Msg3; wherein, in the case of determining the uplink beam of the initial transmission Msg3 or the retransmission Msg3 according to the predefined rule, the predefined rule comprises one or more of the following: the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to a synchronization signal block (SSB) selected when the terminal initiates random access; the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to a physical random access channel (PRACH) sent when the terminal initiates random access; wherein, in the case of determining the uplink beam of the initial transmission Msg3 according to the indication of the network device, the indication of the network device comprises one or more of the following: random access response (RAR) information; downlink control information (DCI) scheduling the RAR; a system message; wherein the RAR information, the DCI scheduling the RAR, or the system message is used to indicate any of the following: an index of one or more reference SSBs; an index of one or more reference PRACHs; wherein, in the case of determining the uplink beam of the retransmission Msg3 according to the indication of the network device, the indication of the network device comprises a DCI scrambled by a temporarily used cell radio network temporary identifier (TC-RNTI); wherein the DCI scrambled by the TC-RNTI is used to indicate any of the following: an index of one or more reference SSBs; an index of one or more reference PRACHs; an index of one or more reference uplink beams of the initial transmission Msg3.

2. The method of claim 1, wherein, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to a SSB selected when the terminal initiates random access, comprising: in the case of the initial transmission Msg3 or the retransmission Msg3 being non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to a SSB selected when the terminal initiates random access; or, in the case of the initial transmission Msg3 or the retransmission Msg3 being repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is determined according to a SSB selected when the terminal initiates random access, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of all the repeated transmissions are the same; or, in the case of the initial transmission Msg3 or the retransmission Msg3 being repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is determined according to one or more of a SSB selected when the terminal initiates random access and a SSB actually sent by the network device, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partially different.

3. The method of claim 2, wherein, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is determined according to one or more of a SSB selected when the terminal initiates random access and a SSB actually sent by the network device, comprising: According to one or more of the SSB selected by the terminal when initiating random access and the cyclic order of the SSB actually transmitted by the network device, the SSB corresponding to the initial transmission Msg3 or retransmission Msg3 is determined, and then according to the SSB corresponding to the initial transmission Msg3 or retransmission Msg3, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is determined. Or, According to one or more of the SSB selected by the terminal when initiating random access, the cyclic order of the SSB actually transmitted by the network device, and the relationship between the number of SSBs actually transmitted by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, the SSB corresponding to the initial transmission Msg3 or retransmission Msg3 is determined, and then according to the SSB corresponding to the initial transmission Msg3 or retransmission Msg3, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is determined.

4. The method of claim 1, wherein, The uplink beam of the initial transmission or retransmission Msg3 is determined according to the PRACH transmitted by the terminal when initiating random access, including: In the case that the PRACH transmitted by the terminal when initiating random access is non-repeated transmission, or in the case that the PRACH transmitted by the terminal when initiating random access is repeated transmission and the uplink beams of each PRACH are the same, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is the same as the uplink beam of the PRACH; Or, In the case that the PRACH transmitted by the terminal when initiating random access is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is non-repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is the same as the uplink beam of the predefined PRACH; Or, In the case that the PRACH transmitted by the terminal when initiating random access is repeated transmission and the uplink beams of each repeated PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is determined according to the uplink beam of the repeated PRACH, and the uplink beams of each repeated initial transmission Msg3 or retransmission Msg3 are the same or at least partially different.

5. The method of claim 4, wherein, The uplink beam of the initial transmission Msg3 or retransmission Msg3 is determined according to the uplink beam of the repeated PRACH, including: According to one or more of the uplink beam of the first PRACH and the cyclic order of the uplink beam of the repeated PRACH, the PRACH corresponding to the initial transmission Msg3 or retransmission Msg3 is determined, and then according to the PRACH corresponding to the initial transmission Msg3 or retransmission Msg3, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is determined; Or, According to one or more of the following, the uplink beam of the repeated initial Msg3 or the repeated Msg3 is determined: the uplink beam of the first PRACH, the cyclic order of the uplink beams of the repeated PRACH, and the relationship between the number of PRACHs and the number of repetitions of the initial Msg3 or the repeated Msg3.

6. The method of claim 1, wherein, The predefined rule or the indication of the network device is used to indicate that the uplink beam of the repeated Msg3 is determined according to the uplink beam of the initial Msg3.

7. The method of claim 6, wherein, The determination of the uplink beam of the repeated Msg3 according to the uplink beam of the initial Msg3 includes: In the case that the initial Msg3 is not repeated transmission, or the initial Msg3 is repeated transmission and the uplink beams of the initial Msg3 are the same, the uplink beam of the repeated Msg3 is the same as the uplink beam of the initial Msg3. Or, In the case that the initial Msg3 is repeated transmission and the uplink beams of the initial Msg3 are at least partially different, the uplink beam of the repeated Msg3 is determined according to the determination manner of the uplink beam of the initial Msg3.

8. A Msg3 receiving method, applied to network equipment, characterized in that, Including: Determining the uplink beam of the initial Msg3 or the repeated Msg3 according to a predefined rule; And / or, indicating the uplink beam of the initial Msg3 or the repeated Msg3 to the terminal; Receiving the initial Msg3 or receiving the repeated Msg3; In the case that the uplink beam of the initial Msg3 or the repeated Msg3 is determined according to a predefined rule, the predefined rule includes one or more of the following: The uplink beam of the initial Msg3 or the repeated Msg3 is determined according to the SSB selected by the terminal when initiating random access; The uplink beam of the initial Msg3 or the repeated Msg3 is determined according to the PRACH sent by the terminal when initiating random access; Wherein, indicating the uplink beam of the initial Msg3 to the terminal includes: Indicating the uplink beam of the initial Msg3 to the terminal through one or more of the following: RAR information, DCI scheduling RAR, and system information; Wherein, the RAR information, the DCI scheduling RAR, or the system information is used to indicate any one of the following: the index of one or more reference SSBs, or the index of one or more reference PRACHs; Wherein, indicating the uplink beam of the repeated Msg3 to the terminal includes: Indicating the uplink beam of the repeated Msg3 to the terminal through DCI scrambled by TC-RNTI; Wherein, the DCI scrambled by the TC-RNTI is used to indicate any one of the following: The index of one or more reference SSBs; The index of one or more reference PRACHs; The index of one or more reference uplink beams of the initial Msg3.

9. The method of claim 8, wherein, The uplink beam of the initial Msg3 or the repeated Msg3 is determined according to the SSB selected by the terminal when initiating random access, including: In a case where the initial transmission Msg3 or the retransmission Msg3 is non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access; Or, In a case where the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beams of all the initial transmission or retransmission Msg3s of repeated transmission are the same; Or, In a case where the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of repeated transmission are determined according to one or more of the SSB selected when the terminal initiates random access and the SSB actually transmitted by the network device, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of repeated transmission are the same or at least partially different.

10. The method of claim 9, wherein, The uplink beams of the initial transmission Msg3 or the retransmission Msg3 of repeated transmission are determined according to the SSB selected when the terminal initiates random access and the SSB actually transmitted by the network device, including: determining the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 according to one or more of the SSB selected when the terminal initiates random access and the cyclic order of the SSB actually transmitted by the network device, and then determining the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of repeated transmission according to the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of repeated transmission; Or, determining the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of repeated transmission according to one or more of the SSB selected when the terminal initiates random access, the cyclic order of the SSB actually transmitted by the network device, and the relationship between the number of SSBs actually transmitted by the network device and the number of repetitions of the initial transmission Msg3 or the retransmission Msg3, and then determining the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of repeated transmission according to the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of repeated transmission.

11. The method of claim 8, wherein, The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the PRACH transmitted by the terminal when initiating random access, including: In a case where the PRACH is non-repeated transmission, or in a case where the PRACH is repeated transmission and the uplink beams of the PRACHs are the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH; Or, In a case where the PRACH is repeated transmission and the uplink beams of the PRACHs are at least partially different, and the initial transmission or retransmission Msg3 is non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the predefined PRACH; Or, In a case where the PRACH is repeated transmission, and uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are determined according to uplink beams of the PRACH of the repeated transmission, and uplink beams of each of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partially different.

12. The method of claim 11, wherein, The uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are determined according to the uplink beams of the PRACH of the repeated transmission, comprising: According to a cycle order of the uplink beams of the PRACH of the repeated transmission, determining the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then determining the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission according to the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission; Or, According to one or more of the cycle order of the uplink beams of the PRACH of the repeated transmission, and a relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3 or the retransmission Msg3, determining the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission, and then determining the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission according to the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission.

13. The method of claim 8, wherein, The determination of the uplink beams of the retransmission Msg3 according to the predefined rule comprises: Determining the uplink beams of the retransmission Msg3 according to the uplink beams of the initial transmission Msg3.

14. The method of claim 13, wherein, The determination of the uplink beams of the retransmission Msg3 according to the uplink beams of the initial transmission Msg3 comprises: In a case where the initial transmission Msg3 is non-repeated transmission, or the initial transmission Msg3 is repeated transmission and the uplink beams of the initial transmission Msg3 are the same, the uplink beams of the retransmission Msg3 are the same as the uplink beams of the initial transmission Msg3; Or, In a case where the initial transmission Msg3 is repeated transmission, and the uplink beams of the initial transmission Msg3 are at least partially different, the uplink beams of the retransmission Msg3 are determined according to a determination manner of the uplink beams of the initial transmission Msg3.

15. A Msg3 transmitting device, applied to a terminal, characterized in that, Comprising: A first processing module configured to determine uplink beams of an initial transmission Msg3 or a retransmission Msg3 according to a predefined rule and / or an indication of a network device; A first sending module configured to send the initial transmission Msg3 through the uplink beams of the initial transmission Msg3, or send the retransmission Msg3 through the uplink beams of the retransmission Msg3; In a case where the uplink beams of the initial transmission Msg3 or the retransmission Msg3 are determined according to the predefined rule, the predefined rule comprises one or more of the following: The uplink beams of the initial transmission Msg3 or the retransmission Msg3 are determined according to a synchronization signal block (SSB) selected by the terminal when initiating random access; The uplink beams of the initial transmission Msg3 or the retransmission Msg3 are determined according to a physical random access channel (PRACH) sent by the terminal when initiating random access; In a case where the uplink beam for the initial transmission Msg3 is determined according to the indication of the network device, the indication of the network device comprises one or more of the following: Random access response (RAR) information; Downlink control information (DCI) scheduling the RAR; A system message; The RAR information, the DCI scheduling the RAR, or the system message is used to indicate any of the following: Index of one or more reference SSBs; Index of one or more reference PRACHs; In a case where the uplink beam for the retransmission Msg3 is determined according to the indication of the network device, the indication of the network device comprises a cell radio network temporary identifier (TC-RNTI) scrambled DCI; The TC-RNTI scrambled DCI is used to indicate any of the following: Index of one or more reference SSBs; Index of one or more reference PRACHs; Index of one or more reference uplink beams for the initial transmission Msg3.

16. The apparatus of claim 15, wherein, The uplink beam for the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected by the terminal when initiating the random access, comprising: In a case where the initial transmission Msg3 or the retransmission Msg3 is non-repeated transmission, the uplink beam for the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected by the terminal when initiating the random access; Or, In a case where the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam for the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is determined according to the SSB selected by the terminal when initiating the random access, and the uplink beams for the initial transmission Msg3 or the retransmission Msg3 of all repeated transmissions are the same; Or, In a case where the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam for the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is determined according to one or more of the SSB selected by the terminal when initiating the random access and the SSB actually transmitted by the network device, and the uplink beams for the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partially different.

17. The apparatus of claim 16, wherein, The uplink beam for the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is determined according to one or more of the SSB selected by the terminal when initiating the random access and the SSB actually transmitted by the network device, comprising: According to one or more of the SSB selected by the terminal when initiating the random access and the cyclic order of the SSB actually transmitted by the network device, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3, and then determine the uplink beam for the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission according to the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission; Or, According to one or more of the SSB selected when the terminal initiates random access, the cyclic order of the SSB actually transmitted by the network device, and the relationship between the number of SSBs actually transmitted by the network device and the repetition number of the initial transmission Msg3 or retransmission Msg3, the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined, and then the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined according to the SSB corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3.

18. The apparatus of claim 15, wherein, The uplink beam of the initial transmission or retransmission Msg3 is determined according to the PRACH transmitted when the terminal initiates random access, including: In the case where the PRACH transmitted when the terminal initiates random access is non-repeated transmission, or in the case where the PRACH transmitted when the terminal initiates random access is repeated transmission and the uplink beams of the PRACHs are the same, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is the same as the uplink beam of the PRACH; Or, In the case where the PRACH transmitted when the terminal initiates random access is repeated transmission and the uplink beams of the PRACHs are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is non-repeated transmission, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is the same as the uplink beam of the predefined PRACH; Or, In the case where the PRACH transmitted when the terminal initiates random access is repeated transmission and the uplink beams of the PRACHs are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is repeated transmission, the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined according to the uplink beam of the repeatedly transmitted PRACH, and the uplink beams of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 are the same or at least partially different.

19. The apparatus of claim 18, wherein, The uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined according to the uplink beam of the repeatedly transmitted PRACH, including: According to one or more of the uplink beam of the first PRACH, the cyclic order of the uplink beams of the repeatedly transmitted PRACH, and the relationship between the number of PRACHs and the repetition number of the initial transmission Msg3 or retransmission Msg3, the PRACH corresponding to the initial transmission Msg3 or retransmission Msg3 is determined, and then the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined according to the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3. Or, According to one or more of the uplink beam of the first PRACH, the cyclic order of the uplink beams of the repeatedly transmitted PRACH, and the relationship between the number of PRACHs and the repetition number of the initial transmission Msg3 or retransmission Msg3, the PRACH corresponding to the initial transmission Msg3 or retransmission Msg3 is determined, and then the uplink beam of the repeatedly transmitted initial transmission Msg3 or retransmission Msg3 is determined according to the PRACH corresponding to the repeatedly transmitted initial transmission Msg3 or retransmission Msg3.

20. The apparatus of claim 15, wherein, The predefined rule or the indication of the network device is used to indicate that the uplink beam of the retransmission Msg3 is determined according to the uplink beam of the initial transmission Msg3.

21. The apparatus of claim 20, wherein, The determination of the uplink beam of the retransmission Msg3 according to the uplink beam of the initial transmission Msg3 comprises: In the case that the initial transmission Msg3 is non-repeated transmission, or the initial transmission Msg3 is repeated transmission and the uplink beams of the initial transmission Msg3 are the same, the uplink beam of the retransmission Msg3 is the same as the uplink beam of the initial transmission Msg3; Or, In the case that the initial transmission Msg3 is repeated transmission and the uplink beams of the initial transmission Msg3 are at least partially different, the uplink beam of the retransmission Msg3 is determined according to the determination mode of the uplink beam of the initial transmission Msg3.

22. A receiving device of a Msg3, applied to a network device, comprising: Comprise: The second processing module is used to determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3 according to the predefined rule; And / or, indicate the uplink beam of the initial transmission Msg3 or the retransmission Msg3 to the terminal; The first receiving module is used to receive the initial transmission Msg3 or the retransmission Msg3; In the case that the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the predefined rule, the predefined rule comprises one or more of the following: The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected by the terminal when initiating random access; The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the PRACH sent by the terminal when initiating random access; Wherein, indicating the uplink beam of the initial transmission Msg3 to the terminal comprises: Indicating the uplink beam of the initial transmission Msg3 to the terminal through one or more of the following: RAR information, DCI scheduling RAR, and system message; Wherein, the RAR information, the DCI scheduling RAR, or the system message is used to indicate any one of the following: the index of one or more reference SSBs, or the index of one or more reference PRACHs; Wherein, indicating the uplink beam of the retransmission Msg3 to the terminal comprises: Indicating the uplink beam of the retransmission Msg3 to the terminal through DCI scrambled by TC-RNTI; Wherein, the DCI scrambled by the TC-RNTI is used to indicate any one of the following: The index of one or more reference SSBs; The index of one or more reference PRACHs; The index of one or more reference uplink beams of the initial transmission Msg3.

23. The apparatus of claim 22, wherein, The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected by the terminal when initiating random access, comprising: In the case that the initial transmission Msg3 or the retransmission Msg3 is non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected by the terminal when initiating random access; Or, In the case that the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected by the terminal when initiating random access, and all the uplink beams of the initial transmission or the retransmission Msg3 of the repeated transmission are the same; Or, In a case where the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beams of the initial transmission Msg3 or the retransmission Msg3 in repeated transmission are determined according to one or more of the SSB selected when the terminal initiates random access and the SSB actually transmitted by the network device, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 in repeated transmission are all the same or at least partially different.

24. The apparatus of claim 23, wherein, The uplink beams of the initial transmission Msg3 or the retransmission Msg3 in repeated transmission are determined according to the SSB selected when the terminal initiates random access and the SSB actually transmitted by the network device, comprising: determining the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 according to one or more of the SSB selected when the terminal initiates random access and the cyclic order of the SSB actually transmitted by the network device, and then determining the uplink beams of the initial transmission Msg3 or the retransmission Msg3 in repeated transmission according to the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 in repeated transmission; or, determining the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 in repeated transmission according to one or more of the SSB selected when the terminal initiates random access, the cyclic order of the SSB actually transmitted by the network device, and the relationship between the number of SSBs actually transmitted by the network device and the number of repetitions of the initial transmission Msg3 or the retransmission Msg3, and then determining the uplink beams of the initial transmission Msg3 or the retransmission Msg3 in repeated transmission according to the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 in repeated transmission.

25. The apparatus of claim 22, wherein, The uplink beams of the initial transmission Msg3 or the retransmission Msg3 are determined according to the PRACH transmitted when the terminal initiates random access, comprising: In a case where the PRACH is non-repeated transmission, or in a case where the PRACH is repeated transmission and the uplink beams of each PRACH are the same, the uplink beams of the initial transmission Msg3 or the retransmission Msg3 are the same as the uplink beams of the PRACH; or, In a case where the PRACH is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission or the retransmission Msg3 is non-repeated transmission, the uplink beams of the initial transmission Msg3 or the retransmission Msg3 are the same as the predefined uplink beams of the PRACH; or, In a case where the PRACH is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beams of the initial transmission Msg3 or the retransmission Msg3 in repeated transmission are determined according to the uplink beams of the PRACH in repeated transmission, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 in each repeated transmission are all the same or at least partially different.

26. The apparatus of claim 25, wherein, The uplink beams of the initial transmission Msg3 or the retransmission Msg3 in repeated transmission are determined according to the uplink beams of the PRACH in repeated transmission, comprising: According to the cyclic order of the uplink beams of the repeated PRACHs, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3. Or, According to one or more of the cyclic order of the uplink beams of the repeated PRACHs, and the relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3 or the retransmission Msg3, determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the initial transmission Msg3 or the retransmission Msg3.

27. A communications device, comprising: Comprise: A processor, a memory, and a program stored on the memory and executable on the processor, the program being executed by the processor to implement the steps of the method of any one of claims 1 to 14.

28. A readable storage medium, characterized by, The program or instructions stored on the readable storage medium are executed by the processor to implement the steps of the method of any one of claims 1 to 14.

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