Msg3 Sending Method, Receiving Method, Device, and Storage Medium

Abstract

Embodiments of the present application provide a Msg3 sending method, receiving method, device, and storage medium. Among them, the Msg3 sending includes: receiving DCI sent by a network-side device for scheduling Msg3 retransmission; when determining that the number of bits used to indicate MCS in the DCI is less than 5 bits, determining the MCS for Msg3 retransmission through the bits used to indicate MCS in the DCI; and / or determining the MCS for Msg3 retransmission through a predefined method; sending a Msg3 retransmission according to the determined MCS for Msg3 retransmission. The Msg3 sending method, receiving method, device, and storage medium provided by the embodiments of the present application enable a terminal to determine the modulation order and / or coding rate corresponding to the MCS used for Msg3 retransmission through explicit indication and / or predefined methods, ensuring that the MCS used for Msg3 retransmission can meet the TBS requirements for retransmission and improving the reliability of uplink access.

Description

Technical Field

[0001] The present application relates to the field of communication technologies, and in particular, to a method and device for sending and receiving Message 3 (Msg3), and a storage medium. Background Art

[0002] In the prior art, 2 bits are separated from the Modulation and Coding Scheme (MCS) indication field (referred to as the "MCS field" for short) in the Downlink Control Information (DCI) for scheduling Msg3 retransmission to indicate the number of repeat transmissions during Msg3 retransmission. At this time, only 3 bits are available in the MCS field of the scheduling DCI. The MCS indexes specifically for retransmission in the existing MCS index table are 28 - 31, and the 3-bit MCS field cannot correspond to the indication, resulting in the possibility that the MCS that meets the retransmission requirements cannot be selected during Msg3 retransmission. Therefore, a new scheme for indicating the MCS used during Msg3 retransmission needs to be designed. Summary of the Invention

[0003] Embodiments of the present application provide a method and device for sending and receiving Msg3, and a storage medium, to solve the technical problem that the MCS that meets the retransmission requirements cannot be selected during Msg3 retransmission in the prior art.

[0004] In a first aspect, an embodiment of the present application provides a method for sending Msg3, including:

[0005] Receiving DCI sent by a network-side device for scheduling Msg3 retransmission;

[0006] When it is determined that the number of bits used to indicate the MCS in the DCI is less than 5 bits, determining the MCS for Msg3 retransmission through the bits used to indicate the MCS in the DCI; and / or determining the MCS for Msg3 retransmission through a predefined manner;

[0007] Sending Msg3 retransmission according to the determined MCS for Msg3 retransmission.

[0008] In some embodiments, determining the MCS for Msg3 retransmission through the bits used to indicate the MCS in the DCI includes:

[0009] Updating the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit value indicated by the MCS indication field; the bits used to indicate the MCS in the DCI are the low 3 bits in the MCS indication field of the DCI;

[0010] Determine the first MCS index according to the new 5-bit determined by the MCS indication field;

[0011] Determine the MCS during Msg3 retransmission according to the first MCS index and the first MCS index table.

[0012] In some embodiments, determining the MCS during Msg3 retransmission by the bits for indicating MCS in the DCI includes:

[0013] Determine the X-bit for indicating MCS in the DCI;

[0014] Use the X-bit as the low-order bits, and use the bits with 5-X bits all being 1 as the high-order bits to generate new 5-bit;

[0015] Determine the first MCS index according to the new 5-bit;

[0016] Determine the MCS during Msg3 retransmission according to the first MCS index and the first MCS index table.

[0017] In some embodiments, determining the MCS during Msg3 retransmission by the bits for indicating MCS in the DCI includes:

[0018] Determine the X-bit for indicating MCS in the DCI;

[0019] Determine the second MCS index according to the X-bit, and the offset of the MCS index;

[0020] Determine the first MCS index according to the second MCS index and the offset;

[0021] Determine the MCS during Msg3 retransmission according to the first MCS index and the first MCS index table.

[0022] In some embodiments, the offset is (32 - 2^X).

[0023] In some embodiments, determining the MCS during Msg3 retransmission by the bits for indicating MCS in the DCI includes:

[0024] Determine the X-bit for indicating MCS in the DCI;

[0025] Determine the first MCS index according to the X-bit;

[0026] Determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of the initial transmission of Msg3, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit.

[0027] In some embodiments, the X-bit is the high-order X-bit or the low-order X-bit in the MCS indication field in the DCI.

[0028] In some embodiments, the value of X is 2 or 3.

[0029] In some embodiments, determining the MCS for Msg3 retransmission by the bits for indicating MCS in the DCI includes:

[0030] Determine the X-bit for indicating MCS in the DCI;

[0031] Determine the first MCS index according to the X-bit;

[0032] Determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table. The third MCS index table contains the MCS elements in the MCS index table adopted during the initial transmission of Msg3 and the MCS elements in the second MCS index table. The MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of the initial transmission of Msg3.

[0033] In some embodiments, determining the MCS for Msg3 retransmission by the bits for indicating MCS in the DCI includes:

[0034] Determine the highest bit or the lowest bit of the X-bit for indicating MCS in the DCI;

[0035] Determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X - 1 bits of the X-bit except the highest bit or the lowest bit. The fourth MCS index table is the same as the MCS index table adopted during the initial transmission of Msg3 or the second MCS index table. When the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table adopted during the initial transmission of Msg3. When the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of the initial transmission of Msg3;

[0036] Determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0037] In some embodiments, determining the MCS for Msg3 retransmission through the bits in the DCI for indicating the MCS includes:

[0038] Determine the X - bit in the DCI for indicating the MCS;

[0039] Determine the first MCS index according to the X - bit;

[0040] Determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table. The fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table. The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X - bit. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission. The part of the MCS elements in the first MCS index table that constitutes the fifth MCS index table is associated with the MCS used in Msg3 initial transmission.

[0041] In some embodiments, the X - bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

[0042] In some embodiments, determining the MCS for Msg3 retransmission through a predefined method includes:

[0043] Determine that the modulation order of the MCS for Msg3 retransmission is a preset value M.

[0044] In some embodiments, the value of M is 2.

[0045] In some embodiments, determining the MCS for Msg3 retransmission through a predefined method includes:

[0046] Determine that the modulation order of the MCS for Msg3 retransmission is the modulation order of the MCS used in Msg3 initial transmission.

[0047] In some embodiments, determining the MCS for Msg3 retransmission through the bits in the DCI for indicating the MCS and a predefined method includes:

[0048] Determine that the candidate MCS used in Msg3 initial transmission is the default value, or determine that the modulation orders of the candidate MCSs used in Msg3 initial transmission do not exceed P;

[0049] Determine that the modulation order corresponding to the MCS during Msg3 retransmission is N in a predefined manner.

[0050] In some embodiments, the value of N is q or 2.

[0051] In some embodiments, determining the MCS during Msg3 retransmission by the bits in the DCI for indicating the MCS and a predefined manner includes:

[0052] Determine that the candidate MCS used during the initial transmission of Msg3 is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used during the initial transmission of Msg3 exceeds P;

[0053] Determine the MCS during Msg3 retransmission by the bits in the DCI for indicating the MCS.

[0054] In some embodiments, the value of P is 2.

[0055] In a second aspect, an embodiment of the present application provides a method for receiving Msg3, including:

[0056] Send DCI for scheduling Msg3 retransmission to the terminal;

[0057] Receive the Msg3 retransmission sent by the terminal, where the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by the bits in the DCI for indicating the MCS, and the number of bits for indicating the MCS is less than 5; and / or, the MCS of the Msg3 retransmission is predefined.

[0058] In some embodiments, indicating the MCS during Msg3 retransmission by the bits in the DCI for indicating the MCS includes:

[0059] Update the high 2 bits of the MCS indication field in the DCI to 1 to obtain new 5-bit bits indicated by the MCS indication field; the bits in the DCI for indicating the MCS are the low 3 bits in the MCS indication field of the DCI;

[0060] Determine the first MCS index according to the new 5-bit bits indicated by the MCS indication field;

[0061] Determine the MCS during Msg3 retransmission according to the first MCS index and the first MCS index table.

[0062] In some embodiments, indicating the MCS during Msg3 retransmission by the bits in the DCI for indicating the MCS includes:

[0063] Determine the X-bit bits in the DCI for indicating the MCS;

[0064] Using the X-bit as the lower-order bits and the bits with a 5-X-bit value of all 1s as the higher-order bits, generate a new 5-bit value;

[0065] Determine a first MCS index according to the new 5-bit value;

[0066] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0067] In some embodiments, indicating the MCS for Msg3 retransmission by the bits in the DCI for indicating MCS includes:

[0068] Determine the X-bit in the DCI for indicating MCS;

[0069] Determine a second MCS index and an offset of the MCS index according to the X-bit;

[0070] Determine the first MCS index according to the second MCS index and the offset;

[0071] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0072] In some embodiments, the offset is (32 - 2^X).

[0073] In some embodiments, indicating the MCS for Msg3 retransmission by the bits in the DCI for indicating MCS includes:

[0074] Determine the X-bit in the DCI for indicating MCS;

[0075] Determine the first MCS index according to the X-bit;

[0076] Determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table, where each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit.

[0077] In some embodiments, the X-bit is the higher-order X-bit or the lower-order X-bit in the MCS indication field in the DCI.

[0078] In some embodiments, the value of X is 2 or 3.

[0079] In some embodiments, indicating the MCS for Msg3 retransmission by the bits in the DCI for indicating MCS includes:

[0080] Determine the X-bit in the DCI for indicating the MCS;

[0081] Determine the first MCS index according to the X-bit;

[0082] Determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table, where the third MCS index table includes the MCS elements in the MCS index table used for the initial transmission of Msg3 and the MCS elements in the second MCS index table. The MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission.

[0083] In some embodiments, indicating the MCS for Msg3 retransmission by the bit for indicating the MCS in the DCI includes:

[0084] Determine the highest bit or the lowest bit of the X-bit in the DCI for indicating the MCS;

[0085] Determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X - 1 bits of the X-bit except the highest bit or the lowest bit. The fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3 or the second MCS index table. When the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3. When the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission;

[0086] Determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0087] In some embodiments, indicating the MCS for Msg3 retransmission by the bit for indicating the MCS in the DCI includes:

[0088] Determine the X-bit in the DCI for indicating the MCS;

[0089] Determine the first MCS index according to the X-bit;

[0090] Determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table, where the fifth MCS index table is formed by combining partial MCS elements in the first MCS index table and partial or all MCS elements in the second MCS index table. The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the same as the TBS of Msg3 initial transmission. The partial MCS elements in the first MCS index table that make up the fifth MCS index table are associated with the MCS used for Msg3 initial transmission.

[0091] In some embodiments, the X-bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

[0092] In some embodiments, predefining the MCS for Msg3 retransmission includes:

[0093] Determine that the modulation order of the MCS for Msg3 retransmission is a preset value M.

[0094] In some embodiments, the value of M is 2.

[0095] In some embodiments, predefining the MCS for Msg3 retransmission includes:

[0096] Determine that the modulation order of the MCS for Msg3 retransmission is the modulation order of the MCS used for Msg3 initial transmission.

[0097] In some embodiments, indicating the MCS for Msg3 retransmission through the bits in the DCI for indicating MCS and a predefined method includes:

[0098] Determine that the candidate MCS used for Msg3 initial transmission is the default value, or determine that the modulation orders of the candidate MCSs used for Msg3 initial transmission do not exceed P;

[0099] Determine the modulation order corresponding to the MCS for Msg3 retransmission as N through a predefined method.

[0100] In some embodiments, the value of N is q or 2.

[0101] In some embodiments, indicating the MCS for Msg3 retransmission through the bits in the DCI for indicating MCS and a predefined method includes:

[0102] Determine that the candidate MCS used for Msg3 initial transmission is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used for Msg3 initial transmission exceeds P;

[0103] The MCS for Msg3 retransmission is indicated by the bit used to indicate the MCS in the DCI.

[0104] In some embodiments, the value of P is 2.

[0105] In a third aspect, an embodiment of the present application provides a terminal, including a memory, a transceiver, and a processor;

[0106] The memory is used to store a computer program; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer program in the memory and perform the following operations:

[0107] Receive DCI sent by a network-side device for scheduling Msg3 retransmission;

[0108] When it is determined that the number of bits of the bit used to indicate the MCS in the DCI is less than 5 bits, determine the MCS for Msg3 retransmission through the bit used to indicate the MCS in the DCI; and / or, determine the MCS for Msg3 retransmission through a predefined method;

[0109] Send Msg3 retransmission according to the determined MCS for Msg3 retransmission.

[0110] In some embodiments, determining the MCS for Msg3 retransmission through the bit used to indicate the MCS in the DCI includes:

[0111] Update the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit bit indicated by the MCS indication field; the bit used to indicate the MCS in the DCI is the low 3-bit bits in the MCS indication field of the DCI;

[0112] Determine a first MCS index according to the new 5-bit bit indicated by the MCS indication field;

[0113] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0114] In some embodiments, determining the MCS for Msg3 retransmission through the bit used to indicate the MCS in the DCI includes:

[0115] Determine the X-bit bits used to indicate the MCS in the DCI;

[0116] Use the X-bit bits as the low-order bits, and use bits with 5-X-bit values all being 1 as the high-order bits to generate a new 5-bit bit;

[0117] Determine a first MCS index according to the new 5-bit bit;

[0118] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0119] In some embodiments, determining the MCS for Msg3 retransmission by the bits in the DCI for indicating the MCS includes:

[0120] Determine the X-bit in the DCI for indicating the MCS;

[0121] Determine the second MCS index and the offset of the MCS index according to the X-bit;

[0122] Determine the first MCS index according to the second MCS index and the offset;

[0123] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0124] In some embodiments, the offset is (32 - 2^X).

[0125] In some embodiments, determining the MCS for Msg3 retransmission by the bits in the DCI for indicating the MCS includes:

[0126] Determine the X-bit in the DCI for indicating the MCS;

[0127] Determine the first MCS index according to the X-bit;

[0128] Determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table, where each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit.

[0129] In some embodiments, the X-bit is the high X-bit or the low X-bit in the MCS indication field in the DCI.

[0130] In some embodiments, the value of X is 2 or 3.

[0131] In some embodiments, determining the MCS for Msg3 retransmission by the bits in the DCI for indicating the MCS includes:

[0132] Determine the X-bit in the DCI for indicating the MCS;

[0133] Determine the first MCS index according to the X-bit;

[0134] Determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table. The third MCS index table includes the MCS elements in the MCS index table used for the initial transmission of Msg3 and the MCS elements in the second MCS index table. The MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3.

[0135] In some embodiments, determining the MCS for Msg3 retransmission through the bits used to indicate the MCS in the DCI includes:

[0136] Determine the highest bit or the lowest bit of the X-bit used to indicate the MCS in the DCI;

[0137] Determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X - 1 bits of the X-bit except the highest bit or the lowest bit. The fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3 or the second MCS index table. When the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3. When the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3;

[0138] Determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0139] In some embodiments, determining the MCS for Msg3 retransmission through the bits used to indicate the MCS in the DCI includes:

[0140] Determine the X-bit used to indicate the MCS in the DCI;

[0141] Determine the first MCS index according to the X-bit;

[0142] Determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table, where the fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table. The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; some MCS elements in the first MCS index table that make up the fifth MCS index table are associated with the MCS used for Msg3 initial transmission.

[0143] In some embodiments, the X-bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

[0144] In some embodiments, determine the MCS for Msg3 retransmission by a predefined method, including:

[0145] Determine that the modulation order of the MCS for Msg3 retransmission is a preset value M.

[0146] In some embodiments, the value of M is 2.

[0147] In some embodiments, determine the MCS for Msg3 retransmission by a predefined method, including:

[0148] Determine that the modulation order of the MCS for Msg3 retransmission is the modulation order of the MCS used for Msg3 initial transmission.

[0149] In some embodiments, determine the MCS for Msg3 retransmission by the bits in the DCI for indicating MCS and a predefined method, including:

[0150] Determine that the candidate MCS used for Msg3 initial transmission is the default value, or determine that the modulation orders of the candidate MCSs used for Msg3 initial transmission do not exceed P;

[0151] Determine the modulation order corresponding to the MCS for Msg3 retransmission by a predefined method as N.

[0152] In some embodiments, the value of N is q or 2.

[0153] In some embodiments, determine the MCS for Msg3 retransmission by the bits in the DCI for indicating MCS and a predefined method, including:

[0154] Determine that the candidate MCS used for Msg3 initial transmission is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used for Msg3 initial transmission exceeds P;

[0155] Determine the MCS for Msg3 retransmission based on the bits used to indicate the MCS in the DCI.

[0156] In some embodiments, the value of P is 2.

[0157] In a fourth aspect, an embodiment of the present application provides a network-side device, including a memory, a transceiver, and a processor;

[0158] The memory is used to store computer programs; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations:

[0159] Send DCI for scheduling Msg3 retransmission to the terminal;

[0160] Receive the Msg3 retransmission sent by the terminal, where the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by the bits used to indicate the MCS in the DCI, and the number of bits used to indicate the MCS is less than 5; and / or, the MCS of the Msg3 retransmission is predefined.

[0161] In some embodiments, indicating the MCS for Msg3 retransmission by the bits used to indicate the MCS in the DCI includes:

[0162] Update the high 2 bits of the MCS indication field in the DCI to 1 to obtain new 5-bit bits indicated by the MCS indication field; the bits used to indicate the MCS in the DCI are the low 3 bits in the MCS indication field of the DCI;

[0163] Determine a first MCS index according to the new 5-bit bits indicated by the MCS indication field;

[0164] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0165] In some embodiments, indicating the MCS for Msg3 retransmission by the bits used to indicate the MCS in the DCI includes:

[0166] Determine the X-bit bits used to indicate the MCS in the DCI;

[0167] Use the X-bit bits as the low-order bits and bits with 5-X bits all being 1 as the high-order bits to generate new 5-bit bits;

[0168] Determine a first MCS index according to the new 5-bit bits;

[0169] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0170] In some embodiments, the MCS for Msg3 retransmission is indicated by the bits in the DCI for indicating MCS, including:

[0171] Determine the X-bit in the DCI for indicating MCS;

[0172] Determine a second MCS index and an offset of the MCS index according to the X-bit;

[0173] Determine a first MCS index according to the second MCS index and the offset;

[0174] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0175] In some embodiments, the offset is (32 - 2^X).

[0176] In some embodiments, the MCS for Msg3 retransmission is indicated by the bits in the DCI for indicating MCS, including:

[0177] Determine the X-bit in the DCI for indicating MCS;

[0178] Determine a first MCS index according to the X-bit;

[0179] Determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table, where each row in the second MCS index table only includes modulation orders, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit.

[0180] In some embodiments, the X-bit is the high X-bit or the low X-bit in the MCS indication field in the DCI.

[0181] In some embodiments, the value of X is 2 or 3.

[0182] In some embodiments, the MCS for Msg3 retransmission is indicated by the bits in the DCI for indicating MCS, including:

[0183] Determine the X-bit in the DCI for indicating MCS;

[0184] Determine a first MCS index according to the X-bit;

[0185] Determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table, where the third MCS index table includes the MCS elements in the MCS index table used for the initial transmission of Msg3 and the MCS elements in the second MCS index table. The MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3.

[0186] In some embodiments, indicating the MCS for Msg3 retransmission by the bits for indicating the MCS in the DCI includes:

[0187] Determine the highest bit or the lowest bit of the X-bit for indicating the MCS in the DCI;

[0188] Determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X - 1 bits of the X-bit except the highest bit or the lowest bit. The fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3 or the second MCS index table. When the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3. When the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3.

[0189] Determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0190] In some embodiments, indicating the MCS for Msg3 retransmission by the bits for indicating the MCS in the DCI includes:

[0191] Determine the X-bit for indicating the MCS in the DCI;

[0192] Determine the first MCS index according to the X-bit;

[0193] Determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table, where the fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all of the MCS elements in the second MCS index table. The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the same as the TBS for the initial transmission of Msg3. The part of the MCS elements in the first MCS index table that constitutes the fifth MCS index table is associated with the MCS used for the initial transmission of Msg3.

[0194] In some embodiments, the X-bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

[0195] In some embodiments, predefining the MCS for Msg3 retransmission includes:

[0196] Determine that the modulation order of the MCS for Msg3 retransmission is a preset value M.

[0197] In some embodiments, the value of M is 2.

[0198] In some embodiments, predefining the MCS for Msg3 retransmission includes:

[0199] Determine that the modulation order of the MCS for Msg3 retransmission is the modulation order of the MCS used for the initial transmission of Msg3.

[0200] In some embodiments, indicating the MCS for Msg3 retransmission through the bits for indicating MCS in the DCI and a predefined method includes:

[0201] Determine that the candidate MCS used for the initial transmission of Msg3 is the default value, or determine that the modulation orders of all the candidate MCSs used for the initial transmission of Msg3 do not exceed P;

[0202] Determine the modulation order corresponding to the MCS for Msg3 retransmission as N through a predefined method.

[0203] In some embodiments, the value of N is q or 2.

[0204] In some embodiments, indicating the MCS for Msg3 retransmission through the bits for indicating MCS in the DCI and a predefined method includes:

[0205] Determine that the candidate MCS used for the initial transmission of Msg3 is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used for the initial transmission of Msg3 exceeds P;

[0206] The MCS during Msg3 retransmission is indicated by the bit for indicating MCS in the DCI.

[0207] In some embodiments, the value of P is 2.

[0208] In a fifth aspect, an embodiment of the present application provides a Msg3 sending device, including:

[0209] A first receiving module, configured to receive DCI for scheduling Msg3 retransmission sent by a network-side device;

[0210] A first determining module, configured to determine the MCS during Msg3 retransmission by the bit for indicating MCS in the DCI when it is determined that the number of bits of the bit for indicating MCS in the DCI is less than 5 bits; and / or determine the MCS during Msg3 retransmission by a predefined method;

[0211] A first sending module, configured to send Msg3 retransmission according to the determined MCS during Msg3 retransmission.

[0212] In a sixth aspect, an embodiment of the present application provides a Msg3 receiving device, including:

[0213] A second sending module, configured to send DCI for scheduling Msg3 retransmission to a terminal;

[0214] A second receiving module, configured to receive the Msg3 retransmission sent by the terminal, where the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by the bit for indicating MCS in the DCI, and the number of bits of the bit for indicating MCS is less than 5; and / or the MCS of the Msg3 retransmission is predefined.

[0215] In a seventh aspect, an embodiment of the present application further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, and the computer program is used to enable a processor to execute the steps of the Msg3 sending method described in the first aspect above or the steps of the Msg3 receiving method described in the second aspect above.

[0216] In an eighth aspect, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and the computer program is used to enable a computer to execute the steps of the Msg3 sending method described in the first aspect above or the steps of the Msg3 receiving method described in the second aspect above.

[0217] In a ninth aspect, an embodiment of the present application further provides a readable storage medium for a communication device. The readable storage medium for the communication device stores a computer program, and the computer program is used to cause the communication device to execute the steps of the Msg3 sending method described in the first aspect above or the steps of the Msg3 receiving method described in the second aspect above.

[0218] In a tenth aspect, an embodiment of the present application further provides a readable storage medium for a chip product. The readable storage medium for the chip product stores a computer program, and the computer program is used to cause the chip product to execute the steps of the Msg3 sending method described in the first aspect above or the steps of the Msg3 receiving method described in the second aspect above.

[0219] The Msg3 sending method, receiving method, device, and storage medium provided by the embodiments of the present application enable the terminal to determine the modulation order and / or coding rate corresponding to the MCS used for Msg3 retransmission through explicit indication and / or predefined methods, ensuring that the MCS used for Msg3 retransmission can meet the TBS requirements for retransmission and improving the reliability of uplink access. BRIEF DESCRIPTION OF THE DRAWINGS

[0220] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0221] Figure 1 is a schematic flowchart of the Msg3 sending method provided by an embodiment of the present application;

[0222] Figure 2 is a schematic flowchart of the Msg3 receiving method provided by an embodiment of the present application;

[0223] Figure 3 is a schematic structural diagram of a terminal provided by an embodiment of the present application;

[0224] Figure 4 is a schematic structural diagram of a network-side device provided by an embodiment of the present application;

[0225] Figure 5 is a schematic structural diagram of a Msg3 sending device provided by an embodiment of the present application;

[0226] Figure 6 is a schematic structural diagram of a Msg3 receiving device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0227] In the New Radio (NR) system, when the gNB schedules the Physical Uplink Shared Channel (PUSCH) using Downlink Control Information (DCI), the modulation order Q used for PUSCH transmission is indicated by the Modulation and Coding Scheme (MCS) field in the DCI. m And the coding rate r. The User Equipment (UE) calculates the Transport Block Size (TBS) for PUSCH transmission based on the time-frequency resources allocated by the DCI, the modulation order Q m And the coding rate r. During the uplink access process, Msg3 is scheduled by the UL grant in the Random Access Response (RAR). The information fields contained in this UL grant are shown in Table 1.

[0228] Table 1 Information fields contained in the UL grant

[0229]

[0230] In Release 15 / 16, Msg3 does not support retransmission. At this time, the 4-bit MCS field in this UL grant is all used to indicate the modulation order and / or coding rate of Msg3. During the study of Release 17, the RAN1#107e meeting decided that when the UE initiates the initial access with retransmission of the first transmission of Msg3, 2 bits of the 4-bit MCS field are used to indicate the number of repetitions, and the specific method is as follows:

[0231] (1) Repetition number indication: The 4 states of 2 bits of the original 4-bit MCS field correspond to the 4 repetition numbers configured in the System Information Block (SIB) 1. If not configured, the default is {1, 2, 3, 4};

[0232] (2) MCS indication: The 4 states of the remaining 2 bits of the original MCS correspond to the 4 MCS rows configured in the SIB1. If not configured, the default is MCS 0, 1, 2, 3.

[0233] For the case of Msg3 retransmission, the UE is scheduled by DCI 0_0 scrambled with the Temporary Cell Radio Network Temporary Identity (TC-RNTI). At this time, there is a 5-bit MCS field in the DCI.

[0234] However, the current RAN1 #107e meeting only stipulates the number of repetitions when the gNB uses a method similar to the initial transmission to indicate retransmission, but there is no conclusion on how to determine the MCS at this time:

[0235] (1) Repetition number indication: Similar to the initial transmission, 4 states of 2 bits in the original 5-bit MCS field indicate the number of repetitions;

[0236] (2) MCS indication: Only the remaining 3 bits of the MCS can be used, and the specific indication method has not been determined.

[0237] Table 2 is the MCS index table of PUSCH with transform precoding and 64QAM. As shown in Table 2, the 5-bit MCS can indicate any row in index 0 - 31. The prior art stipulates that the TBS of Msg3 retransmission needs to be the same as that of the initial transmission Msg3. This can be achieved through two ways:

[0238] (1) Use the MCS in MCS 0 - MCS 27 that can obtain the same TBS as the initial transmission;

[0239] (2) Use a modulation order Q in MCS 28 - MCS 31 m , and the UE calculates the coding rate r according to the initial transmission TBS and the modulation order Q m , and then completes the retransmission of Msg3. The modulation orders q, 2, 4, 6 indicated by 28 ≤ I MCS ≤ 31 correspond to pi / 2BPSK, QPSK, 16QAM, and 64QAM respectively, where I MCS represents the MCS index.

[0240] Table 2 MCS index table of PUSCH with transform precoding and 64QAM

[0241]

[0242]

[0243] The prior art divides 2 bits in the MCS field of the DCI scheduling Msg3 retransmission to indicate the number of repeated transmissions during Msg3 retransmission. At this time, only 3 bits of the MCS field in the scheduling DCI are available, and the MCS indexes specifically for retransmission in the MCS index table in the existing protocol are 28 - 31, and the 3-bit MCS field cannot correspond to the indication, resulting in the possibility that Msg3 retransmission may not be able to select an MCS that meets the retransmission requirements. Therefore, a new scheme for indicating the MCS used during Msg3 retransmission needs to be designed.

[0244] Based on the above technical problems, the embodiments of the present application provide a Msg3 sending method, a receiving method, a device, and a storage medium. When the MCS indication field in the DCI for scheduling Msg3 retransmission has less than 5 bits, through explicit indication and / or predefined methods, the UE can determine the modulation order and / or coding rate corresponding to the MCS used for Msg3 retransmission, ensuring that the MCS used for Msg3 retransmission can meet the TBS requirements of retransmission and improving the reliability of uplink access.

[0245] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part rather than all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0246] Figure 1 is a flowchart of the Msg3 sending method provided by the embodiments of the present application. As Figure 1 shown, the embodiments of the present application provide a Msg3 sending method, and its execution subject may be a UE, such as a mobile phone, etc. The method includes:

[0247] Step 101: Receive the DCI for scheduling Msg3 retransmission sent by the network side device.

[0248] Specifically, the network side device in the embodiments of the present application may be an access network network element, such as a base station, etc., or a core network network element, such as an Access and Mobility Management Function (AMF) network element, etc.

[0249] When the network side device schedules Msg3 retransmission, it may explicitly indicate to the UE the MCS used for Msg3 retransmission in the MCS field of the DCI, that is, the indication information of the network side device MCS is carried in the MCS field of the DCI, and the DCI for scheduling Msg3 retransmission is sent to the UE. Among them, the number of bits used to indicate the MCS is less than 5.

[0250] The UE receives the DCI for scheduling Msg3 retransmission sent by the network side device.

[0251] Step 102: In the case of determining that the number of bits used to indicate the MCS in the DCI is less than 5 bits, determine the MCS for Msg3 retransmission through the bits used to indicate the MCS in the DCI; and / or determine the MCS for Msg3 retransmission through a predefined method.

[0252] Specifically, after receiving the DCI, the UE determines whether the number of bits used to indicate the MCS in the DCI is less than 5.

[0253] If the number of bits used to indicate the MCS in the DCI is equal to 5, the UE can determine the MCS for Msg3 retransmission according to the bit value indicating the MCS in the DCI by using a traditional (legacy) MCS index table (such as Table 2).

[0254] If the number of bits used to indicate the MCS in the DCI is insufficient (less than) 5, the UE needs to determine the MCS for Msg3 retransmission through the bits used to indicate the MCS in the DCI. The embodiments of the present application provide various solutions. Please refer to the specific descriptions in the following embodiments.

[0255] In addition, after receiving the DCI, the UE can also determine the MCS for Msg3 retransmission according to a predefined manner. For example, the MCS for Msg3 retransmission can be a fixed value. The embodiments of the present application provide various solutions. Please refer to the specific descriptions in the following embodiments.

[0256] Furthermore, after receiving the DCI, the UE can also determine the MCS for Msg3 retransmission by combining the bits used to indicate the MCS in the DCI and the predefined manner. The embodiments of the present application also provide various solutions. Please refer to the specific descriptions in the following embodiments.

[0257] Step 103: Send a Msg3 retransmission according to the determined MCS for Msg3 retransmission.

[0258] Specifically, after determining the MCS for Msg3 retransmission, the UE sends a Msg3 retransmission according to the determined MCS for Msg3 retransmission, that is, sends a Msg3 retransmission according to the modulation order and / or coding rate corresponding to the MCS.

[0259] The network side device receives the Msg3 retransmission sent by the UE and demodulates the Msg3 retransmission according to the modulation order of the MCS indicating the UE for Msg3 retransmission and / or according to the modulation order of the MCS for Msg3 retransmission determined by a predefined manner.

[0260] The Msg3 sending method provided by the embodiments of the present application enables the UE to determine the modulation order and / or coding rate corresponding to the MCS adopted for Msg3 retransmission through explicit indication and / or predefined manner, ensuring that the MCS used for Msg3 retransmission can meet the TBS requirements for retransmission and improving the reliability of uplink access.

[0261] In some embodiments, determining the MCS for Msg3 retransmission through the bits used to indicate the MCS in the DCI includes:

[0262] Update the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit value indicated by the MCS indication field; the bits used to indicate the MCS in the DCI are the low 3 bits in the MCS indication field of the DCI.

[0263] Determine a first MCS index according to the new 5-bit value indicated by the MCS indication field.

[0264] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0265] Specifically, in the embodiments of the present application, the MCS adopted by the UE in the MCS index table is determined by the 3 bits indicating the MCS.

[0266] The MCS index table in the embodiments of the present application adopts a legacy MCS index table (such as Table 2).

[0267] When determining the MCS index, it is determined by interpreting the bits other than the 3 bits used to indicate the MCS in the original 5-bit MCS as 1. The specific steps are as follows:

[0268] The UE updates the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit value indicated by the MCS indication field; the bits used to indicate the MCS in the DCI are the low 3 bits in the MCS indication field of the DCI.

[0269] The UE determines a first MCS index according to the new 5-bit value indicated by the MCS indication field.

[0270] The UE determines the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table (legacy MCS index table).

[0271] For example, reuse the mechanism during existing retransmission, that is, as much as possible, the bits used to indicate the MCS are indicated to the range where the MCS index in the legacy MCS index table is 28 ≤ I MCS ≤ 31. The high 2 bits in the original 5-bit MCS field are used to indicate the number of repeated transmissions during Msg3 retransmission, and the low 3 bits are still used to indicate the MCS. Assume that during UE Msg3 retransmission, the 5-bit MCS is '10100'. When the UE determines the number of repeated transmissions of Msg3 retransmission, read the 2-bit MSB '10' corresponding to 4 times of repeated transmission times; when the UE determines the MCS of Msg3 retransmission, update / interpret the 2-bit MSB '10' to '11', and combine it with the 3-bit LSB '100' to form '11100', so as to correspond to the row with index 28 in the legacy MCS index table, and determine that the modulation order adopted for Msg3 retransmission is q, that is, the corresponding modulation method is pi / 2 BPSK.

[0272] In the embodiment of the present application, when determining the MCS index, it is determined by interpreting the bits other than the 3 bits used to indicate the MCS in the original 5-bit MCS as 1, ensuring that the MCS used during Msg3 retransmission can meet the TBS requirements for retransmission and improving the reliability of uplink access.

[0273] In some embodiments, the MCS for Msg3 retransmission is determined by the bits used to indicate the MCS in the DCI, including:

[0274] Determine the X-bit bits used to indicate the MCS in the DCI;

[0275] Using the X-bit bits as the low-order bits and the bits with a value of 1 for the 5 - X bits as the high-order bits, generate new 5-bit bits;

[0276] Determine the first MCS index according to the new 5-bit bits;

[0277] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0278] Specifically, in the embodiment of the present application, the MCS adopted by the UE in the MCS index table is determined by the X bits indicating the MCS.

[0279] The MCS index table in the embodiment of the present application adopts the legacy MCS index table (such as Table 2).

[0280] When determining the MCS index, it is jointly determined by the 5 - X high-order bits and the X bits indicating the MCS, and the 5 - X high-order bits are all 1. The specific steps are as follows:

[0281] The UE determines the X-bit bits used to indicate the MCS in the DCI.

[0282] The UE uses the X-bit bits as the low-order bits and the bits with a value of 1 for the 5 - X bits as the high-order bits to generate new 5-bit bits.

[0283] The UE determines the first MCS index according to the new 5-bit bits.

[0284] The UE determines the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table (legacy MCS index table).

[0285] Among them, the X-bit bits can be the high-order X-bit bits in the MCS indication field in the DCI, or the low-order X-bit bits in the MCS indication field in the DCI. The value of X can be 2 or 3.

[0286] For example, reuse the mechanism during existing retransmissions, that is, as much as possible, the bits used to indicate the MCS are indicated to the MCS indexes in the legacy MCSindex table where 28 ≤ I MCS ≤ 31. The X-bit MCS used to indicate the MCS is restored to 5 bits by padding 1 at the high positions, so as to implement 28 ≤ I MCS ≤ 31 in the legacy MCS index table. Assume that when the UE retransmits Msg3, all 3 remaining bits used to indicate the MCS are used to determine the MCS of the retransmission. When these 3 bits are '101', the MCS field is changed to '11101' by adding 2 bits '11' at the high positions, so as to correspond to a row with index 29 in the legacy MCS index table, and it is determined that the modulation order of the Msg3 retransmission is 2, that is, the corresponding modulation method is QPSK. Among them, the 3-bit MCS can be the high 3 bits or the low 3 bits of the original 5-bit MCS field. This embodiment only focuses on the remaining 3 bits still used for MCS indication, and completes the 5-bit MCS index indication by padding '11' at the high positions.

[0287] Similarly, if the UE uses a 2-bit MCS field to determine the MCS of the Msg3 retransmission when retransmitting Msg3, when these 2 bits are '10', the indication of the MCS field is changed to '11110' by adding 3 bits '111' at the high positions, so as to correspond to a row with index 30 in the legacy MCS index table, and it is determined that the modulation order of the Msg3 retransmission is 4, that is, the corresponding modulation method is 16QAM. Among them, the 2-bit MCS can be any 2 bits of the remaining 3 bits still used for MCS indication. This embodiment only focuses on the 2 bits used for MCS indication, and completes the 5-bit MCS index indication by padding '111' at the high positions.

[0288] In the embodiment of this application, when determining the MCS index, it is jointly determined by the high positions of 5 - X bits and the X bits indicating the MCS. The high positions of 5 - X bits are all 1, ensuring that the MCS used during the Msg3 retransmission can meet the TBS requirements of the retransmission, and improving the reliability of the uplink access.

[0289] In some embodiments, the MCS during the Msg3 retransmission is determined by the bits used to indicate the MCS in the DCI, including:

[0290] Determine the X-bit bits used to indicate the MCS in the DCI;

[0291] Determine the second MCS index according to the X-bit bits, and the offset of the MCS index;

[0292] Determine the first MCS index according to the second MCS index and the offset;

[0293] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0294] Specifically, in the embodiment of the present application, the MCS adopted by the UE in the MCS index table is determined by the X bits indicating the MCS.

[0295] The MCS index table in the embodiment of the present application adopts the legacy MCS index table (such as Table 2).

[0296] When determining the MCS index, it is jointly determined by the X bits indicating the MCS and the offset, and the offset is (32 - 2^X). The specific steps are as follows:

[0297] The UE determines the X-bit bits in the DCI used to indicate the MCS.

[0298] The UE determines the second MCS index according to the X-bit bits, and the offset of the MCS index.

[0299] The UE determines the first MCS index according to the second MCS index and the offset.

[0300] The UE determines the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table (legacy MCS index table).

[0301] Wherein, the offset is (32 - 2^X). The X-bit bits can be the high X-bit bits in the MCS indication field in the DCI, or the low X-bit bits in the MCS indication field in the DCI. The value of X can be 2 or 3.

[0302] For example, reuse the mechanism during existing retransmission, that is, try to indicate the bits used to indicate the MCS to the range where the MCS index in the legacy MCS index table is 28 ≤ I MCS ≤ 31. Realize the range of MCS indication 28 ≤ I by increasing the value indicated by the X bits still used to indicate the MCS by the offset MCS ≤ 31. Assume that when the UE retransmits Msg3, all the remaining 3 bits used to indicate the MCS are adopted to determine the retransmitted MCS. At this time, the offset is 32 - 2^3 = 24. When the 3 bits are '101', the corresponding value is 5. Increase the corresponding value by the offset of 24, so as to correspond to the row with index 29 in the legacy MCS index table, and determine that the modulation order adopted for Msg3 retransmission is 2, that is, the modulation mode is QPSK. Among them, the 3-bit MCS can be the high 3 bits or the low 3 bits in the original 5-bit MCS field. This embodiment only focuses on the value corresponding to the remaining 3 bits still used to indicate the MCS, and completes the MCS index indication after increasing the offset.

[0303] Similarly, assume that when the UE retransmits Msg3, 2 bits are used to determine the retransmitted MCS, and the offset is 32 - 2^2 = 28. When the 2 bits are '10', the corresponding value is 2. Add the offset of 28 to the corresponding value, so as to correspond to the row with index 30 in the legacy MCSindex table, and determine that the modulation order used for Msg3 retransmission is 4, that is, the modulation method is 16QAM. Among them, the 2-bit MCS can be any 2 bits of the remaining 3 bits still used to indicate the MCS. This embodiment only focuses on the value corresponding to the 2 bits used for MCS indication, and completes the MCS index indication after adding the offset.

[0304] In the embodiment of the present application, when determining the MCS index, it is jointly determined by the X bits indicating the MCS and the offset, ensuring that the MCS used during Msg3 retransmission can meet the TBS requirements for retransmission, and improving the reliability of uplink access.

[0305] In some embodiments, the MCS for Msg3 retransmission is determined by the bits used to indicate the MCS in the DCI, including:

[0306] Determine the X-bit bits used to indicate the MCS in the DCI;

[0307] Determine the first MCS index according to the X-bit bits;

[0308] Determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table. Each row in the second MCS index table only includes the modulation order, and the TBS for retransmitting Msg3 is the TBS for the initial transmission of Msg3, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit bits.

[0309] Specifically, in the embodiment of the present application, the MCS adopted by the UE in the MCS index table is determined by the X bits indicating the MCS.

[0310] The MCS index table in the embodiment of the present application adopts a redefined MCS index table.

[0311] The specific steps for determining the MCS for Msg3 retransmission by the bits used to indicate the MCS in the DCI are as follows:

[0312] The UE determines the X-bit bits used to indicate the MCS in the DCI.

[0313] The UE determines the first MCS index according to the X-bit bits.

[0314] The UE determines the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table (redefined MCS index table). Each row in the second MCS index table only includes the modulation order, and the TBS for retransmitting Msg3 is the TBS of the initial transmission of Msg3, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by X - bit.

[0315] Wherein, the X - bit can be the high - order X - bits in the MCS indication field in the DCI, or the low - order X - bits in the MCS indication field in the DCI. The value of X can be 2 or 3.

[0316] The embodiment of this application defines a new MCS index table, as shown in Table 3, and indicates the corresponding MCS through the bits used to indicate the MCS. Each row in the MCS index table only contains the modulation order, and can correspond to several rows of MCS for retransmission in the legacy MCS index table. For example, the four rows with MCS indices 28 - 31 in Table 2. When the MCS indicated by the DCI only includes the modulation order, the TBS for Msg3 retransmission directly adopts the TBS calculated during the initial transmission. At this time, any 2 bits in the bits still used to indicate the MCS in the original 5 - bit MCS correspond one - to - one with the MCS index in Table 3, and thus the MCS corresponding to Msg3 retransmission can be indicated by 2 - bit MCS.

[0317] Table 3 defines one of the new MCS index tables

[0318] <![CDATA[I MCS > <![CDATA[Q m > r 0 q Reserved 1 2 Reserved 2 4 Reserved 3 6 Reserved

[0319] For example, when the 2 - bit is '01', it corresponds to the index 1 in Table 3. At this time, the modulation order is 2, that is, the UE uses QPSK for modulation.

[0320] Of course, it can also be that any 3 bits still used to indicate the MCS correspond one - to - one with the MCS index in the following table. For example, when the 3 - bit is '000', it corresponds to the index 0 in Table 3. At this time, the modulation order is q, that is, the UE uses pi / 2BPSK for modulation.

[0321] Similarly, the second MCS index table can also be as shown in Table 4, where the candidate values (candidate value) used to indicate the MCS correspond one - to - one with the MCS index.

[0322] Table 4 defines another new MCS index table

[0323] <![CDATA[I MCS > <![CDATA[Q m > r 0 2 Reserved 1 4 Reserved 2 6 Reserved

[0324] In the embodiments of the present application, the MCS for Msg3 retransmission is determined by indicating the X bits of the MCS and the redefined MCS index table, ensuring that the MCS used for Msg3 retransmission can meet the TBS requirements for retransmission and improving the reliability of uplink access.

[0325] In some embodiments, the MCS for Msg3 retransmission is determined by the bits used to indicate the MCS in the DCI, including:

[0326] Determine the X-bit used to indicate the MCS in the DCI;

[0327] Determine the first MCS index according to the X-bit;

[0328] Determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table. The third MCS index table contains the MCS elements in the MCS index table used for the initial transmission of Msg3 and the MCS elements in the second MCS index table. The MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3.

[0329] Specifically, in the embodiments of the present application, the MCS adopted by the UE in the MCS index table is determined by indicating the X bits of the MCS.

[0330] The MCS index table in the embodiments of the present application adopts a redefined MCS index table.

[0331] The specific steps for determining the MCS for Msg3 retransmission by the bits used to indicate the MCS in the DCI are as follows:

[0332] The UE determines the X-bit used to indicate the MCS in the DCI.

[0333] The UE determines the first MCS index according to the X-bit.

[0334] The UE determines the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table (redefined MCS index table). The third MCS index table contains the MCS elements in the MCS index table used for the initial transmission of Msg3 and the MCS elements in the second MCS index table (redefined MCS index table). The MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3.

[0335] Among them, the X - bit can be the upper 3 bits in the MCS indication field in the DCI, or the lower 3 bits in the MCS indication field in the DCI.

[0336] The embodiment of this application defines a new MCS index table (the third MCS index table). As shown in Table 5, the corresponding MCS is indicated by the bits used to indicate MCS. The third MCS index table contains all the MCSs in the MCS index table used during the initial transmission and all the MCSs in the second MCS index table in the above - mentioned embodiment. The combination of the MCS index and the specific MCS in the third MCS index table can be arbitrary. For example, the first few rows of the third MCS index table are the second MCS index table, and the last few rows are the MCS index table used during the initial transmission. At this time, the 3 bits still used to indicate MCS correspond one - to - one with the MCS index in the third MCS index table, that is, the MCS corresponding to the Msg3 re - transmission can be indicated by 3 bits.

[0337] Table 5 Definition of the new MCS index table III

[0338] <![CDATA[I MCS > <![CDATA[Q m > r 0 q 240 / q 1 q 314 / q 2 2 193 3 2 251 4 q Reserved 5 2 Reserved 6 4 Reserved 7 6 Reserved

[0339] For example, when the 3 bits are '101', the MCS index is 5, the modulation order is 2, the UE uses QPSK for modulation, and the coding rate r can be calculated according to the TBS during the initial transmission and the modulation order 2.

[0340] In addition, when SIB1 does not configure an MCS index table for the Msg3 initial transmission, the first four rows corresponding to 0 ≤ I MCS ≤ 3 in the legacy MCS index table are default - selected for the Msg3 initial transmission. At this time, the first four rows of the third MCS index table are the four rows in the legacy MCS index table where I MCS is {0, 1, 2, 3}.

[0341] Furthermore, the third MCS index table can also be as shown in Table 6. The MCS index table used during the Msg3 initial transmission included in the third MCS index table can also be four candidate MCSs selected from the legacy MCS index table configured by SIB1. For example, the candidate MCSs are the four rows in the legacy MCS index table where I MCS is {1, 6, 9, 14}.

[0342] Table 6 Definition of the new MCS index table IV

[0343]

[0344]

[0345] In the embodiments of the present application, the MCS for Msg3 retransmission is determined by indicating the X bits of the MCS and the redefined MCS index table, ensuring that the MCS used for Msg3 retransmission can meet the TBS requirements for retransmission, and improving the reliability of uplink access.

[0346] In some embodiments, the MCS for Msg3 retransmission is determined by the bits for indicating the MCS in the DCI, including:

[0347] Determine the highest bit or the lowest bit of the X-bit for indicating the MCS in the DCI;

[0348] Determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X - 1 bits of the X-bit except the highest bit or the lowest bit; the fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3 or the second MCS index table, and when the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3, and when the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3;

[0349] Determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0350] Specifically, in the embodiments of the present application, the MCS adopted by the UE in the MCS index table is determined by indicating the X bits of the MCS.

[0351] The MCS index table in the embodiments of the present application adopts the MCS index table used for the initial transmission of Msg3 or the redefined MCS index table.

[0352] The specific steps for determining the MCS for Msg3 retransmission by the bits for indicating the MCS in the DCI are as follows:

[0353] The UE determines the highest bit or the lowest bit of the X-bit for indicating the MCS in the DCI.

[0354] The UE determines the fourth MCS index table according to the most significant bit or the least significant bit of the X-bit, and determines the first MCS index according to the X-1 bits of the X-bit except the most significant bit or the least significant bit; the fourth MCS index table is the same as the MCS index table used during the initial transmission of Msg3 or the second MCS index table (redefined MCS index table), and when the most significant bit or the least significant bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used during the initial transmission of Msg3, and when the most significant bit or the least significant bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table only includes the modulation order, and the TBS of the Msg3 retransmission is the TBS of the Msg3 initial transmission.

[0355] The UE determines the MCS for the Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0356] Among them, the X-bit can be the upper 3 bits in the MCS indication field in the DCI, or the lower 3 bits in the MCS indication field in the DCI.

[0357] The embodiment of the present application is based on the MCS index table used during the initial transmission of Msg3 or the redefined MCS index table, and indicates the corresponding MCS through the bit used to indicate the MCS. The MCS index table can be the MCS index table used during the initial transmission of Msg3, or the second MCS index table (redefined MCS index table) in the above embodiment, and needs to be indicated by any 1 bit (such as the most significant bit) in the 3 bits used to indicate the MCS.

[0358] For example, when this 1 bit is '0', the MCS index table used during the initial transmission of Msg3 is adopted; when this 1 bit is '1', the second MCS index table in the above embodiment is adopted. At this time, the MCS corresponding to the Msg3 retransmission can be indicated by the 3 bits still used to indicate the MCS. When the 3 bits are '101', the most significant bit '1' represents adopting the second MCS index table in the above embodiment, and the lower 2 bits '01' indicate the index 1 in the second MCS index table, corresponding to the MCS in the second row of the second MCS index table, that is, the modulation order is 2, and QPSK modulation is adopted.

[0359] The embodiment of the present application determines the MCS for the Msg3 retransmission through the X bits used to indicate the MCS based on the MCS index table used during the initial transmission of Msg3 or the redefined MCS index table, ensuring that the MCS used during the Msg3 retransmission can meet the TBS requirements of the retransmission, and improving the reliability of the uplink access.

[0360] In some embodiments, determining the MCS during Msg3 retransmission based on the bits used to indicate the MCS in DCI includes:

[0361] Determining the X - bit used to indicate the MCS in DCI;

[0362] Determining a first MCS index based on the X - bit;

[0363] Determining the MCS during Msg3 retransmission based on the first MCS index and a fifth MCS index table. The fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table. The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X - bit. Each row in the second MCS index table includes only the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; some MCS elements in the first MCS index table that make up the fifth MCS index table are associated with the MCS used for Msg3 initial transmission.

[0364] Specifically, in the embodiments of the present application, the MCS adopted by the UE in the MCS index table is determined by the X - bits indicating the MCS.

[0365] The MCS index table in the embodiments of the present application uses a re - defined MCS index table.

[0366] The specific steps for determining the MCS during Msg3 retransmission based on the bits used to indicate the MCS in DCI are as follows:

[0367] The UE determines the X - bit used to indicate the MCS in DCI.

[0368] The UE determines a first MCS index based on the X - bit.

[0369] The UE determines the MCS during Msg3 retransmission based on the first MCS index and a fifth MCS index table (re - defined MCS index table). The fifth MCS index table is formed by combining some MCS elements in the first MCS index table (legacy MCS index table) and some or all MCS elements in the second MCS index table (re - defined MCS index table). The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X - bit. Each row in the second MCS index table includes only the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; some MCS elements in the first MCS index table that make up the fifth MCS index table are associated with the MCS used for Msg3 initial transmission.

[0370] Among them, the X - bit can be the upper 3 bits in the MCS indication field in the DCI, or the lower 3 bits in the MCS indication field in the DCI.

[0371] The embodiments of this application define a new MCS index table, and use the bits for indicating MCS to indicate the corresponding MCS. The MCS index table includes some MCSs in the legacy MCS index table and some or all MCSs in the MCS index table in the second MCS index table in the above - mentioned embodiments. There are 3 bits in the re - transmitted DCI for indicating MCS, which can indicate 8 MCS indexes.

[0372] Some candidate MCSs in the legacy MCS index table are to dynamically delimit a continuous MCS index range based on the MCS adopted in the initial transmission of Msg3 in the legacy MCS index table.

[0373] The size of the MCS index range is jointly determined by the X bits for indicating MCS and the number of MCS indexes in the second MCS index table included in the fifth MCS index table.

[0374] Assume that the MCS with MCS index 2 in the legacy MCS index table is adopted in the initial transmission of Msg3, that is, the modulation order is 2. As shown in Table 7, the fifth MCS index table can include two MCSs in Table 3 whose corresponding modulation orders are less than or equal to 2. The remaining 6 (8−2 = 6) MCS indexes can be dynamically delimited from the legacy MCS index table with MCS index 2 as the basis to form a continuous MCS index range, such as 0≤I MCS ≤5. The combination of MCS indexes and specific MCSs in the fifth MCS index table can be arbitrary. In this embodiment, the candidate MCSs in the legacy MCS index table are placed in the first few rows.

[0375] Table 7 Definition of the Fifth New MCS Index Table

[0376] <![CDATA[I MCS > <![CDATA[Q m > r 0 q 240 / q 1 q 314 / q 2 2 193 3 2 251 4 2 308 5 2 379 6 q Reserved 7 2 Reserved

[0377] In addition, the fifth MCS index table can also include the MCS with a corresponding modulation order equal to 2 in Table 3, and the remaining 7 (8−1 = 7) MCS indexes are dynamically delimited from the legacy MCS index table with MCS index 2 as the basis to form a continuous MCS index range.

[0378] Furthermore, the fifth MCS index table may also completely contain Table 3, and the remaining 4 (8 - 4 = 4) MCS indexes are dynamically delimited from the legacyMCS index table as a continuous MCS index range based on the MCS index 2. Try to place the initial transmission MCS of Msg3 at the middle position of the dynamically delimited MCS index range.

[0379] In the embodiment of the present application, by indicating the X bit of the MCS and redefining the MCS index table to determine the MCS during Msg3 retransmission, it is ensured that the MCS used during Msg3 retransmission can meet the TBS requirements for retransmission, improving the reliability of uplink access.

[0380] In some embodiments, determining the MCS during Msg3 retransmission by a predefined method includes:

[0381] Determine that the modulation order of the MCS during Msg3 retransmission is a preset value M.

[0382] Specifically, in the embodiment of the present application, the MCS during Msg3 retransmission is determined by a predefined method. The TBS of Msg3 retransmission is the TBS of Msg3 initial transmission. The modulation order corresponding to the MCS adopted by the predefined UE is fixed as M.

[0383] The modulation order M can be q(pi / 2BPSK), and the modulation order M can also be 2 (QPSK).

[0384] For example, the protocol predefines that the modulation order adopted during Msg3 retransmission is fixed as 2, that is, corresponding to QPSK modulation. Subsequently, the coding rate r of Msg3 retransmission can be calculated through the TBS of Msg3 initial transmission and the modulation order 2, and then the Msg3 retransmission is completed.

[0385] In the embodiment of the present application, the modulation order corresponding to the MCS adopted by the predefined UE is a fixed value, ensuring that the MCS used during Msg3 retransmission can meet the TBS requirements for retransmission, improving the reliability of uplink access.

[0386] In some embodiments, determining the MCS during Msg3 retransmission by a predefined method includes:

[0387] Determine that the modulation order of the MCS during Msg3 retransmission is the modulation order of the MCS adopted during Msg3 initial transmission.

[0388] Specifically, in the embodiment of the present application, the MCS during Msg3 retransmission is determined by a predefined method. The TBS of Msg3 retransmission is the TBS of Msg3 initial transmission. The modulation order of the MCS during Msg3 retransmission by the predefined UE is the modulation order of the MCS adopted during Msg3 initial transmission.

[0389] For example, the protocol may predefine that the modulation order adopted for Msg3 retransmission is the same as that adopted for the initial transmission of Msg3. Suppose the modulation order adopted for the initial transmission of Msg3 is q. Then, in this embodiment, the modulation order adopted for Msg3 retransmission is also q, which corresponds to pi / 2 BPSK modulation. Subsequently, the coding rate r of Msg3 retransmission can be calculated through the TBS of the initial transmission of Msg3 and the modulation order q, and then the Msg3 retransmission is completed.

[0390] In the embodiment of the present application, it is predefined that the modulation order of the MCS when the UE performs Msg3 retransmission is the same as the modulation order of the MCS adopted during the initial transmission of Msg3, ensuring that the MCS used during Msg3 retransmission can meet the TBS requirements of retransmission and improving the reliability of uplink access.

[0391] In some embodiments, the MCS when Msg3 is retransmitted is determined through the bits in the DCI for indicating the MCS and a predefined method, including:

[0392] Determine that the candidate MCS adopted during the initial transmission of Msg3 is the default value, or determine that the modulation orders of the candidate MCSs adopted during the initial transmission of Msg3 do not exceed P;

[0393] Determine the modulation order corresponding to the MCS when Msg3 is retransmitted as N through a predefined method.

[0394] Specifically, in the embodiment of the present application, the MCS when Msg3 is retransmitted is determined through the bits in the DCI for indicating the MCS and a predefined method.

[0395] In the embodiment of the present application, it is first necessary to determine the MCS adopted during the initial transmission of Msg3. If it is determined that the candidate MCS adopted during the initial transmission of Msg3 is the default value, or it is determined that the modulation orders of the candidate MCSs adopted during the initial transmission of Msg3 do not exceed P, then the UE determines the modulation order corresponding to the MCS when Msg3 is retransmitted as N through a predefined method.

[0396] The value of the modulation order N can be q (pi / 2 BPSK), and the value of the modulation order N can also be 2 (QPSK). The value of P can be 2.

[0397] The specific method for the UE to determine the MCS when Msg3 is retransmitted through a predefined method can be the same as any of the above embodiments for determining the MCS when Msg3 is retransmitted through a predefined method, and will not be elaborated here.

[0398] For example, when Msg3 is initially transmitted, no candidate MCS is configured. That is, the optional MCSs when Msg3 is initially transmitted are the default MCSs 0 to MCS 3 in the legacy MCSindex table, or all the candidate MCSs optional for Msg3 initial transmission are configured by SIB, and the modulation orders corresponding to all the candidate MCSs configured by SIB do not exceed 2. Then, the UE uses the predefined modulation order 2 when Msg3 is retransmitted, that is, corresponding to QPSK modulation. Subsequently, the coding rate r of Msg3 retransmission can be calculated through the TBS of Msg3 initial transmission and the modulation order 2, and then the Msg3 retransmission is completed.

[0399] In the embodiment of the present application, the MCS when Msg3 is retransmitted is determined by the bit used to indicate the MCS in DCI and a predefined manner, ensuring that the MCS used when Msg3 is retransmitted can meet the TBS requirements for retransmission and improving the reliability of uplink access.

[0400] In some embodiments, determining the MCS when Msg3 is retransmitted by the bit used to indicate the MCS in DCI and a predefined manner includes:

[0401] Determining that the candidate MCSs adopted during the initial transmission of Msg3 are configured by SIB1, or at least one of the candidate MCSs adopted during the initial transmission of Msg3 has a modulation order exceeding P;

[0402] Determining the MCS when Msg3 is retransmitted through the bit used to indicate the MCS in DCI.

[0403] Specifically, in the embodiment of the present application, the MCS when Msg3 is retransmitted is determined by the bit used to indicate the MCS in DCI and a predefined manner.

[0404] In the embodiment of the present application, first, it is necessary to determine the MCS adopted during the initial transmission of Msg3. If it is determined that the candidate MCSs adopted during the initial transmission of Msg3 are configured by SIB1, or at least one of the candidate MCSs adopted during the initial transmission of Msg3 has a modulation order exceeding P, then the UE determines the MCS when Msg3 is retransmitted through the bit used to indicate the MCS in DCI.

[0405] The value of the modulation order N can be q(pi / 2BPSK), and the value of the modulation order N can also be 2 (QPSK). The value of P can be 2.

[0406] The specific manner in which the UE determines the MCS when Msg3 is retransmitted through the bit used to indicate the MCS in DCI can be the same as any of the above embodiments in which the MCS when Msg3 is retransmitted is determined through the bit used to indicate the MCS in DCI, and will not be elaborated here.

[0407] For example, if the candidate MCS that is optional only during the initial transmission is configured by SIB1, or the candidate MCS that is optional during the initial transmission is configured by SIB1 and at least one of the configured candidate MCSs has a modulation order exceeding 2, then the index of the MCS used by the UE during the Msg3 retransmission is determined by interpreting the bits other than the 3 bits used to indicate the MCS in the original 5-bit MCS as 1s.

[0408] In the embodiments of the present application, the MCS during the Msg3 retransmission is determined by the bits used to indicate the MCS in the DCI and a predefined method, ensuring that the MCS used during the Msg3 retransmission can meet the TBS requirements for retransmission and improving the reliability of the uplink access.

[0409] It should be noted that: the X bits used to indicate the MCS in the above embodiments may be some bits reused from the MCS field, or may be X bits separately split from the original 5-bit MCS field for indicating the MCS. The present invention does not limit this, and focuses on how to determine the MCS used during the Msg3 retransmission according to the X bits still used to indicate the MCS.

[0410] Figure 2 is a schematic flowchart of the Msg3 receiving method provided by the embodiments of the present application. As Figure 2 shown, the embodiments of the present application provide a Msg3 receiving method, and the execution subject thereof may be a network-side device, such as a base station, etc. This method includes:

[0411] Step 201: Send DCI for scheduling the Msg3 retransmission to the terminal;

[0412] Step 202: Receive the Msg3 retransmission sent by the terminal, where the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by the bits used to indicate the MCS in the DCI, and the number of bits used to indicate the MCS is less than 5; and / or, the MCS of the Msg3 retransmission is predefined.

[0413] In some embodiments, indicating the MCS during the Msg3 retransmission by the bits used to indicate the MCS in the DCI includes:

[0414] Update the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit value indicated by the MCS indication field; the bits used to indicate the MCS in the DCI are the low 3 bits in the MCS indication field of the DCI;

[0415] Determine a first MCS index according to the new 5-bit value indicated by the MCS indication field;

[0416] Determine the MCS during the Msg3 retransmission according to the first MCS index and a first MCS index table.

[0417] In some embodiments, the MCS for Msg3 retransmission is indicated by the bit used to indicate the MCS in the DCI, including:

[0418] Determine the X-bit in the DCI used to indicate the MCS;

[0419] Using the X-bit as the low-order bit and bits with a value of 1 for the 5 - X bits as the high-order bits, generate new 5-bit;

[0420] Determine the first MCS index according to the new 5-bit;

[0421] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0422] In some embodiments, the MCS for Msg3 retransmission is indicated by the bit used to indicate the MCS in the DCI, including:

[0423] Determine the X-bit in the DCI used to indicate the MCS;

[0424] Determine the second MCS index and the offset of the MCS index according to the X-bit;

[0425] Determine the first MCS index according to the second MCS index and the offset;

[0426] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0427] In some embodiments, the offset is (32 - 2^X).

[0428] In some embodiments, the MCS for Msg3 retransmission is indicated by the bit used to indicate the MCS in the DCI, including:

[0429] Determine the X-bit in the DCI used to indicate the MCS;

[0430] Determine the first MCS index according to the X-bit;

[0431] Determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table, where each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit.

[0432] In some embodiments, the X - bit is the high - order X - bit or the low - order X - bit in the MCS indication field in the DCI.

[0433] In some embodiments, the value of X is 2 or 3.

[0434] In some embodiments, indicating the MCS during Msg3 re - transmission by the bits for indicating MCS in the DCI includes:

[0435] Determine the X - bit for indicating MCS in the DCI;

[0436] Determine a first MCS index according to the X - bit;

[0437] Determine the MCS during Msg3 re - transmission according to the first MCS index and a third MCS index table, where the third MCS index table includes the MCS elements in the MCS index table used for the initial transmission of Msg3 and the MCS elements in a second MCS index table. The MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X - bit. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 re - transmission is the same as the TBS of Msg3 initial transmission.

[0438] In some embodiments, indicating the MCS during Msg3 re - transmission by the bits for indicating MCS in the DCI includes:

[0439] Determine the highest - order bit or the lowest - order bit of the X - bit for indicating MCS in the DCI;

[0440] Determine a fourth MCS index table according to the highest - order bit or the lowest - order bit of the X - bit, and determine a first MCS index according to the X - 1 bits of the X - bit except the highest - order bit or the lowest - order bit. The fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3 or the second MCS index table. When the highest - order bit or the lowest - order bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3. When the highest - order bit or the lowest - order bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 re - transmission is the same as the TBS of Msg3 initial transmission;

[0441] Determine the MCS during Msg3 re - transmission according to the first MCS index and the fourth MCS index table.

[0442] In some embodiments, indicating the MCS during Msg3 re - transmission by the bits for indicating MCS in the DCI includes:

[0443] Determine the X-bit in the DCI for indicating the MCS;

[0444] Determine the first MCS index according to the X-bit;

[0445] Determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table. The fifth MCS index table is formed by combining partial MCS elements in the first MCS index table and partial or all MCS elements in the second MCS index table. The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the same as the TBS for the initial transmission of Msg3. The partial MCS elements in the first MCS index table that make up the fifth MCS index table are associated with the MCS used for the initial transmission of Msg3.

[0446] In some embodiments, the X-bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

[0447] In some embodiments, predefining the MCS for Msg3 retransmission includes:

[0448] Determine that the modulation order of the MCS for Msg3 retransmission is a preset value M.

[0449] In some embodiments, the value of M is 2.

[0450] In some embodiments, predefining the MCS for Msg3 retransmission includes:

[0451] Determine that the modulation order of the MCS for Msg3 retransmission is the modulation order of the MCS used for the initial transmission of Msg3.

[0452] In some embodiments, indicating the MCS for Msg3 retransmission through the bit for indicating the MCS in the DCI and a predefined manner includes:

[0453] Determine that the candidate MCS used for the initial transmission of Msg3 is the default value, or determine that the modulation orders of the candidate MCSs used for the initial transmission of Msg3 do not exceed P;

[0454] Determine the modulation order corresponding to the MCS for Msg3 retransmission to be N through a predefined manner.

[0455] In some embodiments, the value of N is q or 2.

[0456] In some embodiments, indicating the MCS for Msg3 retransmission through the bit for indicating the MCS in the DCI and a predefined manner includes:

[0457] Determine that the candidate MCS used at the initial transmission of Msg3 is configured by SIB1, or at least one MCS among the candidate MCSs used at the initial transmission of Msg3 has a modulation order exceeding P;

[0458] Indicate the MCS at the retransmission of Msg3 through the bit used to indicate MCS in the DCI.

[0459] In some embodiments, the value of P is 2.

[0460] Specifically, for the Msg3 receiving method provided in the embodiments of the present application, reference may be made to the embodiments of the Msg3 sending method with the execution subject being the terminal, and the same technical effects can be achieved. The same or corresponding parts and beneficial effects in this embodiment as those in the corresponding method embodiments above will not be specifically elaborated herein.

[0461] Figure 3 It is a schematic structural diagram of a terminal provided in the embodiments of the present application, as Figure 3 shown, the terminal includes a memory 320, a transceiver 300, and a processor 310, where:

[0462] The memory 320 is used to store computer programs; the transceiver 300 is used to send and receive data under the control of the processor 310; the processor 310 is used to read the computer programs in the memory 320 and perform the following operations:

[0463] Receive the DCI for scheduling the retransmission of Msg3 sent by the network side device;

[0464] In the case of determining that the number of bits used to indicate MCS in the DCI is less than 5 bits, determine the MCS at the retransmission of Msg3 through the bit used to indicate MCS in the DCI; and / or determine the MCS at the retransmission of Msg3 through a predefined method;

[0465] Send the retransmission of Msg3 according to the determined MCS at the retransmission of Msg3.

[0466] Specifically, the transceiver 300 is used to receive and send data under the control of the processor 310.

[0467] Among them, in Figure 3Among them, the bus architecture may include any number of interconnected buses and bridges, specifically, various circuits represented by one or more processors represented by the processor 310 and the memory represented by the memory 320 are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and therefore will not be further described herein. The bus interface provides an interface. The transceiver 300 may be multiple components, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium, and these transmission mediums include wireless channels, wired channels, optical fiber cables, and other transmission mediums. For different user devices, the user interface 330 may also be an interface capable of externally connecting and internally connecting required devices, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, etc.

[0468] The processor 310 is responsible for managing the bus architecture and general processing, and the memory 320 may store data used by the processor 310 when performing operations.

[0469] In some embodiments, the processor 310 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device), and the processor may also adopt a multi-core architecture.

[0470] The processor is used to execute any one of the methods provided in the embodiments of the present application according to the obtained executable instructions by calling the computer program stored in the memory. The processor and the memory may also be physically separated.

[0471] In some embodiments, determining the MCS at the time of Msg3 retransmission by the bits in the DCI for indicating the MCS includes:

[0472] Updating both the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit bit indicated by the MCS indication field; the bits in the DCI for indicating the MCS are the low 3-bit bits in the MCS indication field in the DCI;

[0473] Determining a first MCS index according to the new 5-bit bit indicated by the MCS indication field;

[0474] Determining the MCS at the time of Msg3 retransmission according to the first MCS index and the first MCS index table.

[0475] In some embodiments, determining the MCS for Msg3 retransmission based on the bits in the DCI for indicating MCS includes:

[0476] Determining the X-bit in the DCI for indicating MCS;

[0477] Using the X-bit as the low-order bits and using bits with 5-X bits all being 1 as the high-order bits to generate new 5-bit;

[0478] Determining the first MCS index according to the new 5-bit;

[0479] Determining the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0480] In some embodiments, determining the MCS for Msg3 retransmission based on the bits in the DCI for indicating MCS includes:

[0481] Determining the X-bit in the DCI for indicating MCS;

[0482] Determining the second MCS index and the offset of the MCS index according to the X-bit;

[0483] Determining the first MCS index according to the second MCS index and the offset;

[0484] Determining the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0485] In some embodiments, the offset is (32 - 2^X).

[0486] In some embodiments, determining the MCS for Msg3 retransmission based on the bits in the DCI for indicating MCS includes:

[0487] Determining the X-bit in the DCI for indicating MCS;

[0488] Determining the first MCS index according to the X-bit;

[0489] Determining the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table, where each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit.

[0490] In some embodiments, the X-bit is the high-order X-bit or the low-order X-bit in the MCS indication field in the DCI.

[0491] In some embodiments, the value of X is 2 or 3.

[0492] In some embodiments, determining the MCS at Msg3 retransmission through the bits in the DCI for indicating the MCS includes:

[0493] Determining X-bit bits in the DCI for indicating the MCS;

[0494] Determining a first MCS index according to the X-bit bits;

[0495] Determining the MCS at Msg3 retransmission according to the first MCS index and a third MCS index table, where the third MCS index table includes MCS elements in the MCS index table used at Msg3 initial transmission and MCS elements in a second MCS index table, the MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit bits, each row in the second MCS index table includes only modulation orders, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission.

[0496] In some embodiments, determining the MCS at Msg3 retransmission through the bits in the DCI for indicating the MCS includes:

[0497] Determining the most significant bit or the least significant bit of the X-bit bits in the DCI for indicating the MCS;

[0498] Determining a fourth MCS index table according to the most significant bit or the least significant bit of the X-bit bits, and determining a first MCS index according to the X - 1 bit bits in the X-bit bits except the most significant bit or the least significant bit; the fourth MCS index table is the same as the MCS index table used at Msg3 initial transmission or the second MCS index table, and when the most significant bit or the least significant bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used at Msg3 initial transmission, and when the most significant bit or the least significant bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table includes only modulation orders, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission;

[0499] Determining the MCS at Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0500] In some embodiments, determining the MCS at Msg3 retransmission through the bits in the DCI for indicating the MCS includes:

[0501] Determining X-bit bits in the DCI for indicating the MCS;

[0502] Determine a first MCS index according to the X-bit;

[0503] Determine the MCS for Msg3 retransmission according to the first MCS index and a fifth MCS index table, where the fifth MCS index table is formed by combining some MCS elements in a first MCS index table and some or all MCS elements in a second MCS index table. The MCS indexes in the fifth MCS index table correspond to the MCS indexes corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the same as the TBS for the initial transmission of Msg3. The part of the MCS elements in the first MCS index table that constitutes the fifth MCS index table is associated with the MCS used for the initial transmission of Msg3.

[0504] In some embodiments, the X-bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

[0505] In some embodiments, determining the MCS for Msg3 retransmission by a predefined method includes:

[0506] Determine that the modulation order of the MCS for Msg3 retransmission is a preset value M.

[0507] In some embodiments, the value of M is 2.

[0508] In some embodiments, determining the MCS for Msg3 retransmission by a predefined method includes:

[0509] Determine that the modulation order of the MCS for Msg3 retransmission is the same as the modulation order of the MCS used for the initial transmission of Msg3.

[0510] In some embodiments, determining the MCS for Msg3 retransmission by the bits in the DCI for indicating MCS and a predefined method includes:

[0511] Determine that the candidate MCS used for the initial transmission of Msg3 is a default value, or determine that the modulation orders of the candidate MCSs used for the initial transmission of Msg3 do not exceed P;

[0512] Determine the modulation order corresponding to the MCS for Msg3 retransmission by a predefined method as N.

[0513] In some embodiments, the value of N is q or 2.

[0514] In some embodiments, determining the MCS for Msg3 retransmission by the bits in the DCI for indicating MCS and a predefined method includes:

[0515] Determine that the candidate MCS used at the initial transmission of Msg3 is configured by SIB1, or at least one MCS among the candidate MCSs used at the initial transmission of Msg3 has a modulation order exceeding P;

[0516] Determine the MCS at the retransmission of Msg3 through the bits used to indicate the MCS in the DCI.

[0517] In some embodiments, the value of P is 2.

[0518] It should be noted here that the above terminal provided by the embodiments of the present application can implement all the method steps implemented by the method embodiments with the execution subject being the terminal, and can achieve the same technical effects. Here, the same or corresponding parts and beneficial effects in this embodiment as those in the method embodiments will not be specifically described again.

[0519] Figure 4 It is a schematic structural diagram of a network-side device provided by the embodiments of the present application, as Figure 4 shown, the network-side device includes a memory 420, a transceiver 400, and a processor 410, where:

[0520] The memory 420 is used to store computer programs; the transceiver 400 is used to send and receive data under the control of the processor 410; the processor 410 is used to read the computer programs in the memory 420 and perform the following operations:

[0521] Send DCI for scheduling the retransmission of Msg3 to the terminal;

[0522] Receive the retransmission of Msg3 sent by the terminal, where the retransmission of Msg3 is scheduled by the DCI; wherein, the MCS of the retransmission of Msg3 is indicated by the bits used to indicate the MCS in the DCI, and the number of bits used to indicate the MCS is less than 5; and / or, the MCS of the retransmission of Msg3 is predefined.

[0523] Specifically, the transceiver 400 is used to receive and send data under the control of the processor 410.

[0524] Among them, in Figure 4Among them, the bus architecture may include any number of interconnected buses and bridges, specifically various circuits represented by one or more processors represented by the processor 410 and the memory represented by the memory 420 are linked together. The bus architecture can also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and thus will not be further described herein. The bus interface provides an interface. The transceiver 400 can be a plurality of components, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium, and these transmission media include wireless channels, wired channels, optical fiber cables and other transmission media. The processor 410 is responsible for managing the bus architecture and general processing, and the memory 420 can store data used by the processor 410 when performing operations.

[0525] The processor 410 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor can also adopt a multi-core architecture.

[0526] In some embodiments, indicating the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI includes:

[0527] Updating both high 2-bit values of the MCS indication field in the DCI to 1 to obtain new 5-bit bits indicated by the MCS indication field; the bit for indicating the MCS in the DCI is the low 3-bit bits in the MCS indication field of the DCI;

[0528] Determining a first MCS index according to the new 5-bit bits indicated by the MCS indication field;

[0529] Determining the MCS at the time of Msg3 retransmission according to the first MCS index and the first MCS index table.

[0530] In some embodiments, indicating the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI includes:

[0531] Determining X-bit bits for indicating the MCS in the DCI;

[0532] Using the X-bit bits as low-order bits and bits with 5-X bit values all being 1 as high-order bits to generate new 5-bit bits;

[0533] Determining a first MCS index according to the new 5-bit bits;

[0534] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0535] In some embodiments, the MCS for Msg3 retransmission is indicated by the bits in the DCI for indicating the MCS, including:

[0536] Determine the X-bit in the DCI for indicating the MCS;

[0537] Determine the second MCS index and the offset of the MCS index according to the X-bit;

[0538] Determine the first MCS index according to the second MCS index and the offset;

[0539] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0540] In some embodiments, the offset is (32 - 2^X).

[0541] In some embodiments, the MCS for Msg3 retransmission is indicated by the bits in the DCI for indicating the MCS, including:

[0542] Determine the X-bit in the DCI for indicating the MCS;

[0543] Determine the first MCS index according to the X-bit;

[0544] Determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table, where each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit.

[0545] In some embodiments, the X-bit is the high X-bit or the low X-bit in the MCS indication field in the DCI.

[0546] In some embodiments, the value of X is 2 or 3.

[0547] In some embodiments, the MCS for Msg3 retransmission is indicated by the bits in the DCI for indicating the MCS, including:

[0548] Determine the X-bit in the DCI for indicating the MCS;

[0549] Determine the first MCS index according to the X-bit;

[0550] Determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table, where the third MCS index table includes the MCS elements in the MCS index table used for the initial transmission of Msg3 and the MCS elements in the second MCS index table. The MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3.

[0551] In some embodiments, indicating the MCS for Msg3 retransmission by the bits for indicating MCS in the DCI includes:

[0552] Determine the highest bit or the lowest bit of the X-bit for indicating MCS in the DCI;

[0553] Determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X-1 bits of the X-bit except the highest bit or the lowest bit. The fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3 or the second MCS index table. When the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3. When the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table. Each row in the second MCS index table only includes the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3;

[0554] Determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0555] In some embodiments, indicating the MCS for Msg3 retransmission by the bits for indicating MCS in the DCI includes:

[0556] Determine the X-bit for indicating MCS in the DCI;

[0557] Determine the first MCS index according to the X-bit;

[0558] Determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table. The fifth MCS index table is formed by combining partial MCS elements in the first MCS index table and partial or all MCS elements in the second MCS index table. The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the same as the TBS of Msg3 initial transmission. The partial MCS elements in the first MCS index table that make up the fifth MCS index table are associated with the MCS used for Msg3 initial transmission.

[0559] In some embodiments, the X-bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

[0560] In some embodiments, predefining the MCS for Msg3 retransmission includes:

[0561] Determine that the modulation order of the MCS for Msg3 retransmission is a preset value M.

[0562] In some embodiments, the value of M is 2.

[0563] In some embodiments, predefining the MCS for Msg3 retransmission includes:

[0564] Determine that the modulation order of the MCS for Msg3 retransmission is the modulation order of the MCS used for Msg3 initial transmission.

[0565] In some embodiments, indicating the MCS for Msg3 retransmission through the bits for indicating MCS in the DCI and a predefined manner includes:

[0566] Determine that the candidate MCS used for Msg3 initial transmission is the default value, or determine that the modulation orders of the candidate MCSs used for Msg3 initial transmission do not exceed P;

[0567] Determine the modulation order of the MCS corresponding to Msg3 retransmission as N through a predefined manner.

[0568] In some embodiments, the value of N is q or 2.

[0569] In some embodiments, indicating the MCS for Msg3 retransmission through the bits for indicating MCS in the DCI and a predefined manner includes:

[0570] Determine that the candidate MCS used for Msg3 initial transmission is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used for Msg3 initial transmission exceeds P;

[0571] The MCS for Msg3 retransmission is indicated by the bit for indicating MCS in the DCI.

[0572] In some embodiments, the value of P is 2.

[0573] Specifically, the above network-side device provided by the embodiments of the present application can implement all the method steps implemented by the method embodiments with the network-side device as the execution subject, and can achieve the same technical effects. Therefore, the same or corresponding parts and beneficial effects in this embodiment as those in the method embodiments will not be specifically described herein.

[0574] Figure 5 It is a schematic structural diagram of a Msg3 sending device provided by the embodiments of the present application. As Figure 5 shown, the embodiments of the present application provide a Msg3 sending device, including a first receiving module 501, a first determining module 502, and a first sending module 503, where:

[0575] The first receiving module 501 is configured to receive the DCI for scheduling Msg3 retransmission sent by the network-side device; the first determining module 502 is configured to determine the MCS for Msg3 retransmission through the bit for indicating MCS in the DCI when it is determined that the number of bits for indicating MCS in the DCI is less than 5 bits; and / or determine the MCS for Msg3 retransmission in a predefined manner; the first sending module 503 is configured to send the Msg3 retransmission according to the determined MCS for Msg3 retransmission.

[0576] In some embodiments, the first determining module is specifically configured to:

[0577] Update the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit value indicated by the MCS indication field; the bit for indicating MCS in the DCI is the low 3-bit bits in the MCS indication field in the DCI;

[0578] Determine a first MCS index according to the new 5-bit value indicated by the MCS indication field;

[0579] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0580] In some embodiments, the first determining module is specifically configured to:

[0581] Determine the X-bit bits for indicating MCS in the DCI;

[0582] Use the X-bit bits as the low-order bits, and use the bits with 5-X bit values all being 1 as the high-order bits to generate a new 5-bit value;

[0583] Determine a first MCS index according to the new 5-bit;

[0584] Determine the MCS at the retransmission of Msg3 according to the first MCS index and the first MCS index table.

[0585] In some embodiments, the first determining module is specifically configured to:

[0586] Determine the X-bit in the DCI for indicating the MCS;

[0587] Determine a second MCS index and an offset of the MCS index according to the X-bit;

[0588] Determine a first MCS index according to the second MCS index and the offset;

[0589] Determine the MCS at the retransmission of Msg3 according to the first MCS index and the first MCS index table.

[0590] In some embodiments, the offset is (32 - 2^X).

[0591] In some embodiments, the first determining module is specifically configured to:

[0592] Determine the X-bit in the DCI for indicating the MCS;

[0593] Determine a first MCS index according to the X-bit;

[0594] Determine the MCS at the retransmission of Msg3 according to the first MCS index and the second MCS index table, each row in the second MCS index table only includes the modulation order, and the TBS of the retransmission of Msg3 is the TBS of the initial transmission of Msg3, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit.

[0595] In some embodiments, the X-bit is the high X-bit or the low X-bit in the MCS indication field in the DCI.

[0596] In some embodiments, the value of X is 2 or 3.

[0597] In some embodiments, the first determining module is specifically configured to:

[0598] Determine the X-bit in the DCI for indicating the MCS;

[0599] Determine a first MCS index according to the X-bit;

[0600] Determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table. The third MCS index table includes the MCS elements in the MCS index table used for the initial transmission of Msg3 and the MCS elements in the second MCS index table. The MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table includes only the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3.

[0601] In some embodiments, the first determination module is specifically configured to:

[0602] Determine the highest bit or the lowest bit of the X-bit used to indicate the MCS in the DCI;

[0603] Determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X - 1 bits of the X-bit except the highest bit or the lowest bit. The fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3 or the second MCS index table. When the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used for the initial transmission of Msg3. When the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table. Each row in the second MCS index table includes only the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3;

[0604] Determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0605] In some embodiments, the first determination module is specifically configured to:

[0606] Determine the X-bit used to indicate the MCS in the DCI;

[0607] Determine the first MCS index according to the X-bit;

[0608] Determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table. The fifth MCS index table is formed by merging some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table. The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table includes only the modulation order, and the TBS for Msg3 retransmission is the TBS for the initial transmission of Msg3. The some MCS elements in the first MCS index table that make up the fifth MCS index table are associated with the MCS used for the initial transmission of Msg3.

[0609] In some embodiments, the X-bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

[0610] In some embodiments, the first determination module is specifically configured to:

[0611] Determine that the modulation order of the MCS at Msg3 retransmission is a preset value M.

[0612] In some embodiments, the value of M is 2.

[0613] In some embodiments, the first determination module is specifically configured to:

[0614] Determine that the modulation order of the MCS at Msg3 retransmission is the modulation order of the MCS used at Msg3 initial transmission.

[0615] In some embodiments, the first determination module is specifically configured to:

[0616] Determine that the candidate MCS used at Msg3 initial transmission is the default value, or determine that the modulation orders of the candidate MCSs used at Msg_{3} initial transmission do not exceed P;

[0617] Determine the modulation order corresponding to the MCS at Msg3 retransmission as N in a predefined manner.

[0618] In some embodiments, the value of N is q or 2.

[0619] In some embodiments, the first determination module is specifically configured to:

[0620] Determine that the candidate MCS used at Msg3 initial transmission is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used at Msg3 initial transmission exceeds P;

[0621] Determine the MCS at Msg3 retransmission through the bits for indicating the MCS in the DCI.

[0622] In some embodiments, the value of P is 2.

[0623] Specifically, the above Msg3 sending device provided by the embodiments of the present application can implement all the method steps implemented by the method embodiments with the execution subject being a terminal, and can achieve the same technical effects. The same or corresponding parts and beneficial effects in this embodiment as those in the method embodiments will not be specifically described herein.

[0624] Figure 6 It is a schematic structural diagram of a Msg3 receiving device provided by the embodiments of the present application, as Figure 6As shown in the figure, an embodiment of the present application provides a Msg3 receiving device, including a second sending module 601 and a second receiving module 602, where:

[0625] The second sending module 601 is configured to send DCI for scheduling Msg3 retransmission to the terminal; the second receiving module 602 is configured to receive the Msg3 retransmission sent by the terminal, and the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by the bits for indicating MCS in the DCI, and the number of bits for indicating MCS is less than 5; and / or, the MCS of the Msg3 retransmission is predefined.

[0626] In some embodiments, the second sending module is specifically configured to:

[0627] Update the high 2-bit values of the MCS indication field in the DCI to 1 to obtain new 5-bit bits indicated by the MCS indication field; the bits for indicating MCS in the DCI are the low 3-bit bits in the MCS indication field of the DCI;

[0628] Determine a first MCS index according to the new 5-bit bits indicated by the MCS indication field;

[0629] Determine the MCS for Msg3 retransmission according to the first MCS index and a first MCS index table.

[0630] In some embodiments, the second sending module is specifically configured to:

[0631] Determine X-bit bits for indicating MCS in the DCI;

[0632] Use the X-bit bits as low-order bits and bits with 5-X bit values all being 1 as high-order bits to generate new 5-bit bits;

[0633] Determine a first MCS index according to the new 5-bit bits;

[0634] Determine the MCS for Msg3 retransmission according to the first MCS index and a first MCS index table.

[0635] In some embodiments, the second sending module is specifically configured to:

[0636] Determine X-bit bits for indicating MCS in the DCI;

[0637] Determine a second MCS index according to the X-bit bits, and an offset of the MCS index;

[0638] Determine a first MCS index according to the second MCS index and the offset;

[0639] Determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table.

[0640] In some embodiments, the offset is (32 - 2^X).

[0641] In some embodiments, the second sending module is specifically configured to:

[0642] Determine the X-bit in the DCI for indicating the MCS;

[0643] Determine the first MCS index according to the X-bit;

[0644] Determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table, each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit.

[0645] In some embodiments, the X-bit is the high X-bit or the low X-bit in the MCS indication field in the DCI.

[0646] In some embodiments, the value of X is 2 or 3.

[0647] In some embodiments, the second sending module is specifically configured to:

[0648] Determine the X-bit in the DCI for indicating the MCS;

[0649] Determine the first MCS index according to the X-bit;

[0650] Determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table, the third MCS index table contains the MCS elements in the MCS index table adopted during Msg3 initial transmission and the MCS elements in the second MCS index table, the MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit, each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission.

[0651] In some embodiments, the second sending module is specifically configured to:

[0652] Determine the highest bit or the lowest bit of the X-bit in the DCI for indicating the MCS;

[0653] Determine a fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine a first MCS index according to the X-1 bits of the X-bit except the highest bit or the lowest bit; the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3 or the second MCS index table, and when the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3, and when the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission;

[0654] Determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table.

[0655] In some embodiments, the second sending module is specifically configured to:

[0656] Determine the X-bit in the DCI for indicating the MCS;

[0657] Determine a first MCS index according to the X-bit;

[0658] Determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table. The fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table. The MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit. Each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; the part of the MCS elements in the first MCS index table that constitutes the fifth MCS index table is associated with the MCS used in the initial transmission of Msg3.

[0659] In some embodiments, the X-bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

[0660] In some embodiments, the second sending module is specifically configured to:

[0661] Determine that the modulation order of the MCS for Msg3 retransmission is a preset value M.

[0662] In some embodiments, the value of M is 2.

[0663] In some embodiments, the second sending module is specifically configured to:

[0664] Determine that the modulation order of the MCS when Msg3 is retransmitted is the modulation order of the MCS used when Msg3 is initially transmitted.

[0665] In some embodiments, the second sending module is specifically configured to:

[0666] Determine that the candidate MCS used when Msg3 is initially transmitted is the default value, or determine that the modulation order of the candidate MCSs used when Msg3 is initially transmitted does not exceed P;

[0667] Determine the modulation order corresponding to the MCS when Msg3 is retransmitted as N in a predefined manner.

[0668] In some embodiments, the value of N is q or 2.

[0669] In some embodiments, the second sending module is specifically configured to:

[0670] Determine that the candidate MCS used when Msg3 is initially transmitted is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used when Msg3 is initially transmitted exceeds P;

[0671] Indicate the MCS when Msg3 is retransmitted through the bits in the DCI for indicating the MCS.

[0672] In some embodiments, the value of P is 2.

[0673] Specifically, the above Msg3 receiving device provided by the embodiments of the present application can implement all the method steps implemented by the method embodiments with the execution subject being a network-side device, and can achieve the same technical effects. The same or corresponding parts and beneficial effects in this embodiment as those in the method embodiments will not be specifically described herein.

[0674] It should be noted that the division of units / modules in the above embodiments of the present application is schematic, merely a logical function division, and there may be other division methods in actual implementation. In addition, in each embodiment of the present application, each functional unit may be integrated into a processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above integrated units may be implemented in the form of hardware or in the form of software functional units.

[0675] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0676] In some embodiments, there is also provided a processor-readable storage medium. The processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the methods provided in the above-mentioned various embodiments, including:

[0677] Receiving the DCI for scheduling the retransmission of Msg3 sent by a network-side device; in the case of determining that the number of bits used to indicate the MCS in the DCI is less than 5 bits, determining the MCS for Msg3 retransmission through the bits used to indicate the MCS in the DCI; and / or determining the MCS for Msg3 retransmission in a predefined manner; and sending the Msg3 retransmission according to the determined MCS for Msg3 retransmission.

[0678] Or it includes:

[0679] Sending the DCI for scheduling the retransmission of Msg3 to a terminal; receiving the Msg3 retransmission sent by the terminal, where the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by the bits used to indicate the MCS in the DCI, and the number of bits used to indicate the MCS is less than 5; and / or the MCS of the Msg3 retransmission is predefined.

[0680] It should be noted that: the processor-readable storage medium can be any available medium or data storage device accessible by the processor, including but not limited to magnetic memories (such as floppy disks, hard disks, magnetic tapes, magneto-optical discs (MO), etc.), optical memories (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor memories (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drives (SSD)), etc.

[0681] In addition, it should be noted that in the embodiments of the present application, the terms "first", "second", etc. are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0682] In the embodiments of the present application, the term "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0683] In the embodiments of the present application, the term "plurality" means two or more, and other quantifiers are similar.

[0684] The technical solutions provided in the embodiments of the present application can be applied to a variety of systems, especially 5G systems. For example, the applicable systems can be global system of mobile communication (GSM) systems, code division multiple access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) general packet radio service (GPRS) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, long term evolution advanced (LTE-A) systems, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) systems, 5G New Radio (NR) systems, etc. Both terminal devices and network devices are included in these various systems. The core network part can also be included in the system, such as the Evolved Packet System (EPS), 5G System (5GS), etc.

[0685] The terminal device involved in the embodiments of the present application can be a device that provides voice and / or data connectivity to users, such as a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem, etc. In different systems, the name of the terminal device may also be different. For example, in a 5G system, the terminal device can be called a user equipment (UE). The wireless terminal device can communicate with one or more core networks (CNs) via a radio access network (RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal device. For example, it can be a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device that exchanges language and / or data with the radio access network. For example, devices such as personal communication service (PCS) phones, cordless phones, session initiated protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), etc. The wireless terminal device can also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, an access point, a remote terminal device, an access terminal device, a user terminal device, a user agent, a user device, which is not limited in the embodiments of the present application.

[0686] The network device involved in the embodiments of this application can be a base station, which may include multiple cells that provide services to terminals. Depending on specific application scenarios, the base station can also be referred to as an access point, or it can be a device in the access network that communicates with wireless terminal devices through one or more sectors over the air interface, or other names. The network device can be used to mutually replace the received air frames and Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device can also coordinate the management of the attributes of the air interface. For example, the network device involved in the embodiments of this application can be a network device (Base Transceiver Station, BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), or it can be a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or it can also be an evolved network device (evolutional Node B, eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), or it can be a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc. The embodiments of this application do not limit this. In some network architectures, the network device can include a centralized unit (centralized unit, CU) node and a distributed unit (distributed unit, DU) node, and the centralized unit and the distributed unit can also be geographically separated.

[0687] A network device and a terminal device can each use one or more antennas for Multi-Input Multi-Output (MIMO) transmission. The MIMO transmission can be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). According to the form and quantity of the root antenna combination, the MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, and can also be diversity transmission, precoding transmission, beamforming transmission, etc.

[0688] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0689] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0690] These processor-executable instructions can also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the processor-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0691] These processor-executable instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide for implementing the functions in the process Figure 1One or more processes and / or blocks Figure 1 Steps of functions specified in one or more blocks.

[0692] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

1. A method for sending Msg3, characterized in that including: receiving DCI for scheduling Msg3 retransmission sent by a network - side device; when it is determined that the number of bits for indicating MCS in the DCI is less than 5 bits, determining the MCS for Msg3 retransmission by the bits for indicating MCS in the DCI, or determining the MCS for Msg3 retransmission by the bits for indicating MCS in the DCI and a predefined method; sending Msg3 retransmission according to the determined MCS for Msg3 retransmission; The determining the MCS for Msg3 retransmission by the bits for indicating MCS in the DCI includes any of the following: updating both the high 2 - bit values of the MCS indication field in the DCI to 1 to obtain a new 5 - bit value indicated by the MCS indication field; the bits for indicating MCS in the DCI are the low 3 - bit bits in the MCS indication field of the DCI; determining a first MCS index according to the new 5 - bit value indicated by the MCS indication field; determining the MCS for Msg3 retransmission according to the first MCS index and a first MCS index table; or, determining X bits for indicating MCS in the DCI; using the X - bit bits as low - order bits and bits with 5 - X bit values all being 1 as high - order bits to generate a new 5 - bit value; determining a first MCS index according to the new 5 - bit value; determining the MCS for Msg3 retransmission according to the first MCS index and a first MCS index table; or, determining X bits for indicating MCS in the DCI; determining a second MCS index and an offset of the MCS index according to the X - bit bits; determining a first MCS index according to the second MCS index and the offset; determining the MCS for Msg3 retransmission according to the first MCS index and a first MCS index table; or, determining X bits for indicating MCS in the DCI; determining a first MCS index according to the X - bit bits; determining the MCS for Msg3 retransmission according to the first MCS index and a second MCS index table, where each row in the second MCS index table only includes modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X - bit bits; or, determining X bits for indicating MCS in the DCI; determining a first MCS index according to the X - bit bits; determining the MCS for Msg3 retransmission according to the first MCS index and a third MCS index table, where the third MCS index table contains MCS elements in the MCS index table adopted during Msg3 initial transmission and MCS elements in the second MCS index table, the MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X - bit bits, each row in the second MCS index table only includes modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; Determine the highest bit or the lowest bit of the X-bit used to indicate the MCS in the DCI; determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X-1 bits of the X-bit except the highest bit or the lowest bit; the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3 or the second MCS index table, and when the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3, and when the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table; or, Determine the X-bit used to indicate the MCS in the DCI; determine the first MCS index according to the X-bit; determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table, the fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table, the MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit, each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; the part of the MCS elements in the first MCS index table that constitutes the fifth MCS index table is associated with the MCS used in the initial transmission of Msg3; Determining the MCS for Msg3 retransmission through the bit used to indicate the MCS in the DCI and a predefined method includes any of the following: Determine that the candidate MCS used in the initial transmission of Msg3 is the default value, or determine that the modulation orders of the candidate MCSs used in the initial transmission of Msg3 do not exceed P; determine the modulation order corresponding to the MCS for Msg3 retransmission as N through a predefined method; or, Determine that the candidate MCS used in the initial transmission of Msg3 is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used in the initial transmission of Msg3 exceeds P; determine the MCS for Msg3 retransmission through the bit used to indicate the MCS in the DCI.

2. The Msg3 sending method according to claim 1, characterized in that, The offset is (32 - 2^X).

3. The Msg3 sending method according to claim 1 or 2, characterized in that The X-bit is the upper X-bit or the lower X-bit in the MCS indication field in the DCI.

4. The Msg3 sending method according to claim 3, wherein The value of X is 2 or 3.

5. The Msg3 sending method according to claim 1, wherein The X-bit is the upper 3 bits or the lower 3 bits in the MCS indication field in the DCI.

6. The Msg3 sending method according to claim 1, wherein The value of N is q or 2.

7. The Msg3 sending method according to claim 1 or 6, characterized in that, The value of P is 2.

8. A Msg3 receiving method, characterized in that, Include: Send a DCI scheduling Msg3 retransmission to the terminal; Receive the Msg3 retransmission sent by the terminal, where the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by the bit for indicating MCS in the DCI, or is indicated by the bit for indicating MCS in the DCI and a predefined manner, and the number of bits for indicating MCS in the DCI is less than 5; When indicating the MCS during Msg3 retransmission through the bit for indicating MCS in the DCI, it includes any one of the following: Update the high 2 bits of the MCS indication field in the DCI to 1 to obtain a new 5-bit value indicated by the MCS indication field; the bit for indicating MCS in the DCI is the low 3 bits in the MCS indication field of the DCI; determine the first MCS index according to the new 5-bit value indicated by the MCS indication field; determine the MCS during Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X-bit value for indicating MCS in the DCI; use the X-bit value as the low-order bits and use bits with a 5-X-bit value of 1 as the high-order bits to generate a new 5-bit value; determine the first MCS index according to the new 5-bit value; determine the MCS during Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X-bit value for indicating MCS in the DCI; determine the second MCS index and the offset of the MCS index according to the X-bit value; determine the first MCS index according to the second MCS index and the offset; determine the MCS during Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X-bit value for indicating MCS in the DCI; determine the first MCS index according to the X-bit value; determine the MCS during Msg3 retransmission according to the first MCS index and the second MCS index table, where each row in the second MCS index table only includes the modulation order, and the TBS of the Msg3 retransmission is the TBS of the initial transmission of Msg3, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit value; or, Determine the X-bit value for indicating MCS in the DCI; determine the first MCS index according to the X-bit value; determine the MCS during Msg3 retransmission according to the first MCS index and the third MCS index table, where the third MCS index table includes the MCS elements in the MCS index table used during the initial transmission of Msg3 and the MCS elements in the second MCS index table, the MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit value, each row in the second MCS index table only includes the modulation order, and the TBS of the Msg3 retransmission is the TBS of the initial transmission of Msg3; or, Determine the highest bit or the lowest bit of the X-bit in the DCI for indicating the MCS; determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X-1 bits in the X-bit except the highest bit or the lowest bit; the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3 or the second MCS index table, and when the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3, and when the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table; or, Determine the X-bit in the DCI for indicating the MCS; determine the first MCS index according to the X-bit; determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table, the fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table, the MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit, each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; the some MCS elements in the first MCS index table that make up the fifth MCS index table are associated with the MCS used in the initial transmission of Msg3; Indicate the MCS for Msg3 retransmission through the bit for indicating the MCS in the DCI and a predefined manner, including any one of the following: Determine that the candidate MCS used in the initial transmission of Msg3 is the default value, or determine that the modulation orders of the candidate MCSs used in the initial transmission of Msg3 do not exceed P; determine the modulation order corresponding to the MCS for Msg3 retransmission as N through a predefined manner; or, Determine that the candidate MCS used in the initial transmission of Msg3 is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used in the initial transmission of Msg3 exceeds P; indicate the MCS for Msg3 retransmission through the bit for indicating the MCS in the DCI.

9. The Msg3 receiving method according to claim 8, wherein The offset is (32 - 2^X).

10. The Msg3 receiving method according to claim 8 or 9, characterized in that, The X-bit is the high X-bit or the low X-bit in the MCS indication field in the DCI.

11. The Msg3 receiving method according to claim 10, wherein The value of X is 2 or 3.

12. The Msg3 receiving method according to claim 8, wherein The X-bit is the high 3-bit or the low 3-bit in the MCS indication field in the DCI.

13. The Msg3 receiving method according to claim 8, wherein The value of N is q or 2.

14. The Msg3 receiving method according to claim 8 or 13, characterized in that, The value of P is 2.

15. A terminal, characterized in that, Including a memory, a transceiver, and a processor; The memory is used to store computer programs; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: Receive the DCI for scheduling the retransmission of Msg3 sent by the network side device; When it is determined that the number of bits for indicating MCS in the DCI is less than 5 bits, determine the MCS for Msg3 retransmission through the bits for indicating MCS in the DCI, or determine the MCS for Msg3 retransmission through the bits for indicating MCS in the DCI and a predefined method; Send the retransmission of Msg3 according to the determined MCS for Msg3 retransmission; The determining the MCS for Msg3 retransmission through the bits for indicating MCS in the DCI includes any of the following: Update the high 2-bit values of the MCS indication field in the DCI to 1 to obtain the new 5-bit bits indicated by the MCS indication field; the bits for indicating MCS in the DCI are the low 3-bit bits in the MCS indication field of the DCI; determine the first MCS index according to the new 5-bit bits indicated by the MCS indication field; determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X-bit bits for indicating MCS in the DCI; use the X-bit bits as the low-order bits and the bits with 5-X bits all being 1 as the high-order bits to generate new 5-bit bits; determine the first MCS index according to the new 5-bit bits; determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X-bit bits for indicating MCS in the DCI; determine the second MCS index and the offset of the MCS index according to the X-bit bits; determine the first MCS index according to the second MCS index and the offset; determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X-bit bits for indicating MCS in the DCI; determine the first MCS index according to the X-bit bits; determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table, each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit bits; or, Determine the X-bit bits for indicating MCS in the DCI; determine the first MCS index according to the X-bit bits; determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table, the third MCS index table contains the MCS elements in the MCS index table used in Msg3 initial transmission and the MCS elements in the second MCS index table, the MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit bits, each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; Determine the highest bit or the lowest bit of the X-bit in the DCI for indicating the MCS; determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X-1 bits in the X-bit except the highest bit or the lowest bit; the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3 or the second MCS index table, and when the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3, and when the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table; or, Determine the X-bit in the DCI for indicating the MCS; determine the first MCS index according to the X-bit; determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table, the fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table, the MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit, each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; the part of the MCS elements in the first MCS index table that constitutes the fifth MCS index table is associated with the MCS used in the initial transmission of Msg3; Determining the MCS for Msg3 retransmission by the bits in the DCI for indicating the MCS and a predefined manner includes any one of the following: Determine that the candidate MCS used in the initial transmission of Msg3 is the default value, or determine that the modulation orders of the candidate MCSs used in the initial transmission of Msg3 do not exceed P; determine the modulation order corresponding to the MCS for Msg3 retransmission as N through a predefined manner; or, Determine that the candidate MCS used in the initial transmission of Msg3 is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used in the initial transmission of Msg3 exceeds P; determine the MCS for Msg3 retransmission by the bits in the DCI for indicating the MCS.

16. The terminal according to claim 15, wherein The offset is (32 - 2^X).

17. The terminal according to claim 15 or 16, characterized in that, The X-bit is the high-order X-bit or the low-order X-bit in the MCS indication field in the DCI.

18. The terminal according to claim 17, wherein The value of X is 2 or 3.

19. The terminal according to claim 15, wherein, The X-bit is the high-order 3-bit or the low-order 3-bit in the MCS indication field in the DCI.

20. The terminal according to claim 15, wherein The value of N is q or 2.

21. The terminal according to claim 15 or 20, characterized in that, The value of P is 2.

22. A network-side device, characterized in that, Including a memory, a transceiver, and a processor; The memory is used to store computer programs; The transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: Send DCI for scheduling Msg3 retransmission to the terminal; Receive the Msg3 retransmission sent by the terminal, where the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by the bits for indicating MCS in the DCI, or is indicated by the bits for indicating MCS in the DCI and a predefined manner, and the number of bits for indicating MCS is less than 5; Indicate the MCS at the time of Msg3 retransmission through the bits for indicating MCS in the DCI, including any one of the following: Update both the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit value indicated by the MCS indication field; the bits for indicating MCS in the DCI are the low 3 bits in the MCS indication field of the DCI; determine the first MCS index according to the new 5-bit value indicated by the MCS indication field; determine the MCS at the time of Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X bits for indicating MCS in the DCI; use the X bits as the low bits, and use bits with 5 - X bits all being 1 as the high bits to generate a new 5-bit value; determine the first MCS index according to the new 5-bit value; determine the MCS at the time of Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X bits for indicating MCS in the DCI; determine the second MCS index and the offset of the MCS index according to the X bits; determine the first MCS index according to the second MCS index and the offset; determine the MCS at the time of Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X bits for indicating MCS in the DCI; determine the first MCS index according to the X bits; determine the MCS at the time of Msg3 retransmission according to the first MCS index and the second MCS index table, where each row in the second MCS index table only includes the modulation order, and the TBS of the Msg3 retransmission is the TBS of the Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X bits; or, Determine the X bits for indicating MCS in the DCI; determine the first MCS index according to the X bits; determine the MCS at the time of Msg3 retransmission according to the first MCS index and the third MCS index table, where the third MCS index table contains the MCS elements in the MCS index table used at the time of Msg3 initial transmission and the MCS elements in the second MCS index table, the MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X bits, each row in the second MCS index table only includes the modulation order, and the TBS of the Msg3 retransmission is the TBS of the Msg3 initial transmission; or, Determine the highest bit or the lowest bit of the X-bit in the DCI for indicating the MCS; determine the fourth MCS index table according to the highest bit or the lowest bit of the X-bit, and determine the first MCS index according to the X-1 bits in the X-bit except the highest bit or the lowest bit; the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3 or the second MCS index table, and when the highest bit or the lowest bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3, and when the highest bit or the lowest bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table; or, Determine the X-bit in the DCI for indicating the MCS; determine the first MCS index according to the X-bit; determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table, where the fifth MCS index table is formed by merging some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table, and the MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit, and each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; the part of the MCS elements in the first MCS index table that constitutes the fifth MCS index table is associated with the MCS used in the initial transmission of Msg3; Indicate the MCS for Msg3 retransmission through the bit for indicating the MCS in the DCI and a predefined manner, including any one of the following: Determine that the candidate MCS used in the initial transmission of Msg3 is the default value, or determine that the modulation orders of the candidate MCSs used in the initial transmission of Msg3 do not exceed P; determine the modulation order corresponding to the MCS for Msg3 retransmission as N through a predefined manner; or, Determine that the candidate MCS used in the initial transmission of Msg3 is configured by SIB1, or at least one of the modulation orders of the candidate MCSs used in the initial transmission of Msg3 exceeds P; indicate the MCS for Msg3 retransmission through the bit for indicating the MCS in the DCI.

23. The network-side device according to claim 22, wherein The offset is (32 - 2^X).

24. The network-side device according to claim 22 or 23, characterized in that, The X-bit is the high-order X-bit or the low-order X-bit in the MCS indication field in the DCI.

25. The network-side device according to claim 24, wherein The value of X is 2 or 3.

26. The network-side device according to claim 22, wherein The X-bit is the high-order 3 bits or the low-order 3 bits in the MCS indication field in the DCI.

27. The network-side device according to claim 22, wherein The value of N is q or 2.

28. The network-side device according to claim 22 or 27, characterized in that The value of P is 2.

29. A Msg3 sending device, characterized in that, Include: A first receiving module, configured to receive the DCI for scheduling Msg3 retransmission sent by the network-side device; A first determination module, configured to, when determining that the number of bits for indicating the MCS in the DCI is less than 5 bits, determine the MCS for Msg3 retransmission through the bits for indicating the MCS in the DCI, or determine the MCS for Msg3 retransmission through the bits for indicating the MCS in the DCI and a predefined manner; A first sending module, configured to send a Msg3 retransmission according to the determined MCS for Msg3 retransmission; The determining the MCS for Msg3 retransmission through the bits for indicating the MCS in the DCI includes any one of the following: Updating both the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit value indicated by the MCS indication field; the bits for indicating the MCS in the DCI are the low 3 bits in the MCS indication field of the DCI; determining a first MCS index according to the new 5-bit value indicated by the MCS indication field; and determining the MCS for Msg3 retransmission according to the first MCS index and a first MCS index table; or, Determining X bits for indicating the MCS in the DCI; using the X bits as low-order bits and using bits with 5-X bit values all being 1 as high-order bits to generate a new 5-bit value; determining a first MCS index according to the new 5-bit value; and determining the MCS for Msg3 retransmission according to the first MCS index and a first MCS index table; or, Determining X bits for indicating the MCS in the DCI; determining a second MCS index and an offset of the MCS index according to the X bits; determining a first MCS index according to the second MCS index and the offset; and determining the MCS for Msg3 retransmission according to the first MCS index and a first MCS index table; or, Determining X bits for indicating the MCS in the DCI; determining a first MCS index according to the X bits; determining the MCS for Msg3 retransmission according to the first MCS index and a second MCS index table, where each row in the second MCS index table only includes a modulation order, and the TBS of the Msg3 retransmission is the TBS of the Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X bits; or, Determining X bits for indicating the MCS in the DCI; determining a first MCS index according to the X bits; determining the MCS for Msg3 retransmission according to the first MCS index and a third MCS index table, where the third MCS index table includes MCS elements in the MCS index table adopted during the Msg3 initial transmission and MCS elements in the second MCS index table, the MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X bits, each row in the second MCS index table only includes a modulation order, and the TBS of the Msg3 retransmission is the TBS of the Msg3 initial transmission; or, Determine the most significant bit or the least significant bit of the X-bit used to indicate the MCS in the DCI; determine the fourth MCS index table according to the most significant bit or the least significant bit of the X-bit, and determine the first MCS index according to the X-1 bits of the X-bit except the most significant bit or the least significant bit; the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3 or the second MCS index table, and when the most significant bit or the least significant bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3, and when the most significant bit or the least significant bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table; or, Determine the X-bit used to indicate the MCS in the DCI; determine the first MCS index according to the X-bit; determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table, the fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table, the MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit, each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; the some MCS elements in the first MCS index table that make up the fifth MCS index table are associated with the MCS used in the initial transmission of Msg3; Determining the MCS for Msg3 retransmission by the bit used to indicate the MCS in the DCI and a predefined manner includes any of the following: Determine that the candidate MCS used in the initial transmission of Msg3 is the default value, or determine that the modulation orders of the candidate MCSs used in the initial transmission of Msg3 do not exceed P; determine the modulation order corresponding to the MCS for Msg3 retransmission as N by a predefined manner; or, Determine that the candidate MCS used in the initial transmission of Msg3 is configured by SIB1, or at least one of the candidate MCSs used in the initial transmission of Msg3 has a modulation order exceeding P; determine the MCS for Msg3 retransmission by the bit used to indicate the MCS in the DCI.

30. A Msg3 receiving device, characterized in that, Include: A second sending module, configured to send a DCI for scheduling Msg3 retransmission to the terminal; A second receiving module, configured to receive the Msg3 retransmission sent by the terminal, where the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by the bit used to indicate the MCS in the DCI, or is indicated by the bit used to indicate the MCS in the DCI and a predefined manner, and the number of bits used to indicate the MCS is less than 5; When retransmitting Msg3, the MCS is indicated by the bit used to indicate the MCS in the DCI, including any one of the following: Update the high 2-bit values of the MCS indication field in the DCI to 1 to obtain a new 5-bit value indicated by the MCS indication field; the bit used to indicate the MCS in the DCI is the low 3-bit values in the MCS indication field of the DCI; determine a first MCS index according to the new 5-bit value indicated by the MCS indication field; determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X-bit values used to indicate the MCS in the DCI; use the X-bit values as the low-bit values and use 5-X-bit values all being 1 as the high-bit values to generate a new 5-bit value; determine a first MCS index according to the new 5-bit value; determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X-bit values used to indicate the MCS in the DCI; determine a second MCS index and an offset of the MCS index according to the X-bit values; determine a first MCS index according to the second MCS index and the offset; determine the MCS for Msg3 retransmission according to the first MCS index and the first MCS index table; or, Determine the X-bit values used to indicate the MCS in the DCI; determine a first MCS index according to the X-bit values; determine the MCS for Msg3 retransmission according to the first MCS index and the second MCS index table, each row in the second MCS index table only includes modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission, and the MCS index in the second MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit values; or, Determine the X-bit values used to indicate the MCS in the DCI; determine a first MCS index according to the X-bit values; determine the MCS for Msg3 retransmission according to the first MCS index and the third MCS index table, the third MCS index table contains the MCS elements in the MCS index table used for Msg3 initial transmission and the MCS elements in the second MCS index table, the MCS index in the third MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit values, each row in the second MCS index table only includes modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; or, Determine the most significant bit or the least significant bit of the X-bit used to indicate MCS in the DCI; determine the fourth MCS index table according to the most significant bit or the least significant bit of the X-bit, and determine the first MCS index according to the X-1 bits of the X-bit except the most significant bit or the least significant bit; the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3 or the second MCS index table, and when the most significant bit or the least significant bit is 0 or 1, it indicates that the fourth MCS index table is the same as the MCS index table used in the initial transmission of Msg3, and when the most significant bit or the least significant bit is 1 or 0, it indicates that the fourth MCS index table is the same as the second MCS index table; each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; determine the MCS for Msg3 retransmission according to the first MCS index and the fourth MCS index table; or, Determine the X-bit used to indicate MCS in the DCI; determine the first MCS index according to the X-bit; determine the MCS for Msg3 retransmission according to the first MCS index and the fifth MCS index table, the fifth MCS index table is formed by combining some MCS elements in the first MCS index table and some or all MCS elements in the second MCS index table, the MCS index in the fifth MCS index table corresponds to the MCS index corresponding to the candidate MCS indicated by the X-bit, each row in the second MCS index table only includes the modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 initial transmission; the part of the MCS elements in the first MCS index table that make up the fifth MCS index table is associated with the MCS used in the initial transmission of Msg3; Indicate the MCS for Msg3 retransmission through the bit used to indicate MCS in the DCI and a predefined method, including any one of the following: Determine that the candidate MCS used in the initial transmission of Msg3 is the default value, or determine that the modulation orders of the candidate MCSs used in the initial transmission of Msg3 do not exceed P; determine the modulation order corresponding to the MCS for Msg3 retransmission as N through a predefined method; or, Determine that the candidate MCS used in the initial transmission of Msg3 is configured by SIB1, or at least one MCS among the candidate MCSs used in the initial transmission of Msg3 has a modulation order exceeding P; indicate the MCS for Msg3 retransmission through the bit used to indicate MCS in the DCI.

31. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and the computer program is used to cause a computer to execute the Msg3 sending method according to any one of claims 1 to 7, or execute the Msg3 receiving method according to any one of claims 8 to 14.

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