CN116318563A

CN116318563A - Msg3 transmitting method, receiving method, device and storage medium

Info

Publication number: CN116318563A
Application number: CN202111555149.2A
Authority: CN
Inventors: 沈姝伶; 费永强; 高雪娟
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2023-06-23

Abstract

The embodiment of the application provides an Msg3 sending method, an Msg3 receiving method, an Msg3 sending device and a storage medium, wherein the Msg3 sending comprises: receiving DCI which is sent by network side equipment and is used for scheduling Msg3 retransmission; determining the MCS at the time of Msg3 retransmission by the bit used for indicating the MCS in the DCI under the condition that the bit number used for indicating the MCS in the DCI is less than 5 bits; and/or determining the MCS at the time of Msg3 retransmission by a predefined manner; and sending the Msg3 retransmission according to the determined MCS at the time of the Msg3 retransmission. According to the Msg3 sending method, the Msg3 receiving method, the Msg3 sending device and the storage medium, through explicit indication and/or a predefined mode, the terminal can determine the modulation order and/or the coding rate corresponding to the MCS adopted in Msg3 retransmission, the MCS used in Msg3 retransmission can be ensured to meet the TBS requirement of retransmission, and the reliability of uplink access is improved.

Description

Msg3 transmitting method, receiving method, device and storage medium

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and a device for sending and receiving a Message3 (Msg 3) and a storage medium.

Background

In the prior art, a modulation and coding strategy (Modulation and Coding Scheme, MCS) indication field (abbreviated as "MCS field") in downlink control information (Downlink Control Information, DCI) for scheduling Msg3 retransmission is separated by 2 bits (bits) to indicate the number of repeated transmission times during Msg3 retransmission. At this time, only 3 bits of MCS field in the scheduling DCI are available, the MCS index dedicated for retransmission in the MCS index table in the existing protocol is 28-31, and the 3-bit MCS field cannot be indicated correspondingly, so that Msg3 retransmission may occur, and MCS meeting the retransmission requirement cannot be selected. Therefore, a new scheme for indicating the MCS used in Msg3 retransmission needs to be designed.

Disclosure of Invention

The embodiment of the application provides a transmission method, a receiving method, a device and a storage medium for Msg3, which are used for solving the technical problem that the MCS meeting the retransmission requirement cannot be selected when Msg3 is retransmitted in the prior art.

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

receiving DCI which is sent by network side equipment and is used for scheduling Msg3 retransmission;

determining the MCS at the time of Msg3 retransmission by the bit used for indicating the MCS in the DCI under the condition that the bit number used for indicating the MCS in the DCI is less than 5 bits; and/or determining the MCS at the time of Msg3 retransmission by a predefined manner;

And sending the Msg3 retransmission according to the determined MCS at the time of the Msg3 retransmission.

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

updating the high 2-bit value of the MCS indication domain in the DCI to 1 to obtain a new 5-bit indicated by the MCS indication domain; bits in the DCI for indicating MCS are low 3 bits in an MCS indication field in the DCI;

determining a first MCS index according to the new 5 bits indicated by the MCS indication field;

and determining the MCS during Msg3 retransmission according to the first MCS index and the first MCS index table.

determining an X bit used for indicating MCS in the DCI;

taking the X bit as a low bit and taking the bits with the 5-X bit values of 1 as high bits to generate new 5 bits;

determining a first MCS index according to the new 5 bits;

determining an X bit used for indicating 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;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining the MCS when the Msg3 is retransmitted according to the first MCS index and a second MCS index table, wherein each row in the second MCS index table only comprises modulation order, the TBS retransmitted by the Msg3 is the TBS originally transmitted by the 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.

In some embodiments, the X-bit is an upper X-bit or a lower X-bit in an MCS indication field in the DCI.

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

Determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining the MCS of the Msg3 retransmission according to the first MCS index and a third MCS index table, wherein the third MCS index table contains MCS elements in an MCS index table adopted by the Msg3 in the 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, each row in the second MCS index table only comprises modulation order, and the TBS of the Msg3 retransmission is the TBS of the Msg3 in the initial transmission.

determining the most significant bit or the least significant bit of X bits used for indicating MCS in the DCI;

determining a fourth MCS index table according to the highest bit or the lowest bit of the X bits, and determining a first MCS index according to the X-1 bit of the X bits divided by the highest bit or the lowest bit; the fourth MCS index table is identical to the MCS index table or the second MCS index table adopted in the primary transmission of Msg3, the highest bit or the lowest bit represents that the fourth MCS index table is identical to the MCS index table adopted in the primary transmission of Msg3 when the highest bit or the lowest bit is 0 or 1, and the highest bit or the lowest bit represents that the fourth MCS index table is identical to the second MCS index table when the highest bit or the lowest bit is 1 or 0; each row in the second MCS index table only comprises modulation order, and the TBS retransmitted by Msg3 is the TBS initially transmitted by Msg 3;

And determining the MCS during Msg3 retransmission according to the first MCS index and the fourth MCS index table.

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining the MCS of the Msg3 retransmission according to the first MCS index and a fifth MCS index table, wherein the fifth MCS index table comprises a part of MCS elements in the first MCS index table and a part or all of MCS elements in a 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 comprises modulation order, and the TBS of the Msg3 retransmission is the TBS of the Msg3 primary transmission; a partial MCS element in the first MCS index table constituting the fifth MCS index table is associated with an MCS employed for the Msg3 initial transmission.

In some embodiments, the X-bit is a high order 3 bits or a low order 3 bits in an MCS indication field in the DCI.

In some embodiments, determining the MCS at the time of Msg3 retransmission by a predefined manner includes:

and determining the modulation order of the MCS at the time of Msg3 retransmission as a preset value M.

In some embodiments, the value of M is 2.

the modulation order of the MCS at the time of Msg3 retransmission is determined to be the modulation order of the MCS adopted at the time of Msg3 initial transmission.

In some embodiments, determining the MCS at the time of Msg3 retransmission by the bits in the DCI for indicating the MCS and a predefined manner includes:

determining the candidate MCS adopted in the initial transmission of the Msg3 as a default value, or determining that the modulation order number of the candidate MCS adopted in the initial transmission of the Msg3 is not more than P;

and determining that the modulation order corresponding to the MCS when the Msg3 is retransmitted is N in a predefined mode.

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

determining that the candidate MCS adopted in the initial transmission of the Msg3 is configured by SIB1, or that the modulation order of at least one MCS in the candidate MCS adopted in the initial transmission of the Msg3 exceeds P;

and determining the MCS at the time of Msg3 retransmission by using the bit used for indicating the MCS in the DCI.

In some embodiments, P has a value of 2.

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

Transmitting DCI for scheduling Msg3 retransmission to the terminal;

receiving Msg3 retransmission sent by the terminal, wherein the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by a bit for indicating MCS in the DCI, and the bit number for indicating MCS is less than 5; and/or, the MCS of the Msg3 retransmission is predefined.

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the second MCS index and the offset;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

In some embodiments, predefining the MCS at the Msg3 retransmission, comprising:

In some embodiments, the value of M is 2.

In some embodiments, indicating the MCS at the time of Msg3 retransmission by a bit in the DCI for indicating the MCS and a predefined manner includes:

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

and indicating the MCS when the Msg3 is retransmitted through a bit used for indicating the MCS in the DCI.

In some embodiments, P has a value of 2.

In a third aspect, embodiments of the present application provide a terminal, including a memory, a transceiver, and a processor;

A memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

Determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the second MCS index and the offset;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

In some embodiments, the value of M is 2.

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

In some embodiments, P has a value of 2.

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

transmitting DCI for scheduling Msg3 retransmission to the terminal;

Determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the second MCS index and the offset;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

In some embodiments, the value of M is 2.

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

In some embodiments, P has a value of 2.

In a fifth aspect, an embodiment of the present application provides an Msg3 sending apparatus, including:

A first receiving module, configured to receive DCI sent by a network side device and used for scheduling Msg3 retransmission;

a first determining module, configured to determine, when it is determined that the bit number for indicating the MCS in the DCI is less than 5 bits, an MCS at the time of Msg3 retransmission by using the bit for indicating the MCS in the DCI; and/or determining the MCS at the time of Msg3 retransmission by a predefined manner;

and the first sending module is used for sending the Msg3 retransmission according to the determined MCS during the Msg3 retransmission.

In a sixth aspect, embodiments of the present application provide an Msg3 receiving apparatus, including:

a second sending module, configured to send DCI for scheduling Msg3 retransmission to a terminal;

a second receiving module, configured to receive an 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 a bit for indicating MCS in the DCI, and the bit number for indicating MCS is less than 5; and/or, the MCS of the Msg3 retransmission is predefined.

In a seventh aspect, embodiments of the present application further provide a processor-readable storage medium storing a computer program for causing a processor to execute the steps of the Msg3 transmitting method as described in the first aspect or the steps of the Msg3 receiving method as described in the second aspect.

In an eighth aspect, embodiments of the present application further provide a computer-readable storage medium storing a computer program for causing a computer to execute the steps of the Msg3 transmitting method as described in the first aspect or the steps of the Msg3 receiving method as described in the second aspect.

In a ninth aspect, embodiments of the present application further provide a communication device readable storage medium storing a computer program for causing a communication device to execute the steps of the Msg3 transmitting method as described in the first aspect or the steps of the Msg3 receiving method as described in the second aspect.

In a tenth aspect, embodiments of the present application further provide a chip product readable storage medium storing a computer program for causing a chip product to perform the steps of the Msg3 transmitting method as described in the first aspect or the steps of the Msg3 receiving method as described in the second aspect.

According to the Msg3 sending method, the Msg3 receiving method, the Msg3 sending device and the storage medium, through explicit indication and/or a predefined mode, the terminal can determine the modulation order and/or the coding rate corresponding to the MCS adopted in Msg3 retransmission, the MCS used in Msg3 retransmission can be ensured to meet the TBS requirement of retransmission, and the reliability of uplink access is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flow chart of an Msg3 sending method provided in an embodiment of the present application;

fig. 2 is a flow chart of an Msg3 receiving method provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a network side device according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an Msg3 sending device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of an Msg3 receiving apparatus according to an embodiment of the present application.

Detailed Description

In a New air interface (NR) system, when a base station (gNB) schedules a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) by DCI, the base station (gNB) indicates a modulation order Q adopted by PUSCH transmission through an MCS domain in the DCI _m And the coding rate r. Time-frequency domain resources and modulation order Q distributed by terminal/User Equipment (UE) through DCI _m And the coding rate r, the data block size (Transport Block Size, TBS) of the PUSCH transmission is calculated. During uplink access, msg3 is scheduled by an uplink grant (UL grant) in a random access response (Rach Access Response, RAR). The information fields included in the UL grant are shown in table 1.

Table 1 information field included in UL grant

In the Rel-15/16 version, msg3 does not support repeated transmissions. At this time, the 4bit MCS fields in the UL grant are each used to indicate the modulation order and/or coding rate of Msg 3. During the Rel-17 study, RANs 1#107e agreed to use 2 bits in the 4-bit MCS field for indicating the number of repetitions when the UE initiates an initial access to an initial Msg3 repetition transmission (repetition) in the following manner:

(1) Repeat times indication: the 4 states of 2 bits of the original 4-bit MCS field correspond to 4 repetitions of the system information block (System Information Block, SIB) 1 configuration, default {1,2,3,4} if not configured;

(2) MCS indication: the 4 states of the remaining 2 bits of the original MCS correspond to 4 MCS rows (row) configured by SIB1, and if not configured, the default MCS is 0, 1,2, 3.

And for the case of Msg3 retransmission, the UE schedules DCI 0_0 scrambled by a temporary cell radio network temporary identifier (Temporary Cell Radio Network Temporary Identity, TC-RNTI), where there is a 5bit MCS field in the DCI.

However, the current RANs 1#107e conference only specifies the repetition number when the gNB indicates retransmission using a method similar to the initial transmission, but there is no theory as to how the MCS is determined at this time:

(1) Repeat times indication: similar to the initial transmission, the 4 states of 2 bits of the original 5-bit MCS field indicate the number of repetitions;

(2) MCS indication: only the remaining 3 bits of the MCS can be used, and the specific indication scheme has not been decided.

Table 2 is an MCS index (index) table of PUSCH with transform precoding and 64QAM, and as shown in table 2, a 5bit MCS may indicate any one line of indices 0 to 31. The prior art specifies that the TBS for Msg3 retransmission needs to be consistent with the primary Msg 3. This can be achieved in two ways:

(1) MCS which can acquire the same TBS as the primary transmission in MCS 0-MCS 27 is adopted;

(2) Using one of the modulation orders Q of MCS 28-MCS 31 _m The UE performs primary transmission TBS and modulation order Q _m And calculating the coding rate r, and further finishing retransmission of the Msg 3. 28 is less than or equal to I _MCS The modulation orders q, 2, 4, 6 indicated at < 31 correspond to pi/2BPSK, QPSK, 16QAM and 64QAM, respectively, where I _MCS Indicating MCS index.

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

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In the prior art, an MCS domain in DCI for scheduling Msg3 retransmission is separated by 2 bits to indicate the number of repeated transmission times when Msg3 retransmission is performed. At this time, only 3 bits of MCS field in the scheduling DCI are available, the MCS index dedicated for retransmission in the MCS index table in the existing protocol is 28-31, and the 3-bit MCS field cannot be indicated correspondingly, so that Msg3 retransmission may occur, and MCS meeting the retransmission requirement cannot be selected. Therefore, a new scheme for indicating the MCS used in Msg3 retransmission needs to be designed.

Based on the technical problems described above, the embodiments of the present application provide a method, a device, and a storage medium for transmitting Msg3, where when the MCS indication field in DCI for scheduling Msg3 retransmission is less than 5 bits, by explicit indication and/or a predefined manner, the UE may determine the modulation order and/or coding rate corresponding to the MCS used during Msg3 retransmission, so as to ensure that the MCS used during Msg3 retransmission can meet the TBS requirement of retransmission, and improve the reliability of uplink access.

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Fig. 1 is a flow chart of an Msg3 sending method provided in the embodiment of the present application, as shown in fig. 1, the embodiment of the present application provides an Msg3 sending method, where an execution body of the Msg3 sending method may be UE, for example, a mobile phone or the like. The method comprises the following steps:

step 101, receiving DCI sent by a network side device and used for scheduling Msg3 retransmission.

Specifically, the network-side device in the embodiment of the present application may be an access network element, for example, a base station, or may be a core network element, for example, an access and mobility management function (Access and Mobility Management Function, AMF) network element, or the like.

When the network side equipment schedules the Msg3 retransmission, the MCS domain in the DCI may explicitly indicate the MCS adopted when the UE Msg3 retransmits, that is, the indication information of the network side equipment MCS is carried in the MCS domain in the DCI, and the DCI for scheduling the Msg3 retransmission is sent to the UE. Wherein the number of bits used to indicate the MCS is less than 5.

And the UE receives DCI which is sent by the network side equipment and is used for scheduling the retransmission of the Msg 3.

102, determining the MCS at the time of Msg3 retransmission through the bit for indicating the MCS in the DCI when the bit number for indicating the MCS in the DCI is determined to be less than 5 bits; and/or determining the MCS at the time of Msg3 retransmission by a predefined manner.

Specifically, after receiving the DCI, the UE determines whether the number of bits in the DCI for indicating the MCS is less than 5.

If the number of bits in the DCI used to indicate the MCS is equal to 5, the UE may determine the MCS at the time of the Msg3 retransmission using a conventional (legacy) MCS index table (e.g., table 2) based on the bit value indicating the MCS in the DCI.

If the number of bits in the DCI for indicating the MCS is less than (less than) 5, the ue needs to determine the MCS at the time of Msg3 retransmission through the bits in the DCI for indicating the MCS, and the embodiments of the present application provide various solutions, which will be described in detail in the following embodiments.

In addition, after receiving the DCI, the UE may also determine the MCS at the time of Msg3 retransmission according to a predefined manner. For example, the MCS at the time of Msg3 retransmission may be a fixed value, and the embodiments of the present application provide various solutions, which are specifically described in the following embodiments.

Also, the UE may determine the MCS at the time of Msg3 retransmission by combining the bit for indicating the MCS in the DCI and a predefined manner after receiving the DCI, and the embodiments of the present application also provide various solutions, which are described in detail in the following embodiments.

And step 103, transmitting the Msg3 retransmission according to the determined MCS at the time of the Msg3 retransmission.

Specifically, after determining the MCS at the time of the Msg3 retransmission, the UE transmits the Msg3 retransmission according to the determined MCS at the time of the Msg3 retransmission, that is, transmits the Msg3 retransmission according to the modulation order and/or the coding rate corresponding to the MCS.

The network side equipment receives the Msg3 retransmission sent by the UE, and demodulates the Msg3 retransmission according to the modulation order of the MCS when the UE is instructed to carry out the Msg3 retransmission and/or according to the modulation order of the MCS when the Msg3 retransmission is determined in a predefined mode.

According to the Msg3 sending method, through an explicit indication and/or a predefined mode, the UE can determine the modulation order and/or the coding rate corresponding to the MCS adopted in Msg3 retransmission, so that the MCS used in Msg3 retransmission can meet the TBS requirement of retransmission, and the reliability of uplink access is improved.

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

updating the high 2-bit value of the MCS indication domain in the DCI to 1 to obtain a new 5-bit indicated by the MCS indication domain; the bits in the DCI for indicating the MCS are the lower 3 bits in the MCS indication field in the DCI;

Specifically, the embodiment of the application determines the MCS adopted by the UE in the MCS index table through 3 bits indicating the MCS.

The MCS index table in the embodiment of the present application adopts a legacy MCS index table (e.g., table 2).

The method comprises the following specific steps of interpreting bits except 3 bits used for indicating MCS in original 5 bits MCS as 1 when determining MCS index:

the UE updates the high 2-bit value of the MCS indication domain in the DCI to 1 to obtain a new 5-bit indicated by the MCS indication domain; the bits in the DCI for indicating the MCS are the lower 3 bits in the MCS indication field in the DCI.

The UE determines a first MCS index from the new 5 bits indicated by the MCS indication field.

The UE determines the MCS at the time of Msg3 retransmission according to the first MCS index and a first MCS index table (legacy MCS index table).

For example, the mechanism at the time of reusing the existing retransmission is to indicate bits for indicating MCS to the MCS index table of legacy MCS as far as possible with MCS index 28.ltoreq.I _MCS The range is less than or equal to 31. The upper 2 bits in the original 5-bit MCS field are used to indicate the number of retransmissions at the Msg3 retransmission, while the lower 3 bits are still used to indicate the MCS. Let the UE Msg3 retransmit time, 5 bit MCS be '10100'. When the UE determines the repeat transmission times of the Msg3 retransmission, 2 bits MSB '10' are read 'Corresponding to 4 times of repeated transmission; when the UE determines the MCS for the Msg3 retransmission, the 2-bit MSB '10' is updated/interpreted as '11', and combined with the 3-bit LSB '100' to form '11100', so that the modulation order adopted for the Msg3 retransmission is determined to be q corresponding to one row with index of 28 in the legacy MCS index table, i.e. the corresponding modulation mode is pi/2BPSK.

According to the embodiment of the application, when the MCS index is determined, bits except for 3 bits used for indicating the MCS in the original 5 bits of MCS are interpreted as 1 for determination, so that the MCS used during retransmission of Msg3 can meet the TBS requirement of retransmission, and the reliability of uplink access is improved.

determining an X bit used for indicating MCS in DCI;

taking the X bit as a low bit and taking the bits with the 5-X bit values of 1 as high bit to generate a new 5 bit;

determining a first MCS index according to the new 5 bits;

Specifically, the embodiment of the application determines the MCS adopted by the UE in the MCS index table through the X bits indicating the MCS.

When determining the MCS index, the 5-X ratio high bit and the X bit indicating the MCS are determined together, wherein the 5-X bit high bit is 1, and the specific steps are as follows:

the UE determines X bits in the DCI for indicating the MCS.

The UE uses the X bit as the low bit and uses the bits with the 5-X bit values of 1 as the high bit to generate new 5 bits.

The UE determines a first MCS index from the new 5 bits.

The X bits may be high-order X bits in the MCS indication field in the DCI, or low-order X bits in the MCS indication field in the DCI. The value of X may be 2 or 3.

For example, the mechanism at the time of reusing the existing retransmission is to indicate bits for indicating MCS to the MCS index table of legacy MCS as far as possible with MCS index 28.ltoreq.I _MCS The range is less than or equal to 31. Restoring the X bit MCS for indicating the MCS to 5 bits through the high-order complementary bit 1, thereby realizing that 28 is less than or equal to I in the MCS indication legacy MCS index table _MCS The range is less than or equal to 31. Assume that the UE Msg3 retransmits the MCS that was determined to be retransmitted using all 3 bits left to indicate the MCS. When the 3 bits are '101', the MCS field is changed to '11101' by adding 2 bits '11' to the upper bits, so that the modulation order used for Msg3 retransmission is determined to be 2, i.e., the corresponding modulation scheme is QPSK, corresponding to one row with index of 29 in the legacy MCS index table. Wherein the 3-bit MCS may be either the upper 3 bits or the lower 3 bits in the original 5-bit MCS field. The present embodiment focuses only on the remaining bits still used for MCS indication 3 bits and completes the 5 bit MCS index indication at the high order complement '11'.

Similarly, if the UE Msg3 retransmits, the 2-bit MCS field is used to determine the MCS for the retransmission, and when the 2-bit MCS field is '10', the 3-bit MCS field is added to the high-order MCS field to change the indication into '11110', so that the modulation order used for the Msg3 retransmission is determined to be 4, that is, the corresponding modulation scheme is 16QAM, corresponding to one row with index of 30 in the legacy MCS index table. Wherein the 2-bit MCS may be any 2 bits of the 3 bits remaining still used for MCS indication. The present embodiment focuses only on 2 bits for MCS indication and completes 5-bit MCS index indication at the high-order complement '111'.

In the embodiment of the application, when the MCS index is determined, the 5-X bit high bits and the X bit indicating the MCS are determined together, and the 5-X bit high bits are 1, so that the MCS used in the retransmission of Msg3 can meet the TBS requirement of the retransmission, and the reliability of uplink access is improved.

determining an X bit used for indicating MCS in DCI;

determining a first MCS index according to the second MCS index and the offset;

The method comprises the following specific steps of determining an MCS index by jointly determining X bits indicating the MCS and an offset, wherein the offset is (32-2^X):

the UE determines X bits in the DCI for indicating the MCS.

The UE determines a second MCS index according to the X bits and an offset of the MCS index.

The UE determines a first MCS index according to the second MCS index and the offset.

Wherein the offset is (32-2^X). The X bits may be high-order X bits in the MCS indication field in the DCI or low-order X bits in the MCS indication field in the DCI. The value of X may be 2 or 3.

For example, the mechanism at the time of reusing the existing retransmission is to indicate bits for indicating MCS to the MCS index table of legacy MCS as far as possible with MCS index 28.ltoreq.I _MCS The range is less than or equal to 31. MCS indication 28 +.I is achieved by increasing the value of the X bit indication (value) that is still used to indicate MCS by an offset _MCS The range is less than or equal to 31. Assume that the UE Msg3 retransmits using all 3 bits left to indicate the MCS to determine the retransmitted MCS, at which time the offset is 32-2^3 =24. When the 3 bits are '101', the corresponding value is 5, the corresponding value is increased by an offset of 24, so that the modulation order adopted by Msg3 retransmission is determined to be 2, namely, the modulation mode is QPSK, corresponding to one row with an index of 29 in the legacy MCS index table. Wherein the 3-bit MCS may be either the upper 3 bits or the lower 3 bits in the original 5-bit MCS field. The present embodiment focuses only on the remaining fingers And (3) showing the value corresponding to the 3 bits of the MCS, and finishing MCS index indication after increasing the offset.

Similarly, assuming that UE Msg3 retransmits, 2 bits are used to determine the MCS for the retransmission, the offset is 32-2^2 =28. When the 2 bits are '10', the corresponding value is 2, the corresponding value is increased by 28 offset, so that the modulation order adopted by the Msg3 retransmission is determined to be 4, namely, the modulation mode is 16QAM, corresponding to one row with the index of 30 in the legacy MCS index table. Wherein the 2-bit MCS may be any 2 bits of the 3 bits remaining to be used for indicating the MCS. The present embodiment focuses on only the value corresponding to 2 bits for MCS indication, and completes MCS index indication after increasing the offset.

According to the embodiment of the application, when the MCS index is determined, the X bits indicating the MCS and the offset are determined together, so that the MCS used during retransmission of the Msg3 can meet the TBS requirement of retransmission, and the reliability of uplink access is improved.

determining an X bit used for indicating MCS in DCI;

determining a first MCS index according to the X bits;

determining the MCS when the Msg3 is retransmitted according to the first MCS index and the second MCS index table, wherein each row in the second MCS index table only comprises the modulation order, the TBS for retransmitting the Msg3 is the TBS for the primary transmission of the 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.

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

The specific steps of determining the MCS at the time of Msg3 retransmission by the bit used for indicating the MCS in the DCI are as follows:

the UE determines X bits in the DCI for indicating the MCS.

The UE determines a first MCS index from the X-bit bits.

The UE determines the MCS when the Msg3 is retransmitted according to the first MCS index and a second MCS index table (redefined MCS index table), each row in the second MCS index table only comprises the modulation order, the TBS of the retransmission Msg3 is the TBS of the primary transmission of the 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.

The embodiment of the present application defines a new MCS index table, and indicates the corresponding MCS by the bit for indicating the MCS, as shown in table 3. Each row in the MCS index table contains only modulation order and may correspond to several rows of MCSs for retransmission in the legacy MCS index table, for example, four rows with MCS indexes 28-31 in table 2. When the MCS indicated by the DCI only contains modulation order, the TBS of the Msg3 retransmission is directly the TBS calculated by the initial transmission. At this time, the MCS corresponding to the Msg3 retransmission can be indicated by the 2-bit MCS by one-to-one correspondence between any 2 bits of the bits still used for indicating the MCS in the original 5-bit MCS and the MCS index in table 3.

Table 3 defines one of the new MCS index tables

I _MCS	Q _m	r
			0	q	Reserved
1	2	Reserved
			2	4	Reserved
3	6	Reserved

For example, when 2 bits are '01', the index in the corresponding table 3 is 1, and the modulation order is 2 at this time, that is, the UE modulates with QPSK.

Of course, the 3 bits still used to indicate MCS may also be in one-to-one correspondence with the MCS index in the following table, for example, when the 3 bits are '000', the index in the corresponding table 3 is 0, and the modulation order is q, that is, the UE modulates with pi/2 BPSK.

Similarly, the second MCS index table may be used to indicate that the candidate value (candidate value) of the MCS corresponds to the MCS index one by one as shown in table 4.

Table 4 defines two of the new MCS index tables

I _MCS	Q _m	r
			0	2	Reserved
1	4	Reserved
			2	6	Reserved

According to the embodiment of the application, the MCS during the retransmission of the Msg3 is determined through the X bits of the indication MCS and the redefined MCS index table, so that the MCS used during the retransmission of the Msg3 can meet the TBS requirement of the retransmission, and the reliability of uplink access is improved.

determining an X bit used for indicating MCS in DCI;

determining a first MCS index according to the X bits;

determining the MCS of the Msg3 retransmission according to the first MCS index and a third MCS index table, wherein the third MCS index table contains MCS elements in the MCS index table adopted by 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 bit, each row in the second MCS index table only comprises modulation order, and the TBS of the Msg3 retransmission is the TBS of the Msg3 initial transmission.

the UE determines X bits in the DCI for indicating the MCS.

The UE determines a first MCS index from the X-bit bits.

The UE determines the MCS in the retransmission of the Msg3 according to the first MCS index and a third MCS index table (redefined MCS index table), wherein the third MCS index table contains MCS elements in the MCS index table adopted in the primary transmission of the Msg3 and 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 comprises the modulation order, and the TBS of the retransmission of the Msg3 is the TBS of the primary transmission of the Msg 3.

The X bits may 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.

The embodiment of the present application defines a new MCS index table (third MCS index table), and indicates the corresponding MCS by the bit for indicating the MCS, as shown in table 5, and the third MCS index table contains all the MCSs in the MCS index table used at the time of the initial transmission and all the MCSs in the second MCS index table in the above embodiment. The MCS index and the specific MCS in the third MCS index table may be arbitrarily combined, for example, the first few rows of the third MCS index table behave as the second MCS index table, and the second few rows behave as the MCS index table adopted in the initial transmission. At this time, 3 bits still used for indicating the MCS are in one-to-one correspondence with the MCS indexes in the third MCS index table, that is, the MCS corresponding to the Msg3 retransmission is indicated by 3 bits.

Table 5 defines a third of the new MCS index tables

I _MCS	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

For example, when the 3 bits are '101', the MCS index is 5, the modulation order is 2, the ue modulates with QPSK, and the code rate r is calculated from the TBS at the time of initial transmission and the modulation order 2.

In addition, when SIB1 is not provided with MCS index table for Msg3 initial transmission, 0.ltoreq.I in the legacy MCS index table selected by default for Msg3 initial transmission _MCS The first four lines corresponding to less than or equal to 3, at the moment, I in the first four lines legacy MCS index table of the third MCS index table _MCS Four rows of {0,1,2,3 }.

As shown in table 6, the MCS index table used for the primary transmission of Msg3 included in the third MCS index table may be four candidate MCSs selected from the legacy MCS index table in SIB1 configuration. For example, the candidate MCS is legacyI in MCS index table _MCS Four rows of {1,6,9,14 }.

Table 6 defines four of the new MCS index tables

Determining the most significant bit or the least significant bit of X bits used for indicating MCS in DCI;

determining a fourth MCS index table according to the highest bit or the lowest bit of the X bits, and determining a first MCS index according to the X-1 bit divided by the highest bit or the lowest bit of the X bits; the fourth MCS index table is the same as the MCS index table or the second MCS index table adopted in the primary transmission of the Msg3, the fourth MCS index table is characterized as the same as the MCS index table adopted in the primary transmission of the Msg3 when the highest bit or the lowest bit is 0 or 1, and the fourth MCS index table is characterized as the same as the second MCS index table when the highest bit or the lowest bit is 1 or 0; each row in the second MCS index table only comprises modulation orders, and the TBS retransmitted by Msg3 is the TBS initially transmitted by Msg 3;

The MCS index table in the embodiment of the present application adopts an MCS index table adopted in the primary transmission of Msg3 or a redefined MCS index table.

the UE determines the most significant bit or the least significant bit of the X bits in the DCI for indicating the MCS.

The UE determines a fourth MCS index table according to the highest bit or the lowest bit of the X bits, and determines a first MCS index according to the X-1 bit divided by the highest bit or the lowest bit of the X bits; the fourth MCS index table is the same as the MCS index table or the second MCS index table (redefined MCS index table) adopted in the primary transmission of Msg3, the fourth MCS index table is characterized as the same as the MCS index table adopted in the primary transmission of Msg3 when the highest bit or the lowest bit is 0 or 1, and the fourth MCS index table is characterized as the same as the second MCS index table when the highest bit or the lowest bit is 1 or 0; each row in the second MCS index table includes only modulation order and the TBS for Msg3 retransmission is the TBS for Msg3 initial transmission.

And the UE determines the MCS during the retransmission of the Msg3 according to the first MCS index and the fourth MCS index table.

The embodiment of the application indicates the corresponding MCS through the bit for indicating the MCS based on the MCS index table adopted during the initial transmission of the Msg3 or the redefined MCS index table. The MCS index table may be the MCS index table used for the primary transmission of Msg3, or the second MCS index table (redefined MCS index table) in the above embodiment, and the indication needs to be performed by any 1 bit (such as the most significant bit) of the 3 bits indicating the MCS.

For example, when the 1 bit is '0', an MCS index table at the time of Msg3 initial transmission is used; when the 1 bit is '1', the second MCS index table in the above embodiment is used. At this time, 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 that the second MCS index table in the above embodiment is adopted, the low 2 bits '01' indicate the index 1 in the second MCS index table, and the corresponding MCS in the second row in the second MCS index table, that is, the modulation order is 2, and the QPSK modulation mode is adopted.

According to the embodiment of the application, based on the MCS index table adopted during primary transmission of the Msg3 or the redefined MCS index table, the MCS during retransmission of the Msg3 is determined through the X bit of the instruction MCS, so that the MCS used during retransmission of the Msg3 can meet the TBS requirement of retransmission, and the reliability of uplink access is improved.

determining an X bit used for indicating MCS in DCI;

determining a first MCS index according to the X bits;

determining the MCS of the Msg3 retransmission according to a first MCS index and a fifth MCS index table, wherein the fifth MCS index table comprises a part of MCS elements in the first MCS index table and a part or all of MCS elements in a 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 comprises modulation order, and the TBS of the Msg3 retransmission is the TBS of the Msg3 primary transmission; a part of MCS elements in the first MCS index table constituting the fifth MCS index table are associated with MCSs employed for the Msg3 initial transmission.

the UE determines X bits in the DCI for indicating the MCS.

The UE determines a first MCS index from the X-bit bits.

The UE determines the MCS of Msg3 retransmission according to a first MCS index and a fifth MCS index table (redefined MCS index table), wherein the fifth MCS index table comprises partial MCS elements in the first MCS index table (legacy MCS index table) and partial or all MCS elements in a second MCS index table (redefined 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 comprises modulation order, and the TBS of Msg3 retransmission is the TBS of Msg3 primary transmission; a part of MCS elements in the first MCS index table constituting the fifth MCS index table are associated with MCSs employed for the Msg3 initial transmission.

The embodiment of the application defines a new MCS index table, and indicates the corresponding MCS through the bit for indicating the MCS. The MCS index table contains a partial MCS of the legacy MCS index table, and a partial or full MCS of the MCS index table in the second MCS index table in the above embodiment. The retransmission DCI may indicate 8 MCS indexes by indicating 3 bits in total for MCS.

And (3) dynamically defining a continuous MCS index range for the MCS adopted by the primary transmission of Msg3 in the legacy MCS index table for part of candidate MCSs in the legacy MCS index table.

The MCS index range size is determined jointly by the X bits indicating the MCS and the number of MCS indexes in the second MCS index table contained in the fifth MCS index table.

Let Msg3 primary transmission use MCS with MCS index 2 in legacy MCS index table, i.e. modulation order 2. As shown in table 7, the fifth MCS index table may include MCSs having a modulation order of 2 or less corresponding to table 3, for a total of two MCSs. The remaining 6 (8-2=6) MCS indices can dynamically delineate a contiguous MCS index range, e.g., 0.ltoreq.I, from the legacy MCS index table based on MCS index 2 _MCS And is less than or equal to 5. The MCS index and the specific MCS in the fifth MCS index table may be arbitrarily combined, and in this embodiment, the candidate MCS in the legacy MCS index table is placed in the first several rows.

Table 7 defines five of the new MCS index tables

I _MCS	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

The fifth MCS index table may further include an MCS having a modulation order equal to 2 in table 3, and the remaining 7 (8-1=7) MCS indexes dynamically define a continuous MCS index range from the legacy MCS index table based on the MCS index 2.

The fifth MCS index table may also completely contain table 3, and the remaining 4 (8-4=4) MCS indexes dynamically define a continuous MCS index range from the legacy MCS index x table based on MCS index 2. The Msg3 primary MCS is placed as far as possible in the middle of the dynamically delimited MCS index range.

Specifically, the embodiment of the application determines the MCS at the time of Msg3 retransmission through a predefined manner. The TBS retransmitted by Msg3 is the TBS of initial transmission of Msg 3. The modulation order corresponding to the MCS adopted by the predefined UE is fixed as M.

The modulation order M may be q (pi/2 BPSK), and the modulation order M may also be 2 (QPSK).

For example, the protocol predefines that the modulation order employed when Msg3 retransmits is fixed to 2, i.e. corresponds to QPSK modulation. Then, the coding rate r of the Msg3 retransmission can be obtained through the TBS of the primary transmission of the Msg3 and the modulation order 2, and the Msg3 retransmission is further completed.

According to the embodiment of the application, the modulation order corresponding to the MCS adopted by the predefined UE is a fixed value, so that the MCS used in the retransmission of the Msg3 can meet the TBS requirement of the retransmission, and the reliability of uplink access is improved.

Specifically, the embodiment of the application determines the MCS at the time of Msg3 retransmission through a predefined manner. The TBS retransmitted by Msg3 is the TBS of initial transmission of Msg 3. The modulation order of the MCS when the UE performs Msg3 retransmission is predefined to be the modulation order of the MCS adopted when the Msg3 is transmitted initially.

For example, the protocol may predefine that the modulation order used in the retransmission of Msg3 is the same as the modulation order used in the initial transmission of Msg 3. Assuming that the modulation order used for the primary transmission of Msg3 is q, the modulation order used for the retransmission of Msg3 in this embodiment is also q, i.e. corresponding pi/2BPSK modulation. Then, the coding rate r of the Msg3 retransmission can be obtained through the TBS of the primary transmission of the Msg3 and the modulation order q, and the Msg3 retransmission is further completed.

According to the embodiment of the application, the modulation order of the MCS when the UE performs Msg3 retransmission is predefined to be the modulation order of the MCS adopted when the Msg3 is initially transmitted, so that the MCS used when the Msg3 is retransmitted can be ensured to meet the TBS requirement of retransmission, and the reliability of uplink access is improved.

Specifically, the embodiment of the application determines the MCS at the time of Msg3 retransmission through the bit used for indicating the MCS in the DCI and a predefined manner.

In the embodiment of the application, firstly, the MCS adopted by the primary transmission of the Msg3 needs to be judged, the candidate MCS adopted by the primary transmission of the Msg3 is determined to be a default value, or the modulation order of the candidate MCS adopted by the primary transmission of the Msg3 is determined not to exceed P, and then the UE determines that the modulation order corresponding to the MCS in the retransmission of the Msg3 is N in a predefined mode.

The value of the modulation order N may be q (pi/2 BPSK), and the value of the modulation order N may be 2 (QPSK). The value of P may be 2.

The specific manner of determining the MCS at the time of Msg3 retransmission by the UE through the predefined manner may be the same as any of the above embodiments of determining the MCS at the time of Msg3 retransmission through the predefined manner, which will not be described herein.

For example, no candidate MCS is configured during primary transmission of Msg3, that is, the optional MCS during primary transmission of Msg3 is default MCS 0 to MCS 3 in the legacy MCS index table, or all candidate MCSs selectable during primary transmission of Msg3 are configured by SIB, and the modulation order corresponding to all candidate MCSs configured by SIB is not more than 2, then the UE adopts predefined modulation order 2, that is, corresponding to QPSK modulation during retransmission of Msg 3. Then, the coding rate r of the Msg3 retransmission can be obtained through the TBS of the primary transmission of the Msg3 and the modulation order 2, and the Msg3 retransmission is further completed.

According to the embodiment of the application, the MCS in the retransmission of the Msg3 is determined through the bit for indicating the MCS in the DCI and the predefined mode, so that the MCS used in the retransmission of the Msg3 can meet the TBS requirement of the retransmission, and the reliability of uplink access is improved.

The MCS at the time of Msg3 retransmission is determined by a bit for indicating the MCS in the DCI.

In the embodiment of the present application, firstly, the MCS adopted by the primary transmission of the Msg3 needs to be determined, and the candidate MCS adopted during the primary transmission of the Msg3 is configured as SIB1, or if at least one of the candidate MCSs adopted during the primary transmission of the Msg3 has a modulation order exceeding P, the UE determines the MCS during retransmission of the Msg3 through the bit used for indicating the MCS in the DCI.

The specific manner of determining the MCS when the Msg3 is retransmitted by the UE through the bit for indicating the MCS in the DCI may be the same as any one of the above embodiments of determining the MCS when the Msg3 is retransmitted by the bit for indicating the MCS in the DCI, which is not repeated herein.

For example, if only the selectable MCS candidate at the time of initial transmission is SIB1 configured, or if the selectable MCS candidate at the time of initial transmission is SIB1 configured, and at least one of the configured MCS candidates corresponds to a modulation order exceeding 2, then the index of the MCS employed by the UE at the time of Msg3 retransmission is determined by interpreting bits other than 3 bits for indicating the MCS in the original 5-bit MCS as 1.

It should be noted that: in the above embodiment, the X bits used for indicating the MCS may be part of bits in the reuse MCS field, or may be X bits used for indicating the MCS and split separately from the original 5-bit MCS field, which is not limited in this aspect of the present invention, and focuses on how to determine the MCS used in Msg3 retransmission according to the X bits still used for indicating the MCS.

Fig. 2 is a flow chart of an Msg3 receiving method provided in the embodiment of the present application, as shown in fig. 2, the embodiment of the present application provides an Msg3 receiving method, where an execution body of the Msg3 receiving method may be a network side device, for example, a base station or the like. The method comprises the following steps:

step 201, sending DCI for scheduling Msg3 retransmission to a terminal;

step 202, receiving an Msg3 retransmission sent by the terminal, wherein the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by a bit for indicating MCS in the DCI, and the bit number for indicating MCS is less than 5; and/or, the MCS of the Msg3 retransmission is predefined.

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

determining an X bit used for indicating MCS in the DCI;

Determining a first MCS index according to the second MCS index and the offset;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

In some embodiments, the value of M is 2.

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

In some embodiments, P has a value of 2.

Specifically, the Msg3 receiving method provided in the embodiment of the present application may refer to the embodiment of the Msg3 sending method in which the execution body is a terminal, and may achieve the same technical effects, and specific details of the same or corresponding parts and beneficial effects as those of the corresponding embodiment of the method in the embodiment are not described herein.

Fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present application, as shown in fig. 3, where the terminal includes a memory 320, a transceiver 300, and a processor 310, where:

a memory 320 for storing a computer program; a transceiver 300 for transceiving data under the control of the processor 310; a processor 310 for reading the computer program in the memory 320 and performing the following operations:

Specifically, the transceiver 300 is used to receive and transmit data under the control of the processor 310.

Wherein in fig. 3, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 310 and various circuits of memory represented by memory 320, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 300 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The user interface 330 may also be an interface capable of interfacing with an inscribed desired device for a different user device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

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 in performing operations.

In some embodiments, processor 310 may be a CPU (Central processing Unit), ASIC (Application Specific Integrated Circuit ), FPGA (Field-Programmable Gate Array, field programmable Gate array) or CPLD (Complex Programmable Logic Device ), and the processor may also employ a multicore architecture.

The processor is configured to execute any of the methods provided in the embodiments of the present application by invoking a computer program stored in a memory in accordance with the obtained executable instructions. The processor and the memory may also be physically separate.

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the second MCS index and the offset;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

In some embodiments, the value of M is 2.

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

In some embodiments, P has a value of 2.

It should be noted that, the terminal provided in this embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is a terminal, and can achieve the same technical effects, and specific details of the same or corresponding parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.

Fig. 4 is a schematic structural diagram of a network side device according to an embodiment of the present application, as shown in fig. 4, where the network side device includes a memory 420, a transceiver 400, and a processor 410, where:

A memory 420 for storing a computer program; a transceiver 400 for transceiving data under the control of the processor 410; a processor 410 for reading the computer program in the memory 420 and performing the following operations:

transmitting DCI for scheduling Msg3 retransmission to the terminal;

Specifically, the transceiver 400 is configured to receive and transmit data under the control of the processor 410.

Wherein in fig. 4, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 410 and various circuits of memory represented by memory 420, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 400 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 410 is responsible for managing the bus architecture and general processing, and the memory 420 may store data used by the processor 410 in performing operations.

The processor 410 may be a Central Processing Unit (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), or it may employ a multi-core architecture.

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the second MCS index and the offset;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

In some embodiments, the value of M is 2.

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

In some embodiments, P has a value of 2.

Specifically, the network side device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is the network side device, and can achieve the same technical effects, and detailed descriptions of the same or corresponding parts and beneficial effects as those of the method embodiment in the embodiment are omitted herein.

Fig. 5 is a schematic structural diagram of an Msg3 sending device provided in an embodiment of the present application, and as shown in fig. 5, the embodiment of the present application provides an Msg3 sending device, including a first receiving module 501, a first determining module 502, and a first sending module 503, where:

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

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the second MCS index and the offset;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

In some embodiments, the value of M is 2.

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

In some embodiments, P has a value of 2.

Specifically, the Msg3 sending device provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is a terminal, and can achieve the same technical effects, and detailed descriptions of the same or corresponding parts and beneficial effects as those of the method embodiment in the embodiment are omitted herein.

Fig. 6 is a schematic structural diagram of an Msg3 receiving apparatus provided in the embodiment of the present application, as shown in fig. 6, the embodiment of the present application provides an Msg3 receiving apparatus, including a second sending module 601 and a second receiving module 602, where:

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 an 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 a bit for indicating MCS in the DCI, and the bit number for indicating MCS is less than 5; and/or, the MCS of the Msg3 retransmission is predefined.

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

Determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the second MCS index and the offset;

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

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

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

In some embodiments, the value of M is 2.

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

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

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

In some embodiments, P has a value of 2.

Specifically, the Msg3 receiving apparatus provided in the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is a network side device, and can achieve the same technical effects, and detailed descriptions of the same or corresponding parts and beneficial effects as those of the method embodiment in the embodiment are omitted herein.

It should be noted that the division of the units/modules in the embodiments of the present application is merely a logic function division, and other division manners may be implemented in practice. In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In some embodiments, there is also provided a processor-readable storage medium storing a computer program for causing the processor to perform the method provided in the above embodiments, including:

receiving DCI which is sent by network side equipment and is used for scheduling Msg3 retransmission; determining the MCS at the time of Msg3 retransmission by the bit used for indicating the MCS in the DCI under the condition that the bit number used for indicating the MCS in the DCI is less than 5 bits; and/or determining the MCS at the time of Msg3 retransmission by a predefined manner; and sending the Msg3 retransmission according to the determined MCS at the time of the Msg3 retransmission.

Or comprises:

transmitting DCI for scheduling Msg3 retransmission to the terminal; receiving Msg3 retransmission sent by the terminal, wherein the Msg3 retransmission is scheduled by the DCI; wherein, the MCS of the Msg3 retransmission is indicated by a bit for indicating MCS in the DCI, and the bit number for indicating MCS is less than 5; and/or, the MCS of the Msg3 retransmission is predefined.

It should be noted that: the processor-readable storage medium may be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), and the like.

In addition, it should be noted that: the terms "first," "second," and the like in the embodiments of the present application are used for distinguishing between similar objects and not for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the terms "first" and "second" are generally intended to be used in a generic sense and not to limit the number of objects, for example, the first object may be one or more.

In the embodiment of the application, the term "and/or" describes the association relationship of the association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The term "plurality" in the embodiments of the present application means two or more, and other adjectives are similar thereto.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G system. For example, suitable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (general packet Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR), and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved Packet System, EPS), 5G system (5 GS) etc. may also be included in the system.

The terminal device according to the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and the embodiments of the present application are not limited.

The network device according to the embodiment of the present application may be a base station, where the base station may include a plurality of cells for providing services for a terminal. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. The network device may be operable to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like. In some network structures, the network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions may each be made between a network device and a terminal device using one or more antennas, and the MIMO transmissions may be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. An Msg3 sending method, comprising:

2. The Msg3 transmitting method of claim 1, wherein determining the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

3. The Msg3 transmitting method of claim 1, wherein determining the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

4. The Msg3 transmitting method of claim 1, wherein determining the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the second MCS index and the offset;

5. The Msg3 delivery method of claim 4 wherein the offset is (32-2^X).

6. The Msg3 transmitting method of claim 1, wherein determining the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

7. The Msg3 sending method of any one of claims 3-6 wherein the X-bit is an upper X-bit or a lower X-bit in an MCS indication field in the DCI.

8. The Msg3 delivery method of claim 7 wherein the value of X is 2 or 3.

9. The Msg3 transmitting method of claim 1, wherein determining the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

10. The Msg3 transmitting method of claim 1, wherein determining the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

11. The Msg3 transmitting method of claim 1, wherein determining the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

12. The Msg3 sending method of any one of claims 9-11, wherein the X-bit is a high order 3-bit or a low order 3-bit in an MCS indication field in the DCI.

13. The Msg3 transmission method of claim 1 wherein determining the MCS at Msg3 retransmission by a predefined manner comprises:

14. The Msg3 delivery method of claim 13 wherein the value of M is 2.

15. The Msg3 transmission method of claim 1 wherein determining the MCS at Msg3 retransmission by a predefined manner comprises:

16. The Msg3 transmitting method according to claim 1, characterized in that determining the MCS at the time of Msg3 retransmission by means of a bit for indicating the MCS in the DCI and a predefined manner, comprises:

17. The Msg3 delivery method of claim 16 wherein the value of N is q or 2.

18. The Msg3 transmitting method according to claim 1, characterized in that determining the MCS at the time of Msg3 retransmission by means of a bit for indicating the MCS in the DCI and a predefined manner, comprises:

19. The Msg3 delivery method as claimed in any one of claims 16 to 18, wherein the value of P is 2.

20. A Msg3 receiving method, comprising:

transmitting DCI for scheduling Msg3 retransmission to the terminal;

21. The Msg3 receiving method as claimed in claim 20, wherein indicating the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

22. The Msg3 receiving method as claimed in claim 20, wherein indicating the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

23. The Msg3 receiving method as claimed in claim 20, wherein indicating the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

Determining a first MCS index according to the second MCS index and the offset;

24. The Msg3 receiving method as claimed in claim 23, wherein the offset is (32-2^X).

25. The Msg3 receiving method as claimed in claim 20, wherein indicating the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

26. The Msg3 receiving method of any one of claims 22-25 wherein the X-bit is an upper X-bit or a lower X-bit in an MCS indication field in the DCI.

27. The Msg3 receiving method as claimed in claim 26, wherein the value of X is 2 or 3.

28. The Msg3 receiving method as claimed in claim 20, wherein indicating the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

29. The Msg3 receiving method as claimed in claim 20, wherein indicating the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

30. The Msg3 receiving method as claimed in claim 20, wherein indicating the MCS at the time of Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

31. The Msg3 receiving method of any one of claims 28-30 wherein the X-bit is a high order 3-bit or a low order 3-bit in an MCS indication field in the DCI.

32. The Msg3 receiving method as claimed in claim 20, wherein predefining the MCS at the time of Msg3 retransmission comprises:

33. The Msg3 receiving method as claimed in claim 32, wherein the value of M is 2.

34. The Msg3 receiving method as claimed in claim 20, wherein predefining the MCS at the time of Msg3 retransmission comprises:

35. The Msg3 receiving method as claimed in claim 20, wherein indicating the MCS at the time of Msg3 retransmission through a bit for indicating the MCS and a predefined manner in the DCI comprises:

36. The Msg3 receiving method as claimed in claim 35, wherein the value of N is q or 2.

37. The Msg3 receiving method as claimed in claim 20, wherein indicating the MCS at the time of Msg3 retransmission through a bit for indicating the MCS and a predefined manner in the DCI comprises:

38. The Msg3 receiving method as claimed in any one of claims 35 to 37, wherein the value of P is 2.

39. A terminal comprising a memory, a transceiver, and a processor;

40. The terminal of claim 39, wherein determining the MCS at the Msg3 retransmission by the bit in the DCI for indicating the MCS comprises:

41. The terminal of claim 39, wherein determining the MCS at the Msg3 retransmission by the bit in the DCI for indicating the MCS comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

42. The terminal of claim 39, wherein determining the MCS at the Msg3 retransmission by the bit in the DCI for indicating the MCS comprises:

determining an X bit used for indicating MCS in the DCI;

Determining a first MCS index according to the second MCS index and the offset;

43. The terminal of claim 42, wherein the offset is (32-2^X).

44. The terminal of claim 39, wherein determining the MCS at the Msg3 retransmission by the bit in the DCI for indicating the MCS comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

45. The terminal of any of claims 41-44, wherein the X-bit is an upper X-bit or a lower X-bit in an MCS indication field in the DCI.

46. The terminal of claim 45, wherein the value of X is 2 or 3.

47. The terminal of claim 39, wherein determining the MCS at the Msg3 retransmission by the bit in the DCI for indicating the MCS comprises:

Determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

48. The terminal of claim 39, wherein determining the MCS at the Msg3 retransmission by the bit in the DCI for indicating the MCS comprises:

49. The terminal of claim 39, wherein determining the MCS at the Msg3 retransmission by the bit in the DCI for indicating the MCS comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

50. The terminal of any of claims 47-49, wherein the X-bit is a high order 3 bits or a low order 3 bits in an MCS indication field in the DCI.

51. The terminal of claim 39, wherein determining the MCS at the time of Msg3 retransmission by a predefined manner comprises:

52. The terminal of claim 51, wherein the value of M is 2.

53. The terminal of claim 39, wherein determining the MCS at the time of Msg3 retransmission by a predefined manner comprises:

54. The terminal of claim 39, wherein determining the MCS at the time of Msg3 retransmission by the bit in the DCI for indicating the MCS and a predefined manner comprises:

55. The terminal of claim 54, wherein the value of N is q or 2.

56. The terminal of claim 39, wherein determining the MCS at the time of Msg3 retransmission by the bit in the DCI for indicating the MCS and a predefined manner comprises:

57. The terminal of any of claims 54-56, wherein P has a value of 2.

58. A network side device, comprising a memory, a transceiver, and a processor;

transmitting DCI for scheduling Msg3 retransmission to the terminal;

59. The network side device of claim 58, wherein indicating the MCS at Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

60. The network side device of claim 58, wherein indicating the MCS at Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the new 5 bits;

61. The network side device of claim 58, wherein indicating the MCS at Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the second MCS index and the offset;

62. The network-side device of claim 61, wherein the offset is (32-2^X).

63. The network side device of claim 58, wherein indicating the MCS at Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

64. The network-side device of any one of claims 60-63, wherein the X-bit is an upper X-bit or a lower X-bit in an MCS indication field in the DCI.

65. The network-side device of claim 64, wherein the value of X is 2 or 3.

66. The network side device of claim 58, wherein indicating the MCS at Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

67. The network side device of claim 58, wherein indicating the MCS at Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

68. The network side device of claim 58, wherein indicating the MCS at Msg3 retransmission by the bit for indicating the MCS in the DCI comprises:

determining an X bit used for indicating MCS in the DCI;

determining a first MCS index according to the X bits;

69. The network-side device of any of claims 66-68, wherein the X-bit is a high order 3-bit or a low order 3-bit in an MCS indication field in the DCI.

70. The network-side device of claim 58 wherein predefining the MCS at the Msg3 retransmission comprises:

71. The network-side device of claim 70, wherein the value of M is 2.

72. The network-side device of claim 58 wherein predefining the MCS at the Msg3 retransmission comprises:

73. The network side device of claim 58, wherein indicating the MCS at Msg3 retransmission by the bit in the DCI for indicating the MCS and a predefined manner comprises:

74. The network-side device of claim 73, wherein the value of N is q or 2.

75. The network side device of claim 58, wherein indicating the MCS at Msg3 retransmission by the bit in the DCI for indicating the MCS and a predefined manner comprises:

76. The network-side device of any one of claims 73-75, wherein P has a value of 2.

77. An Msg3 transmitting apparatus comprising:

78. An Msg3 receiving apparatus, comprising:

79. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for causing a computer to execute the Msg3 transmitting method of any one of claims 1 to 19 or to execute the Msg3 receiving method of any one of claims 20 to 38.