WO2023155594A1

WO2023155594A1 - Msg3 sending method and apparatus, msg3 receiving method and apparatus, and device and readable storage medium

Info

Publication number: WO2023155594A1
Application number: PCT/CN2022/141057
Authority: WO
Inventors: 费永强; 高雪娟
Original assignee: 大唐移动通信设备有限公司
Priority date: 2022-02-18
Filing date: 2022-12-22
Publication date: 2023-08-24
Also published as: CN116684043A

Abstract

Disclosed in the present disclosure are a Msg3 sending method and apparatus, a Msg3 receiving method and apparatus, and a device and a readable storage medium. The Msg3 sending method comprises: according to a predefined rule and/or an indication of a network device, determining an uplink beam of an initially transmitted Msg3 or of a re-transmitted Msg3; and sending the initially transmitted Msg3 by means of the uplink beam of the initially transmitted Msg3, or sending the re-transmitted Msg3 by means of the uplink beam of the re-transmitted Msg3.

Description

Msg3 sending method, Msg3 receiving method, device, equipment and readable storage medium

Cross References to Related Applications

This application claims priority to Chinese Patent Application No. 202210149584.3 filed in China on February 18, 2022, the entire contents of which are hereby incorporated by reference.

technical field

The disclosure belongs to the technical field of communication, and in particular relates to a message 3 (Msg3) sending method, a Msg3 receiving method, a device, a device, and a readable storage medium.

Background technique

In related technologies, the base station may instruct/schedule the terminal to repeatedly send a physical random access channel (Physical Random Access Channel, PRACH). The beams for repeatedly sending the PRACH may be the same or different. In addition, the base station may also instruct/schedule the terminal to repeatedly send the Msg3 physical uplink shared channel (Physical Uplink Shared Channel, PUSCH). Msg3 bears the RRC establishment request message, and its coverage performance directly affects the success probability of random access. The number of repetitions of PRACH and the number of repetitions of Msg3 PUSCH may be the same or different.

For Msg3, specifically, it can be divided into Msg3 for initial transmission and Msg3 for retransmission. The initial Msg3 is scheduled by the base station through the random access response (Random Access Response, RAR) information in Msg2, and the retransmitted Msg3 is the Temporary Cell-Radio Network Temporary Identifier (Temporary Cell-Radio Network Temporary Identifier, TC) temporarily used by the gNB. -RNTI) scrambled downlink control information (Downlink Control Information, DCI) scheduling. Among them, the concepts of repeated transmission (repetition) and retransmission (retransmission) are not the same. Repeated transmission of Msg3 means that the base station schedules the terminal to transmit Msg3 once, and the terminal transmits multiple Msg3 PUSCHs; retransmission of Msg3 means that after the base station schedules Msg3 for the first time, (for example, because the base station did not correctly demodulate the previous transmission Msg3) Schedule the terminal to transmit Msg3 again. Wherein, both the initially transmitted Msg3 and the retransmitted Msg3 may be repeatedly transmitted.

Currently, although the base station can instruct/schedule the terminal to repeatedly send the Msg3 PUSCH, the base station does not instruct/schedule the uplink beam of Msg3. Therefore, the beam that the terminal sends Msg3 is determined by its own implementation, and the base station cannot determine the sending beam of Msg3, so it is also difficult to select a suitable receiving beam to receive Msg3, resulting in a decrease in coverage performance. How to determine the uplink beam of Msg3 is an urgent problem to be solved.

Contents of the invention

The embodiments of the present disclosure provide a method for sending Msg3, a method for receiving Msg3, a device, a device, and a readable storage medium, which can solve the problem of how to determine the uplink beam of Msg3.

In the first aspect, a method for sending Msg3 is provided, which is applied to a terminal, including:

Determine the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules and/or instructions of network equipment;

Sending the initial transmission Msg3 through the uplink beam of the initial transmission Msg3, or sending the retransmission Msg3 through the uplink beam of the retransmission Msg3.

Optionally, in the case of determining the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules, the predefined rules include one or more of the following:

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

The uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3 is determined according to the physical random access channel PRACH sent when the terminal initiates random access.

Optionally, the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access, including:

In the case that the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and all The uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same;

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is based on the SSB selected when the terminal initiates random access, and the network device actually sends One or more of the SSBs are determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partly different.

Optionally, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to one or more of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, including :

According to one or more items of the SSB selected when the terminal initiates random access, and the cyclic sequence of the SSB actually sent by the network device, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the repeated The SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 is determined, and the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined;

or,

According to the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3 One or more of them, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission, and then determine the repeated transmission of the initial transmission Msg3 according to the SSB corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 Or retransmit the uplink beam of Msg3.

Optionally, the uplink beam for the initial transmission or retransmission of Msg3 is determined according to the PRACH sent when the terminal initiates random access, including:

When the PRACH sent when the terminal initiates random access is non-repeated transmission, or when the PRACH sent when the terminal initiates random access is repeated transmission and the uplink beams of each PRACH are the same, the initial The uplink beam for transmitting Msg3 or retransmitting Msg3 is the same as the uplink beam of the PRACH;

or,

When the PRACH sent when the terminal initiates random access is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is non-repeated transmission, the initial transmission Msg3 or retransmission The uplink beam for transmitting Msg3 is the same as the predefined PRACH uplink beam;

or,

When the PRACH sent when the terminal initiates random access is a repeated transmission and the uplink beams of the PRACHs for each repeated transmission are at least partially different, and the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the repeated transmission The uplink beams of the initial transmission of Msg3 or retransmission of Msg3 are determined according to the uplink beams of the PRACH for repeated transmission, and the uplink beams of the initial transmission of Msg3 or retransmission of Msg3 of each repeated transmission are the same or at least partly different.

Optionally, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is determined according to the uplink beam of the PRACH of the repeated transmission, including:

Determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 according to one or more of the first PRACH uplink beam and the cyclic sequence of the repeated transmission of the PRACH uplink beam, and then according to the repeated transmission of the initial transmission Msg3 Or retransmit the PRACH corresponding to Msg3, and determine the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 for repeated transmission;

or,

According to one or more of the relationship between the uplink beam of the first PRACH, the cyclic sequence of the uplink beam of the repeated transmission PRACH, and the number of PRACHs and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, determine repeated transmission The PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the PRACH corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3.

Optionally, the predefined rule agreement or the instruction of the network device is used to indicate: according to the uplink beam of the initial transmission of the Msg3, determine the uplink beam for the retransmission of the Msg3.

Optionally, the determining the uplink beam for retransmitting Msg3 according to the uplink beam for initially transmitting Msg3 includes:

In the case that the initially transmitted Msg3 is a non-repeated transmission, or the initially transmitted Msg3 is a repeated transmission and the uplink beam of the initially transmitted Msg3 is the same, the retransmitted Msg3's uplink beam is the same as the initially transmitted Msg3 The uplink beams are the same;

or,

When the initially transmitted Msg3 is repeated transmission, and the uplink beams of the initially transmitted Msg3 are at least partly different, determine the uplink beam of the retransmitted Msg3 according to the determination manner of the initially transmitted uplink beam of the Msg3.

Optionally, in the case of determining the uplink beam for the initial transmission of Msg3 according to the indication of the network equipment, the indication of the network equipment includes one or more of the following:

Random access response RAR information;

Scheduling the downlink control information DCI of the RAR;

system information;

Wherein, the RAR information, DCI or system message for scheduling RAR is used to indicate any of the following:

One or more references to the SSB's index;

Index of one or more references to PRACH.

Optionally, in the case that the uplink beam for retransmitting Msg3 is determined according to the instruction of the network device, the instruction of the network device includes DCI scrambled by the temporarily used cell radio network temporary identity TC-RNTI;

Wherein, the DCI scrambled by the TC-RNTI is used to indicate any of the following:

One or more references to the SSB's index;

one or more references to PRACH;

Indexes of one or more uplink beams referring to the initial transmission Msg3.

In the second aspect, a method for receiving Msg3 is provided, which is applied to network equipment, including:

Determine the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules; and/or, indicate to the terminal the uplink beam for initial transmission of Msg3 or retransmission of Msg3;

Receive the initial transmission Msg3, or receive the retransmission Msg3;

Optionally, the initial transmission Msg3 is received through a receiving beam corresponding to the uplink beam of the initial transmission Msg3, or the retransmission Msg3 is received through a receiving beam corresponding to the uplink beam of the retransmission Msg3.

The uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access;

The uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3 is determined according to the PRACH sent when the terminal initiates random access.

or,

When the initial transmission of Msg3 or retransmission of Msg3 is repeated transmission, the uplink beam of the initial transmission of Msg3 or retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access, and all repeated transmissions The uplink beams of the initial transmission or retransmission of Msg3 are the same;

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is based on the SSB selected when the terminal initiates random access and the actual One or more of the sent SSBs are determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partly different.

Optionally, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, including:

or,

Optionally, the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the PRACH sent when the terminal initiates random access, including:

When the PRACH is non-repeated transmission, or when the PRACH is repeated transmission and the uplink beams of each PRACH are the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH;

or,

When the PRACH is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission or retransmission of Msg3 is non-repetitive transmission, the initial transmission of Msg3 or retransmission of Msg3 The uplink beam of the predefined PRACH Uplink beams are the same;

or,

When the PRACH is repeated transmission and the uplink beams of each PRACH are at least partly different, and the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 The uplink beam is based on the repetition The uplink beam of the transmitted PRACH is determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of each repeated transmission are the same or at least partly different.

Determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 according to the cyclic order of the uplink beams of the repeatedly transmitted PRACH, and then determine the repeated transmission according to the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 The uplink beam for initial transmission of Msg3 or retransmission of Msg3;

or,

According to the cyclic order of the uplink beams of the repeated transmission of PRACH, and one or more of the relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, determine the initial transmission Msg3 or retransmission of the repeated transmission The PRACH corresponding to Msg3, and then according to the PRACH corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3.

Optionally, the determining the uplink beam for retransmitting Msg3 according to a predefined rule includes:

The uplink beam for retransmitting Msg3 is determined according to the uplink beam for initially transmitting Msg3.

or,

When the initially transmitted Msg3 is repeated transmission, and the uplink beams of the initially transmitted Msg3 are at least partly different, according to the determination method of the initially transmitted Msg3 uplink beam, determine the retransmitted Msg3 uplink beam

Optionally, indicating to the terminal the uplink beam of the initial transmission of Msg3, including:

Through one or more items of RAR information, DCI for scheduling RAR, and system information, indicate to the terminal the uplink beam for initially transmitting Msg3;

Wherein, the RAR information, DCI or system message for scheduling RAR is used to indicate any of the following: one or more reference SSB indexes, or one or more reference PRACH indexes.

Optionally, instructing the terminal to retransmit the uplink beam of Msg3 includes:

Instruct the terminal to retransmit the uplink beam of Msg3 through the TC-RNTI scrambled DCI;

One or more references to the SSB's index;

one or more references to PRACH;

Indexes of one or more uplink beams referring to the initial transmission Msg3.

In a third aspect, a device for sending Msg3 is provided, which is applied to a terminal, including:

The first processing module is configured to determine the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules and/or instructions of network equipment;

The first sending module is configured to send the initial transmission Msg3 through the uplink beam of the initial transmission Msg3, or send the retransmission Msg3 through the uplink beam of the retransmission Msg3.

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is based on the SSB selected when the terminal initiates random access, and the network device actually sends One or more of the SSBs are determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partly different.

According to one or more items of the SSB selected when the terminal initiates random access, and the cyclic sequence of the SSB actually sent by the network device, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the repeated The SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 is determined, and the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 is determined;

or,

In the fourth aspect, a device for receiving Msg3 is provided, which is applied to network equipment, including:

The second processing module is configured to determine the uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3 according to predefined rules; and/or, indicate to the terminal the uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3;

The first receiving module is configured to receive the initial transmission Msg3, or receive the retransmission Msg3.

or,

In a fifth aspect, a communication device is provided, including: a processor, a memory, and a program stored on the memory and operable on the processor, and when the program is executed by the processor, the first aspect is implemented. Or the steps of the method described in the second aspect.

According to a sixth aspect, a readable storage medium is provided, where a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the steps of the method described in the first aspect or the second aspect are implemented.

In a seventh aspect, there is provided a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or an instruction, so as to implement the process described in the first aspect or the second aspect. steps of the method described above.

In an eighth aspect, a computer program product is provided, the computer program product is stored in a non-volatile storage medium, and the computer program product is executed by at least one processor to implement the above described in the first aspect or the second aspect steps of the method.

In the embodiment of the present disclosure, without increasing the indication overhead, the network device can determine the uplink beam of the initial transmission or retransmission of Msg3 sent by the UE, so that a more suitable receiving beam can be used to receive the initial transmission or retransmission of Msg3 , or the network device can flexibly instruct the UE to transmit the uplink beam for the initial transmission or retransmission of Msg3 according to the needs, so that the most suitable receiving strategy can be selected when receiving Msg3, such as combining or joint detection, or increasing the beam diversity gain, thereby improving Coverage performance for Msg3.

Description of drawings

Figure 1 is a schematic diagram of 4-step RACH;

FIG. 2 is a schematic diagram of an application scenario of an embodiment of the present disclosure;

FIG. 3 is a flowchart of a method for sending Msg3 provided by an embodiment of the present disclosure;

FIG. 4 is a flowchart of a method for receiving Msg3 provided by an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of the UE determining the uplink beam of Msg3 according to the SSB provided by an embodiment of the present disclosure;

Fig. 6 is a schematic diagram of multiple Msg3 beams that are repeatedly sent provided by an embodiment of the present disclosure, where N<M and is an integer multiple;

Fig. 7 is a schematic diagram of multiple Msg3 beams that are repeatedly sent provided by an embodiment of the present disclosure, where N<M and not necessarily an integer multiple;

FIG. 8 is a schematic diagram of multiple Msg3 beams that are repeatedly sent provided by an embodiment of the present disclosure, where N>M is an integer multiple;

Fig. 9 is a schematic diagram of multiple Msg3 beams that are repeatedly sent provided by an embodiment of the present disclosure, where N>M and not necessarily an integer multiple;

FIG. 10 is a schematic diagram of an Msg3 sending device provided by an embodiment of the present disclosure;

FIG. 11 is a flow chart of a device for receiving Msg3 provided by an embodiment of the present disclosure;

Fig. 12 is a schematic diagram of a communication device provided by an embodiment of the present disclosure.

Detailed ways

The following will clearly describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, but not all of the embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present disclosure belong to the protection scope of the present disclosure.

The terms "first", "second" and the like in the specification and claims of the present disclosure are used to distinguish similar objects, and are not used to describe a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the present disclosure are capable of practice in sequences other than those illustrated or described herein and that "first" and "second" distinguish objects. It is usually one category, and the number of objects is not limited. For example, there may be one or more first objects. In addition, "and/or" in the description and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

The beam in this article can also be described as a spatial filter (spatial filter) or spatial relation information (spatial relation information), for example, the uplink beam when the terminal transmits is called the uplink spatial filter, or the downlink beam when the base station transmits is called Downlink spatial correlation information and so on. Accordingly, similar descriptions may be considered equivalent.

In order to facilitate the understanding of the technical solution of the present disclosure, the following technical points are introduced below:

In the fifth generation mobile communication technology (5th Generation, 5G) new air interface (New Radio, NR) system, with the increase of the deployment frequency of the wireless system, the propagation loss of the wireless signal is aggravated, resulting in the shortening of the signal transmission distance and the network Overlay performance is degraded. Especially for the uplink transmission, that is, the transmission sent by the user equipment (UE) and received by the base station (next generation Node B, gNB), since the transmission power of the UE is low, the coverage of the uplink channel is wider than that of the downlink channel. is restricted.

Message 3 (Message 3, Msg3) is an important uplink channel in the four-step random access (4-step RACH) process, and it carries the radio resource control (Radio Resource Control, RRC) establishment request message sent by the UE. A 4-step RACH process is shown in Figure 1.

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

Step 1: The UE selects a target synchronization signal block (Synchronization Signal and PBCH block, SSB) (such as the SSB whose measurement reference signal received power (Reference Signal Received Power, RSRP) of the target SSB is greater than a certain threshold value);

Step 2: According to the RACH configuration information, the UE sends a message 1 (Msg1) (Physical Random Access Channel (PRACH)) in the random access opportunity (Rach Occasion, RO) associated with the selected SSB;

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

Step 4: UE sends message 3 (Msg3) according to the instruction of RAR;

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

It can be seen that whether the gNB can correctly receive the Msg3 sent by the UE is directly related to whether the UE can successfully access the cell, so the coverage performance of the Msg3 is particularly important. For UEs located in areas with large fading such as cell edges or basements, the transmission loss of wireless signals (such as Msg3) is large, so coverage enhancement is required for them.

Msg3 of version 15 (Release 15, Rel-15) and version 16 (Release 16, Rel-16) does not support repeated transmission. In order to improve the coverage performance of Msg3, the NR of Release 17 (Rel-17) supports the repeated transmission of Msg3. Further, in Release 18 (Release 18, Rel-18), message 1 (Msg1), that is, repeated transmission of PRACH, will be further supported.

For the base station and UE of Rel-18NR, the base station can instruct/schedule the UE to repeatedly transmit the PRACH; the beams for the repeated transmission of the PRACH may be the same or different. In addition, the base station may also instruct/schedule the UE to repeatedly send Msg3. The repetition times of the PRACH and the repetition times of the Msg3 uplink physical shared channel (Physical Uplink Shared Channel, PUSCH) may be the same or different.

At present, the protocol does not specify how the UE determines the uplink beam for initial transmission or retransmission of Msg3.

For the base station, since the uplink beam of the initial transmission or retransmission of Msg3 repeated by the UE is uncertain, the performance that the base station can improve when receiving Msg3 is low:

(1) Since the uplink beams of each Msg3 in the initial transmission or retransmission of repeated transmission may be different, the base station cannot first combine the signals between the Msg3s and then demodulate them. It can only demodulate each Msg3 PUSCH separately. Lift small;

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

The embodiments of the present disclosure can be applied to 5G NR systems, including network devices and terminals. It can be understood that the embodiments of the present disclosure can also be applied to other systems, such as 6G systems, as long as the terminal needs to repeatedly send the data in the initial access process channel.

Referring to FIG. 2 , an illustration is given for the applicable scenarios of the embodiments of the present disclosure. Multiple UEs including UE1 and UE2 initiate random access to the base station to apply for a wireless network connection service; the base station receives a random access request from at least one UE and provides wireless services for it. Data interaction and transmission are performed between the base station and UE1 and UE2 through wireless communication.

Referring to FIG. 3 , an embodiment of the present disclosure provides a method for sending a Msg3. The subject of the method may be a terminal, and the specific steps include: step 301 and step 302 .

Step 301: Determine the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules and/or instructions of network equipment;

Msg3 in this article can also be replaced by Msg3 PUSCH, that is, the initial transmission of Msg3 can be replaced by the initial transmission of Msg3 PUSCH, and the retransmission of Msg3 can be replaced by the retransmission of Msg3 PUSCH.

Step 302: Send the initial transmission Msg3 through the uplink beam of the initial transmission Msg3, or send the retransmission Msg3 through the uplink beam of the retransmission Msg3.

In an embodiment of the present disclosure, the terminal may determine whether to initially transmit Msg3 or to retransmit Msg3 according to a predefined rule and/or an indication of a network device (for example, the indication of the network device may be explicit signaling or implicit signaling). In this way, the terminal can determine the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3, and the network device (such as a base station) can also select an appropriate detection scheme according to the determined uplink beam of Msg3, thereby improving the detection performance of Msg3 and further improving Coverage performance of network equipment.

In an embodiment of the present disclosure, in the case of determining the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules, the predefined rules include one or more of the following:

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

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

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

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

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

Rule 1-b1) In the case where the initial Msg3 transmission or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, And the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of all repeated transmissions are the same;

That is, the beams of the initial transmission Msg3 or the retransmission Msg3 of all repeated transmissions are the same, and are all determined according to the SSB selected when the UE initiates random access.

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

That is, the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of repeated transmission may be different, and the multiple repeated transmissions of the initial transmission Msg3 or Msg3 are determined according to the SSB selected when the UE initiates random access and the SSB actually sent by the network device. Retransmit the uplink beam of Msg3.

Optionally, in the above rule 1-b2, at least one of the following is further included:

Rule 1-b2-1) According to one or more items of the SSB selected when the terminal initiates random access, and the cyclic order of the SSB actually sent by the network device, determine the initial transmission Msg3 or the retransmission Msg3 corresponding to SSB, and then according to the SSB corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3;

Rule 1-b2-2) According to the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the number of SSBs actually sent by the network device and the initial Msg3 or retransmission One or more items in the relationship between the number of repetitions of Msg3, determine the SSB corresponding to the initial Msg3 or retransmission Msg3 of the repeated transmission, and then determine the repetition according to the SSB corresponding to the initial Msg3 or retransmission Msg3 of the repeated transmission The uplink beam of the initial transmission Msg3 or the retransmission Msg3 is transmitted.

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

Rule 2-a) In the case of non-repeated transmission of PRACH, or in the case of repeated transmission of PRACH and the uplink beam of each PRACH is the same, the uplink beam of the initial transmission Msg3 or retransmission Msg3 is the same as the uplink beam of PRACH ;

That is, if the PRACH is non-repeated transmission, or the PRACH is repeated transmission and the uplink beams of each PRACH are the same, then the (repeated or non-repeated transmission) uplink beam for the initial transmission of Msg3 or retransmission of Msg3 is the same as the uplink beam of the PRACH.

Rule 2-b) When the PRACH is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or the retransmission Msg3 is non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 The same as the uplink beam of the predefined PRACH (for example, the first PRACH);

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

Wherein, the uplink beams of the PRACHs that are repeatedly transmitted are at least partially different, including but not limited to, the uplink beams of any one PRACH are different from the uplink beams of other PRACHs.

Rule 2-c) When the PRACH is repeated transmission and the uplink beams of the repeated PRACHs are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is repeated transmission, the repeated transmission of the initial transmission Msg3 or retransmission The uplink beam for transmitting the Msg3 is determined according to the uplink beam of the repeated transmission of the PRACH, and the uplink beams for the initial transmission of the Msg3 or the retransmission of the Msg3 for each repeated transmission are the same or at least partly different.

That is, the PRACH is repeated transmission and the uplink beams of each PRACH are different, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission may be different, which are determined by the uplink beams of the repeated transmission of the PRACH.

Optionally, in the above rule 2-c, at least one of the following is further included:

Rule 2-c-1) Determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 according to the cyclic sequence of the uplink beams of the repeated transmission of the PRACH, and then determine the PRACH corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 , determining the uplink beam of the initial transmission Msg3 or the retransmission Msg3 for repeated transmission;

Rule 2-c-2) According to one or more of the relationship between the cyclic order of the uplink beams of the PRACH for repeated transmission and the number of PRACHs and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, determine the repeated transmission The PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the PRACH corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3.

In an embodiment of the present disclosure, the determining the uplink beam for retransmitting Msg3 according to a predefined rule and/or an instruction of a network device includes:

That is, according to the predefined rules, it may be stipulated that the uplink beam for retransmitting Msg3 is determined based on the uplink beam for initial transmission of Msg3, or the network device may indicate that the uplink beam for retransmitting Msg3 is determined based on the uplink beam for initial transmission of Msg3.

In an embodiment of the present disclosure, the determining the uplink beam for retransmitting Msg3 according to the uplink beam for initially transmitting Msg3 includes one of the following:

Mode 1) When the initially transmitted Msg3 is non-repeated transmission, or the initial transmitted Msg3 is repeated transmission and the uplink beam of the initially transmitted Msg3 is the same, the retransmitted Msg3 uplink beam and The uplink beams of the initial transmission of Msg3 are the same;

Method 2) In the case that the initially transmitted Msg3 is repeated transmission, and the uplink beams of the initially transmitted Msg3 are at least partially different, according to the determination method of the initially transmitted Msg3 uplink beam, determine the retransmitted Msg3 uplink beam.

That is, the method for determining the uplink beam for the retransmission of Msg3 may be the same as the method for determining the uplink beam for the initial transmission of Msg3.

In an embodiment of the present disclosure, in the case of determining the uplink beam for initial transmission of Msg3 according to the indication of the network equipment, the indication of the network equipment includes one or more of the following:

(1) Random Access Response (Random Access Response, RAR) information;

(2) Downlink Control Information (DCI) of scheduling RAR;

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

In an implementation manner of the present disclosure, the RAR information, the DCI for scheduling RAR, or a system message (for example, system information block 1) is used to indicate any of the following:

(1) one or more reference SSB indexes;

(2) One or more indexes referring to PRACH.

In an embodiment of the present disclosure, when the uplink beam for retransmitting Msg3 is determined according to the instruction of the network device, the instruction of the network device includes a Temporary Cell-Radio Network Temporary Identifier (Temporary Cell-Radio Network Temporary Identifier, TC-RNTI) scrambled DCI.

In an implementation manner of the present disclosure, the TC-RNTI scrambled DCI is used to indicate any of the following:

(1) one or more reference SSB indexes;

(2) One or more reference PRACH indexes;

(3) Indexes of one or more uplink beams referring to the initial transmission Msg3.

Referring to FIG. 4 , an embodiment of the present disclosure provides a method for receiving Msg3. The execution body of the method includes a network device, such as a base station. The specific steps include: step 401 and step 402 .

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

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

It can be understood that the network device may receive the initial transmission Msg3 or the retransmission Msg3 through the receiving beam corresponding to the uplink beam of the initial transmission Msg3 or the retransmission Msg3. In an embodiment of the present disclosure, in the case of determining the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules, the predefined rules include one or more of the following:

In an embodiment of the present disclosure, the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access, including:

or,

In an embodiment of the present disclosure, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, including:

According to the SSB selected when the terminal initiates random access, and the cyclic sequence of the SSB actually sent by the network device, determine the SSB corresponding to the initial transmission Msg3 or retransmission Msg3, and then according to the repeated transmission of the initial transmission Msg3 or retransmission Transmit the SSB corresponding to Msg3, and determine the uplink beam of the initial transmission Msg3 or retransmission Msg3 for repeated transmission;

or,

In an embodiment of the present disclosure, the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the PRACH sent when the terminal initiates random access, including:

or,

In an embodiment of the present disclosure, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the uplink beam of the PRACH for repeated transmission, including:

or,

In an implementation manner of the present disclosure, the determining the uplink beam for retransmitting Msg3 according to a predefined rule includes:

In an embodiment of the present disclosure, the determining the uplink beam for retransmitting Msg3 according to the uplink beam for initially transmitting Msg3 includes:

or,

In an embodiment of the present disclosure, indicating to the terminal the uplink beam of the initial transmission of Msg3 includes:

Through one or more of RAR information, DCI and SI for scheduling RAR, indicate to the terminal the uplink beam for initial transmission of Msg3.

In an embodiment of the present disclosure, the RAR information, DCI or SI for scheduling RAR is used to indicate any of the following: (1) one or more reference SSB indexes, or, (2) one or more Refer to PRACH Index.

In an embodiment of the present disclosure, instructing the terminal to retransmit the uplink beam of Msg3 includes:

The DCI scrambled by the TC-RNTI is used to instruct the terminal to retransmit the uplink beam of Msg3.

(1) one or more reference SSB indexes;

(2) One or more reference PRACH indexes;

Embodiments of the present disclosure are described below through Embodiment 1, Embodiment 2, Embodiment 3 and Embodiment 4.

Example 1

This embodiment introduces that the uplink beam for initial transmission of Msg3 is determined by a predefined rule.

The first type of method in this embodiment is mainly related to SSB. The uplink beam for the initial transmission of Msg3 may be determined according to the SSB selected when the UE initiates random access and a predefined rule.

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

In this case, the uplink beam for initially transmitting Msg3 may be determined according to the SSB selected when the UE initiates random access.

For example, according to the reciprocity of the wireless communication channel, the best beam for receiving the SSB may be used as the uplink beam for sending the initial transmission Msg3.

See Figure 5, where the base station sends a total of 4 SSBs (SSB0, SSB1, SSB2, SSB3), and the UE has 3 receive beam beams (Rx beam 0, Rx beam 1, Rx beam 2); UE selects SSB 1 as the target SSB Initiate random access. Among the three receive beams, when UE uses Rx beam 1 to receive SSB, the signal strength is the highest and the performance is the best. Therefore, UE uses the uplink beam or transmit beam corresponding to Rx beam 1 as the uplink beam/transmit beam for the initial transmission of Msg3.

Case 1-2: The initial transmission of Msg3 is repeated transmission.

In this case, the uplink beam determination method for the initial transmission of Msg3 includes:

Method 1: The uplink beams of all repeated transmissions of Msg3 are the same, and are all determined according to the SSB selected when the UE initiates random access (method 1 in case 1-2 is the same as the above case 1-1, that is, according to the UE-initiated The SSB selected during random access determines the uplink beam for the initial transmission of Msg3);

Method 2: According to one or more of the SSB selected when the UE initiates random access and the SSB actually sent by the base station, determine the uplink beam for the initial transmission of Msg3 for repeated transmission;

Specifically, for the first initial transmission of Msg3, you can refer to the method in Case 1-1 in Method 1, and determine the uplink beam of the first initial transmission of Msg3 according to the SSB selected when the UE initiates random access; except for the first initial transmission of Msg3 , the other initial transmission Msg3 may be sequentially associated and determined according to the sequence of the SSB selected during random access and the cyclic index sequence of the SSB actually sent by the base station.

Wherein, the sequence of the cyclic index of the SSB actually sent by the base station may represent the cyclic sequence of the SSB actually sent by the network device.

For example, taking Fig. 5 as an example, the sequence of the cyclic index of the base station actually sending the SSB is 0-1-2-3-0-1-2-3...; SSB1 determines the uplink beam, then the SSB corresponding to the subsequent initial transmission Msg3 needs to be sequentially associated from SSB1, that is, the second initial transmission Msg3 (Msg3 1 in the figure) determines the uplink beam according to SSB2, and the third initial transmission Msg3 (Figure Msg3 in 2) determines the uplink beam according to SSB3, the fourth initial transmission Msg3 (Msg3 3 in the figure) determines the uplink beam according to SSB0, and the fifth initial transmission Msg3 (Msg3 4 in the figure) determines the uplink beam according to SSB1,... …and so on.

For another example, the uplink beam of the initial transmission Msg3 that is repeatedly transmitted can be determined according to the SSB actually sent by the base station, and the sequence of the cyclic index for the SSB actually sent by the base station is 0-1-2-3-0-1-2-3..., then The 1st, 2nd...K initial transmission Msg3 determines the uplink beam according to the 1st, 2nd...K indexes of the cyclic index sequence 0-1-2-3-0-1-2-3...; that is, the first The initial transmission Msg3 determines the uplink beam according to SSB0, the second initial transmission Msg3 determines the uplink beam according to SSB1, ..., and so on.

Method 3: Determine multiple repeated transmissions according to one or more of the SSB selected when the UE initiates random access, the SSB actually sent by the base station, the number of SSBs actually sent by the base station, and the number of repetitions of the initial Msg3 transmission The uplink beam of the initial transmission of Msg3.

Specifically, it is necessary to determine the SSB corresponding to the repeated transmission of the initial transmission Msg3 according to the relationship between the number N of SSBs actually sent by the base station and the number of repetitions M of the initial transmission Msg3, and then determine the uplink beam of the repeated transmission of the initial transmission Msg3 according to the corresponding SSB .

(1) If M=N, the repeated initial transmission Msg3 corresponds to the SSB one by one; the first initial transmission Msg3 determines its uplink beam according to the SSB selected during random access, and the other Msg3 are based on the cyclic index of the SSB actually sent by the base station The sequence determines the SSB, and then determines the uplink beam for the initial transmission of Msg3 according to the SSB;

(2) If N≤M, that is, the number of SSBs is less than or equal to the number of repetitions of the initial Msg3 transmission, in this case, each SSB corresponds to multiple Msg3s; the SSB corresponding to the first Msg3 is the SSB selected by the UE during random access , and the corresponding relationship between other Msg3 and SSB is determined according to the sequence of the cyclic index of the SSB actually sent by the base station, and the SSB index selected by the UE during random access as the starting index for sequential association determination, where:

a) If the relationship between M and N must be an integer multiple, each SSB corresponds to M/N Msg3, and different SSBs correspond to different sets of Msg3, as shown in Figure 6.

For example, SSB0 in the figure corresponds to Msg3 4 and Msg3 5, SSB1 corresponds to Msg3 0 and Msg3 1, and SSB2 corresponds to Msg3 2 and Msg3 3.

b) If it is allowed that the relationship between M and N does not have to be an integer multiple, then the previous

SSB corresponding to

Msg3, after

SSB corresponding to

Msg3, different SSBs correspond to different Msg3 sets, as shown in Figure 7.

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

(3) If N≥M, that is, the number of SSBs is greater than or equal to the number of repetitions of the initial transmission Msg3, in this case, each Msg3 corresponds to multiple SSBs; the SSB corresponding to the first Msg3 is the SSB selected by the UE according to random access , and the corresponding relationship between other Msg3 and SSB is determined according to the sequence of the cyclic index of the SSB actually sent by the network device, and the SSB index selected by the UE during random access as the starting index for sequential association determination, where:

a) If it is stipulated that the relationship between N and M must be an integer multiple, then each Msg3 corresponds to N/M SSBs, and the SSB sets corresponding to different Msg3s are different, as shown in FIG. 8 .

For example, SSB1 and SSB2 in the figure correspond to Msg3 0, and SSB3 and SSB0 correspond to Msg3 1.

b) If it is allowed that the relationship between N and M does not have to be an integer multiple, you can proceed

corresponding to Msg3

SSB, after

corresponding to Msg3

SSBs, different Msg3s correspond to different SSB sets, as shown in Figure 9.

For example, SSB1 and SSB2 in the figure correspond to Msg3 0, and SSB0 corresponds to Msg3 1.

From the perspective of the uplink beam for sending Msg3, since the optimal receiving beam for each SSB may be different, the uplink beam for Msg3 corresponding to different SSBs may also be different. If one Msg3 corresponds to multiple SSBs above, the UE may select one of the corresponding multiple SSBs to determine the uplink beam when sending the Msg3.

The second type of method in this embodiment is mainly related to PRACH. The uplink beam for initially transmitting Msg3 is determined according to the uplink beam of the PRACH sent by the UE and a predefined rule.

Case 2-1: The PRACH is non-repeated transmission, or the PRACH is repeated transmission and the uplink beams of each PRACH are the same.

In this case, if the initial transmission of Msg3 is a non-repeated transmission, its uplink beam is the same as that of the PRACH; if the initial transmission of Msg3 is a repeated transmission, the uplink beams of all repeated transmissions of the initial transmission of Msg3 are the same as the uplink beam of the PRACH same. That is, no matter whether Msg3 is repeated transmission or not, its uplink beam is the same as the uplink beam of PRACH.

Case 2-2: PRACH is repeated transmission and the uplink beams of the repeated PRACHs are different, but the initial transmission of Msg3 is non-repetitive transmission.

The uplink beams for the repeated transmission of the PRACHs are different, and it can also be considered that each PRACH corresponds to a different SSB. In this case, the uplink beam of the initial transmission of Msg3 is the same as the uplink beam of a predefined PRACH.

For example, the predefined PRACH may be the first PRACH among multiple PRACHs that are repeatedly transmitted. The predefined PRACH may also be a PRACH that can be uniquely determined in other ways.

Case 2-3: PRACH is repeated transmission and the uplink beams of the repeated PRACHs are different, and the initial transmission of Msg3 is also repeated transmission.

It can be understood that, in Case 2-3, you can refer to Method 2 and Method 3 in Case 1-2, and replace the "SSB selected when UE initiates random access" in Method 2 and Method 3 in Case 1-2 with Replace "the first PRACH" and "the SSB actually sent by the base station" with "repeatedly transmitted PRACH".

The specific description is as follows:

Method 1: According to one or more of the first uplink beam of the PRACH and the cyclic order of the uplink beams of the retransmitted PRACH, determine the uplink beam of the retransmitted initial Msg3.

Specifically, for the first initial transmission of Msg3, the method in case 1-1 can be referred to, and the uplink beam of the initial transmission of Msg3 can be determined according to the uplink beam of the first PRACH; It may be determined according to the uplink beam of the first PRACH, the cyclic order of the uplink beams of the retransmitted PRACH, and the relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3.

Method 2: According to one or more of the relationship between the uplink beam of the first PRACH, the cyclic order of the uplink beams of the repeatedly transmitted PRACH, and the number of PRACHs and the number of repetitions of the initial transmission Msg3, determine the initial number of multiple repeated transmissions. The uplink beam of Msg3.

Specifically, it is necessary to determine the PRACH corresponding to the repeated transmission of the initial transmission Msg3 according to the relationship between the number N of the repeated transmission of the PRACH and the number of repetitions M of the initial transmission of the Msg3, and then determine the uplink beam of the initial transmission of the Msg3 according to the corresponding PRACH.

(1) If M=N, then the initial transmission Msg3 of the repeated transmission corresponds to the PRACH one by one; the first initial transmission Msg3 determines the beam according to the first PRACH, and the other Msg3 determine the PRACH according to the cyclic order of the uplink beams of the repeated transmission of the PRACH, and Determine the uplink beam for the initial transmission of Msg3 according to the PRACH;

(2) If N≤M, that is, the number of PRACHs is less than or equal to the number of repetitions of the initial Msg3 transmission, in this case, each PRACH corresponds to multiple Msg3s; the PRACH corresponding to the first Msg3 is the first PRACH, and the other Msg3s and PRACH The corresponding relationship is based on the cyclic order of the uplink beams of the PRACH (that is, the sequence of the cyclic indexes of the uplink beams of the PRACH), and the index of the uplink beam of the PRACH selected by the UE during random access is used as the starting index, and the sequential association is determined. ,in:

a) If the relationship between M and N must be an integer multiple, each PRACH corresponds to M/N Msg3, and different PRACHs correspond to different sets of Msg3.

corresponding to each PRACH

Msg3, after

corresponding to each PRACH

Msg3, and different PRACHs correspond to different Msg3 sets.

(3) If N≥M, that is, the number of PRACHs is greater than or equal to the number of repetitions of the initial Msg3, in this case, each Msg3 corresponds to multiple PRACHs; the PRACH corresponding to the first Msg3 is the first PRACH, and the other Msg3 and PRACH The corresponding relationship is determined according to the cyclic order of the uplink beams of the PRACH, and the index of the uplink beam of the PRACH selected by the UE during random access is used as the starting index, and the sequence association is determined, wherein:

a) If it is stipulated that the relationship between N and M must be an integer multiple, each Msg3 corresponds to N/M PRACHs, and different Msg3s correspond to different PRACH sets.

corresponding to Msg3

PRACH, after

corresponding to Msg3

PRACHs, different Msg3s correspond to different PRACH sets.

From the perspective of the uplink beam for sending Msg3, since the optimal receiving beam for each PRACH may be different, the uplink beam for Msg3 corresponding to different PRACHs may also be different. If one Msg3 corresponds to multiple PRACHs above, the UE may select one of the corresponding multiple PRACHs to determine the uplink beam when sending the Msg3.

In this embodiment, without increasing indication overhead, the network device can determine the uplink beam of the initial transmission Msg3 sent by the UE, so that a more suitable receiving beam can be used to receive the initial transmission Msg3. For the case of repeatedly sending the initial Msg3, if the uplink beams of the repeatedly sent Msg3 are the same, the network equipment can perform signal combination first and then demodulate. When the channel changes slowly, the performance is better than demodulating each Msg3 separately; For the situation that the uplink beams of each repeatedly sent Msg3 are different, the network equipment can use the optimal beam to receive and demodulate respectively, and can obtain beam diversity gain and improve coverage performance when the channel changes rapidly.

Example 2

This embodiment introduces that the beam for initial transmission of Msg3 is determined through the instruction of the network device.

In this embodiment, the indication by the network device may be indication information (for example, first indication information), indicating the uplink beam for initially transmitting the Msg3. The first indication information may be carried in the RAR message, or sent in the DCI for scheduling the RAR, or carried in the system message (such as SIB1) and broadcasted.

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

The first indication information may only indicate one SSB, for example, it may indicate an index of an SSB; when it is desired to search for an SSB indicated by the first indication information, the uplink beam for the initial transmission of Msg3 is determined according to the indicated SSB; if Msg3 is repeated transmission, then The uplink beams of the initial transmission Msg3 of all repeated transmissions are the same and are all determined according to the indicated SSB.

Alternatively, the first indication information may also indicate multiple SSBs. This method is applicable to the case where the initial transmission of Msg3 is repeated transmission, and at this time, the uplink beams of each repeated transmission of Msg3 may be different.

For example, the first indication information may indicate the SSBs corresponding to multiple initially transmitted Msg3s through a bitmap (bitmap). Each K bits in the Bitmap is used to indicate which one of the maximum 2 ^K SSBs corresponding to an initial transmission Msg3.

Example 1, when K=2, the four states {00, 01, 10, 11} that can be represented by the bit information in the first indication information correspond to SSB0, SSB1, SSB2, and SSB3 respectively.

Example 2, assuming that an initial transmission Msg3 is repeatedly transmitted 3 times, a total of 2×3=6 bits are required to indicate the SSB corresponding to the initial transmission Msg3. For example, a first instruction message with Bitmap="001110" indicates that the first initial transmission Msg3 corresponds to SSB0 (00), the second initial transmission Msg3 corresponds to SSB3 (11), and the third initial transmission Msg3 corresponds to SSB2 ( 10).

For another example, the first indication information may indicate one of multiple association patterns. The associated pattern refers to the pattern of the repeated transmitted initial Msg3 and its associated SSB. The association style may be predefined, or may also be indicated by the base station through system information broadcast. For example, assuming that an initial Msg3 is repeatedly transmitted 3 times, and there are 4 SSBs (SSB0, SSB1, SSB2, SSB3) in total, several associated styles can be predefined:

pattern1={SSB0-SSB1-SSB2},

pattern2={SSB1-SSB2-SSB3},

pattern3={SSB0-SSB2-SSB0},

....

For example, when the first indication information indicates pattern2, the three initial transmission Msg3 that are repeatedly transmitted are associated with SSB1, SSB2, and SSB3 in sequence, and each initial transmission Msg3 can determine an uplink beam according to its associated SSB.

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

The first indication information may only indicate one PRACH, for example, it may indicate an index of a PRACH; when the first indication information indicates a PRACH, the uplink beam of the initial transmission of Msg3 is determined according to the indicated PRACH; if the initial transmission of Msg3 is repeated transmission, then The uplink beams of the initial transmission Msg3 of all repeated transmissions are the same and are all determined according to the indicated PRACH.

Alternatively, the first indication information may also indicate multiple PRACHs. This method is applicable to the case where the initial transmission of Msg3 is repeated transmission, and at this time, the uplink beams of the initial transmission of Msg3 may be different for each repeated transmission.

For example, the first indication information may indicate the PRACHs corresponding to the multiple initial transmission Msg3 through a bitmap (bitmap). Each K bits in the Bitmap is used to indicate which one of the maximum 2 ^K PRACHs corresponding to an initial transmission Msg3.

Example 1, when K=2, the four states {00, 01, 10, 11} that can be represented by the bit information in the first indication information correspond to PRACH0, PRACH1, PRACH2, and PRACH3 respectively.

Example 2, assuming that an initial transmission Msg3 is repeatedly transmitted 3 times, a total of 2*3=6 bits are required to indicate the PRACH corresponding to the initial transmission Msg3. For example, a first instruction message with Bitmap="001110" indicates that the first initial transmission Msg3 corresponds to PRACH0 (00), the second initial transmission Msg3 corresponds to PRACH3 (11), and the third initial transmission Msg3 corresponds to PRACH2 ( 10).

For another example, the first indication information may indicate one of several association patterns. The associated pattern refers to the pattern of the retransmitted initial Msg3 and its associated PRACH. The association style can be predefined, or indicated by the base station through system information broadcast. For example, suppose a Msg3 is repeatedly transmitted 3 times, and there are 4 PRACHs (PRACH0, PRACH1, PRACH2, PRACH3) and several association patterns can be predefined:

pattern1={PRACH0-PRACH1-PRACH2},

pattern2={PRACH1-PRACH2-PRACH3},

pattern3={PRACH0-PRACH2-PRACH0},

....

For example, when the first indication information indicates pattern2, the three initial transmission Msg3 that are repeatedly transmitted are associated with PRACH1, PRACH2, and PRACH3 in sequence, and each initial transmission Msg3 can determine an uplink beam according to its associated PRACH.

In this case, the beam of each initial transmission Msg3 is the same as the beam of the PRACH associated with it.

Through the method in this embodiment, the base station can flexibly instruct the UE to transmit the uplink beam of the initial transmission Msg3 according to the needs, so that the most suitable receiving strategy can be selected when receiving the initial transmission Msg3, such as combining or joint detection, or increasing the beam diversity gain , thereby improving the coverage performance of Msg3.

It should be noted that the method of this embodiment can also be considered as determining the uplink beam of the PRACH through the combination of "predefined rules" and "instructions from network equipment", that is, through "predefined rules" and "network Device indication" combined with determining the beam for the initial transmission of Msg3.

Example 3

This embodiment introduces that a beam for retransmitting Msg3 is determined by a predefined rule. The retransmission of Msg3 is scheduled through DCI scrambled by the TC-RNTI.

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

However, it should be noted that this only indicates that the (various) methods introduced in Embodiment 1 can be used for both initial transmission of Msg3 and retransmission of Msg3. In the first type of method in Embodiment 3, the uplink beams for retransmitting Msg3 and the uplink beams for initial transmission of Msg3 may be different and independent of each other.

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

In the second type of method in this embodiment, the uplink beam for retransmitting Msg3 is associated with the uplink beam for initial transmission of Msg3. More precisely, the uplink beam for retransmitting Msg3 is the same as the uplink beam for initially transmitting Msg3, or the method for determining the uplink beam for retransmitting Msg3 may be the same as the method for determining the uplink beam for initially transmitting Msg3.

Specifically, the following situations are included:

Case 2-1: The retransmission of Msg3 is not repeated transmission, or the retransmission of Msg3 is repeated transmission and uses the same uplink beam.

In this case, no matter whether the retransmission of Msg3 is repeated transmission or not, the uplink beam of (each retransmission) Msg3 is the same as the uplink beam of the initial transmission of Msg3. When the UE sends the retransmission Msg3, the uplink beam it uses is the same as the uplink beam used when the UE initially transmits the Msg3.

This design is simple to implement, and is especially suitable for scenarios where the UE moves slowly. At this time, generally the UE has used the optimal uplink beam when initially transmitting Msg3, and when the base station schedules the UE to retransmit Msg3, because the UE moves slowly and its position is basically unchanged, the optimal beam may also be It has not changed. At this time, better performance can still be obtained by using the uplink beam for the initial transmission of Msg3 as the uplink beam for retransmission of Msg3.

Case 2-2: The retransmission of Msg3 is repeated and different uplink beams are used.

In this case, multiple repeatedly transmitted Msg3 of retransmitting Msg3 may correspond to different SSBs (for example, through the method in Embodiment 1) or correspond to different PRACHs, so the uplink beams may also be different. In case 2-2, the "determining method" of the uplink beam for the retransmission of Msg3 is the same as the "determining method" of the uplink beam for the initial transmission of Msg3.

For example, the initial transmission of Msg3 is repeated transmission, and multiple uplink beams of Msg3 are determined according to the second method of case 1-2 of Embodiment 1, and each uplink beam may be different; In case 1-2, method 2 determines multiple uplink beams for retransmitting Msg3, and each uplink beam may be different. It should be noted that in this case, only the "determination method" is the same, and it does not mean that the "number of repetitions" is the same. The number of repetitions can be the same or different.

This design is simple to implement, and is especially suitable for scenarios where the UE moves faster. At this time, different uplink beams can be used to obtain higher beam diversity gain, and the uplink beam determination method for the initial transmission of Msg3 and retransmission of Msg3 is the same, on the one hand, the beam diversity gain can be used, and on the other hand, the implementation of network equipment can be simplified , so that the network device can use the same or similar receiving beam adjustment strategy to receive the initial transmission Msg3 and the retransmission Msg3.

It should be noted that other beneficial effects of Embodiment 3 can refer to the effect in Embodiment 1, that is, through the method in this embodiment, the network device can determine the uplink of the retransmission Msg3 sent by the UE without increasing the indication overhead. beam, so that a more suitable receiving beam can be used to receive the retransmitted Msg3. For the situation of repeatedly sending and retransmitting Msg3, if the uplink beams of each repeatedly sending Msg3 are the same, the base station can first perform signal combination and then demodulate. When the channel changes slowly, the performance is better than demodulating each Msg3 separately; for When the uplink beams of the repeatedly sent Msg3 are different, the base station can use the optimal beam for reception and demodulation respectively, and can obtain beam diversity gain and improve coverage performance when the channel changes rapidly.

Example 4

This embodiment introduces the determination of the beam for retransmitting Msg3 through the instruction of the network device. The retransmission of Msg3 is scheduled through DCI scrambled by the TC-RNTI.

In the first type of method in this embodiment, the uplink beam for retransmitting Msg3 may be determined according to the method in Embodiment 2. That is to say, the explicit indication method in Embodiment 2 can be used to determine the uplink beam for retransmitting Msg3: an explicit indication information, denoted as the second indication information, indicates one or more SSB or PRACH indexes, and according to the implementation The method in Example 2 determines the uplink beam for retransmitting Msg3.

However, it should be noted that since the retransmission of Msg3 is scheduled through TC-RNTI scrambled DCI, not through RAR messages, so for the method of using explicit indication (embodiment 2), the second indication information can be The bearer is sent in the DCI scrambled by the TC-RNTI (not the RAR message, or the DCI that schedules the RAR).

In the second type of method in this embodiment, the uplink beam for retransmitting Msg3 is associated with the uplink beam for initial transmission of Msg3. More precisely, it uses an explicit indication information, which is recorded as the second indication information, which indicates one or more indexes of the reference initial transmission Msg3; the uplink beam of the retransmission Msg3 is based on the reference initial transmission indicated by the second indication information. The uplink beam of Msg3 is determined.

The second indication information may only indicate one retransmission Msg3, for example, may indicate an index of one retransmission Msg3; or, the second indication information may indicate multiple retransmission Msg3, for example, indicate multiple retransmission Msg3 indexes through a bitmap, or Indicates one of several associated styles.

For example, the second indication information may indicate the initial transmission Msg3 corresponding to the plurality of retransmission Msg3 through a bitmap (bitmap). Each K bits in the Bitmap is used to indicate which one of the maximum 2 ^K initial transmission Msg3s corresponds to one retransmission Msg3.

Example 1: When K=2, the four states {00, 01, 10, 11} that can be represented by the bit information in the second indication correspond to Msg3 PUSCH 0, Msg3 PUSCH 1, Msg3 PUSCH 2, first pass Msg3 PUSCH 3.

Example 2: Assuming that a retransmission Msg3 is repeatedly transmitted 3 times, a total of 2*3=6 bits are required to indicate the initial transmission Msg3 PUSCH corresponding to the retransmission Msg3. For example, the second indication information of Bitmap="001110" indicates that the first retransmission of Msg3 corresponds to the initial transmission of Msg3 PUSCH 0 (00), and the second retransmission of Msg3 corresponds to the initial transmission of Msg3 PUSCH 3 (11), The third retransmission of Msg3 corresponds to the initial transmission of Msg3 PUSCH 2 (10).

For another example, the second indication information may indicate one of several association patterns. The associated style refers to the style of the retransmitted Msg3 that is repeatedly transmitted and its associated initial transmitted Msg3. The association style can be predefined, or indicated by the base station through system information broadcast. For example, suppose a retransmission Msg3 is repeated 3 times, and there are 4 initial Msg3 PUSCHs (first Msg3 PUSCH 0, first Msg3 PUSCH 1, first Msg3 PUSCH 2, first Msg3 PUSCH 3), which can be predefined Several associated styles:

pattern1={Msg3 PUSCH 0-Msg3 PUSCH 1-Msg3 PUSCH 2},

pattern2={Msg3 PUSCH 1-Msg3 PUSCH 2-Msg3 PUSCH 3},

pattern3={Msg3 PUSCH 0-Msg3 PUSCH 2-Msg3 PUSCH 0},

....

For example, when the second indication information indicates pattern2, the three retransmitted Msg3s that are repeatedly transmitted are sequentially associated with the initial Msg3 PUSCH 1, the initial Msg3 PUSCH 2, and the initial Msg3 PUSCH 3, and each retransmitted Msg3 can be based on its The associated initial Msg3 PUSCH determines the uplink beam.

The uplink beam of each retransmission Msg3 is the same as (indicated by the second indication information) the uplink beam of the initial transmission Msg3 associated with it.

Through the method in this embodiment, the network device can flexibly instruct the UE to transmit the uplink beam when retransmitting Msg3 according to requirements, so that the most suitable receiving strategy can be selected when receiving retransmission Msg3, such as combining or joint detection, or boosting the beam Diversity gain, thereby improving the coverage performance of Msg3.

It can be understood that the method of this embodiment can also be considered to determine the uplink beam of the PRACH through the combination of "predefined rules" and "instructions from network devices", that is, through "predefined rules and network device instructions". Indicate" to determine the uplink beam for retransmitting Msg3.

Referring to FIG. 10 , an embodiment of the present disclosure provides an apparatus for sending Msg3, which is applied to a terminal. The apparatus 1000 includes:

The first processing module 1001 is configured to determine an uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules and/or instructions of network equipment;

The first sending module 1002 is configured to send the initial transmission Msg3 through the uplink beam of the initial transmission Msg3, or send the retransmission Msg3 through the uplink beam of the retransmission Msg3.

In the embodiments of the present disclosure, the terminal can determine the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules and/or instructions of network equipment (explicit signaling or implicit signaling), and the network equipment can also An appropriate detection scheme is selected according to the determined uplink beam of the Msg3, thereby improving the detection performance of the Msg3, and further improving the coverage performance of the network device.

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

Rule 1-b) If the initial transmission of Msg3 or retransmission of Msg3 is repeated transmission, the uplink beam determination method of initial transmission of Msg3 or retransmission of Msg3 is one of the following:

That is, the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission may be different; according to the SSB selected when the UE initiates random access and the SSB actually sent by the network device, determine the multiple repeated transmissions of the initial transmission Msg3 or Msg3 Retransmit the uplink beam of Msg3.

Optionally, in the above rule 1-b2, one of the following is further included:

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

Rule 2-b) When the PRACH is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or the retransmission Msg3 is non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 It is the same as the uplink beam of the predefined PRACH (such as the first PRACH);

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

Optionally, in the above rule 2-c, one of the following is further included:

In an embodiment of the present disclosure, the determination of the uplink beam for retransmitting Msg3 according to predefined rules and/or network equipment instructions includes:

(1) RAR information;

(2) Scheduling the DCI of the RAR;

(3) System messages, such as SIB1.

In an implementation manner of the present disclosure, the RAR information, DCI or system message for scheduling RAR is used to indicate any of the following:

(1) one or more reference SSB indexes;

(2) One or more indexes referring to PRACH.

In an embodiment of the present disclosure, when the uplink beam for retransmitting Msg3 is determined according to the instruction of the network device, the instruction of the network device includes DCI scrambled by the TC-RNTI.

(1) one or more reference SSB indexes;

(2) One or more reference PRACH indexes;

In the embodiment of the present disclosure, the device can realize each process implemented in the method embodiment shown in FIG. 3 of the present disclosure, and achieve the same beneficial effect. To avoid repetition, details are not repeated here.

Referring to FIG. 11 , an embodiment of the present disclosure provides an apparatus for receiving Msg3, which is applied to a network device. The apparatus 1100 includes:

The second processing module 1101 is configured to determine the uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3 according to predefined rules; and/or, indicate to the terminal the uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3;

The first receiving module 1102 is configured to receive the initial transmission Msg3, or receive the retransmission Msg3.

or,

Determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 according to the cyclic order of the uplink beams of the repeatedly transmitted PRACH, and then determine the repeated transmission of the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 according to the repeated transmission The uplink beam for initial transmission of Msg3 or retransmission of Msg3;

or,

Through one or more items of RAR information, DCI for scheduling RAR, and system information, the uplink beam for initial transmission of Msg3 is indicated to the terminal.

In an embodiment of the present disclosure, the RAR information, DCI for scheduling RAR, or system information is used to indicate any of the following: (1) one or more reference SSB indexes, or, (2) one or more An index that references PRACH.

In an embodiment of the present disclosure, the TC-RNTI scrambled DCI is used to indicate any of the following:

(1) one or more reference SSB indexes;

(2) One or more reference PRACH indexes;

In the embodiment of the present disclosure, the device can realize each process implemented in the method embodiment shown in FIG. 4 of the present disclosure, and achieve the same beneficial effect. To avoid repetition, details are not repeated here.

Optionally, as shown in FIG. 12 , an embodiment of the present disclosure further provides a communication device 1200, including a processor 1201, a memory 1202, and programs or instructions stored in the memory 1202 and operable on the processor 1201, When the program or instruction is executed by the processor 1201, it realizes each process of the method embodiment shown in FIG. 3 or FIG. 4 above, and can achieve the same technical effect. To avoid repetition, details are not repeated here.

An embodiment of the present disclosure also provides a readable storage medium, on which a program or an instruction is stored, and when the program or instruction is executed by a processor, each process of the above-mentioned method embodiment shown in FIG. 3 or FIG. 4 is implemented. , and can achieve the same technical effect, in order to avoid repetition, it will not be repeated here.

Wherein, the processor is the processor in the terminal described in the foregoing embodiments. The readable storage medium includes computer readable storage medium, such as computer read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

An embodiment of the present disclosure further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the above described in Figure 3 or Figure 4. Each process of the method embodiment is shown, and the same technical effect can be achieved, so in order to avoid repetition, details are not repeated here.

It should be understood that the chips mentioned in the embodiments of the present disclosure may also be referred to as system-on-chip, system-on-chip, system-on-a-chip, or system-on-chip.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be noted that the scope of the methods and apparatus in the disclosed embodiments is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solution of the present disclosure can be embodied in the form of computer software products in essence or in other words, the part that contributes to related technologies, and the computer software products are stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to enable a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in various embodiments of the present disclosure.

It should be noted that it should be understood that the division of the above modules is only a division of logical functions, and may be fully or partially integrated into a physical entity or physically separated during actual implementation. And these modules can all be implemented in the form of calling software through processing elements; they can also be implemented in the form of hardware; some modules can also be implemented in the form of calling software through processing elements, and some modules can be implemented in the form of hardware. For example, the determining module may be a separate processing element, or may be integrated into a certain chip of the above-mentioned device. In addition, it may also be stored in the memory of the above-mentioned device in the form of program code, and a certain processing element of the above-mentioned device may Call and execute the functions of the modules identified above. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together, and can also be implemented independently. The processing element mentioned here may be an integrated circuit with signal processing capability. In the implementation process, each step of the above method or each module above can be completed by an integrated logic circuit of hardware in the processor element or an instruction in the form of software.

For example, each module, unit, subunit or submodule may be one or more integrated circuits configured to implement the above method, for example: one or more specific integrated circuits (Application Specific Integrated Circuit, ASIC), or, one or Multiple microprocessors (digital signal processor, DSP), or, one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), etc. For another example, when one of the above modules is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU) or other processors that can call program codes. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

The terms "first", "second" and the like in the specification and claims of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances such that the embodiments of the disclosure described herein are practiced, for example, in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus. In addition, the use of "and/or" in the description and claims means at least one of the connected objects, such as A and/or B and/or C, means that it includes A alone, B alone, C alone, and both A and B Existence, both B and C exist, both A and C exist, and there are 7 situations where A, B, and C all exist. Similarly, the use of "at least one of A and B" in the present specification and claims should be understood as "A alone, B alone, or both A and B exist".

The embodiments of the present disclosure have been described above in conjunction with the accompanying drawings, but the present disclosure is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Under the inspiration of the present disclosure, without departing from the purpose of the present disclosure and the protection scope of the claims, many forms can be made, all of which are within the protection of the present disclosure.

Claims

A method for sending a message Msg3, applied to a terminal, wherein the method includes:

Determine the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules and/or instructions of network equipment;

Sending the initial transmission Msg3 through the uplink beam of the initial transmission Msg3, or sending the retransmission Msg3 through the uplink beam of the retransmission Msg3.
The method according to claim 1, wherein, in the case of determining the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules, the predefined rules include one or more of the following:

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

The uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3 is determined according to the physical random access channel PRACH sent when the terminal initiates random access.
The method according to claim 2, wherein the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access, including:

In the case that the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and all The uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same;

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is based on the SSB selected when the terminal initiates random access, and the network device actually sends One or more of the SSBs are determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partly different.
The method according to claim 3, wherein the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is based on one of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device or more identified, including:

According to one or more items of the SSB selected when the terminal initiates random access, and the cyclic sequence of the SSB actually sent by the network device, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the repeated The SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 is determined, and the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined;

or,

According to the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3 One or more of them, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission, and then determine the repeated transmission of the initial transmission Msg3 according to the SSB corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 Or retransmit the uplink beam of Msg3.
The method according to claim 2, wherein the uplink beam for the initial transmission or retransmission of Msg3 is determined according to the PRACH sent when the terminal initiates random access, including:

When the PRACH sent when the terminal initiates random access is non-repeated transmission, or when the PRACH sent when the terminal initiates random access is repeated transmission and the uplink beams of each PRACH are the same, the initial The uplink beam for transmitting Msg3 or retransmitting Msg3 is the same as the uplink beam of the PRACH;

or,

When the PRACH sent when the terminal initiates random access is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is non-repeated transmission, the initial transmission Msg3 or retransmission The uplink beam for transmitting Msg3 is the same as the predefined PRACH uplink beam;

or,

When the PRACH sent when the terminal initiates random access is a repeated transmission and the uplink beams of the PRACHs for each repeated transmission are at least partially different, and the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the repeated transmission The uplink beams of the initial transmission of Msg3 or retransmission of Msg3 are determined according to the uplink beams of the PRACH for repeated transmission, and the uplink beams of the initial transmission of Msg3 or retransmission of Msg3 of each repeated transmission are the same or at least partly different.
The method according to claim 5, wherein the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the uplink beam of the PRACH for repeated transmission, including:

Determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 according to one or more of the first PRACH uplink beam and the cyclic sequence of the repeated transmission of the PRACH uplink beam, and then according to the repeated transmission of the initial transmission Msg3 Or retransmit the PRACH corresponding to Msg3, and determine the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 for repeated transmission;

or,

According to one or more of the relationship between the uplink beam of the first PRACH, the cyclic sequence of the uplink beam of the repeated transmission PRACH, and the number of PRACHs and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, determine repeated transmission The PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the PRACH corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3.
The method according to claim 1, wherein the predefined rule agreement or the indication of the network device is used to indicate: according to the uplink beam of the initial transmission Msg3, determine the uplink beam of the retransmission Msg3.
The method according to claim 7, wherein said determining the uplink beam for retransmitting Msg3 according to the uplink beam for initially transmitting Msg3 includes:

In the case that the initially transmitted Msg3 is a non-repeated transmission, or the initially transmitted Msg3 is a repeated transmission and the uplink beam of the initially transmitted Msg3 is the same, the retransmitted Msg3's uplink beam is the same as the initially transmitted Msg3 The uplink beams are the same;

or,

When the initially transmitted Msg3 is repeated transmission, and the uplink beams of the initially transmitted Msg3 are at least partly different, determine the uplink beam of the retransmitted Msg3 according to the determination manner of the initially transmitted uplink beam of the Msg3.
The method according to claim 1, wherein, in the case of determining the uplink beam for the initial transmission of Msg3 according to the indication of the network equipment, the indication of the network equipment includes one or more of the following:

Random access response RAR information;

Scheduling the downlink control information DCI of the RAR;

system information;

Wherein, the RAR information, DCI or system message for scheduling RAR is used to indicate any of the following:

One or more references to the SSB's index;

Index of one or more references to PRACH.
The method according to claim 1, wherein, in the case of determining the uplink beam for retransmitting Msg3 according to the indication of the network equipment, the indication of the network equipment includes the scrambled TC-RNTI temporarily used cell radio network temporary identity DCI;

Wherein, the DCI scrambled by the TC-RNTI is used to indicate any of the following:

One or more references to the SSB's index;

one or more references to PRACH;

Indexes of one or more uplink beams referring to the initial transmission Msg3.
A method for receiving Msg3, applied to a network device, wherein the method includes:

Determine the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules; and/or, indicate to the terminal the uplink beam for initial transmission of Msg3 or retransmission of Msg3;

Receive the initial transmission Msg3, or receive the retransmission Msg3.
The method according to claim 11, wherein, in the case of determining the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules, the predefined rules include one or more of the following:

The uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access;

The uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3 is determined according to the PRACH sent when the terminal initiates random access.
The method according to claim 12, wherein the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access, including:

In the case that the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

or,

When the initial transmission of Msg3 or retransmission of Msg3 is repeated transmission, the uplink beam of the initial transmission of Msg3 or retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access, and all repeated transmissions The uplink beams of the initial transmission or retransmission of Msg3 are the same;

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is based on the SSB selected when the terminal initiates random access and the actual One or more of the sent SSBs are determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partly different.
The method according to claim 13, wherein the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, including :

According to one or more items of the SSB selected when the terminal initiates random access, and the cyclic sequence of the SSB actually sent by the network device, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the repeated The SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 is determined, and the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined;

or,

According to the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3 One or more of them, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission, and then determine the repeated transmission of the initial transmission Msg3 according to the SSB corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 Or retransmit the uplink beam of Msg3.
The method according to claim 12, wherein the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the PRACH sent when the terminal initiates random access, including:

When the PRACH is non-repeated transmission, or when the PRACH is repeated transmission and the uplink beams of each PRACH are the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH;

or,

When the PRACH is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission or retransmission of Msg3 is non-repetitive transmission, the initial transmission of Msg3 or retransmission of Msg3 The uplink beam of the predefined PRACH Uplink beams are the same;

or,

When the PRACH is repeated transmission and the uplink beams of each PRACH are at least partly different, and the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 The uplink beam is based on the repetition The uplink beam of the transmitted PRACH is determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of each repeated transmission are the same or at least partly different.
The method according to claim 15, wherein the uplink beam of the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the uplink beam of the repeated transmission of PRACH, including:

Determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 according to the cyclic order of the uplink beams of the repeatedly transmitted PRACH, and then determine the repeated transmission according to the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 The uplink beam for initial transmission of Msg3 or retransmission of Msg3;

or,

According to the cyclic order of the uplink beams of the repeated transmission of PRACH, and one or more of the relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, determine the initial transmission Msg3 or retransmission of the repeated transmission The PRACH corresponding to Msg3, and then according to the PRACH corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3.
The method according to claim 11, wherein said determining the uplink beam for retransmitting Msg3 according to a predefined rule comprises:

The uplink beam for retransmitting Msg3 is determined according to the uplink beam for initially transmitting Msg3.
The method according to claim 17, wherein said determining the uplink beam for retransmitting Msg3 according to the uplink beam for initially transmitting Msg3 includes:

In the case that the initially transmitted Msg3 is a non-repeated transmission, or the initially transmitted Msg3 is a repeated transmission and the uplink beam of the initially transmitted Msg3 is the same, the retransmitted Msg3's uplink beam is the same as the initially transmitted Msg3 The uplink beams are the same;

or,

When the initially transmitted Msg3 is repeated transmission, and the uplink beams of the initially transmitted Msg3 are at least partly different, determine the uplink beam of the retransmitted Msg3 according to the determination manner of the initially transmitted uplink beam of the Msg3.
The method according to claim 11, wherein indicating to the terminal the uplink beam of the initial transmission of Msg3 comprises:

Through one or more items of RAR information, DCI for scheduling RAR, and system information, indicate to the terminal the uplink beam for initially transmitting Msg3;

Wherein, the RAR information, the DCI for scheduling the RAR or the system message are used to indicate any of the following: one or more reference SSB indexes, or one or more reference PRACH indexes.
The method according to claim 11, wherein instructing the terminal to retransmit the uplink beam of Msg3 includes:

Instruct the terminal to retransmit the uplink beam of Msg3 through the TC-RNTI scrambled DCI;

Wherein, the DCI scrambled by the TC-RNTI is used to indicate any of the following:

One or more references to the SSB's index;

one or more references to PRACH;

Indexes of one or more uplink beams referring to the initial transmission Msg3.
A device for sending Msg3, applied to a terminal, wherein the device includes:

The first processing module is configured to determine the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules and/or instructions of network equipment;

The first sending module is configured to send the initial transmission Msg3 through the uplink beam of the initial transmission Msg3, or send the retransmission Msg3 through the uplink beam of the retransmission Msg3.
The device according to claim 21, wherein, in the case of determining the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules, the predefined rules include one or more of the following:

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

The uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3 is determined according to the physical random access channel PRACH sent when the terminal initiates random access.
The apparatus according to claim 22, wherein the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, including:

In the case that the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and all The uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same;

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is based on the SSB selected when the terminal initiates random access, and the network device actually sends One or more of the SSBs are determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partly different.
The apparatus according to claim 23, wherein the uplink beam of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission is based on one of the SSB selected when the terminal initiates random access and the SSB actually sent by the network device or more identified, including:

According to one or more items of the SSB selected when the terminal initiates random access, and the cyclic sequence of the SSB actually sent by the network device, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the repeated The SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 is determined, and the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined;

or,

According to the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3 One or more of them, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission, and then determine the repeated transmission of the initial transmission Msg3 according to the SSB corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 Or retransmit the uplink beam of Msg3.
The apparatus according to claim 22, wherein the uplink beam for the initial transmission or retransmission of Msg3 is determined according to the PRACH sent when the terminal initiates random access, including:

When the PRACH sent when the terminal initiates random access is non-repeated transmission, or when the PRACH sent when the terminal initiates random access is repeated transmission and the uplink beams of each PRACH are the same, the initial The uplink beam for transmitting Msg3 or retransmitting Msg3 is the same as the uplink beam of the PRACH;

or,

When the PRACH sent when the terminal initiates random access is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission Msg3 or retransmission Msg3 is non-repeated transmission, the initial transmission Msg3 or retransmission The uplink beam for transmitting Msg3 is the same as the predefined PRACH uplink beam;

or,

When the PRACH sent when the terminal initiates random access is a repeated transmission and the uplink beams of the PRACHs for each repeated transmission are at least partially different, and the initial transmission Msg3 or the retransmission Msg3 is a repeated transmission, the repeated transmission The uplink beams of the initial transmission of Msg3 or retransmission of Msg3 are determined according to the uplink beams of the PRACH for repeated transmission, and the uplink beams of the initial transmission of Msg3 or retransmission of Msg3 of each repeated transmission are the same or at least partly different.
The device according to claim 25, wherein the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of the Msg3 is determined according to the uplink beam of the repeated transmission of the PRACH, including:

Determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 according to one or more of the first PRACH uplink beam and the cyclic sequence of the repeated transmission of the PRACH uplink beam, and then according to the repeated transmission of the initial transmission Msg3 Or retransmit the PRACH corresponding to Msg3, and determine the uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 for repeated transmission;

or,

According to one or more of the relationship between the uplink beam of the first PRACH, the cyclic sequence of the uplink beam of the repeated transmission PRACH, and the number of PRACHs and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, determine repeated transmission The PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the PRACH corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3.
The apparatus according to claim 21, wherein the predefined rule agreement or the instruction of the network device is used to indicate: determine the uplink beam for retransmitting the Msg3 according to the uplink beam for the initial transmission of the Msg3.
The device according to claim 27, wherein the determining the uplink beam for retransmitting Msg3 according to the uplink beam for initially transmitting Msg3 includes:

In the case that the initially transmitted Msg3 is a non-repeated transmission, or the initially transmitted Msg3 is a repeated transmission and the uplink beam of the initially transmitted Msg3 is the same, the retransmitted Msg3's uplink beam is the same as the initially transmitted Msg3 The uplink beams are the same;

or,

When the initially transmitted Msg3 is repeated transmission, and the uplink beams of the initially transmitted Msg3 are at least partly different, determine the uplink beam of the retransmitted Msg3 according to the determination manner of the initially transmitted uplink beam of the Msg3.
A device for receiving Msg3, applied to network equipment, wherein the device includes:

The second processing module is configured to determine the uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3 according to predefined rules; and/or, indicate to the terminal the uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3;

The first receiving module is configured to receive the initial transmission Msg3, or receive the retransmission Msg3.
The device according to claim 29, wherein, in the case of determining the uplink beam for initial transmission of Msg3 or retransmission of Msg3 according to predefined rules, the predefined rules include one or more of the following:

The uplink beam for the initial transmission of Msg3 or the retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access;

The uplink beam for the initial transmission of the Msg3 or the retransmission of the Msg3 is determined according to the PRACH sent when the terminal initiates random access.
The apparatus according to claim 30, wherein the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, including:

In the case that the initial transmission Msg3 or the retransmission Msg3 is a non-repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

or,

When the initial transmission of Msg3 or retransmission of Msg3 is repeated transmission, the uplink beam of the initial transmission of Msg3 or retransmission of Msg3 is determined according to the SSB selected when the terminal initiates random access, and all repeated transmissions The uplink beams of the initial transmission or retransmission of Msg3 are the same;

or,

In the case that the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is based on the SSB selected when the terminal initiates random access and the actual One or more of the sent SSBs are determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission are the same or at least partly different.
The apparatus according to claim 31, wherein the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access and the SSB actually sent by the network device, including :

According to one or more items of the SSB selected when the terminal initiates random access, and the cyclic sequence of the SSB actually sent by the network device, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3, and then according to the repeated The SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 is determined, and the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is determined;

or,

According to the SSB selected when the terminal initiates random access, the cyclic order of the SSBs actually sent by the network device, and the relationship between the number of SSBs actually sent by the network device and the number of repetitions of the initial transmission Msg3 or retransmission Msg3 One or more of them, determine the SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of the repeated transmission, and then determine the repeated transmission of the initial transmission Msg3 according to the SSB corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 Or retransmit the uplink beam of Msg3.
The device according to claim 30, wherein the uplink beam of the initial Msg3 transmission or the retransmission Msg3 is determined according to the PRACH sent when the terminal initiates random access, including:

When the PRACH is non-repeated transmission, or when the PRACH is repeated transmission and the uplink beams of each PRACH are the same, the uplink beam of the initial transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH;

or,

When the PRACH is repeated transmission and the uplink beams of each PRACH are at least partially different, and the initial transmission or retransmission of Msg3 is non-repetitive transmission, the initial transmission of Msg3 or retransmission of Msg3 The uplink beam of the predefined PRACH Uplink beams are the same;

or,

When the PRACH is repeated transmission and the uplink beams of each PRACH are at least partly different, and the initial transmission Msg3 or the retransmission Msg3 is repeated transmission, the repeated transmission of the initial transmission Msg3 or the retransmission Msg3 The uplink beam is based on the repetition The uplink beam of the transmitted PRACH is determined, and the uplink beams of the initial transmission Msg3 or the retransmission Msg3 of each repeated transmission are the same or at least partly different.
The device according to claim 33, wherein the uplink beam of the repeated transmission of the initial Msg3 or the retransmission of the Msg3 is determined according to the uplink beam of the repeated transmission of the PRACH, including:

Determine the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 according to the cyclic order of the uplink beams of the repeatedly transmitted PRACH, and then determine the repeated transmission according to the PRACH corresponding to the initial transmission Msg3 or the retransmission Msg3 The uplink beam for initial transmission of Msg3 or retransmission of Msg3;

or,

According to the cyclic order of the uplink beams of the repeated transmission of PRACH, and one or more of the relationship between the number of PRACHs and the number of repetitions of the initial transmission Msg3 or retransmission Msg3, determine the initial transmission Msg3 or retransmission of the repeated transmission The PRACH corresponding to Msg3, and then according to the PRACH corresponding to the repeated transmission of the initial transmission Msg3 or the retransmission Msg3, determine the uplink beam of the repeated transmission of the initial transmission Msg3 or the retransmission Msg3.
A communication device, comprising: a processor, a memory, and a program stored in the memory and operable on the processor, wherein, when the program is executed by the processor, the implementation of claims 1 to 20 The step of any described method.
A readable storage medium storing programs or instructions on the readable storage medium, wherein the steps of the method according to any one of claims 1 to 20 are implemented when the program or instructions are executed by a processor.