CN116684043A

CN116684043A - Msg3 transmitting method, msg3 receiving method, device, equipment and readable storage medium

Info

Publication number: CN116684043A
Application number: CN202210149584.3A
Authority: CN
Inventors: 费永强; 高雪娟
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2023-09-01
Also published as: WO2023155594A1

Abstract

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

Description

Msg3 transmitting method, msg3 receiving method, device, equipment and readable storage medium

Technical Field

The application belongs to the technical field of communication, and particularly relates to a message 3 (Msg 3) sending method, an Msg3 receiving device and a readable storage medium.

Background

In the related art, the base station may instruct/schedule the terminal to repeatedly transmit a physical random access channel (Physical Random Access Channel, PRACH). The beams for repeatedly transmitting PRACH may be the same or different. In addition, the base station may instruct/schedule the terminal to repeatedly transmit the Msg3 physical uplink shared channel (Physical Uplink Shared Channel, PUSCH). Msg3 carries RRC setup request message, whose coverage directly affects the probability of success of random access. The number of repetitions of PRACH may be the same as or different from the number of repetitions of Msg3 PUSCH.

For Msg3, it can be distinguished in particular between primary Msg3 and retransmitted Msg3. The primary Msg3 is scheduled by the base station through random access response (Random Access Response, RAR) information in Msg2, and the retransmitted Msg3 is scheduled by the gNB through downlink control information (Downlink Control Information, DCI) scrambled by a Temporary Cell radio network Temporary identifier (TC-RNTI). Wherein the concepts of retransmission (repetition) and retransmission (retransmission) are not the same. The repeated transmission of the Msg3 means that the base station schedules the terminal to transmit the Msg3 once, and the terminal transmits a plurality of Msg3 PUSCHs; retransmission of Msg3 refers to the terminal's transmission of Msg3 being scheduled again after the base station has scheduled Msg3 for the first time (e.g., because Msg3 was transmitted before the base station did not demodulate correctly). Wherein both the primary Msg3 and the retransmitted Msg3 may be retransmitted.

Currently, although the base station may instruct/schedule the terminal to repeatedly transmit the Msg3 PUSCH, the base station does not instruct/schedule the uplink beam of the Msg3. Therefore, the beam of the terminal transmitting the Msg3 is determined by its own implementation, and the base station cannot determine the transmission beam of the Msg3, so that it is also difficult to select an appropriate reception beam to receive the Msg3, resulting in a reduced coverage performance. How to determine the upstream beam of Msg3 is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides an Msg3 sending method, an Msg3 receiving device and a readable storage medium, which can solve the problem of determining an uplink wave beam of Msg3.

In a first aspect, a Msg3 sending method is provided, applied to a terminal, and includes:

determining an uplink beam of the primary Msg3 or the retransmission Msg3 according to a predefined rule and/or an instruction of the network equipment;

and transmitting the primary transmission Msg3 through an uplink beam of the primary transmission Msg3, or transmitting the retransmission Msg3 through an uplink beam of the retransmission Msg3.

Optionally, in case the upstream beam of the primary Msg3 or the retransmission Msg3 is determined according to predefined rules, the predefined rules comprise one or more of the following:

the primary transmission Msg3 or the uplink wave beam of the retransmission Msg3 is determined according to a synchronous signal block SSB selected when the terminal initiates random access;

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

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

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

or alternatively, the process may be performed,

in the case that the primary transmission Msg3 or the retransmission Msg3 is the repeated transmission, the uplink beam of the primary transmission Msg3 or the retransmission Msg3 which is repeatedly transmitted is determined according to the SSB selected when the terminal initiates the random access, and the uplink beams of all the primary transmission Msg3 or the retransmission Msg3 which are repeatedly transmitted are the same;

or alternatively, the process may be performed,

in the case that the primary transmission Msg3 or the retransmission Msg3 is the retransmission, the uplink beam of the primary transmission Msg3 or the retransmission Msg3 that is retransmitted 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, and the uplink beams of the primary transmission Msg3 or the retransmission Msg3 that are retransmitted are the same or at least partially different.

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

determining SSB corresponding to the primary transmission Msg3 or the retransmission Msg3 according to one or more selected SSB when the terminal initiates random access and one or more of the cyclic sequences of SSB actually sent by the network equipment, and determining uplink beams of the primary transmission Msg3 or the retransmission Msg3 of the repeated transmission according to SSB corresponding to the primary transmission Msg3 or the retransmission Msg3 of the repeated transmission;

Or alternatively, the process may be performed,

and determining SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of repeated transmission according to one or more of SSB selected when the terminal initiates random access, the circulation sequence of SSB actually transmitted by the network equipment and the relation between the number of SSB actually transmitted by the network equipment and the repetition number of the initial transmission Msg3 or the retransmission Msg3, and determining uplink beams of the initial transmission Msg3 or the retransmission Msg3 of repeated transmission according to SSB corresponding to the initial transmission Msg3 or the retransmission Msg3 of repeated transmission.

Optionally, the uplink beam of the initial transmission or retransmission 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 uplink beam of the primary Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH;

or alternatively, the process may be performed,

when the PRACH sent by the terminal when random access is initiated is repeated transmission and the uplink wave beams of each PRACH are at least partially different, and the primary transmission Msg3 or the retransmission Msg3 is non-repeated transmission, the uplink wave beam of the primary transmission Msg3 or the retransmission Msg3 is the same as the uplink wave beam of the pre-defined PRACH;

Or alternatively, the process may be performed,

when the PRACH transmitted when the terminal initiates random access is repeated transmission and the uplink beams of the PRACH of each repeated transmission are at least partially different, and the primary transmission Msg3 or the retransmission Msg3 is repeated transmission, the uplink beam of the primary transmission Msg3 or the retransmission Msg3 of each repeated transmission is determined according to the uplink beam of the PRACH of each repeated transmission, and the uplink beams of the primary transmission Msg3 or the retransmission Msg3 of each repeated transmission are the same or at least partially different.

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

determining the PRACH corresponding to the primary transmission Msg3 or the retransmission Msg3 according to one or more of the uplink wave beam of the first PRACH and the cycle sequence of the uplink wave beam of the PRACH which is repeatedly transmitted, and determining the uplink wave beam of the primary transmission Msg3 or the retransmission Msg3 which is repeatedly transmitted according to the PRACH corresponding to the primary transmission Msg3 or the retransmission Msg3 which is repeatedly transmitted;

or alternatively, the process may be performed,

determining PRACH corresponding to primary transmission Msg3 or retransmission Msg3 of repeated transmission according to one or more of the uplink wave beam of the primary PRACH, the cycle sequence of the uplink wave beam of the PRACH of repeated transmission and the relation between the number of PRACH and the repetition number of the primary transmission Msg3 or retransmission Msg3, and determining the uplink wave beam of the primary transmission Msg3 or retransmission Msg3 of repeated transmission according to the PRACH corresponding to the primary transmission Msg3 or retransmission Msg3 of repeated transmission.

Optionally, the predefined rule convention or the indication of the network device is used to indicate: and determining the uplink beam of the retransmission Msg3 according to the uplink beam of the initial transmission Msg 3.

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

when the primary Msg3 is non-repeated transmission or the primary Msg3 is repeated transmission and the uplink beam of the primary Msg3 is the same, the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the primary Msg 3;

or alternatively, the process may be performed,

and when the primary Msg3 is repeatedly transmitted and the uplink beams of the primary Msg3 are at least partially different, determining the uplink beam of the retransmission Msg3 according to the determination mode of the uplink beam of the primary Msg 3.

Optionally, in the case of determining the upstream beam of the primary Msg3 according to an indication of the network device, the indication of the network device comprises one or more of:

random access response, RAR, information;

scheduling downlink control information DCI of RAR;

a system message;

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

one or more indices referencing SSBs;

Index of one or more reference PRACH.

Optionally, in the case of determining an uplink beam of retransmission Msg3 according to an indication of a network device, the indication of the network device includes DCI scrambled by a temporary cell radio network temporary identity TC-RNTI;

wherein, the TC-RNTI scrambled DCI is used to indicate any one of:

one or more indices referencing SSBs;

an index of one or more reference PRACH;

index of one or more upstream beams referring to the primary Msg3.

In a second aspect, there is provided an Msg3 receiving method, applied to a network device, including:

determining an uplink beam of the primary transmission Msg3 or the retransmission Msg3 according to a predefined rule; and/or, indicating the uplink beam of the initial transmission Msg3 or the retransmission Msg3 to the terminal;

receiving the initial transmission Msg3 or receiving the retransmission Msg3;

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

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

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

or alternatively, the process may be performed,

under the condition that the primary transmission Msg3 or the retransmission Msg3 is the repeated transmission, the uplink wave beams of the primary transmission Msg3 or the retransmission Msg3 are determined according to SSB selected when the terminal initiates random access, and the uplink wave beams of the primary transmission or the retransmission Msg3 of all repeated transmission are the same;

or alternatively, the process may be performed,

in the case that the primary transmission Msg3 or the retransmission Msg3 is a retransmission, the uplink beam of the primary transmission Msg3 or the retransmission Msg3 that is retransmitted is determined according to one or more selected SSBs when the terminal initiates random access and SSBs actually sent by the network device, and the uplink beams of the primary transmission Msg3 or the retransmission Msg3 that are retransmitted are the same or at least partially different.

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

or alternatively, the process may be performed,

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

In the case that the PRACH is non-repeated transmission, or in the case that the PRACH is repeated transmission and the uplink beam of each PRACH is the same, the uplink beam of the primary transmission Msg3 or the retransmission Msg3 is the same as the uplink beam of the PRACH;

or alternatively, the process may be performed,

in the case that PRACH is a repeated transmission and the uplink beam of each PRACH is at least partially different, and the primary transmission or retransmission Msg3 is a non-repeated transmission, the uplink beam of the primary transmission Msg3 or retransmission Msg3 is the same as the predefined uplink beam of the PRACH;

or alternatively, the process may be performed,

in the case that PRACH is a retransmission and the uplink beam of each PRACH is at least partially different, and the primary transmission Msg3 or the retransmission Msg3 is a retransmission, the primary transmission Msg3 or the uplink beam of the retransmission Msg3 that is repeatedly transmitted is determined according to the uplink beam of the PRACH that is repeatedly transmitted, and the primary transmission Msg3 or the uplink beam of the retransmission Msg3 that is repeatedly transmitted is the same or at least partially different.

determining the PRACH corresponding to the primary transmission Msg3 or the retransmission Msg3 according to the circulation sequence of the uplink wave beams of the PRACH repeatedly transmitted, and determining the uplink wave beams of the primary transmission Msg3 or the retransmission Msg3 repeatedly transmitted according to the PRACH corresponding to the primary transmission Msg3 or the retransmission Msg3 repeatedly transmitted;

Or alternatively, the process may be performed,

determining PRACH corresponding to primary transmission Msg3 or retransmission Msg3 of repeated transmission according to the cyclic sequence of uplink wave beams of the PRACH of repeated transmission and one or more of the relation between the number of PRACH and the repetition number of primary transmission Msg3 or retransmission Msg3, and determining uplink wave beams of primary transmission Msg3 or retransmission Msg3 of repeated transmission according to PRACH corresponding to primary transmission Msg3 or retransmission Msg3 of repeated transmission.

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

and determining the uplink beam for retransmitting the Msg3 according to the uplink beam for initially transmitting the Msg 3.

or alternatively, the process may be performed,

when the primary Msg3 is a repeated transmission and the uplink beams of the primary Msg3 are at least partially different, determining the uplink beam of the retransmission Msg3 according to the determination mode of the uplink beam of the primary Msg3

Optionally, indicating the upstream beam of the primary Msg3 to the terminal includes:

indicating an uplink beam of the primary transmission Msg3 to the terminal through one or more of RAR information, DCI of scheduling RAR and system information;

wherein, the RAR information, DCI for scheduling RAR, or system message is used to indicate any one of the following: one or more indexes referencing SSBs, or one or more indexes referencing PRACH.

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

indicating an uplink beam for retransmitting the Msg3 to the terminal through the DCI scrambled by the TC-RNTI;

wherein, the TC-RNTI scrambled DCI is used to indicate any one of:

one or more indices referencing SSBs;

an index of one or more reference PRACH;

index of one or more upstream beams referring to the primary Msg3.

In a third aspect, there is provided a transmission apparatus of Msg3, applied to a terminal, including:

a first processing module, configured to determine an uplink beam of the primary Msg3 or the retransmission Msg3 according to a predefined rule and/or an instruction of the network device;

and the first sending module is used for sending the initial transmission Msg3 through an uplink beam of the initial transmission Msg3 or sending the retransmission Msg3 through an uplink beam of the retransmission Msg3.

or alternatively, the process may be performed,

Or alternatively, the process may be performed,

and when the primary Msg3 is repeatedly transmitted and the uplink beams of the primary Msg3 are at least partially different, determining the uplink beam of the retransmission Msg3 according to the determination mode of the uplink beam of the primary Msg3.

In a fourth aspect, there is provided a receiving apparatus of Msg3, applied to a network device, including:

the second processing module is used for determining uplink beams of the primary transmission Msg3 or the retransmission Msg3 according to a predefined rule; and/or, indicating the uplink beam of the initial transmission Msg3 or the retransmission Msg3 to the terminal;

and the first receiving module is used for receiving the initial transmission Msg3 or receiving the retransmission Msg3.

or alternatively, the process may be performed,

Or alternatively, the process may be performed,

or alternatively, the process may be performed,

In a fifth aspect, there is provided a communication device comprising: a processor, a memory and a program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the method according to the first or second aspect.

In a sixth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor implement the steps of the method according to the first or second aspect.

In the embodiment of the application, under the condition that the indication overhead is not required to be increased, the network equipment can determine the uplink wave beam of the primary transmission or retransmission Msg3 sent by the UE, so that the primary transmission or retransmission Msg3 can be received by using a more suitable receiving wave beam, or the network equipment can flexibly indicate the uplink wave beam when the primary transmission or retransmission Msg3 is transmitted by the UE according to the requirement, so that the most suitable receiving strategy can be selected when the Msg3 is received, such as combination or joint detection, or the wave beam diversity gain is improved, and the coverage performance of the Msg3 is further improved.

Drawings

FIG. 1 is a schematic diagram of a 4-step RACH;

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

fig. 3 is a flowchart of an Msg3 sending method provided in an embodiment of the present application;

fig. 4 is a flowchart of an Msg3 receiving method according to an embodiment of the present application;

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

fig. 6 is a schematic diagram of an embodiment of the present application, where N < M is an integer multiple, where multiple Msg3 beams are different;

FIG. 7 is a schematic diagram of the embodiment of the present application, where the repeatedly transmitted multiple Msg3 beams are different, N < M, and not necessarily an integer multiple;

FIG. 8 is a schematic diagram of multiple Msg3 beams with different, N > M and integer multiples, which are repeatedly transmitted according to an embodiment of the present application;

FIG. 9 is a schematic diagram of the embodiment of the present application, where the repeatedly transmitted multiple Msg3 beams are different, N > M, and not necessarily an integer multiple;

fig. 10 is a schematic diagram of an Msg3 sending device according to an embodiment of the present application;

fig. 11 is a flowchart of an Msg3 receiving apparatus according to an embodiment of the present application;

fig. 12 is a schematic diagram of a communication device according to an embodiment of the present application.

Detailed Description

The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.

The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.

The beams may also be described herein as spatial filters (spatial filters) or spatial correlation information (spatial relation information), such as by referring to the upstream beams when the terminal is transmitting as upstream spatial filters, or the downstream beams when the base station is transmitting as downstream spatial correlation information, etc. Accordingly, similar descriptions may be considered equivalent.

In order to facilitate understanding of the technical scheme of the present application, the following technical points are introduced:

in the fifth generation mobile communication technology (5th Generation,5G) New Radio (NR) system, with the increase of the deployment frequency of the wireless system, the propagation loss of the wireless signal is increased, resulting in a shortened signal transmission distance and a reduced coverage performance of the network. Especially for uplink transmissions, i.e. transmissions sent by a User Equipment (UE) and received by a base station (next generation Node B, gNB), the coverage of the uplink channel is more limited than for downlink due to the lower transmit power of the UE.

Message 3 (msg 3) is an important uplink channel in a four-step random access (4-step RACH) procedure, which carries a radio resource control (Radio Resource Control, RRC) setup request Message sent by the UE. A 4-step RACH procedure is shown in fig. 1.

After acquiring the random access channel (Random Access Channel, RACH) configuration information, the successful 4-step RACH procedure performed by the UE can be summarized as follows:

step 1: the UE selects a target synchronization signal block (Synchronization Signal and PBCH block, SSB) (e.g., SSB with measured reference signal received power (Reference Signal Received Power, RSRP) of the target SSB greater than a threshold);

step 2: the UE transmits a message 1 (Msg 1) (physical random access channel (Physical Random Access Channel, PRACH)) in a selected SSB-associated random access Occasion (RO) according to the RACH configuration information;

step 3: the UE receives message 2 (Msg 2) (random access response (Random Access Response, RAR)) sent by the base station;

step 4: the UE sends a message 3 (Msg 3) according to the indication of the RAR;

step 5: the UE receives message 4 (Msg 4) sent by the base station.

Therefore, whether the gNB can correctly receive the Msg3 sent by the UE directly relates to whether the UE can smoothly access the cell, so that the coverage performance of the Msg3 is particularly important. UEs in areas with large fading such as cell edges or basement have large transmission loss of radio signals (e.g., msg 3), and thus need coverage enhancement.

Msg3 of Release 15 (Release 15, rel-15) and Release 16 (Release 16, rel-16) do not support repeated transmissions. To improve the coverage performance of Msg3, NR of version 17 (Release 17, rel-17) supports repeated transmission of Msg 3. Further, message 1 (Msg 1), i.e. repeated transmission of PRACH, is further supported in Release 18 (Release 18, rel-18).

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

Currently, the protocol does not specify how the UE determines the upstream beam of the primary or retransmission Msg3.

For the base station, since the uplink beam of the initial transmission or retransmission Msg3 of the UE retransmission is uncertain, the performance of the base station in receiving Msg3 can be improved to be lower:

(1) Because the uplink wave beams of the primary transmission or the retransmission of the repeated transmission are possibly different, the base station cannot firstly combine signals among the Msg3 and then demodulate the signals, only can respectively demodulate the Msg3 PUSCH, and the performance improvement is small;

(2) Since the base station does not determine the uplink beam of each Msg3, the reception beam for each Msg3 cannot be adjusted accordingly, and the optimal reception effect cannot be obtained even for a single Msg3.

The embodiment of the application can be applied to a 5G NR system, comprising network equipment and a terminal, and can be understood that the embodiment of the application can also be applied to other systems, such as a 6G system and the like, as long as the terminal needs to repeatedly send a data channel in the initial access process.

Referring to fig. 2, an illustration of a suitable scenario for an embodiment of the present application is provided. A plurality of UE including UE1 and UE2 initiate random access to a base station and apply for wireless network connection service; the base station receives the random access request from the at least one UE and wirelessly services it. And data interaction and transmission are carried out between the base station and the UE1 and the UE2 through wireless communication.

Referring to fig. 3, an embodiment of the present application provides a method for sending Msg3, where an execution body of the method may be a terminal, and specific steps include: step 301 and step 302.

Step 301: determining an uplink beam of the primary Msg3 or the retransmission Msg3 according to a predefined rule and/or an instruction of the network equipment;

msg3 herein may also be replaced with Msg3 PUSCH, i.e. primary transmission Msg3 may be replaced with primary transmission Msg3 PUSCH and retransmission Msg3 may be replaced with retransmission Msg3 PUSCH.

Step 302: and transmitting the primary transmission Msg3 through an uplink beam of the primary transmission Msg3, or transmitting the retransmission Msg3 through an uplink beam of the retransmission Msg3.

In the embodiment of the application, the terminal can determine the uplink beam of the primary transmission Msg3 or the retransmission Msg3 according to the predefined rule and/or the indication of the network equipment (for example, the indication of the network equipment can be explicit signaling or implicit signaling), so that the terminal can determine the uplink beam of the primary transmission Msg3 or the retransmission Msg3, and the network equipment (for example, the base station) can select an appropriate detection scheme 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 equipment.

In one embodiment of the application, in case the upstream beam of the primary Msg3 or the retransmission Msg3 is determined according to predefined rules, the predefined rules comprise one or more of the following:

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

rule 2: and the uplink wave beam of the initial transmission Msg3 or the retransmission Msg3 is determined according to the PRACH sent when the terminal initiates random access.

Optionally, the rule 1 includes at least one of:

rule 1-a) in the case that the primary transmission Msg3 or the retransmission Msg3 is non-repeated transmission, the uplink beam of the primary transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access;

rule 1-b) if the primary transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam determining method of the primary transmission Msg3 or the retransmission Msg3 comprises at least one of the following steps:

rule 1-b 1) in the case that the primary transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam of the primary transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, and the uplink beams of all the primary transmission Msg3 or the retransmission Msg3 which are repeatedly transmitted are the same;

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

Rule 1-b 2) in the case that the primary transmission Msg3 or the retransmission Msg3 is a retransmission, the uplink beam of the primary transmission Msg3 or the retransmission Msg3 that is retransmitted 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, and the uplink beams of the primary transmission Msg3 or the retransmission Msg3 that are retransmitted are the same or at least partially different.

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

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

rule 1-b 2-1) determines SSB corresponding to the primary transmission Msg3 or retransmission Msg3 according to one or more of SSB selected when the terminal initiates random access and the cyclic sequence of SSB actually transmitted by the network device, and determines uplink beam of the primary transmission Msg3 or retransmission Msg3 of repeated transmission according to SSB corresponding to the primary transmission Msg3 or retransmission Msg3 of repeated transmission;

Rule 1-b 2-2) determines SSBs corresponding to primary transmission Msg3 or retransmission Msg3 of repeated transmission according to one or more of SSBs selected when the terminal initiates random access, a cycle sequence of SSBs actually transmitted by the network device, and a relationship between the number of SSBs actually transmitted by the network device and the repetition number of primary transmission Msg3 or retransmission Msg3, and determines uplink beams of the primary transmission Msg3 or retransmission Msg3 of repeated transmission according to SSBs corresponding to the primary transmission Msg3 or retransmission Msg3 of repeated transmission.

Optionally, the rule 2 includes at least one of:

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

that is, if the PRACH is non-repetitive transmission or the PRACH is repetitive transmission and each PRACH uplink beam is the same, the uplink beam of the primary Msg3 or the retransmission Msg3 (of the repetitive transmission or the non-repetitive transmission) is the same as the uplink beam of the PRACH.

Rule 2-b) in case PRACH is a repeated transmission and the uplink beam of each PRACH is at least partially different, and the primary or retransmission Msg3 is a non-repeated transmission, the uplink beam of the primary or retransmission Msg3 is the same as the uplink beam of a predefined PRACH (e.g. the first PRACH);

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

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

Rule 2-c) in case PRACH is a retransmission and the uplink beams of the PRACH of each retransmission are at least partially different, and the primary or retransmission Msg3 is a retransmission, the uplink beam of the primary or retransmission Msg3 of the retransmission is determined according to the uplink beam of the PRACH of each retransmission, and the uplink beams of the primary or retransmission Msg3 of each retransmission are the same or at least partially different.

That is, PRACH is a retransmission and each PRACH uplink beam is different, and the primary Msg3 or the retransmission Msg3 uplink beam of the retransmission may be different, which is determined by the uplink beam of the retransmission PRACH.

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

Rule 2-c-1) determining the PRACH corresponding to the primary transmission Msg3 or the retransmission Msg3 according to the cycle sequence of the uplink wave beams of the PRACH repeatedly transmitted, and determining the uplink wave beams of the primary transmission Msg3 or the retransmission Msg3 repeatedly transmitted according to the PRACH corresponding to the primary transmission Msg3 or the retransmission Msg3 repeatedly transmitted;

rule 2-c-2) determining PRACH corresponding to primary transmission Msg3 or retransmission Msg3 of repeated transmission according to a cyclic sequence of uplink beams of PRACH of repeated transmission and one or more of relation between the number of PRACH and the repetition number of primary transmission Msg3 or retransmission Msg3, and determining uplink beams of primary transmission Msg3 or retransmission Msg3 of repeated transmission according to PRACH corresponding to primary transmission Msg3 or retransmission Msg3 of repeated transmission.

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

That is, according to a predefined rule, it may be agreed that the uplink beam of the retransmission Msg3 is determined according to the uplink beam of the initial transmission Msg3, or the network device may instruct the uplink beam of the retransmission Msg3 to be determined according to the uplink beam of the initial transmission Msg 3.

In one embodiment of the present application, the determining the uplink beam for retransmitting the Msg3 according to the uplink beam for primarily transmitting the Msg3 includes one of the following:

mode 1) in the case where the primary Msg3 is non-retransmission or where the primary Msg3 is retransmission and the uplink beam of the primary Msg3 is the same, the uplink beam of the retransmitted Msg3 is the same as the uplink beam of the primary Msg 3;

mode 2) determining the uplink beam of the retransmission Msg3 according to the determination mode of the uplink beam of the primary transmission Msg3 when the primary transmission Msg3 is a repeated transmission and the uplink beams of the primary transmission Msg3 are at least partially different.

That is, the method of determining the upstream beam of the retransmission Msg3 may be the same as the method of determining the upstream beam of the initial transmission Msg 3.

In one embodiment of the application, in case the upstream beam of the primary Msg3 is determined from an indication of the network device, the indication of the network device comprises one or more of the following:

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

(2) Downlink control information (Downlink Control Information, DCI) of the scheduling RAR;

(3) System messages (System Information, SI), such as system message block 1 (System Information Block 1, sib1).

In one embodiment of the present application, the RAR information, DCI for scheduling RAR, or a system message (e.g., system information block 1) is used to indicate any one of the following:

(1) One or more indices referencing SSBs;

(2) Index of one or more reference PRACH.

In one embodiment of the present application, in the case where the uplink beam of the retransmission Msg3 is determined according to an indication of the network device, the indication of the network device includes DCI scrambled by a Temporary Cell radio network Temporary identifier (TC-RNTI).

In one embodiment of the present application, the TC-RNTI scrambled DCI is used to indicate any one of:

(1) One or more indices referencing SSBs;

(2) An index of one or more reference PRACH;

(3) Index of one or more upstream beams referring to the primary Msg 3.

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

Step 401: determining an uplink beam of the primary transmission Msg3 or the retransmission Msg3 according to a predefined rule; and/or, indicating the uplink beam of the initial transmission Msg3 or the retransmission Msg3 to the terminal;

step 402: receiving the primary transmission Msg3 or receiving the retransmission Msg3.

It will be appreciated that the network device may receive the primary transmission Msg3 or the retransmission Msg3 via a receive beam corresponding to the primary transmission Msg3 or the uplink beam of the retransmission Msg3. In one embodiment of the application, in case the upstream beam of the primary Msg3 or the retransmission Msg3 is determined according to predefined rules, the predefined rules comprise one or more of the following:

In one embodiment of the present application, the uplink beam of the primary transmission Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates the random access, including:

or alternatively, the process may be performed,

In one embodiment of the present application, the uplink beam of the primary Msg3 or the retransmission Msg3 that is repeatedly transmitted is determined according to the SSB selected when the terminal initiates random access, and the SSB actually sent by the network device, including:

determining SSB corresponding to the primary transmission Msg3 or the retransmission Msg3 according to SSB selected when the terminal initiates random access and the circulation sequence of SSB actually sent by network equipment, and determining uplink beams of the primary transmission Msg3 or the retransmission Msg3 which are repeatedly transmitted according to SSB corresponding to the primary transmission Msg3 or the retransmission Msg3 which are repeatedly transmitted;

Or alternatively, the process may be performed,

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

or alternatively, the process may be performed,

Or alternatively, the process may be performed,

In one embodiment of the present application, the uplink beam of the primary Msg3 or the retransmission Msg3 that is repeatedly transmitted is determined according to the uplink beam of the PRACH that is repeatedly transmitted, including:

or alternatively, the process may be performed,

In one embodiment of the present application, the determining the uplink beam for retransmitting Msg3 according to a predefined rule includes:

In one embodiment of the present application, the determining the uplink beam for retransmitting the Msg3 according to the uplink beam for primarily transmitting the Msg3 includes:

or alternatively, the process may be performed,

In one embodiment of the present application, indicating to a terminal an upstream beam of an initial Msg3 comprises:

the upstream beam of the primary Msg3 is indicated to the terminal by one or more of RAR information, DCI and SI of the scheduled RAR.

In one embodiment of the present application, the RAR information, DCI or SI for scheduling RAR is used to indicate any one of the following: (1) An index of one or more reference SSBs, or (2) an index of one or more reference PRACH.

In one embodiment of the present application, indicating to a terminal an uplink beam to retransmit Msg3 includes:

the uplink beam of the retransmission Msg3 is indicated to the terminal by the TC-RNTI scrambled DCI.

(1) One or more indices referencing SSBs;

(2) An index of one or more reference PRACH;

(3) Index of one or more upstream beams referring to the primary Msg 3.

Embodiments of the present application are described below by way of example 1, example 2, example 3 and example 4.

Example 1

This embodiment describes determining the upstream beam of the primary Msg3 by predefined rules.

The first type of method of this embodiment is primarily related to SSB. The upstream beam of the initial Msg3 may be determined according to SSB selected when the UE initiates random access, and predefined rules.

Case 1-1: the primary transmission Msg3 is a non-repeated transmission.

In this case, the upstream beam of the initial Msg3 may be determined according to the SSB selected when the UE initiates the random access.

For example, the best beam to receive SSB may be considered the upstream beam to transmit the primary Msg3 based on the reciprocity of the wireless communication channel.

Referring to fig. 5, in which the base station transmits 4 SSBs (SSB 0, SSB1, SSB2, SSB 3) in total, the UE has 3 receive beams (Rx beam 0,Rx beam 1,Rx beam 2); the UE selects SSB1 as the target SSB to initiate random access. Among the 3 reception beams, the UE has the highest signal strength and the best performance when receiving SSB using Rx beam 1, and therefore, the UE uses the uplink beam or the transmission beam corresponding to Rx beam 1 as the uplink beam/transmission beam of the primary transmission Msg 3.

Cases 1-2: the initial Msg3 is a repeated transmission.

In this case, the upstream beam determination method of the preliminary transmission Msg3 includes:

the method comprises the following steps: all uplink beams of the primary transmission Msg3 of the repeated transmission are the same and are determined according to the SSB selected when the UE initiates the random access (the method one in the case 1-2 is the same as the case 1-1, namely, the uplink beam of the primary transmission Msg3 is determined according to the SSB selected when the UE initiates the random access);

The second method is as follows: determining an uplink beam of the primary transmission Msg3 of repeated transmission according to one or more selected SSB (single-layer broadcast) when the UE initiates random access and SSB actually transmitted by the base station;

specifically, for the first primary transmission Msg3, the method in the case 1-1 in method one may be referred to, and the uplink beam of the first primary transmission Msg3 is determined according to the SSB selected when the UE initiates random access; besides the first primary transmission Msg3, other primary transmission Msg3 can be sequentially associated and determined according to the SSB selected during random access and the sequence of the cyclic index of the SSB actually transmitted by the base station.

Wherein the sequence of the cyclic index of the SSB actually transmitted by the base station may represent the cyclic order of the SSBs actually transmitted by the network device.

For example, taking fig. 5 as an example, the base station actually transmits the SSB with a cyclic index sequence of 0-1-2-3-0-1-2-3 … …; if the first primary Msg3 (Msg 3 0 in the figure) determines the upstream beam from SSB1, then SSBs corresponding to subsequent primary msgs 3 need to be sequentially associated from SSB1, i.e., the second primary Msg3 (Msg 3 1 in the figure) determines the upstream beam from SSB2, the third primary Msg3 (Msg 3 2 in the figure) determines the upstream beam from SSB3, the fourth primary Msg3 (Msg 3 3 in the figure) determines the upstream beam from SSB0, the fifth primary Msg3 (Msg 3 4 in the figure) determines the upstream beam from SSB1, … …, and so on.

For another example, the uplink beam of the primary transmission Msg3 of the repeated transmission can be determined according to the SSB actually sent by the base station, if the sequence of the cyclic index of the SSB actually sent by the base station is 0-1-2-3-0-1-2-3 … …, the 1 st and 2 … … K primary transmission Msg3 determines the uplink beam according to the 1 st and 2 … … K indexes of the cyclic index sequence 0-1-2-3-0-1-2-3 … …; i.e. the first primary Msg3 determines the uplink beam from SSB0, the second primary Msg3 determines the uplink beam from SSB1, … …, and so on.

And a third method: and determining uplink beams of the primary transmission Msg3 of the repeated transmission according to one or more of SSB selected when the UE initiates random access, SSB actually transmitted by the base station and relation between the number of SSB actually transmitted by the base station and the repetition number of the primary transmission Msg 3.

Specifically, according to the relation between the number N of SSBs actually sent by the base station and the repetition number M of the primary transmission Msg3, the SSB corresponding to the primary transmission Msg3 of the repeated transmission is determined, and then the uplink beam of the primary transmission Msg3 of the repeated transmission is determined according to the corresponding SSB.

(1) If M=N, the primary transmission Msg3 of repeated transmission corresponds to SSB one by one; the first primary transmission Msg3 determines an uplink wave beam according to the SSB selected during random access, other Msg3 determines the SSB according to the sequence of the cyclic index of the SSB actually transmitted by the base station, and then determines the uplink wave beam of the primary transmission Msg3 according to the SSB;

(2) If N is less than or equal to M, namely the number of SSB is less than or equal to the repetition number of the primary Msg3, each SSB corresponds to a plurality of Msg3 in the case; the SSB corresponding to the first Msg3 is the SSB selected by the UE according to random access, and the corresponding relation between other Msg3 and SSB is determined by sequentially associating the sequences of cyclic indexes of SSBs actually transmitted by the base station and the SSB indexes selected by the UE according to random access as initial indexes, wherein:

a) If an integer multiple relationship between M and N is specified, each SSB corresponds to M/N Msg3, and the Msg3 sets corresponding to different SSBs are different, as shown in fig. 6.

For example, SSB0 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 the relation between M and N is allowed to be unnecessary to be integral multiple, the method can be used forSSB corresponds to->Msg3, post->SSB corresponds to->The msbs of the Msg3 set are different from each SSB set, as shown in fig. 7.

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

(3) If N is greater than or equal to M, namely the number of SSB is greater than or equal to the repetition number of primary Msg3, each Msg3 corresponds to a plurality of SSB in the case; the SSB corresponding to the first Msg3 is an SSB selected by the UE according to random access, and the corresponding relation between other Msg3 and SSB is determined by sequentially associating the sequence of cyclic indexes of SSB actually sent by the network device with the SSB index selected by the UE during random access as a starting index, wherein:

a) If the relation between N and M is defined to be an integer multiple, N/M SSBs are associated with each Msg3, and SSB sets associated with different msgs 3 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 the relation between N and M is allowed to be unnecessary to be integral multiple, the method can be used forThe individual Msg3 corresponds to->SSB, post->The individual Msg3 corresponds to->The SSBs corresponding to different msgs 3 are different in set, as shown in fig. 9.

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

From the perspective of transmitting the upstream beam of Msg3, the upstream beam of Msg3 corresponding to a different SSB may also be different, since the optimal receive beam for each SSB may be different. If one Msg3 corresponds to multiple SSBs above, the UE may select one SSB of the corresponding multiple SSBs to determine the uplink beam when transmitting the Msg 3.

The second class of methods of this embodiment is primarily related to PRACH. The uplink beam of the primary Msg3 is determined according to the uplink beam of the PRACH transmitted by the UE and a predefined rule.

Case 2-1: the PRACH is non-repeated or the PRACH is repeated and the uplink beam of each PRACH is the same.

In this case, if the primary transmission Msg3 is a non-repeated transmission, its uplink beam is the same as that of the PRACH; if the primary transmission Msg3 is repeated, all uplink beams of the primary transmission Msg3 of the repeated transmission are identical to those of the PRACH. That is, the uplink beam of Msg3 is the same as that of PRACH, whether or not it is a repeated transmission.

Case 2-2: PRACH is a retransmission and there is a difference in uplink beam of PRACH for each retransmission, while primary transmission Msg3 is a non-retransmission.

The uplink beam for PRACH retransmission may be different, and may be regarded as SSB different for each PRACH. In this case, the upstream beam of the primary Msg3 is the same as the upstream beam of some predefined PRACH.

For example, the predefined PRACH may be the first PRACH of a plurality of PRACHs of the repeated transmission. The predefined PRACH may also be a PRACH that may be uniquely determined in other ways.

Cases 2-3: PRACH is a retransmission and there is a difference in uplink beam of PRACH for each retransmission, and primary transmission Msg3 is also a retransmission.

It will be appreciated that cases 2-3 may refer to methods two and three of cases 1-2, where methods two and three of cases 1-2: the "SSB selected when the UE initiates random access" is replaced by the "first PRACH", and the "SSB actually transmitted by the base station" is replaced by the "repeatedly transmitted PRACH".

The specific description is as follows:

the method comprises the following steps: and determining the uplink wave beam of the initial transmission Msg3 of the repeated transmission according to one or more of the uplink wave beam of the first PRACH and the cyclic sequence of the uplink wave beam of the repeated transmission PRACH.

Specifically, for the first primary Msg3, the method in case 1-1 may be referred to, and the uplink beam of the first primary Msg3 may be determined according to the uplink beam of the first PRACH; the uplink beam of other primary transmission Msg3 can be determined according to the uplink beam of the primary PRACH, the cyclic sequence of the uplink beam of the PRACH which is repeatedly transmitted, and the relation between the number of PRACH and the repetition number of the primary transmission Msg3, except for the primary transmission Msg 3.

The second method is as follows: and determining the uplink wave beams of the primary transmission Msg3 of the repeated transmission according to one or more of the uplink wave beam of the first PRACH, the circulation sequence of the uplink wave beams of the repeated transmission PRACH and the relation between the number of the PRACH and the repetition number of the primary transmission Msg 3.

Specifically, according to the relation between the number N of the PRACH transmitted repeatedly and the repetition number M of the primary transmission Msg3, the PRACH corresponding to the primary transmission Msg3 transmitted repeatedly is determined, and then the uplink beam of the primary transmission Msg3 is determined according to the corresponding PRACH.

(1) If M=N, the primary transmission Msg3 of repeated transmission corresponds to the PRACH one by one; the first primary transmission Msg3 determines a beam according to the first PRACH, other Msg3 determines the PRACH according to the cycle sequence of the uplink beam of the PRACH which is repeatedly transmitted, and determines the uplink beam of the primary transmission Msg3 according to the PRACH;

(2) If N is less than or equal to M, namely the number of PRACH is less than or equal to the repetition number of primary transmission Msg3, in this case, each PRACH corresponds to a plurality of Msg3; the PRACH corresponding to the first Msg3 is the first PRACH, and the correspondence between other Msg3 and the PRACH is determined by sequentially associating the first PRACH with the index of the uplink beam of the PRACH selected when the UE is randomly accessed according to the cyclic sequence of the uplink beam of the PRACH (i.e., the cyclic index sequence of the uplink beam of the PRACH), wherein:

a) If the relation between M and N is required to be an integer multiple, M/N Msg3 are corresponding to each PRACH, and the Msg3 corresponding to different PRACH are different.

b) If the relation between M and N is allowed to be unnecessary to be integral multiple, the method can be used forIndividual PRACH correspondence->Msg3, post->Individual PRACH correspondence->The Msg3 sets corresponding to different PRACH are different.

(3) If N is more than or equal to M, namely the PRACH number is more than or equal to the repetition number of the primary transmission Msg3, each Msg3 corresponds to a plurality of PRACH in the case; the PRACH corresponding to the first Msg3 is the first PRACH, and the corresponding relation between other Msg3 and the PRACH is determined by sequentially associating the indexes of the uplink beams of the PRACH selected during the random access of the UE as initial indexes according to the cycle sequence of the uplink beams of the PRACH, wherein:

a) If the relation between N and M must be an integer multiple, N/M PRACH are allocated to each Msg3, and PRACH sets corresponding to different msgs 3 are different.

b) If the relation between N and M is allowed to be unnecessary to be integral multiple, the method can be used forThe individual Msg3 corresponds to->PRACH, post->The individual Msg3 corresponds to->The PRACH sets corresponding to different Msg3 are different.

Since the optimal reception beam for each PRACH may be different from the perspective of transmitting the uplink beam of Msg3, the uplink beam of Msg3 corresponding to a different PRACH may also be different. If one Msg3 corresponds to multiple PRACH above, the UE may select one of the corresponding multiple PRACH to determine the uplink beam when transmitting the Msg 3.

In this embodiment, the network device may determine the uplink beam of the primary Msg3 sent by the UE without increasing the indication overhead, so that the primary Msg3 may be received by using a more suitable receiving beam. For the case of repeatedly transmitting the primary transmission Msg3, if the uplink wave beams of each repeatedly transmitted Msg3 are the same, the network device can firstly combine signals and then demodulate, and when the channel is slowly changed, the performance is better than that of demodulating each Msg3 respectively; for the situation that the uplink wave beams of the Msg3 which are repeatedly transmitted are different, the network equipment can respectively receive and demodulate by using the optimal wave beams, and can obtain wave beam diversity gain when the channel changes fast, thereby improving the coverage performance.

Example 2

This embodiment describes determining the beam of the initial Msg3 by an indication of the network device.

In this embodiment, the indication by the network device may be an indication (e.g., the first indication) indicating the upstream beam of the primary Msg 3. The first indication information may be carried in a RAR message, or sent in DCI scheduling the RAR, or carried in a system message (e.g., SIB 1) for broadcast.

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

The first indication information may indicate only one SSB, for example, may indicate an index of one SSB; when the first indication information is searched to indicate one SSB, the uplink beams of the primary transmission Msg3 are all determined according to the indicated SSB; if Msg3 is a repeat transmission, then the upstream beams of all repeat transmissions' primary Msg3 are the same and are determined from the indicated SSB.

Alternatively, the first indication information may also indicate a plurality of SSBs. This approach is applicable to the case where the primary Msg3 is a repeat transmission, where the upstream beam of each repeat transmission Msg3 may be different.

For example, the first indication information may indicate SSBs corresponding to the plurality of primary Msg3 through a bitmap (bitmap). Every K bits in the Bitmap are used to indicate a maximum of 2 corresponding to one primary Msg3 ^K Which of the SSBs.

In example 1, when k=2, the 4 states {00,01,10,11} that can be represented by the bit information in the first indication information correspond to SSB0, SSB1, SSB2, SSB3, respectively.

Example 2, assuming that one primary Msg3 is repeatedly transmitted 3 times, a total of 2×3=6 bits are required for indicating the SSB corresponding to the primary Msg 3. For example, a first indication of bitmap= "001110" indicates that the first primary transmission Msg3 corresponds to SSB0 (00), the second primary transmission Msg3 corresponds to SSB3 (11), and the third primary transmission Msg3 corresponds to SSB2 (10).

As another example, the first indication information may indicate one of a plurality of association patterns (association pattern). The association pattern refers to the pattern of the primary transmission Msg3 of the repeated transmission and the SSB associated therewith. The association pattern may be predefined or may be indicated by the base station through a system information broadcast. For example, assuming that one initial Msg3 is repeatedly transmitted 3 times, and a total of 4 SSBs (SSB 0, SSB1, SSB2, SSB 3) several association patterns may be predefined:

pattern1＝{SSB0-SSB1-SSB2}，

pattern2＝{SSB1-SSB2-SSB3}，

pattern3＝{SSB0-SSB2-SSB0}，

……。

for example, when the first indication information indicates pattern2, 3 primary transmissions Msg3 of repeated transmission are sequentially associated with SSB1, SSB2, SSB3, and each primary transmission Msg3 may determine an uplink beam according to the SSB associated therewith.

(2) The second class of methods of this embodiment is primarily related to PRACH.

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

Alternatively, the first indication information may also indicate a plurality of PRACH. This method is applicable to the case where the primary transmission Msg3 is a repeated transmission, and the uplink beam of the primary transmission Msg3 of each repeated transmission may be different.

For example, the first indication information may indicate PRACH corresponding to the plurality of primary Msg3 through a bit map (bitmap). Every K bits in the Bitmap are used to indicate a maximum of 2 corresponding to one primary Msg3 ^K Which of the PRACH.

In example 1, when k=2, 4 states {00,01,10,11} that can be represented by bit information in the first indication information correspond to PRACH0, PRACH1, PRACH2, and PRACH3, respectively.

Example 2, assuming that one primary Msg3 is repeatedly transmitted 3 times, a total of 2*3 =6 bits are required for indicating the PRACH to which the primary Msg3 corresponds. For example, a first indication of bitmap= "001110" indicates that the first primary transmission Msg3 corresponds to PRACH0 (00), the second primary transmission Msg3 corresponds to PRACH3 (11), and the third primary transmission Msg3 corresponds to PRACH2 (10).

As another example, the first indication information may indicate one of several association patterns (association pattern). The association pattern refers to a pattern of the primary transmission Msg3 of the repeated transmission and the PRACH associated therewith. The association pattern may be predefined or indicated by the base station through system information broadcast. For example, assuming that one Msg3 is repeatedly transmitted 3 times, and a total of 4 PRACH (PRACH 0, PRACH1, PRACH2, PRACH 3) several association patterns may be predefined:

pattern1＝{PRACH0-PRACH1-PRACH2}，

pattern2＝{PRACH1-PRACH2-PRACH3}，

pattern3＝{PRACH0-PRACH2-PRACH0}，

……。

for example, when the first indication information indicates pattern2, 3 primary transmission Msg3 of repeated transmission are sequentially associated with PRACH1, PRACH2 and PRACH3, and each primary transmission Msg3 may determine an uplink beam according to the PRACH associated therewith.

In this case, the beam of each primary Msg3 is the same as the beam of its associated PRACH.

Through the method in this embodiment, the base station may flexibly instruct the UE to transmit the uplink beam of the primary transmission Msg3 according to the requirement, so that the most appropriate receiving policy may be selected, for example, to perform combining or joint detection, or to improve the beam diversity gain, thereby improving the coverage performance of the Msg3 when receiving the primary transmission Msg 3.

It should be noted that, the method of this embodiment may also be considered to determine the uplink beam of the PRACH by combining the "predefined rule" with the "indication of the network device", that is, determining the beam of the primary transmission Msg3 by combining the "predefined rule" with the "indication of the network device".

Example 3

This embodiment describes determining the beam of retransmission Msg3 by predefined rules. Retransmission Msg3 is scheduled by DCI scrambled with TC-RNTI.

In the first class of methods of this embodiment, the uplink beam sum of the retransmission Msg3 can be determined according to the method of embodiment 1. I.e. the predefined rules in embodiment 1 can also be used to determine the uplink beam for retransmitting Msg3.

It should be noted, however, that only the method(s) described in example 1 are shown here as being used for both the initial transmission of Msg3 and the retransmission of Msg3. In the first type of method in embodiment 3, the uplink beam for retransmitting Msg3 and the uplink beam for initially transmitting Msg3 may be different and independent from each other.

For example, the primary Msg3 is a repeated transmission, and a plurality of uplink beams of the primary Msg3 are determined according to the case 1-2 method two of embodiment 1, each uplink beam may be different; retransmission Msg3 is also a duplicate transmission, but as soon as the uplink beams of multiple retransmission Msg3 are determined according to the method in case 1-2 of embodiment 1, each uplink beam is identical.

In the second class of methods of this embodiment, the uplink beam of the retransmission Msg3 is associated with the uplink beam of the initial transmission Msg3. More specifically, the uplink beam of the retransmission Msg3 is the same as the uplink beam of the primary transmission Msg3, or the determination method of the uplink beam of the retransmission Msg3 may be the same as the determination method of the uplink beam of the primary transmission Msg3.

Specifically, the following cases are included:

case 2-1: retransmission Msg3 does not repeat transmission, or retransmission Msg3 is a repeat transmission and uses the same uplink beam.

In this case, the uplink beam of the retransmission Msg3 (each retransmission) is the same as the uplink beam of the primary transmission Msg3, whether or not the retransmission Msg3 is a retransmission. The uplink beam used by the UE when transmitting the retransmission Msg3 is the same as the uplink beam used when initially transmitting Msg 3.

The design is simple to implement and is particularly suitable for a scene that the UE moves slowly. At this time, the UE generally uses the optimal uplink beam when initially transmitting the Msg3, and when the base station schedules the UE to retransmit the Msg3, the UE is likely to be unchanged because the UE moves slowly and its position is basically unchanged, and at this time, the uplink beam of initially transmitting the Msg3 is used as the uplink beam for retransmitting the Msg3, so that better performance can still be obtained.

Case 2-2: retransmission Msg3 repeats and uses a different uplink beam.

In this case, the Msg3 of the multiple repeated transmissions of the retransmission Msg3 may correspond to different SSBs (e.g., by the method in embodiment 1), or to different PRACH, and thus the uplink beam may also be different. In case 2-2, the "determination method" of the upstream beam of the retransmission Msg3 is the same as the "determination method" of the upstream beam of the initial transmission Msg 3.

For example, the initial Msg3 is a repeated transmission, and uplink beams of a plurality of Msg3 are determined according to case 1-2 method two of embodiment 1, each uplink beam may be different; if the retransmission Msg3 is also a retransmission, uplink beams of a plurality of retransmission Msg3 are determined according to the second method of case 1-2 of embodiment 1, and each uplink beam may be different. Note that in this case, only the "determination method" is the same, and it does not mean that the "repetition number" is the same. The repetition times may be the same or different.

The design is simple to implement and is particularly suitable for a scene with faster UE speed. At this time, higher beam diversity gain can be obtained by using different uplink beams, and the uplink beam determining methods of the primary transmission Msg3 and the retransmission Msg3 are the same, so that on one hand, the beam diversity gain can be utilized, on the other hand, the implementation of network equipment can be simplified, and the network equipment can receive the primary transmission Msg3 and the retransmission Msg3 by using the same or similar receiving beam adjustment strategy.

It should be noted that, for other beneficial effects of embodiment 3, reference may be made to the effect of embodiment 1, that is, by the method in this embodiment, the network device may determine the uplink beam of the retransmission Msg3 sent by the UE without increasing the indication overhead, so that the retransmission Msg3 may be received by using a more suitable receiving beam. For the case of repeatedly transmitting and retransmitting the Msg3, if the uplink wave beams of each repeatedly transmitted Msg3 are the same, the base station can firstly combine signals and then demodulate the signals, and when the channel is slowly changed, the performance is better than that of demodulating each Msg3 respectively; for the situation that the uplink wave beams of the Msg3 which are repeatedly transmitted are different, the base station can respectively receive and demodulate by using the optimal wave beams, and can obtain wave beam diversity gain when the channel changes fast, so as to improve the coverage performance.

Example 4

This embodiment describes determining the beam of retransmission Msg3 by an indication of the network device. Retransmission Msg3 is scheduled by DCI scrambled with TC-RNTI.

In the first class of methods of this embodiment, the uplink beam sum of the retransmission Msg3 can be determined as in embodiment 2. That is, the method explicitly indicated in embodiment 2 can be used to determine the upstream beam of the retransmission Msg 3: the index of one or more SSBs or PRACH is indicated by one explicit indication information, denoted as second indication information, and the uplink beam of retransmission Msg3 is determined according to the method in embodiment 2.

It should be noted, however, that since retransmission Msg3 is scheduled by TC-RNTI scrambled DCI, not by RAR message, for the method using explicit indication (embodiment 2), the second indication information may be carried in TC-RNTI scrambled DCI (instead of RAR message, or DCI scheduling RAR).

In the second class of methods of this embodiment, the uplink beam of the retransmission Msg3 is associated with the uplink beam of the initial transmission Msg 3. More precisely, by means of an explicit indication, noted as second indication, indicating the index of one or more reference elementary Msg 3; the uplink beam of the retransmission Msg3 is determined according to the uplink beam of the reference primary transmission Msg3 indicated by the second indication information.

The second indication information may indicate only one retransmission Msg3, for example, may indicate an index of one retransmission Msg 3; alternatively, the second indication information may also indicate a plurality of retransmission Msg3, for example, an index of the plurality of retransmission Msg3 by a bitmap, or one of several association patterns.

For example, the second indication information may indicate the initial transmission Msg3 corresponding to the plurality of retransmission Msg3 through a bit map (bitmap). Every K bits in Bitmap are used to indicate a maximum of 2 corresponding to one retransmission Msg3 ^K Which of Msg3 is initially transmitted.

Example 1: when k=2, 4 states {00,01,10,11} which can be represented by bit information in the second indication information correspond to the primary transmission Msg3PUSCH 0, the primary transmission Msg3PUSCH 1, the primary transmission Msg3PUSCH 2, and the primary transmission Msg3PUSCH 3, respectively.

Example 2: assuming that one retransmission Msg3 is repeatedly transmitted 3 times, 2*3 =6 bits are required in total for indicating the primary transmission Msg3PUSCH corresponding to the retransmission Msg3. For example, the second indication information of bitmap= "001110" indicates that the first retransmission Msg3 corresponds to the primary transmission Msg3PUSCH 0 (00), the second retransmission Msg3 corresponds to the primary transmission Msg3PUSCH 3 (11), and the third retransmission Msg3 corresponds to the primary transmission Msg3PUSCH 2 (10).

As another example, the second indication information may indicate one of several association patterns (association pattern). The association pattern refers to a pattern of retransmission Msg3 of the repeated transmission and initial transmission Msg3 associated therewith. The association pattern may be predefined or indicated by the base station through system information broadcast. For example, assuming that one retransmission Msg3 is repeatedly transmitted 3 times, and a total of 4 primary Msg3 PUSCHs (primary Msg3PUSCH 0, primary Msg3PUSCH 1, primary Msg3PUSCH 2, primary Msg3PUSCH 3) several association patterns may be predefined:

Pattern 1= { primary transmission Msg3 PUSCH 0-primary transmission Msg3 PUSCH 1-primary transmission Msg3 PUSCH 2},

pattern 2= { primary transmission Msg3 PUSCH 1-primary transmission Msg3 PUSCH 2-primary transmission Msg3 PUSCH 3},

pattern 3= { primary transmission Msg3 PUSCH 0-primary transmission Msg3 PUSCH 2-primary transmission Msg3 PUSCH 0},

……。

for example, when the second indication information indicates pattern2, 3 retransmission Msg3 of repeated transmission are sequentially associated with the primary transmission Msg3 PUSCH 1, the primary transmission Msg3 PUSCH 2, and the primary transmission Msg3 PUSCH 3, and each retransmission Msg3 may determine an uplink beam according to the primary transmission Msg3 PUSCH associated therewith.

The upstream beam of each retransmission Msg3 is identical to the upstream beam of its associated primary transmission Msg3 (indicated by the second indication information).

By means of the method in the embodiment, the network device can flexibly instruct the UE to transmit the uplink beam when retransmitting the Msg3 according to the requirement, so that the most appropriate receiving strategy can be selected when receiving the retransmission Msg3, for example, combining or joint detection is performed, or beam diversity gain is improved, and coverage performance of the Msg3 is further improved.

It will be appreciated that the method of this embodiment may also be considered as determining the uplink beam of the PRACH by a method of "predefined rules" in combination with "indication of network device", i.e. determining the uplink beam of retransmission Msg3 by "predefined rules and indication of network device".

Referring to fig. 10, an embodiment of the present application provides a transmission apparatus of Msg3, which is applied to a terminal, where the apparatus 1000 includes:

a first processing module 1001, configured to determine an uplink beam of the primary Msg3 or the retransmission Msg3 according to a predefined rule and/or an instruction of the network device;

A first transmitting module 1002, configured to transmit the primary transmission Msg3 through an uplink beam of the primary transmission Msg3, or transmit the retransmission Msg3 through an uplink beam of the retransmission Msg3.

In the embodiment of the application, the terminal can determine the uplink beam of the primary Msg3 or the retransmission Msg3 according to a predefined rule and/or an indication (explicit signaling or implicit signaling) of the network equipment, and the network equipment can select a proper detection scheme according to the determined uplink beam of the Msg3, so that the detection performance of the Msg3 is improved, and the coverage performance of the network equipment is further improved.

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

rule 1-b) if the primary transmission Msg3 or the retransmission Msg3 is a repeated transmission, the uplink beam determining method of the primary transmission Msg3 or the retransmission Msg3 is one of the following:

That is, the primary Msg3 or the uplink beam of the retransmission Msg3 of the repeated transmission may be different; and determining uplink beams of the initial Msg3 or the retransmission Msg3 of a plurality of repeated transmissions according to the SSB selected when the UE initiates random access and the SSB actually sent by the network equipment.

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

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

that is, PRACH is a retransmission and the PRACH uplink beam for each retransmission is at least partially different, and the uplink beam for the initial Msg3 or the retransmission Msg3 for a non-retransmission is the same as the uplink beam for a predefined PRACH (e.g., the first PRACH).

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

(1) RAR information;

(2) Scheduling DCI for RAR;

(3) System messages such as SIB1.

In one embodiment of the present application, the RAR information, DCI scheduling RAR, or system message is used to indicate any one of the following:

(1) One or more indices referencing SSBs;

(2) Index of one or more reference PRACH.

In one embodiment of the application, the indication of the network device comprises a TC-RNTI scrambled DCI in case the uplink beam of the retransmission Msg3 is determined according to the indication of the network device.

(1) One or more indices referencing SSBs;

(2) An index of one or more reference PRACH;

(3) Index of one or more upstream beams referring to the primary Msg 3.

In the embodiment of the present application, the device can implement each process implemented in the embodiment of the method shown in fig. 3 of the present application and achieve the same beneficial effects, and in order to avoid repetition, the description is omitted here.

Referring to fig. 11, an embodiment of the present application provides a receiving apparatus of Msg3, applied to a network device, an apparatus 1100 includes:

a second processing module 1101, configured to determine an uplink beam of the primary Msg3 or the retransmission Msg3 according to a predefined rule; and/or, indicating the uplink beam of the initial transmission Msg3 or the retransmission Msg3 to the terminal;

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

or alternatively, the process may be performed,

Or alternatively, the process may be performed,

or alternatively, the process may be performed,

Or alternatively, the process may be performed,

and indicating the uplink beam of the initial transmission Msg3 to the terminal through one or more of RAR information, DCI for scheduling RAR and system information.

In one embodiment of the present application, the RAR information, DCI scheduling RAR, or system message is used to indicate any one of the following: (1) An index of one or more reference SSBs, or (2) an index of one or more reference PRACH.

(1) One or more indices referencing SSBs;

(2) An index of one or more reference PRACH;

(3) Index of one or more upstream beams referring to the primary Msg 3.

In the embodiment of the present application, the device can implement each process implemented in the embodiment of the method shown in fig. 4 of the present application and achieve the same beneficial effects, and in order to avoid repetition, the description is omitted here.

Optionally, as shown in fig. 12, the embodiment of the present application further provides a communication device 1200, including a processor 1201, a memory 1202, and a program or an instruction stored in the memory 1202 and capable of being executed on the processor 1201, where the program or the instruction implements each process of the embodiment of the method shown in fig. 3 or fig. 4 and can achieve the same technical effects, and is not repeated herein for avoiding repetition.

The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored, where the program or the instruction realizes each process of the method embodiment shown in fig. 3 or fig. 4 and can achieve the same technical effect when executed by a processor, and in order to avoid repetition, a description is omitted herein.

Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium such as a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and the like.

The embodiment of the application further provides a chip, which comprises a processor and a communication interface, wherein the communication interface is coupled with the processor, and the processor is used for running programs or instructions to realize the processes of the embodiment of the information processing method, and can achieve the same technical effects, so that repetition is avoided, and the description is omitted here.

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

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. A message Msg3 sending method, applied to a terminal, characterized by comprising:

2. The method according to claim 1, characterized in that in case the upstream beam of the primary Msg3 or the retransmission Msg3 is determined according to predefined rules, the predefined rules comprise one or more of the following:

3. The method of claim 2, wherein the upstream beam of the primary Msg3 or the retransmission Msg3 is determined according to the SSB selected when the terminal initiates random access, comprising:

Or alternatively, the process may be performed,

or alternatively, the process may be performed,

4. A method according to claim 3, characterized in that the uplink beam of the primary or retransmission Msg3 of the repeated transmission is determined according to one or more of the SSB selected when the terminal initiates random access, the SSB actually transmitted by the network device, comprising:

Or alternatively, the process may be performed,

5. The method according to claim 2, wherein the uplink beam of the primary or retransmission Msg3 is determined according to the PRACH transmitted when the terminal initiates random access, comprising:

or alternatively, the process may be performed,

Or alternatively, the process may be performed,

6. The method of claim 5, wherein the uplink beam of the retransmitted Msg3 or the primary Msg3 for the retransmission is determined based on the uplink beam of the PRACH for the retransmission, comprising:

or alternatively, the process may be performed,

7. The method of claim 1, wherein the predefined rule convention or the indication of the network device is used to indicate: and determining the uplink beam of the retransmission Msg3 according to the uplink beam of the initial transmission Msg 3.

8. The method of claim 7, wherein determining the uplink beam for retransmitting Msg3 based on the uplink beam for initially transmitting Msg3, comprises:

or alternatively, the process may be performed,

9. The method according to claim 1, wherein in case the upstream beam of the primary Msg3 is determined from an indication of the network device, the indication of the network device comprises one or more of the following:

random access response, RAR, information;

scheduling downlink control information DCI of RAR;

A system message;

one or more indices referencing SSBs;

index of one or more reference PRACH.

10. The method according to claim 1, characterized in that in case the uplink beam of retransmission Msg3 is determined from an indication of the network device, the indication of the network device comprises a temporary cell radio network temporary identity TC-RNTI scrambled DCI;

wherein, the TC-RNTI scrambled DCI is used to indicate any one of:

one or more indices referencing SSBs;

an index of one or more reference PRACH;

index of one or more upstream beams referring to the primary Msg3.

11. An Msg3 receiving method applied to a network device, comprising:

receiving the primary transmission Msg3 or receiving the retransmission Msg3.

12. The method according to claim 11, characterized in that in case the upstream beam of the primary Msg3 or the retransmission Msg3 is determined according to predefined rules, the predefined rules comprise one or more of the following:

13. The method of claim 12, wherein the upstream beam of the primary Msg3 or the retransmission Msg3 is determined according to an SSB selected when the terminal initiates random access, comprising:

or alternatively, the process may be performed,

14. The method of claim 13, wherein the uplink beam of the primary Msg3 or the retransmission Msg3 of the repeated transmission is determined according to the SSB selected when the terminal initiates random access, the SSB actually transmitted by the network device, comprising:

or alternatively, the process may be performed,

15. The method of claim 12, wherein the uplink beam for the initial Msg3 or the retransmission Msg3 is determined according to a PRACH transmitted when the terminal initiates random access, comprising:

or alternatively, the process may be performed,

16. The method of claim 15, wherein the uplink beam of the retransmitted Msg3 or the primary Msg3 for the retransmission is determined from the uplink beam of the PRACH for the retransmission, comprising:

Or alternatively, the process may be performed,

17. The method of claim 11, wherein determining the upstream beam of the retransmitted Msg3 according to the predefined rule comprises:

18. The method of claim 17, wherein determining the uplink beam for retransmitting Msg3 based on the uplink beam for initially transmitting Msg3, comprises:

or alternatively, the process may be performed,

19. The method of claim 11, wherein indicating the upstream beam of the primary Msg3 to the terminal comprises:

20. The method of claim 11, wherein indicating to the terminal the uplink beam to retransmit Msg3 comprises:

wherein, the TC-RNTI scrambled DCI is used to indicate any one of:

one or more indices referencing SSBs;

an index of one or more reference PRACH;

index of one or more upstream beams referring to the primary Msg3.

21. A transmission apparatus of Msg3, applied to a terminal, comprising:

22. The apparatus of claim 21, wherein in the event that an upstream beam of primary Msg3 or retransmission Msg3 is determined according to predefined rules, the predefined rules include one or more of:

23. The apparatus of claim 22, wherein the upstream beam of the primary Msg3 or the retransmission Msg3 is determined based on an SSB selected when the terminal initiates random access, comprising:

or alternatively, the process may be performed,

Or alternatively, the process may be performed,

24. The apparatus of claim 23, wherein the uplink beam of the primary Msg3 or the retransmission Msg3 for repeated transmissions is determined based on one or more of an SSB selected when the terminal initiates random access and an SSB actually transmitted by a network device, comprising:

or alternatively, the process may be performed,

25. The apparatus of claim 22, wherein the uplink beam for the initial transmission or retransmission Msg3 is determined according to a PRACH transmitted when the terminal initiates random access, comprising:

or alternatively, the process may be performed,

26. The apparatus of claim 25, wherein the uplink beam of the retransmitted Msg3 or the primary Msg3 for the retransmission is determined based on the uplink beam of the PRACH for the retransmission, comprising:

or alternatively, the process may be performed,

27. The apparatus of claim 21, wherein the predefined rule convention or the indication of the network device is to indicate: and determining the uplink beam of the retransmission Msg3 according to the uplink beam of the initial transmission Msg 3.

28. The apparatus of claim 27, wherein the determining the uplink beam for retransmitting Msg3 based on the uplink beam for initially transmitting Msg3 comprises:

or alternatively, the process may be performed,

29. A receiving apparatus of Msg3, applied to a network device, comprising:

30. The apparatus of claim 29, wherein in the event that an upstream beam of primary Msg3 or retransmission Msg3 is determined according to predefined rules, the predefined rules include one or more of:

31. The apparatus of claim 30, wherein the upstream beam of the primary Msg3 or the retransmission Msg3 is determined based on an SSB selected when the terminal initiates random access, comprising:

or alternatively, the process may be performed,

32. The apparatus of claim 31, wherein the uplink beam of the primary Msg3 or the retransmission Msg3 for repeated transmissions is determined based on an SSB selected when the terminal initiates random access, and an SSB actually transmitted by a network device, comprising:

or alternatively, the process may be performed,

33. The apparatus of claim 30, wherein the uplink beam for the initial Msg3 or the retransmission Msg3 is determined according to a PRACH transmitted when the terminal initiates random access, comprising:

or alternatively, the process may be performed,

34. The apparatus of claim 33, wherein the uplink beam of the retransmitted Msg3 or the primary Msg3 for the retransmission is determined based on the uplink beam of the PRACH for the retransmission, comprising:

Or alternatively, the process may be performed,

35. A communication device, comprising: a processor, a memory and a program stored on the memory and executable on the processor, which when executed by the processor performs the steps of the method according to any one of claims 1 to 20.

36. A readable storage medium, characterized in that it stores thereon a program or instructions which, when executed by a processor, implement the steps of the method according to any of claims 1 to 20.