Method, system and terminal for determining time-frequency resources for Msg1 repetitive transmission

Abstract

The present application discloses a method, device, and terminal for determining time-frequency resources for Msg1 repeated transmission, which belong to the technical field of communications. A method for determining time-frequency resources for Msg1 repeated transmission in an embodiment of the present application includes a step of a terminal receiving a first message, which is transmitted from a network side device and carries first configuration information for Msg1 repeated transmission, and a step of the terminal determining a first time-frequency resource for Msg1 repeated transmission based on the first configuration information. The step of determining the first time-frequency resource for Msg1 repeated transmission includes at least one of the following steps: determining whether to perform Msg1 repeated transmission; determining a physical random access channel (PRACH) resource for Msg1 repeated transmission; and determining a frequency hopping parameter for Msg1 repeated transmission.

Description

[Technical Field]

[0001] The present application relates to the technical field of communications, and in particular to a method, device, and terminal for determining time-frequency resources for Msg1 repetitive transmission. [Background technology]

[0002] NR supports two types of random access procedures: the 4-step RA type (4-step RACH) of Msg1 and the 2-step RA type (2-step RACH) of MsgA. Both types of RA procedures support contention-based random access (CBRA) and contention-free random access (CFRA). The 2-step RACH procedure is generally applied in areas with good coverage and shortens terminal access time. In areas with poor signal coverage, terminals should access the cell using the 4-step RACH procedure.

[0003] In related art, Msg1 is transmitted in a single transmission, and a Random Access Response (RAR) monitoring window is turned on after Msg1 is transmitted. The single transmission of Msg1 is limited by coverage performance, and there is a problem that the success rate of Msg1 detection is low at the cell boundary, which may affect the access of terminals at the cell boundary to the cell. Repeated transmission of Msg1 is a method to improve the coverage performance of the Physical Random Access Channel (PRACH), but how to implement repeated transmission of Msg1 needs to be solved. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments of the present application provide a method, device and terminal for determining time-frequency resources for Msg1 repetitive transmission, which can solve the problem of how to realize Msg1 repetitive transmission. [Means for solving the problem]

[0005] In a first aspect, a method for determining a time-frequency resource for Msg1 repetition transmission applied to a terminal, comprising: A terminal receives a first message transmitted from a network side device, the first message carrying first configuration information for repeated transmission of Msg1; determining, by the terminal, a first time-frequency resource for repeated transmission of Msg1 based on the first configuration information; The step of determining a first time-frequency resource for repeated transmission of Msg1 includes: determining whether to perform repeated transmission of Msg1; determining a Physical Random Access Channel (PRACH) resource for Msg1 repetition transmission; determining a frequency hopping parameter for the Msg1 repeated transmission.

[0006] In a second aspect, a method for determining a time-frequency resource for Msg1 repetitive transmission applied to a network side device, comprising: A method for determining time-frequency resources for repeated Msg1 transmission is provided, the method including a step of a network side device transmitting a first message carrying first configuration information for repeated Msg1 transmission to a terminal.

[0007] In a third aspect, a first receiving unit used to receive a first message including first arrangement information for Msg1 repeated transmission, the first message being transmitted from a network side device; a first determination unit used to determine a first time-frequency resource for repeated transmission of Msg1 based on the first configuration information, determining a first time-frequency resource for repeated transmission of Msg1; determining whether to perform repeated transmission of Msg1; determining a physical random access channel (PRACH) resource for repeated transmission of Msg1; and determining a frequency hopping parameter for the Msg1 repeated transmission.

[0008] In a fourth aspect, A device for determining time-frequency resources for repeated Msg1 transmission is provided, which includes a first transmission unit used to transmit a first message carrying first configuration information for repeated Msg1 transmission to a terminal.

[0009] In a fifth aspect, there is provided a terminal comprising a processor and a memory, wherein a program or command executable by the processor is stored in the memory, and when the program or command is executed by the processor, the terminal realizes the steps of the method for determining time-frequency resources for Msg1 repetitive transmission described in the first aspect.

[0010] In a sixth aspect, a terminal is provided, the terminal comprising: a communication interface used to receive a first message transmitted from a network side device, the first message including first configuration information for Msg1 repeated transmission; and a processor used to determine a first time-frequency resource for Msg1 repeated transmission based on the first configuration information, wherein determining the first time-frequency resource for Msg1 repeated transmission includes at least one of determining whether to perform Msg1 repeated transmission, determining a physical random access channel (PRACH) resource for Msg1 repeated transmission, and determining a frequency hopping parameter for Msg1 repeated transmission.

[0011] In a seventh aspect, there is provided a network side device comprising a processor and a memory, wherein a program or command executable by the processor is stored in the memory, and when the program or command is executed by the processor, the network side device realizes the steps of the method for determining time-frequency resources for Msg1 repetitive transmission described in the second aspect.

[0012] In an eighth aspect, there is provided a network side device including a processor and a communication interface used for transmitting a first message carrying first arrangement information for Msg1 repeated transmission to a terminal.

[0013] In a ninth aspect, there is provided a system for determining a time-frequency resource for Msg1 repeated transmission, comprising: a terminal used to execute the steps of the method for determining a time-frequency resource for Msg1 repeated transmission described in the first aspect; and a network side device used to execute the steps of the method for determining a time-frequency resource for Msg1 repeated transmission described in the second aspect.

[0014] In a tenth aspect, there is provided a readable storage medium having a program or command stored thereon, which, when executed by a processor, implements the steps of the method for determining time-frequency resources for Msg1 repeated transmission described in the first aspect, or the steps of the method for determining time-frequency resources for Msg1 repeated transmission described in the second aspect.

[0015] In an eleventh aspect, there is provided a chip comprising a processor and a communication interface, wherein the communication interface and the processor are coupled, and the processor executes a program or command to realize the method for determining time-frequency resources for Msg1 repeated transmission described in the first aspect, or the method for determining time-frequency resources for Msg1 repeated transmission described in the second aspect.

[0016] In a twelfth aspect, there is provided a computer program / program product stored on a storage medium, which is executed by at least one processor to implement the steps of the method for determining time-frequency resources for Msg1 repeated transmission described in the first aspect, or the steps of the method for determining time-frequency resources for Msg1 repeated transmission described in the second aspect. [Effects of the Invention]

[0017] In an embodiment of the present application, the terminal determines a first time-frequency resource for Msg1 repeated transmission based on first configuration information for Msg1 repeated transmission transmitted from a network side device, thereby realizing Msg1 repeated transmission and improving the coverage performance of the PRACH. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a block diagram of a wireless communication system to which an embodiment of the present application can be applied. [Figure 2]1 is a flowchart 1 of a method for determining time-frequency resources for Msg1 repeated transmission provided in an embodiment of the present application; [Figure 3] FIG. 10 is an exemplary diagram for determining the time-domain location of ROs of Msg1 repeated transmissions associated with the same SSB provided in an embodiment of the present application. [Figure 4] FIG. 10 is an exemplary diagram for determining the time-domain location of ROs of Msg1 repetition transmissions associated with different SSBs provided in an embodiment of the present application. [Figure 5] 1 is a schematic diagram of RO frequency hopping provided in the examples of the present application. [Figure 6] 2 is a schematic diagram of RO frequency hopping provided in the examples of the present application. [Figure 7] 2 is a flowchart 2 of a method for determining time-frequency resources for repeated transmission of Msg1 provided in an embodiment of the present application; [Figure 8] 1 is a schematic diagram of the configuration of a device for determining time-frequency resources for Msg1 repetition transmission provided in an embodiment of the present application; [Figure 9] FIG. 2 is a schematic diagram 2 of the configuration of the device for determining time-frequency resources for Msg1 repeated transmission provided in an embodiment of the present application; [Figure 10] 1 is a schematic diagram of the configuration of a communication device provided in an embodiment of the present application; [Figure 11] FIG. 2 is a schematic diagram of the hardware configuration of a terminal that realizes an embodiment of the present application. [Figure 12] FIG. 2 is a schematic diagram of the configuration of a network-side device provided in an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, the technical solutions in the embodiments of the present application will be clearly explained with reference to the drawings in the embodiments of the present application, and it should be understood that the described embodiments are only a part of the embodiments of the present application, not all of the embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments in the present application are all within the scope of protection of the present application.

[0020] The terms "first," "second," and the like in the specification and claims of this application are not intended to describe a particular order or precedence order, but rather to distinguish between similar objects. It should be understood that terms used in this manner may be interchanged where appropriate so that the embodiments of this application can be implemented in an order other than that illustrated or described herein. Furthermore, the objects distinguished by "first" and "second" generally refer to one type and do not limit the number of objects; for example, the first object may be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the " / " symbol generally indicates that the related objects before and after are in an "or" relationship.

[0021] It should be noted that the techniques described in the embodiments of the present application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, and can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single-Carrier Frequency Division Multiple Access (SC-FDMA), etc. The terms "system" and "network" in the embodiments of the present application are generally interchangeable, and the described techniques may be used for the above-mentioned systems and wireless technologies, or for other systems and wireless technologies. However, for illustrative purposes, the following description will describe a New Radio (NR) system, and NR terminology will be used in most of the following description, but these technologies are applicable to systems other than NR systems, such as 6th Generation (6G) communication systems.

[0022] 1 is a block diagram of a wireless communication system to which the present invention can be applied. The wireless communication system includes a terminal 11 and a network side device 12. Here, the terminal 11 may be a terminal-side device such as a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (also called a notebook computer), a personal digital assistant (PDA), a personal digital assistant (PDA), a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, a vehicle-mounted equipment (VUE), a pedestrian-mounted equipment (PUE), a smart home (home equipment with wireless communication functions such as a refrigerator, a television, a washing machine, or furniture), a game console, a personal computer (PC), an automated teller machine, or a kiosk terminal, and wearable devices include a smart watch, a smart band, a smart earphone, a smart glass, a smart accessory (smart bracelet, smart wristband, smart ring, smart necklace, smart anklet, smart ankle accessory, etc.), a smart wristband, a smart clothing, etc. It should be noted that the embodiments of the present application are not limited to a specific type of the terminal 11. The network side equipment 12 may include access network equipment or core network equipment, where the access network equipment 12 may also be referred to as radio access network equipment, radio access network (RAN), radio access network function, or radio access network unit.The access network equipment 12 may include a base station, a WLAN access point, a WiFi node, or the like. The base station may be referred to as a Node B, an evolved Node B (eNB), an access point, a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home B node, a home evolved B node, a transmitting receiving point (TRP), or any other appropriate term in the field. As long as the same technical effect can be achieved, the base station is not limited to a specific technical term. In the embodiments of the present application, only a base station in an NR system is introduced as an example, but it should be noted that the specific type of base station is not limited.Core network devices include core network nodes, core network functions, mobility management entities (MMEs), access and mobility management functions (AMFs), session management functions (SMFs), user plane functions (UPFs), policy control functions (PCFs), policy and charging rules functions (PCRFs), edge application server discovery functions (EASDFs), unified data management (UDMs), unified data repository (UDRs), home subscriber servers (HSSs), centralized network configuration (CNCs), network repository functions (NRFs), network exposure functions (NEFs), local NEFs (Local NEFs or L-NEFs), binding support functions (BSFs), and application functions (Application Node Functions). The present application may include, but is not limited to, at least one of the following: a core network device in an NR system, a QoS control function (QoS control function), ...

[0023] Hereinafter, with reference to the drawings, a method, device and terminal for determining time-frequency resources for Msg1 repetitive transmission provided in the embodiments of the present application will be described in detail through several embodiments and use cases thereof.

[0024] First, the contents related to this application will be introduced.

[0025] The 5G NR Rel-15 / 16 system defines two types of random access procedures: a four-step random access channel (4-step RACH) and a two-step random access channel (2-step RACH). The four-step RACH is applicable to access anywhere within the cell coverage area, while the two-step RACH is applicable to access only in areas close to the base station or when signal quality is good. In the four-step RACH, the UE first transmits Msg1 to the network. Msg1 occupies a predefined time-frequency resource and includes a preamble. After transmitting Msg1, the UE monitors the PDCCH during the RAR time window and receives a random access response (RAR) scheduled on the PDCCH scrambled with the RA-RNTI using the fallback DCI format, DCI format 1_0. If the preamble index in the RAR is the same as the preamble index sent by the UE, the RAR is considered to have been received successfully. At this time, the UE stops monitoring the RAR and may transmit Msg3 as instructed by the UL grant included in the RAR. Msg3 is transmitted on the UL-SCH, HARQ is used, the PDCCH is scrambled with the TC-RNTI indicated in the RAR, and retransmission of Msg3 is scheduled using the fallback DCI format 0_0. Msg3 contains a unique UE identifier, which is used for collision resolution in step 4.After receiving Msg3, the network schedules Msg4 using the PDCCH scrambled with TC-RNTI. When the UE successfully decodes and finds that the UE Contention Resolution Identity MAC control element included in Msg4 matches the UE Contention Resolution Identity sent in Msg3, the UE considers the random access successful and sets its C-RNTI to TC-RNTI, that is, the four-step random access is completed.

[0026] After completing downlink synchronization and cell search procedures, the terminal receives and detects SSB signals during the initial downlink BWP and obtains the signal quality (e.g., SS-RSRP) of different SSBs before performing a random access procedure. The terminal determines the path loss quality according to the SSB signal quality and determines whether to perform 4-step RACH or 2-step RACH by referring to the threshold msgA-RSRP-Threshold. The terminal selects an SSB according to the threshold rsrp-ThresholdSSB indicated in the system message SIB1. If there is an SSB (or multiple SSBs) with SS-RSRP higher than the threshold, the terminal selects one SSB from those higher than the threshold as the correlation SSB for the random access procedure. If the signal qualities of all SSBs are lower than the threshold, the terminal may select any one SSB as the correlation SSB for the random access procedure. The specific SSB selection method is implemented by the terminal.

[0027] In an NR system, a base station may configure multiple PRACH transmission occasions (also called PRACH occasions) for frequency division multiplexing (FDM) at one time domain location, which is abbreviated as RO in this application for simplicity. The number of ROs capable of performing FDM at one time instance may be {1, 2, 4, 8}.

[0028] The random access preamble (RACH preamble) can be transmitted only on the time domain resources configured by the parameter PRACHConfigurationIndex, and the random access preamble can be transmitted only on the frequency domain resources configured by the parameter prach-FDM. n RA ∈{0, 1, ..., M-1}, where M is equal to the higher layer parameter prach-FDM. At the time of initial access, PRACH frequency domain resource n RA are numbered in ascending order starting from the RO resource with the lowest frequency in the initial active uplink bandwidth part, otherwise PRACH frequency domain resource n RA The numbers are numbered in ascending order starting from the RO resource with the lowest frequency within the active uplink bandwidth part.

[0029] In NR, an RO correlates with the SSB (SS / PBCH block, synchronization signal / physical broadcast channel block, sometimes abbreviated as SS block or synchronization signal block) that it actually transmits. Multiple SSBs may be associated with one RO, and multiple SSBs may be associated with one RO. The correlation between SSBs and ROs is configured by the parameters ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

[0030] Because the terminal transmission power is limited and much lower than the network transmission power, in cell boundary areas or areas with limited coverage, the terminal's uplink signal coverage performance is inferior to the downlink signal coverage, i.e., the coverage performance of Msg1 and Msg3 is inferior to the coverage performance of Msg2 and Msg4. In the high frequency band FR2, the difference in coverage performance between uplink and downlink channels is more significant. To improve the uplink signal coverage performance, it is possible to introduce uplink signal repeated transmission into the random access procedure, i.e., to improve the coverage performance by using the multiple / repeated transmission method of Msg1 (PRACH).

[0031] When Msg1 is repeated, multiple Msg1 signals may be associated with the same SSB / Channel State Information-Reference Signal (CSI-RS) or different SSBs / CSI-RSs. When Msg1 repeated transmissions are associated with the same SSB / CSI-RS, assuming that the SSB / CSI-RS beam selected by the UE is the optimal beam, the optimal beam is selected according to existing protocol definition rules. However, Msg1 repeated transmissions associated with a single SSB / CSI-RS take longer to complete. In limited coverage, SSB beams are generally fixed wide beams, so there may be overlapping areas between SSB beams. In this case, the signal quality SS-RSRPs of multiple SSBs detected by the UE may be close, and selecting one SSB beam for random access means discarding other possible SSB beams. Selecting PRACH resources associated with multiple SSBs to transmit Msg1 may improve the base station's probability of successfully detecting Mg1. In addition, since the measurement of SS reference signal received power (SS-RSRP) in the random access phase is determined only by the result of a single SSB measurement, there may be measurement deviation in the SS-RSRP measurement result. Therefore, by selecting multiple SSBs and transmitting Msg1, the impact of SSB measurement deviation on SSB selection can be reduced. Generally, Msg1 associated with different SSBs is transmitted in different uplink beams, and the UE can also perform repeated PRACH transmission using a beam matching the SSB in the RO of the associated SSB.

[0032] Furthermore, as can be seen from the RO resource allocation method, multiple ROs can be frequency-division multiplexed within one time resource. During Msg1 repeated transmission, multiple time resources determined by multiple Msg1s each include multiple frequency-division multiplexed RO resources. The system needs to define a rule for selecting RO resources so that the base station and the terminal have the same understanding of the RO resource combination for Msg1 repeated transmission and avoid the complexity of the base station detecting Msg1 repeated transmission.

[0033] The embodiment of the present application provides a method for determining time-frequency resources for Msg1 repetitive transmission.

[0034] 2 is a flowchart 1 of a method for determining time-frequency resources for repeated transmission of Msg1 provided in an embodiment of the present application. As shown in FIG. 2, the method includes the following steps 200 and 201:

[0035] In step 200, the terminal receives a first message sent from a network side device, the first message carrying first configuration information for repeated transmission of Msg1.

[0036] Optionally, the first message includes at least one of a system message, a Downlink control information (DCI), a Media Access Control Control Element (MAC CE), and a Radio Resource Control (RRC) signaling.

[0037] For example, the terminal receives a first message carried in a system message SIB1 and transmitted by a network side device.

[0038] The first message contains first arrangement information for instructing the terminal on the arrangement of repeated transmission of Msg1 by the network side device.

[0039] In step 201, the terminal determines a first time-frequency resource for repeated transmission of Msg1 based on the first configuration information.

[0040] wherein the step of determining the first time-frequency resource for repeated transmission of Msg1 includes: determining whether to perform repeated transmission of Msg1; determining a Physical Random Access Channel (PRACH) resource for Msg1 repetition transmission; and determining frequency hopping parameters for Msg1 repeated transmission.

[0041] The first time-frequency resource includes a plurality of ROs of different time periods associated with the same downlink signal SSB / CSI-RS or a plurality of downlink signals SSB / CSI-RS.

[0042] It can be understood that the terminal determines whether the current cell supports Msg1 repeat transmission based on the first configuration information, and the first configuration information further indicates whether to perform Msg1 repeat transmission.

[0043] When it is determined that Msg1 repeated transmission is to be performed, a frequency hopping parameter for Msg1 repeated transmission is further determined based on the first configuration information.

[0044] Furthermore, the PRACH resource for the repeated Msg1 transmission is determined according to the frequency hopping parameters of the repeated Msg1 transmission, that is, the RO corresponding to each repeated Msg1 transmission is determined.

[0045] It should be noted that the RO corresponding to each Msg1 transmission among the Msg1 repetitions includes the time domain location and frequency domain location of the RO resource corresponding to each Msg1 transmission among the Msg1 repetitions.

[0046] As can be seen, in the high frequency band, FR2, base stations generally communicate using analog beams, i.e., at each time, a base station can only transmit signals in one analog beam direction or receive signals in one analog beam direction. Therefore, when performing random access, multiple ROs at one time domain location should be associated with the same analog SSB beam. In FR2, when one SSB is associated with multiple ROs, another frequency diversity gain can be obtained by RO frequency hopping.

[0047] As can be understood, when the first configuration information includes indication information related to RO frequency hopping, the terminal can determine frequency hopping parameters for Msg1 repeated transmission based on the indication information related to the frequency hopping, thereby selecting ROs at different frequency positions with different RO indexes in the frequency domain during Msg1 repeated transmission to obtain frequency diversity gain.

[0048] Frequency hopping can achieve frequency diversity gain and avoid complete overlap of time-frequency resources between resources used for different Msg1 repetitions, thereby improving the coverage performance of the PRACH and reducing the complexity of PRACH resource allocation.

[0049] Optionally, when the first configuration information does not include indication information related to RO frequency hopping or the first configuration information indicates that frequency hopping is not performed, the step of determining a first time-frequency resource for the repeated Msg1 transmission by the terminal includes the steps of: determining to perform repeated Msg1 transmission; determining a Physical Random Access Channel (PRACH) resource for the repeated Msg1 transmission; and determining an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions according to the Physical Random Access Channel (PRACH) resource for the repeated Msg1 transmission.

[0050] Optionally, if the terminal determines not to perform repeated transmission of Msg1 based on the first configuration information, it does not perform the subsequent procedures.

[0051] It can be seen that after the terminal determines the first time-frequency resource for repeated transmission of Msg1, it transmits Msg1 on the first time-frequency resource.

[0052] In an embodiment of the present application, the terminal determines a first time-frequency resource for Msg1 repeated transmission based on first configuration information for Msg1 repeated transmission transmitted from a network side device, thereby realizing Msg1 repeated transmission and improving the coverage performance of the PRACH.

[0053] Optionally, the first arrangement information includes at least one of the following 1) to 11).

[0054] 1) Msg1 repeat transmission pattern.

[0055] Optionally, the pattern of the Msg1 repeat transmission is: Multiple ROs are associated with the same SSB, or It includes patterns where multiple ROs are associated with different SSBs.

[0056] Here, the pattern in which multiple ROs are associated with different SSBs refers to a pattern in which multiple ROs are associated with multiple SSBs.

[0057] Optionally, one of the above patterns may be set as the default pattern by default according to a rule predefined in the protocol, for example, a pattern in which multiple ROs are associated with the same SSB by default to perform Msg1 repetition transmission.

[0058] 2) Multiple SSB combinations.

[0059] It should be noted that multiple ROs may be associated with different SSBs, and different SSBs may correspond to multiple SSB combinations, and thus the first configuration information further includes multiple SSB combinations used in the Msg1 repeat transmission pattern associated with multiple SSBs. In one possible indication implementation, the first configuration information indicates all SSB combinations at once in the form of a bit map or index sequence, or determines other SSB combinations based on the first SSB combination, for example, the index of the second SSB combination is the sum of the index of the first SSB combination and a specific offset.

[0060] In a practical deployment, multiple SSBs may use the same transmission beam, and the base station instructs multiple SSBs in the same beam to transmit Msg1 repeatedly.

[0061] 3) The configuration parameters of the correlation between SSB and RO.

[0062] As can be seen, the SSB to RO correlation configuration parameter is used to indicate the correlation between the SSB and RO.

[0063] The correlation between an SSB and an RO includes the correlation between one SSB and multiple ROs or the correlation between one RO and multiple SSBs.

[0064] For example, the SSB-to-RO correlation configuration parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB indicates that one SSB is associated with X consecutive ROs, where X is an integer greater than 1.

[0065] In an embodiment of the present application, optionally, when the RO frequency hopping offset is not explicitly configured in the first message, the RO frequency hopping offset can be determined by the configuration parameters of the correlation between the SSB and the RO.

[0066] 4) A first threshold value for indicating the trigger threshold for Msg1 repeated transmission.

[0067] In one embodiment, the terminal determines whether to perform repeated Msg1 transmission according to a trigger threshold for repeated Msg1 transmission.

[0068] The first threshold may be a trigger threshold for independently arranged Msg1 repeated transmission, or may also serve as a threshold for determining whether or not to execute a random access procedure for Msg3 repeated transmission.

[0069] Here, the threshold value for determining whether or not to execute the random access procedure for repeated Msg3 transmission is the trigger threshold value for the random access procedure for repeated Msg3 transmission.

[0070] 5) A second threshold for indicating the selection threshold of the correlation SSB for Msg1 repeated transmission.

[0071] In one embodiment, the terminal selects the correlated SSBs of the Msg1 repeated transmission according to a selection threshold of the correlated SSBs of the Msg1 repeated transmission.

[0072] The correlated SSB of a repeated Msg1 transmission is the SSB that is associated with the repeated Msg1 transmission.

[0073] The second threshold may be an independently arranged threshold for selecting correlated SSBs for repeated Msg1 transmission, or may also serve as a threshold for selecting correlated SSBs during the random access procedure for repeated Msg3 transmission.

[0074] Here, the threshold for selecting the correlated SSB in the random access procedure of Msg3 repeated transmission is the correlation SSB selection threshold of the random access procedure of Msg3 repeated transmission.

[0075] 6) Whether to enable RO frequency hopping.

[0076] It can be understood that when the network side device instructs to enable RO frequency hopping, it means that it supports frequency hopping in the frequency domain of the RO resource for Msg1 repetitive transmission.

[0077] If the network side device instructs not to enable RO frequency hopping, it means that it does not support frequency hopping in the frequency domain of the RO resource for Msg1 repetitive transmission.

[0078] 7) RO frequency hopping offset.

[0079] Optionally, when RO frequency hopping is enabled, the network side device further indicates an RO frequency hopping offset, RO offset.

[0080] The RO frequency hopping offset is in units of RO.

[0081] 8) Number of frequency hops or frequency hopping step size.

[0082] Optionally, the network side device configures the step size of the RO frequency hopping.

[0083] For example, RO frequency hopping is performed every n Msg1 transmissions, where n is the step size of RO frequency hopping.

[0084] Optionally, when the RO frequency hopping step size is not explicitly configured, the step size defaults to 1, i.e., one RO frequency hop is performed each time Msg1 is sent.

[0085] 9) Number of times Msg1 is repeated.

[0086] It should be noted that the number of times to repeat transmission of Msg1 may be indicated by the first configuration information or may be determined by a value predefined in the protocol. Optionally, a set of repeat transmission times including multiple selectable values ​​is configured in the first configuration information, and the terminal selects the actual number of times to repeat transmission of Msg1 according to the channel quality.

[0087] 10) Msg1: Preamble resource set for repeated transmission.

[0088] 11) RO mask for Msg1 repeat transmission.

[0089] Optionally, the first configuration information may further include an RO mask for Msg1 repetition transmission.

[0090] It should be noted that when the network side device configures the RO mask, the terminal needs to select an RO frequency hopping according to the RO and RO offset from the valid RO set indicated by the RO mask. Furthermore, the first configuration information may optionally include multiple RO masks, each corresponding to a different number of repeated transmissions of Msg1.

[0091] Optionally, the step of determining whether to perform Msg1 repeated transmission and determining a Physical Random Access Channel (PRACH) resource for Msg1 repeated transmission comprises: determining to perform repeated Msg1 transmission when a first condition is satisfied, and determining a PRACH resource for the repeated Msg1 transmission; Here, the first condition is: The four-step random access fails N times, where the value of N is predefined in a protocol or configured by the first message, and the four-step random access is a four-step random access procedure with one transmission of Msg1 and one transmission of Msg3, and / or a four-step random access procedure with one transmission of Msg1 and repeated transmission of Msg3; receiving first signaling, which is used to instruct a terminal to perform Msg1 repeated transmission and carries instruction information related to RO frequency hopping, and the first signaling may be DCI, MAC CE, or RRC signaling; the signal quality of the downlink signal is equal to or lower than the first threshold; Here, the first threshold value is set by the first message, or is used as a threshold value for determining whether or not to execute a random access procedure for repeated transmission of Msg3.

[0092] The terminal's decision to perform Msg1 repetition transmission includes the following cases:

[0093] Case 1: If the 4-step random access fails N times, Msg1 is repeatedly transmitted.

[0094] Optionally, the failure of the four-step random access N times In one four-step random access procedure, the terminal attempts to send Msg1 once N times but does not receive the corresponding Msg2, or In one four-step random access procedure, the terminal sends Msg1 once and receives the corresponding Msg2 N times, but fails to transmit Msg3; Here, the value of N is either predefined in the protocol or configured by the first message.

[0095] N can be understood as a threshold value, and in a four-step random access procedure, if a terminal attempts to send Msg1 once N times but does not receive the corresponding Msg2, the terminal will perform repeated transmission of Msg1 when attempting random access for the N+1th time; or if a terminal sends Msg1 once N times and receives the corresponding Msg2 but fails to transmit Msg3, the terminal will perform repeated transmission of Msg1 when attempting random access for the N+1th time.

[0096] Case 2: When the terminal receives the first signaling, it performs Msg1 repeat transmission, where the first signaling is used to instruct the terminal to perform Msg1 repeat transmission and carries instruction information related to RO frequency hopping.

[0097] As can be seen, the network side device may explicitly instruct the terminal to perform repeated transmission of Msg1.

[0098] Here, the indication information related to RO frequency hopping includes at least one of whether to enable RO frequency hopping, RO frequency hopping offset, frequency hopping number, or frequency hopping step size.

[0099] Optionally, the first signaling includes DCI or MAC CE or RRC signaling.

[0100] Case 3: When the signal quality of the downlink signal is equal to or lower than the first threshold, the terminal performs repeated transmission of Msg1.

[0101] Here, the first threshold value may be set by the first message, or may also serve as a threshold value for determining whether or not to execute the random access procedure for repeated transmission of Msg3.

[0102] Optionally, the downlink signal may be SSB or CSI-RS.

[0103] Furthermore, the downlink signal may be one or more downlink reference signals SSB or CSI-RS selected by the terminal, for example, the SSB with the largest RSRP.

[0104] The signal quality of the downlink signal may be RSRP, which indicates path loss, or reference signal received quality (RSRQ), or signal-to-noise and interference ratio (SINR).

[0105] When the signal quality of the downlink signal is lower than the first threshold T0, the terminal performs repeated transmission of Msg1; otherwise, the terminal performs one-time transmission of Msg1.

[0106] For example, in one implementation, if the signal qualities (RSRP or RSRQ or SINR) of all SSB / CSI-RS are lower than a first threshold T0, i.e., the maximum value of the signal qualities of all SSB / CSI-RS is selected and compared with the first threshold T0, and if the maximum value is less than or equal to the first threshold T0, repeated transmission of Msg1 is performed; otherwise, a single transmission of Msg1 is performed.

[0107] To perform repeated Msg1 transmission, it is first necessary to determine / select a PRACH resource for repeated Msg1 transmission. How to determine a PRACH resource for repeated Msg1 transmission will be described below.

[0108] Optionally, the step of determining PRACH resources for repeated transmission of Msg1 includes steps 300, 301 and 302.

[0109] In step 300, an SSB or a combination of SSBs associated with the Msg1 repeated transmission is determined according to the pattern of the Msg1 repeated transmission and a second threshold value.

[0110] Here, the second threshold value is set by the first message, or is also used as the threshold value for selecting correlated SSBs during the random access procedure of Msg3 repeated transmission.

[0111] It should be noted that the SSB in the embodiments of the present application may be replaced by other downlink reference signals such as CSI-RS. The SSB combination in the embodiments of the present application may be replaced by other downlink reference signal combinations such as CSI-RS combinations. The embodiments of the present application will be described taking the SSB as an example, but are not limited to the SSB.

[0112] In a pattern of Msg1 repetitive transmission in which a plurality of ROs are associated with the same SSB, the step of determining an SSB associated with the Msg1 repetitive transmission based on the pattern of the Msg1 repetitive transmission and the second threshold value includes: a step of the terminal comparing the signal qualities of all detected SSBs with the second threshold and selecting an SSB having a signal quality higher than the second threshold as an SSB related to the Msg1 repeated transmission; Alternatively, when there are a plurality of SSBs whose signal quality is higher than the second threshold, selecting one SSB from the plurality of SSBs by the terminal or randomly as an SSB related to the Msg1 repeated transmission; Alternatively, if there is no SSB whose signal quality is higher than the second threshold, the method includes a step of selecting, by the terminal or randomly, one SSB as the SSB associated with the Msg1 repeated transmission.

[0113] Optionally, in a pattern of Msg1 repetitive transmission in which a plurality of ROs are associated with different SSBs, the step of determining an SSB combination associated with the Msg1 repetitive transmission according to the pattern of the Msg1 repetitive transmission and the second threshold value includes: The method includes the step of comparing the signal quality of the SSB combinations with the second threshold value and selecting one of the SSB combinations as the SSB combination associated with the Msg1 repeated transmission.

[0114] Here, the signal quality of the SSB combination may be the result of the best signal quality among the SSB combinations, or the result of the worst signal quality among them, or the weighted result of the signal quality of each SSB, and may be specified by the protocol or configured by the network.

[0115] Optionally, the terminal selects one SSB combination, the signal quality of which is higher than a second threshold, from among the plurality of SSB combinations as the SSB combination associated with the Msg1 repeated transmission.

[0116] Alternatively, if there are multiple SSB combinations whose signal quality is higher than the second threshold, one SSB combination from the multiple SSB combinations is selected by the terminal or randomly as the SSB combination associated with the Msg1 repeated transmission.

[0117] Alternatively, if there is no SSB combination among the plurality of SSB combinations whose signal quality is higher than the second threshold, one SSB combination is selected by the terminal or one SSB combination is randomly selected from the plurality of SSB combinations as the SSB combination associated with the Msg1 repeated transmission.

[0118] Furthermore, the terminal determines the number of times to repeat transmission of Msg1 according to the signal quality of SSB or SSB combination.

[0119] In step 301, a set of candidate ROs of PRACH resources for the repeated Msg1 transmission is determined according to a correlation between the SSB or SSB combination and the ROs associated with the repeated Msg1 transmission.

[0120] As can be understood, after the terminal determines the SSB or SSB combination associated with the Msg1 repeated transmission, it can determine an RO set corresponding to the SSB or SSB combination associated with the Msg1 repeated transmission according to the correlation between the SSB and the RO, and the RO set corresponding to the SSB or SSB combination associated with the Msg1 repeated transmission can be set as a candidate RO set of PRACH resources for the Msg1 repeated transmission, or select multiple ROs in the RO set as multiple ROs for the Msg1 repeated transmission.

[0121] In step 302, the RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions is determined.

[0122] In an embodiment of the present application, the terminal determines an SSB or SSB combination associated with the Msg1 repeated transmission according to the pattern of the Msg1 repeated transmission and the second threshold, and then determines a PRACH resource for the Msg1 repeated transmission based on the correlation between the SSB or SSB combination and the RO. Subsequently, the terminal determines an RO corresponding to each Msg1 transmission among the Msg1 repeated transmissions based on the PRACH resource, thereby realizing the Msg1 repeated transmission and improving the PRACH coverage performance.

[0123] Optionally, the step of determining an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions includes step 400 and step 401 .

[0124] In step 400, the time domain location of the RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions is determined.

[0125] It can be understood that the terminal first determines the time-domain locations of the multiple ROs for the repeated transmission of Msg1, and then selects one RO from the multiple ROs in the same time-domain resource according to a frequency hopping parameter such as an RO frequency hopping offset (RO offset) as the first time-frequency resource for the repeated transmission of Msg1.

[0126] Optionally, determining a time domain location of an RO corresponding to each Msg1 transmission of the Msg1 repeated transmissions comprises: In a pattern of Msg1 repeated transmission in which multiple ROs are associated with the same SSB, the time domain positions of the multiple ROs in the Msg1 repeated transmission correspond to correlation periods between the ROs and consecutive multiple SSBs.

[0127] Here, the correlation period corresponding to the first Msg1 of the repeated Msg1 transmission is determined by the reference time point, that is, the RO associated with the SSB in the first correlation period from the reference time point is the RO corresponding to the first Msg1 transmission.

[0128] The reference instant may be predefined in the protocol or determined by the first message placement, for example, the reference instant may be the start time of frame=0 or the start time of an association pattern period.

[0129] 3 is an exemplary diagram for determining the time-domain position of ROs in repeated Msg1 transmissions associated with the same SSB, as provided in an embodiment of the present application. As shown in FIG. 3, assuming that multiple ROs are associated with SSB1, the correlation period between the first SSB and the ROs is determined according to a reference time point. In the first correlation period between the SSB and the ROs, the RO associated with SSB1 corresponds to the first Msg1 in the repeated Msg1 transmission. In the next correlation period between the SSB and the ROs, the RO associated with SSB1 corresponds to the second Msg1 in the repeated Msg1 transmission, and so on. That is, the time-domain positions of multiple ROs in repeated Msg1 transmissions correspond to the correlation periods between multiple consecutive SSBs and the ROs.

[0130] Optionally, determining a time domain location of an RO corresponding to each Msg1 transmission of the Msg1 repeated transmissions comprises: In a pattern of Msg1 repetitive transmission in which multiple ROs are associated with different SSBs, the time domain position of the RO associated with each SSB is within the correlation period between one SSB and the RO.

[0131] 4 is an exemplary diagram for determining the time domain positions of ROs for repeated Msg1 transmissions associated with different SSBs provided in an embodiment of the present application. As shown in FIG. 4, a terminal selects a combination of SSB1 and SSBi to perform repeated Msg1 transmission. The RO corresponding to the first Msg1 in the repeated Msg1 transmission is the RO associated with SSB1, and the RO corresponding to the second Msg1 in the repeated Msg1 transmission is the RO associated with SSBi. Here, the RO associated with SSB1 and the RO associated with SSBi are within the same correlation period between SSBs and ROs.

[0132] In step 401, the frequency domain location of the RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions is determined according to the frequency hopping parameters.

[0133] Based on the time domain location of the RO corresponding to each Msg1 transmission among the Msg1 repetitions, first determine the frequency domain location of the RO for the first Msg1 transmission among the Msg1 repetitions; then determine the frequency domain location of the RO for the second Msg1 transmission according to the frequency hopping parameters and the frequency domain location of the RO for the first Msg1 transmission; and determine the frequency domain location of the RO for the i-th Msg1 transmission according to the frequency hopping parameters and the frequency domain location of the RO for the (i-1)th Msg1 transmission. By analogy, the frequency domain locations of the ROs corresponding to each Msg1 transmission among the Msg1 repetitions are determined.

[0134] Optionally, the step of determining a frequency domain location of an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions according to the frequency hopping parameters includes: a frequency-domain location of an RO for a first Msg1 transmission among the repeated Msg1 transmissions is determined by a rule predefined in a protocol, or by one RO randomly selected from a set of ROs at the time-domain location of the first Msg1 transmission; determining a frequency domain position of an RO for an i-th Msg1 transmission among the Msg1 repetitions, based on the RO frequency domain position of the i-1-th Msg1 transmission among the Msg1 repetitions and an RO frequency hopping offset; Here, i is a positive integer equal to or greater than 2.

[0135] In one embodiment, a rule predefined in the protocol may be to determine the frequency domain location of the RO of the first Msg1 transmission according to the UE ID.

[0136] The RO frequency hopping ensures that the RO frequency hopping is performed among X available ROs associated with one SSB, as follows: indexRO(i-th transmission) = mod(indexRO(i-1-th transmission) + ROoffset, X), where indexRO indicates the index of multiple ROs that multiplex the frequency domain, and ROoffset is the offset of the RO frequency hopping, which is configured by the first configuration information or predefined in the protocol.

[0137] 5 is a schematic diagram 1 of RO frequency hopping provided in an embodiment of the present application. As shown in FIG. 5, RO offset=2.

[0138] Optionally, the step of determining frequency hopping parameters for Msg1 repetition transmission comprises: Determining the RO frequency hopping offset according to a configuration parameter of the correlation between the SSB and the RO or a rule predefined in a protocol.

[0139] In one embodiment, according to the SSB-to-RO correlation configuration parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB configured in the system message, one SSB is associated with X consecutive ROs, where X is an integer greater than 1, and the RO offset is a*X, where a is a real number greater than 0 and less than 1, e.g., a=1 / 2. If a*X is not an integer, the result is further rounded down or up to an integer. The value of a is predefined in the protocol.

[0140] In one embodiment, the rule predefined in the protocol is to determine the RO frequency hopping offset according to the RO frequency domain multiplexing number.

[0141] In particular, when RO offset=0, it means that the frequency resources of the ROs occupied by multiple Msg1s during repeated Msg1 transmission are the same, or that the logical positions among multiple consecutive ROs associated with the SSB are the same.

[0142] When the network side device configures the RO mask, the terminal needs to select an RO and an RO frequency hopping based on the RO offset from the valid RO set indicated by the RO mask.

[0143] In some embodiments, the ROs for the second repetition and the subsequent repetitions are independently located ROs.

[0144] It should be noted that the "second repetition" in the embodiments of this application refers to the second transmission of the same Msg1 before the end or start of the RAR window. (Optional definition) The Nth repetition is understood to be the Nth chronological transmission of Msg1 within one Msg1 repetition transmission.

[0145] In some alternative embodiments, the method comprises: The method further includes a step of the terminal determining that the network side device supports Msg1 repeated transmission when the first configuration information further includes ROs for the second and subsequent Msg1 transmissions among the Msg1 repeated transmissions. As can be understood, when a parameter for Msg1 repeated transmission is configured in the first configuration information, it means that the current cell supports / allows Msg1 repeated transmission.

[0146] As can be seen, after detecting the SSB and obtaining the system message, the terminal determines whether it is necessary to perform repeated Msg1 transmission, and if the first configuration information further includes ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions, the terminal determines that it is necessary to perform repeated Msg1 transmission.

[0147] Optionally, the pattern of the Msg1 repeat transmission is: A pattern in which the ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions and the RO for the first Msg1 transmission among the repeated Msg1 transmissions are associated with the same SSB; and a pattern in which the RO for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions and the RO for the first Msg1 transmission among the repeated Msg1 transmissions are associated with one or more different SSBs.

[0148] Furthermore, the first message indicates whether the pattern of repeated Msg1 transmission is a pattern in which the separately placed RO and the RO for transmitting the first Msg1 are associated with the same SSB, or a pattern in which the separately placed RO and the RO for transmitting the first Msg1 may be associated with one or more different SSBs.

[0149] Here, the RO for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions and the RO for the first Msg1 transmission among the repeated Msg1 transmissions are associated with one or more different SSBs, meaning that the SSB associated with the RO for the second and subsequent Msg1 transmissions and the SSB associated with the RO for the first Msg1 transmission are different, and there may be multiple different SSBs.

[0150] It should be noted that the separately arranged ROs are ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions.

[0151] Furthermore, optionally, one of the above patterns may be set as the default pattern by default according to a rule predefined in the protocol, and repeated Msg1 transmission may be performed using a pattern in which, for example, a separately placed RO and the RO for transmitting the first Msg1 are associated with the same or multiple SSBs.

[0152] Optionally, when the RO for the second and subsequent Msg1 transmissions among the Msg1 repeat transmissions and the RO for the first Msg1 transmission among the Msg1 repeat transmissions are associated with one or more different SSBs, the first message further carries a plurality of SSB combinations, which are associated with an Msg1 repeat transmission pattern in which the RO for the second and subsequent Msg1 transmissions among the current Msg1 repeat transmissions and the RO for the first Msg1 transmission among the Msg1 repeat transmissions are associated with one or more different SSBs.

[0153] Furthermore, when the terminal determines whether to select a PRACH resource that supports Msg1 repetition transmission, the terminal may make the determination based on one or more of the following: 1) A downlink metric (eg, RSRP, RSRQ, RSRI) is less than or equal to a first threshold T0. The first threshold may be an independently configured value, or may be an existing configured value or a function of an existing configured value, for example, it may also serve as the RSRP threshold for determining whether to perform a random access procedure for repeated transmission of Msg3. 2) Whether the number of times the PRACH preamble is repeatedly transmitted exceeds a third threshold. The third threshold may be an independently configured value, or may be an existing configured value or a function of an existing configured value, for example, half the maximum number of retransmissions for determining whether to request a random access error notification.

[0154] Furthermore, the terminal selects an SSB for the first Msg1 transmission according to a second threshold T1 of SSBs for RO resource selection for the first Msg1 transmission among the repeated Msg1 transmissions.

[0155] The second threshold may be independently configured, or may also serve as the threshold for selecting correlated SSBs during the random access procedure for repeated Msg3 transmission, or may also serve as the RSRP threshold for selecting SSBs when repeated Msg1 transmission is not performed (i.e., when Msg1 is transmitted once).

[0156] Furthermore, the terminal determines the RO and preamble sequence for the first Msg1 transmission according to the selected SSB, and can determine the locations and numbers of PRACH resources for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions according to the RO and preamble sequence of the first Msg1 transmission and the frequency hopping parameters.

[0157] Optionally, the method further comprises: The method further includes determining that the Msg1 repeated transmission supports frequency hopping when multiple ROs are arranged in the frequency domain.

[0158] The phrase "multiple ROs arranged in the frequency domain" used herein may refer to the arrangement of ROs in the frequency domain for the first Msg1 transmission.

[0159] In this case, if the RO configuration of the first Msg1 transmission supports multiplexing of multiple ROs in the frequency domain, it is considered that the Msg1 repeat transmission supports frequency hopping. Figure 6 is a schematic diagram 2 of RO frequency hopping provided in an embodiment of the present application, in which the number of repeat transmissions is 4 and the frequency hopping offset is 2. As shown in Figure 6, when two ROs used for the first Msg1 transmission are configured in the frequency domain, it is determined that the Msg1 repeat transmission supports frequency hopping.

[0160] Optionally, if frequency hopping is supported, the network side device indicates a frequency hopping offset, for example in units of RO.

[0161] Furthermore, the network side device can optionally set the step size of the RO frequency hopping, i.e., perform RO frequency hopping every few Msg1 transmissions. For example, the default step size can be optionally set to 1, i.e., perform one RO frequency hopping every time Msg1 is transmitted.

[0162] Optionally, the method further comprises: The method further includes determining the number of repeated Msg1 transmissions based on the number of ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions in the first configuration information.

[0163] Optionally, the method further comprises: The method further includes determining SSBs associated with the second and subsequent Msg1 transmissions of the repeated Msg1 transmissions according to an SSB pattern configured by a network side device or determined in advance.

[0164] In a pattern of repeated Msg1 transmission associated with multiple SSBs, the SSBs associated with the second and subsequent repetition transmissions can be determined by at least one of the following methods 1) to 2).

[0165] 1) SSB pattern configured by network side equipment.

[0166] For example, multiple SSBs of adjacent beams or the same beam may each be mapped to an RO for repeated transmission of Msg1.

[0167] 2) Pre-determined SSB patterns.

[0168] For example, if the first repetition is associated with SSB0, the UE and the network will associate the nth repetition with SSBx by default. x=(n-1)modN. Here, x is the index of the associated SSB, and N is the number of SSBs to actually transmit.

[0169] In an embodiment of the present application, the terminal determines a first time-frequency resource for Msg1 repetition transmission based on the first configuration information for Msg1 repetition transmission transmitted from the network side device, and selects ROs at different frequency positions to obtain frequency diversity gain and avoid complete overlap of time-frequency resources between resources used for different Msg1 repetitions, thereby improving the coverage performance of Msg1 repetition transmission and reducing the complexity of PRACH resource allocation.

[0170] Optionally, the step of receiving a first message from a network side device by the terminal, the first message carrying first configuration information for repeated transmission of Msg1, includes: The method includes a step of receiving, by the terminal, a first message carrying first configuration information for instructing the terminal to perform repeated transmission of Msg1 in a contention-free random access procedure.

[0171] In this embodiment, the first message carries first configuration information for instructing repeated transmission of Msg1 in the contention-free random access procedure.

[0172] Optionally, the first configuration information includes at least one of the following a) to f):

[0173] a) Random access type.

[0174] Selectable random access type: A four-step random access procedure consisting of one Msg1 transmission and one Msg3 transmission. A four-step random access procedure with single transmission of Msg1 and repeated transmission of Msg3. A four-step random access procedure with repeated transmission of Msg1 and one transmission of Msg3. It includes at least one of the four-step random access procedures of repeated Msg1 transmission and repeated Msg3 transmission.

[0175] Specifically, the A-bits field is defined and indicated, and A may be 2. Alternatively, the RACH type is determined according to the correspondence relationship of the preamble index in the range of preamble indexes of different RACH types indicated by the DCI.

[0176] The random access type can determine whether or not to perform repeated transmission of Msg1.

[0177] b) Msg1 repeat transmission pattern.

[0178] Selectable Msg1 repeat transmission pattern: It includes Msg1 repeat transmission patterns associated with the same SSB or Msg1 repeat transmission patterns associated with multiple SSBs.

[0179] c) Number of times Msg1 is repeated.

[0180] d) Whether to enable RO frequency hopping.

[0181] Whether to enable RO frequency hopping indicates whether the Msg1 repeated transmission supports frequency hopping, or determines whether to enable RO frequency hopping by default through the configuration of the system message.

[0182] e) RO frequency hopping offset.

[0183] Optionally, the first configuration information indicates an RO frequency hopping offset (RO offset) for the Msg1 repeated transmission.

[0184] Alternatively, the RO offset is determined according to a rule predefined in the protocol or the placement of a system message.

[0185] f) RO set.

[0186] Optionally, the field indicates an RO configuration set, such as an RO set on the NUL carrier, or a 2-step RO set, or an RO set for 4-step RACH with Msg3 repetition, or an RO set for specially configured Msg1 repetition transmission.

[0187] Optionally, the first configuration message may further include an RO for the second and subsequent Msg1 transmissions of the Msg1 repeat transmission.

[0188] The terminal determines a first time-frequency resource for repeated transmission of Msg1 based on the first configuration information.

[0189] Optionally, the step of determining, by the terminal, a first time-frequency resource for repeated transmission of Msg1 based on the first configuration information includes: determining whether to perform repeated transmission of Msg1; determining a Physical Random Access Channel (PRACH) resource for Msg1 repetition transmission; determining frequency hopping parameters for Msg1 repetition transmission; determining an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions.

[0190] In this embodiment, for the step in which the terminal determines the first time-frequency resource for repeated transmission of Msg1 based on the first configuration information, reference may be made to the relevant flow of the step in the above embodiment in which the terminal determines the first time-frequency resource for repeated transmission of Msg1 based on the first configuration information, and detailed description thereof will be omitted here.

[0191] When the first configuration message may further include ROs for the second and subsequent Msg1 transmissions of the Msg1 repeated transmissions, the method further comprises: determining the number of times of repeating Msg1 transmissions according to the number of ROs and / or a frequency hopping pattern for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions in the first configuration information; and determining that the Msg1 repeated transmission supports frequency hopping when multiple ROs are arranged in the frequency domain.

[0192] In the Msg1 repeat transmission scheduled by DCI, fields in DCI 1-0 are used to indicate the configuration information of the Msg1 repeat transmission, including the random access type, the Msg1 repeat transmission pattern, the number of Msg1 repeat transmissions, whether to enable RO frequency hopping, and the related parameters of RO frequency hopping.

[0193] In an embodiment of the present application, a terminal receives first configuration information sent from a network side device, instructing the terminal to perform repeated transmission of Msg1 in the contention-free random access procedure, and determines a first time-frequency resource for repeated transmission of Msg1 in the contention-free random access procedure based on the first configuration information, thereby realizing repeated transmission of Msg1 in the contention-free random access procedure and improving the coverage performance of the PRACH.

[0194] FIG. 7 is a flowchart 2 of a method for determining time-frequency resources for Msg1 repeated transmission provided in an embodiment of the present application. As shown in FIG. 7, the method is applied to a network side device: The method includes step 700 in which the network side device sends a first message carrying first configuration information for repeated transmission of Msg1 to the terminal.

[0195] As can be seen, the network side device sends the first message to the terminal to indicate the first configuration information of the Msg1 repeated transmission to the terminal.

[0196] Optionally, the first message includes at least one of a system message, a DCI, a MAC CE, and an RRC signaling.

[0197] Optionally, the first configuration information includes at least one of the following 1) and 11):

[0198] 1) Msg1 repeat transmission pattern.

[0199] Optionally, the pattern of the Msg1 repeat transmission is: Multiple ROs are associated with the same SSB, or It includes patterns where multiple ROs are associated with different SSBs.

[0200] Here, the pattern in which multiple ROs are associated with different SSBs refers to a pattern in which multiple ROs are associated with multiple SSBs.

[0201] Optionally, one of the above patterns may be set as the default pattern by default according to a rule predefined in the protocol, for example, a pattern in which multiple ROs are associated with the same SSB by default to perform Msg1 repetition transmission.

[0202] 2) Multiple SSB combinations.

[0203] It should be noted that multiple ROs may be associated with different SSBs, and different SSBs may correspond to multiple SSB combinations, and thus the first configuration information further includes multiple SSB combinations used in the Msg1 repeat transmission pattern associated with multiple SSBs. In one possible indication implementation, the first configuration information indicates all SSB combinations at once in the form of a bit map or index sequence, or determines other SSB combinations based on the first SSB combination, for example, the index of the second SSB combination is the sum of the index of the first SSB combination and a specific offset.

[0204] In a practical deployment, multiple SSBs may use the same transmission beam, and the base station instructs multiple SSBs in the same beam to transmit Msg1 repeatedly.

[0205] 3) The configuration parameters of the correlation between SSB and RO.

[0206] As can be seen, the SSB to RO correlation configuration parameter is used to indicate the correlation between the SSB and RO.

[0207] The correlation between an SSB and an RO includes the correlation between one SSB and multiple ROs or the correlation between one RO and multiple SSBs.

[0208] For example, the SSB-to-RO correlation configuration parameter ssb-perRACH-OccasionAndCB-PreamblesPerSSB indicates that one SSB is associated with X consecutive ROs, where X is an integer greater than 1.

[0209] In an embodiment of the present application, optionally, when the RO frequency hopping offset is not explicitly configured in the first message, the RO frequency hopping offset can be determined by the configuration parameters of the correlation between the SSB and the RO.

[0210] 4) A first threshold value for indicating the trigger threshold for Msg1 repeated transmission.

[0211] In one embodiment, the terminal determines whether to perform repeated Msg1 transmission according to a trigger threshold for repeated Msg1 transmission.

[0212] The first threshold may be a trigger threshold for independently arranged Msg1 repeated transmission, or may also serve as a threshold for determining whether or not to execute a random access procedure for Msg3 repeated transmission.

[0213] Here, the threshold value for determining whether or not to execute the random access procedure for repeated Msg3 transmission is the trigger threshold value for the random access procedure for repeated Msg3 transmission.

[0214] 5) A second threshold for indicating the selection threshold of the correlation SSB for Msg1 repeated transmission.

[0215] In one embodiment, the terminal selects the correlated SSBs of the Msg1 repeated transmission according to a selection threshold of the correlated SSBs of the Msg1 repeated transmission.

[0216] The correlated SSB of a repeated Msg1 transmission is the SSB that is associated with the repeated Msg1 transmission.

[0217] The second threshold may be an independently arranged threshold for selecting correlated SSBs for repeated Msg1 transmission, or may also serve as a threshold for selecting correlated SSBs during the random access procedure for repeated Msg3 transmission.

[0218] Here, the threshold for selecting the correlated SSB in the random access procedure of Msg3 repeated transmission is the correlation SSB selection threshold of the random access procedure of Msg3 repeated transmission.

[0219] 6) Whether to enable RO frequency hopping.

[0220] It can be understood that when the network side device instructs to enable RO frequency hopping, it means that it supports frequency hopping in the frequency domain of the RO resource for Msg1 repetitive transmission.

[0221] If the network side device instructs not to enable RO frequency hopping, it means that it does not support frequency hopping in the frequency domain of the RO resource for Msg1 repetitive transmission.

[0222] 7) RO frequency hopping offset.

[0223] Optionally, when RO frequency hopping is enabled, the network side device further indicates an RO frequency hopping offset, RO offset.

[0224] The RO frequency hopping offset is in units of RO.

[0225] 8) Number of frequency hops or frequency hopping step size.

[0226] Optionally, the network side device configures the step size of the RO frequency hopping.

[0227] For example, RO frequency hopping is performed every n Msg1 transmissions, where n is the compensation for RO frequency hopping.

[0228] Optionally, when the RO frequency hopping step size is not explicitly configured, the step size defaults to 1, i.e., one RO frequency hop is performed each time Msg1 is sent.

[0229] 9) Number of times Msg1 is repeated.

[0230] It should be noted that the number of times to repeat transmission of Msg1 may be indicated by the first configuration information or may be determined by a value predefined in the protocol. Optionally, a set of repeat transmission times including multiple selectable values ​​is configured in the first configuration information, and the terminal selects the actual number of times to repeat transmission of Msg1 according to the channel quality.

[0231] 10) Msg1 repeat transmission preamble resource set.

[0232] 11) RO mask for Msg1 repeated transmission.

[0233] Optionally, the first configuration information may further include an RO mask for Msg1 repetition transmission.

[0234] It should be noted that when the network side device configures the RO mask, the terminal needs to select an RO frequency hopping according to the RO and RO offset from the valid RO set indicated by the RO mask. Furthermore, optionally, the first configuration information includes multiple RO masks, each corresponding to a different number of repeated transmissions of Msg1.

[0235] Optionally, the method further comprises: The method further includes sending, to the terminal, first signaling used to instruct the terminal to perform Msg1 repeated transmission, the first signaling carrying instruction information related to RO frequency hopping.

[0236] As can be seen, the network side device may explicitly instruct the terminal to perform repeated transmission of Msg1.

[0237] Here, the indication information related to RO frequency hopping includes at least one of whether to enable RO frequency hopping, RO frequency hopping offset, frequency hopping number, or frequency hopping step size.

[0238] Optionally, the first signaling includes DCI or MAC CE or RRC signaling.

[0239] Optionally, the first configuration information further includes ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions.

[0240] As can be seen, the network side device can independently configure the ROs for the second Msg1 transmission and the subsequent Msg1 transmissions by transmitting the first configuration information containing the ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions.

[0241] After detecting the SSB and obtaining the system message, the terminal determines whether it is necessary to perform repeated Msg1 transmission. If the first configuration information further includes ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions, the terminal determines that it is necessary to perform repeated Msg1 transmission.

[0242] Optionally, the method further comprises: The method further includes transmitting to the terminal an SSB pattern for the terminal to determine SSBs associated with the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions.

[0243] As will be appreciated, the network side equipment transmits the SSB pattern to the terminal so that the terminal determines the SSBs associated with the second and subsequent Msg1 transmissions of said Msg1 repeat transmissions.

[0244] The SSB pattern is used to associate the Msg1 transmission with the SSB.

[0245] For example, multiple SSBs in adjacent beams or the same beam may each be mapped to different ROs for repeated Msg1 transmission.

[0246] Furthermore, for example, if the first repetition is associated with SSB0, the UE and the network will associate the nth repetition with SSBx by default. x=(n-1)modN. Here, x is the index of the associated SSB, and N is the number of SSBs to actually transmit.

[0247] In an embodiment of the present application, the network side device sends first configuration information for Msg1 repeated transmission to the terminal, so that the terminal determines the first time-frequency resource for Msg1 repeated transmission, thereby realizing Msg1 repeated transmission and improving the coverage performance of the PRACH.

[0248] Optionally, the step of the network side device sending a first message carrying first configuration information of Msg1 repeated transmission to the terminal includes: The method includes a step in which a network side device transmits, to a terminal, a first message carrying first configuration information for instructing the terminal to perform repeated transmission of Msg1 in a contention-free random access procedure.

[0249] As can be seen, the network side device sends a first message to the terminal to transmit first configuration information to the terminal, instructing the terminal to perform Msg1 repeated transmission in the contention-free random access procedure, so that the terminal determines a first time-frequency resource for Msg1 repeated transmission based on the first configuration information.

[0250] Optionally, the first configuration information includes at least one of the following a) to f):

[0251] a) Random access type.

[0252] Optionally, the random access type is: A four-step random access procedure consisting of one Msg1 transmission and one Msg3 transmission. A four-step random access procedure with single transmission of Msg1 and repeated transmission of Msg3. A four-step random access procedure with repeated transmission of Msg1 and one transmission of Msg3. It includes at least one of the four-step random access procedures of repeated Msg1 transmission and repeated Msg3 transmission.

[0253] Specifically, the A-bits field is defined and indicated, and A may be 2. Alternatively, the RACH type is determined according to the correspondence relationship of the preamble index in the range of preamble indexes of different RACH types indicated by the DCI.

[0254] The random access type can determine whether or not to perform repeated transmission of Msg1.

[0255] b) Msg1 repeat transmission pattern.

[0256] Selectable Msg1 repeat transmission pattern: It includes Msg1 repeat transmission patterns associated with the same SSB or Msg1 repeat transmission patterns associated with multiple SSBs.

[0257] c) Number of times Msg1 is repeated.

[0258] d) Whether to enable RO frequency hopping.

[0259] Whether to enable RO frequency hopping indicates whether Msg1 repeated transmission supports frequency hopping, or determines whether to enable RO frequency hopping by default according to the configuration of the system message.

[0260] e) RO frequency hopping offset.

[0261] Optionally, the first configuration information indicates an RO frequency hopping offset (RO offset) for the Msg1 repeated transmission.

[0262] Alternatively, the RO offset is determined according to a rule predefined in the protocol or the placement of a system message.

[0263] f) RO set.

[0264] Optionally, the field indicates an RO configuration set, such as an RO set on the NUL carrier, or a 2-step RO set, or an RO set for 4-step RACH with Msg3 repetition, or an RO set for specially configured Msg1 repetition transmission.

[0265] Optionally, the first configuration message may further include an RO for the second and subsequent Msg1 transmissions of the Msg1 repeat transmission.

[0266] The network side device can independently configure the ROs for the second repetition and the subsequent repetitions of Msg1 by transmitting the first configuration information containing the ROs for the second and subsequent repetitions of Msg1.

[0267] In an embodiment of the present application, the network side device sends first configuration information to the terminal to instruct the terminal to perform Msg1 repeat transmission in the contention-free random access procedure, so that the terminal determines a first time-frequency resource for Msg1 repeat transmission in the contention-free random access procedure, thereby realizing Msg1 repeat transmission in the contention-free random access procedure and improving the coverage performance of the PRACH.

[0268] The method for determining time-frequency resources for repeated Msg1 transmission provided in the embodiments of the present application may be performed by a device for determining time-frequency resources for repeated Msg1 transmission. The device for determining time-frequency resources for repeated Msg1 transmission provided in the embodiments of the present application will be described by taking the device for determining time-frequency resources for repeated Msg1 transmission in the embodiments of the present application as an example that executes the method for determining time-frequency resources for repeated Msg1 transmission.

[0269] FIG. 8 is a schematic diagram 1 of the configuration of a device 800 for determining time-frequency resources for repeated Msg1 transmission provided in an embodiment of the present application. As shown in FIG. 8, the device 800 for determining time-frequency resources for repeated Msg1 transmission includes: a first receiving unit 810 used to receive a first message carrying first arrangement information for Msg1 repeated transmission, the first message being sent from a network side device; a first determining unit 820 used to determine a first time-frequency resource for repeated transmission of Msg1 based on the first configuration information; The step of determining a first time-frequency resource for repeated transmission of Msg1 includes: determining whether to perform repeated transmission of Msg1; determining a Physical Random Access Channel (PRACH) resource for Msg1 repetition transmission; and determining frequency hopping parameters for Msg1 repeated transmission.

[0270] Optionally, the first configuration information comprises: Msg1 repeat transmission pattern, Multiple SSB combinations, Configuration parameters for SSB and RO correlation, a first threshold for indicating the trigger threshold for Msg1 repeated transmission; a second threshold for indicating the selection threshold of the correlation SSB for the Msg1 repetition transmission; Whether to enable RO frequency hopping, RO frequency hopping offset, the number of frequency hops or the frequency hopping step size, Msg1 repeat transmission count, Msg1: Preamble resource set for repeated transmission; Msg1 contains at least one of the RO masks for repeated transmission.

[0271] Optionally, the pattern of the Msg1 repeat transmission is: A pattern in which multiple ROs are associated with the same SSB, or It includes patterns where multiple ROs are associated with different SSBs.

[0272] Optionally, the step of determining whether to perform Msg1 repeated transmission and determining a Physical Random Access Channel (PRACH) resource for Msg1 repeated transmission comprises: determining to perform repeated Msg1 transmission when a first condition is satisfied, and determining a PRACH resource for the repeated Msg1 transmission; The first condition is the four-step random access fails N times, the value of N being predefined in the protocol or configured by the first message; Msg1: Having received first signaling, which is used to instruct the terminal to perform repeated transmission and carries instruction information related to RO frequency hopping; the signal quality of the downlink signal is equal to or lower than the first threshold; The first threshold value may be set by the first message, or may also be used as a threshold value for determining whether or not to execute a random access procedure for repeated transmission of Msg3.

[0273] Optionally, the failure of the four-step random access N times In one four-step random access procedure, the terminal attempts to send Msg1 once N times but does not receive the corresponding Msg2, or In one four-step random access procedure, the terminal sends Msg1 once and receives the corresponding Msg2 N times, but fails to transmit Msg3; The value of N may be predefined in a protocol or may be configured by the first message.

[0274] Optionally, the first signaling includes DCI or MAC CE or RRC signaling.

[0275] Optionally, the step of determining PRACH resources for repeated Msg1 transmission comprises: determining an SSB or a combination of SSBs associated with the Msg1 repeated transmission according to the pattern of the Msg1 repeated transmission and a second threshold; determining a set of candidate ROs of PRACH resources for the Msg1 repeated transmission according to a correlation between ROs and SSBs or SSB combinations associated with the Msg1 repeated transmission; determining an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions; The second threshold value may be set by the first message, or may also be used as the threshold value for selecting correlated SSBs during the random access procedure of Msg3 repeated transmission.

[0276] Optionally, the step of determining an SSB associated with the Msg1 repeated transmission according to the pattern of the Msg1 repeated transmission and the second threshold value includes: In a pattern of Msg1 repeated transmission in which multiple ROs are associated with the same SSB, a terminal compares the signal qualities of all detected SSBs with the second threshold and selects an SSB whose signal quality is higher than the second threshold as an SSB associated with the Msg1 repeated transmission; Alternatively, when there are a plurality of SSBs whose signal quality is higher than the second threshold, selecting one SSB from the plurality of SSBs by the terminal or randomly as an SSB related to the Msg1 repeated transmission; Alternatively, if there is no SSB whose signal quality is higher than the second threshold, the method includes a step of selecting, by the terminal or randomly, one SSB as the SSB associated with the Msg1 repeated transmission.

[0277] Optionally, the step of determining an SSB combination associated with the Msg1 repeated transmission according to the pattern of the Msg1 repeated transmission and the second threshold value includes: In a pattern of Msg1 repeated transmission in which multiple ROs are associated with different SSBs, the method includes a step of comparing the signal quality of SSB combinations with the second threshold and selecting one SSB combination from the SSB combinations as the SSB combination associated with the Msg1 repeated transmission.

[0278] Optionally, the step of determining an RO corresponding to each Msg1 transmission of the Msg1 repeated transmissions comprises: determining a time-domain location of the RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions; and determining a frequency domain location of an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions according to the frequency hopping parameters.

[0279] Optionally, determining a time domain location of an RO corresponding to each Msg1 transmission of the Msg1 repeated transmissions comprises: In a pattern of Msg1 repetitive transmission in which multiple ROs are associated with the same SSB, the time domain positions of the multiple ROs in the Msg1 repetitive transmission correspond to correlation periods between multiple consecutive SSBs and the RO; The correlation period corresponding to the first Msg1 of the repeated Msg1 transmission is determined by a reference time point, which is predefined by a protocol or determined by configuration in the first message.

[0280] Optionally, determining a time domain location of an RO corresponding to each Msg1 transmission of the Msg1 repeated transmissions comprises: In a pattern of Msg1 repetitive transmission in which multiple ROs are associated with different SSBs, the time domain position of the RO associated with each SSB is within the correlation period between one SSB and the RO.

[0281] Optionally, the step of determining a frequency domain location of an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions according to the frequency hopping parameters includes: a frequency-domain location of an RO for a first Msg1 transmission among the repeated Msg1 transmissions is determined by a rule predefined in a protocol, or by one RO randomly selected from a set of ROs at the time-domain location of the first Msg1 transmission; determining a frequency domain position of an RO for an i-th Msg1 transmission among the Msg1 repetitions, based on the RO frequency domain position of the i-1-th Msg1 transmission among the Msg1 repetitions and an RO frequency hopping offset; i is a positive integer greater than or equal to 2.

[0282] Optionally, the step of determining frequency hopping parameters for Msg1 repetition transmission comprises: Determining the RO frequency hopping offset according to a configuration parameter of the correlation between the SSB and the RO or a rule predefined in a protocol.

[0283] Optionally, the device comprises: The network side device further includes a second determination unit that is used to determine that the network side device supports repeated Msg1 transmission when the first configuration information further includes an RO for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions.

[0284] Optionally, the pattern of the Msg1 repeat transmission is: A pattern in which the ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions and the RO for the first Msg1 transmission among the repeated Msg1 transmissions are associated with the same SSB; and a pattern in which the RO for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions and the RO for the first Msg1 transmission among the repeated Msg1 transmissions are associated with one or more different SSBs.

[0285] Optionally, the first message further carries a plurality of SSB combinations, where the RO for the second and subsequent Msg1 transmissions of the Msg1 repeat transmissions and the RO for the first Msg1 transmission of the Msg1 repeat transmissions are associated with one or more different SSBs.

[0286] Optionally, the device comprises: The method further includes a third determining unit, which is used to determine that the Msg1 repeated transmission supports frequency hopping when multiple ROs are arranged in the frequency domain.

[0287] Optionally, the device comprises: The wireless communication device further includes a fourth determination unit used to determine the number of repeated Msg1 transmissions according to the number of ROs for the second and subsequent repeated Msg1 transmissions in the first configuration information.

[0288] Optionally, the device comprises: The device further includes a fifth determination unit configured by a network side device or used to determine SSBs associated with the second and subsequent Msg1 transmissions of the Msg1 repeated transmissions according to a predetermined SSB pattern.

[0289] Optionally, the first receiving unit: It is used to receive a first message carrying first configuration information for instructing to perform repeated transmission of Msg1 in the contention-free random access procedure.

[0290] Optionally, the first configuration information comprises: Random access type, Msg1 repeat transmission pattern, Msg1 repeat transmission count, Whether to enable RO frequency hopping, RO frequency hopping offset, Contains at least one of the RO sets.

[0291] Optionally, the random access type is: A four-step random access procedure consisting of one Msg1 transmission and one Msg3 transmission. A four-step random access procedure with single transmission of Msg1 and repeated transmission of Msg3. A four-step random access procedure with repeated transmission of Msg1 and one transmission of Msg3. It includes at least one of the four-step random access procedures of repeated Msg1 transmission and repeated Msg3 transmission.

[0292] Optionally, the first message includes at least one of a system message, a DCI, a MAC CE, and an RRC signaling.

[0293] In the embodiments of the present application, the device for determining the time-frequency resource of Msg1 repeated transmission may be an electronic device such as an electronic device with an operating system, or an element in an electronic device such as an integrated circuit or chip. The electronic device may be a terminal or other device other than a terminal. For example, the terminal may include, but is not limited to, the types of terminal 11 listed above, and other devices may be, for example, a server, a network-attached storage (NAS), etc., and are not specifically limited in the embodiments of the present application.

[0294] The device for determining the time-frequency resource of Msg1 repeated transmission provided in the embodiment of the present application realizes each step realized in the method embodiment of Figures 2 to 6, and can achieve the same technical effects, so detailed description will be omitted here to avoid repetition.

[0295] 9 is a schematic diagram 2 of the configuration of the device 900 for determining time-frequency resources for repeated Msg1 transmission provided in the embodiment of the present application. As shown in FIG. 9, the device 900 for determining time-frequency resources for repeated Msg1 transmission includes: The first transmitting unit 910 is used to transmit a first message carrying first configuration information of Msg1 repeated transmission to a terminal.

[0296] Optionally, the first configuration information comprises: Msg1 repeat transmission pattern, Multiple SSB combinations, Configuration parameters for SSB and RO correlation, a first threshold for indicating the trigger threshold for Msg1 repeated transmission; a second threshold for indicating the selection threshold of the correlation SSB for the Msg1 repetition transmission; Whether to enable RO frequency hopping, RO frequency hopping offset, the number of frequency hops or the frequency hopping step size, Msg1 repeat transmission count, Msg1: Preamble resource set for repeated transmission; Msg1 contains at least one of the RO masks for repeated transmission.

[0297] Optionally, the device comprises: The radio communication device further includes a second transmitting unit, which is used to instruct the terminal to perform Msg1 repeated transmission and is used to transmit first signaling to the terminal, the first signaling carrying instruction information related to RO frequency hopping.

[0298] Optionally, the first signaling includes DCI or MAC CE or RRC signaling.

[0299] Optionally, the first configuration information further includes ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions.

[0300] Optionally, the device comprises: The mobile station further includes a third transmission unit used to transmit to the terminal an SSB pattern for the terminal to determine SSBs associated with the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions.

[0301] Optionally, the first transmitting unit: It is used to send a first message to a terminal, which carries first configuration information for instructing the terminal to perform repeated transmission of Msg1 in the contention-free random access procedure.

[0302] Optionally, the first configuration information comprises: Random access type, Msg1 repeat transmission pattern, Msg1 repeat transmission count, Whether to enable RO frequency hopping, RO frequency hopping offset, Contains at least one of the RO sets.

[0303] Optionally, the random access type is: A four-step random access procedure consisting of one Msg1 transmission and one Msg3 transmission. A four-step random access procedure with single transmission of Msg1 and repeated transmission of Msg3. A four-step random access procedure with repeated transmission of Msg1 and one transmission of Msg3. It includes at least one of the four-step random access procedures of repeated Msg1 transmission and repeated Msg3 transmission.

[0304] Optionally, the first message includes at least one of a system message, a DCI, a MAC CE, and an RRC signaling.

[0305] The device for determining the time-frequency resource of Msg1 repeated transmission provided in the embodiment of the present application can implement each step implemented in the method embodiment of Figure 7 and achieve the same technical effect, and detailed description will be omitted here to avoid repetition.

[0306] Optionally, as shown in Fig. 10, an embodiment of the present application further provides a communication device 1000, including a processor 1001 and a memory 1002, wherein the memory 1002 stores a program or command executable by the processor 1001. For example, when the communication device 1000 is a terminal, the program or command is executed by the processor 1001 to implement each step of the embodiment of the method for determining time-frequency resource for Msg1 repeated transmission, thereby achieving the same technical effect. When the communication device 1000 is a network-side device, the program or command is executed by the processor 1001 to implement each step of the embodiment of the method for determining time-frequency resource for Msg1 repeated transmission, thereby achieving the same technical effect. To avoid repetition, detailed description thereof will be omitted here.

[0307] An embodiment of the present application further provides a terminal including: a communication interface that receives a first message, transmitted from a network side device, carrying first configuration information for Msg1 repeated transmission; and a processor that determines a first time-frequency resource for the Msg1 repeated transmission based on the first configuration information, wherein the step of determining the first time-frequency resource for the Msg1 repeated transmission includes at least one of the following steps: determining whether to perform Msg1 repeated transmission; determining a Physical Random Access Channel (PRACH) resource for the Msg1 repeated transmission; determining a frequency hopping parameter for the Msg1 repeated transmission; and determining an RO corresponding to each Msg1 transmission among the Msg1 repeated transmissions.

[0308] This terminal embodiment corresponds to the above terminal-side method embodiment, and all the implementation steps and realization forms of the above method embodiments can be applied to this terminal embodiment, and the same technical effects can be achieved.

[0309] Specifically, FIG. 11 is a schematic diagram of the hardware configuration of a terminal that realizes an embodiment of the present application.

[0310] The terminal 1100 includes at least some components such as, but not limited to, a radio frequency unit 1101, a network module 1102, an audio output unit 1103, an input unit 1104, a sensor 1105, a display unit 1106, a user input unit 1107, an interface unit 1108, a memory 1109 and a processor 1110.

[0311] It will be understood by those skilled in the art that the terminal 1100 may further include a power source (e.g., a battery) for powering each element, and the power source may be logically connected to the processor 1110 through a power management system, which may further realize functions such as charge / discharge management and power consumption management. The configuration of the terminal shown in Figure 11 is not intended to limit the terminal, and the terminal may include more or fewer elements than those shown in the drawing, or may combine some elements, or may have a different element arrangement, and detailed description thereof will be omitted here.

[0312] It should be understood that in an embodiment of the present application, the input unit 1104 may include a graphics processing unit (GPU) 11041 for processing image data of static or video images acquired by an image acquisition device (e.g., a camera) in a video acquisition mode or an image acquisition mode, and a microphone 11042. The display unit 1106 may include a display panel 11061, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like. The user input unit 1107 includes at least one of a touch panel 11071 and other input devices 11072. The touch panel 11071 is also called a touch screen. The touch panel 11071 may include two parts: a touch detection device and a touch controller. The other input devices 11072 may include, but are not limited to, a physical keyboard, function buttons (e.g., volume control buttons, switch buttons, etc.), a trackball, a mouse, and a control lever, and detailed descriptions thereof will be omitted here.

[0313] In the embodiment of the present application, the radio frequency unit 1101 can receive downlink data from the network side device and then transmit the data to the processor 1110 for processing, and can also transmit uplink data to the network side device. Typically, the radio frequency unit 1101 includes, but is not limited to, an antenna, an amplifier, a receiver / transmitter, a coupler, a low-noise amplifier, a duplexer, etc.

[0314] The memory 1109 can be used to store software programs, commands, and various data. The memory 1109 may mainly include a first storage area and a second storage area for storing programs and commands. The first storage area can store an operating system, applications, and commands required for at least one function (e.g., audio playback, image playback, etc.). The memory 1109 may include volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory may be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synch link dynamic random access memory (SLDRAM), and direct Rambus random access memory (DRRAM). Memory 1009 in embodiments of the present application includes, but is not limited to, these and any other suitable types of memory.

[0315] The processor 1110 may include one or more processing units, and optionally integrates an application processor that mainly processes operations related to an operating system, a user interface, applications, etc., and a modem processor that mainly processes wireless communication signals, e.g., a baseband processor, in the processor 1110. It is understood that the modem processor need not be integrated into the processor 1110.

[0316] The high frequency unit 1101 is used to receive a first message transmitted from a network side device, the first message including first arrangement information for Msg1 repeated transmission; The processor 1110 is used to determine a first time-frequency resource for repeated transmission of Msg1 based on the first configuration information, and the step of determining the first time-frequency resource for repeated transmission of Msg1 includes at least one of the steps of determining whether to perform repeated transmission of Msg1, determining a physical random access channel (PRACH) resource for repeated transmission of Msg1, and determining a frequency hopping parameter for repeated transmission of Msg1.

[0317] In an embodiment of the present application, the terminal determines a first time-frequency resource for Msg1 repeated transmission based on first configuration information for Msg1 repeated transmission transmitted from a network side device, thereby realizing Msg1 repeated transmission and improving the coverage performance of the PRACH.

[0318] Optionally, the first configuration information comprises: Msg1 repeat transmission pattern, Multiple SSB combinations, Configuration parameters for SSB and RO correlation, a first threshold for indicating the trigger threshold for Msg1 repeated transmission; a second threshold for indicating the selection threshold of the correlation SSB for the Msg1 repetition transmission; Whether to enable RO frequency hopping, RO frequency hopping offset, the number of frequency hops or the frequency hopping step size, Msg1 repeat transmission count, Msg1: Preamble resource set for repeated transmission; Msg1 contains at least one of the RO masks for repeated transmission.

[0319] Optionally, the pattern of the Msg1 repeat transmission is: A pattern in which multiple ROs are associated with the same SSB, or It includes patterns where multiple ROs are associated with different SSBs.

[0320] Optionally, the processor 1110: When a first condition is satisfied, determining to perform repeated Msg1 transmission and determining a PRACH resource for the repeated Msg1 transmission; The first condition is the four-step random access fails N times, the value of N being predefined in the protocol or configured by the first message; Msg1: Having received first signaling, which is used to instruct the terminal to perform repeated transmission and carries instruction information related to RO frequency hopping; the signal quality of the downlink signal is equal to or lower than the first threshold; The first threshold value may be set by the first message, or may also be used as a threshold value for determining whether or not to execute a random access procedure for repeated transmission of Msg3.

[0321] Optionally, the failure of the four-step random access N times In one four-step random access procedure, the terminal attempts to send Msg1 once N times but does not receive the corresponding Msg2, or In one four-step random access procedure, the terminal sends Msg1 once and receives the corresponding Msg2 N times, but fails to transmit Msg3; The value of N may be predefined in a protocol or may be configured by the first message.

[0322] Optionally, the first signaling includes DCI or MAC CE or RRC signaling.

[0323] Optionally, the step of determining PRACH resources for repeated Msg1 transmission comprises: determining an SSB or a combination of SSBs associated with the Msg1 repeated transmission according to the pattern of the Msg1 repeated transmission and a second threshold; determining a set of candidate ROs of PRACH resources for the Msg1 repeated transmission according to a correlation between ROs and SSBs or SSB combinations associated with the Msg1 repeated transmission; determining an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions; The second threshold value may be set by the first message, or may also be used as the threshold value for selecting correlated SSBs during the random access procedure of Msg3 repeated transmission.

[0324] Optionally, the step of determining an SSB associated with the Msg1 repeated transmission according to the pattern of the Msg1 repeated transmission and the second threshold value includes: In a pattern of Msg1 repeated transmission in which multiple ROs are associated with the same SSB, a terminal compares the signal qualities of all detected SSBs with the second threshold and selects an SSB whose signal quality is higher than the second threshold as an SSB associated with the Msg1 repeated transmission; Alternatively, when there are a plurality of SSBs whose signal quality is higher than the second threshold, selecting one SSB from the plurality of SSBs by the terminal or randomly as an SSB related to the Msg1 repeated transmission; Alternatively, if there is no SSB whose signal quality is higher than the second threshold, the method includes a step of selecting, by the terminal or randomly, one SSB as the SSB associated with the Msg1 repeated transmission.

[0325] Optionally, the step of determining an SSB combination associated with the Msg1 repeated transmission according to the pattern of the Msg1 repeated transmission and the second threshold value includes: In a pattern of Msg1 repeated transmission in which multiple ROs are associated with different SSBs, the method includes a step of comparing the signal quality of SSB combinations with the second threshold and selecting one SSB combination from the SSB combinations as the SSB combination associated with the Msg1 repeated transmission.

[0326] Optionally, the step of determining an RO corresponding to each Msg1 transmission of the Msg1 repeated transmissions comprises: determining a time-domain location of the RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions; and determining a frequency domain location of an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions according to the frequency hopping parameters.

[0327] Optionally, determining a time domain location of an RO corresponding to each Msg1 transmission of the Msg1 repeated transmissions comprises: In a pattern of Msg1 repetitive transmission in which multiple ROs are associated with the same SSB, the time domain positions of the multiple ROs in the Msg1 repetitive transmission correspond to correlation periods between multiple consecutive SSBs and the RO; The correlation period corresponding to the first Msg1 of the repeated Msg1 transmission is determined by a reference time point, which is predefined by a protocol or determined by configuration in the first message.

[0328] Optionally, determining a time domain location of an RO corresponding to each Msg1 transmission of the Msg1 repeated transmissions comprises: In a pattern of Msg1 repetitive transmission in which multiple ROs are associated with different SSBs, the time domain position of the RO associated with each SSB is within the correlation period between one SSB and the RO.

[0329] Optionally, the step of determining a frequency domain location of an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions according to the frequency hopping parameters includes: a frequency-domain location of an RO for a first Msg1 transmission among the repeated Msg1 transmissions is determined by a rule predefined in a protocol, or by one RO randomly selected from a set of ROs at the time-domain location of the first Msg1 transmission; determining a frequency domain position of an RO for an i-th Msg1 transmission among the Msg1 repetitions, based on the RO frequency domain position of the i-1-th Msg1 transmission among the Msg1 repetitions and an RO frequency hopping offset; i is a positive integer greater than or equal to 2.

[0330] Optionally, the step of determining frequency hopping parameters for Msg1 repetition transmission comprises: Determining the RO frequency hopping offset according to a configuration parameter of the correlation between the SSB and the RO or a rule predefined in a protocol.

[0331] Optionally, the processor 1110 further When the first configuration information further includes ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions, the RO is used to determine that the network side device supports repeated Msg1 transmissions.

[0332] Optionally, the pattern of the Msg1 repeat transmission is: A pattern in which the ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions and the RO for the first Msg1 transmission among the repeated Msg1 transmissions are associated with the same SSB; and a pattern in which the RO for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions and the RO for the first Msg1 transmission among the repeated Msg1 transmissions are associated with one or more different SSBs.

[0333] Optionally, the first message further carries a plurality of SSB combinations, where the RO for the second and subsequent Msg1 transmissions of the Msg1 repeat transmissions and the RO for the first Msg1 transmission of the Msg1 repeat transmissions are associated with one or more different SSBs.

[0334] Optionally, the processor 1110 is further configured to determine that the Msg1 repeated transmission supports frequency hopping when multiple ROs are deployed in the frequency domain.

[0335] Optionally, the processor 1110 is further configured to determine the number of repeated Msg1 transmissions according to the number of ROs for the second and subsequent repeated Msg1 transmissions in the first configuration information.

[0336] Optionally, the processor 1110 is further configured to determine SSBs associated with the second and subsequent Msg1 transmissions of the Msg1 repeat transmissions according to an SSB pattern configured by the network side equipment or determined in advance.

[0337] Optionally, the high frequency unit 1101 It is used to receive a first message carrying first configuration information for instructing to perform repeated transmission of Msg1 in the contention-free random access procedure.

[0338] Optionally, the first configuration information comprises: Random access type, Msg1 repeat transmission pattern, Msg1 repeat transmission count, Whether to enable RO frequency hopping, RO frequency hopping offset, Contains at least one of the RO sets.

[0339] Optionally, the random access type is: A four-step random access procedure consisting of one Msg1 transmission and one Msg3 transmission. A four-step random access procedure with single transmission of Msg1 and repeated transmission of Msg3. A four-step random access procedure with repeated transmission of Msg1 and one transmission of Msg3. It includes at least one of the four-step random access procedures of repeated Msg1 transmission and repeated Msg3 transmission.

[0340] Optionally, the first message includes at least one of a system message, a DCI, a MAC CE, and an RRC signaling.

[0341] In an embodiment of the present application, the terminal determines a first time-frequency resource for Msg1 repetition transmission based on the first configuration information for Msg1 repetition transmission transmitted from the network side device, and selects ROs at different frequency positions to obtain frequency diversity gain and avoid complete overlap of time-frequency resources between resources used for different Msg1 repetitions, thereby improving the coverage performance of Msg1 repetition transmission and reducing the complexity of PRACH resource allocation.

[0342] An embodiment of the present application further provides a network-side device, comprising: a processor; and a communication interface used for transmitting a first message carrying first configuration information of Msg1 repeated transmission to a terminal.

[0343] The embodiment of the network-side device corresponds to the embodiment of the method of the network-side device, and each implementation step and realization form of the method embodiment can be applied to the embodiment of the network-side device, and the same technical effects can be achieved.

[0344] Specifically, an embodiment of the present application further provides a network side device. As shown in Figure 12, the network side device 1200 includes an antenna 1201, a radio frequency device 1202, a baseband device 1203, a processor 1204, and a memory 1205. The antenna 1201 is connected to the radio frequency device 1202. In the uplink direction, the radio frequency device 1202 receives information through the antenna 1201 and transmits the received information to the baseband device 1203 for processing. In the downlink direction, the baseband device 1203 processes the information to be transmitted and transmits it to the radio frequency device 1202, and the radio frequency device 1202 processes the received information before transmitting it via the antenna 1201.

[0345] The method performed by the network side device in the above embodiment can be realized by the baseband device 1203, which includes a baseband processor.

[0346] The baseband device 1203 may, for example, include at least one baseband board having multiple chips installed thereon, and as shown in FIG. 12, one of the chips may, for example, be a baseband processor connected to memory 1205 via a bus interface to call programs in memory 1205 to perform the operations of the network equipment described in the above method embodiments.

[0347] The network side device may further include a network interface 1202, which may be, for example, a common public radio interface (CPRI).

[0348] Specifically, the network side device 1200 of the embodiment of the present invention further includes a command or program stored in the memory 1205 and executable by the processor 1204, and the processor 1204 calls the command or program in the memory 1205 to execute the method executed by each module shown in Figure 9, thereby achieving the same technical effect. In order to avoid repetition, detailed description will be omitted here.

[0349] An embodiment of the present application further provides a readable storage medium storing a program or command, which, when executed by a processor, can realize each step of the embodiment of the method for determining the time-frequency resource of the above-mentioned Msg1 repeated transmission, thereby achieving the same technical effect. In order to avoid repetition, detailed description will be omitted here.

[0350] Wherein, the processor is the processor in the terminal described in the above embodiment. The readable storage medium includes, for example, a computer readable storage medium such as a computer read only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0351] An embodiment of the present application is a chip comprising a processor and a communication interface, wherein the communication interface and the processor are coupled, and the processor executes a program or command to realize each step of the embodiment of the method for determining the time-frequency resource of the above-mentioned Msg1 repeated transmission. A chip that can achieve the same technical effect is also provided, and detailed description thereof will be omitted here to avoid repetition.

[0352] It should be understood that the chips described in the embodiments of the present application may also be referred to as system level chips, system chips, chip systems, system on chips, or the like.

[0353] An embodiment of the present application further provides a computer program / program product stored in a storage medium, which can be executed by at least one processor to realize each step of the embodiment of the method for determining time-frequency resources for Msg1 repeated transmission and achieve the same technical effects, and detailed description thereof will be omitted here to avoid repetition.

[0354] An embodiment of the present application further provides a system for determining time-frequency resources for repeated Msg1 transmission, comprising: a terminal used to perform the steps of the method for determining time-frequency resources for repeated Msg1 transmission described above; and a network side device used to perform the steps of the method for determining time-frequency resources for repeated Msg1 transmission described above.

[0355] It should be noted that, in this specification, the terms "comprise," "consist," or any other variation thereof, are intended to include a non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not expressly specified or inherent in such process, method, article, or apparatus. Unless otherwise specified, elements qualified by the phrase "comprise..." do not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element. It should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, and may include performing functions in an essentially simultaneous manner or in the reverse order, depending on the functionality involved. For example, the described method can be performed in an order different from that described, and various steps can be added, omitted, or combined. It should be noted that features described with reference to some examples can be combined with other examples.

[0356] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be realized in the form of a combination of software and a necessary common hardware platform, and of course, they can also be realized by hardware, but in many cases the former is a more preferred embodiment. Based on this view, the technical solutions of the present application can be substantially embodied in the form of a computer software product, which is stored in a storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes a plurality of instructions that cause a terminal (which may be a mobile phone, computer, server, air conditioner, network device, etc.) to execute the methods described in each embodiment of the present application.

[0357] Although the examples of the present application have been described above with reference to the drawings, the present application is not limited to the above-mentioned specific embodiments, which are merely illustrative and not limiting. Based on the suggestions of the present application, many forms that a person skilled in the art can make without departing from the spirit of the present application and the scope of protection of the claims are all within the scope of protection of the present application.

[0358] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application filed on December 24, 2021, bearing application number 202111602745.1 and entitled "Method, device and terminal for determining time-frequency resources for Msg1 repetitive transmission," the entire contents of which are incorporated herein by reference.

Claims

1. a step of receiving, by a terminal, a first message transmitted from a network side device, the first message including first configuration information for Msg1 repeated transmission; determining, by the terminal, a first time-frequency resource for repeated transmission of Msg1 based on the first configuration information; The step of determining a first time-frequency resource for repeated transmission of Msg1 includes: determining a physical random access channel (PRACH) resource for repeated transmission of Msg1; Including, the first arrangement information includes at least one of a pattern of Msg1 repeated transmission and a second threshold for indicating a selection threshold of a correlation SSB of the Msg1 repeated transmission; The step of determining a PRACH resource for repeated transmission of Msg1 includes: determining an SSB or an SSB combination associated with the Msg1 repeated transmission according to a pattern of the Msg1 repeated transmission and a second threshold value; determining a set of candidate ROs of PRACH resources for the Msg1 repeat transmission according to a correlation between ROs and SSBs or SSB combinations associated with the Msg1 repeat transmission; determining an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions; The second threshold value is set by the first message, or is used as a threshold value for selecting a correlated SSB during a random access procedure of Msg3 repetition transmission; The step of determining an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions comprises: determining a time domain location of the RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions; determining a frequency domain location of the RO corresponding to each Msg1 transmission of the Msg1 repeat transmission according to the frequency hopping parameter; determining a time domain position of an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions, In a pattern of Msg1 repeat transmission in which multiple ROs are associated with the same SSB, the time domain positions of the multiple ROs in the Msg1 repeat transmission correspond to correlation periods between multiple consecutive SSBs and the ROs; The correlation period corresponding to the first Msg1 of the repeated Msg1 transmission is determined by a reference time point, which is predefined in the protocol. A method for determining time-frequency resources for repeated transmission of Msg1.

2. The first arrangement information is A combination of multiple synchronization signal blocks (SSB), A location parameter for the correlation between SSB and random access channel transmission opportunities RO; a first threshold for indicating a trigger threshold for repeated Msg1 transmission; Whether to enable RO frequency hopping; RO frequency hopping offset, the number of frequency hops or the frequency hopping step size, Number of times Msg1 is repeated, Preamble resource set for Msg1 repeated transmission, The method for determining time-frequency resources for Msg1 repetition transmission according to claim 1 , further comprising at least one of an RO mask for Msg1 repetition transmission.

3. The Msg1 repeat transmission pattern is: A pattern in which multiple ROs are associated with the same SSB, or The method for determining time-frequency resources for Msg1 repetitive transmission according to claim 2 , wherein a plurality of ROs includes a pattern associated with different SSBs.

4. The step of determining a first time-frequency resource for Msg1 repeat transmission further includes a step of determining whether to perform Msg1 repeat transmission, and the step of determining whether to perform Msg1 repeat transmission and determining a physical random access channel (PRACH) resource for Msg1 repeat transmission comprises: determining to perform repeated transmission of Msg1 when a first condition is satisfied, and determining a PRACH resource for repeated transmission of Msg1; The first condition is the four-step random access fails N times, the value of N being predefined in the protocol or configured by the first message; The first signaling is used to instruct the terminal to perform Msg1 repeated transmission, and the first signaling includes instruction information related to RO frequency hopping; the signal quality of the downlink signal is equal to or lower than the first threshold; 3. The method for determining the time-frequency resource for Msg1 repeated transmission according to claim 2, wherein the first threshold is set by the first message or is also used as a threshold for determining whether to execute a random access procedure for Msg3 repeated transmission.

5. The fact that the above four-step random access has failed N times means that In one four-step random access procedure, the terminal attempts to send Msg1 once N times but does not receive the corresponding Msg2, or In one four-step random access procedure, the terminal transmits Msg1 once and N times to receive the corresponding Msg2, but fails to transmit Msg3; The method for determining time-frequency resources for repeated Msg1 transmission according to claim 4 , wherein the value of N is predefined in a protocol or configured by the first message.

6. the step of determining an SSB associated with the Msg1 repeated transmission based on the pattern of the Msg1 repeated transmission and the second threshold value, In a pattern of Msg1 repeated transmission in which a plurality of ROs are associated with the same SSB, the terminal compares the signal qualities of all detected SSBs with the second threshold and selects an SSB whose signal quality is higher than the second threshold as an SSB associated with the Msg1 repeated transmission; Alternatively, when there are a plurality of SSBs whose signal quality is higher than the second threshold, selecting one SSB from the plurality of SSBs by the terminal or randomly as an SSB related to the Msg1 repeated transmission; Alternatively, the method for determining the time-frequency resource for the Msg1 repeated transmission according to claim 1 further comprises a step of selecting, by the terminal or randomly, one SSB as the SSB associated with the Msg1 repeated transmission when there is no SSB whose signal quality is higher than the second threshold.

7. the step of determining an SSB combination associated with the Msg1 repeated transmission based on the pattern of the Msg1 repeated transmission and the second threshold value, 2. The method for determining time-frequency resources for Msg1 repeat transmission according to claim 1, comprising the step of comparing signal quality of SSB combinations with the second threshold in a pattern of Msg1 repeat transmission in which multiple ROs are associated with different SSBs, and selecting one SSB combination from the SSB combinations as the SSB combination associated with the Msg1 repeat transmission.

8. 3. The method for determining time-frequency resources for repeated Msg1 transmission according to claim 2, further comprising the step of: when the first configuration information further includes ROs for a second and subsequent Msg1 transmissions among repeated Msg1 transmissions, the terminal determining that a network side device supports repeated Msg1 transmissions.

9. The Msg1 repeat transmission pattern is: a pattern in which the ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions and the RO for the first Msg1 transmission among the repeated Msg1 transmissions are associated with the same SSB; 9. The method for determining the time-frequency resource for Msg1 repeated transmissions according to claim 8, further comprising: a pattern in which the RO for the second and subsequent Msg1 transmissions among the Msg1 repeated transmissions and the RO for the first Msg1 transmission among the Msg1 repeated transmissions are associated with one or more different SSBs.

10. 10. The method for determining time-frequency resources for Msg1 repeated transmissions according to claim 9, wherein the first message further includes a plurality of SSB combinations when the ROs for the second and subsequent Msg1 transmissions among the Msg1 repeated transmissions and the RO of the first Msg1 transmission among the Msg1 repeated transmissions are associated with one or more different SSBs.

11. The determination method includes:

9. The method for determining the time-frequency resource for repeated Msg1 transmission according to claim 8, further comprising a step of determining the number of repeated Msg1 transmissions based on the number of ROs for the second and subsequent Msg1 transmissions among the repeated Msg1 transmissions in the first configuration information.

12. The step of receiving a first message carrying first configuration information for repeated transmission of Msg1 from a network side device by the terminal includes: The method includes receiving, by a terminal, a first message carrying first configuration information for instructing a terminal to perform repeated transmission of Msg1 in a contention-free random access procedure; The first arrangement information is Random access type, Msg1 repeat transmission pattern, Number of times Msg1 is repeated, Whether to enable RO frequency hopping; RO frequency hopping offset, at least one of the RO sets, The method for determining time-frequency resources for Msg1 repetitive transmission according to claim 1 .

13. determining a frequency domain location of an RO corresponding to each Msg1 transmission among the repeated Msg1 transmissions according to the frequency hopping parameters, a frequency-domain location of an RO of a first Msg1 transmission among the repeated Msg1 transmissions is determined by a rule predefined in a protocol or by one RO randomly selected from a set of ROs at the time-domain location of the first Msg1 transmission; determining a frequency-domain location of an RO for an i-th Msg1 transmission among the repeated Msg1 transmissions using the RO frequency-domain location of the i-1-th Msg1 transmission among the repeated Msg1 transmissions and an RO frequency hopping offset; The method for determining time-frequency resources for repeated transmission of Msg1 according to claim 1 , wherein i is a positive integer of 2 or more.

14. A terminal comprising a processor and a memory, wherein a program or command executable by the processor is stored in the memory, and when the program or command is executed by the processor, the terminal realizes the steps of the method for determining time-frequency resources for Msg1 repetitive transmission described in any one of claims 1 to 13.

15. A system for determining time-frequency resources for Msg1 repetitive transmission, comprising a terminal and network side equipment, wherein the terminal is used to perform the steps of the method for determining time-frequency resources for Msg1 repetitive transmission described in any one of claims 1 to 13.

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