Communication method, terminal equipment and network equipment

Abstract

The invention relates to a communication method, terminal equipment and network equipment. The method comprises: a terminal device determines whether to perform repeated transmission of a physical random access channel (PRACH) based on first information; wherein the first information is processed by the terminal equipment.

Description

Communication method, terminal device and network device Technical Field

[0001] The present application relates to the field of communications, and more specifically, to a communication method, terminal equipment, and network equipment. Background Art

[0002] Coverage is a key factor operators consider when commercializing cellular communication networks. Research projects have expanded the coverage of the PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), and Msg3 (Message 3). However, enhancing coverage of the PRACH (Physical Random Access Channel) remains a challenge.

[0003] Summary of the Invention

[0004] Embodiments of the present application provide a communication method, a terminal device, and a network device.

[0005] An embodiment of the present application provides a communication method, including:

[0006] The terminal device determines whether to perform repeated transmission of the physical random access channel PRACH based on the first information; wherein the first information is obtained by processing by the terminal device.

[0007] An embodiment of the present application provides a communication method, including:

[0008] The network device receives a physical random access channel PRACH; wherein, whether the PRACH is a repeated transmission is determined by the terminal device based on first information, and the first information is obtained by processing by the terminal device.

[0009] An embodiment of the present application provides a terminal device, including:

[0010] The first processing unit is used to determine whether to repeat the transmission of the physical random access channel PRACH based on the first information; wherein the first information is obtained by processing the terminal device.

[0011] An embodiment of the present application provides a network device, including:

[0012] The second communication unit is used to receive a physical random access channel PRACH; wherein, whether the PRACH is a repeated transmission is determined by the terminal device based on first information, and the first information is obtained by processing by the terminal device.

[0013] An embodiment of the present application provides a terminal device, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the terminal device executes the above-mentioned communication method.

[0014] An embodiment of the present application provides a network device, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the network device executes the above-mentioned communication method.

[0015] An embodiment of the present application provides a network device, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, so that the network device executes the above-mentioned communication method.

[0016] An embodiment of the present application provides a chip for implementing the above-mentioned communication method.

[0017] Specifically, the chip includes: a processor, which is used to call and run a computer program from a memory, so that a device equipped with the chip executes the above-mentioned communication method.

[0018] An embodiment of the present application provides a computer-readable storage medium for storing a computer program, which, when executed by a device, enables the device to execute the above-mentioned communication method.

[0019] An embodiment of the present application provides a computer program product, including computer program instructions, which enable a computer to execute the above-mentioned communication method.

[0020] An embodiment of the present application provides a computer program, which, when executed on a computer, enables the computer to execute the above-mentioned communication method.

[0021] An embodiment of the present application provides a communication system, including: a terminal device, used to execute the above-mentioned communication method; and a network device, used to execute the above-mentioned communication method.

[0022] In the embodiment of the present application, the terminal device can determine whether to perform repeated PRACH transmission based on the results obtained by its own processing. In this way, the terminal device can be enabled with the function of enabling repeated PRACH transmission, and then repeated PRACH transmission can be performed when needed. When repeated PRACH transmission is performed, PRACH coverage can be enhanced, thereby improving PRACH transmission performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of an application scenario according to an embodiment of the present application.

[0024] FIG2 is a schematic diagram of a time domain configuration of a PRACH resource.

[0025] FIG3 is a schematic diagram of resource configuration in the PRACH frequency domain.

[0026] FIG4 is a schematic diagram of the mapping relationship between SSB and RO.

[0027] FIG5 is a schematic flowchart of a communication method according to an embodiment of the present application.

[0028] FIG6 is a schematic flowchart of a communication method according to another embodiment of the present application.

[0029] FIG7 is a schematic diagram showing the composition of DCI format 1_0 according to an embodiment of the present application.

[0030] 8 to 15 are various example diagrams of composition patterns of multiple target transmission resources according to embodiments of the present application.

[0031] FIG16 is a schematic block diagram of a terminal device according to an embodiment of the present application.

[0032] FIG17 is a schematic block diagram of a terminal device according to another embodiment of the present application.

[0033] FIG18 is a schematic block diagram of a network device according to an embodiment of the present application.

[0034] FIG19 is a schematic block diagram of a communication device according to an embodiment of the present application.

[0035] FIG20 is a schematic block diagram of a chip according to an embodiment of the present application.

[0036] Figure 21 is a schematic block diagram of a communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0038] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced Long Term Evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE on unlicensed spectrum (LTE-U) system, NR on unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity) system. Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems. Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication, and the embodiments of the present application can also be applied to these communication systems.In one embodiment, the communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario. In one embodiment, the communication system in the embodiment of the present application can be applied to an unlicensed spectrum, wherein the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to an authorized spectrum, wherein the authorized spectrum can also be considered as an unshared spectrum. The embodiments of the present application describe various embodiments in conjunction with network devices and terminal devices, wherein the terminal device can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0039] The terminal device may be a station (STAION, ST) in a WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future-evolved Public Land Mobile Network (PLMN) network, etc. In the embodiment of the present application, the terminal device may be deployed on land, including indoors or outdoors, handheld, wearable, or vehicle-mounted; may also be deployed on water (such as a ship, etc.); and may also be deployed in the air (such as an airplane, a balloon, and a satellite, etc.). In the embodiments of the present application, the terminal device may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home. As an example and not a limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices, also known as wearable smart devices, are a general term for wearable devices that are intelligently designed and developed using wearable technology for everyday wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not just hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0040] In an embodiment of the present application, a network device may be a device for communicating with a mobile device. The network device may be an access point (AP) in a WLAN, a base station (BTS) in a GSM or CDMA, a base station (NodeB, NB) in a WCDMA, an evolved base station (eNB or eNodeB) in an LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, a network device (gNB) in an NR network, or a network device in a future evolved PLMN network or a network device in an NTN network. As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. Optionally, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the network device may also be a base station set up in a location such as land or water. In an embodiment of the present application, the network device may provide services for a cell, and the terminal device may communicate with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell may be a cell corresponding to the network device (for example, a base station), and the cell may belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0041] Figure 1 exemplarily shows a communication system 100. The communication system includes a network device 110 and two terminal devices 120. In one embodiment, the communication system 100 may include multiple network devices 110, and each network device 110 may include other number of terminal devices 120 within its coverage area, which is not limited in this embodiment of the present application. In one embodiment, the communication system 100 may also include other network entities such as a Mobility Management Entity (MME) and an Access and Mobility Management Function (AMF), which is not limited in this embodiment of the present application. Among them, the network device may include an access network device and a core network device. That is, the wireless communication system also includes multiple core networks for communicating with the access network device. The access network device may be an evolutionary base station (evolutional node B, referred to as eNB or e-NodeB) macro base station, micro base station (also called "small base station"), micro base station, access point (AP), transmission point (TP) or new generation Node B (gNodeB) in a long-term evolution (LTE) system, a next-generation (mobile communication system) (next radio, NR) system or an authorized auxiliary access long-term evolution (LAA-LTE) system. It should be understood that the device with a communication function in the network / system in the embodiment of the present application may be referred to as a communication device. Taking the communication system shown in Figure 1 as an example, the communication device may include a network device and a terminal device with a communication function. The network device and the terminal device may be specific devices in the embodiment of the present application, which will not be repeated here; the communication device may also include other devices in the communication system, such as a network controller, a mobile management entity and other network entities, which are not limited in the embodiment of the present application. It should be understood that the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this document simply describes the association relationship between associated objects, indicating that three possible relationships exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship. It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association relationship.For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B. In the description of the embodiments of this application, the term "correspondence" can mean that there is a direct or indirect correspondence relationship between two things, it can also mean that there is an association relationship between the two things, and it can also mean a relationship between indicating and being indicated, configuring and being configured, etc.

[0042] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below. The following relevant technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application.

[0043] 1. New Radio (NR) PRACH (Physical Random Access Channel) Channel Design: NR supports four long preamble formats (all 839 characters long). Formats 0 and 1 follow the LTE formats. Format 0 is used for typical macrocell coverage, format 1 for ultra-large cell coverage, format 2 uses more sequence repetitions for coverage enhancement, and format 3 is used in high-speed mobility scenarios such as high-speed rail. NR also supports three series of short preamble formats, A, B, and C, to suit different application scenarios.

[0044] 2. Configuration of PRACH resources in NR: (1) PRACH resource period. On the one hand, the period of PRACH resources affects the random access delay. A shorter PRACH period can shorten the random access delay; conversely, a longer PRACH period increases the random access delay. On the other hand, the period of PRACH resources also affects the resource overhead occupied by PRACH. A distinctive feature of NR is the need to support beam scanning. To support random access requests from UEs distributed in various beams, the system needs to configure corresponding PRACH resources for each beam direction. Therefore, the NR standard supports PRACH periods of {10, 20, 40, 80, 160} ms. Network equipment can weigh multiple factors such as delay and system overhead to set an appropriate PRACH period. (2) Time domain configuration of PRACH resources. In order to determine the time domain resources of PRACH, on the basis of determining the PRACH period, it is necessary to further determine the time domain distribution of PRACH resources within the PRACH period. In FR1, the PRACH resource configuration information indicates the subframe number of one or more subframes where the PRACH resources are located; for FR2, in order to facilitate the indication of resources, the time slot number of one or more reference time slots where the PRACH resources are located is indicated with a 60KHz subcarrier spacing as the reference time slot. In FR1, one subframe corresponds to one 15KHz PRACH time slot, or two 30KHz PRACH time slots (as shown in Figure 2, one subframe corresponds to two PRACH time slots); in FR2, one reference 60KHz time slot corresponds to one 60KHz PRACH time slot, or two 120KHz PRACH time slots (as shown in Figure 2, one time slot corresponds to two PRACH time slots). Within each PRACH time slot, as shown in Figure 2, the network can configure one or more ROs (PRACH Occasions). The so-called PRACH Occasion is the time-frequency resource that carries the Preamble transmission. Furthermore, since NR supports a mixed DL / UL time slot structure, the network can configure the starting symbol of the time domain resources occupied by the first PRACH occasion within the PRACH time slot. When the first symbol within the PRACH time slot needs to transmit downlink control information, the resources required for the corresponding downlink control information transmission can be reserved by configuring the appropriate starting symbol. (3) Resource configuration of PRACH frequency domain. In the frequency domain, NR supports the configuration of 1, 2, 4 or 8 FDM (Frequency-division multiplexing) PRACH resources to expand PRACH capacity. When there are more than one PRACH resources configured in the frequency domain, these PRACH resources are continuously distributed in the frequency domain. As shown in Figure 3, the number of FDM is equal to 4, that is, there are 4 PRACH resources configured in the frequency domain.The network notifies the offset of the starting PRB of the first RO resource in the frequency domain relative to the starting physical resource block (PRB) of the BWP (Bandwidth Part) (ie, BWP PRB 0 shown in FIG3 ).

[0045] 3. Initiation of PRACH transmission: Before the physical layer random access process begins: Layer 1 will receive an index set of SS / PBCH (Synchronization Signal and Physical Broadcast Channel) blocks from a higher layer and provide a corresponding RSRP (Reference Signal Receiving Power) measurement result to the higher layer; Layer 1 can receive an indication from the higher layer to perform Type-1 random access or Type-2 random access; Layer 1 receives the following information from the higher layer: (1) Configuration of PRACH transmission parameters, such as PRACH preamble format, time domain resources and frequency domain resources for PRACH transmission, etc.; (2) PRACH preamble sequence determines the root sequence and cyclic shift parameters, such as the index of the logical root sequence table, cyclic shift (Ncs), set type (unrestricted, restricted set A, or restricted set B), etc.; When receiving a PRACH transmission request from a higher layer or a PDCCH command, Layer 1 starts to initiate the random access process. If the random access procedure is initiated by a PDCCH command, the SCS (subcarrier spacing) transmitted by the PRACH is the same as the SCS indicated by higher layers. There are three ways to trigger the random access procedure: PDCCH command triggering: the gNB uses a special DCI (Downlink Control Information) format 1_0 to inform the UE that the random access procedure needs to be reinitiated; MAC (Media Access Control) layer triggering: the UE selects a preamble to initiate the random access procedure; RRC (Radio Resource Control) layer triggering: such as initial access, re-establishment, handover, transition from RRC_INACTIVE to RRC_CONNECTED state, request for other SI (System Information), and RRC requests during synchronization reconfiguration.

[0046] 4. Mapping of SSB (Synchronization Signal Block) and PRACH Occasion: Before the UE initiates anytime access, the UE will measure and evaluate the signal quality of the cell and the signal strength of each SSB in the cell. When initiating PRACH, the UE sends a preamble on the PRACH occasion corresponding to the SSB with the strongest or stronger signal. If the network successfully receives the preamble, it will obtain the downlink beam information of the UE based on the PRACH occasion where the preamble is located, and then use the beam information for subsequent communications, such as msg2, msg4, etc. There are many possible proportional relationships between SSB and PRACH occasion (ie RO): 1) one-to-one mapping; 2) many-to-one mapping; 3) one-to-many mapping. Considering the support of diverse scenarios, these three proportional relationships are supported in the NR standard. For example, in scenarios with a small number of users, multiple SSBs can be mapped to the same PRACH occasion to conserve PRACH resources. Multiple SSBs can share the same preamble within the same PRACH occasion, meaning different SSBs correspond to different preamble subsets within the same PRACH occasion. In scenarios with a large number of users, a single SSB can be mapped to multiple PRACH occasions to provide sufficient PRACH capacity. The system has multiple actual transmitted SSBs and multiple configured PRACH occasions and corresponding preamble resources. Both the network and the UE need to know which PRACH occasion and preamble resources each SSB corresponds to. In NR, SSB-RO mapping uses a frequency-domain-first design, specifically: within each PRACH occasion, in ascending order of preamble index; in ascending order of PRACH occasion numbers for FDM; within a PRACH slot, in ascending order of PRACH occasion numbers for time-division multiplexing; and in ascending order of PRACH slots. For scenarios where the base station can only receive a single beam, multiple frequency-division multiplexed PRACH occasions can be configured to correspond to the same SSB. Taking 8 SSBs and PRACH_FDM=4 (Frequency Division Multiplexing 4 ROs) as an example, Figure 4 shows the mapping relationship between SSBs and ROs for different SSB_per_ROs (1 / 4, 1 / 2, 1, 2, 8).As shown in part 401 of Figure 4, assuming that there are a total of 8 SSBs in the system, when PRACH_FDM=4 and SSB_per_RO (that is, the number of SSBs associated with a transmission resource)=1 / 4, it means that one SSB is mapped to 4 ROs. Since PRACH_FDM=4, one SSB can be mapped to one time domain RO (composed of 4 ROs in the frequency domain). Since the time domain RO is frequency-division multiplexed into 4 frequency domain ROs, one SSB is mapped to 4 frequency domain ROs in the same time domain. For example, in part 401 of Figure 4, SSB1 is mapped to the 4 frequency domain ROs in the first time domain, SSB2 is mapped to the 4 frequency domain ROs in the second time domain, and so on. We will not go into details one by one. Assuming that there are a total of 8 SSBs in the system, when PRACH_FDM = 4 and SSB_per_RO (that is, the number of SSBs associated with a transmission resource) = 1 / 2, then 2 SSBs are mapped to one time domain RO. Since the time domain RO is frequency-division multiplexed into 4 frequency domain ROs, one SSB is mapped to 2 frequency domain ROs in the same time domain. For example, in part 402 of Figure 4, SSB1 is mapped to 2 frequency domain ROs in the first time domain, and SSB2 is mapped to 2 frequency domain ROs in the first time domain. SSB2 is located after SSB1 and will not be described one by one. Assuming that there are a total of 8 SSBs in the system, when PRACH_FDM = 4 and SSB_per_RO (that is, the number of SSBs associated with a transmission resource) = 1, then 4 SSBs are mapped to one time domain RO. Since the time domain RO is frequency-division multiplexed into 4 frequency domain ROs, one SSB is mapped to one frequency domain RO in one time domain. For example, in part 403 of Figure 4, SSB1 is mapped to the first frequency domain RO in the first time domain, and SSB2 is mapped to the second frequency domain RO in the first time domain. SSB2 is located after SSB1 and will not be described one by one. Assuming that there are a total of 8 SSBs in the system, when PRACH_FDM=4 and SSB_per_RO (i.e., the number of SSBs associated with one transmission resource)=2, the 8 SSBs are mapped to one time domain RO. Since the time domain RO is frequency-division multiplexed into 4 frequency domain ROs, 2 SSBs are mapped to one frequency domain RO in one time domain. For example, in part 404 of Figure 4, SSB1 and SSB2 are simultaneously mapped to the first frequency domain RO in the first time domain, and no further description is given. Assuming that there are a total of 8 SSBs in the system, when PRACH_FDM=4 and SSB_per_RO (i.e., the number of SSBs associated with one transmission resource)=8, the 8 SSBs are mapped to one time domain RO, and the 8 SSBs are mapped to one frequency domain RO in one time domain. For example, in part 405 of Figure 4, SSB1 to SSB8 are simultaneously mapped to one frequency domain RO in the first time domain, and no further description is given.

[0047] 5. PRACH resource selection for sending preamble: The PRACH mask index is used to determine the PRACH resource location for the non-contention-based random access procedure. There are four ways to configure the non-contention-based PRACH mask index: 1) indicated by the parameter PRACH-ConfigDedicated->ra-ssb-OccasionmaskIndex in Message 4; 2) indicated by the parameter BeamFailureRecoveryConfig->ra-ssb-OccassionMakIndex in Message 4; 3) indicated by SI-SchedulingInfo->SI-RequestResources->ra-ssb-OccassionMakIndex in SIB1 (System Information Block 1); and 4) indicated by the PDCCH order via the PRACH mask index in DCI format 1_0. Coverage is one of the key factors that operators consider when commercializing cellular communication networks, as it directly affects service quality as well as capital expenditure and operating costs. In most deployment scenarios, UL performance can be a bottleneck, while some vertical use cases, such as video uploads, experience high UL traffic. Rel-17 Study Item 900061, "NR Coverage Enhancement," extends NR coverage for some bottleneck channels identified in Study Item 860036, "NR Coverage Enhancement Study," specifically PUSCH, PUCCH, and Msg3. However, due to the limited range of Rel-17 Wi-Fi, not all coverage enhancement requirements are met. PRACH transmission is crucial in many processes, such as initial access and beam failure recovery. Therefore, improving PRACH coverage performance becomes a critical issue.

[0048] FIG5 is a schematic flow chart of a communication method 500 according to an embodiment of the present application. The method includes at least part of the following contents:

[0049] S510. The terminal device determines whether to perform repeated transmission of a physical random access channel PRACH based on first information; wherein the first information is obtained by processing by the terminal device.

[0050] FIG6 is a schematic flow chart of a communication method 600 according to an embodiment of the present application. The method includes at least part of the following contents:

[0051] S610. The network device receives a physical random access channel PRACH; wherein, whether the PRACH is a repeated transmission is determined by the terminal device based on first information, and the first information is obtained by processing by the terminal device.

[0052] In the aforementioned embodiments, the network device may be an access network device, for example, a gNB, an eNB, a base station, etc., without enumerating them exhaustively.

[0053] The terminal device determines, based on the first information, whether to perform repeated transmission of the PRACH, which may include: the terminal device determines to perform repeated transmission of the PRACH when the first information satisfies a first condition. In addition, it may also include: the terminal device determines not to perform repeated transmission of the PRACH when the first information does not satisfy the first condition.

[0054] In a possible implementation, the terminal device determines whether to perform repeated transmission of the PRACH only based on whether the first information satisfies the first condition.

[0055] Optionally, the terminal device processing refers to the last transmission of PRACH by the terminal device; accordingly, the first information includes: the transmission result of the last transmission of PRACH; determining whether the first information satisfies the first condition may include: the terminal device determines that the first condition is satisfied when the transmission result of the last transmission of PRACH is a transmission failure. Here, transmitting PRACH may refer to the transmission of a preamble on PRACH; the preamble may be the preamble in msg (message) 1 of a 4-step random access, or the preamble in msgA of a 2-step random access. That is, the embodiment of the present application can be applied to a 4-step random access process as well as to a 2-step random access. Regarding the manner in which the terminal device determines the transmission result of the last transmission of PRACH, it may include one of the following: when the terminal device does not receive a corresponding random access response (RAR, Random Access Response) after the last transmission of PRACH, determining that the transmission result of the last transmission of PRACH is a transmission failure; when the terminal device does not receive a corresponding conflict resolution message after the last transmission of PRACH, determining that the transmission result of the last transmission of PRACH is a transmission failure. That is, if the terminal device does not receive any of the RAR and contention resolution messages after the last PRACH transmission, it can be determined that the transmission result of the last PRACH transmission was a transmission failure. In some scenarios, the aforementioned contention resolution message can also be called contention resolution or contention resolution message.

[0056] Take the processes of different random access processing as an example: in the 4-step random access process, after the terminal device transmits PRACH once (i.e., sends Msg 1 to the network device), if the terminal device does not receive a RAR replied by the network device within the RAR window, it is considered that the transmission result of this PRACH transmission is a transmission failure; if the terminal device successfully receives a RAR within the RAR window and the index of the preamble carried in the RAR message is the same as the index of the preamble in Msg 1 sent by the terminal device, the terminal device sends Msg 3 to the network device; if the terminal device correctly receives Msg 4 and determines that Msg 4 indicates that it has completed contention resolution (Contention Resolution), the transmission result of this PRACH transmission is determined to be successful; otherwise, the transmission result of this PRACH transmission is determined to be a transmission failure. In the two-step random access process, after the terminal device transmits PRACH once (i.e., sends Msg A to the network device), if the terminal device does not receive MsgB sent by the network device (the MsgB is used to carry RAR and / or conflict resolution message), it is determined that the transmission result of this transmission of PRACH is a transmission failure; if the terminal device receives MsgB sent by the network device, it is determined that the transmission result of this transmission of PRACH is a transmission success.

[0057] Optionally, the terminal device processing refers to the terminal device measuring the first downlink signal; accordingly, the first information includes: the measurement result of the first downlink signal; determining whether the first information meets the first condition may include: the terminal device determining that the first condition is met when the measurement result of the first downlink signal is less than a first threshold value.

[0058] The method for obtaining the measurement result of the first downlink signal may be: before initiating access, the terminal device measures the first downlink signal to obtain the measurement result of the first downlink signal. The measurement result of the first downlink signal may be represented by at least one of the following: RSRP (Reference Signal Receiving Power), RSRQ (Reference Signal Receiving Quality), RSSI (Received Signal Strength Indicator). The number of the aforementioned first downlink signals may be one or more. The first downlink signal may be all downlink signals of the terminal device, or the first downlink signal may refer to a part of the designated downlink signals in all downlink signals of the terminal device. It should also be noted about the measurement result of the aforementioned first downlink signal that when the first downlink signal is not all downlink signals on all beams of the terminal device, the terminal device may continue to measure all downlink signals, but only use part of the downlink signals as the first downlink signal, that is, the first information only includes the measurement results of part of the downlink signals (i.e., the first downlink signal). The measurement result of the first downlink signal is: obtained by measuring the first downlink signal corresponding to the downlink beam of the terminal device; or obtained by measuring the first downlink signal corresponding to the designated downlink beam of the terminal device; or obtained by measuring the first downlink signal corresponding to the designated downlink beam of the terminal device.

[0059] Among them, the measurement result of the first downlink signal is obtained by measuring the downlink signal corresponding to the downlink beam of the terminal device; specifically, it can mean that: the terminal device can measure the first downlink signals corresponding to all downlink beams; accordingly, when the measurement results of the first downlink signals corresponding to all downlink beams are less than the first threshold value, the terminal device determines that the first condition is met; otherwise, it is determined that the first condition is not met. Here, all downlink beams can refer to all beams that the terminal device determines to use; for example, when the random access is CBRA (Contention Based Random Access, contention-based random access), the terminal device will determine the beam it uses (that is, all beams it uses). In this case, the first downlink signal can be all downlink signals that the terminal device can measure.

[0060] The measurement result of the first downlink signal is obtained by measuring the downlink signal corresponding to the designated downlink beam of the terminal device; specifically, it may mean that: the terminal device can measure the first downlink signal corresponding to the designated downlink beam; accordingly, when the measurement results of the first downlink signal corresponding to the designated downlink beam are all less than the first threshold value, the terminal device determines that the first condition is met; otherwise, it is determined that the first condition is not met. In this case, the first downlink signal may be all downlink signals that the terminal device can measure in one or more designated downlink beams. The measurement result of the first downlink signal is obtained for the designated downlink signal corresponding to the designated downlink beam of the terminal device; specifically, it may mean that: the terminal device can measure the designated first downlink signal corresponding to the designated downlink beam; accordingly, when the measurement result of the designated first downlink signal corresponding to the designated downlink beam is less than the first threshold value, the terminal device determines that the first condition is met; otherwise, it is determined that the first condition is not met. In this case, the first downlink signal may be the designated downlink signal of the terminal device on each designated downlink beam in the one or more designated downlink beams. The designated downlink beam of the terminal device may be indicated by a network device; for example, when the random access is CFRA (Contention Free Random Access), the network device may indicate a beam to the terminal device; in this embodiment, the beam indicated by the network device to the terminal device is referred to as the designated downlink beam of the terminal device. The designated downlink signal corresponding to the designated downlink beam may also be indicated by the network device; for example, when the random access is CFRA, the network device may indicate a measurement signal corresponding to the beam to the terminal device in addition to indicating a beam to the terminal device; in this embodiment, the measurement signal corresponding to the beam indicated by the network device to the terminal device is referred to as the designated downlink signal corresponding to the designated downlink beam.

[0061] In this embodiment, the downlink signal is specifically a downlink reference signal, which may include at least one of the following: SSB (Synchronization Signal Block), CSI-RS (Channel State Information-Reference Signal). Furthermore, in addition to being at least one of the above two types, the downlink signal in this embodiment may also include at least one of the following: DMRS (DeModulation Reference Signal), PT-RS (Phase-tracking reference signal), etc. All possible downlink signal types are not exhaustively listed here.

[0062] The first threshold value may be preset, determined by the terminal device, or configured by the network device.

[0063] The first threshold value may be different from any threshold value specified in the relevant protocol, that is, the first threshold value is a threshold value specifically used to determine whether to perform repeated transmission of PRACH. The first threshold value may also be referred to as any one of the following: a dedicated PRACH repeated transmission threshold value, a dedicated PRACH repeated transmission RSRP threshold value, a dedicated msg1 repeated transmission RSRP threshold value, msg1RSRP threshold value (rsrp-ThresholdMsg1), rsrp-ThresholdPreamble (preamble RSRP threshold value), rsrp-ThresholdPRACH (PRACH RSRP threshold value), repeated transmission RSRP threshold value (rsrp-ThresholdRepetition), etc.; all possible names are not exhaustively listed here. When the first threshold value is configured by a network device, the processing of the network device may also include: the network device configures the first threshold value to the terminal device; the first threshold value is used by the terminal device to judge the first downlink signal detection result to determine whether to perform repeated transmission of PRACH. The first threshold value can be carried by one of the following: feature combination preamble (FeatureCombinationPreambles); random access channel RACH common configuration parameter (RACH-ConfigCommon); common configuration parameter of message msg A (MsgA-ConfigCommon); beam failure recovery configuration (BeamFailureRecoveryConfig); msg A configuration parameter (RACH-ConfigCommonTwoStepRA) in the RACH common configuration parameter.

[0064] When the first threshold value is determined by the terminal device, the first threshold value is determined based on a second threshold value; wherein the second threshold value is configured by the network device. That is, the processing of the network device may further include: the network device configuring the second threshold value for the terminal device, the second threshold value being used by the terminal device to determine the first threshold value. Here, the second threshold value may refer to a threshold value specified in a relevant protocol, for example, the second threshold value may be any one of the following: rsrp-ThresholdSSB, i.e., the RSRP threshold value for selecting SSB (Synchronization Signal Block) in 4-step random access; rsrp-ThresholdCSI-RS, i.e., the RSRP threshold value for selecting CSI-RS for 4-step random access; msgA-RSRP-ThresholdSSB, i.e., the RSRP threshold value for selecting SSB for 2-step random access; rsrp-ThresholdSSB-SUL, i.e., the RSRP threshold value for selecting between a normal uplink (NUL) carrier and a supplementary uplink (SUL) carrier; msgA-RSRP-Threshold, i.e., the RSRP threshold value for selecting between a UL BWP (BankWidth Part) and a UL BWP (BankWidth Part). When both 2-step random access and 4-step random access are configured in the random access resources in the message Part, the RSRP threshold value for selecting 2-step random access or 4-step random access is used; rsrp-ThresholdMsg3, that is, the RSRP threshold value for determining Msg3 repetition (repeated transmission).

[0065] Optionally, when the first threshold is determined by the terminal device, the first threshold may be directly the second threshold, that is, the terminal device may directly reuse the threshold specified in the relevant protocol (ie, the aforementioned second threshold).

[0066] Optionally, when the first threshold is determined by the terminal device, the first threshold may be calculated based on the second threshold.

[0067] Exemplarily, the aforementioned calculation may be obtained by calculating the second threshold value based on the threshold adjustment coefficient and / or the threshold adjustment offset value. For example, the first threshold value may be equal to the threshold adjustment coefficient multiplied by the second threshold value; or the first threshold value may be equal to the threshold adjustment offset value added to or subtracted from the second threshold value; or the first threshold value may be equal to the result obtained by adding or subtracting the threshold adjustment offset value from the second threshold value, multiplied by the threshold adjustment coefficient; or the first threshold value may be equal to the result obtained by multiplying the second threshold value by the threshold adjustment coefficient, multiplied by or subtracted from the threshold adjustment offset value. The threshold adjustment coefficient may be a positive number greater than or equal to 1, or a positive number less than 1; the threshold adjustment offset value may be greater than or equal to 0, or less than 0.

[0068] The aforementioned threshold adjustment coefficient and / or threshold adjustment offset value may be preset or configured by the network device. If the threshold adjustment coefficient and / or threshold adjustment offset value is preset, it may refer to the threshold adjustment coefficient and / or threshold adjustment offset value being agreed upon by the protocol and pre-stored in the terminal device. In the case where the aforementioned threshold adjustment coefficient and / or threshold adjustment offset value is configured by the network device, it may be carried by one of the following: Feature Combination Preambles; Random Access Channel RACH common configuration parameter (RACH-ConfigCommon); Common configuration parameter of message msg A (MsgA-ConfigCommon); Beam Failure Recovery Configuration (BeamFailureRecoveryConfig); msg A configuration parameter (RACH-ConfigCommonTwoStepRA) in the RACH common configuration parameter. Alternatively, in the case where the aforementioned threshold adjustment coefficient and / or threshold adjustment offset value is configured by the network device, it may be carried by other messages or signaling, such as any one of system messages, DCI, RRC messages, and MAC CE, which are not exhaustively listed here.

[0069] Optionally, if the first information only includes the measurement result of the first downlink signal, the terminal device measures the measurement result of the first downlink signal before initiating random access (that is, before performing the initial PRACH transmission); compares the measurement result of the first downlink signal with the first threshold value, and if the measurement results of the first downlink signal are all less than the first threshold value, it is determined that the first condition is met, and it is determined to perform repeated transmission of PRACH; if there are one or more measurement results of the first downlink signal that are not less than the first threshold value, it is determined not to perform repeated transmission of PRACH. In this case, if it is determined to perform repeated transmission of PRACH, it means that when the PRACH is transmitted for the first time, a repetition transmission method is adopted. If the first information only includes the transmission result of the last transmission of PRACH; after the terminal device has performed a certain PRACH transmission, if it is determined that the transmission result of the last transmission of PRACH is a transmission failure, it is determined that the first condition is met, and it can be determined that the next time the PRACH is retransmitted, the PRACH repetition transmission is performed; otherwise, the PRACH is not retransmitted. In this case, the initial PRACH transmission of the terminal device can be a transmission that does not use repeated transmission. If the first information includes the transmission result of the last PRACH transmission and the measurement result of the first downlink signal, the terminal device measures the measurement result of the first downlink signal before initiating random access (that is, before the initial PRACH transmission); compares the measurement result of the first downlink signal with the first threshold value. If the measurement results of the first downlink signal are all less than the first threshold value, it is determined that the first condition is met and it is determined to perform repeated transmission of PRACH; in this case, it can be determined that repeated transmission of PRACH has been turned on for PRACH transmission, then the terminal device can no longer use the transmission result of the last PRACH transmission for judgment, but maintain repeated transmission of PRACH if PRACH is retransmitted. If the first information includes the transmission result of the last PRACH transmission and the measurement result of the first downlink signal, and the terminal device determines that the measurement results of one or more first downlink signals are not less than the first threshold value, it is determined that repeated transmission of PRACH is not performed when PRACH is transmitted for the first time. Furthermore, after the terminal device transmits PRACH for the first time, if it is determined that the transmission result of the initial transmission of PRACH is a transmission failure, it is determined that the first condition is met, and it can be determined that the repetition transmission of PRACH will be performed starting from the next retransmission of PRACH; otherwise, the repetition transmission of PRACH will not be performed.

[0070] With the above implementation, as long as the terminal device determines that the first condition is satisfied based on the first information, the terminal device determines to perform repeated transmission of the PRACH.

[0071] In some possible implementations, in addition to determining whether to perform repeated transmission of the PRACH based on whether the first information satisfies the first condition, the terminal device may further determine whether to perform repeated transmission of the PRACH based on second information sent by the network device.

[0072] The processing of the network device may also include: the network device sends second information, and the second information is used by the terminal device to determine whether to perform repeated transmission of PRACH; accordingly, the processing of the terminal device also includes: the terminal device receives the second information; the second information is used by the terminal device to determine whether to perform repeated transmission of PRACH. The aforementioned second information is used by the terminal device to determine whether to perform repeated transmission of PRACH, and the second information can be called PRACH repetition indicator information, or PRACH repetition indication field; it should be understood that the second information can also be called other names in actual use, such as PRACH repetition flag (PRACH repetition flag), PRACH repetition enabled (PRACH repetition enable) information, msg1repetition indicator (msg1 repetition indication) information, msg1repetition flag (msg1 repetition flag), msg1repetition enabled (msg1 repetition enable) information, etc., and all possible names are not exhaustively listed here.

[0073] In one example, the network device may explicitly instruct the terminal device whether to perform repeated transmission of the PRACH through the second information.

[0074] The terminal device determines to perform repeated transmission of PRACH when the first information satisfies the first condition, including: the terminal device determines to perform repeated transmission of PRACH when the first information satisfies the first condition, the second information includes first indication information, and the first indication information is used to indicate the start of repeated transmission of PRACH. The second information includes first indication information; wherein, when the value of the first indication information is the first value, it is used to indicate the start of repeated transmission of PRACH; or, when the transmission type of PRACH included in the first indication information is a repeated transmission type, it is used to indicate the start of repeated transmission of PRACH. That is, the first indication information in the aforementioned second information can carry an enable switch or carry the transmission type of PRACH.

[0075] The value of the aforementioned first indication information can represent an enable switch, that is, it can be used to display whether the terminal device turns on the repeated transmission of PRACH. Specifically, when the value of the first indication information is the first value, it is used to indicate that the enable is turned on, that is, it indicates that the repeated transmission of PRACH is turned on; and / or, when the value of the first indication information is the second value, it is used to indicate that the enable is turned off, that is, it indicates that the terminal device does not turn on the repeated transmission of PRACH. Among them, the first value is different from the second value, and the first value and the second value can be pre-configured. For example, the first value can be 0 and the second value can be 1; or, the first value can be 1 and the second value can be 0; or, other first values ​​or other second values ​​can also be set, as long as the first value is different from the second value, they are all within the protection scope of this embodiment. Correspondingly, the processing of the terminal device may specifically include: the terminal device determines to perform repeated transmission of PRACH when the first information satisfies the first condition, the second information includes first indication information, and the value of the first indication information is a first value; and / or, the terminal device determines not to perform repeated transmission of PRACH when the first information satisfies the first condition, the second information includes first indication information, and the value of the first indication information is a second value; and / or, the terminal device determines not to perform repeated transmission of PRACH when the first information does not meet the first condition.

[0076] Alternatively, the first indication information includes a PRACH transmission type; when the PRACH transmission type included in the first indication information is a repeated transmission type, it is used to indicate that the repeated transmission of the PRACH is turned on; when the PRACH transmission type included in the first indication information is a non-repeated transmission type, it is used to indicate that the repeated transmission of the PRACH is not turned on. The repeated transmission type may also be referred to as PRACH repeated transmission, or PRACH repeated transmission type, or msg1 repeated transmission, or msg1 repeated transmission type, etc.; the non-repeated transmission type may also be referred to as: traditional transmission type, or traditional type, or PRACH non-repeated transmission, or PRACH non-repeated transmission type, or msg1 non-repeated transmission, or msg1 non-repeated transmission type, etc., and all possible names are not exhaustively listed here. Accordingly, the processing of the terminal device may specifically include: the terminal device determines to perform repeated transmission of PRACH when the first information satisfies the first condition, the second information includes first indication information, and the transmission type of PRACH included in the first indication information is a repeated transmission type; and / or, the terminal device determines not to perform repeated transmission of PRACH when the first information satisfies the first condition, the second information includes first indication information, and the transmission type of PRACH included in the first indication information is a non-repeated transmission type; and / or, the terminal device determines not to perform repeated transmission of PRACH when the first information does not meet the first condition.

[0077] In one example, the network device may implicitly instruct the terminal device whether to perform repeated transmission of the PRACH through the second information.

[0078] Optionally, the second information does not carry the above-mentioned first indication information, but may carry other relevant configuration information for repeated transmission. The other relevant configuration information for repeated transmission may be a first threshold value. Accordingly, when the first information satisfies the first condition, the terminal device determines to perform repeated transmission of PRACH, including: when the second information includes a first threshold value and the first information satisfies the first condition, the terminal device determines to perform repeated transmission of PRACH; wherein the first threshold value is a threshold value related to the measurement result of the first downlink signal. In this example, the first threshold value may be different from any threshold specified in the relevant protocol, that is, the first threshold value is a threshold value specifically used to determine whether to perform repeated transmission of PRACH. It should be understood that if the second information in this example carries the first threshold value, the network device may use the first threshold value specifically for determining whether to perform repeated transmission of PRACH.

[0079] The second information includes the first threshold value, which may mean that the second information includes the name of the first threshold value and the value of the first threshold value. For example, the second information may include the name of the first threshold value as "dedicated msg1 repeated transmission RSRP threshold value" and the value a1. Alternatively, the second information includes an information field of the first threshold value, and the information field of the first threshold value is used to carry the value of the first threshold value. For example, the second information may include one or more information fields, and the content carried by each information field is pre-defined; assuming that the second information defines information field 1 to carry the "dedicated msg1 repeated transmission RSRP threshold value"; accordingly, the terminal device can determine information field 1 of the "dedicated msg1 repeated transmission RSRP threshold value" according to the definition of each information field of the second information, and then use the content carried in the information field 1 as the value of the "dedicated msg1 repeated transmission RSRP threshold value".

[0080] Optionally, the second information does not carry the first indication information described above, but may carry other configuration information related to repeated transmission. The second information is used to indicate the value of a first parameter, which is used by the terminal device to determine the number of repeated PRACH transmissions. Accordingly, if the first information satisfies the first condition, the terminal device determines to perform repeated PRACH transmissions, including: if the first information satisfies the first condition and the value of the first parameter indicated by the second information is a valid value, the terminal device determines to perform repeated PRACH transmissions; wherein the value of the first parameter is used to determine the number of repeated PRACH transmissions. Here, a valid value of the first parameter may mean that the value of the first parameter is within a valid value range, such as an integer greater than 0 or an integer greater than 1, etc., and all possible situations are not exhaustive here. The second information indicates the value of the first parameter. For example, the first information may include the name of the first parameter and the value of the first parameter, such as a first parameter b and a value of b1. Alternatively, the second information includes an information field for the first parameter, which is used to carry the value of the first parameter. For example, the second information may include one or more information fields, and the content carried by each information field is predefined. Assume that the second information defines information field 2 for carrying the first parameter b. Accordingly, the terminal device can determine the information field 2 corresponding to the first parameter b based on the definitions of the various information fields in the second information, and then use the content carried in the information field 2 as the value b1 of the first parameter b. The first parameter can be referred to as a dedicated PRACH repetition number (Repetition Number of PRACH), or the first parameter can also be referred to as a dedicated preamble repetition number (Repetition Number of Preamble).

[0081] Optionally, the second information may not carry the above-mentioned first indication information, but carries the above-mentioned first threshold value and the value of the first parameter. Accordingly, when the first information satisfies the first condition, the terminal device determines to perform repeated transmission of PRACH, including: when the first information satisfies the first condition, the second information includes the first threshold value, and the value of the first parameter in the second information is a valid value, the terminal device determines to perform repeated transmission of PRACH. Here, the manner in which the second information carries the first threshold value and the value of the first parameter is the same as in the aforementioned embodiment and will not be repeated.

[0082] In one example, the network device may indicate to the terminal device whether to perform repeated transmission of PRACH through the second information display, and may also carry other relevant configuration information of repeated transmission through the second information.

[0083] The second information sent by the network device may include the first indication information; in addition, the second information may also include the value of the above-mentioned first threshold value and / or the first parameter. At this time, the terminal device determines to perform repeated transmission of PRACH when the first information meets the first condition, including: the terminal device determines to perform repeated transmission of PRACH when the first information meets the first condition, the first indication information in the second information indicates to start repeated transmission of PRACH, and the value of the first parameter in the second information is a valid value; or, the terminal device determines to perform repeated transmission of PRACH when the first information meets the first condition, the first indication information in the second information indicates to start repeated transmission of PRACH, and the second information includes the first threshold value; the terminal device determines to perform repeated transmission of PRACH when the first information meets the first condition, the first indication information in the second information indicates to start repeated transmission of PRACH, the value of the first parameter in the second information is a valid value, and the second information includes the first threshold value.

[0084] In some possible implementations, the aforementioned second information may be carried by any one of a variety of information or signaling; illustratively, the second information may be carried by any one of DCI, RRC signaling, MAC CE, system message, etc.

[0085] When the second information is carried by DCI, the DCI may be a first DCI, and the format of the first DCI is DCI format 1_0. In this embodiment, the DCI format 1_0 is carried by the PDCCH (Physical Downlink Control Channel). The aforementioned second information may be carried by the first information field of the first DCI, i.e., DCI format 1_0. The first information field may be a new information field, specifically a new information field obtained by defining one or more bits in the reserved bits.

[0086] In one example, when DCI format 1_0 is used to carry the second information, the DCI format 1_0 needs to meet at least one of the following three conditions: RNTI (Radio Network Temporary Identifier) ​​is used for scrambling; the "Frequency domain resource assignment" field is all "1"; and the Random Access Preamble index field is not all "0". Among them, RNTI can be one of the following: C-RNTI (Cell-RNTI, Cell Radio Network Temporary Identifier), TC-RNTI (Temporary Cell RNTI, Temporary Cell RNTI, CS-RNTI (Configured Scheduling RNTI, Configuration Scheduling RNTI), MCS-C-RNTI (Modulcation Coding Scheme Cell RNTI). In a preferred example, when DCI format 1_0 is used to carry the second information, the aforementioned DCI format 1_0 needs to meet all of the above three conditions. Taking the aforementioned downlink signal as SSB as an example, the reason why DCI format 1_0 needs to meet the above three conditions is explained: If DCI format 1_0 is scrambled using C-RNTI (Cell-Radio Network Temporary Identifier) ​​and the "Frequency domain resource assignment" field is all "1", then DCI format 1_0 is used for the random access process initiated by the PDCCH command. At this time, using the DCI format 1_0 to carry the second information can enable the terminal device to initiate a random access process when receiving the second information, and directly determine whether to perform repeated transmission of PRACH during the random access process. In addition, when the Random Access Preamble index (random access preamble index number) Field is not all "0", the PRACH mask index (mask index number) field is used to indicate the RO associated with the SS / PBCH (ie SSB), and the SS / PBCH index (index number) field is used to determine the SSB. The SSB used by the terminal device and the RO associated with the SSB can enable the terminal device to determine the transmission resources to be used for this PRACH transmission or repeated transmission.

[0087] For the specific composition of DCI format 1_0 carrying the aforementioned second information, please refer to Figure 7, which includes: Field 1, Identifier for DCI format: 1 bit, used to indicate the DCI format; Field 2, Frequency domain resource assignment: used to indicate the frequency domain resource, which occupies x bits; x can be determined according to actual conditions, and can specifically be calculated based on the formula specified in the protocol, and is not limited here; Field 3, Random Access Preamble index: 6 bits, used to explicitly indicate ra-PreambleIndex; Field 4, UL / SUL (supplementary uplink) indicator: 1 bit, if "Random Access Preamble index" is not all 0 and the UE configures SUL in ServingCellConfig, this field indicates which UL carrier is used for PRACH transmission, otherwise, this field is reserved; Field 5, SS / PBCH Index: 6 bits. If the "Random Access Preamble index" is not all zeros, this field indicates the SS / PBCH used to determine the RACH occasion for PRACH transmission. Otherwise, this field is reserved. Field 6, PRACH mask index: 4 bits. If the "Random Access Preamble index" is not all zeros, this field indicates the RACH occasion associated with the SS / PBCH (indicated by the 6-bit SS / PBCH index). Otherwise, this field is reserved. Field 7, Second information: 1 or more bits. Field 8, Reserved bits: The protocol specifies that for operation in a cell with shared spectrum channel access in FR1, or when the DCI format is monitored in the common search space in FR2-2, the reserved bits are 12 bits. Otherwise, the reserved bits are 10 bits.

[0088] In this example, the second information will occupy one or more bits of the reserved bits, so the number of reserved bits can be less than or equal to 11 bits, or the number of reserved bits can be less than or equal to 9 bits. In addition, FIG7 also illustrates an arrangement order of the aforementioned Field 1 to Field 8 in the DCI format 1_0 that carries the second information; FIG7 is only an exemplary illustration. In actual processing, the aforementioned Field 7 can be before Field 8, within Field 8, or after Field 8, all of which are within the protection scope of this embodiment, but are not exhaustive. Alternatively, the second information can be carried by redefining the information field in the aforementioned DCI format 1_0. For example, the first parameter in the second information can be carried by the redefined PRACH mask index field, that is, the PRACH mask index is redefined to carry the first parameter.

[0089] In some embodiments, the second information is carried by DCI, and the DCI may be a second DCI. The format of the second DCI is a DCI format other than DCI format 1_0. The format of the second DCI may be: a DCI format other than DCI format 1_0 in the DCI format specified by the protocol. For example, the format of the second DCI is any one of the following: DCI format 0_0, DCI format 0_1, DCI format 1_1, DCI format 2_1, DCI format 2_2, DCI format 2_3, and the like. In this case, the second DCI may also be carried by the PDCCH, but the function of the second DCI is not to instruct the terminal device to initiate a random access process, and this embodiment does not limit the specific function of the second DCI. The second information may be carried by a designated information field of the second DCI, and the designated information field may occupy one or more bits of the reserved bits of the second DCI. In another example: the format of the second DCI may be a newly defined DCI format. The newly defined DCI format is different from the DCI format specified in the aforementioned protocol. In this case, the second DCI may be dedicated to indicating whether the terminal device performs repeated transmission of the PRACH. The second information may be carried by a designated information field of the second DCI, and the number of bits occupied may be one or more.

[0090] In some implementations, the second information is carried by RRC signaling. The RRC signaling may be RRC signaling in any processing flow, such as RRC connection establishment signaling, RRC connection reconfiguration completion signaling, etc., and all possible situations are not exhaustively listed here.

[0091] Through the above embodiments, the terminal device can use only the first information to determine whether to perform repeated transmission of PRACH; or the terminal device can jointly determine whether to perform repeated transmission of PRACH based on the first information and the second information configured by the network device. Furthermore, the processing of the terminal device may also include: in the case of determining to perform repeated transmission of PRACH, the terminal device performs repeated transmission of PRACH on multiple target transmission resources; wherein, the number of the multiple target transmission resources is the same as the number of repeated transmissions of PRACH, and each target transmission resource in the multiple target transmission resources is used to perform one PRACH transmission. Correspondingly, the processing of the network device may also include: the network device receives repeatedly transmitted PRACH on multiple target transmission resources; wherein, the number of the multiple target transmission resources is the same as the number of repeated transmissions of PRACH, and each target transmission resource in the multiple target transmission resources is used to receive one PRACH.

[0092] In addition, if the terminal device determines not to perform repeated PRACH transmission, the terminal device performs PRACH transmission on a selected transmission resource. Accordingly, the network device may further include: the network device receives PRACH. The transmission resource selected by the terminal device may be a transmission resource selected according to existing protocol provisions, and will not be further described.

[0093] The aforementioned transmission resource may specifically refer to a PRACH opportunity; the PRACH opportunity may be a time-frequency resource, and the PRACH opportunity may also be referred to as an RO. It should be understood that in the following description of this disclosure, unless otherwise specified, transmission resource and RO have the same meaning, target transmission resource and target RO have the same meaning, and available transmission resource and available RO have the same meaning.

[0094] Since this embodiment describes how the terminal device and the network device specifically determine the number of PRACH retransmissions and how the terminal device and the network device specifically determine multiple target transmission resources, the description will be based on M second downlink signals. The above-mentioned M second downlink signals refer to the downlink signals used by the terminal device. Therefore, the M second downlink signals are first described:

[0095] Optionally, the above-mentioned M second downlink signals are specified by the network device for the terminal device. The M second downlink signals are indicated by the fifth information. The M second downlink signals are indicated by the network device through the fifth information. The fifth information may carry the index numbers (or numbers, or identifiers) of the M second downlink signals. Specifically: the network device sends the fifth information. Correspondingly, the terminal device receives the fifth information and determines the M second downlink signals based on the fifth information. The fifth information may be carried by any one of DCI, RRC signaling, MAC CE, system message, etc. In the case where the fifth information is carried by DCI, the fifth information is carried by the first DCI; the definition of the first DCI has been explained in the aforementioned embodiment and will not be repeated here. For example, if the second downlink signal is the second SSB, the fifth information may be the SS / PBCH index carried by Field 5 in the aforementioned first DCI. The relevant description of the SS / PBCH index is the same as that in the aforementioned embodiment and will not be repeated here.

[0096] Optionally, the M second downlink signals are determined by the terminal device. The processing of the terminal device may also include: the terminal device selects the M second downlink signals from the multiple downlink signals based on the measurement results corresponding to the multiple downlink signals. Here, M is configured by the network device or preset. For example, the network device can specify M for the terminal device; or, the network device and the terminal device can preset the same number M respectively. The M can be 1, or can be an integer greater than 1, and all possible values ​​thereof are not limited here. The M second downlink signals here may be the same as or different from the aforementioned first downlink signal.

[0097] Selecting M second downlink signals from the multiple downlink signals includes one of the following: randomly selecting M downlink signals from all downlink signals as the M second downlink signals; selecting M second downlink signals with the largest measurement results from the multiple downlink signals; and determining M second downlink signals based on the downlink signals with measurement results greater than the first threshold value when there is a downlink signal with a measurement result greater than the first threshold value among the multiple downlink signals. That is, the terminal device can randomly select M second downlink signals from all downlink signals. Alternatively, regardless of whether the measurement results of each downlink signal are greater than the first threshold value, only the M second downlink signals with the largest measurement results can be selected from them. Alternatively, considering whether the measurement results of each downlink signal are greater than the first threshold value, the second downlink signal can be selected from the downlink signals with measurement results greater than the first threshold value as much as possible.

[0098] Among them, the determining of M second downlink signals based on the downlink signal whose measurement result is greater than the first threshold value includes one of the following: when the number of downlink signals whose measurement results are greater than the first threshold value is not less than M, selecting M second downlink signals from the downlink signals whose measurement results are greater than the first threshold value; when the number of downlink signals whose measurement results are greater than the first threshold value is less than M, using the downlink signals whose measurement results are greater than the first threshold value and part of the downlink signals among the downlink signals whose measurement results are not greater than the first threshold value as the M second downlink signals.

[0099] Specifically, in the process of considering whether the measurement results of each downlink signal are greater than the first threshold value, there may be a situation where the number K of downlink signals whose measurement results are greater than the first threshold value is equal to M. In this case, the terminal device can use all downlink signals whose measurement results are greater than the first threshold value as M second downlink signals. For example, there may be a situation where the number K of downlink signals whose measurement results are greater than the first threshold value is greater than M. In this case, the terminal device can randomly select M second downlink signals from the downlink signals whose measurement results are greater than the first threshold value, or can also select the M second downlink signals with the largest measurement results. For example, there may be a situation where the number K of downlink signals whose measurement results are greater than the first threshold value is less than M. In this case, the terminal device can use all K downlink signals greater than the first threshold value as K second downlink signals, and then select MK second downlink signals with the largest measurement results from the remaining downlink signals whose measurement results are not greater than the first threshold value.

[0100] It should be noted that the aforementioned M can also be referred to as the number of downlink signal selections in some examples; for example, if the downlink signal is SSB, the M can also be expressed as "SSB_selected_number (SSB selected number)".

[0101] Next, a detailed description is given of how the terminal device and the network device specifically determine the number of repeated transmissions of the PRACH and how the terminal device and the network device specifically determine multiple target transmission resources.

[0102] In a possible implementation manner, the number of repeated transmissions of the PRACH is related to a second parameter, where the second parameter is used to indicate the number of downlink signals associated with one transmission resource.

[0103] First of all, it should be noted that the aforementioned terminal device only uses the first information to determine the repeated transmission of PRACH, or when the aforementioned terminal device uses the first information and the second information to jointly determine the repeated transmission of PRACH and the second information does not include the first parameter, the terminal device can use the second parameter to determine the number of repeated transmissions of PRACH.

[0104] Exemplarily, if the downlink signal is SSB, the second parameter may be SSB_per_RO in the aforementioned embodiment. The SSB_per_RO can be expressed as ssb-perRACH-Occasion when configured in the system, and can be specifically carried by any one of the following information: carried by a parameter configured by a high-level layer, and the parameter configured by the high-level layer can be specifically ssb-perRACH-OccasionAndCB-PreamblesPerSSB (the number of SSBs associated with an RO, and the number of preambles based on contention for each SSB on each valid RO); carried by msgA in two-step random access, and the parameter specifically carried by msgA can be expressed as msgA-SSB-PerRACH-OccasionAndCB-PreamblesSSB (the number of SSBs associated with an RO in msgA, and the number of preambles based on contention for each SSB on each valid RO); ssb-perRACH-Occasion carried in the configuration message of non-contention-based random access (CFRA); ssb-PerRACH-OccasionTwoStepRA (2-step random access) carried in the configuration message of CFRA; SI (System Message, System The ssb-perRACH-Occasion carried in Information)-RequestConfig (request configuration); the ssb-perRACH-Occasion carried in BeamFailureRecoveryConfig (beam failure recovery configuration). It should be noted that when the aforementioned SSB-per-RO is configured through any one of the aforementioned information, the value of the SSB-per-RO can be configured as {oneEighth(1 / 8), oneFourth(1 / 4), oneHalf(1 / 2), one, two, four, eight, sixteen}. In the case where the downlink signal is other types of downlink signals, such as the downlink signal is CSI-RS, the second parameter may be expressed as CSI-RS_per_RO, etc., and the second parameters corresponding to various types of downlink signals are not exhaustively enumerated here.

[0105] The second parameter can be a positive number, for example, the second parameter can be less than 1, or can be not less than 1. When the second parameter is not less than 1, the number of downlink signals associated with any transmission resource in a mapping cycle is not less than 1; that is, within a mapping cycle, one or more downlink signals can be mapped to the same transmission resource. When the second parameter is less than 1, the number of downlink signals associated with any transmission resource in a mapping cycle is less than 1, that is, within a mapping cycle, one downlink signal can be mapped to multiple transmission resources, and different downlink signals are mapped to different transmission resources.

[0106] The aforementioned mapping cycle can be expressed as a mapping cycle, or, in some possible cases, the mapping cycle can be called an RO mapping cycle. The aforementioned mapping cycle may include: transmission resources for mapping multiple downlink signals. The multiple downlink signals include M second downlink signals. The multiple downlink signals may refer to all downlink signals (which may be all configured downlink signals, or all downlink signals actually used in communication), that is, all downlink signals in the system; accordingly, a mapping cycle may include all transmission resources for mapping all downlink signals, and each transmission resource in the total transmission resources is used to map one or more downlink signals. The M second downlink signals may refer to downlink signals used by the terminal device.

[0107] It should be understood that the number of transmission resources included in a mapping cycle is related to the number of all downlink signals and the aforementioned second parameter. Taking the downlink signal as SSB and the second parameter as SSB_per_RO (assuming that SSB-per-RO is expressed as N) as an example, the number of transmission resources included in a mapping cycle can be determined by multiplying the inverse of SSB_per_RO by the number of all SSBs. When the value of N is less than 1, each SSB can be associated with 1 / N ROs; for example, in FIG4 , part 402 of FIG4 has SSB_per_RO=1 / 2, 1 SSB is mapped to 2 consecutive ROs, and the number of all SSBs is 8, so 16 ROs can be included in a mapping cycle. When the value of N is not less than 1, each SSB can only be associated with 1 RO; for example, in part 403 of FIG4 , SSB_per_RO=1, each RO is used to map 1 SSB, and the number of all SSBs is 8, so 8 ROs can be included in a mapping cycle. In section 404 of Figure 4 , SSB_per_RO = 2, each RO is used to map two SSBs, and the total number of SSBs is equal to 8. Therefore, a mapping cycle can include four ROs. The above is only an example and does not exhaust all possible situations. It should be noted that in a mapping cycle, the arrangement of ROs can be arranged from low frequency to high frequency in the frequency domain and in chronological order in the time domain. With reference to Figure 4 , in a mapping cycle, the arrangement of ROs can be from bottom to top and from left to right.

[0108] In some possible implementations, the second parameter is not less than 1.

[0109] When the second parameter is not less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a first value, which is equal to M multiplied by the second parameter; where M is the number of second downlink signals, and M is a positive integer; a second value, which is equal to M multiplied by a first preset value.

[0110] In one example, when the second parameter is not less than 1, the number of repeated transmissions of the PRACH is equal to a first value, and the first value is equal to M multiplied by the second parameter; wherein M is the number of second downlink signals, and M is a positive integer. Specifically, when the second parameter is equal to 1 and M is also equal to 1, the terminal device can determine that the number of repeated transmissions of the PRACH can be equal to 1, that is, it can be determined that the repeated transmission of the PRACH is not performed at this time. When either the second parameter or M is greater than 1, the terminal device can determine that the number of repeated transmissions of the PRACH can be equal to the second parameter multiplied by M. For example, if the second downlink signal is the second SSB, assuming that the second parameter is SSB-per-RO, and the value of the SSB-per-RO is expressed as N, then the number of repeated transmissions of the PRACH can be SSB_selected_number*N; the description of SSB_selected_number has been described in the previous embodiment and will not be repeated here.

[0111] In another example, when the second parameter is not less than 1, the number of repeated transmissions of the PRACH is equal to a second value, and the second value is equal to M multiplied by a first preset value. The first preset value can be set according to actual conditions, and the first preset value can be 4, 8, or more or less, and they are not exhaustively listed here. The first preset value can be pre-configured by both the terminal device and the network device, or can be pre-sent by the network device to the terminal device. The setting method of the first preset value is not limited here. As long as both the terminal device and the network device are set with the same first preset value, they are all within the protection scope of this embodiment. For example, if the second downlink signal is the second SSB, assuming that the second parameter is SSB-per-RO, and the value of SSB-per-RO is expressed as N, then the number of repeated transmissions of the PRACH can be SSB_selected_number*first preset value; the description of SSB_selected_number has been described in the previous embodiment and will not be repeated here.

[0112] It should be noted that, in actual use, any one of the above examples in which the second parameter is not less than 1 can be specified, or the terminal device and the network device can negotiate to use any one of them. As long as the terminal device and the network device determine the number of repeated transmissions of the PRACH in the same way, they are all within the scope of protection of this embodiment.

[0113] When the second parameter is not less than 1, the terminal device determines a plurality of target transmission resources for repeated transmission of the PRACH as follows:

[0114] In the first manner, the multiple target transmission resources include: multiple transmission resources that are continuous within one or more mapping cycles. It should be noted that the one or more mapping cycles are continuous one or more mapping cycles. Here, among the multiple transmission resources that are continuous within the one or more mapping cycles, regardless of whether the multiple transmission resources are associated with any one of the M second downlink signals, they can be used for repeated transmission of PRACH. In this embodiment, since the second parameter is not less than 1, a downlink signal is mapped to only one transmission resource in one mapping cycle, and one or more downlink signals may be mapped to the same transmission resource.

[0115] The starting target transmission resource of the above-mentioned multiple target transmission resources may be: the first second available transmission resource in the first mapping cycle. Specifically, the first second available transmission resource in the first mapping cycle may be: the second available transmission resource associated with the second downlink signal with the smallest index number among the M second downlink signals in the first mapping cycle. The first mapping cycle may refer to the first mapping cycle of the terminal device after entering the random access process; the definition of the mapping cycle has been explained in the above-mentioned embodiment and will not be repeated here. The method for determining the starting target transmission resource of the above-mentioned multiple target transmission resources may include: determining the second available transmission resources associated with the M second downlink signals in the first mapping cycle; taking the second downlink signal with the smallest index number among the M second downlink signals as the first second downlink signal, and taking the only second available transmission resource associated with the first second downlink signal as the starting target transmission resource of the multiple target transmission resources. The above-mentioned M second downlink signals may be associated with their respective index numbers, and the index number may also be called any one of an identifier, a number, etc. As long as it can be used to uniquely identify each downlink signal, it is within the protection scope of this embodiment.

[0116] In the first mapping cycle, the second available transmission resources associated with the M second downlink signals are respectively determined based on the second parameter when the second parameter is not less than 1. Specifically, when the second parameter is not less than 1, the number of downlink signals associated with one transmission resource in the first mapping cycle is determined based on the second parameter; the transmission resource associated with each downlink signal in the first mapping cycle is determined based on the number of downlink signals associated with the one transmission resource; and one second available transmission resource associated with each second downlink signal in the first mapping cycle is determined based on the index numbers of the M second downlink signals. Taking the first second downlink signal as the first second SSB, and the second parameter SSB_per_RO as an example, combined with part 801 of Figure 8: there are 8 SSBs in total, and the second parameter SSB_per_RO=8, that is, one RO can map 8 SSBs, all SSBs are mapped to the same RO, and each RO is a mapping cycle; assuming that the index number of the first second SSB is 6, RO 8011 is the first mapping cycle, then the second available RO associated with the first second SSB is RO 8011, and RO8011 is the starting target RO among multiple target ROs. For example, with reference to section 802 of FIG8 , there are 8 SSBs in total, and SSB_per_RO = 2, meaning one RO can map two SSBs. Thus, one mapping cycle includes four ROs at one time-domain location. For example, 8021 in FIG8 indicates one mapping cycle. Assuming the index number of the first second SSB is 6, and mapping cycle 8021 is the first mapping cycle, RO 8022 is the second available RO associated with the first second SSB. RO 8022 is the starting target RO among the multiple target ROs. The above is merely an example and does not exhaust all possible scenarios.

[0117] Optionally, when the terminal device performs repeated transmission of PRACH, the PRACH carries a first type of preamble code; the first type of preamble code is a preamble code used when performing repeated transmission of PRACH; the first type of preamble code is preset or configured by the network device.

[0118] Here, it should be noted that PRACH will also carry a preamble when no repeated transmission is performed, but the preamble it needs to carry is determined in the manner specified in the relevant protocol. For example, NR defines two types of preambles: long preambles and short preambles. In some related protocols, the preamble sequence for random access supports two preamble lengths: a long preamble based on a length of L = 839 and a short preamble based on a length of L = 139. This is illustrated in conjunction with the following Tables 2 and 3:

[0119] Preamble format length Subcarrier spacing Supported restriction set Type 0 839 1.25kHz Type A, Type B 1 839 1.25kHz Type A, Type B 2 839 1.25kHz Type A, Type B 3 839 5kHz Type A, Type B

[0120] Table 2

[0121]

[0122] Table 3

[0123] In some relevant protocols, as shown in Table 2, two new short preamble lengths are introduced: L = 1151 and L = 571. The long preamble with L = 839 supports PRACH subcarrier spacings of 1.25 kHz and 5 kHz; the short preamble with L = 139 supports PRACH subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, and 120 kHz. The short preambles with L = 1151 and 571 support PRACH subcarrier spacings of 15 kHz and 30 kHz. Long preambles are only used in NR licensed spectrum and support both unrestricted and restricted sets, which can include type A and type B. Short preambles only support unrestricted sets. As shown in Table 3, the short preamble with a sequence length of 139 can be used for both licensed and unlicensed spectrum; the short preamble with a sequence length of 1151 and 571 can only be used in the shared spectrum channel access scenario. In the above Table 3, only the preamble format A1 is exemplified. The actual protocol also includes other types of formats, which are not listed here exhaustively. In Table 3, μ represents the subcarrier spacing configuration, and the value can be 0, 1, 2, 3, etc., without limitation. The terminal device can select the preamble to be used according to the current scenario. This embodiment does not limit all possible situations.

[0124] In the case where the first type of preamble is preset, it is preset in both the terminal device and the network device. In the case where the first type of preamble is configured for the network device, the processing of the network device may further include: the network device sends sixth information to the terminal device, and the sixth information includes the first type of preamble. Accordingly, the terminal device can receive the sixth information. The number of first type preambles can be one or more, that is, one or more first type preambles can constitute a first type preamble subset; the terminal device can select any one of the one or more first type preambles as the first type preamble carried during the repeated transmission of this PRACH. Alternatively, different first type preambles are associated with different scenarios; the terminal device selects a first type preamble from one or more first type preambles based on the current scenario as the first type preamble carried during the repeated transmission of this PRACH. Among them, the scenarios may include macro cell coverage, super large cell coverage, etc., which are not exhaustively listed here.

[0125] In this embodiment, the second parameter is not less than 1, and the multiple target transmission resources are multiple transmission resources that are continuous within one or more mapping cycles. The network device receives the PRACH, specifically including: the network device receives the PRACH sent by the terminal device, and parses the preamble carried in the PRACH; when the preamble carried by the PRACH is a first-type preamble, the network device determines that the terminal device repeatedly transmits the PRACH, and the network device receives the PRACH repeatedly transmitted by the terminal device on the multiple target transmission resources.

[0126] Specifically, regardless of whether the M second downlink signals are indicated by the network device or determined by the terminal device, the way in which the network device determines whether the terminal device performs repeated transmission of PRACH can be: when the network device receives the PRACH sent by the terminal device, the network device parses the preamble code carried in the PRACH; when it is determined that the preamble code carried by the PRACH is a first-type preamble code, the network device determines that the terminal device performs repeated transmission of PRACH.

[0127] After the network device determines that the terminal device performs repeated transmission of PRACH, the network device can further determine the number of repeated transmissions of PRACH and the target transmission resource. In the case where M second downlink signals are indicated by the network device, the network device determines the number of repeated transmissions of PRACH and the target transmission resource in the same manner as the terminal device, and no repeated explanation is given. In the case where M second downlink signals are determined by the terminal device, the network device determines the number of repeated transmissions of PRACH in the same manner as the aforementioned terminal device, and no repeated explanation is given. The way in which the network device determines the target transmission resource may be: the network device may use the first currently parsed transmission resource for transmitting PRACH as the target starting transmission resource; and then the network device receives and demodulates the PRACH on the aforementioned number of repeated transmissions consecutive transmission resources on and after the target starting transmission resource based on the determined number of repeated transmissions of PRACH.

[0128] Taking the first second downlink signal as the first second SSB and the second parameter, namely SSB_per_RO, as an example, combined with part 901 of Figure 9, for example: SSB_per_RO = 1, one mapping cycle includes 8 ROs, the number of repeated transmissions of PRACH is equal to 8, the first second SSB is SSB1, and the starting target RO of multiple target ROs is the only second available RO associated with SSB1, namely RO 9011 in Figure 9; the multiple target ROs 9012 include: in the first mapping cycle, the RO 9011 and the subsequent 7 consecutive ROs. Taking part 902 of FIG. 9 as an example, SSB_per_RO = 2, a mapping cycle includes 4 ROs, the number of PRACH retransmissions is 8, the first second SSB is SSB 5, and the starting target RO of the multiple target ROs is the second available RO associated with SSB 5, i.e., RO 9021 in FIG. 9 ; the multiple target ROs 9022 include RO 9021 and the seven consecutive ROs thereafter within the first mapping cycle. The above is merely an example and does not exhaust all possible situations.

[0129] The second method, the multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in one or more mapping cycles; wherein, each second available transmission resource in the one or more second available transmission resources is associated with one or more second downlink signals in M ​​second downlink signals.

[0130] The one or more second available transmission resources in each mapping cycle include: a second available transmission resource associated with each second downlink signal in the M second downlink signals in each mapping cycle; wherein, the second available transmission resource associated with each second downlink signal is determined based on the second parameter when the second parameter is not less than 1. Specifically, the method for determining the one or more second available transmission resources in each mapping cycle may include: determining the number of downlink signals associated with one transmission resource based on the second parameter when the second parameter is not less than 1; determining the transmission resource associated with each downlink signal in a mapping cycle based on the number of downlink signals associated with the one transmission resource; determining a second available transmission resource associated with each second downlink signal in a mapping cycle based on the index numbers of the M second downlink signals; and taking a set of the second available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle as the one or more second available transmission resources in each mapping cycle.

[0131] In this method, the method for determining the starting target transmission resource of multiple target transmission resources is the same as the above method and will not be repeated.

[0132] Optionally, when the terminal device performs repeated transmission of the PRACH, the PRACH carries a first type of preamble. The description of the first type of preamble is the same as that in the previous embodiment and is not repeated here. In this embodiment, regardless of whether the M second downlink signals are indicated by the network device or determined by the terminal device, the manner in which the network device determines that the terminal device performs repeated transmission of the PRACH can be the same as that in the previous embodiment and is not repeated here.

[0133] After the network device determines that the terminal device is performing repeated transmission of the PRACH, it can further determine the number of repeated transmissions of the PRACH and the target transmission resource. In the case where the M second downlink signals are indicated by the network device, the network device determines the number of repeated transmissions of the PRACH and the target transmission resource in the same manner as the terminal device, and no repeated explanation is given. In the case where the M second downlink signals are determined by the terminal device, the network device determines the number of repeated transmissions of the PRACH in the same manner as the aforementioned processing method of the terminal device, and no repeated explanation is given.

[0134] There are several different ways for the network device to determine the target transmission resource. Specifically, when there is only one transmission resource in a mapping cycle, that is, when the one transmission resource is associated with all downlink signals, the network device can use the first transmission resource currently parsed for transmitting PRACH as the target starting transmission resource; then, based on the determined number of repeated transmissions of PRACH, the network device receives and demodulates the PRACH on the consecutive transmission resources with the aforementioned number of repeated transmissions at and after the target starting transmission resource. In the case where there are multiple transmission resources in a mapping cycle, that is, a transmission resource is associated with part of the downlink signals in all downlink signals, the network device can receive the content corresponding to all transmission resources in a mapping cycle, analyze whether there is a PRACH carrying the first type of preamble code on each transmission resource, and use the transmission resources occupied by the PRACH carrying the first type of preamble code in a mapping cycle as one or more second available transmission resources occupied by the terminal device in the mapping cycle; combined with the position of one or more second available transmission resources determined by the network device in a mapping cycle, and the number of repeated transmissions of the PRACH determined by the aforementioned network device, the network device can determine the second available transmission resource of each mapping cycle in one or more mapping cycles, and use the one or more second available transmission resources of each mapping cycle in the one or more mapping cycles as the target transmission resource. After the network device determines the target transmission resource, it can perform demodulation processing based on the repeatedly transmitted PRACH received on the target transmission resource. The specific processing method is not limited in this embodiment.

[0135] Taking M second downlink signals as M second SSBs, and the second parameter, namely SSB_per_RO, as an example, combined with part 1010 of Figure 10, for example: SSB_per_RO = 2, one mapping cycle includes 4 ROs, the number of repeated transmissions of PRACH is equal to 4, and the M second SSBs are SSB 5 and SSB7 respectively; the second available transmission resources associated with SSB 5 and SSB7 are the third RO and the fourth RO in a mapping cycle; then the starting target RO among the multiple target ROs is the third RO in the first mapping cycle, namely RO1011, and the multiple target ROs 1012 include: starting from the starting target RO in the first mapping cycle (including the starting target RO), the fourth RO, the third RO and the fourth RO in the second mapping cycle. For example, with reference to section 1020 of FIG. 10 , if SSB_per_RO = 8, a mapping cycle includes only one RO, the number of PRACH retransmissions is 8, the M second SSBs are SSB1, SSB2, and SSB3, and the second available transmission resource associated with SSB1, SSB2, and SSB3 is the unique RO within the mapping cycle. The starting target RO among the multiple target ROs is RO 1021 within the first mapping cycle, and the multiple target ROs 1022 include the eight ROs in mapping cycles 1 to 8. The above is merely an example and does not exhaust all possible scenarios.

[0136] In some possible implementations, the second parameter is less than 1. When the second parameter is less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a third value; the third value is the sum of the number of one or more first available transmission resources associated with M second downlink signals in a mapping cycle; where M is a positive integer; a fourth value; the fourth value is equal to M multiplied by the second preset value.

[0137] The number of repeated transmissions of the PRACH is equal to a third value; the third value is the sum of the number of one or more first available transmission resources associated with M second downlink signals in a mapping cycle; wherein M is a positive integer.

[0138] The network device may not indicate one or more first available transmission resources associated with the M second downlink signals respectively, then the terminal device may use all available transmission resources associated with the M second downlink signals respectively as first available transmission resources. In this case, the number of all first available transmission resources associated with each second downlink signal is equal to the inverse of the second parameter, and the first available transmission resources associated with different second downlink signals are different; if the second parameter is expressed as N, the number of all first available transmission resources associated with each second downlink signal in a mapping cycle is equal to 1 / N, and the third value is equal to M multiplied by 1 / N. For example, if the second downlink signal is the second SSB, assuming that the second parameter is SSB-per-RO, and the value of SSB-per-RO is expressed as N, then the number of repeated transmissions of the PRACH can be SSB_selected_number*(1 / N).

[0139] Alternatively, the network device can indicate one or more first available transmission resources associated with the M second downlink signals respectively, and the terminal device can determine the one or more first available transmission resources associated with the M second downlink signals respectively within a mapping cycle according to the indication of the network device. In this case, the number of all first available transmission resources associated with each second downlink signal within a mapping cycle may be less than or equal to the inverse of the second parameter, the first available transmission resources associated with different second downlink signals are different, and the number of first available transmission resources associated with different second downlink signals may be the same or different. Therefore, the third numerical value is the sum of the number of one or more first available transmission resources associated with the M second downlink signals respectively within a mapping cycle.

[0140] Alternatively, the number of repeated transmissions of the PRACH is equal to a fourth value; the fourth value is equal to M multiplied by a second preset value. The second preset value can be set based on actual conditions and can be 2, 4, 8, or a larger or smaller value, which is not exhaustive here. Here, the second preset value and the first preset value can be the same or different, and are all within the scope of protection of this embodiment. It should be understood that the second preset value needs to be pre-set on both the terminal device and the network device. For example, an administrator may configure the second preset value on the terminal device and the network device respectively. In another example, the network device may determine the second preset value according to a protocol and transmit it to the terminal device via a system broadcast or other information, so that the terminal device can pre-acquire and save the second preset value. For example, if the second downlink signal is a second SSB, assuming the second parameter is SSB-per-RO, and the value of SSB-per-RO is represented by N, then the number of repeated transmissions of the PRACH can be SSB_selected_number * the second preset value.

[0141] Alternatively, the number of repeated transmissions of the PRACH is equal to the minimum of the third value and the fourth value. That is, the number of repeated transmissions of the PRACH = min{third value, fourth value}. For example, if the second downlink signal is the second SSB, assuming that the second parameter is SSB-per-RO, the value of the SSB-per-RO is expressed as N, the third value is equal to SSB_selected_number*(1 / N), and the fourth value is equal to SSB_selected_number*second preset value. The number of repeated transmissions of the PRACH can be min{SSB_selected_number*(1 / N),SSB_selected_number*second preset value}.

[0142] It should be noted that, when the above-mentioned examples of the second parameter being less than 1 are actually used, any one of them can be specified or negotiated in advance in the terminal device and the network device respectively. As long as the terminal device and the network device determine the number of repeated transmissions of PRACH in the same way, they are all within the protection scope of this embodiment. In the aforementioned description of determining the number of repeated transmissions of PRACH, it may be necessary to determine the third value in combination with the number of one or more first available transmission resources associated with each of the M second downlink signals in a mapping cycle. First, the method for determining the one or more first available transmission resources associated with each of the M second downlink signals in the aforementioned mapping cycle is explained:

[0143] When the second parameter is less than 1, the one or more first available transmission resources associated with each of the M second downlink signals in a mapping cycle include one of the following: one or more available transmission resources associated with each of the M second downlink signals in the mapping cycle; designated transmission resources associated with each of the M second downlink signals in the mapping cycle; available transmission resources in a subset of transmission resources associated with each of the M second downlink signals in the mapping cycle; available transmission resources between the starting available transmission resource and the ending available transmission resource associated with each of the M second downlink signals in the mapping cycle; wherein, the starting available transmission resource and / or the ending available transmission resource associated with each second downlink signal is the designated transmission resource associated with each second downlink signal.

[0144] Optionally, when the second parameter is less than 1, the one or more first available transmission resources associated with each of the M second downlink signals in a mapping cycle include: one or more available transmission resources associated with each of the M second downlink signals in the one mapping cycle.

[0145] In one case, the one or more available transmission resources associated with each second downlink signal in a mapping cycle can be determined by the terminal device based solely on the second parameter, without combining with other information sent by the network device. Specifically, the one or more available transmission resources associated with each second downlink signal in a mapping cycle can be determined based on the second parameter and the index number of each second downlink signal. For example, the processing of the terminal device may include: when the second parameter is less than 1, determining the number of transmission resources associated with a downlink signal based on the second parameter; determining the multiple available transmission resources associated with each downlink signal in a mapping cycle based on the number of transmission resources associated with a downlink signal. Further, the terminal device may determine the one or more available transmission resources associated with each second downlink signal in a mapping cycle based on the index number of each second downlink signal and the multiple available transmission resources associated with each downlink signal in a mapping cycle; and use the one or more available transmission resources associated with each second downlink signal in a mapping cycle as the one or more first available transmission resources associated with each second downlink signal in the mapping cycle.

[0146] In another case, the one or more available transmission resources associated with each second downlink signal in a mapping cycle may be determined based on the fourth information sent by the network device. The processing of the network device may include: the network device sends the fourth information, wherein the fourth information is used by the terminal device to determine the one or more available transmission resources associated with each of the M second downlink signals in a mapping cycle when the second parameter is less than 1. Accordingly, the processing of the terminal device may also include: the terminal device receives the fourth information, wherein the fourth information is used to determine the one or more available transmission resources associated with each of the M second downlink signals in a mapping cycle when the second parameter is less than 1. For example, M second downlink signals are M second SSBs; when the value of the aforementioned second parameter (SSB-per-RO) N is less than 1, each SSB can be associated with 1 / N ROs, but not all ROs associated with each SSB may be used to send PRACH; in this case, the network device will further indicate to the terminal device through the fourth information one or more available PRACH occasions (ROs) associated with each second SSB in the M second SSBs; the one or more available ROs associated with each second SSB are at least part of the 1 / N ROs associated with each second SSB.

[0147] Optionally, the fourth information may include second indication information, and the second indication information includes one or more available transmission resources associated with each downlink signal in all downlink signals within a mapping cycle. For example, the fourth information includes: relevant information of each downlink signal, and index numbers corresponding to the one or more available transmission resources associated with the downlink signal. After receiving the fourth information, the terminal device can determine the one or more available transmission resources associated with each of the M second downlink signals from the fourth information based on the relevant information corresponding to the M second downlink signals. Here, the relevant information of each downlink signal can be the number, identification, ID, index number, etc. of the downlink signal.

[0148] Optionally, the fourth information includes a bit map; the bit map is used to indicate one or more available transmission resources associated with each of the M second downlink signals in a mapping cycle.

[0149] Specifically, the bitmap is used to indicate one or more available transmission resources associated with each downlink signal in a mapping cycle, wherein the multiple downlink signals include the M second downlink signals. The bitmap may specifically include sub-bitmaps corresponding to the multiple downlink signals. The number of bits included in the sub-bitmap corresponding to each downlink signal may be equal to the number of transmission resources included in a mapping cycle. Each downlink signal corresponds to a sub-bitmap, and each bit may correspond to a transmission resource. The value of each bit is used to indicate whether the transmission resource at the corresponding position is an available transmission resource for the downlink signal. When the value of a bit is a first specified value, it indicates that the transmission resource at the corresponding position is an available transmission resource for the downlink signal. When the value of a bit is a second specified value, it indicates that the transmission resource at the corresponding position is not an available transmission resource for the downlink signal. Here, the first specified value and the second specified value are different. The first specified value is 0 and the second specified value is 1, or the first specified value is 1 and the second specified value is 0. Alternatively, other specified values ​​may be set. These are not exhaustive here, as long as both the terminal device and the network device use the same value meaning. After receiving the fourth information, the terminal device may perform the following processing: based on the fourth information, the terminal device determines the i-th sub-bitmap associated with the i-th second downlink signal among the M second downlink signals, and uses the transmission resource corresponding to the position where the bit value in the i-th sub-bitmap is the first specified value as the available transmission resource associated with the i-th second downlink signal. Wherein, i is a positive integer less than or equal to M.

[0150] Alternatively, the bitmap is a total bitmap. Since the transmission resources associated with different downlink signals are different when the second parameter is less than 1, the number of bits included in the bitmap can be configured to be equal to the number of transmission resources included in a mapping cycle, and only the value of each bit in the bitmap is used to indicate whether the transmission resource at that position in a mapping cycle is an available transmission resource. After receiving the fourth information, the terminal device can perform the following processing: based on the one or more transmission resources associated with the i-th second downlink signal among the M second downlink signals, the terminal device determines the one or more bits at the corresponding positions of the one or more transmission resources in the bitmap included in the fourth information; and uses the transmission resource corresponding to the position where the value of the one or more bits is the first specified value as the available transmission resource associated with the i-th second downlink signal. For example, there are a total of 8 downlink signals, a mapping cycle includes 16 transmission resources, and the bitmap has a total of 16 bits. Assuming that the values ​​of the even-numbered bits are set to the first specified value, and the values ​​of the remaining bits are set to the second specified value, it can be said that each downlink signal is configured with an available transmission resource; if the i-th second downlink signal is the first downlink signal among all downlink signals, then the second transmission resource in a mapping cycle can be determined as the available transmission resource of the i-th second downlink signal. Here, the i-th second downlink signal is any one of the M second downlink signals. Only the i-th second downlink signal is used as an example for explanation. The processing of each second downlink signal in the actual M second downlink signals is the same as that of the i-th second downlink signal, and they are not described one by one.

[0151] It should be understood that, in the above-mentioned processing of determining one or more first available transmission resources associated with each of the M second downlink signals within a mapping cycle based on the fourth information, the number of first available transmission resources associated with different second downlink signals may be the same or different, because the network device may indicate different available transmission resources for different downlink signals according to actual conditions.

[0152] In the above situation, the aforementioned fourth information can be carried by any one of DCI, RRC signaling, etc. In one example, the fourth information and the aforementioned second information can be carried by different messages. In another example, the fourth information and the aforementioned second information can be carried by the same message, that is, the second information and the fourth information are included in one message at the same time. In the case where the second information and the fourth information are carried by the same message, when DCI format 1_0 (i.e., the first DCI carries) is used to carry the second information, the fourth information can be carried by "Field 6, PRACH mask index" in DCI format 1_0, and the information field "Field 6, PRACH mask index" needs to be redefined.

[0153] Optionally, when the second parameter is less than 1, the one or more first available transmission resources associated with each of the M second downlink signals in one mapping cycle include one of the following: the designated transmission resources associated with each of the M second downlink signals in one mapping cycle; the available transmission resources in the transmission resource subset associated with each of the M second downlink signals in one mapping cycle. The above-mentioned designated transmission resources associated with each second downlink signal, or the transmission resource subset associated with each second downlink signal, can be determined by the terminal device according to the fourth information sent by the network device. In this case, the fourth information can be carried by the first DCI; specifically, the fourth information is carried by "Field 6" of the first DCI, and the fourth information is specifically a PRACH mask index. The value of the fourth information (i.e., the PRACH mask index) is used to determine the PRACH resource position based on the non-competitive random access process. When the downlink signal is SSB, the definition of each value of the fourth information can be specifically shown in Table 1:

[0154] The value of the fourth information SSB associated available transmission resources 0 All 1 Transmission resources with index number 1 2 Transmission resources with index number 2 3 Transmission resources with index number 3 4 Transmission resources with index number 4 5 Transmission resources with index number 5 6 Transmission resources with index number 6 7 Transmission resources with index number 7 8 Transmission resources with index number 8 9 Transmission resources with even index numbers 10 Transmission resources with odd index numbers

[0155] Table 1

[0156] The fourth information (i.e., PRACH mask index) is only used when SSB_per_RO<1. For example, if SSB_per_RO=1 / 8, then 1 SSB is mapped to 8 ROs. If the fourth information (i.e., PRACH mask index)=3, then PRACH occasion index 3 (i.e., the transmission resource with index number 3) is selected. Here, the transmission resource indicated by the index number is related to whether the index number is defined as 0 or 1 as the minimum value; for example, if the index number 0 is defined as the minimum value, then the transmission resource with index number 1 can refer to the second transmission resource associated with an SSB in a mapping cycle. If the index number 1 is defined as the minimum value, then the transmission resource with index number 1 can refer to the first transmission resource associated with an SSB in a mapping cycle. The PRACH mask index can be 0, which means that the network device only allocates a preamble to the terminal device, but the PRACH occasion in the frequency domain still needs to be selected by the UE itself. The transmission resource with index number 1 in the above Table 1 can be expressed as "RO index 1" (RO index number 1). The expression method of other transmission resources with index numbers 2 to 8 is similar to the above and will not be repeated one by one. The transmission resources with even index numbers in the above Table 1 can be expressed as "every even RO" (all even RO); the transmission resources with odd index numbers in the above Table 1 can be expressed as "every odd RO" (all odd RO). It should be understood that in addition to 0 to 10 shown in the above Table 1, the value of the fourth information can also have other reserved values. For example, the value of the fourth information can also include values ​​11 to 15. These values ​​can be reserved values ​​and are not limited in this embodiment.

[0157] Specifically, when the value of the fourth information is within the first value range, it is used to determine the transmission resource subset associated with each of the M second downlink signals in the one mapping cycle; and / or, when the value of the fourth information is within the second value range, it is used to determine the designated transmission resource associated with each of the M second downlink signals in the one mapping cycle. The above-mentioned first value range is different from the second value range. The first value range may include 0, 9, and 10; the second value range may be 1 to 8. Among them, the transmission resource subset associated with each second downlink signal may include one or more available transmission resources. The number of designated transmission resources associated with each second downlink signal may be one.

[0158] Optionally, when the second parameter is less than 1, the one or more first available transmission resources associated with each of the M second downlink signals in a mapping cycle include: available transmission resources between the starting available transmission resource and the ending available transmission resource associated with each of the M second downlink signals in the one mapping cycle.

[0159] Here, the starting available transmission resource associated with each second downlink signal may be a designated transmission resource. The method for determining the designated transmission resource associated with each second downlink signal has been described in the aforementioned embodiment and will not be repeated here. Accordingly, the ending available transmission resource associated with each second downlink signal may refer to the last transmission resource associated with the second downlink signal in a mapping cycle. For example, in a mapping cycle, there are 4 transmission resources associated with the i-th second downlink signal. Through the aforementioned fourth information, it can be determined that the designated transmission resource associated with the i-th second downlink signal is the second transmission resource therein. Then, the second transmission resource is used as the starting available transmission resource associated with the i-th second downlink signal, and the last transmission resource associated with the i-th second downlink signal, that is, the fourth transmission resource, is used as the ending available transmission resource associated with the i-th second downlink signal. Finally, one or more first available transmission resources associated with the i-th second downlink signal in a mapping cycle can be determined, including the second to fourth transmission resources associated with the i-th second downlink signal.

[0160] Alternatively, the ending available transmission resource associated with each second downlink signal may be a designated transmission resource. The method for determining the designated transmission resource associated with each second downlink signal has been described in the aforementioned embodiment and will not be repeated here. Accordingly, the starting available transmission resource associated with each second downlink signal may refer to the first transmission resource associated with the second downlink signal within a mapping cycle. For example, within a mapping cycle, there are four transmission resources associated with the i-th second downlink signal. Through the aforementioned fourth information, it can be determined that the designated transmission resource associated with the i-th second downlink signal is the second transmission resource therein. The second transmission resource is then used as the ending available transmission resource associated with the i-th second downlink signal, and the first transmission resource associated with the i-th second downlink signal is used as the starting available transmission resource for the i-th second downlink signal. Ultimately, one or more first available transmission resources associated with the i-th second downlink signal within a mapping cycle can be determined, including the first to second transmission resources associated with the i-th second downlink signal.

[0161] Alternatively, the value of the aforementioned fourth information may be redefined. For example, the value of the aforementioned fourth information may be defined as being within the second value range to determine two designated transmission resources. For example, when the value of the fourth information is 1, it is used to designate the first and second transmission resources as designated transmission resources. For example, when the value of the fourth information is 2, it is used to designate the first and fourth transmission resources as designated transmission resources, and so on. This is merely an exemplary description and does not represent a limitation on the value of the fourth information. In this case, the starting available transmission resource and the ending available transmission resource associated with each second downlink signal may be two designated transmission resources. For example, within a mapping cycle, there are four transmission resources associated with the i-th second downlink signal. Through the value of the aforementioned fourth information, it can be determined that the designated transmission resources associated with the i-th second downlink signal are the first transmission resource and the third transmission resource. The first transmission resource is then used as the starting available transmission resource associated with the i-th second downlink signal, and the third transmission resource is used as the ending available transmission resource associated with the i-th second downlink signal. Ultimately, one or more first available transmission resources associated with the i-th second downlink signal within a mapping cycle can be determined, including the first to third transmission resources associated with the i-th second downlink signal.

[0162] It should be understood that, in the above-mentioned processing of one or more first available transmission resources associated with each of the M second downlink signals in a mapping cycle determined based on the value of the fourth information, the number of first available transmission resources associated with different second downlink signals is the same.

[0163] Based on the foregoing embodiment, the following describes a method for a terminal device to determine multiple target transmission resources in this embodiment: the multiple target transmission resources include: multiple continuous transmission resources within one or more mapping cycles. Alternatively, the multiple target transmission resources include: one or more first available transmission resources associated with each of the M second downlink signals within each mapping cycle in one or more mapping cycles.

[0164] Optionally, the multiple target transmission resources include: multiple transmission resources that are continuous within one or more mapping cycles.

[0165] In this case, the starting target transmission resource among the multiple target transmission resources is the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle. The first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle is one of the following: the first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; the first available transmission resource in the transmission resource subset associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; or the designated transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle.

[0166] The first second downlink signal may refer to the one with the smallest index number among the M second downlink signals.

[0167] In the foregoing embodiment, it has been described how to determine one or more available transmission resources associated with each of the M second downlink signals within a mapping cycle; here, the first available transmission resource associated with the first second downlink signal among the M second downlink signals within the first mapping cycle can be used as the starting target transmission resource of multiple target transmission resources.

[0168] Similarly, the method for determining the transmission resource subset associated with each of the M second downlink signals within a mapping cycle has been described in the aforementioned embodiment and is not further described here. The first available transmission resource in the transmission resource subset associated with the first second downlink signal among the M second downlink signals within the first mapping cycle can be used as the starting target transmission resource for the multiple target transmission resources.

[0169] The method for determining the designated transmission resource associated with each of the M second downlink signals within a mapping cycle has been described in the aforementioned embodiment and will not be further elaborated here. The designated transmission resource associated with the first of the M second downlink signals within the first mapping cycle can be used as the starting target transmission resource for multiple target transmission resources. It should be noted that another possibility of the aforementioned embodiment is to designate two designated transmission resources for each second downlink signal. In this case, the first designated transmission resource of the first second downlink signal within the first mapping cycle can be used as the starting target transmission resource for multiple target transmission resources.

[0170] Which of the above methods is used to determine the starting target transmission resource can be configured by the network device for the terminal device, or can be determined by pre-negotiation between the terminal device and the network device, as long as the terminal device and the network device determine to use the same method to determine the starting target transmission resource. In addition, which of the above methods is used to determine the starting target transmission resource may be related or unrelated to the method of determining the number of repeated transmissions of PRACH. For example, the number of repeated transmissions of PRACH is equal to the fourth value, and the fourth value is equal to M multiplied by the second preset value, then the terminal device can use any one of the above methods to determine the starting target transmission resource. For another example, the repeated transmission resource of PRACH is equal to the third value. Since, when determining the third value, the network device may need to send the fourth information to the terminal device to determine the first available transmission resource for each second downlink signal, in this case, the method of determining the starting target transmission resource may be related to the content indicated by the fourth information; for example, assuming that the fourth information indicates the designated transmission resource associated with the second downlink signal, the aforementioned starting target transmission resource can be the designated transmission resource associated with the first second downlink signal in the first mapping cycle; other situations are similar and are not exhaustive.

[0171] After determining the starting target transmission resource, multiple consecutive transmission resources within one or more mapping cycles can be used as target transmission resources; it should be noted that, in addition to the starting target transmission resource, the remaining multiple transmission resources can be used for repeated transmission of PRACH regardless of whether they are associated with any one of the M second downlink signals.

[0172] When the terminal device performs repeated transmission of PRACH, the PRACH carries the first type of preamble. The description of the first type of preamble is the same as that in the aforementioned embodiment and will not be repeated here. In this manner, regardless of whether the M second downlink signals are indicated by the network device or determined by the terminal device, the manner in which the network device determines that the terminal device performs repeated transmission of PRACH, determines the number of repeated transmissions, and determines the target transmission resource can be the same as the manner in which the network device processes the target transmission resource in the case where the second parameter is not less than 1 and the multiple target transmission resources are multiple transmission resources that are continuous within one or more mapping cycles. The description will not be repeated here. Similarly, after the network device determines the target transmission resource, it can perform demodulation processing based on the repeatedly transmitted PRACH received on the target transmission resource. The specific processing method is not limited in this embodiment.

[0173] Optionally, the multiple target transmission resources include: one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in one or more mapping cycles. In this case, the starting target transmission resource of the multiple target transmission resources is the first first available transmission resource associated with the first second downlink signal in the M second downlink signals in the first mapping cycle. The method for determining the one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle has been described in detail in the aforementioned embodiment and will not be repeated here.

[0174] When the terminal device performs repeated transmission of the PRACH, the PRACH carries the first type of preamble. The description of the first type of preamble is the same as that in the previous embodiment and is not repeated here. In this embodiment, regardless of whether the M second downlink signals are indicated by the network device or determined by the terminal device, the manner in which the network device determines that the terminal device performs repeated transmission of the PRACH can be the same as that in the previous embodiment and is not repeated here.

[0175] After the network device determines that the terminal device is performing repeated transmission of the PRACH, it can further determine the number of repeated transmissions of the PRACH and the target transmission resource. In the case where the M second downlink signals are indicated by the network device, the network device determines the number of repeated transmissions of the PRACH and the target transmission resource in the same manner as the terminal device, and no repeated explanation is given. In the case where the M second downlink signals are determined by the terminal device, the network device determines the number of repeated transmissions of the PRACH in the same manner as the aforementioned processing method of the terminal device, and no repeated explanation is given.

[0176] Network devices can determine target transmission resources in several different ways, specifically:

[0177] In one method, the network device can use the transmission resource where the PRACH carrying the first type of preamble code is currently parsed as the target starting transmission resource; based on the mapping relationship between each downlink signal and the transmission resource in a mapping cycle, determine the downlink signal associated with the target starting transmission resource.

[0178] Since M is known to the network device, when M is 1, the network device only needs to determine the downlink signal associated with the target starting transmission resource to determine a unique second downlink signal. The network device can then determine one or more first available transmission resources for each of one or more mapping cycles based on the number of PRACH retransmissions, and use these first available transmission resources as the target transmission resources. In this case, the method for determining the one or more first available transmission resources associated with the second downlink signal is the same as in the previous embodiment and is not repeated here.

[0179] In the case where M is greater than 1, the network device may use a downlink signal associated with the target starting transmission resource determined above as one of the M second downlink signals. The network device may then combine a downlink signal associated with the target starting transmission resource with the signals on the transmission resources associated with other possible downlink signals, respectively, to obtain the PRACH parsing result of each combination; based on the PRACH parsing result corresponding to each combination, determine one or more possible transmission resources, and use the downlink signals associated with the one or more possible transmission resources as the remaining M-1 second downlink signals. After the network device determines all M second downlink signals, it may determine one or more first available transmission resources for each mapping cycle in one or more mapping cycles in the same manner as in the aforementioned embodiment, and finally the network device may use the one or more first available transmission resources for each mapping cycle in one or more mapping cycles as one or more target transmission resources.

[0180] In another manner, after receiving the content corresponding to all transmission resources within a mapping cycle, the network device can analyze whether there is a PRACH carrying a first-class preamble code on each transmission resource; after determining one or more transmission resources occupied by the PRACH carrying the first-class preamble code within a mapping cycle, the network device determines the downlink signal associated with each transmission resource occupied by the PRACH carrying the first-class preamble code based on the mapping relationship, and uses the downlink signal associated with each transmission resource occupied by the PRACH carrying the first-class preamble code as M second downlink signals. After the network device determines all M second downlink signals, it can determine one or more first available transmission resources for each mapping cycle in one or more mapping cycles in the same manner as the aforementioned embodiment, and finally the network device can use the one or more first available transmission resources for each mapping cycle in one or more mapping cycles as one or more target transmission resources.

[0181] Similarly, after the network device determines the target transmission resource, it may perform demodulation processing based on the repeatedly transmitted PRACH received on the target transmission resource. The specific processing method is not limited in this embodiment.

[0182] The above implementation method provides a detailed description of the method for determining the number of repeated transmissions of the PRACH and determining multiple target transmission resources when the second parameter is less than 1 and the network device has not configured the aforementioned first parameter (i.e., the parameter for determining the number of repeated transmissions of the PRACH) to the terminal device. Below, with reference to Figures 11 to 14, an exemplary description is given, taking the downlink signal as SSB and the second parameter as SSB_per_RO as an example:

[0183] The method for determining the starting target transmission resource of the target transmission resource is to take part 1110 of Figure 11 as an example. There are 8 SSBs in total, and SSB_per_RO = 1 / 2, then one RO can map 1 / 2 SSB, that is, 1 SSB is mapped to 2 ROs; assuming that the M second SSBs include SSB 1 and SSB2; the terminal device uses the transmission resources associated with the SSB as available transmission resources, then the one or more first available transmission resources associated with SSB 1 are the 1st and 2nd ROs in the mapping cycle, and the one or more first available transmission resources associated with SSB 2 are the 3rd and 4th ROs in the mapping cycle; the first available RO associated with SSB 1 is: RO 1112 of the first mapping cycle 1111, and the RO 1112 is used as the starting target transmission resource among multiple target transmission resources. Taking part 1120 of Figure 11 as an example, if there are 8 SSBs in total and SSB_per_RO = 1 / 4, then one RO can map 1 / 4 of the SSB, that is, one SSB is mapped to four ROs; assuming that the M second SSBs include SSB 2 and SSB4, then the multiple available transmission resources associated with SSB 2 are the 5th to 8th ROs in a mapping cycle, that is, the 4 ROs after the 4 ROs associated with SSB1. The first available RO associated with SSB 2 is RO 1122 in the first mapping cycle 1121, and RO 1112 is used as the starting target transmission resource among the multiple target transmission resources. Here, the arrangement of ROs within a mapping cycle is from low frequency to high frequency in the frequency domain and in time sequence in the time domain, that is, the ROs are arranged from low to high frequency in the earliest time domain position, then the ROs are arranged from low to high frequency in the next time domain position, and so on, and no further details are given.

[0184] In conjunction with Figure 12 , an example is provided for illustrating that the multiple target transmission resources include multiple transmission resources that are continuous within one or more mapping cycles. For example, in conjunction with portion 1210 of Figure 12 , SSB_per_RO = 1 / 2, a mapping cycle includes 16 ROs, the number of PRACH repetitions is 4, and it is assumed that the M second SSBs include SSB 1 and SSB 2; the starting target RO of the multiple target ROs may be the first available RO associated with SSB 1, i.e., RO 1211 in Figure 12 ; the multiple target ROs 1212 include the three consecutive ROs starting from and following the starting target RO within the first mapping cycle. Taking section 1220 of Figure 12 as an example, SSB_per_RO = 1 / 4, a mapping cycle includes 32 ROs, the number of PRACH retransmissions is equal to 8, and assuming that the M second SSBs include SSB 2 and SSB 4; the starting target RO of the multiple target ROs can be: the first available RO associated with SSB 2, that is, RO 1221 in Figure 12; the multiple target ROs 1222 include: within the first mapping cycle, starting from and including the seven consecutive ROs of the starting target RO. The above is merely an example and does not exhaust all possible situations.

[0185] In conjunction with Figure 13, the multiple target transmission resources include one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in one or more mapping cycles. For example, in conjunction with part 1310 of Figure 13, SSB_per_RO = 1 / 2, a mapping cycle includes 16 ROs, the number of repeated transmissions of PRACH is equal to 4, and the M second SSBs include SSB 1 and SSB2; the first available transmission resources associated with SSB 1 are the 1st to 2nd ROs in a mapping cycle; the first available transmission resources associated with SSB 2 are the 3rd to 4th ROs in a mapping cycle; the starting target RO of the multiple target ROs can be: the first available RO associated with SSB1, that is, RO 1311 in Figure 13; the multiple target ROs 1312 include: the 1st to 4th ROs in the first mapping cycle. Taking part 1320 of Figure 13 as an example, SSB_per_RO = 1 / 4, a mapping cycle includes 32 ROs, the number of repeated transmissions of PRACH is equal to 8, assuming that the M second SSBs include SSB 2 and SSB4; the first available transmission resource associated with SSB 2 is the 5th to 8th RO in a mapping cycle; the first available transmission resource associated with SSB 4 is the 13th to 16th RO in a mapping cycle; then the starting target RO among the multiple target ROs is the 5th RO 1321 in the first mapping cycle, and the multiple target ROs 1322 include: the 5th to 8th RO and the 13th to 16th RO in the first mapping cycle.

[0186] In conjunction with Figure 14, the multiple target transmission resources include one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in one or more mapping cycles. Assume that the starting transmission resource is the designated transmission resource. For example, in conjunction with part 1410 of Figure 14, SSB_per_RO = 1 / 2, one mapping cycle includes 16 ROs, the number of repeated transmissions of PRACH is equal to 4, and the M second SSBs include SSB 1 and SSB2; the designated transmission resource of SSB1 is the second RO, then the starting target RO of the multiple target ROs can be: the second RO associated with SSB1 in the first mapping cycle, that is, RO 1411 in Figure 14; the multiple target ROs include: the starting target RO and the second RO associated with SSB2 in the first mapping cycle, and the second RO associated with SSB1 and the second RO associated with SSB2 in the second mapping cycle in the dotted box in part 1410 of Figure 14.

[0187] Taking part 1420 of FIG. 14 as an example, SSB_per_RO = 1 / 4, a mapping cycle includes 32 ROs, the number of repeated PRACH transmissions is equal to 4, and the M second SSBs include SSB2 and SSB3; the designated transmission resource is the third RO of each SSB, and the one or more first available transmission resources associated with each second downlink signal are the designated transmission resource as the starting available transmission resource and the last associated transmission resource as the ending available transmission resource; then the starting target RO of the multiple target ROs can be: the third available RO 1421 associated with SSB2 in the first mapping cycle; the multiple target ROs 1422 include: the starting target RO, the fourth RO associated with SSB2, and the third and fourth ROs associated with SSB3 in the first mapping cycle. The above is merely an example and does not exhaust all possible situations.

[0188] In a possible implementation manner, the number of repeated transmissions of the PRACH may be determined according to information configured by a network device.

[0189] In this manner, the value indicated by the network device can be used to determine the number of repeated transmissions of the PRACH. In this case, the network device may carry a fifth value in the first parameter in the aforementioned second information. Alternatively, the network device may indicate through other information. Exemplarily, the processing method of the network device further includes: the network device sends third information, the third information carries a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH. The processing method of the terminal device also includes: the terminal device receives third information, the third information carries a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

[0190] In some possible implementations, the terminal device may directly use the fifth value as the number of PRACH retransmissions, that is, the number of PRACH retransmissions is equal to the fifth value. In this case, the network device directly indicates the number of PRACH retransmissions on the terminal device side.

[0191] Under this embodiment, if the aforementioned second parameter is not less than 1, that is, one or more second downlink signals among the M second downlink signals are associated with the same transmission resource, then the starting target transmission resource of the multiple target transmission resources can be: the first second available transmission resource in the first mapping cycle.

[0192] Furthermore, the multiple target transmission resources may include the starting target transmission resource and multiple continuous transmission resources thereafter. In this case, regardless of whether the multiple continuous transmission resources after the starting target transmission resource are associated with M second downlink signals, they can be used as target transmission resources. Alternatively, the multiple target transmission resources may include: one or more second available transmission resources in each mapping cycle in one or more mapping cycles. The method for determining one or more second available transmission resources in a mapping cycle has been described in detail in the aforementioned embodiment and will not be repeated here.

[0193] If the aforementioned second parameter is less than 1, that is, different second downlink signals among the M second downlink signals are associated with different transmission resources, and each second downlink signal is associated with multiple transmission resources. Then, the starting target transmission resource of the aforementioned multiple target transmission resources may be: the first first available transmission resource associated with the first second downlink signal among the M second downlink signals within the first mapping cycle. In this case, the method for determining the first first available transmission resource associated with the first second downlink signal among the M second downlink signals within the first mapping cycle is the same as that in the aforementioned embodiment and is not further described.

[0194] Furthermore, the multiple target transmission resources may include the starting target transmission resource and the multiple continuous transmission resources thereafter. In this case, regardless of whether the multiple continuous transmission resources after the starting target transmission resource are associated with M second downlink signals, they can be used as target transmission resources. Alternatively, the multiple target transmission resources include: in one or more mapping cycles, one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle. The method for determining the one or more first available transmission resources associated with each second downlink signal has been described in the aforementioned embodiment and will not be repeated here.

[0195] In this embodiment, if the multiple target transmission resources include one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in one or more mapping cycles; then the number of first available transmission resources associated with each second downlink signal may be equal to the fifth value divided by M, that is, the number of first available transmission resources associated with each second downlink signal may be the same. Therefore, the first available transmission resource preferably applicable to each second downlink signal is determined based on the transmission resource subset or designated transmission resource of each second downlink signal. Alternatively, the number of first available transmission resources for each second downlink signal may not be limited to being the same, and the fifth value is used to represent the sum of the number of first available transmission resources associated with all M second downlink signals.

[0196] In this implementation manner, the example descriptions of each target transmission resource are similar to those in the above-mentioned embodiment and will not be repeated.

[0197] Optionally, when the aforementioned terminal device performs repeated PRACH transmission, the PRACH carries a first-type preamble; the first-type preamble is the same as described in the aforementioned embodiment. The network device determines whether the terminal device performs repeated PRACH transmission and the target transmission resource in different situations in the same manner as in the aforementioned embodiment, and no repeated description is given.

[0198] In some possible implementations, the number of repeated transmissions of the PRACH is equal to the product of the fifth value and the sixth value.

[0199] In a possible implementation, the sixth value is configured by the network device, or is preset, or is related to a second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource.

[0200] Optionally, the sixth value is configured or preset by the network device, and the sixth value can be simply understood as a multiple used in a calculation. That is to say, after the network device is configured with the fifth value, the terminal device can use a multiple pre-configured by the network device or preset by itself, and multiply it by the fifth value to obtain the repeated transmission resource of the PRACH. In this case, the method for determining the starting target transmission resource and the method for determining the target transmission resource are similar to the aforementioned multiple implementations in which the second parameter is less than 1 or not greater than 1 when only the fifth value is used. It is only necessary to replace the fifth value in the aforementioned implementation with the product of the fifth value and the sixth value, and no repeated explanation is given here.

[0201] Optionally, when the sixth value is related to the second parameter, the sixth value is one of the following: when the second parameter is not less than 1, it is equal to the first preset value; when the second parameter is not less than 1, it is equal to the second parameter. Here, the relevant description of the first preset value is the same as the aforementioned embodiment and is not repeated. The several possible values ​​of the sixth value can also be understood as the terminal device can select different multiples to calculate the number of repeated transmissions of PRACH. When the second parameter is not less than 1, one or more second downlink signals are associated with the same second available transmission resource. The method for determining the starting target transmission resource and the method for determining the target transmission resource are similar to the aforementioned multiple implementations in which the second parameter is not greater than 1 when only the fifth value is used. It is only necessary to replace the fifth value in the aforementioned implementation with the product of the fifth value and the sixth value, and no repeated description is given here.

[0202] Optionally, when the sixth value is related to the second parameter, the sixth value is one of the following: when the second parameter is less than 1, it is equal to M multiplied by the second preset value; wherein M is the number of second downlink signals, and M is a positive integer; when the second parameter is less than 1, it is equal to M multiplied by the reciprocal of the second parameter; when the second parameter is less than 1, it is equal to M. Here, the relevant description of the second preset value is the same as that in the aforementioned embodiment and is not repeated. The several possible values ​​of the sixth value can also be understood as the terminal device can select different multiples to calculate the number of repeated transmissions of PRACH.

[0203] In which, when the sixth value is equal to M, M can be regarded as a multiple of the fifth value, which does not mean that the number of first available transmission resources associated with each second downlink signal must be controlled to be the fifth value; or, the sixth value can be understood as the number of second downlink signals, and the corresponding fifth value represents the number of first available transmission resources associated with each second downlink signal.

[0204] Furthermore, for the case where the sixth value is equal to M, if the terminal device itself determines the first available transmission resource for each second downlink signal, it may be possible to: arbitrarily select the fifth value of available transmission resources from the multiple transmission resources associated with each second downlink signal as the first available transmission resource associated with the second downlink signal; or, it may be possible to select the fifth value of available transmission resources with the smallest index number from the multiple transmission resources associated with each second downlink signal as the first available transmission resource associated with the second downlink signal. At this time, if the network device configures or indicates the first available transmission resource for each second downlink signal for the terminal device, the network device may indicate or configure the fifth value of the first available transmission resource associated with each second downlink signal for the terminal device.

[0205] When the second parameter is less than 1, one or more second downlink signals are associated with the same second available transmission resource. The method for determining the starting target transmission resource and the method for determining the target transmission resource are similar to the various implementation methods in which the second parameter is greater than 1 when only the fifth value is used. It is only necessary to replace the fifth value in the aforementioned implementation method with the product of the fifth value and the sixth value, and no repeated explanation is given here.

[0206] Optionally, when the aforementioned terminal device performs repeated transmission of PRACH, the PRACH carries a first type of preamble; the first type of preamble is the same as that described in the aforementioned embodiment. The network device determines whether the terminal device performs repeated transmission of PRACH and the method for determining the target transmission resource in different situations are the same as those in the aforementioned embodiment and are not repeated. The way in which the network device determines the number of repeated transmissions of PRACH is the same as that described in the aforementioned embodiment, so it is not repeated.

[0207] In one possible implementation, when the sixth value is related to the second parameter, the fifth value is the number of mapping cycles occupied by repeated transmission of PRACH; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource.

[0208] In this implementation, the network device instructs the terminal device to perform repeated PRACH transmissions in the fifth mapping cycle. The terminal device determines the number of first available transmission resources or the number of second available transmission resources used in each mapping cycle as the sixth value. The total number of repeated PRACH transmissions in the fifth mapping cycle is obtained by multiplying the sixth value by the fifth value.

[0209] Optionally, when the second parameter is less than 1, the sixth value is equal to the sum of the number of one or more first available transmission resources associated with the M second downlink signals in a mapping cycle. Based on the processing of this embodiment, the multiple target transmission resources include: one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in the fifth value mapping cycle. That is, the number of mapping cycles is the specified fifth value. Here, the method for determining the one or more first available transmission resources associated with each second downlink signal has been described in detail in the aforementioned embodiment and will not be repeated here. The method for determining the starting target transmission resource of the target transmission resource is the same as that of the other embodiments in the case where the second parameter is less than 1, so it will not be repeated here.

[0210] Optionally, when the second parameter is not less than 1, the sixth value is equal to the number of one or more second available transmission resources in a mapping cycle; wherein each of the one or more second available transmission resources is associated with one or more second downlink signals in the M second downlink signals. Based on the processing of this embodiment, the multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in the fifth value mapping cycle. That is, the number of mapping cycles is the specified fifth value. Here, the method for determining each second available transmission resource has been described in detail in the aforementioned embodiment and will not be repeated here. The method for determining the starting target transmission resource of the target transmission resource is the same as that of the other embodiments in which the second parameter is not less than 1, so it will not be repeated.

[0211] Optionally, when the aforementioned terminal device performs repeated transmission of PRACH, the PRACH carries a first type of preamble; the first type of preamble is the same as described in the aforementioned embodiment. The way in which the network device determines whether the terminal device performs repeated transmission of PRACH and the target transmission resource under different circumstances are the same as in the aforementioned embodiment and are not described again. The way in which the network device determines the number of repeated transmissions of PRACH is the same as described in the aforementioned embodiment and is not described again. It should be pointed out that, in the present embodiment, the fifth value configured by the network device is the number of specified mapping cycles. Therefore, after determining the target transmission resource within a mapping cycle, the network device only receives and parses the PRACH on the target transmission resource in each mapping cycle within the aforementioned fifth value mapping cycles.

[0212] Regarding the processing of the fifth value as the number of mapping cycles in this embodiment, an example is provided with reference to FIG15 , where the downlink signal is an SSB and the second parameter is SSB_per_RO. With reference to section 1501 of FIG15 , SSB_per_RO = 1 / 4, a mapping cycle includes 32 ROs, the fifth value is 1, and the M second SSBs include SSB2 and SSB3. The one or more first available transmission resources associated with each second downlink signal (i.e., SSB2 or SSB3) are all available transmission resources. The number of first available transmission resources associated with each SSB is 4, and the total number of first available transmission resources associated with SSB2 and SSB3 in each mapping cycle is 8. Therefore, the number of PRACH repetitions is 8. The starting target RO of the multiple target ROs may be the first available RO associated with SSB2 in the first mapping cycle. The multiple target ROs 1511 include the fourth RO associated with SSB2 and the four ROs associated with SSB3 in the first mapping cycle. The above is merely an example and does not exhaust all possible scenarios.

[0213] Taking part 1502 of Figure 15 as an example, SSB_per_RO = 1 / 2, a mapping cycle includes 16 ROs, the fifth value is equal to 2, and the M second SSBs include SSB 1; the number of first available transmission resources associated with each second downlink signal is 2, then the number of repeated transmissions of PRACH is 2 times 2, which is equal to 4; the starting target RO of multiple target ROs can be: the first RO associated with SSB1 in the first mapping cycle; the multiple target ROs include the dotted box in part 1521 of Figure 15: 2 ROs associated with SSB1 in the first mapping cycle, and 2 ROs associated with SSB1 in the second mapping cycle.

[0214] Taking part 1503 of Figure 15 as an example, SSB_per_RO = 1, a mapping cycle includes 8 ROs, the fifth value is equal to 4, and the M second SSBs include SSB 1 and SSB2; each second downlink signal is associated with a second available transmission resource, then the number of repeated transmissions of PRACH is 2 times 4, which is equal to 8; the starting target RO of multiple target ROs can be: the first RO in the first mapping cycle; the multiple target ROs include the dotted box in part 1531 of Figure 15: 1 RO associated with SSB1 and SSB2 in the 1st mapping cycle to the 4th mapping cycle.

[0215] Taking part 1504 of Figure 15 as an example, SSB_per_RO = 2, a mapping cycle includes 4 ROs, the fifth value is equal to 8, and the M second SSBs include SSB 1 and SSB2; 2 second downlink signals are associated with a second available transmission resource, that is, each mapping cycle includes a second available transmission resource, then the number of repeated transmissions of PRACH is 8 times 1, which is equal to 8; the starting target RO of multiple target ROs can be: the first RO in the first mapping cycle; the multiple target ROs include the dotted box in part 1541 of Figure 15: the first RO in the 1st mapping cycle to the 8th mapping cycle.

[0216] Taking part 1505 of Figure 15 as an example, SSB_per_RO = 8, one mapping cycle includes 1 RO, the fifth value is equal to 8, and the M second SSBs include SSB 1, SSB2, and SSB3; the three second downlink signals are associated with the same second available transmission resource, that is, each mapping cycle includes a second available transmission resource, then the number of repeated transmissions of PRACH is 8 times 1, which is equal to 8; the starting target RO of multiple target ROs can be: the first RO in the first mapping cycle; the multiple target ROs include the one in the dotted box in part 1551 of Figure 15: 1 RO in the 1st mapping cycle to the 8th mapping cycle.

[0217] In the above various implementations, detailed descriptions are given on how to determine the number of repeated transmissions of the PRACH and multiple target transmission resources in different situations.

[0218] Finally, it should be pointed out that the repeated transmission of PRACH involved in all the above solutions of this embodiment can be used for four-step random access (such as msg 1) or for two-step random access (such as msg A), which is within the protection scope of this embodiment.

[0219] It can be seen that by adopting the above solution, the terminal device can determine whether to repeat PRACH transmission based on the results obtained by its own processing. In this way, the terminal device can add the function of enabling PRACH repeated transmission, and then repeat PRACH transmission when needed. When repeating PRACH transmission, PRACH coverage can be enhanced, thereby improving PRACH transmission performance.

[0220] FIG16 is a schematic block diagram of a terminal device according to an embodiment of the present application. The terminal device may include:

[0221] The first processing unit 1601 is used to determine whether to repeatedly transmit the physical random access channel PRACH based on first information; wherein the first information is obtained by processing by the terminal device.

[0222] The first processing unit is used to perform repeated transmission of PRACH on multiple target transmission resources when it is determined to perform repeated transmission of PRACH; wherein the number of the multiple target transmission resources is the same as the number of repeated transmissions of PRACH, and each of the multiple target transmission resources is used for one PRACH transmission.

[0223] The first processing unit is configured to determine to perform repeated transmission of the PRACH when the first information satisfies a first condition.

[0224] The first information includes a transmission result of a previous transmission of the PRACH; the first processing unit is configured to determine that a first condition is satisfied when the transmission result of the previous transmission of the PRACH is a transmission failure.

[0225] The first processing unit is used to perform one of the following: when the last PRACH transmission was performed and no random access response RAR was received, determining that the transmission result of the last PRACH transmission was a transmission failure; when the last PRACH transmission was performed and no conflict resolution message was received, determining that the transmission result of the last PRACH transmission was a transmission failure.

[0226] The first information includes a measurement result of a first downlink signal; and the first processing unit is configured to determine that a first condition is satisfied when the measurement result of the first downlink signal is less than a first threshold value.

[0227] The first threshold value is preset, or determined by the terminal device, or configured by the network device.

[0228] When the first threshold value is configured by the network device, it is carried by one of the following: feature combination preamble code; random access channel RACH public configuration parameters; message msg A public configuration parameters; beam failure recovery configuration; msg A configuration parameters in RACH public configuration parameters.

[0229] When the first threshold value is determined by the terminal device, the first threshold value is determined based on the second threshold value; wherein, the second threshold value is configured by the network device.

[0230] Based on FIG16 , as shown in FIG17 , the terminal device further includes: a first communication unit 1602 for receiving second information; the second information is used by the terminal device to determine whether to perform repeated transmission of the PRACH.

[0231] The first processing unit is configured to determine to perform repeated transmission of the PRACH when the first information satisfies a first condition, the second information includes first indication information, and the first indication information is used to indicate starting repeated transmission of the PRACH.

[0232] When the value of the first indication information is the first value, it is used to indicate the start of repeated transmission of PRACH; or when the transmission type of PRACH included in the first indication information is the repeated transmission type, it is used to indicate the start of repeated transmission of PRACH.

[0233] The first processing unit is configured to determine to perform repeated transmission of the PRACH when the second information includes a first threshold value and the first information satisfies a first condition; wherein the first threshold value is a threshold value related to a measurement result of a downlink signal.

[0234] The first processing unit is used to determine the repeated transmission of PRACH when the first information meets the first condition and the value of the first parameter indicated by the second information is a valid value; wherein the value of the first parameter is used to determine the number of repeated transmissions of PRACH.

[0235] The number of repeated transmissions of the PRACH is related to a second parameter, where the second parameter is used to indicate the number of downlink signals associated with one transmission resource.

[0236] When the second parameter is not less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a first value, which is equal to M multiplied by the second parameter; where M is the number of second downlink signals, and M is a positive integer; a second value, which is equal to M multiplied by a first preset value.

[0237] When the second parameter is less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a third value; the third value is the sum of the number of one or more first available transmission resources associated with M second downlink signals in a mapping cycle; where M is a positive integer; a fourth value; the fourth value is equal to M multiplied by the second preset value.

[0238] The number of repeated transmissions of the PRACH is equal to the minimum value between the third value and the fourth value.

[0239] The first communication unit is configured to receive third information, where the third information carries a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

[0240] The value of the first parameter includes a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

[0241] The number of repeated transmissions of the PRACH is equal to the fifth value.

[0242] The number of repeated transmissions of the PRACH is equal to the product of the fifth value and the sixth value.

[0243] The sixth value is configured or preset by the network device.

[0244] The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource;

[0245] The sixth value is one of the following: when the second parameter is not less than 1, it is equal to the first preset value; when the second parameter is not less than 1, it is equal to the second parameter.

[0246] The sixth value is related to the second parameter; wherein, the second parameter is used to represent the number of downlink signals associated with a transmission resource; the sixth value is one of the following: when the second parameter is less than 1, it is equal to M multiplied by a second preset value; wherein M is the number of second downlink signals, and M is a positive integer; when the second parameter is less than 1, it is equal to M multiplied by the reciprocal of the second parameter; when the second parameter is less than 1, it is equal to M.

[0247] The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; and the fifth value is the number of mapping cycles occupied by repeated transmission of the PRACH.

[0248] When the second parameter is less than 1, the sixth value is equal to the sum of the number of the one or more first available transmission resources respectively associated with the M second downlink signals in one mapping cycle.

[0249] When the second parameter is not less than 1, the sixth value is equal to the number of one or more second available transmission resources within a mapping cycle; wherein each of the one or more second available transmission resources is associated with one or more second downlink signals among the M second downlink signals.

[0250] The multiple target transmission resources include: multiple transmission resources that are continuous within one or more mapping cycles.

[0251] The multiple target transmission resources include: in one or more mapping cycles, one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle.

[0252] The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in one or more mapping cycles; wherein each second available transmission resource in the one or more second available transmission resources is associated with one or more second downlink signals in M ​​second downlink signals.

[0253] The multiple target transmission resources include: one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in the fifth mapping cycle.

[0254] The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in the fifth mapping cycle.

[0255] The starting target transmission resource among the multiple target transmission resources is the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle;

[0256] Among them, in the first mapping cycle, the first first available transmission resource associated with the first second downlink signal among the M second downlink signals is one of the following: in the first mapping cycle, the first available transmission resource associated with the first second downlink signal among the M second downlink signals; in the first mapping cycle, the first available transmission resource in the transmission resource subset associated with the first second downlink signal among the M second downlink signals; in the first mapping cycle, the designated transmission resource associated with the first second downlink signal among the M second downlink signals.

[0257] The starting target transmission resource among the multiple target transmission resources is the first second available transmission resource in the first mapping cycle.

[0258] When the second parameter is less than 1, the one or more first available transmission resources associated with each of the M second downlink signals in a mapping cycle include one of the following: one or more available transmission resources associated with each of the M second downlink signals in the mapping cycle; designated transmission resources associated with each of the M second downlink signals in the mapping cycle; available transmission resources in a subset of transmission resources associated with each of the M second downlink signals in the mapping cycle; available transmission resources between the starting available transmission resource and the ending available transmission resource associated with each of the M second downlink signals in the mapping cycle; wherein, the starting available transmission resource and / or the ending available transmission resource associated with each second downlink signal is the designated transmission resource associated with each second downlink signal.

[0259] The first communication unit is configured to receive fourth information; wherein, the fourth information is used to determine one or more available transmission resources associated with each of the M second downlink signals within a mapping cycle when the second parameter is less than 1.

[0260] The fourth information includes a bit map; the bit map is used to indicate one or more available transmission resources associated with each of the M second downlink signals in a mapping cycle.

[0261] When the value of the fourth information is within the first value range, it is used to determine the transmission resource subset associated with each of the M second downlink signals in the one mapping cycle; and / or, when the value of the fourth information is within the second value range, it is used to determine the designated transmission resource associated with each of the M second downlink signals in the one mapping cycle.

[0262] Within a mapping cycle, the one or more second available transmission resources include: within the one mapping cycle, an available transmission resource associated with each second downlink signal of the M second downlink signals; wherein, the one available transmission resource associated with each second downlink signal is determined based on the second parameter when the second parameter is not less than 1.

[0263] The mapping cycle includes: transmission resources mapped to multiple downlink signals; the multiple downlink signals include the M second downlink signals.

[0264] The M second downlink signals are downlink signals used by the terminal device.

[0265] The M second downlink signals are indicated by the fifth information.

[0266] The first processing unit is configured to select the M second downlink signals from the multiple downlink signals based on measurement results corresponding to the multiple downlink signals respectively; wherein M is configured by the network device or preset.

[0267] The first processing unit is used to perform one of the following: selecting M second downlink signals with the largest measurement results from the multiple downlink signals; and determining M second downlink signals based on the downlink signal with a measurement result greater than the first threshold value when there is a downlink signal among the multiple downlink signals.

[0268] The downlink signal includes: a synchronization signal block SSB, or a channel state information reference signal CSI-RS.

[0269] The transmission resource is a PRACH opportunity.

[0270] In the case of repeated transmission of PRACH, the PRACH is used to carry a first type of preamble code; the first type of preamble code is a preamble code used when repeated transmission of PRACH is performed; the first type of preamble code is preset or configured by a network device.

[0271] The terminal device of the embodiment of the present application can implement the corresponding functions of the terminal device in the aforementioned method embodiment. The processes, functions, implementation methods and beneficial effects corresponding to the various modules (sub-modules, units or components, etc.) in the terminal device can be found in the corresponding descriptions in the above-mentioned method embodiments, which will not be repeated here. It should be noted that the functions described by the various modules (sub-modules, units or components, etc.) in the terminal device of the embodiment of the application can be implemented by different modules (sub-modules, units or components, etc.) or by the same module (sub-module, unit or component, etc.).

[0272] FIG18 is a schematic block diagram of a network device according to an embodiment of the present application. The network device may include:

[0273] The second communication unit 1801 is used to receive a physical random access channel PRACH; wherein, whether the PRACH is a repeated transmission is determined by the terminal device based on first information, and the first information is obtained by processing by the terminal device.

[0274] The second communication unit is used to receive repeatedly transmitted PRACH on multiple target transmission resources; wherein the number of the multiple target transmission resources is the same as the number of repeated transmissions of PRACH, and each of the multiple target transmission resources is used to receive PRACH once.

[0275] The network device also includes: a second processing unit 1802, which is used to parse the preamble carried in the PRACH after receiving the PRACH sent by the terminal device; when the preamble carried by the PRACH is a first-type preamble, the network device determines that the terminal device performs repeated transmission of the PRACH, and receives the PRACH repeatedly transmitted by the terminal device on the multiple target transmission resources through the second communication unit; wherein the first-type preamble is a preamble used by the terminal device when performing repeated transmission of the PRACH; the first-type preamble is preset, or the network device is configured for the terminal device.

[0276] The second communication unit is used to configure a first threshold value for the terminal device through one of the following: feature combination preamble code; random access channel RACH public configuration parameters; message msg A public configuration parameters; beam failure recovery configuration; msg A special configuration parameters in the RACH public configuration parameters.

[0277] The second communication unit is used to configure a second threshold value for the terminal device, and the second threshold value is used by the terminal device to determine the first threshold value.

[0278] The second communication unit is used to send second information to the terminal device; the second information is used by the terminal device to determine whether to perform repeated transmission of PRACH.

[0279] The second information includes first indication information; wherein, when the value of the first indication information is the first value, it is used to indicate the start of repeated transmission of PRACH; or, when the transmission type of PRACH included in the first indication information is a repeated transmission type, it is used to indicate the start of repeated transmission of PRACH.

[0280] The second information includes a first threshold value; wherein the first threshold value is a threshold value related to the measurement result of the downlink signal.

[0281] The second information is used to indicate the value of the first parameter, and the value of the first parameter is used by the terminal device to determine the number of repeated transmissions of PRACH.

[0282] The number of repeated transmissions of the PRACH is related to a second parameter, where the second parameter is used to indicate the number of downlink signals associated with one transmission resource.

[0283] When the second parameter is not less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a first value, which is equal to M multiplied by the second parameter; where M is the number of second downlink signals, and M is a positive integer; a second value, which is equal to M multiplied by a first preset value.

[0284] When the second parameter is less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a third value; the third value is the sum of the number of one or more first available transmission resources associated with M second downlink signals in a mapping cycle; where M is a positive integer; a fourth value; the fourth value is equal to M multiplied by the second preset value.

[0285] The number of repeated transmissions of the PRACH is equal to the minimum value between the third value and the fourth value.

[0286] The second communication unit is used to send third information to the terminal device, where the third information carries a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

[0287] The value of the first parameter includes a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

[0288] The number of repeated transmissions of the PRACH is equal to the fifth value.

[0289] The number of repeated transmissions of the PRACH is equal to the product of the fifth value and the sixth value.

[0290] The sixth value is configured or preset by the network device for the terminal device.

[0291] The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; the sixth value is one of the following: when the second parameter is not less than 1, it is equal to the first preset value; when the second parameter is not less than 1, it is equal to the second parameter.

[0292] The sixth value is related to the second parameter; wherein, the second parameter is used to represent the number of downlink signals associated with a transmission resource; the sixth value is one of the following: when the second parameter is less than 1, it is equal to M multiplied by a second preset value; wherein M is the number of second downlink signals, and M is a positive integer; when the second parameter is less than 1, it is equal to M multiplied by the reciprocal of the second parameter; when the second parameter is less than 1, it is equal to M.

[0293] The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; and the fifth value is the number of mapping cycles occupied by repeated transmission of the PRACH.

[0294] When the second parameter is less than 1, the sixth value is equal to the sum of the number of the one or more first available transmission resources respectively associated with the M second downlink signals in one mapping cycle.

[0295] When the second parameter is not less than 1, the sixth value is equal to the number of one or more second available transmission resources within a mapping cycle; wherein each of the one or more second available transmission resources is associated with one or more second downlink signals among the M second downlink signals.

[0296] The multiple target transmission resources include: multiple transmission resources that are continuous within one or more mapping cycles.

[0297] The multiple target transmission resources include: in one or more mapping cycles, one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle.

[0298] The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in one or more mapping cycles; wherein each second available transmission resource in the one or more second available transmission resources is associated with one or more second downlink signals in M ​​second downlink signals.

[0299] The multiple target transmission resources include: one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in the fifth numerical mapping cycle.

[0300] The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in the fifth mapping cycle.

[0301] The starting target transmission resource among the multiple target transmission resources is the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; wherein, the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle is one of the following: the first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; the first available transmission resource in the transmission resource subset associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; the designated transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle.

[0302] The starting target transmission resource among the multiple target transmission resources is the first second available transmission resource in the first mapping cycle.

[0303] The second communication unit is used to send fourth information to the terminal device, wherein the fourth information is used by the terminal device to determine one or more available transmission resources associated with each of the M second downlink signals within a mapping cycle when the second parameter is less than 1.

[0304] The fourth information includes a bit map; the bit map is used to indicate one or more available transmission resources associated with each of the M second downlink signals in a mapping cycle.

[0305] When the value of the fourth information is within the first value range, the terminal device is used to determine the transmission resource subset associated with each of the M second downlink signals in the one mapping cycle; and / or, when the value of the fourth information is within the second value range, the terminal device is used to determine the designated transmission resource associated with each of the M second downlink signals in the one mapping cycle.

[0306] The mapping cycle includes: transmission resources mapped to multiple downlink signals; the multiple downlink signals include the M second downlink signals.

[0307] The second communication unit is used to send fifth information to the terminal device, and the fifth information is used to indicate M second downlink signals.

[0308] The downlink signal includes: a synchronization signal block SSB, or a channel state information reference signal CSI-RS.

[0309] The transmission resource is a PRACH opportunity.

[0310] The network device of the embodiment of the present application can implement the corresponding functions of the network device in the aforementioned method embodiment. In addition to the above-mentioned second communication unit, the network device may also include a second processing unit, which can be used to determine the number of repeated transmissions of PRACH and the target transmission resources, etc., but it is not schematically illustrated in the figure. The processes, functions, implementation methods and beneficial effects corresponding to each module (sub-module, unit or component, etc.) in the network device can be found in the corresponding description in the above-mentioned method embodiment, and will not be repeated here. It should be noted that the functions described in the various modules (sub-modules, units or components, etc.) in the network device of the embodiment of the application can be implemented by different modules (sub-modules, units or components, etc.), or by the same module (sub-module, unit or component, etc.).

[0311] Figure 19 is a schematic structural diagram of a communication device 1900 according to an embodiment of the present application. The communication device 1900 includes a processor 1910, which can call and execute a computer program from a memory to enable the communication device 1900 to implement the method in the embodiment of the present application.

[0312] In one embodiment, the communication device 1900 may further include a memory 1920. The processor 1910 may call and execute a computer program from the memory 1920 to enable the communication device 1900 to implement the method in the embodiment of the present application. The memory 1920 may be a separate device independent of the processor 1910 or may be integrated into the processor 1910.

[0313] In one embodiment, the communication device 1900 may further include a transceiver 1930. The processor 1910 may control the transceiver 1930 to communicate with other devices. Specifically, the transceiver 1930 may send information or data to other devices or receive information or data sent by other devices. The transceiver 1930 may include a transmitter and a receiver. The transceiver 1930 may further include one or more antennas.

[0314] In one embodiment, the communication device 1900 may be a terminal device of an embodiment of the present application, and the communication device 1900 may implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0315] In one embodiment, the communication device 1900 may be a network device of an embodiment of the present application, and the communication device 1900 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0316] 20 is a schematic structural diagram of a chip 2000 according to an embodiment of the present application. The chip 2000 includes a processor 2010, which can call and execute a computer program from a memory to implement the method according to the embodiment of the present application.

[0317] In one embodiment, the chip 2000 may further include a memory 2020. The processor 2010 may call and execute a computer program from the memory 2020 to implement the method performed by the terminal device or network device in the embodiments of the present application. The memory 2020 may be a separate device independent of the processor 2010 or may be integrated into the processor 2010.

[0318] In one embodiment, the chip 2000 may further include an input interface 2030. The processor 2010 may control the input interface 2030 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0319] In one embodiment, the chip 2000 may further include an output interface 2040. The processor 2010 may control the output interface 2040 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0320] In one embodiment, the chip can be applied to the terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the terminal device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0321] In one embodiment, the chip can be applied to the network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0322] The chips used in the terminal device and the network device can be the same chip or different chips. It should be understood that the chip mentioned in the embodiment of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip.

[0323] The processor mentioned above may be a general-purpose processor, a digital signal processor (DSP), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or other programmable logic devices, transistor logic devices, discrete hardware components, etc. The general-purpose processor mentioned above may be a microprocessor or any conventional processor, etc.

[0324] The memory mentioned above may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. The non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM).

[0325] It should be understood that the above-mentioned memories are exemplary but not restrictive. For example, the memories in the embodiments of the present application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM RAM (DR RAM), etc. In other words, the memories in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0326] Figure 21 is a schematic block diagram of a communication system 2100 according to an embodiment of the present application. The communication system 2100 includes a terminal device 2110 and a network device 2120. The terminal device 2110 is configured to execute the above-mentioned communication method; the network device 2120 is configured to execute the above-mentioned communication method.

[0327] The terminal device 2110 can be used to implement the corresponding functions implemented by the terminal device in the above method, and the network device 2120 can be used to implement the corresponding functions implemented by the network device in the above method. For the sake of brevity, they will not be described in detail here.

[0328] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function in accordance with the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode to another website, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center integrated with one or more available media. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0329] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0330] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0331] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included within the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A communication method, comprising: The terminal device determines whether to perform repeated transmission of the physical random access channel PRACH based on the first information; wherein the first information is obtained by processing by the terminal device.

2. The method according to claim 1, wherein The method further comprises: When it is determined to perform repeated transmission of PRACH, the terminal device performs repeated transmission of PRACH on multiple target transmission resources; wherein the number of the multiple target transmission resources is the same as the number of repeated transmissions of PRACH, and each of the multiple target transmission resources is used for one PRACH transmission.

3. The method according to claim 2, wherein: The terminal device determines, based on the first information, whether to perform repeated transmission of the PRACH, including: When the first information satisfies a first condition, the terminal device determines to perform repeated transmission of the PRACH.

4. The method according to claim 3, wherein: The first information includes a transmission result of the last transmission of the PRACH; The method further includes: when the transmission result of the last transmission of the PRACH is a transmission failure, the terminal device determines that the first condition is met.

5. The method according to claim 4, wherein The method further comprises one of the following: The terminal device determines, when transmitting the PRACH last time and not receiving a random access response RAR, that the transmission result of the last transmission PRACH is a transmission failure; When the terminal device transmits PRACH for the last time and does not receive a conflict resolution message, it determines that the transmission result of the last transmission PRACH is a transmission failure.

6. The method according to any one of claims 3 to 5, wherein: The first information includes a measurement result of the first downlink signal; The method further includes: the terminal device determining that a first condition is satisfied when a measurement result of the first downlink signal is less than a first threshold value.

7. The method according to claim 6, wherein: The first threshold value is preset, or determined by the terminal device, or configured by the network device.

8. The method according to claim 7, wherein: When the first threshold value is configured by the network device, it is carried by one of the following: feature combination preamble code; random access channel RACH public configuration parameters; message msg A public configuration parameters; beam failure recovery configuration; msg A configuration parameters in RACH public configuration parameters.

9. The method according to claim 7, wherein: When the first threshold value is determined by the terminal device, the first threshold value is determined based on the second threshold value; wherein, the second threshold value is configured by the network device.

10. The method according to any one of claims 3 to 6, wherein: The method further comprises: The terminal device receives second information; the second information is used by the terminal device to determine whether to perform repeated transmission of PRACH.

11. The method according to claim 10, wherein: When the first information satisfies a first condition, the terminal device determines to perform repeated transmission of the PRACH, including: The terminal device determines to perform repeated transmission of PRACH when the first information meets the first condition, the second information includes first indication information, and the first indication information is used to indicate the start of repeated transmission of PRACH.

12. The method according to claim 11, wherein When the value of the first indication information is the first value, it is used to indicate starting repeated transmission of the PRACH; Alternatively, when the PRACH transmission type included in the first indication information is a repeated transmission type, it is used to indicate starting repeated transmission of the PRACH.

13. The method according to any one of claims 10 to 12, wherein: When the first information satisfies a first condition, the terminal device determines to perform repeated transmission of the PRACH, including: The terminal device determines to perform repeated transmission of PRACH when the first information satisfies a first condition and the second information includes a first threshold value; wherein the first threshold value is a threshold value related to a measurement result of a downlink signal.

14. The method according to any one of claims 10 to 13, wherein: When the first information satisfies a first condition, the terminal device determines to perform repeated transmission of the PRACH, including: The terminal device determines to perform repeated transmission of PRACH when the first information satisfies the first condition and the value of the first parameter indicated by the second information is a valid value; wherein the value of the first parameter is used to determine the number of repeated transmissions of PRACH.

15. The method according to any one of claims 2 to 13, wherein: The number of repeated transmissions of the PRACH is related to a second parameter, where the second parameter is used to indicate the number of downlink signals associated with one transmission resource.

16. The method according to claim 15, wherein When the second parameter is not less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a first value, the first value being equal to M multiplied by the second parameter; wherein M is the number of second downlink signals, and M is a positive integer; A second value, where the second value is equal to M multiplied by the first preset value.

17. The method according to claim 15, wherein: When the second parameter is less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a third value; the third value is the sum of the number of one or more first available transmission resources associated with M second downlink signals in one mapping cycle; wherein M is a positive integer; A fourth value; the fourth value is equal to M multiplied by the second preset value.

18. The method according to claim 17, wherein The number of repeated transmissions of the PRACH is equal to the minimum value between the third value and the fourth value.

19. The method according to any one of claims 2 to 13, wherein: The method further comprises: The terminal device receives third information; the third information carries a fifth value, and the fifth value is used to determine the number of repeated transmissions of PRACH.

20. The method according to claim 14, wherein The value of the first parameter includes a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

21. The method according to claim 19 or 20, wherein The number of repeated transmissions of the PRACH is equal to the fifth value.

22. The method according to claim 19 or 20, wherein The number of repeated transmissions of the PRACH is equal to the product of the fifth value and the sixth value.

23. The method according to claim 22, wherein The sixth value is configured or preset by the network device.

24. The method according to claim 22, wherein The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; The sixth value is one of the following: when the second parameter is not less than 1, it is equal to the first preset value; when the second parameter is not less than 1, it is equal to the second parameter.

25. The method according to claim 22, wherein The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; the sixth value is one of the following: When the second parameter is less than 1, it is equal to M multiplied by a second preset value; wherein M is the number of second downlink signals, and M is a positive integer; When the second parameter is less than 1, it is equal to M multiplied by the reciprocal of the second parameter; When the second parameter is less than 1, it is equal to M.

26. The method according to claim 22, wherein The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; and the fifth value is the number of mapping cycles occupied by repeated transmission of the PRACH.

27. The method according to claim 26, wherein When the second parameter is less than 1, the sixth value is equal to the sum of the number of the one or more first available transmission resources respectively associated with the M second downlink signals in one mapping cycle.

28. The method according to claim 26, wherein When the second parameter is not less than 1, the sixth value is equal to the number of one or more second available transmission resources within a mapping cycle; wherein each of the one or more second available transmission resources is associated with one or more second downlink signals among the M second downlink signals.

29. The method according to any one of claims 16-18, 21-25, wherein: The multiple target transmission resources include: multiple transmission resources that are continuous within one or more mapping cycles.

30. The method according to any one of claims 17, 18, 21-23, and 25, wherein: The multiple target transmission resources include: in one or more mapping cycles, one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle.

31. The method according to any one of claims 16, 21, 22, and 24, wherein: The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in one or more mapping cycles; wherein each second available transmission resource in the one or more second available transmission resources is associated with one or more second downlink signals in M ​​second downlink signals.

32. The method of claim 27, wherein: The multiple target transmission resources include: one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in the fifth mapping cycle.

33. The method of claim 28, wherein: The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in the fifth mapping cycle.

34. The method according to any one of claims 29, 30, and 32, wherein: The starting target transmission resource among the multiple target transmission resources is the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; In the first mapping cycle, a first first available transmission resource associated with a first second downlink signal among the M second downlink signals is one of the following: In the first mapping cycle, a first available transmission resource associated with a first second downlink signal among the M second downlink signals; In the first mapping cycle, a first available transmission resource in the transmission resource subset associated with a first second downlink signal among the M second downlink signals; In the first mapping cycle, the designated transmission resource associated with the first second downlink signal among the M second downlink signals.

35. The method according to any one of claims 29, 31, and 33, wherein: The starting target transmission resource among the multiple target transmission resources is the first second available transmission resource in the first mapping cycle.

36. The method according to any one of claims 17, 27, 30, and 32, wherein: When the second parameter is less than 1, the one or more first available transmission resources associated with each of the M second downlink signals in one mapping cycle include one of the following: one or more available transmission resources associated with each of the M second downlink signals in the one mapping cycle; a designated transmission resource associated with each of the M second downlink signals in the one mapping cycle; available transmission resources in a transmission resource subset associated with each of the M second downlink signals in the one mapping cycle; The available transmission resources between the starting available transmission resources and the ending available transmission resources associated with each of the M second downlink signals within the one mapping cycle; wherein, the starting available transmission resources and / or the ending available transmission resources associated with each second downlink signal are the designated transmission resources associated with each second downlink signal.

37. The method according to claim 34 or 36, wherein The method further comprises: The terminal device receives fourth information; wherein, the fourth information is used to determine one or more available transmission resources associated with each of the M second downlink signals within a mapping cycle when the second parameter is less than 1.

38. The method of claim 37, wherein: The fourth information includes a bit map; the bit map is used to indicate one or more available transmission resources associated with each of the M second downlink signals in a mapping cycle.

39. The method of claim 37, wherein: When the value of the fourth information is within the first value range, the fourth information is used to determine a transmission resource subset associated with each of the M second downlink signals in the one mapping cycle; And / or, when the value of the fourth information is within the second value range, it is used to determine the designated transmission resource associated with each of the M second downlink signals in the one mapping cycle.

40. The method according to any one of claims 28, 31, and 33, wherein: Within a mapping cycle, the one or more second available transmission resources include: within the one mapping cycle, an available transmission resource associated with each second downlink signal of the M second downlink signals; wherein, the one available transmission resource associated with each second downlink signal is determined based on the second parameter when the second parameter is not less than 1.

41. The method according to any one of claims 17, 26-38, wherein: The mapping cycle includes: transmission resources mapped to multiple downlink signals; the multiple downlink signals include the M second downlink signals.

42. The method according to any one of claims 17, 27, 28, 30-32, 34, 36-38, 40, and 41, wherein The M second downlink signals are downlink signals used by the terminal device.

43. The method according to claim 42, wherein The M second downlink signals are indicated by the fifth information.

44. The method of claim 42, wherein: The method further comprises: The terminal device selects the M second downlink signals from the multiple downlink signals based on the measurement results corresponding to the multiple downlink signals respectively; wherein M is configured by the network device or preset.

45. The method of claim 44, wherein: The selecting M second downlink signals from the multiple downlink signals includes one of the following: Selecting, from the multiple downlink signals, M second downlink signals with the largest measurement results; In a case where there is a downlink signal whose measurement result is greater than the first threshold value among the multiple downlink signals, M second downlink signals are determined based on the downlink signal whose measurement result is greater than the first threshold value.

46. ​​The method according to any one of claims 6, 13, 15-18, 23, 25-28, 30-34, 36-45, wherein The downlink signal includes: a synchronization signal block SSB, or a channel state information reference signal CSI-RS.

47. The method according to any one of claims 2 to 46, wherein: The transmission resource is a PRACH opportunity.

48. The method according to any one of claims 2 to 47, wherein: In the case of repeated transmission of PRACH, the PRACH carries a first type of preamble code; the first type of preamble code is a preamble code used when repeated transmission of PRACH is performed; the first type of preamble code is preset or configured by a network device.

49. A communication method comprising: The network device receives a physical random access channel PRACH; wherein, whether the PRACH is a repeated transmission is determined by the terminal device based on first information, and the first information is obtained by processing by the terminal device.

50. The method of claim 49, wherein The network device receiving the PRACH includes: The network device receives repeatedly transmitted PRACH on multiple target transmission resources; wherein the number of the multiple target transmission resources is the same as the number of repeated transmissions of PRACH, and each of the multiple target transmission resources is used to receive PRACH once.

51. The method of claim 50, wherein: The network device receives repeatedly transmitted PRACHs on multiple target transmission resources, including: The network device receives the PRACH sent by the terminal device and parses the preamble carried in the PRACH; In the case where the preamble carried by the PRACH is a first type of preamble, the network device determines that the terminal device performs repeated transmission of the PRACH, and the network device receives the PRACH repeatedly transmitted by the terminal device on the multiple target transmission resources; wherein, the first type of preamble is a preamble used by the terminal device when performing repeated transmission of the PRACH; the first type of preamble is preset, or the network device is configured for the terminal device.

52. The method of claim 51, wherein The method further comprises: The network device configures a first threshold value for the terminal device through one of the following: feature combination preamble code; random access channel RACH public configuration parameters; message msg A public configuration parameters; beam failure recovery configuration; msg A dedicated configuration parameters in the RACH public configuration parameters.

53. The method of claim 51, wherein The method further includes: the network device configuring a second threshold value for the terminal device, where the second threshold value is used by the terminal device to determine the first threshold value.

54. The method of claim 51, wherein The method further comprises: The network device sends second information to the terminal device; the second information is used by the terminal device to determine whether to perform repeated transmission of PRACH.

55. The method of claim 54, wherein The second information includes first indication information; When the value of the first indication information is the first value, it is used to indicate the start of repeated transmission of PRACH; or when the transmission type of PRACH included in the first indication information is the repeated transmission type, it is used to indicate the start of repeated transmission of PRACH.

56. The method according to claim 54 or 55, wherein The second information includes a first threshold value; wherein the first threshold value is a threshold value related to the measurement result of the downlink signal.

57. The method according to any one of claims 54 to 56, wherein: The second information is used to indicate the value of the first parameter, and the value of the first parameter is used by the terminal device to determine the number of repeated transmissions of PRACH.

58. The method according to any one of claims 51 to 56, wherein: The number of repeated transmissions of the PRACH is related to a second parameter, where the second parameter is used to indicate the number of downlink signals associated with one transmission resource.

59. The method of claim 58, wherein When the second parameter is not less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a first value, which is equal to M multiplied by the second parameter; where M is the number of second downlink signals, and M is a positive integer; a second value, which is equal to M multiplied by a first preset value.

60. The method of claim 58, wherein When the second parameter is less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a third value; the third value is the sum of the number of one or more first available transmission resources associated with M second downlink signals in a mapping cycle; where M is a positive integer; a fourth value; the fourth value is equal to M multiplied by the second preset value.

61. The method of claim 60, wherein: The number of repeated transmissions of the PRACH is equal to the minimum value between the third value and the fourth value.

62. The method according to any one of claims 51 to 56, wherein: The method further includes: the network device sending third information to the terminal device, the third information carrying a fifth value, and the fifth value being used to determine the number of repeated transmissions of the PRACH.

63. The method of claim 57, wherein: The value of the first parameter includes a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

64. The method according to claim 62 or 63, wherein The number of repeated transmissions of the PRACH is equal to the fifth value.

65. The method according to claim 62 or 63, wherein The number of repeated transmissions of the PRACH is equal to the product of the fifth value and the sixth value.

66. The method of claim 65, wherein The sixth value is configured or preset by the network device for the terminal device.

67. The method of claim 65, wherein The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; the sixth value is one of the following: when the second parameter is not less than 1, it is equal to the first preset value; when the second parameter is not less than 1, it is equal to the second parameter.

68. The method of claim 65, wherein The sixth value is related to the second parameter; wherein, the second parameter is used to represent the number of downlink signals associated with a transmission resource; the sixth value is one of the following: when the second parameter is less than 1, it is equal to M multiplied by a second preset value; wherein M is the number of second downlink signals, and M is a positive integer; when the second parameter is less than 1, it is equal to M multiplied by the reciprocal of the second parameter; when the second parameter is less than 1, it is equal to M.

69. The method of claim 65, wherein The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; and the fifth value is the number of mapping cycles occupied by repeated transmission of the PRACH.

70. The method of claim 69, wherein When the second parameter is less than 1, the sixth value is equal to the sum of the number of the one or more first available transmission resources respectively associated with the M second downlink signals in one mapping cycle.

71. The method of claim 69, wherein When the second parameter is not less than 1, the sixth value is equal to the number of one or more second available transmission resources within a mapping cycle; wherein each of the one or more second available transmission resources is associated with one or more second downlink signals among the M second downlink signals.

72. The method according to any one of claims 59-61, 64-68, wherein The multiple target transmission resources include: multiple transmission resources that are continuous within one or more mapping cycles.

73. The method according to any one of claims 60, 61, 64-66, and 68, wherein: The multiple target transmission resources include: in one or more mapping cycles, one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle.

74. The method according to any one of claims 59, 64, 65, and 67, wherein: The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in one or more mapping cycles; wherein each second available transmission resource in the one or more second available transmission resources is associated with one or more second downlink signals in M ​​second downlink signals.

75. The method of claim 70, wherein The multiple target transmission resources include: one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in the fifth numerical mapping cycle.

76. The method of claim 71, wherein The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in the fifth mapping cycle.

77. The method according to any one of claims 72, 73, and 75, wherein: The starting target transmission resource among the multiple target transmission resources is the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; wherein, the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle is one of the following: the first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; the first available transmission resource in the transmission resource subset associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; the designated transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle.

78. The method according to any one of claims 72, 74, and 76, wherein: The starting target transmission resource among the multiple target transmission resources is the first second available transmission resource in the first mapping cycle.

79. The method according to any one of claims 60, 70, 73, 75, and 77, wherein: The method further comprises: The network device sends fourth information to the terminal device, wherein the fourth information is used by the terminal device to determine one or more available transmission resources associated with each of the M second downlink signals within a mapping cycle when the second parameter is less than 1.

80. The method of claim 79, wherein The fourth information includes a bit map; the bit map is used to indicate one or more available transmission resources associated with each of the M second downlink signals in a mapping cycle.

81. The method of claim 79, wherein When the value of the fourth information is within the first value range, the terminal device is used to determine the transmission resource subset associated with each second downlink signal in the M second downlink signals in the one mapping cycle; And / or, when the value of the fourth information is within the second value range, the terminal device is used to determine the designated transmission resource associated with each of the M second downlink signals in the one mapping cycle.

82. The method according to any one of claims 60, 69-81, wherein The mapping cycle includes: transmission resources mapped to multiple downlink signals; the multiple downlink signals include the M second downlink signals.

83. The method according to any one of claims 60, 70, 71, 73-77, 79-82, wherein The method further comprises: The network device sends fifth information to the terminal device, where the fifth information is used to indicate M second downlink signals.

84. The method according to any one of claims 52, 56-60, 66, 68, 70, 71, 73-77, 79-82, wherein The downlink signal includes: a synchronization signal block SSB, or a channel state information reference signal CSI-RS.

85. The method according to any one of claims 50 to 84, wherein: The transmission resource is a PRACH opportunity.

86. A terminal device comprising: The first processing unit is used to determine whether to repeat the transmission of the physical random access channel PRACH based on the first information; wherein the first information is obtained by processing the terminal device.

87. The terminal device according to claim 86, wherein: The first processing unit is used to perform repeated transmission of PRACH on multiple target transmission resources when it is determined to perform repeated transmission of PRACH; wherein the number of the multiple target transmission resources is the same as the number of repeated transmissions of PRACH, and each of the multiple target transmission resources is used for one PRACH transmission.

88. The terminal device according to claim 87, wherein: The first processing unit is configured to determine to perform repeated transmission of the PRACH when the first information satisfies a first condition.

89. The terminal device according to claim 88, wherein: The first information includes a transmission result of a previous transmission of the PRACH; the first processing unit is configured to determine that a first condition is satisfied when the transmission result of the previous transmission of the PRACH is a transmission failure.

90. The terminal device according to claim 89, wherein: The first processing unit is used to perform one of the following: when the last PRACH transmission was performed and no random access response RAR was received, determining that the transmission result of the last PRACH transmission was a transmission failure; when the last PRACH transmission was performed and no conflict resolution message was received, determining that the transmission result of the last PRACH transmission was a transmission failure.

91. The terminal device according to any one of claims 88 to 90, wherein: The first information includes a measurement result of a first downlink signal; and the first processing unit is configured to determine that a first condition is satisfied when the measurement result of the first downlink signal is less than a first threshold value.

92. The terminal device according to claim 91, wherein: The first threshold value is preset, or determined by the terminal device, or configured by the network device.

93. The terminal device according to claim 92, wherein: When the first threshold value is configured by the network device, it is carried by one of the following: feature combination preamble code; random access channel RACH public configuration parameters; message msg A public configuration parameters; beam failure recovery configuration; msg A configuration parameters in RACH public configuration parameters.

94. The terminal device according to claim 92, wherein: When the first threshold value is determined by the terminal device, the first threshold value is determined based on the second threshold value; wherein, the second threshold value is configured by the network device.

95. The terminal device according to any one of claims 88 to 91, wherein: The terminal device further includes: The first communication unit is used to receive second information; the second information is used by the terminal device to determine whether to perform repeated transmission of PRACH.

96. The terminal device according to claim 95, wherein: The first processing unit is configured to determine to perform repeated transmission of the PRACH when the first information satisfies a first condition, the second information includes first indication information, and the first indication information is used to indicate starting repeated transmission of the PRACH.

97. The terminal device according to claim 96, wherein: When the value of the first indication information is the first value, it is used to indicate the start of repeated transmission of PRACH; or when the transmission type of PRACH included in the first indication information is the repeated transmission type, it is used to indicate the start of repeated transmission of PRACH.

98. The terminal device according to any one of claims 95 to 97, wherein: The first processing unit is configured to determine to perform repeated transmission of the PRACH when the second information includes a first threshold value and the first information satisfies a first condition; wherein the first threshold value is a threshold value related to a measurement result of a downlink signal.

99. The terminal device according to any one of claims 95 to 98, wherein: The first processing unit is used to determine the repeated transmission of PRACH when the first information meets the first condition and the value of the first parameter indicated by the second information is a valid value; wherein the value of the first parameter is used to determine the number of repeated transmissions of PRACH.

100. The terminal device according to any one of claims 87 to 98, wherein: The number of repeated transmissions of the PRACH is related to a second parameter, where the second parameter is used to indicate the number of downlink signals associated with one transmission resource.

101. The terminal device according to claim 100, wherein: When the second parameter is not less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a first value, which is equal to M multiplied by the second parameter; where M is the number of second downlink signals, and M is a positive integer; a second value, which is equal to M multiplied by a first preset value.

102. The terminal device according to claim 100, wherein: When the second parameter is less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a third value; the third value is the sum of the number of one or more first available transmission resources associated with M second downlink signals in a mapping cycle; where M is a positive integer; a fourth value; the fourth value is equal to M multiplied by the second preset value.

103. The terminal device according to claim 102, wherein: The number of repeated transmissions of the PRACH is equal to the minimum value between the third value and the fourth value.

104. The terminal device according to any one of claims 87 to 98, wherein: The terminal device further includes: a first communication unit, configured to receive third information, wherein the third information carries a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

105. The terminal device according to claim 99, wherein: The value of the first parameter includes a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

106. The terminal device according to claim 104 or 105, wherein: The number of repeated transmissions of the PRACH is equal to the fifth value.

107. The terminal device according to claim 104 or 105, wherein: The number of repeated transmissions of the PRACH is equal to the product of the fifth value and the sixth value.

108. The terminal device according to claim 107, wherein: The sixth value is configured or preset by the network device.

109. The terminal device according to claim 107, wherein: The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; The sixth value is one of the following: when the second parameter is not less than 1, it is equal to the first preset value; when the second parameter is not less than 1, it is equal to the second parameter.

110. The terminal device according to claim 107, wherein: The sixth value is related to the second parameter; wherein, the second parameter is used to represent the number of downlink signals associated with a transmission resource; the sixth value is one of the following: when the second parameter is less than 1, it is equal to M multiplied by a second preset value; wherein M is the number of second downlink signals, and M is a positive integer; when the second parameter is less than 1, it is equal to M multiplied by the reciprocal of the second parameter; when the second parameter is less than 1, it is equal to M.

111. The terminal device according to claim 107, wherein: The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; and the fifth value is the number of mapping cycles occupied by repeated transmission of the PRACH.

112. The terminal device according to claim 111, wherein: When the second parameter is less than 1, the sixth value is equal to the sum of the number of the one or more first available transmission resources respectively associated with the M second downlink signals in one mapping cycle.

113. The terminal device according to claim 111, wherein: When the second parameter is not less than 1, the sixth value is equal to the number of one or more second available transmission resources within a mapping cycle; wherein each of the one or more second available transmission resources is associated with one or more second downlink signals among the M second downlink signals.

114. The terminal device according to any one of claims 101-103, 106-110, wherein: The multiple target transmission resources include: multiple transmission resources that are continuous within one or more mapping cycles.

115. The terminal device according to any one of claims 102, 103, 106-108, and 110, wherein: The multiple target transmission resources include: in one or more mapping cycles, one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle.

116. The terminal device according to any one of claims 101, 106, 107, and 109, wherein: The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in one or more mapping cycles; wherein each second available transmission resource in the one or more second available transmission resources is associated with one or more second downlink signals in M ​​second downlink signals.

117. The terminal device according to claim 112, wherein: The multiple target transmission resources include: one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in the fifth mapping cycle.

118. The terminal device according to claim 113, wherein: The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in the fifth mapping cycle.

119. The terminal device according to any one of claims 114, 115, and 117, wherein: The starting target transmission resource among the multiple target transmission resources is the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; wherein, the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle is one of the following: the first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; the first available transmission resource in the transmission resource subset associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; the designated transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle.

120. The terminal device according to any one of claims 114, 116, and 118, wherein: The starting target transmission resource among the multiple target transmission resources is the first second available transmission resource in the first mapping cycle.

121. The terminal device according to any one of claims 102, 112, 115, and 117, wherein: When the second parameter is less than 1, the one or more first available transmission resources associated with each of the M second downlink signals in a mapping cycle include one of the following: one or more available transmission resources associated with each of the M second downlink signals in the mapping cycle; designated transmission resources associated with each of the M second downlink signals in the mapping cycle; available transmission resources in a subset of transmission resources associated with each of the M second downlink signals in the mapping cycle; available transmission resources between the starting available transmission resource and the ending available transmission resource associated with each of the M second downlink signals in the mapping cycle; wherein, the starting available transmission resource and / or the ending available transmission resource associated with each second downlink signal is the designated transmission resource associated with each second downlink signal.

122. The terminal device according to claim 119 or 121, wherein: The terminal device further includes: The first communication unit is configured to receive fourth information; wherein, the fourth information is used to determine one or more available transmission resources associated with each of the M second downlink signals within a mapping cycle when the second parameter is less than 1.

123. The terminal device according to claim 122, wherein: The fourth information includes a bit map; the bit map is used to indicate one or more available transmission resources associated with each of the M second downlink signals in a mapping cycle.

124. The terminal device according to claim 122, wherein: When the value of the fourth information is within the first value range, the fourth information is used to determine a transmission resource subset associated with each of the M second downlink signals in the one mapping cycle; And / or, when the value of the fourth information is within the second value range, it is used to determine the designated transmission resource associated with each of the M second downlink signals in the one mapping cycle.

125. The terminal device according to any one of claims 113, 116, and 118, wherein: Within a mapping cycle, the one or more second available transmission resources include: within the one mapping cycle, an available transmission resource associated with each second downlink signal of the M second downlink signals; wherein, the one available transmission resource associated with each second downlink signal is determined based on the second parameter when the second parameter is not less than 1.

126. The terminal device according to any one of claims 102, 111-125, wherein: The mapping cycle includes: transmission resources mapped to multiple downlink signals; the multiple downlink signals include the M second downlink signals.

127. The terminal device according to any one of claims 102, 112, 113, 115-117, 119, 121-126, wherein: The M second downlink signals are downlink signals used by the terminal device.

128. The terminal device according to claim 127, wherein: The M second downlink signals are indicated by the fifth information.

129. The terminal device according to claim 127, wherein: The first processing unit is configured to select the M second downlink signals from the multiple downlink signals based on measurement results corresponding to the multiple downlink signals respectively; wherein M is configured by the network device or preset.

130. The terminal device according to claim 129, wherein: The first processing unit is used to perform one of the following: selecting M second downlink signals with the largest measurement results from the multiple downlink signals; and determining M second downlink signals based on the downlink signal with a measurement result greater than the first threshold value when there is a downlink signal among the multiple downlink signals.

131. The terminal device according to any one of claims 91, 98, 100-102, 109-113, 115-117, 119, and 121-130, wherein: The downlink signal includes: a synchronization signal block SSB, or a channel state information reference signal CSI-RS.

132. The terminal device according to any one of claims 87 to 131, wherein: The transmission resource is a PRACH opportunity.

133. The terminal device according to any one of claims 87 to 132, wherein: In the case of repeated transmission of PRACH, the PRACH is used to carry a first type of preamble code; the first type of preamble code is a preamble code used when repeatedly transmitting PRACH; the first type of preamble code is preset or configured by a network device.

134. A network device comprising: The second communication unit is used to receive a physical random access channel PRACH; wherein, whether the PRACH is a repeated transmission is determined by the terminal device based on first information, and the first information is obtained by processing by the terminal device.

135. The network device according to claim 134, wherein: The second communication unit is used to receive repeatedly transmitted PRACH on multiple target transmission resources; wherein the number of the multiple target transmission resources is the same as the number of repeated transmissions of PRACH, and each of the multiple target transmission resources is used to receive PRACH once.

136. The network device according to claim 135, wherein The network device further includes: The second processing unit is used to parse the preamble carried in the PRACH after receiving the PRACH sent by the terminal device; when the preamble carried by the PRACH is a first-type preamble, the network device determines that the terminal device performs repeated transmission of the PRACH, and receives the PRACH repeatedly transmitted by the terminal device on the multiple target transmission resources through the second communication unit; wherein the first-type preamble is the preamble used by the terminal device when performing repeated transmission of the PRACH; the first-type preamble is preset, or the network device is configured for the terminal device.

137. The network device according to claim 136, wherein: The second communication unit is used to configure a first threshold value for the terminal device through one of the following: feature combination preamble code; random access channel RACH public configuration parameters; message msg A public configuration parameters; beam failure recovery configuration; msg A special configuration parameters in the RACH public configuration parameters.

138. The network device according to claim 136, wherein: The second communication unit is used to configure a second threshold value for the terminal device, and the second threshold value is used by the terminal device to determine the first threshold value.

139. The network device according to claim 136, wherein: The second communication unit is used to send second information to the terminal device; the second information is used by the terminal device to determine whether to perform repeated transmission of PRACH.

140. The network device according to claim 139, wherein The second information includes first indication information; When the value of the first indication information is the first value, it is used to indicate the start of repeated transmission of PRACH; or when the transmission type of PRACH included in the first indication information is the repeated transmission type, it is used to indicate the start of repeated transmission of PRACH.

141. The network device according to claim 139 or 140, wherein: The second information includes a first threshold value; wherein the first threshold value is a threshold value related to the measurement result of the downlink signal.

142. The network device according to any one of claims 139 to 141, wherein: The second information is used to indicate the value of the first parameter, and the value of the first parameter is used by the terminal device to determine the number of repeated transmissions of PRACH.

143. The network device according to any one of claims 136 to 141, wherein: The number of repeated transmissions of the PRACH is related to a second parameter, where the second parameter is used to indicate the number of downlink signals associated with one transmission resource.

144. The network device according to claim 143, wherein When the second parameter is not less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a first value, which is equal to M multiplied by the second parameter; where M is the number of second downlink signals, and M is a positive integer; a second value, which is equal to M multiplied by a first preset value.

145. The network device according to claim 143, wherein When the second parameter is less than 1, the number of repeated transmissions of the PRACH is equal to one of the following: a third value; the third value is the sum of the number of one or more first available transmission resources associated with M second downlink signals in a mapping cycle; where M is a positive integer; a fourth value; the fourth value is equal to M multiplied by the second preset value.

146. The network device according to claim 145, wherein The number of repeated transmissions of the PRACH is equal to the minimum value between the third value and the fourth value.

147. The network device according to any one of claims 136 to 141, wherein: The second communication unit is used to send third information to the terminal device, where the third information carries a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

148. The network device according to claim 142, wherein The value of the first parameter includes a fifth value, and the fifth value is used to determine the number of repeated transmissions of the PRACH.

149. The network device according to claim 147 or 148, wherein: The number of repeated transmissions of the PRACH is equal to the fifth value.

150. The network device according to claim 147 or 148, wherein: The number of repeated transmissions of the PRACH is equal to the product of the fifth value and the sixth value.

151. The network device according to claim 150, wherein The sixth value is configured or preset by the network device for the terminal device.

152. The network device according to claim 150, wherein The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; the sixth value is one of the following: when the second parameter is not less than 1, it is equal to the first preset value; when the second parameter is not less than 1, it is equal to the second parameter.

153. The network device according to claim 150, wherein The sixth value is related to the second parameter; wherein, the second parameter is used to represent the number of downlink signals associated with a transmission resource; the sixth value is one of the following: when the second parameter is less than 1, it is equal to M multiplied by a second preset value; wherein M is the number of second downlink signals, and M is a positive integer; when the second parameter is less than 1, it is equal to M multiplied by the reciprocal of the second parameter; when the second parameter is less than 1, it is equal to M.

154. The network device according to claim 150, wherein The sixth value is related to the second parameter; wherein the second parameter is used to represent the number of downlink signals associated with a transmission resource; and the fifth value is the number of mapping cycles occupied by repeated transmission of the PRACH.

155. The network device according to claim 154, wherein When the second parameter is less than 1, the sixth value is equal to the sum of the number of the one or more first available transmission resources respectively associated with the M second downlink signals in one mapping cycle.

156. The network device according to claim 154, wherein When the second parameter is not less than 1, the sixth value is equal to the number of one or more second available transmission resources within a mapping cycle; wherein each of the one or more second available transmission resources is associated with one or more second downlink signals among the M second downlink signals.

157. The network device according to any one of claims 144-146, 149-153, wherein: The multiple target transmission resources include: multiple transmission resources that are continuous within one or more mapping cycles.

158. The network device according to any one of claims 145, 146, 149-151, and 153, wherein: The multiple target transmission resources include: in one or more mapping cycles, one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle.

159. The network device according to any one of claims 144, 149, 150, and 152, wherein: The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in one or more mapping cycles; wherein each second available transmission resource in the one or more second available transmission resources is associated with one or more second downlink signals in M ​​second downlink signals.

160. The network device according to claim 155, wherein The multiple target transmission resources include: one or more first available transmission resources associated with each second downlink signal in the M second downlink signals in each mapping cycle in the fifth numerical mapping cycle.

161. The network device according to claim 156, wherein The multiple target transmission resources include: one or more second available transmission resources in each mapping cycle in the fifth mapping cycle.

162. The network device according to any one of claims 157, 158, and 160, wherein: The starting target transmission resource among the multiple target transmission resources is the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; wherein, the first first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle is one of the following: the first available transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; the first available transmission resource in the transmission resource subset associated with the first second downlink signal among the M second downlink signals in the first mapping cycle; the designated transmission resource associated with the first second downlink signal among the M second downlink signals in the first mapping cycle.

163. The network device according to any one of claims 157, 159, and 161, wherein: The starting target transmission resource among the multiple target transmission resources is the first second available transmission resource in the first mapping cycle.

164. The network device according to any one of claims 145, 155, 157, 159, and 161, wherein: The second communication unit is used to send fourth information to the terminal device, wherein the fourth information is used by the terminal device to determine one or more available transmission resources associated with each of the M second downlink signals within a mapping cycle when the second parameter is less than 1.

165. The network device according to claim 164, wherein The fourth information includes a bit map; the bit map is used to indicate one or more available transmission resources associated with each of the M second downlink signals in a mapping cycle.

166. The network device according to claim 164, wherein When the value of the fourth information is within the first value range, the terminal device is used to determine the transmission resource subset associated with each second downlink signal in the M second downlink signals in the one mapping cycle; And / or, when the value of the fourth information is within the second value range, the terminal device is used to determine the designated transmission resource associated with each of the M second downlink signals in the one mapping cycle.

167. The network device according to any one of claims 145, 154-166, wherein: The mapping cycle includes: transmission resources mapped to multiple downlink signals; the multiple downlink signals include the M second downlink signals.

168. The network device according to any one of claims 145, 155, 156, 158-162, 164-167, wherein: The second communication unit is used to send fifth information to the terminal device, and the fifth information is used to indicate M second downlink signals.

169. The network device according to any one of claims 137, 141, 143-145, 152-156, 158-168, wherein: The downlink signal includes: a synchronization signal block SSB, or a channel state information reference signal CSI-RS.

170. The network device according to any one of claims 135 to 169, wherein: The transmission resource is a PRACH opportunity.

171. A terminal device comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory so that the terminal device executes the method as claimed in any one of claims 1 to 48.

172. A network device comprising: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory so as to enable the network device to perform the method as claimed in any one of claims 49 to 85.

173. A chip comprising: A processor, configured to call and execute a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 48 or 49 to 85.

174. A computer-readable storage medium for storing a computer program, which, when executed by a device, causes the device to perform the method according to any one of claims 1 to 48, or 49 to 85.

175. A computer program product comprising computer program instructions for causing a computer to perform the method of any one of claims 1 to 48, or 49 to 85.

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