Method and apparatus in a node for wireless communication

Abstract

The present application provides a method and apparatus in a node for wireless communication. The method includes: transmitting a first PRACH transmission on a first RO set; wherein, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are continuous in the time domain, a first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency domain resource index, each RO set in the plurality of RO sets includes Nr ROs, a first time offset is a time offset between any two adjacent RO sets in the plurality of RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine a starting RO in the first RO set.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and more particularly, to a method and apparatus in a node for wireless communication. Background Art

[0002] To enhance the coverage performance of random access, some communication systems (such as the new radio (NR) system) plan to introduce physical random access channel (PRACH) transmissions with multiple preamble repetitions. In some random access mechanisms (e.g., contention-free random access (CFRA)), the starting physical random access channel occasion (PRACH occasion, RO) in the PRACH occasion set (PRACH occasion set, ROSet, also referred to as the RO set) occupied by multiple preamble repetitions is usually determined according to the PRACH mask index, thereby determining the PRACH occasion set.

[0003] However, the PRACH mask index may not be able to indicate all RO sets. Moreover, the RO sets indicated by the PRACH mask index may also conflict with PRACH transmissions of other random access mechanisms. Therefore, how to effectively indicate the RO set through the PRACH mask index is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a method and apparatus in a node for wireless communication. The following introduces various aspects involved in this application.

[0005] In a first aspect, a method in a first node for wireless communication is provided, including: sending a first PRACH transmission on a first RO set; wherein, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are continuous in the time domain, a first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency domain resource index, each RO set in the plurality of RO sets includes Nr ROs, a first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine the starting RO in the first RO set.

[0006] In a second aspect, a method in a second node for wireless communication is provided, including: receiving a first PRACH transmission on a first RO set; wherein, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are consecutive in the time domain, a first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency-domain resource index, each RO set in the plurality of RO sets includes Nr ROs, a first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine a starting RO in the first RO set.

[0007] In a third aspect, a first node for wireless communication is provided, characterized by including: a first transceiver, configured to send a first PRACH transmission on a first RO set; wherein, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are consecutive in the time domain, a first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency-domain resource index, each RO set in the plurality of RO sets includes Nr ROs, a first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine a starting RO in the first RO set.

[0008] Fourth aspect, there is provided a second node for wireless communication, characterized by comprising: a second transceiver, configured to receive a first PRACH transmission on a first RO set; wherein, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are consecutive in the time domain, a first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency domain resource index, each RO set in the plurality of RO sets includes Nr ROs, a first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine the starting RO in the first RO set.

[0009] Fifth aspect, there is provided a first node for wireless communication, comprising a transceiver, a memory, and a processor, the memory is configured to store a program, the processor is configured to call the program in the memory and control the transceiver to receive or transmit signals, so that the first node executes the method as described in the first aspect.

[0010] Sixth aspect, there is provided a second node for wireless communication, comprising a transceiver, a memory, and a processor, the memory is configured to store a program, the processor is configured to call the program in the memory and control the transceiver to receive or transmit signals, so that the second node executes the method as described in the second aspect.

[0011] Seventh aspect, embodiments of the present application provide a communication system, which includes the first node and / or the second node as described above. In another possible design, the system may further include other devices that interact with the first node or the second node in the solutions provided by the embodiments of the present application.

[0012] Eighth aspect, embodiments of the present application provide a computer-readable storage medium, the computer-readable storage medium stores a computer program, and the computer program enables a computer to execute some or all of the steps in the methods of the above aspects.

[0013] Ninth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to enable a computer to execute some or all of the steps in the methods of the above aspects. In some implementations, the computer program product may be a software installation package.

[0014] Tenth aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0015] In an embodiment of the present application, the first node sends a first PRACH transmission on a first RO set among multiple RO sets. The starting RO in the first RO set is determined according to whether the first time offset related to the multiple RO sets is configured, which can reduce or avoid conflicts with the PRACH transmission of the contention-based random access (CBRA) mechanism.

[0016] In an embodiment of the present application, based on the PRACH mask index indicating the starting RO, the first node can further determine the initial RO in the first RO set according to the configuration of the first time offset, increasing the flexibility of the PRACH mask index indicating the RO set.

[0017] In an embodiment of the present application, the first PRACH transmission sent by the first node on the first RO set includes Nr preamble repetitions. Nr is a positive integer greater than 1. Thus, the first node can optimize the resource allocation of the PRACH transmission with multiple preamble repetitions.

[0018] In an embodiment of the present application, the first RO set where the starting RO determined by the first node is located is used to send the first PRACH transmission with multiple preamble repetitions, which not only helps to improve the performance gain of the PRACH transmission and increase the coverage range, but also helps to reduce the random access delay and improve the random access resource utilization efficiency. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the system architecture of a wireless communication system to which the embodiments of the present application can be applied.

[0020] Figure 2 It is a schematic diagram of an implementation manner for determining the starting RO of the RO set according to the PRACH mask index.

[0021] Figure 3 It is a schematic diagram of another implementation manner for determining the starting RO of the RO set according to the PRACH mask index.

[0022] Figure 4 It is a schematic diagram of the time offset corresponding to different numbers of preamble repetitions.

[0023] Figure 5 It is a schematic flowchart of a method in a first node for wireless communication provided by an embodiment of the present application.

[0024] Figure 6 For Figure 5 Schematic diagrams of several possible preamble formats corresponding to preamble repetitions in the method shown.

[0025] Figure 7 For Figure 5 Schematic diagram of the first time offset in the method shown.

[0026] Figure 8 For Figure 5 Schematic diagram of a possible implementation manner of the method shown.

[0027] Figure 9 For Figure 5 Schematic diagram of another possible implementation manner of the method shown.

[0028] Figure 10 For Figure 5 Schematic diagram of yet another possible implementation manner of the method shown.

[0029] Figure 11 For Figure 5 Schematic flowchart of a possible implementation manner of the method shown.

[0030] Figure 12 Schematic diagram of the structure of the first node for wireless communication provided by an embodiment of the present application.

[0031] Figure 13 Schematic diagram of the structure of the second node for wireless communication provided by an embodiment of the present application.

[0032] Figure 14 Schematic structural diagram of the device provided by an embodiment of the present application.

[0033] Figure 15 Schematic diagram of the hardware module of the communication device provided by an embodiment of the present application. Detailed implementation manners

[0034] Communication system architecture

[0035] Figure 1 It is a system architecture example diagram of a wireless communication system 100 to which the embodiments of the present application can be applied. The wireless communication system 100 may include a network device 110 and a user equipment (UE) 120. The network device 110 may be a device that communicates with the user equipment 120. The network device 110 may provide communication coverage for a specific geographical area and may communicate with the user equipment 120 located within the coverage area.

[0036] Figure 1Exemplarily, a network device and two user devices are shown. Optionally, the wireless communication system 100 may include multiple network devices, and the coverage range of each network device may include other numbers of user devices. The embodiments of the present application do not limit this.

[0037] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity. The embodiments of the present application do not limit this.

[0038] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: the fifth generation (5G) system or NR, the long term evolution (LTE) system, the LTE frequency division duplex (FDD) system, the LTE time division duplex (TDD), etc. The technical solutions provided by the present application can also be applied to future communication systems, such as the sixth generation mobile communication system, and also to satellite communication systems, etc.

[0039] The user equipment in the embodiments of the present application may also be referred to as a terminal device, an access terminal, a user unit, a user station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The user equipment in the embodiments of the present application may be a device that provides voice and / or data connectivity to users and can be used to connect people, objects, and machines. For example, it can be a handheld device with a wireless connection function, a vehicle-mounted device, etc. The user equipment in the embodiments of the present application may be a mobile phone, a tablet computer (Pad), a laptop computer, a handheld computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For instance, a cellular phone and a car communicate with each other using sidelink signals. A cellular phone communicates with a smart home device without relaying the communication signal through a base station.

[0040] The network device in the embodiments of the present application can be a device for communicating with a user equipment. This network device can also be referred to as an access network device or a radio access network device. For example, the network device can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) that connects the user equipment to a wireless network. The base station can be broadly covered by various names below, or replaced with the following names, such as: Node B, evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, base band unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, a modem or a chip disposed in the foregoing device or apparatus. The base station can also be a mobile switching center and a device that undertakes the base station function in device-to-device (D2D), vehicle-to-everything (V2X), machine-to-machine (M2M) communications, a network-side device in a 6G network, a device that undertakes the base station function in a future communication system, etc. The base station can support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the network device.

[0041] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the position of the mobile base station. In other examples, a helicopter or a drone can be configured to be a device for communicating with another base station.

[0042] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include an AAU.

[0043] The network device and the user equipment may be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they may also be deployed on water; and they may also be deployed on airplanes, balloons, and satellites in the air. The scenarios where the network device and the user equipment are located are not limited in the embodiments of the present application.

[0044] It should be understood that all or part of the functions of the communication device in the present application may also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform (such as a cloud platform).

[0045] It should be understood that the explanations of the terms in the embodiments of the present application may refer to the specification protocols of the 3rd generation partnership project (3GPP) series TS36, TS37, and TS38, but may also refer to the specification protocols of the Institute of Electrical and Electronics Engineers (IEEE).

[0046] For ease of understanding, some related technical knowledge involved in the embodiments of the present application will be introduced first. The following related 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. The embodiments of the present application include at least some of the following contents.

[0047] Coverage enhancement for PRACH transmission

[0048] The coverage performance of a communication system (such as an NR system) is an important factor that operators need to consider when commercially deploying a communication network because the coverage performance of the communication system will directly affect the service quality of the communication system and the costs of the operator, such as the operator's capital expenditure (CAPEX) and the operator's operating expense (OPEX), etc.

[0049] The coverage performance of a communication system will vary with the frequency band in which the communication system operates. For example, compared with the LTE system, the NR system can operate at a higher frequency band (for example, the millimeter wave band), which results in a greater path loss when the NR system operates at a higher frequency band, and thus results in a relatively poorer coverage performance of the NR system at a high frequency band. Therefore, as the frequency bands supported by the communication system may become higher and higher, how to enhance the coverage of the communication system becomes a problem that needs to be solved.

[0050] In most scenarios of actual deployment, the uplink (UL) coverage performance is the bottleneck for coverage enhancement of communication systems because the capabilities of user equipment are weaker than those of network equipment. With the development of communication technology, the uplink services in some emerging vertical use cases are gradually increasing, such as video uploading services. In scenarios with more uplink services, how to enhance uplink coverage is a problem that needs to be further solved.

[0051] In the related art, there are already technical solutions for coverage enhancement for some uplinks. For example, NR version 17 (Rel-17) has introduced coverage enhancement solutions for the physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH) and message 3 (Msg3) in the random access process.

[0052] However, Rel-17 did not design a coverage enhancement solution for PRACH, but PRACH transmission performance is very important for many processes such as initial access and beam failure recovery. Therefore, it is also very important to enhance the coverage of PRACH. Based on this, 3GPP proposed RP-221858 and formally established the "further NR coverage enhancements" work item (WI) in the Rel-18 version of NR. Among them, enhancing the coverage performance of PRACH transmission is one of the important topics of this work item.

[0053] To improve the coverage performance of PRACH transmission, in the 18th version (release 18, Rel-18) of NR, it is planned to introduce a PRACH transmission with multiple preamble repetitions, which can also be called multiple PRACH transmission. In this technical feature, the UE can send multiple preamble repetitions of the PRACH format on multiple resources respectively using the same transmit spatial filter (Tx spatial filter). In other words, the UE can send multiple preamble repetitions of the PRACH format through the same transmit beam.

[0054] Furthermore, for the PRACH transmission with multiple preamble repetitions, a set of PRACH occasions (ROSet, RO set) is associated with the same synchronization signal / physical broadcast channel block index (SS / PBCH block index, SSB index). This RO set usually includes multiple valid PRACH occasions (PRACH occasions, RACH occasions, ROs). Optionally, the multiple valid ROs in the RO set are continuous in time and use the same frequency resource in the frequency domain. Optionally, the number of valid ROs in the RO set is configured by a higher layer. Optionally, the number of valid ROs in the RO set can be 2, 4, or 8.

[0055] It should be noted that in the embodiments of this application, SSB can represent the synchronization signal / physical broadcast channel block (synchronization signal / physical broadcast channel block, SS / PBCH block), or it can also represent the synchronization signal block (synchronization signal block), which is not limited here.

[0056] Furthermore, the RO set is configured or determined within a time period X. That is to say, the configured or determined RO set is repeated in units of the time period X. Optionally, the time period X can include K SSB-to-RO association pattern periods.

[0057] As a possible implementation, if one or more preamble repetitions in a PRACH transmission with multiple preamble repetitions are dropped due to resource conflicts, the dropped preamble repetitions are no longer postponed for transmission.

[0058] It should be noted that RO in the above text refers to the time-frequency resources that can be used for PRACH preamble transmission. Additionally, in the NR system, there is a specific mapping relationship between SSB and RO, namely SSB-to-RO mapping. This mapping relationship is usually determined by two parameters. Exemplarily, one parameter is msg1-FDM. The other parameter is ssb-perRACH-Occasion or ssb-perRACH-OccasionAndCB-PreamblesPerSSB or msgA-SSB-PerRACH-OccasionAndCB-PreamblesPerSSB.

[0059] The parameter msg1-FDM can indicate the number of RO(s) frequency-division multiplexed (FDMed) within the same time instance. ssb-perRACH-Occasion can indicate the number of SSBs mapped to one RO, or the number of SSBs corresponding to each RO. ssb-perRACH-OccasionAndCB-PreamblesPerSSB or msgA-SSB-PerRACH-OccasionAndCB-PreamblesPerSSB can indicate the number of SSBs corresponding to each RO, and the number of preamble indices mapped to one SSB on each RO.

[0060] PRACH mask index

[0061] In some communication systems (e.g., NR), the physical random access procedure of a UE can be triggered by a physical downlink control channel (PDCCH) order or by higher layers. To reduce or avoid the probability of random access preamble conflicts, the gNB / eNB can specify the resources for the UE to perform PRACH transmission by configuring the PRACH mask index.

[0062] Exemplarily, the PRACH mask index can specify on which RO(s) within a system frame the UE performs PRACH transmission. In 3GPP TS38.321, these RO(s) can be associated with the specified or selected SSB index, as shown in Table 1. As described above, the PRACH occasion in Table 1 is the RO, and the PRACH occasion index is also the RO index.

[0063] Table 1

[0064]

[0065]

[0066] In some embodiments, when the PRACH transmission is triggered by a PDCCH order, the downlink control information (DCI) format in the PDCCH is used to indicate the PRACH mask index. Exemplarily, DCI format 1_0 is used to indicate the PRACH mask index and the associated SSB index, as shown in Table 2. In Table 2, the cyclic redundancy check (CRC) in DCI format 1_0 is scrambled by the cell radio network temporary identifier (C-RNTI). Additionally, DCI format 1_0 also indicates the DCI format identifier, frequency domain resource assignment, random access preamble index, uplink (UL) or supplementary uplink indicator, and reserved bits.

[0067] Table 2

[0068]

[0069] In some embodiments, when the PRACH transmission is triggered by a higher layer, the PRACH mask index can be indicated by a radio resource control information element (RRC IE). Exemplarily, the RRC IE ra-ssb-OccasionMaskIndex is used to indicate the PRACH mask index.

[0070] In the NR system, ROs are continuously mapped to each SSB index. Further, within each SSB-to-RO mapping cycle, the RO sorting indicated by the PRACH mask index is reset. For a PRACH transmission, the UE can select the RO indicated by the value of the PRACH mask index in Table 2 for the specified SSB index in the first available mapping cycle. For example, under the CFRA mechanism, the starting RO in the RO set occupied by multiple preamble repetitions is determined according to the PRACH mask index, thereby determining the RO set.

[0071] Optionally, the PRACH mask index can indicate RO(s) for the same SSB.

[0072] Optionally, the PRACH mask index is used to indicate the starting RO in the RO set corresponding to the SSB index.

[0073] As described above, NR Rel-18 introduced a PRACH transmission with multiple preamble repetitions or a complex PRACH transmission on one RO set. In this technology, the UE needs to select an RO set. The RO set contains multiple time division multiplexed (TDMed) available ROs.

[0074] When the UE selects an RO set for the SSB index according to the PRACH mask index, it can be selected in the following two selection methods.

[0075] In Option 1, all RO sets within the time period X are first determined. One or more determined RO sets are selected for transmitting preamble repetitions. Then, the PRACH mask index is used to indicate the starting RO of the RO set. According to the RO set where the starting RO is located, the RO set for transmitting preamble repetitions can be determined. It can be seen that Option 1 adopts the selection method of grouping first and masking second.

[0076] The following combines Figure 2 the mapping relationship between the SSB and RO shown, and makes an exemplary description of the method of Option 1. In Figure 2 the example, it is assumed that there are 2 SSB beams, and the SSB indexes corresponding to the 2 SSB beams are SSB0 and SSB1.

[0077] See Figure 2, within time period X, it includes three PRACH time slots (slots). The number of time-division multiplexed ROs in each PRACH time slot takes the value of 3. In the frequency domain, the number of frequency-division multiplexed ROs takes the value of 4. Therefore, there are 12 ROs corresponding to SSB0 or SSB1 respectively in each PRACH time slot. Figure 2 Shows the SSB index associated with each RO (RO associated with SSBx).

[0078] From Figure 2 it can be seen that the RO set size is 4. Since the 4 ROs within the RO set are time-division multiplexed, multiple RO sets within time period X are as shown by the dashed boxes in Figure 2 . Among them, each dashed box represents an RO set. Thus, within time period X, all RO sets have been determined.

[0079] Continue to refer to Figure 2 , the value of the PRACH mask index is 1. According to the indication of the PRACH mask index, the starting RO in the RO set is RO#1. Therefore, the RO set indicated by the PRACH mask index contains 4 shaded ROs, namely RO#1, RO#5, RO#9, and RO#13.

[0080] From Table 1 above, it can be seen that the indication field of the PRACH mask index is restricted. Therefore, the PRACH mask index may not be able to indicate some RO sets alone. For example, the indication field of the PRACH mask index cannot indicate the RO sets starting with any RO from RO#17 to RO#20 in Figure 2 . Further, the larger the RO set size, the larger the index of the starting RO of the RO set, so the RO sets that the PRACH mask index can indicate are more limited.

[0081] In option 2, the PRACH mask index indicates RO(s) for the same SSB. The RO(s) indicated by the PRACH mask index can be selected as the starting RO of the RO set, and the subsequent RO(s) of this starting RO form the RO set. Thus, it can be seen that option 2 adopts the selection method of masking first and then grouping (mask first, grouping second).

[0082] Next, in combination with the mapping relationship between SSB and RO shown in Figure 3 , an exemplary description of the method of option 2 is given. Compared with Figure 2 , the SSB indexes in Figure 3 are still SSB0 and SSB1, and the number of ROs in each PRACH time slot is also the same.

[0083] As can be seen from Figure 3 , the value of the PRACH mask index is 5. According to the indication of this PRACH mask index, the starting RO in the RO set is RO#5. Since the size of the RO set is 4, the RO set determined according to the PRACH mask index is as shown by the dashed box in Figure 3 . That is, the RO set indicated by the PRACH mask index contains 4 ROs filled with shading, namely RO#5, RO#9, RO#13, and RO#17.

[0084] As shown in Figure 3 , in Selection 2, the formation of the RO set has a higher degree of freedom. Although the indication field of the PRACH mask index is restricted, compared with Selection 1, the PRACH mask index can indicate a larger number of RO sets. However, in the system, there is not only the PRACH transmission indicated by the PRACH mask index, but also the RO set indicated by the non-PRACH mask index selected by the UE. Thus, it can be seen that when the formation of the RO set indicated by the PRACH mask index is too flexible, it may cause conflicts with the PRACH transmission on the RO set indicated by the non-PRACH mask index selected by the UE, thereby affecting the system performance.

[0085] Exemplarily, the indication by the non-PRACH mask index selected by the UE may be the indication method in the CBRA mechanism.

[0086] Time offset of the RO set

[0087] The PRACH transmission with multiple preamble repetitions needs to occupy multiple ROs in the RO set in one transmission. It is easy to cause preamble conflicts when the total number of ROs is limited.

[0088] To reduce the probability of preamble conflicts, it is necessary to control the density of the RO set. Therefore, NR Rel-18 introduces a time offset between RO sets. Optionally, the time offset can be determined by the first RO in two adjacent RO sets. For example, for each frequency-domain resource index in the frequency-division multiplexed ROs, there is a time offset between the first RO in the subsequent RO set and the first RO in the previous RO set, as shown in Figure 4 .

[0089] The time offset of the RO set includes multiple consecutive valid ROs. The time offset amount (i.e., the number of multiple consecutive valid ROs) can be provided by an RRC layer signaling (e.g., TimeOffsetBetweenStartingRO). In the RAN1#115 meeting, it has been agreed on the corresponding values of the time offset for the PRACH transmission with different numbers of preamble repetitions. See Figure 4, for PRACH transmissions with 2 leading repetitions, the time offset can be one of 4, 8, or 16; for PRACH transmissions with 4 leading repetitions, the time offset can be 8 or 16; for PRACH transmissions with 8 leading repetitions, the time offset can only be 16.

[0090] When the time offset between RO sets is configured, due to the limitation of the PRACH mask index indication field, even if the method of Option 1 (i.e., first forming multiple RO sets and then indicating with the PRACH mask index) is adopted, the available RO sets that the PRACH mask index can indicate are more limited because the index value of the starting RO of the RO sets at the time offset is relatively large.

[0091] In summary, after introducing PRACH transmissions with multiple leading repetitions and time offset, when adopting Option 1, the indicated RO sets may be limited due to the limitation of the PRACH mask index indication field, and when adopting Option 2, the RO sets indicated by the PRACH mask index may conflict with the PRACH transmissions of other mechanisms.

[0092] Therefore, in the PRACH transmission indicated by the PRACH mask index, how to indicate the RO sets for PRACH transmissions with multiple leading repetitions is a technical problem that needs to be studied. In particular, under the CFRA mechanism, how to effectively indicate the RO sets for a PRACH transmission with multiple leading repetitions is an urgent technical problem to be solved.

[0093] Furthermore, how to effectively indicate the time-frequency resources or RO sets of PRACH transmissions with multiple leading repetitions through the PRACH mask index and how to handle the problem of the limited PRACH mask index indication field are all technical problems that need to be solved.

[0094] Furthermore, in the case where there is a time offset between RO sets, how to indicate more valid RO sets with a limited PRACH mask index indication field is also a technical problem that needs to be considered.

[0095] To solve the above problems, an embodiment of the present application provides a method and apparatus for a node in wireless communication. In this method, a first node (e.g., UE) sends a first PRACH transmission with Nr leading repetitions on a first RO set. The first node can determine the initial RO in the first RO set according to whether the first time offset is configured, which helps to solve the problem of the limited PRACH mask index indication field. Furthermore, Nr is a positive integer greater than 1, and the first PRACH transmission sent by the first node can improve the performance gain of the PRACH transmission, increase the coverage range, reduce the random access delay, and improve the utilization efficiency of the random access resources.

[0096] Embodiments of the present application can be applied to a retransmission scenario where a physical random access channel (PRACH) transmission with multiple preamble repetitions is attempted during an initial random access channel (RACH) opportunity. In multiple RACH attempts for retransmission, this scenario can achieve coverage enhancement of the PRACH by using repeated transmissions of multiple preambles.

[0097] In some embodiments, the PRACH transmission with multiple preamble repetitions mentioned in the embodiments of the present application may refer to a complex PRACH transmission using the same beam, so as to obtain a signal-to-noise ratio gain by repeating multiple PRACHs on the same beam. In some embodiments, the PRACH transmission with multiple preamble repetitions mentioned in the embodiments of the present application may refer to a multi-PRACH transmission using different beams, so as to obtain a diversity gain by repeating multiple PRACHs on different beams.

[0098] It should be noted that the beam mentioned in the embodiments of the present application may include or be replaced by at least one of the following: physical beam, logical beam, spatial filter, spatial parameter, spatial domain filter, spatial domain transmission filter, spatial domain reception filter, antenna port.

[0099] Embodiments of the present application can be applied to an initial access process or a beam failure recovery process. Taking the initial access process as an example, embodiments of the present application can be applied to a four-step random access procedure (i.e., random access procedure type-1), or can also be applied to a two-step random access procedure (i.e., random access procedure type-2), and the embodiments of the present application are not limited thereto.

[0100] The method embodiments of the present application will be introduced in detail below with reference to the accompanying drawings. Figure 5 It is a schematic flow chart of a method in a first node for wireless communication provided by an embodiment of the present application. As Figure 5 shown, this method can be used for the interaction between the first node and the second node.

[0101] As an embodiment, the first node may be a network-controlled repeater (NCR).

[0102] As an example, the first node may be a user equipment, for example, Figure 1 the user equipment 120 shown.

[0103] As an example, the first node may be a relay, such as a relay terminal.

[0104] As an example, the second node may be a network device, for example, Figure 1 the network device 110 shown.

[0105] Figure 5 The method shown includes step S510, which will be introduced below.

[0106] In step S510, the first node sends a first PRACH transmission to the second node. As can be seen from the foregoing, the first PRACH transmission is a first physical random access channel transmission.

[0107] The first node may send the first PRACH transmission in a random access procedure (also referred to as a random access process), or may send the first PRACH transmission in beam management, which is not limited herein.

[0108] Exemplarily, the random access procedure may be one or more RACH attempts made by the first node based on the first PRACH transmission.

[0109] The first PRACH transmission includes Nr preamble repetitions. Wherein, Nr is a positive integer greater than 1. It can be seen that the first PRACH transmission is a PRACH transmission with multiple preamble repetitions, and can also be referred to as a complex PRACH transmission.

[0110] As an example, the first PRACH transmission is configured with Nr preamble repetitions.

[0111] As an example, the Nr is configured by a higher layer.

[0112] As an example, the Nr is determined by the first node itself. As an example, the first node may determine the Nr value according to the priority of the service. When the priority of the service is high, Nr may be 4 or 8.

[0113] As an example, the Nr is the number of preamble repetitions included in the first PRACH transmission.

[0114] As an example, Nr may be one of 2, 4, and 8.

[0115] As an embodiment, any two of the Nr preamble repetitions may be the same or different.

[0116] In some embodiments, any one of the Nr preamble repetitions in the first PRACH transmission may be replaced with one of a preamble, a PRACH preamble, a random access preamble, or a preamble format.

[0117] In some embodiments, the first node may perform the first PRACH transmission by sending Nr preamble repetitions. The first node sending the first PRACH transmission may be replaced with the first node sending Nr preamble repetitions, or performing the sending of Nr preamble repetitions.

[0118] As an embodiment, one or more of the Nr preamble repetitions may be discarded.

[0119] In some embodiments, the Nr preamble repetitions correspond to at least one preamble format. Exemplarily, the Nr preamble repetitions included in the first PRACH transmission respectively correspond to multiple different preamble formats. Exemplarily, at least two of the Nr preamble repetitions included in the first PRACH transmission correspond to different preamble formats. As an example, preamble repetition 1 among the multiple preamble repetitions adopts a preamble format including multiple sequences, while preamble repetition 2 adopts a preamble format including one sequence.

[0120] As an embodiment, the Nr preamble repetitions correspond to one preamble format.

[0121] As an embodiment, any one of the Nr preamble repetitions includes one preamble format.

[0122] As an embodiment, any one of the Nr preamble repetitions is one preamble format.

[0123] As an embodiment, any two of the Nr preamble repetitions adopt the same preamble format.

[0124] It should be noted that the preamble format corresponding to any one of the Nr preamble repetitions may be any existing preamble format or any future preamble format, which is not limited herein.

[0125] For ease of understanding, several preamble formats in Figure 6 are used below to exemplarily illustrate the possible preamble formats corresponding to the Nr preamble repetitions. Figure 6 Only some preamble formats are shown for comparative illustration. It should be understood that Figure 6The leading formats in it are only examples and do not limit the multiple leading formats corresponding to Nr leading repetitions.

[0126] Figure 6 The leading formats shown include Format 0 to Format 3, as well as Format C0 and Format C1. It can be seen from Figure 6 that there are also multiple other leading formats between Format 3 and Format C0. Refer to Figure 6 , the leading format mainly includes a cyclic prefix (CP) at the front, a sequence (SEQ) in the middle, and a guard period (GP) at the end. All leading formats will include a CP and n SEQs, and some leading formats may not include a GP.

[0127] It can be seen from Figure 6 that the number n of SEQs can be 1, such as Figure 6 Format 0 and Format C0 in. The number n of SEQs can also be other integers greater than 1. For example, Figure 6 the n value of Format 1 in is 2, and the n values of Format 2, Format 3, and Format C1 are 4.

[0128] Continue to refer to Figure 6 , the time lengths of different leading formats are different. For example, Format 0 and Format 3 are 1 ms, Format 1 is 3 ms, Format 2 is greater than 4 ms, and Format C0 and Format C1 are less than 1 ms. Since the total time lengths of different leading formats are different and the n values are different, the time lengths of CP, SEQ, and GP in different formats are also different.

[0129] The first node sends a first PRACH transmission on the first RO set. For the second node, the second node receives the first PRACH transmission on the first RO set. It can be seen from the foregoing that RO represents a RACH occasion or a PRACH occasion, and the first RO set is a first PRACH occasion set.

[0130] In the embodiments of the present application, the RO set may include or be replaced by at least one of the following: ROSet, a random access channel occasion group (ROG), a PRACH occasion group, and a PRACH transmission occasion set.

[0131] As an embodiment, the first RO set can be replaced by the first ROSet.

[0132] As an example, the first RO set may be replaced by a first set of PRACH occasions.

[0133] As an example, the first RO set may be replaced by a first set of PRACH transmission occasions.

[0134] The first RO set may include Nr ROs. Nr has been described above and will not be elaborated here. As an example, the Nr is the number of ROs in the first RO set.

[0135] In the embodiments of the present application, an RO may include or be replaced by at least one of the following: RACH occasion, PRACH occasion, physical random access channel transmission occasion.

[0136] As an example, the Nr ROs may be replaced by Nr PRACH occasions.

[0137] As an example, the Nr ROs may be replaced by Nr PRACH transmission occasions.

[0138] As an example, the Nr ROs included in the first RO set are continuous in the time domain.

[0139] As an example, the Nr ROs included in the first RO set use the same frequency domain resources.

[0140] As an example, the Nr ROs included in the first RO set are all valid. An RO is valid means that the time-frequency resources corresponding to the RO can be used for PRACH transmission.

[0141] The time domain resources corresponding to the first RO set are used to send the first PRACH transmission. In some embodiments, the first node may send Nr preamble repetitions in the first preamble repetition through the Nr ROs in the first RO set. In other words, the Nr preamble repetitions may be carried on the Nr ROs respectively.

[0142] The first RO set may be one of multiple RO sets. Each RO set in the multiple RO sets includes Nr ROs. That is to say, each RO set includes the same number of ROs to facilitate determining the first RO set for sending the first PRACH transmission.

[0143] The multiple RO sets correspond to the same frequency domain resource index. In some embodiments, the frequency domain resource index may be set according to different frequency units or different frequency bandwidths, which is not limited here.

[0144] As an embodiment, the fact that the multiple RO sets correspond to the same frequency-domain resource index means that the frequency-domain resources occupied by all the RO sets in the multiple RO sets correspond to the same frequency-domain resource index.

[0145] As an embodiment, the fact that the multiple RO sets correspond to the same frequency-domain resource index means that the multiple RO sets can be some or all of the RO sets corresponding to the same frequency-domain resource index within the first period.

[0146] As an embodiment, the fact that the multiple RO sets correspond to the same frequency-domain resource index includes that the indexes of the frequency-domain resources occupied by any two RO sets in the multiple RO sets are the same.

[0147] As an embodiment, the fact that the multiple RO sets correspond to the same frequency-domain resource index includes that the indexes of the frequency-domain resources occupied by the Nr ROs included in any one RO set in the multiple RO sets are the same.

[0148] As an embodiment, the frequency-domain resource occupied by any one RO in any one RO set in the multiple RO sets can be some or all of the frequency-domain resources indicated by the same frequency-domain resource index.

[0149] The first time offset is the time offset between any two adjacent RO sets in the multiple RO sets. That is to say, the time offset between any two adjacent RO sets in the multiple RO sets is the same, namely the first time offset.

[0150] As an embodiment, in the multiple RO sets, the first time offset can indicate the time offset between the first RO set and the previous or next RO set.

[0151] As an embodiment, the first time offset is used to indicate the time offset between the RO at the first position in the first RO set and the RO at the first position in the second RO set among any two adjacent first RO sets in the multiple RO sets. For example, the first time offset is the time offset between the starting RO in the first RO set and the starting RO in the second RO set. Another example is that the first time offset is the first time offset between the third RO in the first RO set and the third RO in the second RO set.

[0152] The first time offset includes a positive integer number of ROs. The offset amount of the first time offset can be represented by the positive integer number of ROs.

[0153] As an example, the duration of the first time offset is greater than or equal to the duration of a positive integer number of ROs. As described above, the value of the first time offset is related to the number of preamble repetitions (Nr). Since the number of preamble repetitions is related to the number of ROs in each RO set, the value of the first time offset can be represented by the number of ROs.

[0154] As an example, the positive integer number of ROs included in the first time offset are continuous in time.

[0155] As an example, the positive integer number of ROs included in the first time offset are all valid.

[0156] As an example, the positive integer number of ROs included in the first time offset are valid ROs that are continuous in time.

[0157] As an example, the positive integer number of ROs included in the first time offset correspond to the same frequency domain resource index.

[0158] As an example, the frequency domain resource index corresponding to the positive integer number of ROs included in the first time offset is the same as the frequency domain resource index corresponding to the multiple RO sets.

[0159] As an example, within a certain frequency bandwidth, the time offsets of multiple RO sets corresponding to different frequency domain resource indexes can be the same or different, which is not limited here.

[0160] As an example, the time offset of multiple RO sets corresponding to the first frequency domain resource index is the first time offset, and the time offset of multiple RO sets corresponding to the second frequency domain resource index is the second time offset, and the first time offset is the same as the second time offset.

[0161] As an example, the first time offset is configured by a higher layer.

[0162] As an example, the first time offset is indicated by an RRC IE.

[0163] As an example, the first time offset includes TimeOffsetBetweenStartingRO.

[0164] As an example, the definition of TimeOffsetBetweenStartingRO refers to 3GPP TS38.331.

[0165] In some embodiments, after the time domain position of the starting RO set in the multiple RO sets is determined, the time domain position of any RO set other than the starting RO set in the multiple RO sets can be determined according to a first time offset. Exemplarily, any RO set in the multiple RO sets can be referred to as an alternative RO set. The multiple alternative RO sets include a first RO set.

[0166] As an embodiment, the first alternative RO set and the second alternative RO set are any two adjacent RO sets in the multiple RO sets, the first time offset includes M ROs, and M is a positive integer; the starting RO of the second alternative RO set is M ROs after the starting RO of the first alternative RO set.

[0167] As a sub - embodiment of the above - mentioned embodiment, the M ROs are consecutive valid ROs in time.

[0168] As an embodiment, the value of M is greater than the value of Nr, and the value of M is a positive integer multiple of the value of Nr.

[0169] As an embodiment, the value of M is any positive integer greater than the value of Nr.

[0170] As an embodiment, when the value of M is equal to or less than the value of Nr, it can indicate that the first time offset is not configured.

[0171] For ease of understanding, assume that Nr is 2, and in combination with Figure 7 an exemplary illustration of the first time offset is given. Figure 7 Twelve consecutive ROs in the time domain are shown, namely RO#1 to RO#12. It can be Figure 7 seen that when the number of ROs in each alternative RO set is the same (both are 2), the first time offset can be represented by the number of ROs M.

[0172] Refer to Figure 7 , the first time offset is determined by the time offset between the starting ROs in two adjacent alternative RO sets. When M = 4, the first time offset 710 includes 4 ROs. When M = 8, the first time offset 720 includes 8 ROs.

[0173] As Figure 7 shown, after the first time offset is configured, the index of the starting RO of the alternative RO set other than the first alternative RO set becomes relatively larger. When M = 4, the index of the starting RO of the second alternative RO set is 5, the index of the starting RO of the third alternative RO set is 9, and so on. When M = 8, the index of the starting RO of the second alternative RO set is 9, and the index of the starting RO of the third alternative RO set should be 17 ( Figure 7is not shown in the figure), and so on.

[0174] Whether the first time offset is configured is used to determine the starting RO in the first RO set, which can solve the problem of limited PRACH mask index indication field caused by the configured time offset between RO sets, and can more flexibly indicate the first RO set. For Figure 7 example, after configuring the first time offset, the index of the starting RO in the RO set will be relatively large. If only indicated according to the PRACH mask index, the number of available RO sets that can be indicated is small. In order to increase the range of RO sets that can be indicated, the first time offset needs to be considered when indicating the RO set. However, for a certain PRACH transmission, the higher layer may not necessarily configure or the RRC may not necessarily indicate the first time offset. If the first time offset is not configured or indicated, the index of the starting RO in the first RO set may be relatively small, and the first time offset does not need to be considered when indicating the RO set.

[0175] In some embodiments, the first RO set can be determined by determining the starting RO in the first RO set. Therefore, determining the starting RO in the first RO set can be replaced by determining the first RO set.

[0176] As an embodiment, the starting RO in the first RO set can be used to determine the first RO set for transmitting the first PRACH transmission. Exemplarily, when Nr ROs in the first RO set are continuous in the time domain and use the same frequency domain resource, one or more ROs after the starting RO in the first RO set can be determined according to the starting RO, thereby determining the first RO set.

[0177] Optionally, the starting RO in the first RO set is the first RO among the Nr ROs included in the first RO set.

[0178] Optionally, the starting RO in the first RO set is the RO earliest in the time domain among the Nr ROs included in the first RO set.

[0179] As an embodiment, when the first time offset is configured, the first time offset is used to determine the starting RO in the first RO set.

[0180] As an embodiment, when the first time offset is configured, the first time offset and other parameters are jointly used to determine the starting RO in the first RO set. Among them, the other parameters may include at least one of Nr and the first PRACH mask index, the number of multiple SSB indexes, the first SSB index, and the first mapping order described later. This will be described in detail in combination with embodiments later.

[0181] As an embodiment, when the first time offset is configured, the number of ROs included in the first time offset is used to determine the starting RO in the first RO set.

[0182] As an embodiment, when the first time offset is not configured, the first time offset is not used to determine the starting RO in the first RO set.

[0183] The first node can trigger the first PRACH transmission based on various methods. That is to say, the first node can perform the transmission of the first PRACH transmission based on various information. For example, the first node can trigger the first PRACH transmission according to the first signaling sent by the second node. Also, for example, the first node can trigger the first PRACH transmission according to the high-layer signaling.

[0184] In some embodiments, the first PRACH transmission is triggered by the first signaling. In other words, after receiving the first signaling, the first node performs the transmission of the first PRACH transmission. The first node can receive the first signaling in various ways.

[0185] In some embodiments, the first signaling may be sent by the second node to the first node. Exemplarily, the second node can send the first signaling to the first node through DCI. In some embodiments, the first node can determine the first signaling through higher-layer signaling. Exemplarily, the first node can receive the first signaling through radio resource control (RRC) signaling.

[0186] As an embodiment, the first signaling is DCI.

[0187] As an embodiment, the first signaling is a PDCCH order.

[0188] As an embodiment, the first signaling is an RRC IE.

[0189] As an embodiment, the first signaling is ra-ssb-OccasionMaskIndex.

[0190] As an embodiment, the definition of ra-ssb-OccasionMaskIndex refers to 3GPP TS38.331.

[0191] As an embodiment, the first signaling includes at least one of DCI and RRC IE.

[0192] The first signaling may include a first PRACH mask index. As can be seen from the foregoing, PRACH represents the physical random access channel, and the first PRACH mask index is the first physical random access channel mask index.

[0193] The value corresponding to the first PRACH mask index can be any index value in Table 1 above, or any index value after the extension of Table 1, or any index value in the newly created PRACH mask index table, which is not limited herein.

[0194] As an embodiment, the value of the first PRACH mask index is one of 0 to 15.

[0195] As an embodiment, the value of the first PRACH mask index is one of 0 to 10.

[0196] In some embodiments, the first PRACH mask index is used to indicate the RO associated with the first SSB. This RO can be used as the starting RO in the first RO set for transmitting the first PRACH transmission.

[0197] As an embodiment, the first PRACH transmission is triggered by a first signaling, and the first signaling is a PDCCH order.

[0198] As an embodiment, the first signaling is a PDCCH order, and the value of the random access preamble index field included in the first signaling is not 0. The first node can send the first PRACH transmission according to the value of the random access preamble index field in the PDCCH command.

[0199] As an embodiment, the first PRACH transmission is triggered by a higher layer.

[0200] As an embodiment, the first PRACH transmission is triggered by a higher layer, and the first signaling is an RRC IE.

[0201] In some embodiments, the first node can send the first PRACH transmission after receiving the first SSB. Exemplarily, the first node can receive the first SSB sent by the second node. The first SSB can be one of the SSBs in the first SSB set sent by the second node. That is to say, the first SSB is one of the multiple SSBs included in the first SSB set.

[0202] As an embodiment, the number of SSBs in the first SSB set is indicated by a higher layer signaling.

[0203] As an embodiment, the number of SSBs in the first SSB set is indicated by an RRC IE.

[0204] As an embodiment, the number of SSBs in the first SSB set is indicated by ssb-PositionsInBurst in SIB1 or ServingCellConfigCommon.

[0205] As an example, the number of SSBs in the first SSB set is equal to the value of ssb-PositionsInBurst in SIB1 or ServingCellConfigCommon.

[0206] As an example, the definition of SIB1 refers to 3GPP TS38.331.

[0207] As an example, the definition of ServingCellConfigCommon refers to 3GPP TS38.331.

[0208] As an example, the first SSB is related to the first RO set and / or the first PRACH transmission.

[0209] As an example, the first SSB set includes the first SSB.

[0210] As an example, the first SSB is selected from the multiple SSBs.

[0211] As an example, the first PRACH transmission is triggered by a higher layer, and the first SSB is selected from the multiple SSBs.

[0212] As an example, the first PRACH transmission is triggered by a higher layer, the first signaling is an RRC IE, and the first SSB is selected from the multiple SSBs.

[0213] In some embodiments, the first node may determine the first SSB by measuring multiple SSBs in the first SSB set. Exemplarily, the measured value for the first SSB is the maximum value among multiple measured values for the multiple SSBs included in the first SSB set.

[0214] In some embodiments, the above-mentioned measured value may be indicated by any parameter indicating signal quality. Exemplarily, the measured value may be indicated by parameters such as reference signal received power (RSRP), reference signal received quality (RSRQ), etc.

[0215] As an example, the measured value for the first SSB includes an RSRP value.

[0216] As an example, the multiple measured values for the multiple SSBs included in the first SSB set are respectively multiple RSRP values.

[0217] As an embodiment, the multiple measurement values of the multiple SSBs included in the first SSB set include multiple maximum values, and the measurement value of the first SSB is one of the multiple maximum values.

[0218] As a sub - embodiment of the above - mentioned embodiment, the measurement value of the first SSB is any one of the multiple maximum values.

[0219] As a sub - embodiment of the above - mentioned embodiment, the measurement value of the first SSB is the first maximum value among the multiple maximum values.

[0220] In some embodiments, the index of the first SSB can be used by the first node to determine the corresponding RO or RO set. The SSB index can indicate the SSB. The index of the first SSB is the first SSB index. The multiple SSBs in the first SSB set correspond to multiple SSB indexes. For example, when the first SSB set includes 4 SSBs, the 4 SSBs correspond to 4 SSB indexes, which are SSB0 to SSB3 respectively.

[0221] As an embodiment, the multiple SSBs in the first SSB set are in one - to - one correspondence with the multiple SSB indexes.

[0222] As an embodiment, the number of SSBs in the first SSB set is equal to the number of the multiple SSB indexes.

[0223] As an embodiment, the multiple SSB indexes are respectively the indexes of the multiple SSBs included in the first SSB set.

[0224] As an embodiment, any one of the multiple SSB indexes is the index of one SSB corresponding to the any one of the multiple SSB indexes among the multiple SSBs.

[0225] As an embodiment, the first SSB index is one of the multiple SSB indexes.

[0226] As an embodiment, the first SSB index is the index of the first SSB among the multiple SSBs included in the first SSB set.

[0227] As an embodiment, the Nr ROs in the first RO set are associated with the first SSB index.

[0228] The first SSB index can be carried in multiple types of information. For example, the index of the first SSB can be indicated by the first signaling.

[0229] As an embodiment, the first signaling includes the index of the first SSB.

[0230] As an example, the first PRACH transmission is triggered by a first signaling, and the first signaling includes the index of the first SSB.

[0231] As an example, the first PRACH transmission is triggered by the first signaling, the first signaling is a PDCCH order, and the first signaling includes the index of the first SSB.

[0232] As an example, the first PRACH transmission is triggered by the first signaling, the first signaling is a PDCCH order, the value of the random access preamble index field included in the first signaling is not 0, and the first signaling includes the index of the first SSB.

[0233] As described above in connection with Figures 5 to 7 a solution is introduced in which when the first node sends a first PRACH transmission on the first RO set, the first RO set is determined according to whether the first time offset is configured, so that the indication of the first RO set can be more flexible. Further, when the first time offset is configured, the first RO set can be determined according to the configured time offset. The following describes the specific implementation manner of determining the first RO set or its starting RO according to whether the first time offset is configured and the configured time offset.

[0234] In some embodiments, when the first time offset is configured, the starting RO in the first RO set is related to the first time offset and other parameters; when the first time offset is not configured, the starting RO in the first RO set is only related to other parameters. The other parameters include at least one of the number of multiple SSB indexes, the first SSB index, and Nr.

[0235] As an example, when the first time offset is configured, the starting RO in the first RO set is related to the number of ROs included in the first time offset, the number of multiple SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the starting RO in the first RO set is related to the number of multiple SSB indexes, the first SSB index, and Nr.

[0236] In some embodiments, whether the first time offset is configured is used to determine the index of the starting RO in the first RO set. Determining the starting RO in the first RO set includes determining the index of the starting RO in the first RO set. By determining the index of the starting RO, the starting RO in the first RO set can be determined.

[0237] In some embodiments, the first period includes multiple candidate ROs. Any RO in the multiple RO sets belongs to the multiple candidate ROs within the first period. Thus, the multiple candidate ROs include any RO in the multiple RO sets.

[0238] As an embodiment, the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the multiple candidate ROs.

[0239] As an embodiment, the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the multiple candidate ROs within the first period.

[0240] As an embodiment, the multiple candidate ROs correspond to multiple RO indices. The starting index among the multiple candidate RO indices is also related to the index of the starting RO in the first RO set.

[0241] As an embodiment, when the first time offset is configured, the index of the starting RO in the first RO set is related to the number of ROs included in the first time offset, the number of the multiple SSB indices, the first SSB index, and Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is related to the number of the multiple SSB indices, the first SSB index, and Nr.

[0242] As an embodiment, when the first time offset is configured, the index of the starting RO in the first RO set is determined according to the number of ROs included in the first time offset, the number of the multiple SSB indices, the first SSB index, and Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is determined according to the number of the multiple SSB indices, the first SSB index, and Nr.

[0243] In some embodiments, the first period can be used to determine multiple ROs associated with the SSBs in the first SSB set. The first period can be the time period X described above, or other time periods for indicating multiple ROs, which are not limited herein.

[0244] As an embodiment, the first period starts from wireless frame 0 (frame 0).

[0245] As an embodiment, the first period includes at least one association pattern period.

[0246] As an embodiment, the first period includes at least one SSB index to RO association pattern period.

[0247] As an embodiment, the association pattern period is the association pattern period of SSB index to RO.

[0248] As an embodiment, the association pattern period is the association pattern period of SSB to RO.

[0249] As an embodiment, the association pattern period includes at least one association period.

[0250] As an embodiment, the association pattern period includes at least one association period of SSB index to RO.

[0251] As an embodiment, the association period is the association period of SSB index to RO.

[0252] As an embodiment, the association period is the association period of SSB to RO.

[0253] As an embodiment, the first period includes at least one association period of SSB index to RO.

[0254] As an embodiment, the first period includes at least one association period.

[0255] As an embodiment, the association period includes at least one mapping cycle.

[0256] As an embodiment, the association period includes at least one mapping cycle of SSB index to RO.

[0257] As an embodiment, the first period includes at least one mapping cycle of SSB index to RO.

[0258] As an embodiment, the first period includes at least one mapping cycle.

[0259] In some embodiments, the first period includes a plurality of alternative RO sets. Whether the first time offset is configured is used to determine the index of the first RO set in the plurality of alternative RO sets.

[0260] In some embodiments, the first RO set is selected from a plurality of alternative RO sets. The plurality of alternative RO sets may be a plurality of pre-configured RO sets within the first period to avoid conflicts with PRACH transmissions under the CBRA mechanism.

[0261] As an example, within time period X, multiple alternative RO sets for PRACH transmissions with multiple preamble repetitions can be preconfigured before the PRACH mask index indication, that is, the first RO set is determined in the manner of Option 1 described above. Also, for example, to avoid conflicts between multi-preamble repetition PRACH transmissions under the CFRA mechanism and multi-preamble repetition PRACH transmissions under the CBRA mechanism, multiple RO sets within time period X for multi-preamble repetition PRACH transmissions need to be preconfigured before the PRACH mask index indication. That is to say, the RO set or the starting RO in the RO set is indicated in the manner of Option 1.

[0262] As an example, any one of the multiple RO sets is one of the multiple alternative RO sets.

[0263] As an example, the multiple alternative RO sets are multiple RO sets related to the first SSB and / or the first PRACH transmission.

[0264] As an example, the multiple alternative RO sets correspond to indexes of the multiple alternative RO sets. The index of the first RO set among the multiple alternative RO sets can represent the position of the first RO set among the multiple alternative RO sets.

[0265] In some embodiments, when the first time offset is configured, the index of the first RO set among the multiple alternative RO sets is related to the number of ROs included in the first time offset, the number of the multiple SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the first RO set among the multiple alternative RO sets is related to the number of the multiple SSB indexes, the first SSB index, and Nr.

[0266] As an example, when the first time offset is configured, the index of the first RO set among the multiple alternative RO sets is determined according to the number of ROs included in the first time offset, the number of the multiple SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the first RO set among the multiple alternative RO sets is determined according to the number of the multiple SSB indexes, the first SSB index, and Nr.

[0267] As can be seen from the foregoing, the first node can trigger the first PRACH transmission after receiving the first signaling. Among them, the first signaling includes the first PRACH mask index. The first PRACH mask index is also used to determine the first RO set or the starting RO in the first RO set.

[0268] In some embodiments, when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

[0269] As an embodiment, when the first time offset is configured, the starting RO in the first RO set is determined according to the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is determined according to the first PRACH mask index.

[0270] As an embodiment, when the first time offset is configured, the starting RO in the first RO set is related to the number of ROs included in the first time offset and other parameters; when the first time offset is not configured, the starting RO in the first RO set is related only to other parameters. The other parameters include at least one of the number of SSBs in the first SSB set, the index of the first SSB, Nr, and the first PRACH mask index.

[0271] As an embodiment, when the first time offset is configured, the index of the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the index of the starting RO in the first RO set is related to the first PRACH mask index.

[0272] As an embodiment, when the first time offset is configured, the index of the starting RO in the first RO set is determined according to the first time offset and the first PRACH mask index; when the first time offset is not configured, the index of the starting RO in the first RO set is determined according to the first PRACH mask index.

[0273] As an embodiment, when the first time offset is configured, the index of the starting RO in the first RO set is related to the number of ROs included in the first time offset and other parameters; when the first time offset is not configured, the index of the starting RO in the first RO set is related only to other parameters. The other parameters include at least one of the number of SSBs in the first SSB set, the index of the first SSB, Nr, and the first PRACH mask index.

[0274] As an example, when the first time offset is configured, the index of the first RO set among the multiple alternative RO sets is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the index of the first RO set among the multiple alternative RO sets is related to the first PRACH mask index.

[0275] As an example, when the first time offset is configured, the index of the first RO set among the multiple alternative RO sets is determined according to the first time offset and the first PRACH mask index; when the first time offset is not configured, the index of the first RO set among the multiple alternative RO sets is determined according to the first PRACH mask index.

[0276] As an example, when the first time offset is configured, the index of the first RO set among the multiple alternative RO sets is related to the number of ROs included in the first time offset and other parameters; when the first time offset is not configured, the index of the first RO set among the multiple alternative RO sets is related only to other parameters. The other parameters include at least one of the number of SSBs in the first SSB set, the index of the first SSB, Nr, and the first PRACH mask index.

[0277] The above describes an example embodiment of the method for determining the starting RO in the first RO set according to whether the first time offset is configured. Through this method, the problem of the limited indication field of the PRACH mask index caused by the first time offset can be solved. For ease of understanding, below, taking the starting RO of the first RO set being determined according to the first time offset and the first PRACH mask index as an example, in combination with Figures 8 - 9 An exemplary description is given of the method for determining the first RO set according to whether the first time offset is configured.

[0278] Figures 8 - 9 The mapping relationship in Figure 2 is the same, which will not be elaborated here. Figure 8 For an example where the first time offset is not configured, Figure 9 For an example where the number of ROs included in the first time offset is 4, Figure 10 For an example where the number of ROs included in the first time offset is 8. Among them, the number of SSBs (the number of multiple SSB indexes) is 2, the size of the RO set is 2, that is, Nr is 2.

[0279] See Figure 8, the first time offset is not configured, and multiple alternative RO sets corresponding to SSB0 have been pre-configured and filled with shading. When the first PRACH mask index is 3, the starting RO of the first RO set can be determined as RO#9 according to the number of multiple SSB indexes, the first SSB index, and the first PRACH mask index.

[0280] See Figure 9 , the offset of the first time offset is configured to 4, that is, the number of ROs included in the first time offset is 4. Figure 8 The RO set filled with shading in is the multiple alternative RO sets corresponding to SSB0 determined according to the number of ROs included in the first time offset. When the first PRACH mask index is 3, the starting RO of the first RO set can be determined as RO#17 according to the number of ROs included in the first time offset, the number of multiple SSB indexes, the first SSB index, and the first PRACH mask index.

[0281] See Figure 10 , the offset of the first time offset is configured to 8, that is, the number of ROs included in the first time offset is 8. Figure 8 The RO set filled with shading in is the multiple alternative RO sets corresponding to SSB0 determined according to the number of ROs included in the first time offset. When the first PRACH mask index is 3, the starting RO of the first RO set can be determined as RO#33 according to the number of ROs included in the first time offset, the number of multiple SSB indexes, the first SSB index, and the first PRACH mask index.

[0282] It can be seen from Figures 8 to 10 that when determining the starting RO in the first RO set according to whether the first time offset is configured and the configured offset, the index of the starting RO is much larger than the maximum RO index that can be indicated by the first PRACH mask index in Table 1. Therefore, the RO set that this method can indicate is not limited by the indication field of the first PRACH mask index.

[0283] As described above in combination with Figures 4 to 10 an embodiment of the method for the first RO set or the starting RO of the first RO set according to whether the first time offset is configured is introduced. This method helps to solve the problem of limited indication field of the PRACH mask index. Through this method, the advantage of avoiding conflicts with other PRACH transmissions in the selection 1 method can also be continued, and the PRACH mask index can also more flexibly indicate the RO set.

[0284] However, not all the preambles in an RO are necessarily associated with an SSB. That is to say, an RO may be associated with multiple SSBs. When there are 64 preambles in an RO, after the SSBs are mapped to the RO according to the SSB-to-RO mapping relationship, any two adjacent RO sets may not be derivable from each other using the above formula or other means. For example, the difference between the starting RO of the latter RO set and the starting RO of the former RO set is not necessarily an integer multiple of the number of SSBs and / or Nr.

[0285] To solve this problem, an embodiment of the present application further proposes a method for determining the starting RO of the first RO set. In this method, the first RO set may also be related to the first mapping order, so as to maximize the range of the RO sets that can be indicated.

[0286] In some embodiments, the first mapping order is a mapping relationship that can map multiple SSB indexes to multiple candidate ROs. The first mapping order is used for mapping multiple SSB indexes to multiple candidate ROs within the first period. The first mapping order may be an existing mapping relationship between SSB and RO, or an extended mapping relationship between SSB and RO, which is not limited herein.

[0287] As an embodiment, the first mapping order may be associated with one or more of the following information: the indexes of the preambles within the first RO set, the frequency-domain resources of multiple candidate RO sets, and the time-domain resources of multiple candidate RO sets.

[0288] As an embodiment, the first mapping order may include: according to the change order of the preamble indexes within one of the multiple candidate RO sets, such as the order of increasing preamble indexes or the order of decreasing preamble indexes, etc. In other words, multiple SSB indexes may be arranged according to the change order of the preamble indexes within one of the multiple candidate RO sets.

[0289] As an embodiment, the first mapping order may include: according to the change order of the frequency-domain resources of multiple candidate RO sets, such as the order of increasing frequency-domain resources or the order of decreasing frequency-domain resources, etc. In other words, multiple SSB indexes may be arranged according to the change order of the frequency-domain resources for the multiple candidate RO sets multiplexed in the frequency domain.

[0290] As an embodiment, the first mapping order may include: according to the change order of the time-domain resources of multiple candidate RO sets, such as the order of increasing time-domain resources or the order of decreasing time-domain resources, etc. In other words, multiple SSB indexes may be arranged according to the change order of the time-domain resources for the multiple candidate RO sets multiplexed in the time domain.

[0291] As an example, the first mapping order may include one or more of the following orders: in the order of increasing leading indices within one RO set among a plurality of alternative RO sets; in the order of increasing frequency-domain resources of a plurality of alternative RO sets; and in the order of increasing time-domain resources of a plurality of alternative RO sets.

[0292] As an example, the first mapping order may include: first, in the order of increasing leading indices within one alternative RO set among a plurality of alternative RO sets; then, in the order of increasing frequency-domain resources of a plurality of alternative RO sets; and then, in the order of increasing time-domain resources of a plurality of alternative RO sets. It should be understood that the first mapping order may also include random permutations and combinations of the above several orders, which are not limited herein.

[0293] As an example, the starting RO of the first RO set may be related to whether the first time offset is configured and the configured offset, the first mapping order, the number of a plurality of SSB indices, the first SSB index, Nr, and the first PRACH mask index.

[0294] As an example, the first RO set may be related to whether the first time offset is configured and other parameters. The other parameters include some or all of the first mapping order, the number of SSBs, the first SSB index, Nr, and the first PRACH mask index.

[0295] As an example, regardless of whether the first time offset is configured, the starting RO in the first RO set is related to the mapping of the number of the plurality of SSB indices to the plurality of ROs.

[0296] As an example, regardless of whether the first time offset is configured, the starting RO in the first RO set is related to the mapping of the number of the plurality of SSB indices to the plurality of alternative ROs, Nr, and the first PRACH mask index.

[0297] In some examples, the first node may first map a plurality of SSB indices to a plurality of alternative ROs according to the first mapping order. The plurality of alternative ROs include Nr ROs in the first RO set. Exemplarily, the plurality of alternative ROs may be some or all of the ROs within the first period.

[0298] As an example, at least two of the plurality of alternative ROs are frequency-division multiplexed (FDM). For example, Figure 8 RO#1 and RO#2 in are frequency-division multiplexed.

[0299] As an example, at least two of the plurality of alternative ROs are FDM-ed.

[0300] As an example, at least two of the plurality of alternative ROs are frequency multiplexed PRACH occasions.

[0301] As an example, the plurality of alternative ROs are all time division multiplexed (TDM).

[0302] As an example, the plurality of alternative ROs being time division multiplexed can also be expressed as the plurality of alternative ROs being TDM-ed.

[0303] As an example, the plurality of alternative ROs are time multiplexed PRACH occasions.

[0304] As an example, at least two of the plurality of alternative ROs are TDM.

[0305] As an example, at least Nr of the plurality of alternative ROs are TDM.

[0306] As an example, the plurality of alternative ROs are within at least one PRACH time slot.

[0307] As an example, the plurality of alternative ROs are within one PRACH time slot.

[0308] As an example, the plurality of alternative ROs are within multiple PRACH time slots.

[0309] The above introduced various ways to indicate the first set of ROs according to whether the first time offset is configured and multiple other parameters. Among the multiple other parameters, the first PRACH mask index can be indicated by the first signaling. The relevant parameters of the SSB are determined by receiving and detecting the first set of SSBs. The first node also needs to determine Nr and the first mapping order. The method for the first node to determine these parameters will be described below.

[0310] In some embodiments, the first node can determine the parameters indicating the first set of ROs by receiving the first information. Exemplarily, the first node can receive the first information sent by the second node.

[0311] As an example, the first information can include partial parameters for indicating the first set of ROs.

[0312] As an example, the first information can be used to determine partial parameters indicating the first set of ROs.

[0313] As an example, the mapping relationship between the SSB and the RO includes the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO. That is to say, the first information can be used to determine the first mapping order.

[0314] As an example, the first information and the first mapping order are used to determine that the multiple SSB indexes are mapped to the multiple alternative ROs within the first period.

[0315] As an example, the first information, the first mapping order, and the number of the multiple SSB indexes are used to determine the mapping of the multiple SSB indexes to the multiple ROs.

[0316] As an example, the first information, the first mapping order, and the number of the multiple SSB indexes are used to determine the association of the multiple SSB indexes with the multiple ROs.

[0317] In some embodiments, the first information can be used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO. In other words, the first information is used to determine the number of SSBs corresponding to each RO and the number of contention-based preambles corresponding to each SSB.

[0318] As an example, the first information indicates that N SSB indexes are associated with one RO, where N is less than 1, or N is not less than 1.

[0319] As an example, the first information indicates that R preambles are associated with each SSB index of each RO, and R is a positive integer. Exemplarily, when multiple SSB indexes are associated with one RO, each of the SSB indexes is associated with R preambles on the RO.

[0320] As an example, R is a positive integer not greater than 64. Generally, there are 64 preambles on one RO. Therefore, R is not greater than 64.

[0321] As an example, the first information indicates that one SSB index is associated with R preambles on one RO.

[0322] As an example, the first information indicates that one SSB index is mapped to R preambles on one RO.

[0323] As an example, the first information indicates that N SSB indexes are associated with one RO, and the first information indicates that R preambles are associated with each SSB index of each RO.

[0324] As an example, the R preambles are respectively R contention based preambles.

[0325] Optionally, the indexes of the R preambles are consecutive. Optionally, the R preambles have consecutive indexes.

[0326] In some embodiments, the first information includes ssb-perRACH-Occasion or ssb-perRACH-OccasionAndCB-PreamblesPerSSB or msgA-SSB-PerRACH-OccasionAndCB-PreamblesPerSSB in 3GPP TS38.331.

[0327] As an example, the first information includes an RRC IE.

[0328] As an example, the first information is ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

[0329] As an example, the definition of ssb-perRACH-OccasionAndCB-PreamblesPerSSB refers to 3GPP TS38.331.

[0330] In some embodiments, the first information is further used to indicate relevant parameters of frequency division multiplexing, such as the number of ROs for frequency division multiplexing. The relevant parameters of frequency division multiplexing can also be used as one of the other parameters, which will not be elaborated here.

[0331] As an example, the first information indicates the number of ROs for frequency division multiplexing in a time period.

[0332] As an example, the first information indicates the number of ROs for frequency division multiplexing among the multiple ROs.

[0333] As an example, the first information includes msg1-FDM.

[0334] As an example, the definition of msg1-FDM refers to 3GPP TS38.331.

[0335] In some embodiments, the first node can determine Nr by receiving the second information. Exemplarily, the first node receives the first information sent by the second node. The first information may include Nr.

[0336] As an example, the second information is configured by a higher layer. As an example, the second information includes an RRC IE.

[0337] In some embodiments, the first node may determine multiple candidate RO sets based on the first mapping order, the number of multiple SSB indexes, the first SSB index and Nr. Then, the first node may determine the first RO set or the starting RO in the first RO set based on whether the first time offset is configured, the configured offset and the first PRACH mask index.

[0338] The following is a specific example Figure 11 , describes the embodiments of the present application in more detail. It should be noted that Figures 5 to 10 The examples are only intended to help those skilled in the art understand the embodiments of the present application, and are not intended to limit the embodiments of the present application to the specific values ​​or specific scenarios illustrated. Figures 5 to 10 It is obvious that various equivalent modifications or changes can be made, and such modifications or changes also fall within the scope of the embodiments of the present application. Figure 11 It is explained from the perspective of the interaction between the first node and the second node.

[0339] See also Figure 7 In step S1110, the first node receives the first information sent by the second node.

[0340] In step S1120, the first node determines a first mapping order. For example, the first node may determine a SSB-to-RO mapping relationship within a time period X through the first information.

[0341] In step S1130, the first node receives second information sent by the second node. The second information may indicate a value of Nr.

[0342] In step S1140, the first node determines multiple candidate RO sets within the first period. For example, the first node may determine multiple candidate RO sets within the time period X according to the received SSB parameters, the SSB-to-RO mapping relationship and Nr.

[0343] In step S1150, the first node receives first signaling sent by the second node. The first signaling includes a first PRACH mask index.

[0344] In step S1160, the second node determines the starting RO and the first RO set in the first RO set according to whether the first time offset is configured. For example, the first node determines the starting RO in the first RO set according to whether the first time offset is configured and the value configured for the first time offset. The configuration of the first time offset can jointly determine the starting RO with the number of SSBs, the first SSB index, and the first PRACH mask index. Further, the first node determines one or more ROs after the starting RO in the first RO set according to the SSB-to-RO mapping relationship, thereby determining the first RO set.

[0345] In step S1170, the first node sends a first PRACH transmission to the second node. The first node may perform the first PRACH transmission with multiple preamble repetitions on the first RO set.

[0346] In step S1180, the first node monitors the RAR within a random access response (RAR) time window. The first node may perform subsequent random access procedures after receiving the RAR corresponding to the first PRACH transmission.

[0347] As described above in conjunction with Figures 1 to 11 , the method embodiments of the present application have been described in detail. Below, in conjunction with Figures 12 to 15 , the apparatus embodiments of the present application will be described in detail. It should be understood that the descriptions of the method embodiments correspond to those of the apparatus embodiments. Therefore, for parts not described in detail, reference may be made to the previous method embodiments.

[0348] Figure 12 A first node for wireless communication provided by an embodiment of the present application. As Figure 12 shown, the first node 1200 includes a first transceiver 1210.

[0349] The first transceiver 1210 is configured to send a first PRACH transmission on the first RO set; wherein, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are continuous in the time domain, the first SSB index is one of multiple SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of multiple RO sets, the multiple RO sets correspond to the same frequency domain resource index, each RO set in the multiple RO sets includes Nr ROs, the first time offset is the time offset between any two adjacent RO sets in the multiple RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine the starting RO in the first RO set.

[0350] As an example, the first cycle includes a plurality of candidate ROs, and any RO in the plurality of RO sets belongs to the plurality of candidate ROs within the first cycle. The index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of candidate ROs within the first cycle; whether the first time offset is configured is used to determine the index of the starting RO in the first RO set.

[0351] As an example, when the first time offset is configured, the index of the starting RO in the first RO set is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

[0352] As an example, the first cycle includes a plurality of candidate RO sets, and any RO set in the plurality of RO sets is one of the plurality of candidate RO sets; whether the first time offset is configured is used to determine the index of the first RO set among the plurality of candidate RO sets.

[0353] As an example, when the first time offset is configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

[0354] As an example, the first transceiver 1210 is further configured to receive a first signaling, the first signaling includes a first PRACH mask index, wherein when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

[0355] As an example, the first transceiver 1210 is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs correspond one-to-one to the plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; the first mapping order is used for mapping the plurality of SSB indexes to a plurality of alternative ROs within a first period.

[0356] As an example, the first transceiver 1210 is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine mapping of the plurality of SSB indexes to a plurality of alternative ROs within a first period.

[0357] As an example, the first transceiver 1210 is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

[0358] As an example, the first transceiver 1210 may be a transceiver 1430, and the first node 1200 may further include a processor 1410 and a memory 1420, as specifically Figure 14 shown.

[0359] Figure 13 A second node for wireless communication provided in an embodiment of this application. As Figure 13 shown, the second node 1300 includes a second transceiver 1310.

[0360] The second transceiver 1310 is configured to receive a first PRACH transmission on a first RO set; where the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are consecutive in the time domain, the first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency domain resource index, each RO set in the plurality of RO sets includes Nr ROs, a first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine a starting RO in the first RO set.

[0361] As an example, the first period includes a plurality of candidate ROs. Any RO in the plurality of RO sets belongs to the plurality of candidate ROs within the first period. The index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of candidate ROs within the first period; whether the first time offset is configured is used to determine the index of the starting RO in the first RO set.

[0362] As an example, when the first time offset is configured, the index of the starting RO in the first RO set is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

[0363] As an example, the first period includes a plurality of candidate RO sets. Any RO set in the plurality of RO sets is one of the plurality of candidate RO sets; whether the first time offset is configured is used to determine the index of the first RO set among the plurality of candidate RO sets.

[0364] As an example, when the first time offset is configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

[0365] As an example, the second transceiver 1310 is further configured to send a first signaling, and the first signaling includes a first PRACH mask index. Wherein, when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

[0366] As an example, the second transceiver 1310 is further configured to send a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs correspond one-to-one to the plurality of SSB indexes, and the first SSB index is the index of the first SSB among the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

[0367] As an example, the second transceiver 1310 is further configured to send first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the plurality of SSB indexes are mapped to the plurality of alternative ROs within the first period.

[0368] As an example, the second transceiver 1310 is further configured to send second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

[0369] As an example, the second transceiver 1310 may be a transceiver 1430, and the second node 1300 may further include a processor 1410 and a memory 1420, as specifically Figure 14 shown.

[0370] Figure 14 is a schematic structural diagram of a communication device according to an embodiment of the present application. Figure 14 The dashed lines in the figure indicate that the unit or module is optional. The device 1400 can be used to implement the method described in the above method embodiment. The device 1400 can be a chip, a user equipment, or a network equipment.

[0371] Device 1400 may include one or more processors 1410. The processor 1410 may support the device 1400 in implementing the methods described in the foregoing method embodiments. The processor 1410 may be a general-purpose processor or a dedicated processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0372] Device 1400 may also include one or more memories 1420. A program is stored on the memory 1420, and the program may be executed by the processor 1410, so that the processor 1410 executes the methods described in the foregoing method embodiments. The memory 1420 may be independent of the processor 1410 or integrated in the processor 1410.

[0373] Device 1400 may also include a transceiver 1430. The processor 1410 may communicate with other devices or chips through the transceiver 1430. For example, the processor 1410 may transmit and receive data with other devices or chips through the transceiver 1430.

[0374] Figure 15 This is a schematic diagram of the hardware modules of the communication device provided in the embodiments of this application. Specifically, Figure 15 A block diagram showing a first communication device 1550 and a second communication device 1510 that communicate with each other in an access network is shown.

[0375] The first communication device 1550 includes a controller / processor 1559, a memory 1560, a data source 1567, a transmit processor 1568, a receive processor 1556, a multi-antenna transmit processor 1557, a multi-antenna receive processor 1558, a transmitter / receiver 1554, and an antenna 1552.

[0376] The second communication device 1510 includes a controller / processor 1575, a memory 1576, a data source 1577, a receive processor 1570, a transmit processor 1516, a multi-antenna receive processor 1572, a multi-antenna transmit processor 1571, a transmitter / receiver 1518, and an antenna 1520.

[0377] In the transmission from the second communication device 1510 to the first communication device 1550, at the second communication device 1510, upper layer data packets from the core network or from the data source 1577 are provided to the controller / processor 1575. The core network and the data source 1577 represent all protocol layers above the L2 layer. The controller / processor 1575 implements the functionality of the L2 layer. In the transmission from the second communication device 1510 to the first communication device 1550, the controller / processor 1575 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication device 1550 based on various priority metrics. The controller / processor 1575 is also responsible for retransmission of lost packets and signaling to the first communication device 1550. The transmit processor 1516 and the multi-antenna transmit processor 1571 implement various signal processing functions for the Ll layer (i.e., the physical layer). The transmit processor 1516 implements encoding and interleaving to facilitate forward error correction at the second communication device 1510, and mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying, quadrature phase shift keying, M-phase shift keying, M-quadrature amplitude modulation). The multi-antenna transmit processor 1571 performs digital space precoding on the encoded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, to generate one or more spatial streams. The transmit processor 1516 then maps each spatial stream to subcarriers, multiplexes with reference signals (e.g., pilots) in the time domain and / or frequency domain, and then uses the inverse fast Fourier transform to generate a physical channel carrying time-domain multi-carrier symbol streams. Subsequently, the multi-antenna transmit processor 1571 performs transmit analog precoding / beamforming operations on the time-domain multi-carrier symbol streams. Each transmitter 1518 converts the baseband multi-carrier symbol streams provided by the multi-antenna transmit processor 1571 into radio frequency streams and then provides them to different antennas 1520.

[0378] In the transmission from the second communication device 1510 to the first communication device 1550, at the first communication device 1550, each receiver 1554 receives signals via its respective antenna 1552. Each receiver 1554 recovers the information modulated onto the radio frequency carrier, and converts the radio frequency stream into a baseband multi-carrier symbol stream and provides it to the receive processor 1556. The receive processor 1556 and the multi-antenna receive processor 1558 perform various signal processing functions of the L1 layer. The multi-antenna receive processor 1558 performs receive analog precoding / beamforming operations on the baseband multi-carrier symbol stream from the receivers 1554. The receive processor 1556 uses the fast Fourier transform to convert the baseband multi-carrier symbol stream after the receive analog precoding / beamforming operations from the time domain to the frequency domain. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receive processor 1556, where the reference signal will be used for channel estimation, and the data signal recovers any spatial streams destined for the first communication device 1550 after multi-antenna detection in the multi-antenna receive processor 1558. The symbols on each spatial stream are demodulated and recovered in the receive processor 1556, and soft decisions are generated. Subsequently, the receive processor 1556 decodes and de-interleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 1510 on the physical channel. Subsequently, the upper layer data and control signals are provided to the controller / processor 1559. The controller / processor 1559 performs the functions of the L2 layer. The controller / processor 1559 may be associated with a memory 1560 that stores program code and data. The memory 1560 may be referred to as a computer-readable medium. In the transmission from the second communication device 1510 to the first communication device 1550, the controller / processor 1559 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover the upper layer data packets from the second communication device 1510. Subsequently, the upper layer data packets are provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 for L3 processing.

[0379] In the transmission from the first communication device 1550 to the second communication device 1510, at the first communication device 1550, an upper layer data packet is provided to the controller / processor 1559 using the data source 1567. The data source 1567 represents all protocol layers above the L2 layer. Similar to the transmission function described at the second communication device 1510 in the transmission from the second communication device 1510 to the first communication device 1550, the controller / processor 1559 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, and implements the L2 layer functions for the user plane and the control plane. The controller / processor 1559 is also responsible for retransmitting lost packets and signaling to the second communication device 1510. The transmit processor 1568 performs modulation mapping and channel coding processing. The multi-antenna transmit processor 1557 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing. Subsequently, the transmit processor 1568 modulates the generated spatial streams into multi-carrier / single-carrier symbol streams, and after passing through the analog precoding / beamforming operation in the multi-antenna transmit processor 1557, provides them to different antennas 1552 via the transmitter 1554. Each transmitter 1554 first converts the baseband symbol stream provided by the multi-antenna transmit processor 1557 into a radio frequency symbol stream and then provides it to the antenna 1552.

[0380] In the transmission from the first communication device 1550 to the second communication device 1510, the function at the second communication device 1510 is similar to the receiving function described at the first communication device 1550 in the transmission from the second communication device 1510 to the first communication device 1550. Each receiver 1518 receives a radio frequency signal through its corresponding antenna 1520, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to the multi-antenna receive processor 1572 and the receive processor 1570. The receive processor 1570 and the multi-antenna receive processor 1572 jointly implement the Ll layer functions. The controller / processor 1575 implements the L2 layer functions. The controller / processor 1575 may be associated with a memory 1576 that stores program code and data. The memory 1576 may be referred to as a computer-readable medium. In the transmission from the first communication device 1550 to the second communication device 1510, the controller / processor 1575 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover the upper layer data packet from the first communication device 1550. The upper layer data packet from the controller / processor 1575 may be provided to the core network or all protocol layers above the L2 layer, and various control signals may also be provided to the core network or L3 for L3 processing.

[0381] As an example, the first communication device 1550 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor, and the first communication device 1550 is at least: sending a first PRACH transmission on a first RO set; wherein, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are continuous in the time domain, the first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency domain resource index, each RO set in the plurality of RO sets includes Nr ROs, the first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine the starting RO in the first RO set.

[0382] As an example, the first communication device 1550 includes: a memory storing a computer-readable instruction program, the computer-readable instruction program generating actions when executed by at least one processor, the actions including: sending a first PRACH transmission on a first RO set; wherein, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are continuous in the time domain, the first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency domain resource index, each RO set in the plurality of RO sets includes Nr ROs, the first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine the starting RO in the first RO set.

[0383] As an example, the first communication device 1550 corresponds to the first node in this application.

[0384] As an example, the second communication device 1510 corresponds to the second node in this application.

[0385] As an example, the first communication device 1550 is a user equipment, and this user equipment can be used as a relay node.

[0386] As an example, the first communication device 1550 is a V2X-enabled user equipment, which can act as a relay node.

[0387] As an example, the first communication device 1550 is a D2D-enabled user equipment, which can act as a relay node.

[0388] As an example, the first communication device 1550 is a network control relay (NCR).

[0389] As an example, the first communication device 1550 is a relay repeater.

[0390] As an example, the first communication device 1550 is a relay.

[0391] As an example, the second communication device 1510 is a base station.

[0392] As an example, the antenna 1552, the transmitter 1554, the multi-antenna transmission processor 1557, the transmission processor 1568, and the controller / processor 1559 are used to send a first PRACH transmission on a first RO set.

[0393] As an example, the antenna 1520, the receiver 1518, the multi-antenna reception processor 1572, the reception processor 1570, and the controller / processor 1575 are used to receive a first PRACH transmission on a first RO set.

[0394] An embodiment of the present application further provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to the terminal or network device provided in the embodiment of the present application, and the program enables a computer to execute the methods performed by the terminal or network device in various embodiments of the present application.

[0395] An embodiment of the present application further provides a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal or network device provided in the embodiment of the present application, and the program enables a computer to execute the methods performed by the terminal or network device in various embodiments of the present application.

[0396] An embodiment of the present application further provides a computer program. The computer program can be applied to the terminal or network device provided in the embodiment of the present application, and the computer program enables a computer to execute the methods performed by the terminal or network device in various embodiments of the present application.

[0397] It should be understood that the terms "system" and "network" in this application may be used interchangeably. Additionally, the terms used in this application are only for explaining specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", "fourth", etc. in the specification, claims, and drawings of this application are used to distinguish different objects rather than to describe a specific order. Furthermore, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0398] In the embodiments of this application, the "indication" mentioned may be a direct indication, an indirect indication, or may also indicate an associated relationship. For example, A indicates B, which may mean that A directly indicates B. For example, B can be obtained through A; it may also mean that A indirectly indicates B. For example, A indicates C, and B can be obtained through C; it may also mean that there is an associated relationship between A and B.

[0399] In the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A. B can also be determined according to A and / or other information.

[0400] In the embodiments of this application, the term "correspond" may indicate a direct or indirect corresponding relationship between two parties, may also indicate an associated relationship between two parties, or may also be relationships such as indication and being indicated, configuration and being configured, etc.

[0401] In the embodiments of this application, "predefined" or "preconfigured" can be implemented by pre-saving corresponding codes, tables, or other means that can be used to indicate relevant information in a device (for example, including user equipment and network equipment). This application does not limit its specific implementation method. For example, predefined can refer to being defined in a protocol.

[0402] In the embodiments of this application, the "protocol" may refer to standard protocols in the communication field. For example, it may include LTE protocols, NR protocols, and related protocols applied to future communication systems. This application does not limit this.

[0403] In the embodiments of this application, the term "and / or" is merely a description of the associated relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may indicate: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0404] In various embodiments of this application, the magnitudes of the sequence numbers of the above processes do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic and should not impose any limitation on the implementation process of the embodiments of this application.

[0405] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0406] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0407] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0408] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, 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 processes or functions described in the embodiments of the present application are 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. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a digital video disc (DVD)), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0409] Those of ordinary skill in the art can understand that all or part of the steps in the above methods can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk, or an optical disc, etc. Optionally, all or part of the steps in the above embodiments can also be implemented using one or more integrated circuits. Correspondingly, each module unit in the above embodiments can be implemented in a hardware form or in the form of a software function module. This application is not limited to any specific form of the combination of software and hardware. The first node in this application includes, but is not limited to, wireless communication devices such as mobile phones, tablet computers, laptops, wireless network cards, low-power devices, enhanced machine-type communication (eMTC) devices, narrow band internet of things (NB-IoT) devices, vehicle-mounted communication devices, aircraft, airplanes, drones, and remote control airplanes. The second node in this application includes, but is not limited to, wireless communication devices such as mobile phones, tablet computers, laptops, wireless network cards, low-power devices, eMTC devices, NB-IoT devices, vehicle-mounted communication devices, aircraft, airplanes, drones, and remote control airplanes. The user equipment or UE or terminal in this application includes, but is not limited to, wireless communication devices such as mobile phones, tablet computers, laptops, wireless network cards, low-power devices, eMTC devices, NB-IoT devices, vehicle-mounted communication devices, aircraft, airplanes, drones, and remote control airplanes. The base station equipment or base station or network-side equipment in this application includes, but is not limited to, wireless communication devices such as macrocell base stations, microcell base stations, home base stations, relay base stations, eNBs, gNBs, TRPs, global navigation satellite systems (GNSS), relay satellites, satellite base stations, and aerial base stations.

[0410] As described above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A method in a first node for wireless communication, characterized in that, comprising: sending a first PRACH transmission on a first RO set; wherein, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are continuous in the time domain, a first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency domain resource index, each RO set in the plurality of RO sets includes Nr ROs, a first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine the starting RO in the first RO set.

2. The method according to claim 1, characterized in that, when the first time offset is configured, the first time offset is used to determine the starting RO in the first RO set.

3. The method according to claim 1 or 2, characterized in that, when the first time offset is not configured, the first time offset is not used to determine the starting RO in the first RO set.

4. The method according to claim 1, characterized in that, whether the first time offset is configured and the value configured for the first time offset are used to determine the starting RO in the first RO set.

5. The method according to claim 1, characterized in that, when the first time offset is configured, the number of ROs included in the first time offset is used to determine the starting RO in the first RO set.

6. The method according to claim 1, characterized in that, the number of ROs included in the first time offset is 4, or the number of ROs included in the first time offset is 8.

7. The method according to claim 1, characterized in that, a first period includes a plurality of alternative ROs, any RO in the plurality of RO sets belongs to the plurality of alternative ROs within the first period, the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of alternative ROs within the first period; whether the first time offset is configured is used to determine the index of the starting RO in the first RO set.

8. The method according to claim 7, characterized in that, when the first time offset is configured, the index of the starting RO in the first RO set is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index and Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is related to the number of the plurality of SSB indexes, the first SSB index and Nr.

9. The method according to claim 1, characterized in that, The first period includes a plurality of candidate RO sets, and any one of the plurality of RO sets is one of the plurality of candidate RO sets; whether the first time offset is configured is used to determine the index of the first RO set in the plurality of candidate RO sets.

10. The method according to claim 9, wherein, when the first time offset is configured, the index of the first RO set in the plurality of candidate RO sets is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the first RO set in the plurality of candidate RO sets is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

11. The method according to claim 1, wherein, the method further includes: receiving a first signaling, where the first signaling includes a first PRACH mask index; wherein, when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

12. The method according to claim 1, wherein, the method further includes: receiving a first SSB; wherein, the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs correspond one-to-one to the plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for mapping the plurality of SSB indexes to a plurality of candidate ROs within the first period.

13. The method according to claim 1, wherein, the method further includes: receiving a first information; wherein, the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine mapping of the plurality of SSB indexes to a plurality of candidate ROs within the first period.

14. The method according to claim 1, wherein, the method further includes: receiving a second information; wherein, the second information includes Nr, and Nr is one of 2, 4, and 8.

15. A method in a second node for wireless communication, wherein, includes: receiving a first PRACH transmission on a first RO set; Among them, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are continuous in the time domain, the first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency domain resource index, each RO set in the plurality of RO sets includes Nr ROs, the first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine the starting RO in the first RO set.

16. The method according to claim 15, wherein, when the first time offset is configured, the first time offset is used to determine the starting RO in the first RO set.

17. The method according to claim 15 or 16, wherein, when the first time offset is not configured, the first time offset is not used to determine the starting RO in the first RO set.

18. The method according to claim 15, wherein, whether the first time offset is configured and the value configured for the first time offset are used to determine the starting RO in the first RO set.

19. The method according to claim 15, wherein, when the first time offset is configured, the number of ROs included in the first time offset is used to determine the starting RO in the first RO set.

20. The method according to claim 15, wherein, the number of ROs included in the first time offset is 4, or the number of ROs included in the first time offset is 8.

21. The method according to claim 15, wherein, the first period includes a plurality of candidate ROs, any RO in the plurality of RO sets belongs to the plurality of candidate ROs within the first period, and the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of candidate ROs within the first period; whether the first time offset is configured is used to determine the index of the starting RO in the first RO set.

22. The method according to claim 21, wherein, when the first time offset is configured, the index of the starting RO in the first RO set is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

23. The method according to claim 15, wherein, The first period includes a plurality of alternative RO sets, and any one of the plurality of RO sets is one of the plurality of alternative RO sets; whether the first time offset is configured is used to determine the index of the first RO set among the plurality of alternative RO sets.

24. The method according to claim 23, wherein, when the first time offset is configured, the index of the first RO set among the plurality of alternative RO sets is related to the number of ROs included in the first time offset, the number of the plurality of SSB indices, the first SSB index, and Nr; when the first time offset is not configured, the index of the first RO set among the plurality of alternative RO sets is related to the number of the plurality of SSB indices, the first SSB index, and Nr.

25. The method according to claim 15, wherein, the method further includes: sending a first signaling, where the first signaling includes a first PRACH mask index; wherein, when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

26. The method according to claim 15, wherein, the method further includes: sending a first SSB; wherein, the first SSB is one of the plurality of SSBs included in a first SSB set, the plurality of SSBs are in one-to-one correspondence with the plurality of SSB indices, and the first SSB index is the index of the first SSB among the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indices to be mapped to a plurality of alternative ROs within the first period.

27. The method according to claim 15, wherein, the method further includes: sending a first information; wherein, the first information is used to indicate the number of SSB indices associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine the mapping of the plurality of SSB indices to the plurality of alternative ROs within the first period.

28. The method according to claim 15, wherein, the method further includes: sending a second information; wherein, the second information includes Nr, and Nr is one of 2, 4, and 8.

29. A first node for wireless communication, wherein, comprising: a first transceiver, configured to send a first PRACH transmission on a first RO set; Among them, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are continuous in the time domain, the first SSB index is one of multiple SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of multiple RO sets, the multiple RO sets correspond to the same frequency-domain resource index, each RO set in the multiple RO sets includes Nr ROs, the first time offset is the time offset between any two adjacent RO sets in the multiple RO sets, the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine the starting RO in the first RO set.

30. The first node according to claim 29, wherein, when the first time offset is configured, the first time offset is used to determine the starting RO in the first RO set.

31. The first node according to claim 29 or 30, wherein, when the first time offset is not configured, the first time offset is not used to determine the starting RO in the first RO set.

32. The first node according to claim 29 or 30, wherein, whether the first time offset is configured and the value configured for the first time offset are used to determine the starting RO in the first RO set.

33. The first node according to claim 31, wherein, whether the first time offset is configured and the value configured for the first time offset are used to determine the starting RO in the first RO set.

34. The first node according to any one of claims 29 - 30, 33, wherein, when the first time offset is configured, the number of ROs included in the first time offset is used to determine the starting RO in the first RO set.

35. The first node according to claim 31, wherein, when the first time offset is configured, the number of ROs included in the first time offset is used to determine the starting RO in the first RO set.

36. The first node according to claim 32, wherein, when the first time offset is configured, the number of ROs included in the first time offset is used to determine the starting RO in the first RO set.

37. The first node according to any one of claims 29 - 30, 33, 35 - 36, wherein, the number of ROs included in the first time offset is 4, or the number of ROs included in the first time offset is 8.

38. The first node according to claim 31, wherein, the number of ROs included in the first time offset is 4, or the number of ROs included in the first time offset is 8.

39. The first node according to claim 32, wherein, the number of ROs included in the first time offset is 4, or the number of ROs included in the first time offset is 8.

40. The first node according to claim 34, wherein, the number of ROs included in the first time offset is 4, or the number of ROs included in the first time offset is 8.

41. The first node according to any one of claims 29-30, 33, 35-36, 38-40, wherein, the first period includes a plurality of alternative ROs, any RO in the plurality of RO sets belongs to the plurality of alternative ROs within the first period, and the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of alternative ROs within the first period; whether the first time offset is configured to determine the index of the starting RO in the first RO set.

42. The first node according to claim 31, wherein, the first period includes a plurality of alternative ROs, any RO in the plurality of RO sets belongs to the plurality of alternative ROs within the first period, and the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of alternative ROs within the first period; whether the first time offset is configured to determine the index of the starting RO in the first RO set.

43. The first node according to claim 32, wherein, the first period includes a plurality of alternative ROs, any RO in the plurality of RO sets belongs to the plurality of alternative ROs within the first period, and the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of alternative ROs within the first period; whether the first time offset is configured to determine the index of the starting RO in the first RO set.

44. The first node according to claim 34, wherein, the first period includes a plurality of alternative ROs, any RO in the plurality of RO sets belongs to the plurality of alternative ROs within the first period, and the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of alternative ROs within the first period; whether the first time offset is configured to determine the index of the starting RO in the first RO set.

45. The first node according to claim 37, wherein, the first period includes a plurality of alternative ROs, any RO in the plurality of RO sets belongs to the plurality of alternative ROs within the first period, and the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of alternative ROs within the first period; whether the first time offset is configured to determine the index of the starting RO in the first RO set.

46. The first node according to claim 41, wherein, When the first time offset is configured, the index of the starting RO in the first RO set is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

47. The first node according to any one of claims 42-45, wherein, When the first time offset is configured, the index of the starting RO in the first RO set is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

48. The first node according to any one of claims 29-30, 33, 35-36, 38-40, 42-46, wherein, The first period includes a plurality of alternative RO sets, and any one of the plurality of RO sets is one of the plurality of alternative RO sets; whether the first time offset is configured is used to determine the index of the first RO set in the plurality of alternative RO sets.

49. The first node according to claim 31, wherein, The first period includes a plurality of alternative RO sets, and any one of the plurality of RO sets is one of the plurality of alternative RO sets; whether the first time offset is configured is used to determine the index of the first RO set in the plurality of alternative RO sets.

50. The first node according to claim 32, wherein, The first period includes a plurality of alternative RO sets, and any one of the plurality of RO sets is one of the plurality of alternative RO sets; whether the first time offset is configured is used to determine the index of the first RO set in the plurality of alternative RO sets.

51. The first node according to claim 34, wherein, The first period includes a plurality of alternative RO sets, and any one of the plurality of RO sets is one of the plurality of alternative RO sets; whether the first time offset is configured is used to determine the index of the first RO set in the plurality of alternative RO sets.

52. The first node according to claim 37, wherein, The first period includes a plurality of alternative RO sets, and any one of the plurality of RO sets is one of the plurality of alternative RO sets; whether the first time offset is configured is used to determine the index of the first RO set in the plurality of alternative RO sets.

53. The first node according to claim 41, wherein, The first period includes a plurality of candidate RO sets, and any one of the plurality of RO sets is one of the plurality of candidate RO sets; whether the first time offset is configured is used to determine the index of the first RO set among the plurality of candidate RO sets.

54. The first node according to claim 47, wherein, The first period includes a plurality of candidate RO sets, and any one of the plurality of RO sets is one of the plurality of candidate RO sets; whether the first time offset is configured is used to determine the index of the first RO set among the plurality of candidate RO sets.

55. The first node according to claim 48, wherein, When the first time offset is configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

56. The first node according to any one of claims 49-54, wherein, When the first time offset is configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

57. The first node according to any one of claims 29-30, 33, 35-36, 38-40, 42-46, 49-55, wherein, The first transceiver is further configured to receive a first signaling, the first signaling includes a first PRACH mask index, wherein, when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

58. The first node according to claim 31, wherein, The first transceiver is further configured to receive a first signaling, the first signaling includes a first PRACH mask index, wherein, when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

59. The first node according to claim 32, wherein, The first transceiver is further configured to receive a first signaling, the first signaling including a first PRACH mask index, wherein when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

60. The first node according to claim 34, wherein: The first transceiver is further configured to receive a first signaling, the first signaling including a first PRACH mask index, wherein when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

61. The first node according to claim 37, wherein: The first transceiver is further configured to receive a first signaling, the first signaling including a first PRACH mask index, wherein when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

62. The first node according to claim 41, wherein: The first transceiver is further configured to receive a first signaling, the first signaling including a first PRACH mask index, wherein when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

63. The first node according to claim 47, wherein: The first transceiver is further configured to receive a first signaling, the first signaling including a first PRACH mask index, wherein when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

64. The first node according to claim 48, wherein: The first transceiver is further configured to receive a first signaling, the first signaling including a first PRACH mask index, wherein when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

65. The first node according to claim 56, wherein: The first transceiver is further configured to receive a first signaling, where the first signaling includes a first PRACH mask index. When the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

66. The first node according to any one of claims 29 - 30, 33, 35 - 36, 38 - 40, 42 - 46, 49 - 55, 58 - 65, wherein, the first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs are in one-to-one correspondence with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

67. The first node according to claim 31, wherein, the first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs are in one-to-one correspondence with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

68. The first node according to claim 32, wherein, the first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs are in one-to-one correspondence with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

69. The first node according to claim 34, wherein, the first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs are in one-to-one correspondence with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

70. The first node according to claim 37, wherein, The first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs correspond one-to-one with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

71. The first node according to claim 41, wherein, The first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs correspond one-to-one with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

72. The first node according to claim 47, wherein, The first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs correspond one-to-one with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

73. The first node according to claim 48, wherein, The first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs correspond one-to-one with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

74. The first node according to claim 56, wherein, The first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs correspond one-to-one with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

75. The first node according to claim 57, wherein, The first transceiver is further configured to receive a first SSB, where the first SSB is one of a plurality of SSBs included in a first SSB set, the plurality of SSBs are in one-to-one correspondence with a plurality of SSB indexes, and the first SSB index is the index of the first SSB in the plurality of SSBs included in the first SSB set; a first mapping order is used for mapping the plurality of SSB indexes to a plurality of alternative ROs within a first period.

76. The first node according to any one of claims 29-30, 33, 35-36, 38-40, 42-46, 49-55, 58-65, 67-75, wherein, the first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the plurality of SSB indexes are mapped to a plurality of alternative ROs within a first period.

77. The first node according to claim 31, wherein, the first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the plurality of SSB indexes are mapped to a plurality of alternative ROs within a first period.

78. The first node according to claim 32, wherein, the first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the plurality of SSB indexes are mapped to a plurality of alternative ROs within a first period.

79. The first node according to claim 34, wherein, the first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the plurality of SSB indexes are mapped to a plurality of alternative ROs within a first period.

80. The first node according to claim 37, wherein, the first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the plurality of SSB indexes are mapped to a plurality of alternative ROs within a first period.

81. The first node according to claim 41, wherein, The first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the multiple SSB indexes are mapped to multiple alternative ROs within a first period.

82. The first node according to claim 47, wherein, The first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the multiple SSB indexes are mapped to multiple alternative ROs within a first period.

83. The first node according to claim 48, wherein, The first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the multiple SSB indexes are mapped to multiple alternative ROs within a first period.

84. The first node according to claim 56, wherein, The first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the multiple SSB indexes are mapped to multiple alternative ROs within a first period.

85. The first node according to claim 57, wherein, The first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the multiple SSB indexes are mapped to multiple alternative ROs within a first period.

86. The first node according to claim 66, wherein, The first transceiver is further configured to receive first information, where the first information is used to indicate the number of SSB indexes associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine that the multiple SSB indexes are mapped to multiple alternative ROs within a first period.

87. The first node according to any one of claims 29-30, 33, 35-36, 38-40, 42-46, 49-55, 58-65, 67-75, 77-86, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

88. The first node according to claim 31, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

89. The first node according to claim 32, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

90. The first node according to claim 34, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

91. The first node according to claim 37, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

92. The first node according to claim 41, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

93. The first node according to claim 47, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

94. The first node according to claim 48, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

95. The first node according to claim 56, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

96. The first node according to claim 57, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

97. The first node according to claim 66, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

98. The first node according to claim 76, wherein, The first transceiver is further configured to receive second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

99. A second node for wireless communication, wherein, comprising: A second transceiver for receiving a first PRACH transmission on a first RO set; Among them, the first RO set includes Nr ROs, the first PRACH transmission includes Nr preamble repetitions, the Nr ROs in the first RO set are continuous in the time domain, the first SSB index is one of a plurality of SSB indexes, the Nr ROs in the first RO set are associated with the first SSB index, the first RO set is one of a plurality of RO sets, the plurality of RO sets correspond to the same frequency domain resource index, each RO set in the plurality of RO sets includes Nr ROs, the first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured is used to determine the starting RO in the first RO set.

100. The second node according to claim 99, wherein, when the first time offset is configured, the first time offset is used to determine the starting RO in the first RO set.

101. The second node according to claim 100, wherein, when the first time offset is not configured, the first time offset is not used to determine the starting RO in the first RO set.

102. The second node according to claim 101, wherein, whether the first time offset is configured and the value configured for the first time offset are used to determine the starting RO in the first RO set.

103. The second node according to claim 102, wherein, when the first time offset is configured, the number of ROs included in the first time offset is used to determine the starting RO in the first RO set.

104. The second node according to claim 103, wherein, the number of ROs included in the first time offset is 4, or the number of ROs included in the first time offset is 8.

105. The second node according to claim 104, wherein, the first period includes a plurality of candidate ROs, any RO in the plurality of RO sets belongs to the plurality of candidate ROs within the first period, and the index of the starting RO in the first RO set is the index of the starting RO in the first RO set among the plurality of candidate ROs within the first period; whether the first time offset is configured is used to determine the index of the starting RO in the first RO set.

106. The second node according to claim 105, wherein, when the first time offset is configured, the index of the starting RO in the first RO set is related to the number of ROs included in the first time offset, the number of the plurality of SSB indexes, the first SSB index, and Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is related to the number of the plurality of SSB indexes, the first SSB index, and Nr.

107. The second node according to claim 106, wherein, The first period includes a plurality of candidate RO sets, and any one of the plurality of RO sets is one of the plurality of candidate RO sets; whether the first time offset is configured is used to determine the index of the first RO set among the plurality of candidate RO sets.

108. The second node according to claim 107, wherein, when the first time offset is configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of ROs included in the first time offset, the number of the plurality of SSB indices, the first SSB index, and Nr; when the first time offset is not configured, the index of the first RO set among the plurality of candidate RO sets is related to the number of the plurality of SSB indices, the first SSB index, and Nr.

109. The second node according to claim 108, wherein, the second transceiver is further configured to send a first signaling, the first signaling includes a first PRACH mask index, wherein, when the first time offset is configured, the starting RO in the first RO set is related to both the first time offset and the first PRACH mask index; when the first time offset is not configured, the starting RO in the first RO set is related to the first PRACH mask index.

110. The second node according to claim 109, wherein, the second transceiver is further configured to send a first SSB, wherein the first SSB is one of the plurality of SSBs included in a first SSB set, the plurality of SSBs correspond to the plurality of SSB indices one by one, and the first SSB index is the index of the first SSB among the plurality of SSBs included in the first SSB set; a first mapping order is used for mapping the plurality of SSB indices to a plurality of candidate ROs within the first period.

111. The second node according to claim 110, wherein, the second transceiver is further configured to send a first information, wherein the first information is used to indicate the number of SSB indices associated with one RO and the number of preambles corresponding to each SSB index of each RO, and the first information and the first mapping order are used to determine mapping of the plurality of SSB indices to the plurality of candidate ROs within the first period.

112. The second node according to claim 111, wherein, the second transceiver is further configured to send a second information, wherein the second information includes Nr, and Nr is one of 2, 4, and 8.

113. A node for use in wireless communication, wherein, comprising a transceiver, a memory, and a processor, the memory is configured to store programs, and the processor is configured to call the programs in the memory and control the transceiver to receive or send signals, so that the node executes the method according to any one of claims 1 - 14 or 15 - 28.

114. A communication device, wherein, including a processor for calling a program from a memory to cause the communication device to perform the method according to any one of claims 1-14 or 15-28.

115. A chip, characterized in that it includes a processor for calling a program from a memory to cause a device installed with the chip to perform the method according to any one of claims 1-14 or 15-28.

116. A computer-readable storage medium, characterized in that a program is stored thereon, and the program causes a computer to perform the method according to any one of claims 1-14 or 15-28.

117. A computer program product, characterized in that it includes a program, and the program causes a computer to perform the method according to any one of claims 1-14 or 15-28.

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