Methods for node used for wireless communications, and apparatus

Abstract

The present application provides methods for a node used for wireless communications, and an apparatus. A method comprises: transmitting a first PRACH transmission on a first RO set, the first RO set comprising Nr ROs, the first PRACH transmission comprising Nr preamble repetitions, the Nr ROs in the first RO set being consecutive in the time domain, a first SSB index being one of a plurality of SSB indexes, the Nr ROs in the first RO set being associated with the first SSB index, the first RO set being one of a plurality of RO sets, the plurality of RO sets corresponding to the same frequency domain resource index, each of the plurality of RO sets comprising Nr ROs, a first time offset being a time offset between any two adjacent RO sets amongst the plurality of RO sets, the first time offset comprising a positive integer number of ROs, and whether the first time offset is configured being used for determining a start RO in the first RO set.

Description

Method and apparatus in a node for wireless communication Technical Field

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

[0002] To enhance random access coverage, some communication systems (e.g., new radio (NR) systems) plan to introduce physical random access channel (PRACH) transmissions with multiple preamble repetitions. Under certain random access mechanisms (e.g., contention-free random access (CFRA)), a starting PRACH occasion set (RO) in a PRACH occasion set (ROSet, also known as an RO set) occupied by multiple preamble repetitions is typically determined based on a PRACH mask index, thereby determining the PRACH occasion set.

[0003] However, the PRACH mask index may not indicate all RO sets. Furthermore, the RO set 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.

[0004] Summary of the Invention

[0005] The present application provides a method and apparatus in a node for wireless communication. The following introduces various aspects of the present application.

[0006] In a first aspect, a method is provided in a first node for wireless communication, 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 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, a first time offset is the time offset between any two adjacent RO sets in the multiple RO sets, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured to be used to determine the starting RO in the first RO set.

[0007] In a second aspect, a method is provided in a second node for wireless communication, comprising: 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 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, a first time offset is the time offset between any two adjacent RO sets in the multiple RO sets, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured to be used to determine the starting RO in the first RO set.

[0008] According to a third aspect, a first node for wireless communication is provided, characterized in that it includes: a first transceiver, used 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 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, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured to be used to determine the starting RO in the first RO set.

[0009] In a fourth aspect, a second node for wireless communication is provided, characterized in that it includes: a second transceiver, used 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 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, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured to be used to determine the starting RO in the first RO set.

[0010] In a fifth aspect, a first node used for wireless communication is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the first node executes the method described in the first aspect.

[0011] In the sixth aspect, a second node used for wireless communication is provided, comprising a transceiver, a memory and a processor, wherein the memory is used to store programs, the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the second node executes the method described in the second aspect.

[0012] In a seventh aspect, an embodiment of the present application provides a communication system, the system including the first node and / or the second node described above. In another possible design, the system may also include other devices that interact with the first node or the second node in the solution provided in the embodiment of the present application.

[0013] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program enables a computer to execute part or all of the steps in the methods of the above aspects.

[0014] In a 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, wherein the computer program is operable to cause a computer to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0015] In the 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.

[0016] In an embodiment of the present application, a first node sends a first PRACH transmission on a first RO set among multiple RO sets. A starting RO in the first RO set is determined based on whether a first time offset associated with the multiple RO sets is configured, which can reduce or avoid conflicts with PRACH transmissions of a contention-based random access (CBRA) mechanism.

[0017] In the embodiment of the present application, the first node can further determine the initial RO in the first RO set according to the configuration of the first time offset based on the starting RO indicated by the PRACH mask index, thereby increasing the flexibility of the RO set indicated by the PRACH mask index.

[0018] In the 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. Therefore, the first node can optimize resource allocation for PRACH transmissions with multiple preamble repetitions.

[0019] 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 a first PRACH transmission with multiple preamble repetitions, which not only helps to improve the performance gain of PRACH transmission and increase the coverage range, but also helps to reduce random access delay and improve random access resource utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a diagram illustrating an example of a system architecture of a wireless communication system to which an embodiment of the present application may be applied.

[0021] FIG2 is a schematic diagram of an implementation method for determining a starting RO of an RO set according to a PRACH mask index.

[0022] FIG3 is a schematic diagram of another implementation of determining a starting RO of an RO set according to a PRACH mask index.

[0023] FIG4 is a schematic diagram of time offsets corresponding to different numbers of preamble repetitions.

[0024] FIG5 is a schematic flow chart of a method in a first node for wireless communication provided in an embodiment of the present application.

[0025] FIG. 6 is a schematic diagram of several possible preamble formats corresponding to preamble repetition in the method shown in FIG. 5 .

[0026] FIG. 7 is a schematic diagram of a first time offset in the method shown in FIG. 5 .

[0027] FIG8 is a schematic diagram of a possible implementation of the method shown in FIG5 .

[0028] FIG9 is a schematic diagram of another possible implementation of the method shown in FIG5 .

[0029] FIG10 is a schematic diagram of another possible implementation of the method shown in FIG5 .

[0030] FIG11 is a flow chart of a possible implementation of the method shown in FIG5 .

[0031] FIG12 is a schematic structural diagram of a first node for wireless communication provided in an embodiment of the present application.

[0032] FIG13 is a schematic structural diagram of a second node for wireless communication provided in an embodiment of the present application.

[0033] FIG14 is a schematic structural diagram of the device provided in an embodiment of the present application.

[0034] FIG15 is a schematic diagram of the hardware modules of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] Communication system architecture

[0036] FIG1 is a diagram illustrating an exemplary system architecture of a wireless communication system 100 to which embodiments of the present application may 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 geographic area and may communicate with the user equipment 120 located within the coverage area.

[0037] FIG1 exemplarily shows a network device and two user devices. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include another number of user devices within its coverage area, which is not limited in the embodiments of the present application.

[0038] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0039] 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, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0040] 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, 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 refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects, and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The user equipment in the embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, 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 to act 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 example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through the base station.

[0041] The network device in the embodiments of the present application may be a device for communicating with a user equipment, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects the user equipment to a wireless network. Base station can broadly cover various names as follows, or replace the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (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, baseband 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, micro base station, relay node, donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip used to be set in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs base station functions in device-to-device D2D, vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. The base station can support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network equipment.

[0042] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0043] 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 may include a CU and a DU. The gNB may also include an AAU.

[0044] The network equipment and user equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water; can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and user equipment are located.

[0045] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0046] It should be understood that the interpretation of the terminology in the embodiments of the present application can refer to the specification protocols TS36 series, TS37 series and TS38 series of the 3rd Generation Partnership Project (3GPP), but can also refer to the specification protocols of the Institute of Electrical and Electronics Engineers (IEEE).

[0047] For ease of understanding, some relevant technical knowledge involved in the embodiments of this application is first introduced. The following related technologies can be combined with the technical solutions of the embodiments of this application as optional solutions, and they all fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least part of the following contents.

[0048] Coverage enhancement of PRACH transmission

[0049] The coverage performance of a communication system (e.g., a NR system) is an important factor that operators need to consider when commercially deploying communication networks. This is because the coverage performance of a communication system directly affects the service quality of the communication system and the operator's costs, such as the operator's capital expenditure (CAPEX) and operating expense (OPEX).

[0050] The coverage performance of a communication system varies depending on the frequency band in which it operates. For example, compared to LTE, NR systems can operate at higher frequencies (such as millimeter wave bands). This results in greater path loss for NR systems operating at higher frequencies, leading to relatively poorer coverage performance in these bands. Therefore, as communication systems support increasingly higher frequency bands, how to enhance coverage becomes a pressing issue.

[0051] In most real-world deployment scenarios, uplink (UL) coverage is a bottleneck for enhancing communication system coverage, as user equipment (UE) capabilities are weaker than those of network equipment. However, with the advancement of communication technology, uplink traffic is increasing in emerging vertical use cases, such as video uploading. In these scenarios, enhancing uplink coverage is a challenge that needs further investigation.

[0052] In related technologies, coverage enhancement solutions already exist for certain uplinks. For example, NR release 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 procedure.

[0053] However, Rel-17 did not design a coverage enhancement solution for PRACH. However, PRACH transmission performance is very important for many processes such as initial access and beam failure recovery. Therefore, PRACH coverage enhancement is also very important. 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 key topics of this work item.

[0054] To improve the coverage performance of PRACH transmission, NR release 18 (Rel-18) plans to introduce a PRACH transmission with multiple preamble repetitions (a PRACH transmission with multiple preamble repetitions), also known as multiple PRACH transmission. In this technical feature, the UE can use the same transmit spatial filter (Tx spatial filter) on multiple resources to send multiple PRACH formats with preamble repetitions. In other words, the UE can send multiple PRACH formats with preamble repetitions through the same transmit beam.

[0055] Furthermore, for PRACH transmissions with multiple preamble repetitions, a PRACH opportunity set (ROSet, RO set) is associated with the same synchronization signal / physical broadcast channel block index (SS / PBCH block index, SSB index). The RO set typically 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 resources 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.

[0056] It should be noted that in the embodiment of the present application, SSB can represent a synchronization signal / physical broadcast channel block (SS / PBCH block) or a synchronization signal block (synchronization signal block), which is not limited here.

[0057] Furthermore, the RO set is configured or determined within a time period X. That is, the configured or determined RO set is repeated in units of time period X. Optionally, the time period X may include K SSB-to-RO association pattern periods.

[0058] As a possible implementation, if one or more preamble repetitions in a PRACH transmission with multiple preamble repetitions are dropped due to resource conflict, the dropped preamble repetitions are no longer deferred for transmission.

[0059] It should be noted that the RO mentioned above refers to the time-frequency resources that can be used for PRACH preamble transmission. In addition, 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. For example, one parameter is msg1-FDM. The other parameter is ssb-perRACH-Occasion or ssb-perRACH-OccasionAndCB-PreamblesPerSSB or msgA-SSB-PerRACH-OccasionAndCB-PreamblesPerSSB.

[0060] The parameter msg1-FDM can indicate the number of RO(s) frequency division multiplexed (FDMed) in 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.

[0061] PRACH mask index

[0062] In some communication systems (e.g., NR), the UE's physical random access procedure 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 collisions, the gNB / eNB can specify the resources for the UE's PRACH transmission by configuring a PRACH mask index.

[0063] For example, the PRACH mask index can specify which RO(s) within a system frame the UE performs PRACH transmission on. In 3GPP TS 38.321, these RO(s) can be associated with a specified or selected SSB index, as shown in Table 1. As mentioned above, the PRACH opportunity in Table 1 is the RO, and the PRACH opportunity index is also the RO index.

[0064] Table 1

[0065] In some embodiments, when 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 SSB index associated therewith, 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). In addition, DCI format 1_0 also indicates the DCI format identifier (identifier for DCI formats), frequency domain resource assignment (frequency domain resource assignment), random access preamble index (random access preamble index), uplink (UL) or supplementary uplink (supplementary uplink) indicator (indicator) and reserved bits.

[0066] Table 2

[0067] In some embodiments, when PRACH transmission is triggered by a higher layer, a PRACH mask index may 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.

[0068] In the NR system, ROs are mapped continuously to each SSB index. Furthermore, in each SSB-to-RO mapping cycle, the RO order 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.

[0069] Optionally, the PRACH mask index may indicate RO(s) for the same SSB.

[0070] Optionally, the PRACH mask index is used to indicate the starting RO in the RO set corresponding to the SSB index.

[0071] As mentioned above, NR Rel-18 introduces a PRACH transmission or multiple PRACH transmission with multiple preamble repetitions on an RO set. In this technology, the UE needs to select an RO set. The RO set contains multiple available ROs that are time-division multiplexed (TDMed).

[0072] When the UE selects an RO set for an SSB index based on the PRACH mask index, it can be selected in the following two ways.

[0073] In Option 1, all RO sets within time period X are first determined. One or more of these determined RO sets are then selected for sending preamble repeats. A PRACH mask index is then used to indicate the starting RO of the RO set. Based on the RO set in which the starting RO resides, the RO set used for sending preamble repeats is determined. Thus, Option 1 employs a grouping-first, mask-second selection approach.

[0074] The following is an exemplary description of the method of selecting 1 in conjunction with the mapping relationship between SSB and RO shown in Figure 2. In the example of Figure 2, it is assumed that there are two SSB beams, and the SSB indexes corresponding to the two SSB beams are SSB0 and SSB1.

[0075] As shown in Figure 2, time period X contains three PRACH slots. The number of time-division multiplexed ROs in each PRACH slot is 3. In the frequency domain, the number of frequency-division multiplexed ROs is 4. Therefore, there are 12 ROs corresponding to SSB0 or ​​SSB1 in each PRACH slot. Figure 2 shows the SSB index associated with each RO (RO associated with SSBx).

[0076] As shown in Figure 2, the RO Set size is 4. Because the four ROs within an RO Set are time-division multiplexed, the multiple RO Sets within time period X are shown as dashed boxes in Figure 2. Each dashed box represents an RO Set. This shows that within time period X, all RO Sets have been determined.

[0077] Continuing with Figure 2, the PRACH mask index has a value of 1. The PRACH mask index indicates that the starting RO in the RO set is RO#1. Therefore, the RO set indicated by the PRACH mask index includes four shaded ROs: RO#1, RO#5, RO#9, and RO#13.

[0078] As shown in Table 1 above, the PRACH mask index indication field is limited. Therefore, the PRACH mask index may not be able to independently indicate certain RO sets. For example, the PRACH mask index indication field cannot indicate the RO set starting with any of ROs RO#17 to RO#20 in Figure 2. Furthermore, the larger the RO set size, the larger the index of the starting RO of the RO set, thus limiting the RO sets that can be indicated by the PRACH mask index.

[0079] 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 an RO set. The subsequent RO(s) of the starting RO and the starting RO form an RO set. Therefore, Option 2 adopts a mask-first, grouping-second selection approach.

[0080] The following is an exemplary description of option 2 with reference to the mapping relationship between SSBs and ROs shown in Figure 3. 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.

[0081] As shown in Figure 3, the PRACH mask index value is 5. The PRACH mask index indicates that the starting RO in the RO set is RO#5. Since the RO set size is 4, the RO set determined by the PRACH mask index is shown as the dotted box in Figure 3. That is, the RO set indicated by the PRACH mask index includes the four shaded ROs: RO#5, RO#9, RO#13, and RO#17.

[0082] As shown in Figure 3, in Option 2, the formation of RO sets has a higher degree of freedom. Although the indication field of the PRACH mask index is limited, the PRACH mask index can indicate a larger number of RO sets compared to Option 1. However, the system not only has PRACH transmissions indicated by the PRACH mask index, but also RO sets selected by the UE that are not indicated by the PRACH mask index. Therefore, when the formation of the RO set indicated by the PRACH mask index is too flexible, it may cause conflicts with PRACH transmissions on RO sets selected by the UE that are not indicated by the PRACH mask index, thereby affecting system performance.

[0083] For example, the UE's self-selected non-PRACH mask index indication may be an indication method in the CBRA mechanism.

[0084] Time offset of RO set

[0085] A PRACH transmission with multiple preamble repetitions requires multiple ROs in the RO set in one transmission, which can easily cause preamble collisions when the total number of ROs is limited.

[0086] To reduce the probability of preamble collisions, the density of RO sets needs to be controlled. 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 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.

[0087] The time offset of an RO set includes multiple consecutive valid ROs. The time offset (i.e., the number of consecutive valid ROs) can be provided by RRC layer signaling (e.g., TimeOffsetBetweenStartingRO). The corresponding values ​​of the time offset for PRACH transmissions with different numbers of preamble repetitions were agreed upon in the RAN1#115 meeting. Referring to Figure 4, for a PRACH transmission with two preamble repetitions, the time offset can be one of 4, 8, or 16; for a PRACH transmission with four preamble repetitions, the time offset can be 8 or 16; and for a PRACH transmission with eight preamble repetitions, the time offset can only be 16.

[0088] When the time offset between RO sets is configured, due to the limitation of the PRACH mask index indication field, even if option 1 (i.e., forming multiple RO sets first and then using PRACH mask index indication) is adopted, the available RO sets that can be indicated by the PRACH mask index are more limited because the index value of the starting RO of the RO set at the time offset is relatively large.

[0089] In summary, after the introduction of PRACH transmission with multiple preamble repetitions and time offset, the RO set indicated by option 1 may be limited due to the limited indication field of the PRACH mask index. When option 2 is adopted, the RO set indicated by the PRACH mask index may conflict with the PRACH transmission of other mechanisms.

[0090] Therefore, in PRACH transmissions indicated by the PRACH mask index, how to indicate the RO set for a PRACH transmission with multiple preamble repetitions is a technical issue that needs to be studied. In particular, under the CFRA mechanism, how to effectively indicate the RO set for a PRACH transmission with multiple preamble repetitions is a technical issue that needs to be solved urgently.

[0091] Furthermore, how to effectively indicate the time-frequency resources or RO set of PRACH transmission with multiple preamble repetitions through the PRACH mask index and how to deal with the problem of limited PRACH mask index indication field are technical issues that need to be solved.

[0092] Furthermore, in the case where there is a time offset between RO sets, how to use a limited PRACH mask index indication field to indicate more valid RO sets is also a technical issue that needs to be considered.

[0093] In order to solve the above problems, an embodiment of the present application provides a method and apparatus in a node for wireless communication. In the method, a first node (e.g., UE) sends a first PRACH transmission with Nr preamble repetitions on a first RO set. The first node can determine the initial RO in the first RO set based on whether the first time offset is configured, which helps to solve the problem of limited PRACH mask index indication field. Furthermore, Nr is a positive integer greater than 1. The first PRACH transmission sent by the first node can improve the PRACH transmission performance gain and increase the coverage range while reducing the random access delay and improving the utilization efficiency of random access resources.

[0094] The embodiments of the present application can be applied to a retransmission scenario in which a random access channel (RACH) attempt is performed to perform a PRACH transmission with multiple preamble repetitions. In multiple RACH retransmission attempts, the scenario can use repeated transmissions of multiple preamble repetitions to achieve PRACH coverage enhancement.

[0095] In some embodiments, the PRACH transmission with multiple preamble repetitions mentioned in the embodiments of the present application may refer to complex PRACH transmission using the same beam, so as to obtain a signal-to-noise ratio gain by performing repeated transmission of 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 multi-PRACH transmission using different beams, so as to obtain a diversity gain by performing repeated transmission of multiple PRACHs on different beams.

[0096] It should be noted that the beam mentioned in the embodiment of the present application may include or be replaced by at least one of the following: a physical beam, a logical beam, a spatial filter, a spatial parameter, a spatial domain filter, a spatial domain transmission filter, a spatial domain reception filter, and an antenna port.

[0097] The embodiments of the present application can be applied to the initial access process or the beam failure recovery process. Taking the initial access process as an example, the embodiments of the present application can be applied to a four-step random access process (i.e., random access process type-1) or a two-step random access process (i.e., random access process type-2), and the embodiments of the present application are not limited to this.

[0098] The following is a detailed description of the method embodiment of the present application in conjunction with the accompanying drawings. Figure 5 is a flow chart of a method in a first node for wireless communication provided by an embodiment of the present application. As shown in Figure 5, the method can be used for interaction between a first node and a second node.

[0099] As an embodiment, the first node may be a network-controlled repeater (NCR).

[0100] As an embodiment, the first node may be a user equipment, for example, the user equipment 120 shown in FIG1 .

[0101] As an embodiment, the first node may be a relay, such as a relay terminal.

[0102] As an embodiment, the second node may be a network device, for example, the network device 110 shown in FIG1 .

[0103] The method shown in FIG5 includes step S510 , which is described below.

[0104] In step S510, the first node sends a first PRACH transmission to the second node. As mentioned above, the first PRACH transmission is a first physical random access channel transmission.

[0105] The first node may send the first PRACH transmission in a random access procedure (also referred to as a random access process) or in beam management, which is not limited here.

[0106] Exemplarily, the random access procedure may be one or more RACH attempts performed by the first node based on the first PRACH transmission.

[0107] The first PRACH transmission includes Nr preamble repetitions, where Nr is a positive integer greater than 1. Therefore, the first PRACH transmission is a PRACH transmission with multiple preamble repetitions, which may also be called a multiple PRACH transmission.

[0108] As an embodiment, the first PRACH transmission is configured with Nr preamble repetitions.

[0109] As an embodiment, the Nr is configured at a higher layer.

[0110] As an embodiment, the Nr is determined by the first node itself. As an example, the first node can determine the Nr value based on the priority of the service. When the priority of the service is high, Nr can be 4 or 8.

[0111] As an embodiment, the Nr is the number of preamble repetitions included in the first PRACH transmission.

[0112] As an embodiment, Nr may be one of 2, 4 and 8.

[0113] As an embodiment, any two preamble repetitions among the Nr preamble repetitions may be the same or different.

[0114] In some embodiments, any 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, and a preamble format.

[0115] 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 by the first node sending Nr preamble repetitions, or performing the sending of Nr preamble repetitions.

[0116] As an example, one or more of the Nr preamble repetitions may be discarded.

[0117] 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 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 of the multiple preamble repetitions uses a preamble format including multiple sequences, while preamble repetition 2 uses a preamble format including a single sequence.

[0118] As an embodiment, the Nr preamble repetitions correspond to one preamble format.

[0119] As an embodiment, any preamble repetition among the Nr preamble repetitions includes a preamble format.

[0120] As an embodiment, any one of the Nr preamble repetitions is a preamble format.

[0121] As an embodiment, any two preamble repetitions among the Nr preamble repetitions use the same preamble format.

[0122] It should be noted that the preamble format corresponding to any preamble repetition in the Nr preamble repetitions may be any existing preamble format or any future preamble format, which is not limited here.

[0123] For ease of understanding, the following exemplary description of the preamble formats that may correspond to Nr preamble repetitions is provided in conjunction with several preamble formats in FIG6 . FIG6 shows only some of the preamble formats for comparative illustration. It should be understood that the preamble formats in FIG6 are merely examples and do not limit the various preamble formats that may correspond to Nr preamble repetitions.

[0124] The preamble formats shown in Figure 6 include formats 0 to 3, as well as formats C0 and C1. As shown in Figure 6, there are multiple other preamble formats between formats 3 and C0. Referring to Figure 6, the preamble format primarily consists of a cyclic prefix (CP) at the front, a preamble sequence (SEQ) in the middle, and a guard interval (GP) at the end. All preamble formats include a CP and n SEQs, though some preamble formats may not include a GP.

[0125] As shown in FIG6 , the number n of SEQs can be 1, such as format 0 and format C0 in FIG6 . The number n of SEQs can also be another integer greater than 1. For example, the value n of format 1 in FIG6 is 2, and the value n of formats 2, 3, and C1 is 4.

[0126] Continuing with Figure 6, different preamble formats have different durations. For example, Format 0 and Format 3 have a duration of 1ms, Format 1 has a duration of 3ms, Format 2 has a duration greater than 4ms, and Format C0 and Format C1 have a duration less than 1ms. Because the total duration of different preamble formats varies, and the value of n varies, the durations of the CP, SEQ, and GP in each format also vary.

[0127] 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. As mentioned above, RO represents RACH occasion or PRACH occasion, and the first RO set is the first PRACH occasion set.

[0128] In the embodiment of the present application, the RO set may include or be replaced by at least one of the following: ROSet, random access channel occasion group (ROG), PRACH occasion group and PRACH transmission occasion set.

[0129] As an embodiment, the first RO set may be replaced by the first ROSet.

[0130] As an embodiment, the first RO set may be replaced by the first PRACH opportunity group.

[0131] As an embodiment, the first RO set may be replaced by a first PRACH transmission opportunity set.

[0132] The first RO set may include Nr ROs. Nr is as described above and will not be repeated here. As an embodiment, Nr is the number of ROs in the first RO set.

[0133] In the embodiment of the present application, RO may include or be replaced by at least one of the following: RACH occasion, PRACH occasion, and physical random access channel transmission occasion (PRACH transmission occasion).

[0134] As an embodiment, the Nr ROs may be replaced by Nr PRACH opportunities.

[0135] As an embodiment, the Nr ROs may be replaced by Nr PRACH transmission opportunities.

[0136] As an embodiment, the Nr ROs included in the first RO set are continuous in the time domain.

[0137] As an embodiment, the Nr ROs included in the first RO set use the same frequency domain resources.

[0138] As an embodiment, the Nr ROs included in the first RO set are all valid. RO validity means that the time-frequency resources corresponding to the RO can be used for PRACH transmission.

[0139] The time domain resources corresponding to the first RO set are used to send the first PRACH transmission. In some embodiments, the first node can send Nr preamble repetitions in the first preamble repetition via Nr ROs in the first RO set. In other words, the Nr preamble repetitions can be carried on Nr ROs respectively.

[0140] The first RO set may be one of a plurality of RO sets. Each of the plurality of RO sets includes Nr ROs. That is, each RO set includes the same number of ROs, so as to determine the first RO set for sending the first PRACH transmission.

[0141] Multiple RO sets correspond to the same frequency domain resource index. In some embodiments, the frequency domain resource index can be set according to different frequency units or different frequency bandwidths, which is not limited here.

[0142] As an embodiment, the multiple RO sets corresponding to the same frequency domain resource index means that the frequency domain resources occupied by all RO sets in the multiple RO sets correspond to the same frequency domain resource index.

[0143] As an embodiment, the multiple RO sets corresponding to the same frequency domain resource index means that the multiple RO sets may be part of or all of the RO sets corresponding to the same frequency domain resource index in the first period.

[0144] As an embodiment, the multiple RO sets corresponding 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.

[0145] As an embodiment, the multiple RO sets corresponding to the same frequency domain resource index includes that the indexes of the frequency domain resources occupied by Nr ROs included in any RO set in the multiple RO sets are the same.

[0146] As an embodiment, the frequency domain resources occupied by any RO in any RO set among the multiple RO sets may be part or all of the frequency domain resources indicated by the same frequency domain resource index.

[0147] The first time offset is the time offset between any two adjacent RO sets in the plurality of RO sets. In other words, the time offset between any two adjacent RO sets in the plurality of RO sets is the same, ie, the first time offset.

[0148] As an embodiment, in the multiple RO sets, the first time offset may indicate a time offset between the first RO set and a previous RO set or a next RO set.

[0149] As an embodiment, the first time offset is used to indicate the time offset between any adjacent RO at the first position in the first RO set and the RO at the first position in the second RO set among 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. For another example, 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.

[0150] The first time offset includes a positive integer number of ROs. The offset of the first time offset can be represented by the positive integer number of ROs.

[0151] As an embodiment, 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.

[0152] As an embodiment, the positive integer number of ROs included in the first time offset is continuous in time.

[0153] As an embodiment, the positive integer number of ROs included in the first time offset are all valid.

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

[0155] As an embodiment, the positive integer ROs included in the first time offset correspond to the same frequency domain resource index.

[0156] As an embodiment, the frequency domain resource indexes corresponding to the positive integer number of ROs included in the first time offset are the same as the frequency domain resource indexes corresponding to the multiple RO sets.

[0157] As an embodiment, within a certain frequency bandwidth, the time offsets of multiple RO sets corresponding to different frequency domain resource indexes may be the same or different, which is not limited here.

[0158] As an embodiment, 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.

[0159] As an embodiment, the first time offset is configured by a higher layer.

[0160] As an embodiment, the first time offset is indicated by an RRC IE.

[0161] As an embodiment, the first time offset includes TimeOffsetBetweenStartingRO.

[0162] As an embodiment, the definition of TimeOffsetBetweenStartingRO refers to 3GPP TS38.331.

[0163] In some embodiments, after the time domain position of the starting RO set among the multiple RO sets is determined, the time domain position of any RO set among the multiple RO sets other than the starting RO set can be determined based on the first time offset. For example, any RO set among the multiple RO sets can be referred to as a candidate RO set. The multiple candidate RO sets include the first RO set.

[0164] As an embodiment, the first candidate RO set and the second candidate RO set are any two adjacent RO sets among the multiple RO sets, the first time offset includes M ROs, and M is a positive integer; the starting RO of the second candidate RO set is M ROs after the starting RO of the first candidate RO set.

[0165] As a sub-embodiment of the above embodiment, the M ROs are valid ROs that are continuous in time.

[0166] 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.

[0167] As an embodiment, the value of M is any positive integer greater than the value of Nr.

[0168] As an embodiment, when the value of M is equal to or less than the value of Nr, it may indicate that the first time offset is not configured.

[0169] For ease of understanding, assuming Nr is 2, the first time offset is illustrated in conjunction with Figure 7. Figure 7 shows 12 consecutive ROs in the time domain, RO#1 to RO#12. As shown in Figure 7, when the number of ROs in each candidate RO set is the same (all 2), the first time offset can be represented by the number of ROs, M.

[0170] 7 , the first time offset is determined by the time offset between the starting ROs in two adjacent candidate RO sets. When M=4, the first time offset 710 includes 4 ROs. When M=8, the first time offset 720 includes 8 ROs.

[0171] As shown in Figure 7, after the first time offset is configured, the index of the starting RO of each candidate RO set other than the first candidate RO set becomes relatively larger. When M = 4, the index of the starting RO of the second candidate RO set is 5, the index of the starting RO of the third candidate RO set is 9, and so on. When M = 8, the index of the starting RO of the second candidate RO set is 9, the index of the starting RO of the third candidate RO set should be 17 (not shown in Figure 7), and so on.

[0172] Whether the first time offset is configured to be used to determine the starting RO in the first RO set can solve the problem of limited PRACH mask index indication domain caused by configuring time offsets between RO sets, and can indicate the first RO set more flexibly. Taking Figure 7 as an example, after configuring the first time offset, the index of the starting RO in the RO set will be relatively large. If indicated only 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 not 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.

[0173] In some embodiments, the first RO set may be determined by determining a starting RO in the first RO set. Therefore, determining the starting RO in the first RO set may be replaced by determining the first RO set.

[0174] As an embodiment, the starting RO in the first RO set can be used to determine the first RO set for sending the first PRACH transmission. Exemplarily, when the Nr ROs in the first RO set are continuous in the time domain and use the same frequency domain resources, one or more ROs in the first RO set located after the starting RO can be determined based on the starting RO, thereby determining the first RO set.

[0175] Optionally, the starting RO in the first RO set is the first RO among Nr ROs included in the first RO set.

[0176] Optionally, the starting RO in the first RO set is the earliest RO in the time domain among the Nr ROs included in the first RO set.

[0177] As an embodiment, when the first time offset is configured, the first time offset is used to determine a starting RO in the first RO set.

[0178] As an embodiment, when the first time offset is configured, the first time offset is used together with other parameters to determine the starting RO in the first RO set. The other parameters may include Nr and at least one of the first PRACH mask index, the number of multiple SSB indexes, the first SSB index, and the first mapping order described below. This will be described in detail below in conjunction with embodiments.

[0179] 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.

[0180] 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.

[0181] The first node may trigger the first PRACH transmission based on various methods. That is, the first node may send the first PRACH transmission based on various information. For example, the first node may trigger the first PRACH transmission based on first signaling sent by the second node. For another example, the first node may trigger the first PRACH transmission based on higher-layer signaling.

[0182] In some embodiments, the first PRACH transmission is triggered by a first signaling. In other words, the first node sends the first PRACH transmission after receiving the first signaling. The first node may receive the first signaling in a variety of ways.

[0183] In some embodiments, the first signaling may be sent by the second node to the first node. For example, the second node may send the first signaling to the first node via DCI. In some embodiments, the first node may determine the first signaling via higher layer signaling. For example, the first node may receive the first signaling via radio resource control (RRC) signaling.

[0184] As an embodiment, the first signaling is DCI.

[0185] As an embodiment, the first signaling is a PDCCH order.

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

[0187] As an embodiment, the first signaling is ra-ssb-OccasionMaskIndex.

[0188] As an embodiment, the definition of ra-ssb-OccasionMaskIndex refers to 3GPP TS38.331.

[0189] As an embodiment, the first signaling includes at least one of DCI and RRC IE.

[0190] The first signaling may include a first PRACH mask index. As mentioned above, PRACH stands for Physical Random Access Channel, and the first PRACH mask index is a first physical random access channel mask index.

[0191] The value corresponding to the first PRACH mask index can be any index value in Table 1 above, any index value after the expansion of Table 1, or any index value in the newly created PRACH mask index table, which is not limited here.

[0192] As an embodiment, the value of the first PRACH mask index is one of 0 to 15.

[0193] As an embodiment, the value of the first PRACH mask index is one of 0 to 10.

[0194] In some embodiments, a first PRACH mask index is used to indicate an RO associated with a first SSB. This RO may serve as a starting RO in a first set of ROs for transmitting a first PRACH transmission.

[0195] As an embodiment, the first PRACH transmission is triggered by a first signaling, and the first signaling is a PDCCH order.

[0196] 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 may send the first PRACH transmission according to the value of the random access preamble index field in the PDCCH order.

[0197] As an embodiment, the first PRACH transmission is triggered by a higher layer.

[0198] As an embodiment, the first PRACH transmission is triggered by a higher layer, and the first signaling is RRC IE.

[0199] In some embodiments, the first node may transmit a first PRACH transmission after receiving a first SSB. For example, the first node may receive a first SSB transmitted by a second node. The first SSB may be one of a first SSB set transmitted by the second node. In other words, the first SSB is one of a plurality of SSBs included in the first SSB set.

[0200] As an embodiment, the number of SSBs in the first SSB set is indicated by higher layer signaling.

[0201] As an embodiment, the number of SSBs in the first SSB set is indicated by an RRC IE.

[0202] As an embodiment, the number of SSBs in the first SSB set is indicated by ssb-PositionsInBurst in SIB1 or ServingCellConfigCommon.

[0203] As an embodiment, the number of SSBs in the first SSB set is equal to the value of ssb-PositionsInBurst in SIB1 or ServingCellConfigCommon.

[0204] As an embodiment, the definition of SIB1 refers to 3GPP TS38.331.

[0205] As an embodiment, the definition of ServingCellConfigCommon refers to 3GPP TS38.331.

[0206] As an embodiment, the first SSB is associated with the first RO set and / or the first PRACH transmission.

[0207] As an embodiment, the first SSB set includes the first SSB.

[0208] As an embodiment, the first SSB is selected from the multiple SSBs.

[0209] As an embodiment, the first PRACH transmission is triggered by a higher layer, and the first SSB is selected from the multiple SSBs.

[0210] As an embodiment, 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.

[0211] In some embodiments, the first node may determine the first SSB by measuring multiple SSBs in the first SSB set. Exemplarily, the measurement value for the first SSB is a maximum value among multiple measurement values ​​for the multiple SSBs included in the first SSB set.

[0212] In some embodiments, the measurement value may be indicated by any parameter indicating signal quality, for example, reference signal received power (RSRP), reference signal received quality (RSRQ), or other parameters.

[0213] As an embodiment, the measurement value for the first SSB includes an RSRP value.

[0214] As an embodiment, the multiple measurement values ​​of the multiple SSBs included in the first SSB set are respectively multiple RSRP values.

[0215] 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.

[0216] As a sub-embodiment of the above embodiment, the measured value for the first SSB is any maximum value among the multiple maximum values.

[0217] As a sub-embodiment of the above embodiment, the measured value for the first SSB is the first maximum value among the multiple maximum values.

[0218] 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. 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, namely SSB0 to SSB3.

[0219] As an embodiment, multiple SSBs in the first SSB set correspond one-to-one to multiple SSB indexes.

[0220] As an embodiment, the number of SSBs in the first SSB set is equal to the number of the multiple SSB indexes.

[0221] As an embodiment, the multiple SSB indexes are respectively indexes of the multiple SSBs included in the first SSB set.

[0222] As an embodiment, any SSB index among the multiple SSB indexes is the index of an SSB among the multiple SSBs corresponding to the any SSB index.

[0223] As an embodiment, the first SSB index is one of the multiple SSB indexes.

[0224] As an embodiment, the first SSB index is the index of the first SSB among the multiple SSBs included in the first SSB set.

[0225] As an embodiment, the Nr ROs in the first RO set are associated with the first SSB index.

[0226] The first SSB index may be carried in a variety of information. For example, the index of the first SSB may be indicated by the first signaling.

[0227] As an embodiment, the first signaling includes an index of the first SSB.

[0228] As an embodiment, the first PRACH transmission is triggered by a first signaling, and the first signaling includes the index of the first SSB.

[0229] As an embodiment, 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.

[0230] As an embodiment, 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.

[0231] The above, in conjunction with Figures 5 to 7, describes a scheme in which, when a first node sends a first PRACH transmission on a first RO set, the first RO set is determined based on whether a first time offset is configured. This allows for more flexible indication of the first RO set. Furthermore, when a first time offset is configured, the first RO set can be determined based on the configured time offset. The following describes a specific implementation of determining the first RO set or its starting RO based on whether the first time offset is configured and the configured time offset.

[0232] 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 related only to other parameters. The other parameters include at least one of the number of multiple SSB indexes, the first SSB index, and Nr.

[0233] 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, 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.

[0234] 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.

[0235] In some embodiments, the first period includes multiple candidate ROs. Any RO in the multiple RO sets belongs to the multiple candidate ROs in the first period. Therefore, the multiple candidate ROs include any RO in the multiple RO sets.

[0236] 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 multiple candidate ROs.

[0237] As an embodiment, the index of the starting RO in the first RO set is an index of the starting RO in the first RO set among multiple candidate ROs within the first period.

[0238] As an embodiment, multiple candidate ROs correspond to multiple RO indexes, and a starting index among the multiple candidate RO indexes is also related to the index of the starting RO in the first RO set.

[0239] 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 indexes, the first SSB index and the 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 indexes, the first SSB index and the Nr.

[0240] As an embodiment, when the first time offset is configured, the index of the starting RO in the first RO set is determined based on the number of ROs included in the first time offset, the number of the multiple SSB indexes, the first SSB index and the Nr; when the first time offset is not configured, the index of the starting RO in the first RO set is determined based on the number of the multiple SSB indexes, the first SSB index and the Nr.

[0241] In some embodiments, the first period may be used to determine multiple ROs associated with an SSB in the first SSB set. The first period may be the time period X described above, or other time periods for indicating multiple ROs, which is not limited herein.

[0242] As an embodiment, the first cycle starts from wireless frame 0 (frame 0).

[0243] As an embodiment, the first period includes at least one association pattern period.

[0244] As an embodiment, the first period includes at least one association mode period of SSB index to RO.

[0245] As an embodiment, the association mode period is an association mode period from SSB index to RO.

[0246] As an embodiment, the association mode period is an SSB to RO association mode period.

[0247] As an embodiment, the association mode period includes at least one association period.

[0248] As an embodiment, the association mode period includes at least one association period of an SSB index to a RO.

[0249] As an embodiment, the association period is an association period from SSB index to RO.

[0250] As an embodiment, the association period is an association period from SSB to RO.

[0251] As an embodiment, the first period includes at least one association period of an SSB index to a RO.

[0252] As an embodiment, the first period includes at least one associated period.

[0253] As an embodiment, the association cycle includes at least one mapping cycle.

[0254] As an embodiment, the association period includes at least one SSB index to RO mapping period.

[0255] As an embodiment, the first period includes at least one SSB index to RO mapping period.

[0256] As an embodiment, the first period includes at least one mapping period.

[0257] In some embodiments, the first period includes a plurality of candidate RO sets. Whether the first time offset is configured is used to determine an index of the first RO set among the plurality of candidate RO sets.

[0258] In some embodiments, the first RO set is selected from a plurality of candidate RO sets. The plurality of candidate RO sets may be a plurality of RO sets pre-configured in the first period to avoid conflict with PRACH transmission under the CBRA mechanism.

[0259] As an embodiment, within time period X, multiple candidate RO sets for PRACH transmission with multiple preamble repetitions can be preconfigured before the PRACH mask index is indicated. That is, the first RO set is determined using the option 1 described above. For another example, to avoid conflicts between multiple preamble repetition PRACH transmission under the CFRA mechanism and multiple preamble repetition PRACH transmission under the CBRA mechanism, multiple RO sets for multiple preamble repetition PRACH transmission within time period X need to be preconfigured before the PRACH mask index is indicated. In other words, the option 1 is used to indicate the RO set or the starting RO in the RO set.

[0260] As an embodiment, any RO set among the multiple RO sets is one of the multiple candidate RO sets.

[0261] As an embodiment, the multiple candidate RO sets are multiple RO sets related to the first SSB and / or the first PRACH transmission.

[0262] As an embodiment, the multiple candidate RO sets correspond to the indexes of the multiple candidate RO sets. The index of the first RO set in the multiple candidate RO sets may indicate the position of the first RO set in the multiple candidate RO sets.

[0263] In some embodiments, when the first time offset is configured, the index of the first RO set in 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 the Nr; when the first time offset is not configured, the index of the first RO set in the multiple alternative RO sets is related to the number of the multiple SSB indexes, the first SSB index and the Nr.

[0264] As an embodiment, when the first time offset is configured, the index of the first RO set in the multiple alternative RO sets is determined based on the number of ROs included in the first time offset, the number of the multiple SSB indexes, the first SSB index and the Nr; when the first time offset is not configured, the index of the first RO set in the multiple alternative RO sets is determined based on the number of the multiple SSB indexes, the first SSB index and the Nr.

[0265] As can be seen from the foregoing, the first node can trigger a first PRACH transmission after receiving the first signaling, wherein the first signaling includes a 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.

[0266] 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.

[0267] 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.

[0268] 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 only related 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.

[0269] 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.

[0270] 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.

[0271] In one 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 only related 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.

[0272] As an embodiment, when the first time offset is configured, the index of the first RO set in 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 in the multiple alternative RO sets is related to the first PRACH mask index.

[0273] As an embodiment, when the first time offset is configured, the index of the first RO set in 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 in the multiple alternative RO sets is determined according to the first PRACH mask index.

[0274] In one embodiment, when the first time offset is configured, the index of the first RO set in the multiple candidate 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 in the multiple candidate RO sets is only related 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.

[0275] The foregoing describes an embodiment of a method for determining the starting RO in a first RO set based on whether a first time offset is configured. This method can address the issue of a limited PRACH mask index indication field due to the first time offset. For ease of understanding, the following example illustrates the method for determining the starting RO in the first RO set based on whether the first time offset is configured, using the example of determining the starting RO in the first RO set based on the first time offset and the first PRACH mask index, in conjunction with Figures 8 and 9.

[0276] The mapping relationships in Figures 8 and 9 are the same as those in Figure 2 and are not further described here. Figure 8 shows an example where the first time offset is not configured, Figure 9 shows an example where the number of ROs included in the first time offset is 4, and Figure 10 shows an example where the number of ROs included in the first time offset is 8. The number of SSBs (the number of multiple SSB indexes) is 2, and the RO set size is 2, meaning that Nr is 2.

[0277] Referring to Figure 8 , the first time offset is not configured, and multiple candidate RO sets corresponding to SSB0 are preconfigured and filled with shading. When the first PRACH mask index is 3, the starting RO of the first RO set can be determined to be RO#9 based on the number of multiple SSB indices, the first SSB index, and the first PRACH mask index.

[0278] Referring to Figure 9 , the offset of the first time offset is configured as 4, which means that the number of ROs included in the first time offset is 4. The shaded RO sets in Figure 8 are multiple candidate RO sets corresponding to SSB0 determined based on 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 to be RO#17 based on the number of ROs included in the first time offset, the number of multiple SSB indices, the first SSB index, and the first PRACH mask index.

[0279] Referring to Figure 10 , the offset of the first time offset is configured as 8, meaning that the number of ROs included in the first time offset is 8. The shaded RO sets in Figure 8 are multiple candidate RO sets corresponding to SSB0, determined based on 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 to be RO#33 based on the number of ROs included in the first time offset, the number of multiple SSB indices, the first SSB index, and the first PRACH mask index.

[0280] As can be seen from Figures 8 to 10, when determining the starting RO in the first RO set based on 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 can be indicated by this method is not limited by the first PRACH mask index indication field.

[0281] The above description, in conjunction with Figures 4 to 10, describes a method embodiment for determining whether the first RO set or the starting RO of the first RO set is configured based on the first time offset. This method helps address the issue of a limited PRACH mask index indication field. This method also maintains the advantage of Option 1 in avoiding conflicts with other PRACH transmissions and allows the PRACH mask index to more flexibly indicate the RO set.

[0282] However, not all preambles in an RO are associated with a single SSB. In other words, a RO may be associated with multiple SSBs. When a RO has 64 preambles, after the SSBs are mapped to the ROs according to the SSB-to-RO mapping relationship, any two adjacent RO sets may not be able to be deduced from each other using the above formula or other methods. For example, the difference between the starting RO of the subsequent RO set and the starting RO of the previous RO set may not be an integer multiple of the number of SSBs and / or Nr.

[0283] To solve this problem, an embodiment of the present application further proposes a method for determining a starting RO of a first RO set. In this method, the first RO set may also be related to the first mapping order, thereby maximizing the range of the RO set that can be indicated.

[0284] 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 to map multiple SSB indexes to multiple candidate ROs within a first period. The first mapping order can be an existing SSB-RO mapping relationship or an extended SSB-RO mapping relationship, which is not limited here.

[0285] As an embodiment, the first mapping order may be associated with one or more of the following information: an index of a preamble in the first RO set, frequency domain resources of multiple candidate RO sets, and time domain resources of multiple candidate RO sets.

[0286] As an embodiment, the first mapping order may include: according to the change order of the leading index in one of the multiple candidate RO sets, such as the order of increasing leading index or the order of decreasing leading index, etc. In other words, the multiple SSB indexes may be arranged according to the change order of the leading index in one of the multiple candidate RO sets.

[0287] As an embodiment, the first mapping order may include: according to the change order of the frequency domain resources of the multiple candidate RO sets, such as the order of increasing frequency domain resources or the order of decreasing frequency domain resources. In other words, the multiple SSB indexes can arrange the multiple candidate RO sets for frequency division multiplexing according to the change order of the frequency domain resources.

[0288] As an embodiment, the first mapping order may include: according to the change order of the time domain resources of the multiple candidate RO sets, such as the order of increasing time domain resources or the order of decreasing time domain resources. In other words, the multiple SSB indexes can arrange the multiple candidate RO sets for time division multiplexing according to the change order of the time domain resources.

[0289] As an embodiment, the first mapping order may include one or more of the following orders: an order of increasing leading index within an RO set among multiple alternative RO sets; an order of increasing frequency domain resources among multiple alternative RO sets; and an order of increasing time domain resources among multiple alternative RO sets.

[0290] As an embodiment, the first mapping order may include: first, in ascending order of the leading index within one of the multiple candidate RO sets; second, in ascending order of the frequency domain resources of the multiple candidate RO sets; and third, in ascending order of the time domain resources of the multiple candidate RO sets. It should be understood that the first mapping order may also include a random permutation or combination of the above-mentioned orders, which is not limited here.

[0291] As an embodiment, 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 multiple SSB indexes, the first SSB index, Nr and the first PRACH mask index.

[0292] As an embodiment, the first RO set may be related to whether the first time offset is configured and other parameters. The other parameters include part or all of the parameters in the first mapping order, the number of SSBs, the first SSB index, Nr, and the first PRACH mask index.

[0293] As an embodiment, 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 multiple SSB indexes to the multiple ROs.

[0294] As an embodiment, 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 multiple SSB indices to the multiple candidate ROs, Nr and the first PRACH mask index.

[0295] In some embodiments, the first node may first map multiple SSB indexes to multiple candidate ROs according to a first mapping order. The multiple candidate ROs include Nr ROs in the first RO set. Exemplarily, the multiple candidate ROs may be some or all of the ROs in the first cycle.

[0296] As an embodiment, at least two candidate ROs among the plurality of candidate ROs are frequency division multiplexing (FDM), for example, RO#1 and RO#2 in FIG8 are frequency division multiplexing.

[0297] As an embodiment, at least two candidate ROs among the plurality of candidate ROs are FDMed.

[0298] As an embodiment, at least two candidate ROs among the multiple candidate ROs are frequency multiplexed PRACH occasions.

[0299] As an embodiment, the multiple candidate ROs are all time division multiplexed (TDM).

[0300] As an embodiment, the multiple candidate ROs being time division multiplexed may also be expressed as the multiple candidate ROs being TDMed.

[0301] As an embodiment, the multiple candidate ROs are time multiplexed PRACH occasions.

[0302] As an embodiment, at least two candidate ROs among the plurality of candidate ROs are TDM.

[0303] As an embodiment, at least Nr ROs among the plurality of candidate ROs are TDM.

[0304] As an embodiment, the multiple candidate ROs are within at least one PRACH time slot.

[0305] As an embodiment, the multiple candidate ROs are within one PRACH time slot.

[0306] As an embodiment, the multiple candidate ROs are within multiple PRACH time slots.

[0307] The above describes various methods for indicating the first RO set based on whether the first time offset is configured and multiple other parameters. Among the multiple other parameters, the first PRACH mask index can be indicated via first signaling. SSB-related parameters are determined by receiving and detecting the first SSB set. The first node also needs to determine the Nr and the first mapping order. The following describes how the first node determines these parameters.

[0308] In some embodiments, the first node may determine the parameter indicating the first RO set by receiving the first information. For example, the first node may receive the first information sent by the second node.

[0309] As an embodiment, the first information may include some parameters for indicating the first RO set.

[0310] As an embodiment, the first information may be used to determine some parameters indicating the first RO set.

[0311] As an embodiment, the mapping relationship between SSB and RO includes the number of SSB indexes associated with one RO and the number of leading elements corresponding to each SSB index of each RO. In other words, the first information can be used to determine the first mapping order.

[0312] As an embodiment, the first information and the first mapping order are used to determine that the multiple SSB indexes are mapped to the multiple candidate ROs within the first period.

[0313] As an embodiment, 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.

[0314] As an embodiment, 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 to the multiple ROs.

[0315] In some embodiments, the first information may be used to indicate the number of SSB indices associated with a 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.

[0316] As an embodiment, the first information indicates that N SSB indexes are associated with one RO, N is less than 1, or N is not less than 1.

[0317] As an embodiment, the first information indicates that R preambles are associated with each SSB index of each RO, where R is a positive integer. Exemplarily, when each RO is associated with multiple SSB indexes, each SSB index is associated with R preambles on the RO.

[0318] As an embodiment, R is a positive integer not greater than 64. Generally, there are 64 preambles on an RO, and therefore, R is not greater than 64.

[0319] As an embodiment, the first information indicates that an SSB index is associated with R preambles on an RO.

[0320] As an embodiment, the first information indicates that an SSB index is mapped to R preambles on an RO.

[0321] As an embodiment, 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.

[0322] As an embodiment, the R preambles are R contention based preambles.

[0323] Optionally, the indices of the R preambles are consecutive. Optionally, the R preambles have consecutive indices.

[0324] In some embodiments, the first information includes ssb-perRACH-Occasion or ssb-perRACH-OccasionAndCB-PreamblesPerSSB or msgA-SSB-PerRACH-OccasionAndCB-PreamblesPerSSB in 3GPP TS 38.331.

[0325] As an embodiment, the first information includes RRC IE.

[0326] As an embodiment, the first information is ssb-perRACH-OccasionAndCB-PreamblesPerSSB.

[0327] As an embodiment, the definition of ssb-perRACH-OccasionAndCB-PreamblesPerSSB refers to 3GPP TS38.331.

[0328] In some embodiments, the first information is further used to indicate frequency division multiplexing related parameters, such as the number of ROs for frequency division multiplexing. The frequency division multiplexing related parameters can also be used as one of the other parameters, which will not be described in detail here.

[0329] As an embodiment, the first information indicates the number of ROs frequency-division multiplexed in a time period.

[0330] As an embodiment, the first information indicates the number of frequency division multiplexed ROs among the multiple ROs.

[0331] As an embodiment, the first information includes msg1-FDM.

[0332] As an embodiment, the definition of msg1-FDM refers to 3GPP TS38.331.

[0333] In some embodiments, the first node may determine Nr by receiving the second information. For example, the first node receives the first information sent by the second node. The first information may include Nr.

[0334] As an embodiment, the second information is configured by a higher layer.As an embodiment, the second information includes RRC IE.

[0335] 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.

[0336] The following describes an embodiment of the present application in more detail with reference to the specific example Figure 11. It should be noted that the examples of Figures 5 to 10 are merely to help those skilled in the art understand the embodiments of the present application, rather than to limit the embodiments of the present application to the specific numerical values ​​or specific scenarios illustrated. Those skilled in the art can obviously make various equivalent modifications or changes based on the examples of Figures 5 to 10 given, and such modifications or changes also fall within the scope of the embodiments of the present application. Figure 11 is explained from the perspective of the interaction between the first node and the second node.

[0337] 7 , in step S1110 , the first node receives first information sent by the second node.

[0338] In step S1120, the first node determines a first mapping order. For example, the first node may determine an SSB-to-RO mapping relationship within a time period X through the first information.

[0339] In step S1130, the first node receives second information sent by the second node. The second information may indicate a value of Nr.

[0340] In step S1140, the first node determines multiple candidate RO sets within a first period. For example, the first node may determine multiple candidate RO sets within a time period X based on received SSB parameters, SSB-to-RO mapping relationship, and Nr.

[0341] In step S1150, the first node receives first signaling sent by the second node. The first signaling includes a first PRACH mask index.

[0342] In step S1160, the second node determines the starting RO in the first RO set and the first RO set based on whether the first time offset is configured. For example, the first node determines the starting RO in the first RO set based on whether the first time offset is configured and the configured value of the first time offset. The configuration of the first time offset can be used together with the number of SSBs, the first SSB index, and the first PRACH mask index to determine the starting RO. Furthermore, the first node determines one or more RO(s) after the starting RO in the first RO set based on the SSB-to-RO mapping relationship, thereby determining the first RO set.

[0343] At 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.

[0344] In step S1180, the first node monitors a random access response (RAR) within a RAR time window. The first node may perform a subsequent random access procedure after receiving the RAR corresponding to the first PRACH transmission.

[0345] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 11. The device embodiment of the present application is described in detail below in conjunction with Figures 12 to 15. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0346] FIG12 is a diagram of a first node for wireless communication provided by an embodiment of the present application. As shown in FIG12 , the first node 1200 includes a first transceiver 1210 .

[0347] The first transceiver 1210 can be used 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 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, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured to be used to determine the starting RO in the first RO set.

[0348] As an embodiment, the first period includes multiple alternative ROs, any RO in the multiple RO sets belongs to the multiple alternative ROs in 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 in the multiple alternative ROs in the first period; whether the first time offset is configured to be used to determine the index of the starting RO in the first RO set.

[0349] 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 indexes, the first SSB index and the 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 indexes, the first SSB index and the Nr.

[0350] As an embodiment, the first cycle includes multiple candidate RO sets, and any RO set in the multiple candidate RO sets is one of the multiple candidate RO sets; whether the first time offset is configured is used to determine the index of the first RO set in the multiple candidate RO sets.

[0351] As an embodiment, when the first time offset is configured, the index of the first RO set in 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 the Nr; when the first time offset is not configured, the index of the first RO set in the multiple alternative RO sets is related to the number of the multiple SSB indexes, the first SSB index and the Nr.

[0352] As an embodiment, the first transceiver 1210 is also used to receive first signaling, wherein 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.

[0353] As an embodiment, the first transceiver 1210 is also used to receive 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 the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

[0354] As an embodiment, the first transceiver 1210 is also used to receive first information, wherein the first information is used to indicate the number of SSB indexes associated with an 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 the first period.

[0355] As an embodiment, the first transceiver 1210 is further configured to receive second information, wherein the second information includes the Nr, and the Nr is one of 2, 4, and 8.

[0356] As an embodiment, 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 shown in FIG14 .

[0357] FIG13 is a diagram of a second node for wireless communication provided by an embodiment of the present application. As shown in FIG13 , the second node 1300 includes a second transceiver 1310 .

[0358] The second transceiver 1310 can be used 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 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, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured to be used to determine the starting RO in the first RO set.

[0359] As an embodiment, the first period includes multiple alternative ROs, any RO in the multiple RO sets belongs to the multiple alternative ROs in 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 in the multiple alternative ROs in the first period; whether the first time offset is configured to be used to determine the index of the starting RO in the first RO set.

[0360] 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 indexes, the first SSB index and the 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 indexes, the first SSB index and the Nr.

[0361] As an embodiment, the first cycle includes multiple candidate RO sets, and any RO set in the multiple candidate RO sets is one of the multiple candidate RO sets; whether the first time offset is configured is used to determine the index of the first RO set in the multiple candidate RO sets.

[0362] As an embodiment, when the first time offset is configured, the index of the first RO set in 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 the Nr; when the first time offset is not configured, the index of the first RO set in the multiple alternative RO sets is related to the number of the multiple SSB indexes, the first SSB index and the Nr.

[0363] As an embodiment, the second transceiver 1310 is also used to send a first signaling, wherein 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.

[0364] As an embodiment, the second transceiver 1310 is also used to send 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 the plurality of SSB indexes to be mapped to a plurality of alternative ROs within a first period.

[0365] As an embodiment, the second transceiver 1310 is also used to send first information, wherein the first information is used to indicate the number of SSB indexes associated with an 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 the first period.

[0366] As an embodiment, the second transceiver 1310 is further configured to send second information, wherein the second information includes the Nr, and the Nr is one of 2, 4, and 8.

[0367] As an embodiment, 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 shown in FIG14 .

[0368] Figure 14 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 14 indicate that the unit or module is optional. Apparatus 1400 may be used to implement the method described in the above method embodiment. Apparatus 1400 may be a chip, user equipment, or network equipment.

[0369] The device 1400 may include one or more processors 1410. The processor 1410 may support the device 1400 to implement the method described in the method embodiment above. The processor 1410 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0370] The apparatus 1400 may further include one or more memories 1420. The memories 1420 store programs that can be executed by the processor 1410, causing the processor 1410 to perform the methods described in the above method embodiments. The memories 1420 may be independent of the processor 1410 or integrated into the processor 1410.

[0371] The apparatus 1400 may further include a transceiver 1430. The processor 1410 may communicate with other devices or chips via the transceiver 1430. For example, the processor 1410 may transmit and receive data with other devices or chips via the transceiver 1430.

[0372] Figure 15 is a block diagram of a hardware module of a communication device provided in an embodiment of the present application. Specifically, Figure 15 shows a block diagram of a first communication device 1550 and a second communication device 1510 communicating with each other in an access network.

[0373] 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.

[0374] 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.

[0375] During transmission from the second communications device 1510 to the first communications device 1550, at the second communications device 1510, upper layer data packets from the core network or from a data source 1577 are provided to a controller / processor 1575. The core network and data source 1577 represent all protocol layers above the L2 layer. The controller / processor 1575 implements L2 layer functionality. During transmission from the second communications device 1510 to the first communications 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 communications device 1550 based on various priority metrics. The controller / processor 1575 is also responsible for retransmission of lost packets and signaling to the first communications device 1550. The transmit processor 1516 and the multi-antenna transmit processor 1571 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 1516 implements coding and interleaving to facilitate forward error correction at the second communication device 1510, as well as mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying, quadrature phase shift keying, M-phase shift keying, and M-quadrature amplitude modulation). The multi-antenna transmit processor 1571 performs digital spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming on the coded and modulated symbols to generate one or more spatial streams. The transmit processor 1516 then maps each spatial stream to a subcarrier, multiplexes it with a reference signal (e.g., a pilot) in the time and / or frequency domain, and then uses an inverse fast Fourier transform to generate a physical channel carrying the time-domain multicarrier symbol stream. The multi-antenna transmit processor 1571 then performs transmit analog precoding / beamforming operations on the time-domain multicarrier symbol stream. Each transmitter 1518 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 1571 into a radio frequency stream, and then provides it to a different antenna 1520.

[0376] During transmission from the second communications device 1510 to the first communications device 1550, at the first communications device 1550, each receiver 1554 receives a signal via its corresponding antenna 1552. Each receiver 1554 recovers the information modulated onto the RF carrier and converts the RF stream into a baseband multi-carrier symbol stream, which is provided to the receive processor 1556. The receive processor 1556 and the multi-antenna receive processor 1558 implement various L1 layer signal processing functions. The multi-antenna receive processor 1558 performs receive analog precoding / beamforming operations on the baseband multi-carrier symbol stream from the receiver 1554. The receive processor 1556 uses a 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 receive processor 1556 demultiplexes the physical layer data signal and reference signal, where the reference signal is used for channel estimation. The data signal undergoes multi-antenna detection in the multi-antenna receive processor 1558 to recover any spatial streams destined for the first communications device 1550. The symbols on each spatial stream are demodulated and recovered in the receive processor 1556, and soft decisions are generated. The receive processor 1556 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communications device 1510 on the physical channel. The upper layer data and control signals are then provided to the controller / processor 1559. The controller / processor 1559 implements the functionality of the L2 layer. The controller / processor 1559 may be associated with a memory 1560 that stores program codes and data. The memory 1560 may be referred to as a computer-readable medium. During transmission from the second communications device 1510 to the first communications device 1550, the controller / processor 1559 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover the upper layer data packets from the second communications device 1510. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 layer for L3 processing.

[0377] During transmission from the first communications device 1550 to the second communications device 1510, upper layer data packets are provided to the controller / processor 1559 at the first communications device 1550 using a data source 1567. Data source 1567 represents all protocol layers above the L2 layer. Similar to the transmission functionality at the second communications device 1510 described in the transmission from the second communications device 1510 to the first communications device 1550, the controller / processor 1559 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, implementing L2 layer functions for both the user plane and the control plane. The controller / processor 1559 is also responsible for retransmission of lost packets and signaling to the second communications device 1510. The transmit processor 1568 performs modulation mapping and channel coding, while the multi-antenna transmit processor 1557 performs digital multi-antenna spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming. The transmit processor 1568 then modulates the resulting spatial stream into a multi-carrier / single-carrier symbol stream. After analog precoding and beamforming operations in the multi-antenna transmit processor 1557, the stream is provided 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 RF symbol stream before providing it to the antenna 1552.

[0378] During transmission from the first communication device 1550 to the second communication device 1510, the functionality at the second communication device 1510 is similar to the reception functionality at the first communication device 1550 described for transmission from the second communication device 1510 to the first communication device 1550. Each receiver 1518 receives RF signals via its corresponding antenna 1520, converts the received RF signals into baseband signals, and provides the baseband signals to a multi-antenna receive processor 1572 and a receive processor 1570. The receive processor 1570 and the multi-antenna receive processor 1572 collectively implement the L1 layer functionality. The controller / processor 1575 implements the L2 layer functionality. The controller / processor 1575 may be associated with a memory 1576 that stores program codes and data. The memory 1576 may be referred to as a computer-readable medium. During transmission from the first communications device 1550 to the second communications device 1510, the controller / processor 1575 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover upper layer data packets from the first communications device 1550. The upper layer data packets from the controller / processor 1575 can be provided to the core network or all protocol layers above the L2 layer, and various control signals can also be provided to the core network or L3 for L3 processing.

[0379] As an embodiment, the first communication device 1550 apparatus 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 apparatus at least: sends 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 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, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured to be used to determine the starting RO in the first RO set.

[0380] As an embodiment, the first communication device 1550 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, the action 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 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, and the first time offset includes a positive integer number of ROs; whether the first time offset is configured to be used to determine the starting RO in the first RO set.

[0381] As an embodiment, the first communication device 1550 corresponds to the first node in this application.

[0382] As an embodiment, the second communication device 1510 corresponds to the second node in this application.

[0383] As an embodiment, the first communication device 1550 is a user equipment, which can serve as a relay node.

[0384] As an embodiment, the first communication device 1550 is a user equipment supporting V2X, which can serve as a relay node.

[0385] As an embodiment, the first communication device 1550 is a user equipment supporting D2D, and the user equipment can serve as a relay node.

[0386] As an embodiment, the first communication device 1550 is a network control relay NCR.

[0387] As an embodiment, the first communication device 1550 is a relay wireless repeater.

[0388] As an embodiment, the first communication device 1550 is a relay.

[0389] As an embodiment, the second communication device 1510 is a base station.

[0390] As an embodiment, the antenna 1552, the transmitter 1554, the multi-antenna transmit processor 1557, the transmit processor 1568, and the controller / processor 1559 are used to send a first PRACH transmission on a first RO set.

[0391] As an embodiment, the antenna 1520, the receiver 1518, the multi-antenna receive processor 1572, the receive processor 1570, and the controller / processor 1575 are configured to receive a first PRACH transmission on a first RO set.

[0392] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0393] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0394] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0395] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0396] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0397] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0398] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0399] In the embodiments of the present application, "pre-defined" or "pre-configured" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., including a user device and a network device). The present application does not limit the specific implementation method. For example, pre-defined may refer to information defined in a protocol.

[0400] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0401] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0402] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0403] In the several embodiments provided in this 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 schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0404] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of the solution of this embodiment according to actual needs.

[0405] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0406] 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 process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. 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 available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0407] Those skilled in the art will appreciate that all or part of the steps in the above method 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 disk. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits. Accordingly, each module unit in the above embodiment can be implemented in the form of hardware or in the form of a software functional module. This application is not limited to any specific form of combination of software and hardware. The first node in this application includes but is not limited to mobile phones, tablet computers, notebooks, network cards, low-power devices, enhanced machine-type communication (eMTC) devices, narrowband Internet of Things (NB-IoT) devices, vehicle-mounted communication devices, aircraft, airplanes, drones, remote-controlled aircraft and other wireless communication devices. The second node in this application includes but is not limited to mobile phones, tablet computers, notebooks, network cards, low-power devices, eMTC devices, NB-IoT devices, vehicle-mounted communication devices, aircraft, airplanes, drones, remote-controlled aircraft and other wireless communication devices. The user equipment or UE or terminal in this application includes but is not limited to mobile phones, tablets, laptops, network cards, low-power devices, eMTC devices, NB-IoT devices, vehicle-mounted communication equipment, aircraft, airplanes, drones, remote-controlled aircraft and other wireless communication devices. The base station equipment or base station or network side equipment in this application includes but is not limited to macro cell base stations, micro cell base stations, home base stations, relay base stations, eNB, gNB, TRP, global navigation satellite system (GNSS), relay satellites, satellite base stations, aerial base stations and other wireless communication devices.

[0408] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method in a first node for wireless communication, characterized in that, Including: 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, 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.

2. The method according to claim 1, 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.

3. The method according to claim 2, 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 the 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 the Nr.

4. The method according to claim 1 or 2, characterized in that, The first period 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.

5. The method according to claim 4, 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 the 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 the Nr.

6. The method according to any one of claims 1-5, characterized in that The method further includes: Receiving 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.

7. The method according to any one of claims 1-6, characterized in that, The method further includes: Receiving a first SSB; Among them, the first SSB is one of the multiple SSBs included in the first SSB set. The multiple SSBs correspond one-to-one with the multiple SSB indexes. The first SSB index is the index of the first SSB among the multiple SSBs included in the first SSB set. The first mapping order is used for the multiple SSB indexes to be mapped to multiple alternative ROs within a first period.

8. The method according to any one of claims 1-7, characterized in that, The method further includes: Receiving first information; Among them, 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. The first information and the first mapping order are used to determine the multiple SSB indexes to be mapped to multiple alternative ROs within a first period.

9. The method according to any one of claims 1-8, characterized in that, The method further includes: Receiving second information; Among them, the second information includes the Nr, and the Nr is one of 2, 4, and 8.

10. A method in a second node for wireless communication, characterized in that, Including: 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 the 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 the 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.

11. The method according to claim 10, wherein The first period includes multiple alternative ROs. Any RO in the multiple RO sets belongs to the multiple 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 multiple 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.

12. The method according to claim 11, 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 multiple SSB indexes, the first SSB index, and the 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 indexes, the first SSB index, and the Nr.

13. The method according to claim 10 or 11, characterized in that, The first period includes multiple alternative RO sets. Any RO set in the multiple RO sets is one of the multiple alternative RO sets. Whether the first time offset is configured is used to determine the index of the first RO set among the multiple alternative RO sets.

14. The method according to claim 13, wherein 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.

15. The method according to any one of claims 10-14, characterized in that, 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.

16. The method according to any one of claims 10 - 15, characterized in that, The method further includes: Sending a first SSB; Wherein, the first SSB is one of the multiple SSBs included in a first SSB set, the multiple SSBs correspond one-to-one to the multiple SSB indexes, the first SSB index is the index of the first SSB among the multiple SSBs included in the first SSB set; a first mapping order is used for mapping the multiple SSB indexes to multiple alternative ROs within a first period.

17. The method according to any one of claims 10-16, characterized in that, The method further includes: Sending 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 the multiple SSB indexes to multiple alternative ROs within a first period.

18. The method according to any one of claims 10-17, characterized in that, The method further includes: Sending a second information; Wherein, the second information includes Nr, and Nr is one of 2, 4, and 8.

19. A first node for wireless communication, characterized in that, 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, the first SSB index is one of the 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 the 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, a first time offset is the time offset between any two adjacent RO sets among 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.

20. The first node according to claim 19, characterized in that, The first period includes multiple candidate ROs. Any RO in the multiple RO sets belongs to the multiple 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 multiple 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.

21. The first node according to claim 20, 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 multiple 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 multiple SSB indexes, the first SSB index, and Nr.

22. The first node according to claim 19 or 20, characterized in that, The first period includes multiple candidate RO sets. Any RO set in the multiple RO sets is one of the multiple candidate RO sets. Whether the first time offset is configured is used to determine the index of the first RO set among the multiple candidate RO sets.

23. The first node according to claim 22, wherein When the first time offset is configured, the index of the first RO set among the multiple candidate 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 candidate RO sets is related to the number of the multiple SSB indexes, the first SSB index, and Nr.

24. The first node according to any one of claims 19-23, characterized in that, 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.

25. The first node according to any one of claims 19-24, characterized in that, The first transceiver is further configured to receive a first SSB, where the first SSB is one of the multiple SSBs included in a first SSB set. The multiple SSBs correspond one-to-one to the multiple SSB indexes. The first SSB index is the index of the first SSB among the multiple SSBs included in the first SSB set. A first mapping order is used for the multiple SSB indexes to be mapped to multiple candidate ROs within the first period.

26. The first node according to any one of claims 19 - 25, characterized in that, The first transceiver is further configured to receive a 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. The first information and the first mapping order are used to determine the multiple SSB indexes to be mapped to multiple candidate ROs within the first period.

27. The first node according to any one of claims 19-26, characterized in that, The first transceiver is further configured to receive a second information, where the second information includes Nr, and Nr is one of 2, 4, and 8.

28. A second node for wireless communication, characterized in that, Comprising: A second transceiver for 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 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.

29. The second node according to claim 28, 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.

30. The second node according to claim 29, 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.

31. The second node according to claim 28 or 29, characterized in that, The first period 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.

32. The second node according to claim 31, 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.

33. The second node according to any one of claims 28 - 32, characterized in that, 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.

34. The second node according to any one of claims 28 - 33, characterized in that, The second transceiver is further configured to transmit 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; a first mapping order is used for mapping the plurality of SSB indexes to a plurality of alternative ROs within a first period.

35. The second node according to any one of claims 28-34, characterized in that, The second transceiver is further configured to transmit 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 a first period.

36. The second node according to any one of claims 28 - 35, characterized in that The second transceiver is further configured to transmit second information, where the second information includes the Nr, and the Nr is one of 2, 4, and 8.

37. A node used for wireless communication, characterized in that, Comprising a transceiver, a memory, and a processor, the memory is used to store a program, and the processor is used to call the program in the memory and control the transceiver to receive or transmit signals, so that the node executes the method according to any one of claims 1-9 or 10-18.

38. A device, characterized in that, Comprising a processor, configured to call a program from a memory, so that the device executes the method according to any one of claims 1-9 or 10-18.

39. A chip, characterized in that, Comprising a processor, configured to call a program from a memory, such that a device installed with the chip executes the method according to any one of claims 1-9 or 10-18.

40. A computer-readable storage medium, characterized in that, Stored thereon is a program, and the program causes a computer to execute the method according to any one of claims 1-9 or 10-18.

41. A computer program product, characterized in that, Comprising a program, and the program causes a computer to execute the method according to any one of claims 1-9 or 10-18.

42. A computer program, characterized in that, The computer program causes a computer to execute the method according to any one of claims 1-9 or 10-18.

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