First node for wireless communication, second node for wireless communication, and method for a node used in wireless communication.

Abstract

The present application provides a method and apparatus for use in nodes of wireless communication. The method comprises: receiving a first synchronization signal block, an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; and sending a first preamble group, the first preamble group comprising a plurality of preambles. A first random access channel occasion group comprises a plurality of random access channel occasions, and the plurality of random access channel occasions are respectively used for sending the plurality of preambles; any two random access channel occasions in the first random access channel occasion group are orthogonal in a time domain. The plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups according to a first mapping order, and the first random access channel occasion group is one of the plurality of random access channel occasion groups; the first random access channel occasion group corresponds to a first occasion group type; the index of the first synchronization signal block, the first occasion group type, and the first mapping order are used for determining the first random access channel occasion group.

Description

1 / 74 “FIRST NODE FOR WIRELESS COMMUNICATION, SECOND NODE FOR WIRELESS COMMUNICATION AND METHOD FOR A NODE USED IN WIRELESS COMMUNICATION” Technical Field

[001] This application relates to the field of communication technologies and, more specifically, to a method and apparatus for a node used for wireless communication. Background of the Invention

[002] To improve random access coverage performance, a scheme based on multiple physical random access channel (PRACH) transmissions is planned to be introduced in some communication systems, such as a New Radio (NR) system. However, in a multiple PRACH transmission scenario, a conventional mapping method between a synchronization signal block / physical transmission channel (SSB block or SS / PBCH, for short) and a random access occasion (RO, also called a PRACH occasion) used for wireless communication can cause a plurality of random access occasions to overlap in the time domain. This entails higher system configuration requirements, as well as increased system processing complexity and higher transmission power costs.This can cause a relatively large time interval between a plurality of random access occasions, thus increasing the access delay of a system, or it can result in low efficiency in the use of random access resources, or it can result in an increase in additional signaling costs. Brief Description of the Invention

[003] In view of this, the embodiments of the present application aim to provide a method and apparatus for a node used for communication. Petition 870250075078, dated 08 / 25 / 2025, page 10 / 183 2 / 74 wireless. Several aspects of the present application are described below.

[004] According to a first aspect, a method is provided for a first node used for wireless communication, including: receiving a first synchronization signal block, wherein an index of the first synchronization signal block is one among a plurality of candidate synchronization signal block indices; and transmitting a first group of preambles, wherein the first group of preambles includes a plurality of preambles. A first group of random access channel occasions includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first group of random access channel occasions is used to transmit the plurality of preambles in the first group of preambles. Any two random access channel occasions in the first group of random access channel occasions are orthogonal in the time domain.The plurality of candidate synchronization signal block indices is mapped to a plurality of random access channel occasion groups according to a first mapping order, and the first random access channel occasion group is one among the plurality of random access channel occasion groups. The first random access channel occasion group corresponds to a first occasion group type, and the first occasion group type is one among a plurality of candidate occasion group types. The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[005] According to a second aspect, a method is provided for a second node used for wireless communication, including: transmitting one or more synchronization signal blocks, where a first synchronization signal block is one of one or more synchronization signal blocks, and a Petition 870250075078, dated 08 / 25 / 2025, page 11 / 183 3 / 74 The index of the first synchronization signal block is one among a plurality of candidate synchronization signal block indices; and receive a first group of preambles, where the first group of preambles includes a plurality of preambles. A first group of random access channel occasions includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first group of random access channel occasions is used to transmit the plurality of preambles in the first group of preambles. Any two random access channel occasions in the first group of random access channel occasions are orthogonal in the time domain.The plurality of candidate synchronization signal block indices is mapped to a plurality of random access channel occasion groups according to a first mapping order, and the first random access channel occasion group is one among the plurality of random access channel occasion groups. The first random access channel occasion group corresponds to a first occasion group type, and the first occasion group type is one among a plurality of candidate occasion group types. The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[006] According to a third aspect, a first node used for wireless communication is provided, including: a first receiver set, configured to receive a first synchronization signal block, wherein an index of the first synchronization signal block is one among a plurality of candidate synchronization signal block indices; and a first transmitter set, configured to transmit a first group of preambles, wherein the first group of preambles includes a plurality of preambles. A first group of random access channel occasions includes a plurality Petition 870250075078, dated 08 / 25 / 2025, page 12 / 183 4 / 74 of random access channel occasions, and the plurality of random access channel occasions in the first group of random access channel occasions is used to transmit the plurality of preambles in the first group of preambles. Any two random access channel occasions in the first group of random access channel occasions are orthogonal in the time domain. The plurality of candidate synchronization signal block indices is mapped to a plurality of random access channel occasion groups according to a first-order mapping, and the first group of random access channel occasions is one among the plurality of random access channel occasion groups. The first group of random access channel occasions corresponds to a first type of occasion group, and the first type of occasion group is one among a plurality of candidate occasion group types.The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[007] According to a fourth aspect, a second node used for wireless communication is provided, including: a first transmitter set, configured to transmit one or more synchronization signal blocks, wherein a first synchronization signal block is one among one or more synchronization signal blocks, and an index of the first synchronization signal block is one among a plurality of candidate synchronization signal block indices; and a first receiver set, configured to receive a first group of preambles, wherein the first group of preambles includes a plurality of preambles. A first group of random access channel occasions includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first group of random access channel occasions is used to transmit the Petition 870250075078, dated 08 / 25 / 2025, page 13 / 183 5 / 74 Plurality of preambles in the first group of preambles. Any two random access channel occasions in the first group of random access channel occasions are orthogonal in the time domain. The plurality of candidate synchronization signal block indices is mapped to a plurality of random access channel occasion groups according to a first mapping order, and the first group of random access channel occasions is one among the plurality of random access channel occasion groups. The first group of random access channel occasions corresponds to a first type of occasion group, and the first type of occasion group is one among a plurality of candidate occasion group types. The index of the first synchronization signal block, the first type of occasion group, and the first mapping order are used to determine the first group of random access channel occasions.

[008] According to a fifth aspect, a first node used for wireless communication is provided, including a processor, memory, and a communication interface. The memory is configured to store one or more computer programs, and the processor is configured to call the computer programs in memory to cause the first node to execute some or all of the steps of a method according to the first aspect.

[009] According to a sixth aspect, a second node used for wireless communication is provided, including a processor, memory, and a communication interface. The memory is configured to store one or more computer programs, and the processor is configured to call the computer programs in memory to cause the second node to execute some or all of the steps of a method according to the second aspect.

[010] According to a seventh aspect, a form of realization Petition 870250075078, dated 08 / 25 / 2025, page 14 / 183 Item 6 / 74 of this application provides a communications system, and the system includes the first node and / or the second node described above. In another possible design, the system may also include another device interacting with the first node or the second node in the solution provided in the embodiments of this application.

[011] According to an eighth aspect, an embodiment of the present application provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and the computer program causes a first node or a second node to perform some or all of the steps of the methods according to the preceding aspects.

[012] According to a ninth aspect, one embodiment of the present application provides a computer program product. The computer program product includes a non-transient, computer-readable storage medium that stores a computer program, and the computer program is operable to cause a first node or a second node to perform some or all of the steps of the methods according to the preceding aspects. In some implementations, the computer program product may be a software installation package.

[013] According to a tenth aspect, one embodiment of the present application provides a chip. The chip includes a memory and a processor, and the processor can call and execute a computer program from memory to implement some or all of the steps of the methods according to the preceding aspects.

[014] In embodiments of the present application, a first node may determine, based on an index of a first synchronization signal block, a first occasion group type and a first mapping order, a first random access channel occasion group corresponding to the first synchronization signal block, such that any Petition 870250075078, dated 08 / 25 / 2025, page 15 / 183 7 / 74 two random access channel occasions in the first group of random access channel occasions determined are orthogonal in the time domain, that is, any two random access channel occasions in the first group of random access channel occasions do not overlap in the time domain.

[015] In embodiments of the present application, any two random access channel occasions in the first random access channel occasion group determined by the first node based on the index of the first synchronization signal block, in the first occasion group type and in the first mapping order do not overlap in the time domain. In embodiments of the present application, a method for mapping a synchronization signal block and a random access occasion is modified to ensure that any two random access channel occasions in the first random access channel occasion group do not overlap in the time domain, so that a system configuration requirement can be reduced, the system processing complexity can be reduced, and transmission power costs can be reduced.

[016] The method for mapping a synchronization signal block and a random access occasion provided in the embodiments of the present application helps to ensure a small time interval between a plurality of random access channel occasions in the first group of random access channel occasions, so that the access delay of a system is reduced.

[017] Furthermore, the method for mapping a synchronization signal block and a random access occasion provided in the embodiments of the present application helps to improve the efficiency of using random access resources or helps to reduce signaling costs. Brief Description of the Figures

[018] Figure 1 is an illustrative diagram of a system architecture for a wireless communications system in which the forms of Petition 870250075078, dated 08 / 25 / 2025, page 16 / 183 8 / 74 of the present request are applicable.

[019] Figure 2 is an illustrative diagram of a mapping relationship between a synchronization signal block and a random access channel occasion.

[020] Figure 3 is a schematic flowchart of a method used for wireless communication according to an embodiment of the present application.

[021] Figure 4 is an illustrative diagram of a mapping relationship between a synchronization signal block and a group of random access channel occasions according to one embodiment of the present application.

[022] Figure 5 is an example diagram of a mapping relationship between a synchronization signal block and a group of random access channel occasions according to another embodiment of the present application.

[023] Figure 6 is an illustrative diagram of a mapping relationship between a synchronization signal block and a group of random access channel occasions, according to another embodiment of the present application.

[024] Figure 7 is a schematic flowchart of a method used for wireless communication, according to another embodiment of the present application.

[025] Figure 8 is a schematic structural diagram of a first node, according to one embodiment of the present application.

[026] Figure 9 is a schematic structural diagram of a second node, according to one embodiment of the present application.

[027] Figure 10 is a schematic structural diagram of a communication apparatus, according to one embodiment of the present Petition 870250075078, dated 08 / 25 / 2025, page 17 / 183 9 / 74 request.

[028] Figure 11 is a schematic diagram of the hardware modules of a communications device, according to one embodiment of the present application. Detailed Description of Implementation Methods

[029] The technical solutions in the embodiments of this application are described clearly and completely below, with reference to the attached drawings in the embodiments of this application. Apparently, the embodiments described are only some, but not all, of the embodiments of this application. Communication System Architecture

[030] Figure 1 is an illustrative diagram of a system architecture of a wireless communications system (100) to which embodiments of the present application are applicable. The wireless communications system (100) may include a network device (110) and a user equipment (UE) (120). The network device (110) may be a device in communication with the UE (120). The network device (110) may provide communication coverage for a specific geographic area and may communicate with a UE (120) located within that coverage.

[031] Figure 1 shows an example in which there is one network device and two UEs. Optionally, the wireless communications system (100) may include a plurality of network devices, and another number of UEs may be included in the coverage of each network device, which is not limited in the embodiments of the present application.

[032] Optionally, the wireless communications system (100) may also 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. Petition 870250075078, dated 08 / 25 / 2025, page 18 / 183 10 / 74

[033] It should be understood that, although the technical solutions of the embodiments of the present application are directed to random access, the technical solutions of the embodiments of the present application can also be applied to beam fault recovery. Furthermore, although the technical solutions of the embodiments of the present application are described for a Type 1 random access procedure, the technical solutions of the embodiments of the present application can also be applied to a Type 2 random access procedure. In addition, although the technical solutions of the embodiments of the present application are described for a Uu interface, the technical solutions of the embodiments of the present application can also be applied to a PC5 interface.Furthermore, although the technical solutions of the embodiments of this application are described for single-carrier communication, the technical solutions of the embodiments of this application can also be applied to multi-carrier communication. Additionally, although the technical solutions of the embodiments of this application are described for multi-antenna communication, the technical solutions of the embodiments of this application can also be applied to single-antenna communication. Furthermore, although the technical solutions of the embodiments of this application are described for a single UE and base station scenario, the technical solutions of the embodiments of this application are also applicable to a vehicle-to-everything (V2X) scenario and to a scenario where a UE communicates with a relay and the relay communicates with a base station, achieving a technical effect similar to that of the single UE and base station scenario.Furthermore, the technical solutions of the embodiments of the present application can be applied to various communication scenarios, such as an enhanced mobile broadband (eMBB) scenario, an ultra-reliable low-latency communications (URLLC) scenario, and a communication scenario. Petition 870250075078, dated 08 / 25 / 2025, page 19 / 183 11 / 74 massive machine-type technology (mMTC). Furthermore, using a unified solution for different scenarios can also help reduce hardware complexity and cost.

[034] It should be understood that, in the absence of conflict, the embodiments and embodiments of the embodiments for a first node of this application may be applied to a second node and vice versa. In the absence of conflict, the embodiments and embodiments of the embodiments of this application may be arbitrarily combined with each other.

[035] It should be understood that the technical solutions in the embodiments of this application can be applied to various communication systems, for example, a 5th generation (5G) system or a New Radio (NR) system, a long-term evolution (LTE) system, a frequency division duplex (FDD) LTE system and a time division duplex (TDD) LTE system. The technical solutions provided in this application can also be applied to future communication systems, such as a 6th generation mobile communications system and a satellite communications system.

[036] The UE in the embodiments of this application may also be referred to as a terminal device, an access terminal, a subscriber unit, a subscriber station, a mobile device, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communications device, a user agent or a user apparatus. The UE in the embodiments of this application may be a device that provides the user with voice and / or data connectivity and is capable of connecting people, objects and machines, such as a portable device or a vehicle-mounted device with wireless connectivity function. The UE in the embodiments of this application may be a mobile phone, a tablet (pad), a notebook, a palmtop, a mobile internet device (MID), a Petition 870250075078, dated 08 / 25 / 2025, page 20 / 183 12 / 74 wearable device, a virtual reality (VR) vehicle, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in autonomous driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart network, a wireless terminal in transport security, a wireless terminal in a smart city, a wireless terminal in a smart home, or similar. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity, providing a side-link signal between UEs in V2X or device-to-device (D2D), or similar. For example, a mobile phone and a vehicle can communicate using a side-link signal. A mobile phone and a smart home device can communicate without the need to relay a communication signal through a base station.

[037] The network device in the embodiments of this application may be a device for communication with the UE. The network device may also be referred to as an access network device or a wireless access network device. For example, the network device may be a base station. The network device, in the embodiments of this application, may be a radio access network (RAN) node (or device) that accesses the UE via a wireless network.The term base station can broadly encompass several of the following names, or it can be interchangeable with the following names, for example, a NodeB, an evolved NodeB (eNB), a next-generation NodeB (gNB), a relay station, an access point, a transmit / receive point (TRP), a transmit point (TP), a master eNB (MeNB), a secondary eNB (SeNB), a multi-pattern radio node (MSR), a home base station, a network controller, an access node, a radio node, an access point (AP), a transmit node, a transceiver node, a baseband unit (BBU), a remote radio unit (RRU), a... Petition 870250075078, dated 08 / 25 / 2025, page 21 / 183 13 / 74 active antenna unit (AAU), a remote radio head (RRH), a central unit (CU), a distributed unit (DU), and a positioning node. The base station may be a macro base station, a micro base station, a relay node, a donor node, or similar, or a combination thereof. Alternatively, the base station may be a communication module, a modem, or a chip housed in the device or apparatus described above. Alternatively, the base station may be a mobile switching center, a device that functions as a base station in D2D, V2X, and machine-to-machine (M2M) communications, a network-side device in a 6G network, a device that functions as a base station in a future communications system, or similar. The base station may support networks with the same access technology or with different access technologies.The specific technology and specific format of the device used by the network device are not limiting factors in the embodiment of this application.

[038] The base station 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 according to the position of the mobile base station. In other examples, a helicopter or drone can be configured to serve as a device in communication with another base station.

[039] In some implementations, the network device in the embodiments of this application may be a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[040] The network device and the UE can be deployed on land, including indoor or outdoor environments, portable or vehicle-mounted; or they can be deployed on water; or they can be deployed on an airplane, a balloon, and a satellite in the air. In the embodiments of the present application, the scenarios in which the network device and the UE are located do not Petition 870250075078, dated 08 / 25 / 2025, page 22 / 183 14 / 74 are limited.

[041] It should be understood that all or some of the functions of the communications device in the present application may also be implemented by software functions running on hardware or by virtualization functions instantiated on a platform (such as a cloud platform).

[042] It should be understood that, for an explanation of the terminology in the embodiments of this application, one may consult the description protocols of the TS36 series, TS37 series and TS38 series of 3GPP, as well as the description protocols of the Institute of Electrical and Electronics Engineers (IEEE). PRACH Transmission Coverage Enhancements

[043] The coverage performance of a communications system (e.g., an NR system) is an important factor that needs to be considered when an operator undertakes the commercial deployment of a communications network, as the coverage performance of a communications system directly affects the quality of service of the communications system and the operator’s costs, e.g., the operator’s capital expenditure (CAPEX) and the operator’s operating expenditure (OPEX).

[044] The coverage performance of a communications system varies with the different operating frequency bands of the communications system. For example, compared to an LTE system, the operating frequency band of an NR system is higher (e.g., a millimeter wave frequency band), which results in greater path loss for the NR system, thus resulting in lower coverage performance for the NR system. Therefore, as the frequency band supported by a communications system can become increasingly higher, increasing the coverage of the communications system becomes a problem. Petition 870250075078, dated 08 / 25 / 2025, page 23 / 183 15 / 74 to be resolved.

[045] In most practical deployment scenarios, since the capacity of a UE is less than that of a network device, the coverage performance of an uplink is a bottleneck for increasing the coverage of a communications system. With the development of communication technologies, uplink services in some emerging vertical use cases gradually increase; for example, in a video upload service, in a scenario with many uplink services, increasing uplink coverage is a problem that needs to be solved.

[046] In the related state of the art, there is a technical solution for increasing coverage for some uplinks. For example, in NR Edition 17 (Rel-17), a coverage enhancement solution was designed for a shared physical uplink channel (PUSCH), a physical uplink control channel (PUCCH), and a message 3 (Msg 3) in a random access procedure.

[047] However, there is no coverage enhancement solution designed for a PRACH in Rel-17, but the performance of the PRACH transmission is very important for many procedures, such as an initial access procedure and a beam failure recovery procedure, and therefore it is also very important to perform coverage enhancement on a PRACH. Based on this, Rel-18 formally establishes a work item (WI) of “additional NR coverage enhancements”, in which enhancing the coverage performance of the PRACH transmission is one of the important topics of the work item.

[048] As a possible implementation, multiple PRACH transmissions can be used for PRACH transmission coverage enhancement. In other words, PRACH transmission coverage enhancement can be implemented through transmissions of Petition 870250075078, dated 08 / 25 / 2025, page 24 / 183 16 / 74 repeated PRACHs (for example, a preamble is sent in a PRACH several times).

[049] In embodiments of the present application, multiple PRACH transmissions may refer to multiple PRACH transmissions carried out using the same beam, or may refer to multiple PRACH transmissions carried out using different beams. Multiple PRACH transmissions carried out using the same beam are used as an example. An agreement was reached at the 1#110-bis-e meeting of the Radio Access Network (RAN) 3GPP Partnership Project that PRACH occasions (or referred to as RACH occasions) at different time instances may be used for multiple PRACH transmissions carried out using the same beam.Furthermore, in the RAN1#110-bis-e meeting, a repetition factor for multiple PRACH transmissions (a quantity / times of multiple PRACH transmissions) performed using the same beam is defined in more detail, and the repetition factor may include at least two or four, and subsequently the repetition factor may also likely include eight. Mapping of Synchronization Signal Block Associations and PRACH Occasions

[050] A synchronization signal block is a signal structure defined in a communication standard and may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical transmission channel (PBCH). In some embodiments, the synchronization signal block may be represented as a synchronization signal block (SSB), and in other embodiments, the synchronization signal block may also be represented as a synchronization signal / physical transmission channel block (SS / PBCH block), i.e., the synchronization signal block may also be referred to as a transmission channel block. Petition 870250075078, dated 08 / 25 / 2025, page 25 / 183 17 / 74 synchronization signal, which is not limited to the embodiments of the present application. It should be noted that the following description uses an example in which the synchronization signal block is represented as an SSB and, certainly, the SSB in the following description can be replaced by an SS / PBCH block.

[051] An SSB is a group of transmitted resources on an orthogonal frequency division multiplexing basic grid, and the resource group may include, for example, one or more of the following resources: a time domain resource, a frequency domain resource, and a code domain resource.

[052] In a process where a UE performs initial access or beam fault recovery, upon detecting an SSB sent by a network device, the UE can obtain an SSB index of the SSB, so that the position in the time domain where the SSB is located can be learned in order to implement downlink synchronization with the network device. To implement uplink synchronization, the UE needs to transmit a preamble to the network device. The way the UE selects a preamble to be sent and on which PRACH occasion the selected preamble should be sent are determined by the UE based on the received (or detected) SSB.

[053] As a technically viable solution, an SSB can be associated and mapped with at least one preamble on at least one PRACH occasion, so that when the UE performs initial access or beam failure recovery, a PRACH occasion and an associated preamble can be determined based on a received SSB, so that a PRACH transmission can continue to be performed.

[054] In the related state of the art, an association and mapping relationship between an SSB and a PRACH / preamble occasion follows the following order: first, in ascending order of preamble indices in a single PRACH occasion; second, in ascending order of indices of Petition 870250075078, dated 08 / 25 / 2025, page 26 / 183 18 / 74 frequency domain features for frequency multiplexed PRACH occasions; and third, in ascending order of time domain feature indices for time multiplexed PRACH occasions within a PRACH slot; and fourth, in ascending order of indices for PRACH slots.

[055] An example of the association and mapping relationship between an SSB and a PRACH occasion is provided below with reference to Figure 2. In the example in Figure 2, it is assumed that there are eight SSB beams, and the SSB indices corresponding to the eight SSB beams are SSB0-SSB7; the value of the SSB-perRACH-Occasion parameter sent by a network device to a UE is 1 / 2; and the value of the number of frequency-multiplexed PRACH occasions sent by the network device to the UE is 4. In this case, the PRACH occasions corresponding to the SSBs are shown in Figure 2, where each block in the Figure represents a PRACH occasion.

[056] As mentioned above, an improvement in PRACH coverage can be achieved through multiple PRACH transmissions. In a multiple PRACH transmission scenario, if a plurality of PRACH occasions associated with SSBs is determined using the association and mapping relationship mentioned earlier, a plurality of PRACH occasions associated with the same SSB can overlap in the time domain, thus increasing the transmission power costs of a device.

[057] Furthermore, in a scenario of multiple PRACH transmissions performed using the same beam, if a plurality of PRACH occasions associated with SSBs are determined using the association and mapping relationship mentioned earlier, a collision will also occur with a scheme of orthogonal PRACH occasions in the time domain for multiple PRACH transmissions, obtained in a RAN1#110-bis-e meeting. Petition 870250075078, dated 08 / 25 / 2025, page 27 / 183 19 / 74

[058] In conclusion, in a scenario of multiple PRACH transmissions, the question of how to determine a plurality of PRACH occasions associated with an SSB based on the SSB is a problem that needs to be solved.

[059] To solve the aforementioned problem, the embodiments of the present application provide a method and apparatus for a node used for wireless communication, which can effectively associate and map an SSB to a plurality of orthogonal PRACH instances in the time domain, thereby helping to reduce transmission power costs.

[060] The embodiments of the present application may be applied to a scenario of multiple PRACH transmissions, i.e., repeated transmissions of a plurality of PRACHs may be used to implement PRACH coverage enhancement.

[061] In some embodiments, the multiple PRACH transmissions mentioned in the embodiments of this application may refer to multiple PRACH transmissions performed using the same beam; in this case, repeated transmissions of a plurality of PRACHs are performed on the same beam to obtain a gain in signal-to-noise ratio (SNR). In some embodiments, the multiple PRACH transmissions mentioned in the embodiments of this application may refer to multiple PRACH transmissions performed using different beams; in this case, repeated transmissions of a plurality of PRACHs are performed on different beams to obtain a diversity gain.

[062] It should be noted that the beam mentioned in the embodiments of this application may be replaced by another term, such as antenna port, spatial filter and spatial parameter, and the meanings expressed by the terms may be consistent. There is no distinction between the terms in the embodiments of Petition 870250075078, dated 08 / 25 / 2025, page 28 / 183 20 / 74 fulfillment of this request.

[063] The embodiments of the present application may be applied to an initial access procedure or to a beam fault recovery procedure. The initial access procedure is used as an example; the embodiments of the present application may be applied to a four-step random access procedure (i.e., type 1 random access procedure) or to a two-step random access procedure (i.e., type 2 random access procedure), which is not limited to the embodiments of the present application.

[064] The embodiments of the method of the present application will be described below in detail with reference to the drawings. Figure 3 is a schematic flowchart of a method for a node used for wireless communication, according to an embodiment of the present application. The method shown in Figure 3 is presented from the perspective of an interaction between a first node and a second node.

[065] In one embodiment, the first node may be a network-controlled repeater (NCR).

[066] In one embodiment, the first node can be a UE, for example, a UE (120) shown in Figure 1.

[067] In one embodiment, the first node may be a relay, such as a relay terminal.

[068] In one embodiment, the second node can be a network device, for example, a network device (110) shown in Figure 2.

[069] The method shown in Figure 3 may include Step (S310) and Step (S320), and these steps will be presented below.

[070] In Step (S310), the first node receives a first block of synchronization signal. Petition 870250075078, dated 08 / 25 / 2025, page 29 / 183 21 / 74

[071] An index of the first synchronization signal block is one among a plurality of candidate synchronization signal block indices.

[072] In one embodiment, the first synchronization signal block may be one of one or more synchronization signal blocks sent by the second node.

[073] In one embodiment, a synchronization signal block (for example, a first synchronization signal block and one or more synchronization signal blocks sent by the second node) may be represented as an SSB; or the synchronization signal block may be represented as an SS / PBCH block, which is not limited to the embodiments of the present application.

[074] In one embodiment, the index of the first synchronization signal block is mapped to a first group of random access channel occasions. The first group of random access channel occasions includes a plurality of random access channel occasions.

[075] In one embodiment, the plurality of random access channel occasions included in the first group of random access channel occasions may be represented as RACH occasions (ROs) or PRACH occasions (PROs), which is not limited to the embodiments of the present application.

[076] In Step (S320), the first node transmits a first group of preambles. The first group of preambles includes a plurality of preambles. In some embodiments, a preamble may also be referred to as a preamble code, which is not limited to the embodiments of the present application.

[077] The plurality of random access channel occasions in the first group of random access channel occasions is used to transmit the plurality of preambles in the first group of preambles. In other Petition 870250075078, dated 08 / 25 / 2025, page 30 / 183 22 / 74 words, the plurality of preambles in the first group of preambles can be transmitted in the plurality of random access channel occasions in the first group of random access channel occasions, for example, each preamble is transmitted in one random access channel occasion.

[078] Any two random access channel occasions in the first group of random access channel occasions are orthogonal in the time domain. Thus, any two random access channel occasions in the first group of random access channel occasions do not overlap in the time domain, i.e., a plurality of random access channel occasions to which the first synchronization signal block is associated and mapped do not overlap in the time domain.

[079] In one embodiment, any random access channel occasion in the first group of random access channel occasions is valid. For example, for a paired spectrum or a supplementary uplink band, all random access channel occasions may be valid. Alternatively, for an unpaired spectrum, a random access channel occasion may be valid if a specific condition is met, and the condition may be, for example, associated with the tdd-UL-DLConfigurationCommon parameter or similar.

[080] In one embodiment, the plurality of candidate synchronization signal block indices described above can be mapped to a plurality of random access channel occasion groups in a first-order mapping, where the first random access channel occasion group is one among the plurality of random access channel occasion groups. The manner in which the plurality of candidate synchronization signal block indices is mapped to a plurality of random access channel occasion groups in a first-order mapping will be described in detail below, and the details are not described Petition 870250075078, dated 08 / 25 / 2025, page 31 / 183 23 / 74 here.

[081] In one embodiment, any group of random access channel occasions in the plurality of groups of random access channel occasions includes at least one random access channel occasion. The plurality of groups of random access channel occasions, including the first group of random access channel occasions, is used as an example. The first group of random access channel occasions may include at least one random access channel occasion.

[082] In one embodiment, any group of random access channel occasions in the plurality of groups of random access channel occasions includes a plurality of (two or more) random access channel occasions. For example, the first group of random access channel occasions may include a plurality of random access channel occasions.

[083] In one embodiment, any two random access channel occasions included in any group of random access channel occasions in the plurality of groups of random access channel occasions are orthogonal in the time domain.

[084] In one embodiment, any two random access channel occasions being orthogonal in the time domain can be understood as if any two random access channel occasions were distributed in different time instances. In some embodiments, the time instance can alternatively be replaced by another term, such as time interval, which is not limited in the embodiments of the present application.

[085] In one embodiment, any group of random access channel occasions in the plurality of random access channel occasion groups is valid. For example, for a paired spectrum or a supplementary uplink band, all random access channel occasion groups Petition 870250075078, dated 08 / 25 / 2025, page 32 / 183 24 / 74 may be valid. Alternatively, for an unpaired spectrum, random access channel occasion groups may be valid if a specific condition is met, and the condition may be, for example, associated with the tdd-UL-DL-ConfigurationCommon parameter or similar.

[086] In one embodiment, one or more random access channel occasions included in any group of random access channel occasions in the plurality of groups of random access channel occasions are valid.

[087] In one embodiment, at least two random access channel occasions in at least one group of random access channel occasions in the plurality of groups of random access channel occasions are in two different slots. For example, a first period includes three random access channel slots (PRACH slots), and one or more groups of random access channel occasions from the plurality of groups of random access channel occasions may occupy two or three PRACH slots in the three PRACH slots.

[088] In one embodiment, all random access channel occasions included in any group of random access channel occasions in the plurality of groups of random access channel occasions are in the same slot, that is, all random access channel occasions included in any group of random access channel occasions in the plurality of groups of random access channel occasions are in the same PRACH slot.

[089] In one embodiment, any group of random access channel occasions in the plurality of random access channel occasion groups may include a plurality of preambles. Thus, after determining a group of random access channel occasions (which may be any group of random access channel occasions in the plurality of Petition 870250075078, dated 08 / 25 / 2025, page 33 / 183 25 / 74 random access channel occasion groups) corresponding to the first synchronization signal block according to an index of the first received (detected) synchronization signal block, the first node can transmit preambles in the random access channel occasion group.

[090] In one embodiment, for any group of random access channel occasions in the plurality of random access channel occasion groups, the preamble indices included in any random access channel occasion in the random access channel occasion group may be the same. The first group of random access channel occasions in the plurality of random access channel occasion groups is used as an example; the preamble indices included in a plurality of random access channel occasions included in the first group of random access channel occasions may all be the same. For example, the preamble indices included in a plurality of random access channel occasions included in the first group of random access channel occasions may range from 0 to 63.

[091] In one embodiment, for any group of random access channel occasions in the plurality of random access channel occasion groups, the preamble indices included in any random access channel occasion in the random access channel occasion group may be different or partially different. The first group of random access channel occasions in the plurality of random access channel occasion groups is still used as an example; the preamble indices included in a plurality of random access channel occasions included in the first group of random access channel occasions may be different. For example, the first group of random access channel occasions includes four random access channel occasions, and the preamble indices included in the four random access channel occasions may Petition 870250075078, dated 08 / 25 / 2025, page 34 / 183 26 / 74 could be in the intervals of 0 to 63, 64 to 127, 128 to 191, and 192 to 255, respectively.

[092] In one embodiment, the first random access channel occasion group corresponds to a first occasion group type, that is, the first random access channel occasion group corresponds to the first occasion group type. The first occasion group type is one among a plurality of candidate occasion group types. The first occasion group type and / or a candidate occasion group type may include a plurality of information types, such as a repetition factor, a frequency hopping indication, and a frequency hopping pattern, which will be described below in detail with reference to specific examples, and the details are not described here.

[093] In embodiments of the present application, the index of the first synchronization signal block, the first occasion group type, and the first mapping order can be used to determine the first random access channel occasion group. Thus, after receiving the first synchronization signal block, the first node can determine, based on the index of the first synchronization signal block, the first occasion group type, and the first mapping order, the first random access channel occasion group corresponding to the first synchronization signal block. Furthermore, a plurality of random access channel occasions included in the first random access channel occasion group, which is determined by the first node based on the index of the first synchronization signal block, the first occasion group type, and the first mapping order, are orthogonal to each other in the time domain.Furthermore, the first node transmits a plurality of preambles in the first group of preambles in a plurality of random access channel occasions of the first group of random access channel occasions, so that the delay. Petition 870250075078, dated 08 / 25 / 2025, page 35 / 183 The 27 / 74 random access rate can be reduced, and the efficiency of using random access resources can be improved.

[094] In one embodiment, the index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group from a plurality of random access channel occasion groups.

[095] In one embodiment, the index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group from a plurality of random access channel occasion groups in the first period.

[096] In one embodiment, the index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine any random access channel occasion in the first group of random access channel occasions from a plurality of random access channel occasions in the first period.

[097] An implementation for determining the first random access channel occasion group using the index of the first synchronization signal block, the first occasion group type, and the first mapping order is not limited to the embodiments of the present application, provided that the first random access channel occasion group corresponding to the first synchronization signal block can be determined by combining the three types of information above, or provided that the first random access channel occasion group can be selected from the plurality of random access channel occasion groups using the three types of information above in the embodiments of the present application. A Petition 870250075078, dated 08 / 25 / 2025, page 36 / 183 28 / 74 below, examples are provided of various implementations for determining the first random access channel occasion group using the index of the first synchronization signal block, the first occasion group type, and the first mapping order.

[098] In one embodiment, the index of the first synchronization signal block, the first occasion group type, and the first mapping order used to determine the first random access channel occasion group include: the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups correspond, respectively, to at least two different candidate occasion group types, and the first occasion group type is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

[099] In one embodiment, the index of the first synchronization signal block, the first occasion group type, and the first mapping order used to determine the first random access channel occasion group include: the first occasion group type is used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel occasion group from the at least L random access channel occasion groups, where L is a positive integer greater than 1.

[0100] In one embodiment, L is one of {4, 8, 64}.

[0101] In one form of realization, any group of occasions Petition 870250075078, dated 08 / 25 / 2025, page 37 / 183 29 / 74 of random access channel in the plurality of random access channel occasion groups is in the first period.

[0102] In one embodiment, the first period can be understood as a mapping cycle of a synchronization signal block and a random access channel occasion.

[0103] In one embodiment, the first period may include one or more PRACH slots. The first period including a plurality of PRACH slots is used as an example; the quantity of a plurality of PRACH slots included in the first period is not limited in the embodiments of the present application. For example, the first period may include three PRACH slots, four PRACH slots, or a larger quantity of PRACH slots.

[0104] In one embodiment, any random access channel occasion of any group of random access channel occasions in the plurality of groups of random access channel occasions is in one of a plurality of PRACH slots in the first period.

[0105] In one embodiment, the plurality of random access channel occasion groups mentioned above is in the first period. In other words, the plurality of candidate synchronization signal block indices being mapped to the plurality of random access channel occasion groups in the first mapping order is realized in the first period.

[0106] In one embodiment, the first period includes a plurality of random access channel occasions.

[0107] In one embodiment, any random access channel occasion in the plurality of random access channel occasion groups is one of the plurality of random access channel occasions included in the first period. Alternatively, one or more of the various Petition 870250075078, dated 08 / 25 / 2025, page 38 / 183 30 / 74 random access channel occasions included in the first period may constitute any group of random access channel occasions in the plurality of groups of random access channel occasions.

[0108] In one embodiment, the plurality of candidate synchronization signal block indices being mapped to a plurality of random access channel occasion groups in a first-order mapping may refer to the fact that the plurality of candidate synchronization signal block indices is mapped to the plurality of random access channel occasion groups in the first period in the first-order mapping.

[0109] In one embodiment, the plurality of candidate synchronization signal block indices being mapped to a plurality of random access channel occasion groups in a first-order mapping may refer to the fact that the plurality of candidate synchronization signal block indices is mapped to the plurality of random access channel occasions in the first period in the first-order mapping.

[0110] In one embodiment, any candidate synchronization signal block index in the plurality of candidate synchronization signal block indices can be mapped to at least one group of random access channel occasions in the first period.

[0111] In one embodiment, any candidate synchronization signal block index in the plurality of candidate synchronization signal block indices can be mapped to at least one random access channel occasion in the first period.

[0112] In one embodiment, mapping the plurality of candidate synchronization signal block indices to the plurality of random access channel occasion groups is performed in the first period. Petition 870250075078, dated 08 / 25 / 2025, page 39 / 183 31 / 74

[0113] In one embodiment, the first period may refer to a PRACH setting period.

[0114] In one embodiment, the first period may refer to an association period in which the plurality of candidate synchronization signal block indices is mapped to the plurality of random access channel occasion groups.

[0115] In one embodiment, the first period may refer to a pattern of association period including one or more association periods.

[0116] In one embodiment, the first period for mapping the plurality of candidate synchronization signal block indices to the plurality of random access channel occasion groups is a minimum value in a set determined based on the PRACH configuration period.

[0117] In one embodiment, for the set determined based on the PRACH configuration period, one can refer to Table 1, i.e., a value for the first period can be determined from Table 1. Table 1 PRACH setup period (msec) First period (number of PRACH setup periods) 10 {1,2, 4, 8, 16} 20 {1,2, 4, 8} 40 {1, 2, 4} 80 {1,2} 160 {1}

[0118] In one embodiment, the first period may begin in frame number 0.

[0119] As described above, the index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first channel occasion group. Petition 870250075078, dated 08 / 25 / 2025, page 40 / 183 32 / 74 random access. The first type of occasion group and the first mapping order are described below, respectively.

[0120] The first type of occasion group may include one or more types of the following information: a first repeat factor, a first frequency jump indication, and a first frequency jump pattern.

[0121] In one embodiment, the first type of occasion group may include one type of the preceding information, for example, include only the first repeating factor, or include only the first frequency jump indication, or include only the first frequency jump pattern.

[0122] In one embodiment, the first type of occasion group may include several types of the preceding information, for example, include the first repeating factor and the first frequency jump indication; or include the first repeating factor and the first frequency jump pattern; or include the first repeating factor, the first frequency jump indication and the first frequency jump pattern; or the like.

[0123] In one embodiment, the first type of occasion group may include other information in addition to one or more types of the preceding information, which are not limited to the embodiments of the present application.

[0124] In one embodiment, the first type of occasion group may include the first repetition factor, and the quantity of all random access channel occasions included in the first group of random access channel occasions is equal to the value of the first repetition factor. For example, if the value of the first repetition factor is 4, the quantity of random access channel occasions included in the first group of random access channel occasions will be 4. In other words, the first group of random access channel occasions includes four random access channel occasions.

[0125] In one embodiment, the value of the first factor of Petition 870250075078, dated 08 / 25 / 2025, page 41 / 183 33 / 74 repetition is a positive integer. For example, the value of the first repetition factor can be any positive integer, such as 2, 4, 8, or 16.

[0126] In one embodiment, the value of the first repetition factor is predefined in a configured protocol or network.

[0127] In one embodiment, the value of the first repeating factor can be one of 2 and 4.

[0128] In one embodiment, the value of the first repeating factor can be one of 2, 4, and 8.

[0129] In one embodiment, the value of the first repeating factor can be one of 1, 2, 4, and 8.

[0130] In one embodiment, the values ​​of a plurality of repeating factors are not equal.

[0131] In one embodiment, the first repetition factor is one among a plurality of repetition factors. The plurality of repetition factors may refer to repetition factors of multiple PRACH transmissions, i.e., a number of repetition times of PRACH transmissions.

[0132] In one embodiment, the values ​​of the plurality of repeating factors may include at least 2 and 4. For example, the values ​​of the plurality of repeating factors may include only 2 and 4; or the values ​​of the plurality of repeating factors may include 2, 4, and other positive integers.

[0133] In one embodiment, the values ​​of the plurality of repeating factors may include 2, 4, and 8.

[0134] In one embodiment, the values ​​of the plurality of repeating factors may include 1, 2, and 4.

[0135] In one embodiment, the values ​​of the plurality of repeating factors may include 1, 2, 4, and 8. Petition 870250075078, dated 08 / 25 / 2025, page 42 / 183 34 / 74

[0136] In one embodiment, the values ​​of the plurality of repeating factors can be 2 and 4, respectively.

[0137] In one embodiment, the values ​​of the plurality of repeating factors can be 2, 4 and 8, respectively.

[0138] In one embodiment, the values ​​of the plurality of repeating factors can be 1, 2 and 4, respectively.

[0139] In one embodiment, the values ​​of the plurality of repeating factors can be 1, 2, 4 and 8, respectively.

[0140] In one embodiment, the quantity of all random access channel occasions included in any group of random access channel occasions in the plurality of groups of random access channel occasions is equal to one of the plurality of repetition factors. For example, the values ​​of the plurality of repetition factors are 2 and 4, respectively. Any group of random access channel occasions in the plurality of groups of random access channel occasions includes two or four random access channel occasions.

[0141] In one embodiment, the plurality of candidate occasion group types may include a first candidate occasion group type and a second candidate occasion group type, and the first candidate occasion group type is different from the second candidate occasion group type.

[0142] In one embodiment, the first type of candidate occasion group being different from the second type of candidate occasion group may include that: a repetition factor included in the first type of candidate occasion group is different from a repetition factor included in the second type of candidate occasion group.

[0143] In one embodiment, when the first type of occasion group belongs to different types of candidate occasion groups, Petition 870250075078, dated 08 / 25 / 2025, page 43 / 183 35 / 74 The values ​​of the first repetition factor included in the first type of occasion group are different. For example, when the first type of occasion group is the first candidate type of occasion group, the value of the first repetition factor is one of the values ​​in the plurality of repetition factors; when the first type of occasion group is the second candidate type of occasion group, the value of the first repetition factor is a value of a repetition factor, in the plurality of repetition factors, different from the repetition factor included in the first candidate type of occasion group. As a specific example, when the first type of occasion group is the first candidate type of occasion group, the value of the first repetition factor might be 2; when the first type of occasion group is the second candidate type of occasion group, the value of the first repetition factor might be 4.

[0144] In one embodiment, any random access channel occasion group in the plurality of random access channel occasion groups corresponds to one of the plurality of candidate occasion group types. For example, the plurality of random access channel occasion groups includes four random access channel occasion groups A, B, C, and D, and the candidate occasion group type includes a first candidate occasion group type and a second candidate occasion group type, where random access channel occasion groups A and random access channel occasion groups B may correspond to the first candidate occasion group type, and random access channel occasion groups C and random access channel occasion groups D may correspond to the second candidate occasion group type.

[0145] In one embodiment, the plurality of candidate occasion group types includes, respectively, the plurality of repetition factors. For example, the plurality of repetition factors includes 2 and 4, the first candidate occasion group type in the plurality of group types. Petition 870250075078, dated 08 / 25 / 2025, page 44 / 183 36 / 74 of candidate occasions may include a repetition factor of 2, and the second type of candidate occasion group may include a repetition factor of 4.

[0146] In one embodiment, the quantity of all random access channel occasions included in a second group of random access channel occasions is equal to the value of a repetition factor included in a candidate occasion group type corresponding to the second group of random access channel occasions, and the second group of random access channel occasions is any group of random access channel occasions in the plurality of groups of random access channel occasions.For example, if the candidate occasion group type corresponding to the second random access channel occasion group is the first candidate occasion group type, and the first candidate occasion group type includes a repetition factor with a value of 2, the number of random access channel occasions included in the second random access channel occasion group will be equal to 2; If the candidate occasion group type corresponding to the second random access channel occasion group is the second candidate occasion group type, and the second candidate occasion group type includes a repetition factor with a value of 4, the number of random access channel occasions included in the second random access channel occasion group will be equal to 4.

[0147] In one embodiment, the plurality of candidate occasion group types includes, respectively, the plurality of repetition factors, and the quantity of all random access channel occasions included in any random access channel occasion group in the plurality of random access channel occasion groups is equal to the value of a repetition factor in the plurality of repetition factors. For example, the quantity of all random access channel occasions included in any random access channel occasion group in the plurality of Petition 870250075078, dated 08 / 25 / 2025, page 45 / 183 37 / 74 groups of random access channel occasions can be equal to one of the following: 1, 2, 4, and 8.

[0148] In one embodiment, the first type of occasion group may include a first frequency hopping indication. The first frequency hopping indication can be used to determine whether frequency domain resources occupied by at least two random access channel occasions in the first random access channel occasion group are different. In other words, the first frequency hopping indication can be used to determine whether frequency domain resources occupied by at least two random access channel occasions in the first random access channel occasion group are the same.

[0149] In one embodiment, the plurality of candidate occasion group types may include a first candidate occasion group type and a second candidate occasion group type, and the first candidate occasion group type is different from the second candidate occasion group type.

[0150] In one embodiment, the first type of candidate occasion group being different from the second type of candidate occasion group may include that: a frequency jump indication included in the first type of candidate occasion group is different from a frequency jump indication included in the second type of candidate occasion group.

[0151] In one embodiment, when the first type of occasion group belongs to different types of candidate occasion groups, the frequency hopping indication included in the first type of occasion group indicates different information. For example, when the first type of occasion group is the first type of candidate occasion group, the first frequency hopping indication can be used to indicate that the frequency domain resources occupied by all random access channel occasions in Petition 870250075078, dated 08 / 25 / 2025, page 46 / 183 38 / 74 first group of random access channel occasions are the same; When the first type of occasion group is the second candidate type of occasion group, the first frequency hopping indication can be used to indicate that the frequency domain resources occupied by at least two random access channel occasions in the first group of random access channel occasions are different.

[0152] In one embodiment, the first type of occasion group may include a first frequency hopping pattern. The first frequency hopping pattern is used to determine a frequency domain resource occupied by any random access channel occasion in the first random access channel occasion group.

[0153] In one embodiment, the frequency domain resource occupied by any random access channel occasion in the first group of random access channel occasions corresponds to the first frequency hopping pattern.

[0154] In one embodiment, the plurality of candidate occasion group types may include a first candidate occasion group type and a second candidate occasion group type, and the first candidate occasion group type is different from the second candidate occasion group type.

[0155] In one embodiment, the first type of candidate occasion group being different from the second type of candidate occasion group may include: a frequency hopping pattern included in the first type of candidate occasion group is different from a frequency hopping pattern included in the second type of candidate occasion group.

[0156] In one embodiment, when the first type of occasion group belongs to different types of candidate occasion groups, the patterns of the first frequency jump pattern included in the first type Petition 870250075078, dated 08 / 25 / 2025, page 47 / 183 39 / 74 of occasion groups are different. For example, when the first occasion group type belongs to the first candidate occasion group type, the first frequency hopping pattern included in the first occasion group type is frequency hopping pattern A; when the first occasion group type belongs to the second candidate occasion group type, the first frequency hopping pattern included in the first occasion group type is frequency hopping pattern B, where frequency hopping pattern A is at least partially different from frequency hopping pattern B.

[0157] In one embodiment, the plurality of candidate occasion group types may include a plurality of frequency hopping patterns. A frequency domain feature occupied by any random access channel occasion groups in the plurality of random access channel occasion groups corresponds to a frequency hopping pattern in the plurality of frequency hopping patterns.

[0158] In one embodiment, any random access channel occasion group in the plurality of random access channel occasion groups corresponds to one of a plurality of candidate occasion group types. The plurality of candidate occasion group types includes a plurality of frequency hopping patterns, and a frequency domain feature occupied by any random access channel occasion group in the plurality of random access channel occasion groups corresponds to a frequency hopping pattern in the plurality of frequency hopping patterns.

[0159] In one embodiment, the first type of occasion group is one among a plurality of candidate occasion group types and, therefore, the plurality of candidate occasion group types may include one or more of the following: a repetition factor, an indication Petition 870250075078, dated 08 / 25 / 2025, page 48 / 183 40 / 74 frequency hopping and a frequency hopping pattern. The specific content of the information included in the plurality of candidate occasion group types is similar to the information included in the first occasion group type, and for a specific description, see the description of the information included in the first occasion group type. For brevity, the details are not described here again.

[0160] In embodiments of the present application, a plurality of random access channel occasions are grouped into a plurality of random access channel occasion groups using a plurality of candidate occasion group types (e.g., a plurality of repetition factors), such that the number of random access channel occasions occupied by multiple PRACH transmissions is variable.

[0161] The first mapping order is described in detail below.

[0162] In one embodiment, the first order of mapping is associated with one or more of the following: a preamble index within a group of random access channel occasions, frequency domain features of a plurality of groups of random access channel occasions, and time domain features of a plurality of groups of random access channel occasions.

[0163] In one embodiment, the first mapping order may include: in an order of variation of preamble indices within a group of random access channel occasions in a plurality of groups of random access channel occasions, for example, in an ascending order of preamble indices or in a descending order of preamble indices. In other words, a plurality of candidate synchronization signal block indices may be arranged in an order of variation. Petition 870250075078, dated 08 / 25 / 2025, page 49 / 183 41 / 74 (as an ascending order) of preamble indices within a group of random access channel occasions in the plurality of random access channel occasion groups.

[0164] In one embodiment, the first mapping order may include: in an order of variation of frequency domain features of the plurality of random access channel occasion groups, for example, in an ascending order of frequency domain features or in a descending order of frequency domain features. In other words, a plurality of candidate synchronization signal block indices may be arranged in an order of variation (such as an ascending order) of frequency domain features of the plurality of random access channel occasion groups to multiple frequency multiplexed random access channel occasion groups.

[0165] In one embodiment, the first mapping order may include: in an order of variation of the time-domain features of the plurality of random access channel occasion groups, for example, in an ascending order of time-domain features or in a descending order of time-domain features. In other words, a plurality of candidate synchronization signal block indices may be arranged in an order of variation (such as an ascending order) of the time-domain features of the plurality of random access channel occasion groups to multiple time-multiplexed random access channel occasion groups.

[0166] In one embodiment, the first mapping order may include one or more of the following orders: an increasing order of preamble indices within a random access channel occasion group in the plurality of random access channel occasion groups; an increasing order of frequency domain features to the Petition 870250075078, dated 08 / 25 / 2025, page 50 / 183 42 / 74 plurality of random access channel occasion groups; and an increasing order of time domain features for the plurality of random access channel occasion groups.

[0167] In one embodiment, the first order of mapping may include: first, in ascending order of preamble indices within a group of random access channel occasions in the plurality of groups of random access channel occasions; second, in ascending order of frequency domain features to the plurality of groups of random access channel occasions; and third, in ascending order of time domain features to the plurality of groups of random access channel occasions.

[0168] However, the embodiments of the present application are not limited to this; the preceding orders included in the first mapping order may be randomly arranged and combined, and a sequence of the preceding orders may also be altered. For example, the first mapping order may include: first, in ascending order of preamble indices within a group of random access channel occasions in a plurality of groups of random access channel occasions; second, in ascending order of time domain features for a plurality of groups of random access channel occasions; and third, in ascending order of frequency domain features for a plurality of groups of random access channel occasions, and so forth.

[0169] In one embodiment, the plurality of random access channel occasion groups may include a plurality of random access channel occasions, and each random access channel occasion in the plurality of random access channel occasions included in the plurality of random access channel occasion groups may belong to only one Petition 870250075078, dated 08 / 25 / 2025, page 51 / 183 43 / 74 random access channel occasion group in the plurality of random access channel occasion groups. In other words, the plurality of random access channel occasion groups does not repeat, that is, the resources (e.g., random access channel occasions) occupied by the plurality of random access channel occasion groups do not overlap.

[0170] An example in which each random access channel occasion in the plurality of random access channel occasions belongs to only one group of random access channel occasions is provided below, with reference to Figure 4.

[0171] As shown in Figure 4, it is assumed that a plurality of repetition factors included in a plurality of candidate occasion group types are 1, 2, and 4, respectively, where 4 is a maximum repetition factor Qmax, or a maximum repetition factor Qmax for multiple PRACH transmissions is 4. As an implementation, in a first period, all random access channel occasions within the first period can be classified into a plurality of random access channel occasion groups sequentially according to a plurality of repetition factors included in the plurality of candidate occasion group types.

[0172] In the example illustrated in Figure 4, all random access channel occasions in the first period are classified into a plurality of random access channel occasion groups sequentially in descending order of the plurality of repetition factors included in the plurality of candidate occasion group types.

[0173] In the example illustrated in Figure 4, each dashed box represents a group of random access channel occasions, and the groups of random access channel occasions are obtained sequentially by means of Petition 870250075078, dated 08 / 25 / 2025, page 52 / 183 44 / 74 ranking in descending order of the plurality of repetition factors (1, 2 and 4).

[0174] In the example illustrated in Figure 4. The plurality of random access channel occasion groups includes a plurality of random access channel occasions. Any random access channel occasion included in the plurality of random access channel occasion groups belongs to only one random access channel occasion group. For example, a random access channel occasion (1) (RO 1 in the figure) belongs to only one random access channel (ROG 1 in the figure), and a random access channel occasion (8) (RO 8 in the figure) belongs to only one random access channel (ROG 2 in the figure), and so on.

[0175] In the example illustrated in Figure 4, the plurality of random access channel occasion groups includes a plurality of random access channel occasions. For each random access channel occasion included in the plurality of random access channel occasion groups, different candidate synchronization signal block indices are mapped to different preambles in a plurality of preambles included in each random access channel occasion. For example, a random access channel occasion (1) is used as an example, and both a candidate synchronization signal block index 0 and a candidate synchronization signal block index 1 are mapped to the random access channel occasion (1), but the candidate synchronization signal block index 0 and the candidate synchronization signal block index 1 are mapped to different preambles in the random access channel occasion (1).For example, candidate synchronization signal block index 0 is mapped to preambles (0-21) on random access channel occasion (1), and candidate synchronization signal block index 1 is mapped to preambles (2243) on random access channel occasion (1). Petition 870250075078, dated 08 / 25 / 2025, page 53 / 183 45 / 74

[0176] In one embodiment, the plurality of random access channel occasion groups may include a plurality of random access channel occasions, and each random access channel occasion in the plurality of random access channel occasions included in the plurality of random access channel occasion groups may be shared by at least two random access channel occasion groups in the plurality of random access channel occasion groups. In other words, resources (e.g., random access channel occasions) occupied by the plurality of random access channel occasion groups may overlap.

[0177] An example in which each random access channel occasion in the plurality of random access channel occasions is shared by at least two groups of random access channel occasions in the plurality of groups of random access channel occasions is provided below, with reference to Figure 5.

[0178] As shown in Figure 5, it is assumed that a plurality of repetition factors included in a plurality of candidate occasion group types are 1, 2, and 4, respectively, where 4 is a maximum repetition factor Qmax, or a maximum repetition factor Qmax for multiple PRACH transmissions is 4. As an implementation, in a first period, all random access channel occasions within the first period can be classified into a plurality of random access channel occasion groups according to a plurality of repetition factors included in the plurality of candidate occasion group types.

[0179] In the example illustrated in Figure 5, all random access channel occasions in the first period are classified into a plurality of random access channel occasion groups, according to the plurality of repetition factors included in the plurality of group types. Petition 870250075078, dated 08 / 25 / 2025, page 54 / 183 46 / 74 of the candidates' occasions.

[0180] In the example illustrated in Figure 5, each dashed box represents a group of random access channel occasions, and the groups of random access channel occasions are obtained by sorting according to the plurality of repetition factors (1, 2, and 4). A dashed elliptical box and a dashed square box represent, respectively, a group of random access channel occasions obtained by sorting according to different repetition factors. For example, a dashed elliptical box represents a group of random access channel occasions obtained by sorting according to a repetition factor of 4, and a dashed square box represents a group of random access channel occasions obtained by sorting according to a repetition factor of 2.

[0181] In the example illustrated in Figure 5, the plurality of random access channel occasion groups includes a plurality of random access channel occasions. Any random access channel occasion included in the plurality of random access channel occasion groups is shared by at least two random access channel occasion groups in the plurality of random access channel occasion groups. For example, a random access channel occasion (1) (RO 1 in the figure) is shared by two random access channel occasion groups (ROG 1 and ROG 7 in the figure), and a random access channel occasion (8) (RO 8 in the figure) is shared by two random access channel occasion groups (ROG 2 and ROG 8 in the figure), and so on.

[0182] In the example illustrated in Figure 5, the plurality of random access channel occasion groups includes a plurality of random access channel occasions. For each random access channel occasion included in the plurality of random access channel occasion groups, by Petition 870250075078, dated 08 / 25 / 2025, page 55 / 183 47 / 74 minus two groups of random access channel occasions that share the random access channel occasion are mapped to different preambles in the plurality of preambles included in the random access channel occasion. For example, a random access channel occasion (1) is used as an example, a group of random access channel occasions (1) and a group of random access channel occasions (7) share the random access channel occasion (1) and both are mapped to the random access channel occasion (1). However, the group of random access channel occasions (1) and the group of random access channel occasions (7) are mapped to different preambles in the random access channel occasion (1).For example, the random access channel occasion group (1) is mapped to preambles (0-21) in random access channel occasion (1), and the random access channel occasion group (7) is mapped to preambles (22-43) in random access channel occasion (1).

[0183] Figure 6 illustrates another example where each random access channel occasion in the plurality of random access channel occasions is shared by at least two groups of random access channel occasions in the plurality of groups of random access channel occasions. The solution illustrated in Figure 6 can be understood as a combination (or mixture) of the implementations illustrated in Figure 4 and Figure 5.

[0184] As shown in Figure 6, it is assumed that a plurality of repetition factors included in a plurality of candidate occasion group types are 1, 2, and 4, respectively, where 4 is a maximum repetition factor Qmax; in other words, a maximum repetition factor Qmax for multiple PRACH transmissions is 4. As an implementation, in a first period, all random access channel occasions within the first period can be classified into a plurality of random access channel occasion groups sequentially according to a Petition 870250075078, dated 08 / 25 / 2025, page 56 / 183 48 / 74 plurality of repetition factors included in the plurality of candidate occasion group types (i.e., being first sorted into a plurality of random access channel occasion groups according to the implementation illustrated in Figure 4). Then, in the plurality of random access channel occasion groups, for a random access channel occasion group in which preambles are not used, an additional sorting is performed on the random access channel occasion group in which preambles are not used. The candidate occasion group types (e.g., repetition factors) corresponding to the two sorting times are different. For example, the additional sorting can be performed according to the implementation illustrated in Figure 5.

[0185] In the example illustrated in Figure 6, each dashed box represents a group of random access channel occasions, where the dashed elliptical boxes represent a plurality of random access channel occasion groups obtained first by sequential sorting according to a plurality of repetition factors included in the plurality of candidate occasion group types, and the dashed square boxes represent random access channel occasion groups obtained by further sorting for random access channel occasion groups in which the preambles are not exhausted.

[0186] In the example illustrated in Figure 6, the plurality of random access channel occasion groups includes a plurality of random access channel occasions. Any random access channel occasion included in the plurality of random access channel occasion groups may belong to only one random access channel occasion group or may be shared by at least two random access channel occasion groups in the plurality of random access channel occasion groups. For example, a random access channel occasion (1) (RO 1 in the figure) belongs Petition 870250075078, dated 08 / 25 / 2025, page 57 / 183 49 / 74 only to the random access channel occasion group (1) (ROG 1 in the figure), and a random access channel occasion (13) (RO 13 in the figure) is shared by two random access channel occasion groups (ROG 4 and ROG 12 in the figure), and so on.

[0187] In the example illustrated in Figure 6, the plurality of random access channel occasion groups includes a plurality of random access channel occasions. For each random access channel occasion included in the plurality of random access channel occasion groups, if the random access channel occasion belongs to only one random access channel occasion group, different candidate synchronization signal block indices can be mapped to different preambles in a plurality of preambles included in each random access channel occasion.For example, a random access channel occasion (1) is used as an example, and both a candidate synchronization signal block index 0 and a candidate synchronization signal block index 1 are mapped to the random access channel occasion (1), but the candidate synchronization signal block index 0 and the candidate synchronization signal block index 1 are mapped to different preambles in the random access channel occasion (1). For example, the candidate synchronization signal block index 0 is mapped to preambles (0-21) in the random access channel occasion (1), and the candidate synchronization signal block index 1 is mapped to preambles (22-43) in the random access channel occasion (1).If the random access channel occasion is shared by at least two groups of random access channel occasions, the at least two groups of random access channel occasions that share the random access channel occasion can be mapped to different preambles in the plurality of preambles included in the random access channel occasion. For example, a random access channel occasion (13) is used. Petition 870250075078, dated 08 / 25 / 2025, page 58 / 183 50 / 74 as an example, a random access channel occasion group (4) and a random access channel occasion group (12) share the random access channel occasion (13) and both are mapped to the random access channel occasion (13). However, the random access channel occasion group (4) and the random access channel occasion group (12) are mapped to different preambles in the random access channel occasion (13). For example, the random access channel occasion group (4) is mapped to preambles (0-21) in the random access channel occasion (13), and the random access channel occasion group (12) is mapped to preambles (22-43) in the random access channel occasion (13).

[0188] Figure 7 is a schematic flowchart of a method for a node used for wireless communication according to another embodiment of the present application. The method illustrated in Figure 7 may include Steps (S710) to (S730).

[0189] In Step (S710), a first node receives a first block of synchronization signal.

[0190] In Step (S720), the first node transmits a first group of preambles.

[0191] For related descriptions of Steps (S710) and (S720), see previous descriptions of Steps (S310) and (S320), and details are not described here.

[0192] In Step (S730), the first node receives a first random access response in a first time window in response to the transmission of the first group of preambles.

[0193] In one embodiment, a first group of random access channel occasions can be used to determine one or more of the following: determine the start of the first time window and determine a shuffling sequence of the first random access response. Petition 870250075078, dated 08 / 25 / 2025, page 59 / 183 51 / 74

[0194] In one particular embodiment, the first group of random access channel occasions is used to determine the start of the first time window.

[0195] In another specific embodiment, the first group of random access channel occasions is used to determine the start of the first time window and the shuffling sequence of the first random access response.

[0196] The embodiments of the methods of the present application are described in detail above with reference to Figures 1 to 7. The embodiments of the apparatus of the present application are described in detail below with reference to Figures 8 to 10. It should be understood that the description of the embodiments of the methods corresponds to the description of the embodiments of the apparatus and, therefore, for the parts that are not described in detail, reference may be made to the embodiments of the previous methods.

[0197] Figure 8 is a schematic structural diagram of a first node according to an embodiment of the present application. A first node (800) shown in Figure 8 may include a first receiver set (810) and a first transmitter set (820).

[0198] The first receiver set (810) can be configured to receive a first synchronization signal block, where an index of the first synchronization signal block is one among a plurality of candidate synchronization signal block indices.

[0199] The first transmitter set (820) can be configured to transmit a first group of preambles, where the first group of preambles includes a plurality of preambles. A first group of random access channel occasions includes a plurality of random access channel occasions, and the plurality of random access channel occasions Petition 870250075078, dated 08 / 25 / 2025, page 60 / 183 52 / 74 random in the first group of random access channel occasions is used to transmit the plurality of preambles in the first group of preambles. Any two random access channel occasions in the first group of random access channel occasions are orthogonal in the time domain. The plurality of candidate synchronization signal block indices is mapped to a plurality of random access channel occasion groups according to a first-order mapping, and the first group of random access channel occasions is one among the plurality of random access channel occasion groups. The first group of random access channel occasions corresponds to a first type of occasion group, and the first type of occasion group is one among a plurality of candidate occasion group types.The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[0200] In one embodiment, any group of random access channel occasions in the plurality of groups of random access channel occasions is in a first period.

[0201] In one embodiment, the first type of occasion group includes a first repetition factor, the number of random access channel occasions included in the first group of random access channel occasions is equal to a value of the first repetition factor, and the first repetition factor is one among a plurality of repetition factors.

[0202] In one embodiment, any random access channel occasion group in the plurality of random access channel occasion groups corresponds to one of the plurality of candidate occasion group types. The plurality of candidate occasion group types includes, respectively, the plurality of repetition factors, and a quantity Petition 870250075078, dated 08 / 25 / 2025, page 61 / 183 53 / 74 of random access channel occasions included in a second group of random access channel occasions is equal to a repetition factor value included in a candidate occasion group type corresponding to the second group of random access channel occasions. The second group of random access channel occasions is any group of random access channel occasions in the plurality of random access channel occasion groups.

[0203] In one embodiment, the first type of occasion group includes a first frequency hopping indication; and the first frequency hopping indication is used to determine whether frequency domain resources occupied by at least two random access channel occasions in the first random access channel occasion group are different.

[0204] In one embodiment, the first type of occasion group includes a first frequency hopping pattern; and a frequency domain resource occupied by any random access channel occasion in the first random access channel occasion group corresponds to the first frequency hopping pattern.

[0205] In one embodiment, the index of the first synchronization signal block, the first occasion group type, and the first mapping order used to determine the first random access channel occasion group include: the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups correspond, respectively, to at least two different candidate occasion group types, and the first occasion group type is used to determine the first random access channel occasion group from the at least two occasion groups of Petition 870250075078, dated 08 / 25 / 2025, page 62 / 183 54 / 74 random access channel.

[0206] In one embodiment, the index of the first synchronization signal block, the first occasion group type, and the first mapping order used to determine the first random access channel occasion group include: the first occasion group type is used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel occasion group from the at least L random access channel occasion groups, where L is a positive integer greater than 1.

[0207] In one embodiment, the first order of mapping includes one or more of the following orders: an increasing order of preamble indices within a group of random access channel occasions in a plurality of random access channel occasion groups; an increasing order of frequency domain features for a plurality of random access channel occasion groups; and an increasing order of time domain features for a plurality of random access channel occasion groups.

[0208] In one embodiment, the first order of mapping includes: first, in ascending order of preamble indices within a group of random access channel occasions in a plurality of groups of random access channel occasions; second, in ascending order of frequency domain features to a plurality of groups of random access channel occasions; and third, in ascending order of time domain features to a plurality of groups of random access channel occasions.

[0209] In one form of realization, the plurality of groups of Petition 870250075078, dated 08 / 25 / 2025, page 63 / 183 55 / 74 random access channel occasions includes a plurality of random access channel occasions, and each random access channel occasion in the plurality of random access channel occasions included in the plurality of random access channel occasion groups belongs to only one random access channel occasion group in the plurality of random access channel occasion groups; or said each random access channel occasion is shared by at least two random access channel occasion groups in the plurality of random access channel occasion groups.

[0210] In one embodiment, at least two random access channel occasions in at least one group of random access channel occasions in the plurality of groups of random access channel occasions are in two different slots.

[0211] In one embodiment, the first node (800) further includes: a second receiver set, configured to receive a first random access response in a first time window in response to the transmission of the first group of preambles. The first group of random access channel occasions is used to determine the start of the first time window; and the first group of random access channel occasions is used to determine a shuffling sequence for the first random access response.

[0212] In one embodiment, the first receiver set (810) and the first transmitter set (820) can be a transceiver (1030). The first node (800) can further include a processor (1010) and a memory (1020), as shown in Figure 10.

[0213] Figure 9 is a schematic structural diagram of a second node, according to an embodiment of the present application. A second node (900) shown in Figure 9 may include a first transmitter assembly (910) and a first receiver assembly (920). Petition 870250075078, dated 08 / 25 / 2025, page 64 / 183 56 / 74

[0214] The first transmitter set (910) can be configured to transmit one or more synchronization signal blocks, where a first synchronization signal block is one of one or more synchronization signal blocks, and an index of the first synchronization signal block is one among a plurality of candidate synchronization signal block indices.

[0215] The first receiver set (920) can be configured to receive a first group of preambles, where the first group of preambles includes a plurality of preambles. A first group of random access channel occasions includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first group of random access channel occasions is used to transmit the plurality of preambles in the first group of preambles. Any two random access channel occasions in the first group of random access channel occasions are orthogonal in the time domain. The plurality of candidate synchronization signal block indices is mapped to a plurality of random access channel occasion groups according to a first-order mapping, and the first group of random access channel occasions is one among the plurality of random access channel occasion groups.The first random access channel occasion group corresponds to a first occasion group type, and the first occasion group type is one among a plurality of candidate occasion group types. The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[0216] In one embodiment, any group of random access channel occasions in the plurality of groups of random access channel occasions is in a first period. Petition 870250075078, dated 08 / 25 / 2025, page 65 / 183 57 / 74

[0217] In one embodiment, the first type of occasion group includes a first repetition factor, the number of random access channel occasions included in the first group of random access channel occasions is equal to a value of the first repetition factor, and the first repetition factor is one among a plurality of repetition factors.

[0218] In one embodiment, any group of random access channel occasions in the plurality of random access channel occasion groups corresponds to one of the plurality of candidate occasion group types. The plurality of candidate occasion group types includes, respectively, the plurality of repetition factors, and a quantity of random access channel occasions included in a second random access channel occasion group is equal to a value of a repetition factor included in a candidate occasion group type corresponding to the second random access channel occasion group. The second random access channel occasion group is any group of random access channel occasions in the plurality of random access channel occasion groups.

[0219] In one embodiment, the first type of occasion group includes a first frequency hopping indication; and the first frequency hopping indication is used to determine whether frequency domain resources occupied by at least two random access channel occasions in the first random access channel occasion group are different.

[0220] In one embodiment, the first type of occasion group includes a first frequency hopping pattern; and a frequency domain feature occupied by any random access channel occasion in the first random access channel occasion group corresponds to the first frequency hopping pattern.

[0221] In one embodiment, the index of the first block of Petition 870250075078, dated 08 / 25 / 2025, page 66 / 183 58 / 74 synchronization signal, the first type of occasion group and the first mapping order used to determine the first random access channel occasion group include: the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups correspond, respectively, to at least two different candidate occasion group types, and the first occasion group type is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

[0222] In one embodiment, the index of the first synchronization signal block, the first occasion group type, and the first mapping order used to determine the first random access channel occasion group include: the first occasion group type is used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel occasion group from the at least L random access channel occasion groups, where L is a positive integer greater than 1.

[0223] In one embodiment, the first mapping order includes one or more of the following orders: an increasing order of preamble indices within a group of random access channel occasions in a plurality of random access channel occasion groups; an increasing order of frequency domain features for a plurality of random access channel occasion groups; and an increasing order of time domain features for a plurality of random access channel occasion groups. Petition 870250075078, dated 08 / 25 / 2025, page 67 / 183 59 / 74 random access.

[0224] In one embodiment, the first order of mapping includes: first, in ascending order of preamble indices within a group of random access channel occasions in the plurality of groups of random access channel occasions; second, in ascending order of frequency domain features for the plurality of groups of random access channel occasions; and third, in ascending order of time domain features for the plurality of groups of random access channel occasions.

[0225] In one embodiment, the plurality of random access channel occasion groups includes a plurality of random access channel occasions, and each random access channel occasion in the plurality of random access channel occasions included in the plurality of random access channel occasion groups belongs to only one random access channel occasion group in the plurality of random access channel occasion groups; or said each random access channel occasion is shared by at least two random access channel occasion groups in the plurality of random access channel occasion groups.

[0226] In one embodiment, at least two random access channel occasions in at least one group of random access channel occasions in the plurality of groups of random access channel occasions are in two different slots.

[0227] In one embodiment, the second node (900) includes: a second transmitter set, configured to transmit a first random access response in a first time window in response to receiving the first group of preambles. The first group of random access channel occasions is used to determine the start of the first time window; and the first group of random access channel occasions is used to Petition 870250075078, dated 08 / 25 / 2025, page 68 / 183 60 / 74 determine a shuffling sequence for the first random access response.

[0228] In one embodiment, the first transmitter set (910) and the first receiver set (920) can be a transceiver (1030). The second node (900) can further include a processor (1010) and a memory (1020), as shown in Figure 10.

[0229] Figure 10 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application. The dashed lines in Figure 10 indicate that the unit or module is optional. The apparatus (1000) can be configured to implement the methods described in previous method embodiments. The apparatus (1000) can be a chip, a UE, or a network device.

[0230] The apparatus (1000) may include one or more processors (1010). The processor (1010) may enable the apparatus (1000) to implement the methods described in the preceding method embodiments. The processor (1010) may be a general-purpose processor or a dedicated processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may 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, a discrete gate logic device or transistor, a discrete hardware component, or similar. The general-purpose processor may be a microprocessor or any conventional or similar processor.

[0231] The device (1000) may also include one or more memories (1030). The memory (1030) stores a program that can be executed by the processor (1010) to make the processor (1010) execute the methods described in the previous method embodiments. The memory Petition 870250075078, dated 08 / 25 / 2025, p. 69 / 183 61 / 74 (1030) can be independent of the processor (1010) or it can be integrated into the processor (1010).

[0232] The device (1000) may also include a transceiver (1030). The processor (1010) may communicate with another device or chip by means of the transceiver (1030). For example, the processor (1010) may transmit and receive data to and from another device or chip by means of the transceiver (1030).

[0233] To facilitate understanding, the hardware modules of the communication devices of the first and second nodes are briefly described below.

[0234] Referring to Figure 11, Figure 11 is a schematic diagram of the hardware modules of a communications device according to an embodiment of the present application. Specifically, Figure 11 is a block diagram of a first communications device (450) and a second communications device (410) communicating with each other on an access network.

[0235] The first communications device (450) includes a controller / processor (459), a memory (460), a data source (467), a transmission processor (468), a reception processor (456), a multi-antenna transmission processor (457), a multi-antenna reception processor (458), transmitters / receivers (454) and antennas (452).

[0236] The second communications device (410) includes a controller / processor (475), a memory (476), a data source (477), a receiving processor (470), a transmitting processor (416), a multi-antenna receiving processor (472), a multi-antenna transmitting processor (471), transmitters / receivers (418) and antennas (420).

[0237] In the transmission from the second communications device (410) to the first communications device (450), in the second communications device (410), a data packet from the upper layer of a network Petition 870250075078, dated 08 / 25 / 2025, page 70 / 183 62 / 74 central or a data packet from the upper layer of the data source (477) is provided to the controller / processor (475). The central network and the data source (477) represent all protocol layers above an L2 layer. The controller / processor (475) implements L2 layer functions. In transmission from the second communications device (410) to the first communications device (450), the controller / processor (475) provides header compression, encryption, packet segmentation and reordering, multiplexing between a logical channel and a transport channel, and allocation to the radio resources of the first communications device (450) based on various priority measurements. The controller / processor (475) is also responsible for retransmitting a lost packet and for signaling to the first communications device (450).The transmission processor (416) and the multi-antenna transmission processor (471) implement various signal processing functions of an L1 layer (i.e., a physical layer). The transmission processor (416) implements encoding and interleaving to facilitate forward error correction in the second communications device (410) and signal cluster mapping based on various modulation schemes (such as binary phase-shift keying, quadrature phase-shift keying, M-phase-shift keying, and M-quadrature amplitude modulation). The multi-antenna transmission processor (471) performs digital spatial pre-coding, including codebook-based pre-coding and non-codebook-based pre-coding, on an encoded and modulated symbol, and performs beamforming processing to generate one or more spatial streams.The transmission processor (416) then maps each spatial stream to a subcarrier, multiplexes the mapped spatial stream with a reference signal (e.g., a pilot) in the time domain and / or frequency domain, and then uses an inverse fast Fourier transform to generate a. Petition 870250075078, dated 08 / 25 / 2025, page 71 / 183 63 / 74 physical channel carrying a multicarrier symbol stream in the time domain. Subsequently, the multiantenna transmission processor (471) performs an analog pre-coding transmission / beamforming operation on the multicarrier symbol stream in the time domain. Each transmitter (418) converts a baseband multicarrier symbol stream provided by the multiantenna transmission processor (471) into a radio frequency stream and then provides the radio frequency stream to different antennas (420).

[0238] In the transmission from the second communications device (410) to the first communications device (450), in the first communications device (450), each receiver (454) receives a signal through its corresponding antenna (452). Each receiver (454) retrieves information modulated on a radio frequency carrier, converts a radio frequency stream into a baseband multicarrier symbol stream, and provides the baseband multicarrier symbol stream to the receiving processor (456). The receiving processor (456) and the multiantenna receiving processor (458) implement various L1 layer signal processing functions. The multiantenna receiving processor (458) performs an analog pre-coding receive / beamforming operation on the baseband multicarrier symbol stream from the receiver (454).The receiving processor (456) converts, from the time domain to the frequency domain, by means of the fast Fourier transform, the multi-carrier baseband symbol stream obtained after the analog pre-coding receive / beamforming operation. In the frequency domain, a physical layer data signal and a reference signal are demultiplexed by the receiving processor (456). The reference signal is used for channel estimation; and the data signal is recovered after multi-antenna detection performed by the multi-antenna receiving processor (458), to obtain any stream. Petition 870250075078, dated 08 / 25 / 2025, page 72 / 183 64 / 74 spatial streams using the first communications device (450) as the destination. The symbols in each spatial stream are demodulated and recovered in the receiving processor (456), and a soft decision is generated. The receiving processor (456) then decodes and deinterleaves the soft decision to recover the upper-layer data and a control signal transmitted by the second communications device (410) on a physical channel. The upper-layer data and the control signal are then provided to the controller / processor (459). The controller / processor (459) implements L2 layer functions. The controller / processor (459) can be associated with memory (460) that stores program codes and data. The memory (460) can be called a computer-readable storage medium.In the transmission from the second communications device (410) to the first communications device (450), the controller / processor (459) provides demultiplexing between a transport channel and a logical channel, packet reassembly, decryption, header decompression, and control signal processing, to retrieve a data packet from the upper layer of the second communications device (410). The upper layer packet is then provided to all protocol layers above layer L2, or various control signals may be provided to layer L3 for processing by layer L3.

[0239] In the transmission from the first communications device (450) to the second communications device (410), in the first communications device (450), a data packet from the upper layer is provided to the controller / processor (459) using the data source (467). The data source (467) represents all protocol layers above layer L2. Similarly to the transmission function in the second communications device (410) described in the transmission from the second communications device (410) to the first communications device (450), the controller / processor Petition 870250075078, dated 08 / 25 / 2025, p. 73 / 183 65 / 74 (459) implements header compression, encryption, packet segmentation and reordering, and multiplexing between a logical channel and a transport channel, to implement L2 layer functions for a user plane and a control plane. The controller / processor (459) is also responsible for retransmitting a lost packet and signaling to the second communications device (410). The transmission processor (468) performs modulation and mapping, and channel coding processing. The multi-antenna transmission processor (457) performs multi-antenna digital spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing.Next, the transmission processor (468) modulates a generated spatial stream into a multi-carrier / single-carrier symbol stream, and the multi-carrier / single-carrier symbol stream is provided to different antennas (452) via the transmitter (454) after undergoing an analog pre-coding / beamforming operation in the multi-antenna transmission processor (457). Each transmitter (454) first converts a baseband symbol stream provided by the multi-antenna transmission processor (457) into a radio frequency symbol stream and then provides the radio frequency symbol stream to the antennas (452).

[0240] In the transmission from the first communications device (450) to the second communications device (410), a function in the second communications device (410) is similar to the reception function in the first communications device (450) described in the transmission from the second communications device (410) to the first communications device (450). Each receiver (418) receives a radio frequency signal through its corresponding antenna (420), converts the received radio frequency signal into a baseband signal, and provides the baseband signal to the multi-antenna receiving processor (472) and the receiving processor (470). Petition 870250075078, dated 08 / 25 / 2025, page 74 / 183 66 / 74 The receiving processor (470) and the multi-antenna receiving processor (472) jointly implement L1 layer functions. The controller / processor (475) implements L2 layer functions. The controller / processor (475) can be associated with the memory (476) that stores program codes and data. The memory (476) can be called a computer-readable storage medium. In the transmission from the first communications device (450) to the second communications device (410), the controller / processor (475) provides demultiplexing between a transport channel and a logical channel, packet reassembly, decryption, header decompression, and control signal processing, to recover a data packet from the upper layer of the first communications device (450).The data packet from the upper layer of the controller / processor (475) can be provided to a central network or to all protocol layers above layer L2, or multiple control signals can be provided to the central network or to layer L3 for processing by layer L3.

[0241] In one embodiment, the first communications device (450) includes: at least one processor and at least one memory. The at least one memory includes computer program code. The at least one memory and the computer program code are configured to be used in conjunction with the at least one processor. The first communications device (450) is configured to at least: receive a first synchronization signal block, wherein an index of the first synchronization signal block is one among a plurality of candidate synchronization signal block indices; and transmit a first group of preambles, wherein the first group of preambles includes a plurality of preambles. A first group of random access channel occasions includes a plurality of random access channel occasions, and the Petition 870250075078, dated 08 / 25 / 2025, page 75 / 183 The plurality of random access channel occasions in the first group of random access channel occasions is used to transmit the plurality of preambles in the first group of preambles. Any two random access channel occasions in the first group of random access channel occasions are orthogonal in the time domain. The plurality of candidate synchronization signal block indices is mapped to a plurality of random access channel occasion groups according to a first-order mapping, and the first group of random access channel occasions is one among the plurality of random access channel occasion groups. The first group of random access channel occasions corresponds to a first type of occasion group, and the first type of occasion group is one among a plurality of candidate occasion group types.The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[0242] In one embodiment, the first communications device (450) includes: a memory for storing a computer-readable instruction program, wherein the computer-readable instruction program generates actions when executed by at least one processor, and the actions include: receiving a first synchronization signal block, wherein an index of the first synchronization signal block is one among a plurality of candidate synchronization signal block indices; and transmitting a first group of preambles, wherein the first group of preambles includes a plurality of preambles. A first group of random access channel occasions includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first group of random access channel occasions is used to transmit the plurality of preambles in the first group of preambles. Any two occasions of Petition 870250075078, dated 08 / 25 / 2025, page 76 / 183 68 / 74 random access channels in the first group of random access channel occasions are orthogonal in the time domain. The plurality of candidate synchronization signal block indices is mapped to a plurality of random access channel occasion groups according to a first mapping order, and the first random access channel occasion group is one among the plurality of random access channel occasion groups. The first random access channel occasion group corresponds to a first occasion group type, and the first occasion group type is one among a plurality of candidate occasion group types. The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[0243] In one embodiment, the first communications device (450) corresponds to the first node in the present application.

[0244] In one embodiment, the second communications device (410) corresponds to the second node in the present application.

[0245] In one embodiment, the first communications device (450) is a UE.

[0246] In one embodiment, the first communications device (450) is a UE that supports V2X.

[0247] In one embodiment, the first communications device (450) is a UE that supports D2D.

[0248] In one embodiment, the first communications device (450) is a network-controlled repeater.

[0249] In one embodiment, the first communications device (450) is a relay.

[0250] In one embodiment, the second device of communications (410) is a base station. Petition 870250075078, dated 08 / 25 / 2025, page 77 / 183 69 / 74

[0251] In one embodiment, the antenna (452), the receiver (454), the multi-antenna receiving processor (458), the receiving processor (456) and the controller / processor (459) are configured to receive the first synchronization signal block in the present application.

[0252] In one embodiment, the antenna (420), the transmitter (418), the multi-antenna transmission processor (471), the transmission processor (416) and the controller / processor (475) are configured to transmit one or more synchronization signal blocks in the present application, and the first synchronization signal block is one of one or more synchronization signal blocks.

[0253] In one embodiment, the antenna (452), the transmitter (454), the multi-antenna transmission processor (457), the transmission processor (468) and the controller / processor (459) are configured to transmit the first group of preambles in the present application.

[0254] In one embodiment, the antenna (420), the receiver (418), the multi-antenna receiving processor (472), the receiving processor (470) and the controller / processor (475) are configured to receive the first group of preambles in the present application.

[0255] One embodiment of the present application further provides a computer-readable storage medium for storing a program. The computer-readable storage medium may be applied to the terminal or network device provided in embodiments of the present application, and the program causes a computer to execute the methods to be executed by the terminal or network device in various embodiments of the present application.

[0256] One embodiment of the present application further provides a computer program product. The computer program product includes a program. The computer program product can be applied Petition 870250075078, dated 08 / 25 / 2025, p. 78 / 183 70 / 74 to the terminal or network device provided in the embodiments of this application, and the program causes a computer to execute the methods to be executed by the terminal or network device in various embodiments of this application.

[0257] One embodiment of this application further provides a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of this application, and the computer program causes a computer to execute the methods to be executed by the terminal or network device in various embodiments of this application.

[0258] It should be understood that the terms “system” and “network” in this application may be used interchangeably. Furthermore, the terms used in this application are intended only to explain specific embodiments of this application and are not intended to limit this application. It should be noted that the terms “first,” “second,” “third,” “fourth,” and similar terms, present in the descriptive report, claims, and drawings of this application, are used to distinguish between different objects and not to describe a specific order. In addition, the terms “include” and “have,” and any variations thereof, are intended to encompass a non-exclusive inclusion.

[0259] In the embodiments of this request, “indicate” as used herein may refer to a direct indication, or it may refer to an indirect indication, or it may mean that there is a relationship of association. For example, A indicates B, which may mean that A indicates B directly, as, for example, B can be obtained through A; or it may mean that A indicates B indirectly, as, for example, A indicates C, and B can be obtained through C; or it may mean that there is a relationship of association between A and B.

[0260] In the ways of carrying out this request, “B that Petition 870250075078, dated 08 / 25 / 2025, p. 79 / 183 "71 / 74 corresponds to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B based solely on A, but rather that B can be determined based on A and / or other information.

[0261] In the embodiments of the present request, the term “correspondent” may mean that there is a direct or indirect correspondence between the two, or it may mean that there is a relationship of association between the two, or it may mean that there is a relationship such as indicating and being indicated, or configuring and being configured.

[0262] In embodiments of the present application, “default” or “pre-configured” may be implemented by pre-storing corresponding codes, tables, or other formats that can be used to indicate related information in devices (for example, including a UE and a network device), and a specific implementation thereof is not limited in the present application. For example, “default” may refer to something defined in a protocol.

[0263] In embodiments of the present application, the “protocol” may refer to a standard protocol in the field of communications and may include, for example, an LTE protocol, an NR protocol and a related protocol applied to a future communications system, which is not limited in the present application.

[0264] In embodiments of the present application, the term “and / or” is merely an association relation describing associated objects and represents the possibility of three relations. For example, A and / or B may represent three cases: only A exists, A and B exist, and only B exists. Furthermore, the character “ / ” here generally indicates an “or” relation between the associated objects.

[0265] In the forms of carrying out the present request, the numbers Petition 870250075078, dated 08 / 25 / 2025, page 80 / 183 The sequence of processes mentioned in items 72 / 74 does not imply execution sequences. The execution sequences of the processes must be determined according to the functions and internal logic of the processes and should not be interpreted as any limitation to the implementation processes of the methods of carrying out this application.

[0266] In the various embodiments provided in this application, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the embodiments of the apparatus described are merely illustrative. For example, the division of units is merely a division of logical function and may be another division in the actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some functionalities may be omitted or not performed. Furthermore, the mutual, direct, or communication couplings presented or discussed may be implemented using some interfaces. Indirect or communication couplings between the apparatus or units may be implemented in electronic, mechanical, or other forms.

[0267] The units described as separate components may or may not be physically separate, and the components presented as units may or may not be physical units, i.e., they may be located in a single location or distributed across a plurality of network units. Some or all of the units may be selected according to the actual need to achieve the objectives of the embodiment solutions.

[0268] Furthermore, the functional units in the embodiments of the present application may be integrated into a processing unit, or each of the units may exist physically in isolation, or two or more units may be integrated into a unit.

[0269] All or some of the previous embodiments Petition 870250075078, dated 08 / 25 / 2025, page 81 / 183 73 / 74 can be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement embodiments, the foregoing embodiments may be implemented wholly or partially 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 procedures or functions according to the embodiments of this application are wholly or partially generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable device. The computer instructions may be stored on a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired network (such as a coaxial cable, fiber optic cable, and a digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, and microwave). The computer-readable storage medium can be any usable, computer-readable medium, or a data storage device, such as a server or data center, integrating one or more usable storage media. The usable medium can be a magnetic medium (e.g., a floppy disk, a hard disk, or magnetic tape), an optical medium (e.g., a digital versatile disc (DVD)), a semiconductor medium (e.g., a solid-state drive (SSD)), or similar.

[0270] The descriptions above are merely specific implementations of the present application, but the scope of protection of the present application is not limited to them. Any variation or substitution easily understood by a person skilled in the art, within the technical scope disclosed herein, may be applied. Petition 870250075078, dated 08 / 25 / 2025, page 82 / 183 74 / 74 application, will be covered by the scope of protection of this application. Therefore, the scope of protection of this application will be subject to the scope of protection of the claims. Petition 870250075078, dated 08 / 25 / 2025, page 83 / 183

Claims

1 / 10 Claims 1. FIRST NODE (800) FOR WIRELESS COMMUNICATION, characterized by comprising: at least one processor (1010); one or more computer-readable non-transient storage media coupled to the at least one processor (1010) and storing programming instructions for execution by the at least one processor (1010), wherein the programming instructions, when executed, cause the first node (800) to perform operations comprising: - receiving (S310, S710) a first synchronization signal block / physical transmission channel block (SS / PBCH), wherein an index of the first SS / PBCH block is one among a plurality of candidate SS / PBCH block indices; - transmitting a first group of preambles (S320, S720), wherein the first group of preambles comprises a plurality of preambles;A first group of random access physical channel occasions (PRACH) comprises a plurality of PRACH occasions, and the plurality of PRACH occasions in the first group of PRACH occasions is configured to transmit the plurality of preambles in the first group of preambles; and any two PRACH occasions in the first group of PRACH occasions are orthogonal in the time domain, wherein the plurality of preambles is associated with a random access response, wherein - the plurality of candidate SS / PBCH block indices is mapped to a plurality of PRACH occasion groups in a first-order mapping, and the first group of PRACH occasions is one among the plurality of PRACH occasion groups;The first group of PRACH occasions corresponds to a first occasion group parameter, and the first occasion group parameter is one among a plurality of candidate occasion group parameters; wherein the first occasion group parameter indicates at least one of a number of PRACH occasions comprised in the first PRACH occasion group or a feature pattern in the first PRACH occasion group, and the index of the first SS / PBCH block, the first occasion group parameter, and the first mapping order are used to determine the first PRACH occasion group; and - receive (S730) the random access response associated with the plurality of preambles.

2. FIRST NODE (800), according to claim 1, characterized in that each of the plurality of PRACH occasion groups comprises a plurality of PRACH occasions; each of the plurality of PRACH occasions comprised in the first group of PRACH occasions is valid; preamble indices of preambles corresponding to each PRACH occasion in the first group of PRACH occasions are the same; and the plurality of preambles in the first group of preambles is transmitted using the same spatial filter.

3. FIRST NODE (800), according to claim 1, characterized by the mapping of the plurality of SS / PBCH candidate block indices to the plurality of PRACH occasion groups being carried out in a first period; the first period starting at frame number 0; the first period being a pattern association period that includes one or more association periods.

4. FIRST NODE (800), according to claim 1, characterized in that the first occasion group parameter comprises a first repetition factor that is equal to the number of PRACH occasions comprised in the first PRACH occasion group, the first repetition factor being one among a plurality of repetition factors, and the plurality of repetition factors comprising two, four and eight.

5. FIRST NODE (800), according to claim 4, characterized in that each group of PRACH occasions in the plurality of groups of PRACH occasions corresponds to one of the plurality of candidate occasion group parameters; the plurality of candidate occasion group parameters comprises, respectively, the plurality of repetition factors, and a quantity of PRACH occasions comprised in a second group of PRACH occasions is equal to a second repetition factor, the second repetition factor being one of the plurality of repetition factors corresponding to the second group of PRACH occasions, wherein the second group of PRACH occasions is a group of PRACH occasions in the plurality of groups of PRACH occasions.

6. FIRST NODE (800), according to claim 1, characterized in that the first occasion group parameter comprises a first frequency hopping indication; and the first frequency hopping indication is used to determine whether frequency resources occupied by at least two PRACH occasions in the first PRACH occasion group are different; or in that the first occasion group parameter comprises a first frequency hopping pattern; and a frequency resource occupied by each PRACH occasion in the first PRACH occasion group corresponds to the first frequency hopping pattern.

7. FIRST NODE (800), according to claim 1, characterized by the index of the first SS / PBCH block, the first occasion group parameter and the first mapping order being used to determine the first PRACH occasion group comprising that: the index of the first SS / PBCH block is mapped to at least two PRACH occasion groups from the plurality of PRACH occasion groups in the first mapping order, the at least two PRACH occasion groups correspond, respectively, to at least two from the plurality of candidate occasion group parameters, and the first occasion group parameter is used to determine the first PRACH occasion group from the at least two PRACH occasion groups.

8. FIRST NODE (800), according to claim 1, characterized by the index of the first SS / PBCH block, the first occasion group parameter and the first mapping order being used to determine the first PRACH occasion group comprising that: the first occasion group parameter is a first repeating factor, the first repeating factor is one among a plurality of repeating factors; the index of the first SS / PBCH block is mapped to at least two PRACH occasion groups from the plurality of PRACH occasion groups in the first mapping order, the at least two PRACH occasion groups correspond respectively to at least two of the plurality of repeating factors, and the first repeating factor is used to determine the first PRACH occasion group from the at least two PRACH occasion groups.

9. FIRST NODE (800), according to claim 1, characterized by the index of the first SS / PBCH block, the first occasion group parameter and the first mapping order being used to determine the first PRACH occasion group comprising that: the first occasion group parameter is used to determine at least L PRACH occasion groups from the plurality of PRACH occasion groups, and the index of the first SS / PBCH block and the first mapping order are used to determine the first PRACH occasion group from the at least L PRACH occasion groups, wherein L is a positive integer greater than 1.

10. FIRST NODE (800), according to claim 1, characterized by the index of the first SS / PBCH block, the first occasion group parameter and the first mapping order being used to determine the first PRACH occasion group comprising that: the first occasion group parameter is a first repetition factor; the first repetition factor is used to determine at least L PRACH occasion groups from the plurality of PRACH occasion groups, and the index of the first SS / PBCH block and the first mapping order are used to determine the first PRACH occasion group from the at least L PRACH occasion groups, wherein L is a positive integer greater than 1.

11. FIRST NODE (800), according to claim 1, characterized in that the first mapping order comprises one or more of the following orders: an increasing order of preamble indices within a group of PRACH occasions in the plurality of groups of PRACH occasions; an increasing order of frequency feature indices for the plurality of groups of PRACH occasions; or an increasing order of time feature indices for the plurality of groups of PRACH occasions.

12. FIRST NODE (800), according to claim 11, characterized by the first order of mapping comprising: first, in an increasing order of preamble indices within a group of PRACH occasions in the plurality of groups of PRACH occasions; second, in an increasing order of frequency feature indices for the plurality of groups of PRACH occasions; and third, in an increasing order of time feature indices for the plurality of groups of PRACH occasions. Petition 870250075078, dated 25 / 08 / 2025, p. 88 / 183 6 / 10 13. FIRST NODE (800), according to claim 1, characterized in that the plurality of PRACH occasion groups comprise a plurality of PRACH occasions; each of the plurality of PRACH occasions comprised in the plurality of PRACH occasion groups belongs to only one of the plurality of PRACH occasion groups; or each of the plurality of PRACH occasions is shared by at least two of the plurality of PRACH occasion groups.

14. FIRST NODE (800), according to claim 1, characterized in that at least two PRACH occasions in at least one of the plurality of PRACH occasion groups are in two different slots.

15. FIRST NODE (800), according to claim 1, characterized in that the operations comprise receiving a first random access response in a first time window in response to the transmission of the first group of preambles, wherein the first group of PRACH occasions is used to determine the start of the first time window; and the first group of PRACH occasions is used to determine a shuffling sequence for the first random access response.

16. SECOND NODE (900) FOR WIRELESS COMMUNICATION, characterized by comprising: at least one processor (1010); one or more non-transient computer-readable storage media coupled to at least one processor (1010) and storing programming instructions for execution by at least one processor (1010), wherein the programming instructions, when executed, cause the second node (900) to perform operations comprising: Petition 870250075078, dated 08 / 25 / 2025, page 89 / 183 7 / 10 - transmitting one or more SS / PBCH blocks, including a first SS / PBCH block, and an index of the first SS / PBCH block is one among a plurality of candidate SS / PBCH block indices; - receive a first group of preambles from a first node (800), where the first group of preambles comprises a plurality of preambles;A first group of PRACH occasions comprises a plurality of PRACH occasions, and the plurality of PRACH occasions in the first group of PRACH occasions is configured to convey the plurality of preambles in the first group of preambles; and any two PRACH occasions in the first group of PRACH occasions are orthogonal in the time domain, wherein the plurality of preambles is associated with a random access response, wherein - the plurality of candidate SS / PBCH block indices is mapped to a plurality of groups of PRACH occasions in a first-order mapping, and the first group of PRACH occasions is one among the plurality of groups of PRACH occasions; the first group of PRACH occasions corresponds to a first occasion group parameter, and the first occasion group parameter is one among a plurality of candidate occasion group parameters;where the first occasion group parameter indicates at least one of a number of PRACH occasions included in the first PRACH occasion group or a feature pattern in the first PRACH occasion group, and the index of the first SS / PBCH block, the first occasion group parameter, and the first mapping order are used to determine the first PRACH occasion group; and - transmit the random access response associated with the plurality of preambles.

17. SECOND NODE (900), according to claim 16, Petition 870250075078, dated 25 / 08 / 2025, p. 90 / 183 8 / 10 characterized in that each of the plurality of PRACH occasion groups comprises a plurality of PRACH occasions; each of the plurality of PRACH occasions comprised in the first group of PRACH occasions is valid; preamble indices of preambles corresponding to each PRACH occasion in the first group of PRACH occasions are the same; and the plurality of preambles in the first group of preambles is transmitted using the same spatial filter.

18. SECOND NODE (900), according to claim 16, characterized by the mapping of the plurality of SS / PBCH candidate block indices to the plurality of PRACH occasion groups being carried out in a first period; the first period starting at frame number 0; the first period being a pattern association period that includes one or more association periods.

19. SECOND NODE (900), according to claim 16, characterized in that the first occasion group parameter comprises a first repetition factor, a number of PRACH occasions included in the first PRACH occasion group is equal to the first repetition factor, the first repetition factor is one among a plurality of repetition factors, and the plurality of repetition factors comprises two, four, and eight; or in that the first occasion group parameter comprises a first repetition factor, a number of PRACH occasions included in the first PRACH occasion group is equal to the first repetition factor, and the first repetition factor is one among a plurality of repetition factors and the plurality of repetition factors comprises two, four, and eight; and each PRACH occasion group in the plurality of PRACH occasion groups corresponds to one among the plurality of candidate occasion group parameters;The plurality of parameters of groups of Petition 870250075078, of 08 / 25 / 2025, page 91 / 183 9 / 10 occasions candidates comprises, respectively, the plurality of repetition factors, and a quantity of PRACH occasions included in a second group of PRACH occasions is equal to a second repetition factor, the second repetition factor is one among the plurality of repetition factors corresponding to the second group of PRACH occasions, where the second group of PRACH occasions is a group of PRACH occasions in the plurality of groups of PRACH occasions.

20. METHOD FOR A NODE USED IN WIRELESS COMMUNICATION, characterized by comprising: receiving a first SS / PBCH block, wherein an index of the first SS / PBCH block is one among a plurality of candidate SS / PBCH block indices; transmitting, through a first node (800), a first group of preambles, wherein the first group of preambles comprises a plurality of preambles; a first group of PRACH occasions comprises a plurality of PRACH occasions, and the plurality of PRACH occasions in the first group of PRACH occasions is configured to transmit the plurality of preambles in the first group of preambles;and any two PRACH occasions in the first group of PRACH occasions are orthogonal in the time domain, wherein the plurality of preambles is associated with a random access response, wherein the plurality of candidate SS / PBCH block indices is mapped to a plurality of PRACH occasion groups in a first-order mapping, and the first group of PRACH occasions is one among the plurality of PRACH occasion groups; the first group of PRACH occasions corresponds to a first occasion group parameter, and the first occasion group parameter is one among a plurality of candidate occasion group parameters;where the first occasion group parameter indicates at least one of a number of PRACH occasions included in the first PRACH occasion group or a feature pattern in the first PRACH occasion group, and the index of the first SS / PBCH block, the first occasion group parameter, and the first mapping order are used to determine the first PRACH occasion group; and receive the random access response associated with the plurality of preambles. Petition 870250075078, dated 08 / 25 / 2025, page 93 / 183;

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