Method and apparatus for a node used for wireless communication

Abstract

To provide a method and an apparatus for a node used for wireless communication.SOLUTION: The method includes receiving, by a first node, a first synchronization signal block. The index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes. The method also includes transmitting a first preamble group including a plurality of preambles. The first random access channel occasion group includes a plurality of random access channel occasions used to send a plurality of preambles, any two random access channel occasions in the first random access channel occasion group are orthogonal in time domain, and an index of the first synchronization signal block, a first occasion group type, and a first mapping order determine the first random access channel occasion group.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present application relates to the field of communications technologies, and more particularly to methods and apparatus for nodes used for wireless communications. [Background technology]

[0002] To enhance the coverage performance of random access, some communication systems, such as New Radio (NR) systems, are planning to introduce a scheme based on physical random access channel (PRACH) transmission using a preamble group. However, in PRACH transmission using a preamble group, a conventional method of mapping between synchronization signal blocks (also called synchronization signal / physical broadcast channel blocks, or SSBs or SS / PBCH blocks for short) and random access channel occasions (RACH occasions, or also called ROs, PRACH occasions, or PROs for short) used for wireless communication may result in multiple random access channel occasions overlapping in the time domain. This imposes higher requirements on system configuration, as well as increases system processing complexity and transmission power overhead. This may result in a relatively long time interval between multiple random access channel occasions, which may extend the access delay of the system, reduce the utilization efficiency of random access resources, or increase additional signaling overhead. Summary of the Invention [Means for solving the problem]

[0003] In this regard, embodiments of the present application aim to provide methods and apparatus for nodes used for wireless communication.Various aspects of the present application are described below.

[0004] According to a first aspect, a method for a first node used for wireless communication is provided, the method including: receiving a first synchronization signal block, the index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes (also referred to as SS / PBCH block indexes); and transmitting a first preamble group, the first preamble group including a plurality of preambles. The first random access channel occasion group (also referred to as PRACH occasion group) includes a plurality of random access channel occasions (also referred to as PRACH occasions), and the plurality of random access channel occasions in the first random access channel occasion group are used to transmit the plurality of preambles in the first preamble group. Any two random access channel occasions in the first random access channel occasion group are orthogonal in the time domain. A plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups in a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups, the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of the plurality of candidate occasion group types, and the first synchronization signal block index, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[0005] According to a second aspect, a method for a second node used for wireless communication is provided, the method including: transmitting 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 of a plurality of candidate synchronization signal block indexes; and receiving a first preamble group, where the first preamble group includes a plurality of preambles. The first random access channel occasion group includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first random access channel occasion group are used to transmit the plurality of preambles in the first preamble group. Any two random access channel occasions in the first random access channel occasion group are orthogonal in the time domain. The plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups in 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, and the first occasion group type is one of 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.

[0006] According to a third aspect, a first node used for wireless communication is provided, the first node including: a first receive set configured to receive a first synchronization signal block, where the index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes; and a first transmit set configured to transmit a first preamble group, where the first preamble group includes a plurality of preambles. The first random access channel occasion group includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first random access channel occasion group are used to transmit the plurality of preambles in the first preamble group. Any two random access channel occasions in the first random access channel occasion group are orthogonal in the time domain. The plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups in 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, and the first occasion group type is one of 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.

[0007] According to a fourth aspect, a second node used for wireless communication is provided, the second node including: a first transmission set configured to transmit one or more synchronization signal blocks, the first synchronization signal block being one of one or more synchronization signal blocks and an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; and a first reception set configured to receive a first preamble group, the first preamble group including a plurality of preambles. The first random access channel occasion group includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first random access channel occasion group are used to transmit the plurality of preambles in the first preamble group. Any two random access channel occasions in the first random access channel occasion group are orthogonal in the time domain. A plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups in a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups, the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of the plurality of candidate occasion group types, and the first synchronization signal block index, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[0008] According to a fifth aspect, there is provided a first node used for wireless communication, including a processor, a memory, and a communication interface, wherein the memory is configured to store one or more computer programs, and the processor is configured to invoke the computer programs in the memory to cause the first node to perform some or all of the steps of the method according to the first aspect.

[0009] According to a sixth aspect, there is provided a second node used for wireless communication, including a processor, a memory, and a communication interface, wherein the memory is configured to store one or more computer programs, and the processor is configured to invoke the computer programs in the memory to cause the second node to perform some or all of the steps of the method according to the second aspect.

[0010] According to a seventh aspect, an embodiment of the present application provides a communication system, the system including the first node and / or the second node described above. In another possible design, the system may further include another device that interacts with the first node or the second node in the solution provided in the embodiment of the present application.

[0011] According to an eighth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program that causes a first node or a second node to execute some or all of the steps of a method according to the above aspect.

[0012] According to a ninth aspect, an embodiment of the present application provides a computer program product. The computer program product includes a non-transitory computer-readable storage medium storing a computer program, the computer program being operable to cause a first node or a second node to perform some or all of the steps of the method according to the above aspect. In some implementations, the computer program product may be a software installation package.

[0013] According to a tenth aspect, an embodiment of the present application provides a chip, the chip including a memory and a processor, the processor may call and execute a computer program from the memory to perform some or all of the steps of the method according to the above aspect.

[0014] In an embodiment of the present application, the first node can determine a first random access channel occasion group corresponding to a first synchronization signal block based on the index of the first synchronization signal block, the first occasion group type, and the first mapping order, so that any two random access channel occasions in the determined first random access channel occasion group are orthogonal in the time domain, i.e., any two random access channel occasions in the first random access channel occasion group do not overlap in the time domain.

[0015] In an embodiment 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, the first occasion group type, and the first mapping order do not overlap in the time domain. In an embodiment of the present application, a method for mapping synchronization signal blocks and random access channel occasions 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 the requirements for system configuration may be reduced, system processing complexity may be reduced, and transmission power overhead may be reduced.

[0016] The method for mapping synchronization signal blocks and random access channel occasions provided in the embodiments of the present application helps ensure short time intervals between multiple random access channel occasions in a first random access channel occasion group, thereby reducing the access delay of the system.

[0017] In addition, the method for mapping synchronization signal blocks and random access channel occasions provided in the embodiments of the present application helps to improve the utilization efficiency of random access resources or helps to reduce signaling overhead. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is an exemplary diagram of a system architecture of a wireless communication system to which embodiments of the present application are applicable; [Figure 2] 1 is an exemplary diagram of a mapping relationship between synchronization signal blocks and random access channel occasions. [Figure 3] 1 is a schematic flowchart of a method used for wireless communication according to one embodiment of the present application. [Figure 4] FIG. 2 is an exemplary diagram of a mapping relationship between synchronization signal blocks and random access channel occasion groups according to an embodiment of the present application; [Figure 5] FIG. 10 is an exemplary diagram of a mapping relationship between synchronization signal blocks and random access channel occasion groups according to another embodiment of the present application; [Figure 6] FIG. 10 is an exemplary diagram of a mapping relationship between synchronization signal blocks and random access channel occasion groups according to yet another embodiment of the present application; [Figure 7] 4 is a schematic flowchart of a method used for wireless communication according to another embodiment of the present application. [Figure 8] FIG. 2 is a schematic structural diagram of a first node according to an embodiment of the present application; [Figure 9] FIG. 2 is a schematic structural diagram of a second node according to an embodiment of the present application; [Figure 10] 1 is a schematic structural diagram of a communication device according to an embodiment of the present application; [Figure 11] 1 is a schematic diagram of hardware modules of a communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0019] The following clearly and completely describes the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application.

[0020] Communication System Architecture 1 is an example diagram of a system architecture of a wireless communication system 100 to which embodiments of the present application can be applied. The wireless communication system 100 may include a network device 110 and user equipment (UE) 120. The network device 110 may be a device that communicates with the UE 120. The network device 110 may provide communication coverage for a particular geographic area and may communicate with the UE 120 located within the coverage.

[0021] 1 shows an example in which there is one network device and two UEs. Optionally, the wireless communication system 100 may include multiple network devices, and a different number of UEs may be included in the coverage of each network device, which is not limited in the embodiments of the present application.

[0022] Optionally, the wireless communication system 100 may further include other network entities, such as a network controller and a mobility management entity, which are not limited in the embodiments of the present application.

[0023] 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 may also be applied to beam failure 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 may also be applied to a Type 2 random access procedure. Furthermore, 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 may also be applied to a PC5 interface. Furthermore, although the technical solutions of the embodiments of the present application are described for single-carrier communication, the technical solutions of the embodiments of the present application may also be applied to multi-carrier communication. Furthermore, although the technical solutions of the embodiments of the present application are described for multi-antenna communication, the technical solutions of the embodiments of the present application may also be applied to single-antenna communication. Furthermore, although the technical solutions of the embodiments of the present application are described for a scenario of a UE and a base station, the technical solutions of the embodiments of the present application are also applicable to a vehicle-to-everything (V2X) scenario and a scenario in which a UE communicates with a relay and the relay communicates with a base station, achieving similar technical effects as those in the scenario of a UE and a base station. Furthermore, the technical solutions of the embodiments of the present application may be applied to various communication scenarios, such as an enhanced mobile broadband (eMBB) scenario, an ultra-reliable and low latency communication (URLLC) scenario, and a massive machine-type communication (mMTC) scenario. In addition, using a unified solution for different scenarios may also help reduce hardware complexity and cost.

[0024] It should be understood that, where there is no inconsistency, embodiments of the present application for a first node and features therein may also be applied to a second node, and vice versa. Where there is no inconsistency, embodiments of the present application and features therein may be combined with each other in any combination.

[0025] It should be understood that the technical solutions in the embodiments of the present application may be applied to various communication systems, such as a fifth generation (5G) system or a new radio (NR) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, and an LTE time division duplex (TDD) system. The technical solutions provided in the present application may also be applied to future communication systems, such as a sixth generation mobile communication system and a satellite communication system.

[0026] The UE in the embodiments of the present application may also be referred to as a terminal device, access terminal, subscriber unit, subscriber station, mobile, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user equipment. The UE in the embodiments of the present application may be a device capable of providing voice and / or data connectivity to a user and connecting people, objects, and machines, such as a handheld device or an in-vehicle device with wireless connectivity capabilities. The UE in the embodiments of the present application may be a mobile phone, a tablet computer (pad), a notebook computer, a palmtop computer, a mobile internet device (MID), a 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 smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the UE may be used to act as a base station. For example, a UE may act as a scheduling entity, providing sidelink signals between UEs, such as in V2X or device to device (D2D) communications. For example, a cellular phone and a vehicle may communicate with each other by using sidelink signals. A cellular phone and a smart home device may communicate with each other without relaying communication signals through a base station.

[0027] The network device in the embodiments of the present application may be a device for communicating with a 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 the present application may be a radio access network (RAN) node (or device) that allows a UE to access a wireless network. The base station may broadly cover various names below, or may be interchangeable with the following names, for example, Node B, evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmit and receive point (TRP), transmission point (TP), master eNB (MeNB), secondary eNB (SeNB), multi-standard radio (MSR) node, home base station, network controller, access node, radio node, access point (AP), transmit node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), and positioning node. The base station may be a macro base station, a micro base station, a relay node, a donor node, etc., or a combination thereof. Alternatively, the base station may be a communication module, a modem, or a chip disposed in the device or apparatus described above. Alternatively, the base station may be a mobile switching center, a device functioning as a base station in D2D, V2X, machine-to-machine (M2M) communications, a network-side device in a 6G network, a device functioning as a base station in a future communication system, etc. The base station may support networks of the same or different access technologies. The specific technology used by the network device and the specific device configuration are not limited in the embodiments of the present application.

[0028] The base station may be fixed or mobile. For example, a helicopter or a drone may be configured to act as a mobile base station, and one or more cells may move according to the location of the mobile base station. In another example, a helicopter or a drone may be configured to act as a device that communicates with another base station.

[0029] In some deployments, the network device in the embodiments of the present application may be a CU or a DU, or the network device may include a CU and a DU. The gNB may further include an AAU.

[0030] The network devices and UEs may be deployed on the ground, including indoors or outdoors, handheld or vehicle-mounted, or on water, or may be deployed in airplanes, balloons, and satellites in the air. In the embodiments of the present application, the scenarios where the network devices and UEs are located are not limited.

[0031] It should be understood that all or part of the functionality of the communication device in this application may also be implemented by software functions running on hardware or by virtualization functions instantiated on a platform (such as a cloud platform).

[0032] It should be understood that for the explanation of terms in the embodiments of the present application, reference may be made to the 3GPP (registered trademark) description protocols TS36 series, TS37 series, and TS38 series, and also to the Institute of Electrical and Electronics Engineers (IEEE) description protocols.

[0033] Preamble transmission coverage extension Because the coverage performance of a communication system directly affects the service quality of the communication system and the operator's costs, such as the operator's capital expenditure (CAPEX) and the operator's operating expense (OPEX), the coverage performance of a communication system (e.g., an NR system) is an important factor that needs to be considered when an operator commercially deploys a communication network.

[0034] The coverage performance of a communication system varies with the operating frequency band of the communication system. For example, compared with the LTE system, the operating frequency band of the NR system is higher (e.g., mmWave frequency band), which results in a larger path loss for the NR system, thereby resulting in a lower coverage performance for the NR system. Therefore, as the frequency band supported by the communication system may become higher and higher, how to extend the coverage of the communication system becomes a problem to be solved.

[0035] In most practical deployment scenarios, the capability of UE is lower than that of network devices, so the uplink coverage performance is the bottleneck of coverage extension in communication systems. With the development of communication technology, the uplink services in some emerging vertical use cases, for example, in video upload services, gradually increase, and in scenarios with many uplink services, how to extend the uplink coverage is a problem that needs to be further solved.

[0036] In the related art, there have been technical solutions for coverage extension for some uplinks. For example, in Release 17 (Rel-17) of NR, coverage extension solutions have been designed for the Physical Uplink Shared Channel (PUSCH), the Physical Uplink Control Channel (PUCCH), and Message 3 (Msg3) in the random access procedure.

[0037] However, although there is no coverage extension solution designed for PRACH in Rel-17, preamble transmission performance is crucial for many procedures, such as initial access and beam failure recovery procedures, and therefore, it is also crucial to perform coverage extension for PRACH. As such, Rel-18 officially establishes a work item (WI) called "Further NR Coverage Extensions," in which extending the coverage performance of preamble transmission is one of the key topics of the work item.

[0038] In a possible implementation, a preamble group transmission may be used for coverage extension of the preamble transmission, in other words, the coverage extension of the preamble transmission may be implemented through repeated preamble transmission (e.g., the preamble is sent multiple times in the PRACH).

[0039] In an embodiment of the present application, preamble group transmission may refer to preamble group transmission performed by using the same beam or may refer to preamble group transmission performed by using different beams. Preamble group transmission performed by using the same beam is used as an example, and in the Third Generation Partnership Project (3GPP) Radio Access Network (RAN) 1#110-bis-e meeting, it has been agreed that for preamble group transmission performed by using the same beam, PRACH occasions (also called RACH occasions) at different time instances may at least be used. In addition, in the RAN1#110-bis-e meeting, a repetition factor (quantity / number of preamble group transmissions) of preamble group transmissions performed by using the same beam is further specified, and the repetition factor may be at least one of 2, 4, and 8.

[0040] Mapping of associations between synchronization signal blocks and PRACH occasions The 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 broadcast channel (PBCH). In some embodiments, the synchronization signal block may be represented as a synchronization signal block (SSB), and in some embodiments, the synchronization signal block may also be represented as a synchronization signal / physical broadcast channel block (SS / PBCH block), that is, the synchronization signal block may also be referred to as a synchronization signal broadcast channel block, which is not limited in the embodiments of the present application. Please note that the following description uses an example in which the synchronization signal block is represented as an SSB, and indeed, SSB in the following description may be replaced with an SS / PBCH block.

[0041] An SSB is a group of resources transmitted on a basic orthogonal frequency division multiplexing grid, which may include, for example, one or more of the following resources: time domain resources, frequency resources, and code domain resources.

[0042] When a UE detects an SSB sent by a network device during the process of performing initial access or beam failure recovery, the UE may obtain the SSB index of the SSB, so that the time-domain location where the SSB is located may be known to perform downlink synchronization with the network device. To perform uplink synchronization, the UE needs to transmit a preamble to the network device. How the UE selects a preamble to be sent and on which PRACH occasion the selected preamble should be sent are both determined by the UE based on the received (or detected) SSB.

[0043] As a possible technical solution, an SSB may be associated with and mapped to at least one preamble in at least one PRACH occasion, so that when a UE performs initial access or beam failure recovery, the associated PRACH occasion and preamble may be determined based on the received SSB so that preamble transmission can continue to be performed.

[0044] In the related art, the association and mapping relationship between SSBs and PRACH occasions / preambles follows the following order: first, ascending order of preamble index within a single PRACH occasion; second, ascending order of frequency resource index for frequency-multiplexed PRACH occasions; third, ascending order of time-domain resource index for time-multiplexed PRACH occasions within a PRACH slot; and fourth, ascending order of index for PRACH slots.

[0045] An example of the association and mapping relationship between SSBs and PRACH occasions is provided below with reference to Figure 2. In the example of Figure 2, it is assumed that there are eight SSB beams, the SSB indices corresponding to the eight SSB beams are SSB0 to SSB7, the parameter SSB-perRACH-Occasion sent by the network device to the UE is 1 / 2, and 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 as shown in Figure 2, and each block in the figure represents one PRACH occasion.

[0046] As mentioned above, PRACH coverage extension may be performed by preamble group transmission. In a preamble group transmission scenario, when multiple PRACH occasions associated with an SSB are determined by using the above association and mapping relationship, multiple PRACH occasions associated with the same SSB may overlap in the time domain, thereby increasing the transmit power overhead of the device.

[0047] In addition, in the scenario of preamble group transmission performed by using the same beam, collisions also occur when multiple PRACH occasions associated with an SSB are determined by using the above association and mapping relationship, along with the time-domain orthogonal PRACH occasion scheme for preamble group transmission realized in the RAN1#110-bis-e association.

[0048] In conclusion, in a preamble group transmission scenario, how to determine multiple PRACH occasions associated with an SSB based on the SSB is a problem that needs to be solved.

[0049] To solve the above problems, embodiments of the present application provide methods and apparatus for nodes used for wireless communication that can effectively associate and map SSBs to multiple PRACH occasions that are orthogonal to each other in the time domain, thereby helping to reduce transmission power overhead.

[0050] The embodiments of the present application may be applied to a preamble group transmission scenario, ie, repeated transmission of multiple PRACHs may be used to implement PRACH coverage extension.

[0051] In some embodiments, the preamble group transmissions described in the embodiments of the present application may refer to preamble group transmissions performed by using the same beam, where repeated transmissions of multiple preambles are performed on the same beam to obtain a signal-to-noise ratio (SNR) gain. In some embodiments, the preamble group transmissions described in the embodiments of the present application may refer to preamble group transmissions performed by using different beams, where repeated transmissions of multiple preambles are performed on different beams to obtain a diversity gain.

[0052] It should be noted that the beams described in the embodiments of the present application may be replaced by other terms, such as antenna ports, spatial filters, and spatial parameters, and the meanings expressed by the terms may be consistent. No distinction is made between the terms in the embodiments of the present application.

[0053] The embodiments of the present application may be applied to an initial access procedure or a beam failure recovery procedure. The initial access procedure is used as an example, and the embodiments of the present application may be applied to a four-step random access procedure (i.e., a Type 1 random access procedure) or a two-step random access procedure (i.e., a Type 2 random access procedure), which is not limited in the embodiments of the present application.

[0054] The method embodiments of the present application are described in detail below with reference to the drawings. Figure 3 is a schematic flowchart of a method for a node used for wireless communication according to one embodiment of the present application. The method shown in Figure 3 is introduced from the perspective of interaction between a first node and a second node.

[0055] In one embodiment, the first node may be a network-controlled repeater (NCR).

[0056] In one embodiment, the first node may be a UE, for example, UE 120 shown in FIG.

[0057] In one embodiment, the first node may be a relay, such as a relay terminal.

[0058] In one embodiment, the second node may be a network device, for example, network device 110 shown in FIG.

[0059] The method shown in FIG. 3 may include step S310 and step S320, which are introduced below.

[0060] In step S310, the first node receives the first synchronization signal block.

[0061] The index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes.

[0062] In one embodiment, the first synchronization signal block may be one of one or more synchronization signal blocks sent by the second node.

[0063] In one embodiment, the synchronization signal block (e.g., the 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 in the embodiments of the present application.

[0064] In one embodiment, the index of the first synchronization signal block is mapped to a first random access channel occasion group, the first random access channel occasion group including a plurality of random access channel occasions.

[0065] In one embodiment, the multiple random access channel occasions included in the first random access channel occasion group may be represented as RACH occasions (RO: RACH occasions) or PRACH occasions (PRO: PRACH occasions), which is not limited in the embodiments of the present application.

[0066] In step S320, the first node transmits a first preamble group. The first preamble group includes a plurality of preambles. In some embodiments, the preamble may be referred to as a preamble code, which is not limited in the embodiments of the present application.

[0067] Multiple random access channel occasions in the first random access channel occasion group are used to transmit multiple preambles in the first preamble group, in other words, multiple preambles in the first preamble group may be transmitted on multiple random access channel occasions in the first random access channel occasion group, e.g., each preamble is transmitted on a random access channel occasion.

[0068] Any two random access channel occasions in the first random access channel occasion group are orthogonal in the time domain, and therefore any two random access channel occasions in the first random access channel occasion group do not overlap in the time domain, i.e., the random access channel occasions to which the first synchronization signal block is associated and mapped do not overlap in the time domain.

[0069] In one embodiment, any random access channel occasion in the first random access channel occasion group is valid. For example, for paired spectrum or the supplemental uplink band, all random access channel occasions may be valid. Alternatively, for unpaired spectrum, a random access channel occasion may be valid if certain conditions are met, which may be related to, for example, the parameter tdd-UL-DL-ConfigurationCommon.

[0070] In one embodiment, the above-described multiple candidate synchronization signal block indexes may be mapped to multiple random access channel occasion groups in a first mapping order, and the first random access channel occasion group is one of the multiple random access channel occasion groups. How the multiple candidate synchronization signal block indexes are mapped to multiple random access channel occasion groups in the first mapping order will be described in detail below and will not be described in detail herein.

[0071] In one embodiment, any random access channel occasion group among the plurality of random access channel occasion groups includes at least one random access channel occasion, and the plurality of random access channel occasion groups including a first random access channel occasion group is used as an example, and the first random access channel occasion group may include at least one random access channel occasion.

[0072] In one embodiment, any random access channel occasion group among the plurality of random access channel occasion groups includes multiple (two or more) random access channel occasions, for example, a first random access channel occasion group may include multiple random access channel occasions.

[0073] In one embodiment, any two random access channel occasions included in any random access channel occasion group in the plurality of random access channel occasion groups are orthogonal in the time domain.

[0074] In one embodiment, any two random access channel occasions being orthogonal in the time domain may be understood as any two random access channel occasions being distributed at different time instances, and in some embodiments, the time instance may alternatively be replaced with another term such as a time interval, which is not limited in the embodiments of the present application.

[0075] In one embodiment, any random access channel occasion group among the multiple random access channel occasion groups is valid. For example, for paired spectrum or the supplemental uplink band, all random access channel occasion groups may be valid. Alternatively, for unpaired spectrum, a random access channel occasion group may be valid if certain conditions are met, which may be related to, for example, the parameter tdd-UL-DL-ConfigurationCommon.

[0076] In one embodiment, one or more random access channel occasions included in any random access channel occasion group among the plurality of random access channel occasion groups are valid.

[0077] In one embodiment, at least two random access channel occasions in at least one random access channel occasion group in the plurality of random access channel occasion groups are in two different slots, for example, the first time period includes three random access channel slots (PRACH slots), and one or more random access channel occasion groups in the plurality of random access channel occasion groups may occupy two or three of the three PRACH slots.

[0078] In one embodiment, all random access channel occasions included in any random access channel occasion group among the plurality of random access channel occasion groups are in the same slot, i.e., all random access channel occasions included in any random access channel occasion group among the plurality of random access channel occasion groups are in the same PRACH slot.

[0079] In one embodiment, any random access channel occasion group among the multiple random access channel occasion groups may include multiple preambles. Thus, after determining the random access channel occasion group (which may be any random access channel occasion group among the multiple random access channel occasion groups) corresponding to the first synchronization signal block according to the index of the received (detected) first synchronization signal block, the first node may transmit a preamble on the random access channel occasion group.

[0080] In one embodiment, for any random access channel occasion group among the multiple random access channel occasion groups, the preamble index included in any random access channel occasion in the random access channel occasion group may be the same. A first random access channel occasion group among the multiple random access channel occasion groups is used as an example, and all preamble indexes included in the multiple random access channel occasions included in the first random access channel occasion group may be the same. For example, all preamble indexes included in the multiple random access channel occasions included in the first random access channel occasion group may range from 0 to 63.

[0081] In one embodiment, for any random access channel occasion group among the plurality of random access channel occasion groups, the preamble indexes included in any random access channel occasions in the random access channel occasion group may be different or partially different. A first random access channel occasion group among the plurality of random access channel occasion groups is still used as an example, and the preamble indexes included in the plurality of random access channel occasions included in the first random access channel occasion group may be different. For example, the first random access channel occasion group includes four random access channel occasions, and the preamble indexes included in the four random access channel occasions may be in the ranges of 0 to 63, 64 to 127, 128 to 191, and 192 to 255, respectively.

[0082] In one embodiment, the first random access channel occasion group corresponds to a first occasion group type, i.e., the first random access channel occasion group corresponds to a first occasion group type. The first occasion group type is one of a plurality of candidate occasion group types. The first occasion group type and / or the candidate occasion group type may include a plurality of types of information, such as a repetition factor, a frequency hopping indication, and a frequency hopping pattern, which will be described in detail below with reference to specific examples and will not be described in detail herein.

[0083] In an embodiment of the present application, the index of the first synchronization signal block, the first occasion group type, and the first mapping order may be used to determine a first random access channel occasion group. Thus, after receiving the first synchronization signal block, the first node may determine a first random access channel occasion group corresponding to the first synchronization signal block based on the index of the first synchronization signal block, the first occasion group type, and the first mapping order. In addition, the multiple random access channel occasions included in the first random access channel occasion group 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 multiple preambles in the first preamble group on multiple random access channel occasions in the first random access channel occasion group, thereby reducing random access delay and improving utilization efficiency of random access resources.

[0084] 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 a first random access channel occasion group from a plurality of random access channel occasion groups.

[0085] 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 a first random access channel occasion group from a plurality of random access channel occasion groups in a first time period.

[0086] 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 random access channel occasion group from a plurality of random access channel occasions in the first time period.

[0087] As long as the first random access channel occasion group corresponding to the first synchronization signal block can be determined by combining the above three types of information, or the first random access channel occasion group can be selected from multiple random access channel occasion groups by using the above three types of information in the embodiments of the present application, the implementation of determining the first random access channel occasion group by using the index of the first synchronization signal block, the first occasion group type, and the first mapping order is not limited in the embodiments of the present application. The following provides some implementation examples for determining the first random access channel occasion group by using the index of the first synchronization signal block, the first occasion group type, and the first mapping order.

[0088] In one embodiment, using the index of the first synchronization signal block, the first occasion group type, and the first mapping order to determine the first random access channel occasion group includes mapping the index of the first synchronization signal block to at least two random access channel occasion groups among the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups each corresponding to at least two different candidate occasion group types, and using the first occasion group type to determine the first random access channel occasion group from the at least two random access channel occasion groups.

[0089] In one embodiment, using the first synchronization signal block index, the first occasion group type, and the first mapping order to determine the first random access channel occasion group includes: the first occasion group type being used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups; and the first synchronization signal block index and the first mapping order being 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.

[0090] In one embodiment, L is one of {4, 8, 64}.

[0091] In one embodiment, any random access channel occasion group in the plurality of random access channel occasion groups is within the first time period.

[0092] In one embodiment, the first period may be understood as a mapping cycle of synchronization signal blocks and random access channel occasions.

[0093] In one embodiment, the first period may include one or more PRACH slots. A first period including multiple PRACH slots is used as an example, and the number 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 number of PRACH slots.

[0094] In one embodiment, any random access channel occasion of any random access channel occasion group in the plurality of random access channel occasion groups is in one of the plurality of PRACH slots in the first time period.

[0095] In one embodiment, the above-mentioned plurality of random access channel occasion groups are in a first time period, in other words, the mapping of the plurality of candidate synchronization signal block indexes to the plurality of random access channel occasion groups in a first mapping order is performed in the first time period.

[0096] In one embodiment, the first period includes a plurality of random access channel occasions.

[0097] 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 time period. Alternatively, one or more of the plurality of random access channel occasions included in the first time period may constitute any random access channel occasion group in the plurality of random access channel occasion groups.

[0098] In one embodiment, mapping a plurality of candidate synchronization signal block indices to a plurality of random access channel occasion groups in a first mapping order may refer to mapping a plurality of candidate synchronization signal block indices to a plurality of random access channel occasion groups in a first time period in a first mapping order.

[0099] In one embodiment, mapping a plurality of candidate synchronization signal block indices to a plurality of random access channel occasion groups in a first mapping order may refer to mapping a plurality of candidate synchronization signal block indices to a plurality of random access channel occasions in a first time period in a first mapping order.

[0100] In one embodiment, any candidate synchronization signal block index among the plurality of candidate synchronization signal block indexes may be mapped to at least one random access channel occasion group in the first time period.

[0101] In one embodiment, any candidate synchronization signal block index among the plurality of candidate synchronization signal block indexes may be mapped to at least one random access channel occasion within the first time period.

[0102] In one embodiment, the mapping of the plurality of candidate synchronization signal block indices to the plurality of random access channel occasion groups is performed within a first time period.

[0103] In one embodiment, the first period may refer to a PRACH configuration period.

[0104] In one embodiment, the first period may refer to an association period in which multiple candidate synchronization signal block indices are mapped to multiple random access channel occasion groups.

[0105] In one embodiment, the first period may refer to an association pattern period that includes one or more association periods.

[0106] 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 the smallest value in a set determined based on the PRACH configuration period.

[0107] In one embodiment, for the set determined based on the PRACH configuration period, reference may be made to Table 1, i.e., the first period may be determined from Table 1.

[0108] [Table 1]

[0109] In one embodiment, the first period may start at frame number 0.

[0110] 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 random access channel occasion group. The first occasion group type and the first mapping order are respectively described below.

[0111] The first occasion group type may include one or more types of the following information: a first repetition factor, a first frequency hopping indication, and a first frequency hopping pattern.

[0112] In one embodiment, the first occasion group type may include one type of information described above, for example, may include only the first repetition factor, or may include only the first frequency hopping indication, or may include only the first frequency hopping pattern.

[0113] In one embodiment, the first occasion group type may include more than one type of information described above, for example, a first repetition factor and a first frequency hopping indication, or a first repetition factor and a first frequency hopping pattern, or a first repetition factor, a first frequency hopping indication, and a first frequency hopping pattern, etc.

[0114] In one embodiment, the first occasion group type may include other information in addition to one or more types of information described above, which is not limited in the embodiment of the present application.

[0115] In one embodiment, the first occasion group type may include a first repetition factor, and the number of all random access channel occasions included in the first random access channel occasion group is equal to the first repetition factor. For example, if the first repetition factor is 4, the number of random access channel occasions included in the first random access channel occasion group is 4. In other words, the first random access channel occasion group includes four random access channel occasions.

[0116] In one embodiment, the first repetition factor is a positive integer. For example, the first repetition factor may be any positive integer, such as 2, 4, 8, or 16.

[0117] In one embodiment, the first repetition factor is predefined in the protocol or network being configured.

[0118] In one embodiment, the first repetition factor may be one of two and four.

[0119] In one embodiment, the first repetition factor may be one of two, four, and eight.

[0120] In one embodiment, the first repetition factor may be one of 1, 2, 4, and 8.

[0121] In one embodiment, the repetition factors are not equal.

[0122] In one embodiment, the first repetition factor is one of a plurality of repetition factors, which may refer to the repetition factor of the preamble group transmission, i.e., the number of repetitions of the preamble transmission.

[0123] In one embodiment, the plurality of repetition factors may include at least 2 and 4. For example, the plurality of repetition factors may include only 2 and 4, or the plurality of repetition factors may include 2, 4, and other positive integers.

[0124] In one embodiment, the multiple repetition factors may include two, four, and eight.

[0125] In one embodiment, the multiple repetition factors may include 1, 2, and 4.

[0126] In one embodiment, the multiple repetition factors may include 1, 2, 4, and 8.

[0127] In one embodiment, the repetition factors may be 2 and 4, respectively.

[0128] In one embodiment, the multiple repetition factors may be 2, 4, and 8, respectively.

[0129] In one embodiment, the multiple repetition factors may be 1, 2, and 4, respectively.

[0130] In one embodiment, the multiple repetition factors may be 1, 2, 4, and 8, respectively.

[0131] In one embodiment, the quantity of all random access channel occasions included in any random access channel occasion group among the plurality of random access channel occasion groups is equal to one of the plurality of repetition factors, for example, the plurality of repetition factors are 2 and 4, respectively. Any random access channel occasion group among the plurality of random access channel occasion groups includes either two random access channel occasions or four random access channel occasions.

[0132] 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, wherein the first candidate occasion group type is different from the second candidate occasion group type.

[0133] In one embodiment, the first candidate occasion group type being different from the second candidate occasion group type may include a repetition factor included in the first candidate occasion group type being different from a repetition factor included in the second candidate occasion group type.

[0134] In one embodiment, when the first occasion group type belongs to a different candidate occasion group type, the first repetition factor included in the first occasion group type is different. For example, when the first occasion group type is the first candidate occasion group type, the first repetition factor is one of the multiple repetition factors, and when the first occasion group type is the second candidate occasion group type, the first repetition factor is a repetition factor among the multiple repetition factors other than the repetition factor included in the first candidate occasion group type. As a specific example, when the first occasion group type is the first candidate occasion group type, the first repetition factor may be 2, and when the first occasion group type is the second candidate occasion group type, the first repetition factor may be 4.

[0135] In one embodiment, any random access channel occasion group among the plurality of random access channel occasion groups corresponds to one of a plurality of candidate occasion group types. For example, the plurality of random access channel occasion groups may include four random access channel occasion groups A, B, C, and D, and the candidate occasion group types may include a first candidate occasion group type and a second candidate occasion group type, where random access channel occasion group A and random access channel occasion group B may correspond to the first candidate occasion group type and random access channel occasion group C and random access channel occasion group D may correspond to the second candidate occasion group type.

[0136] In one embodiment, the plurality of candidate occasion group types each include a plurality of repetition factors. For example, the plurality of repetition factors may include 2 and 4, and a first candidate occasion group type in the plurality of candidate occasion group types may include a repetition factor of 2 and a second candidate occasion group type may include a repetition factor of 4.

[0137] In one embodiment, the quantity of all random access channel occasions included in the second random access channel occasion group is equal to the repetition factor included in the candidate occasion group type corresponding to the second random access channel occasion group, where the second random access channel occasion group is any random access channel occasion group among the plurality of random access channel occasion groups. 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 having 2, the quantity of random access channel occasions included in the second random access channel occasion group is 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 having 4, the quantity of random access channel occasions included in the second random access channel occasion group is equal to 4.

[0138] In one embodiment, the plurality of candidate occasion group types each include a plurality of repetition factors, and the quantity of all random access channel occasions included in any random access channel occasion group among the plurality of random access channel occasion groups is equal to one repetition factor among the plurality of repetition factors. For example, the quantity of all random access channel occasions included in any random access channel occasion group among the plurality of random access channel occasion groups may be equal to one of 1, 2, 4, and 8.

[0139] In one embodiment, the first occasion group type may include a first frequency hopping indication. The first frequency hopping indication may be used to determine whether frequency 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 may be used to determine whether frequency resources occupied by at least two random access channel occasions in the first random access channel occasion group are the same.

[0140] 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, wherein the first candidate occasion group type is different from the second candidate occasion group type.

[0141] In one embodiment, the first candidate occasion group type being different from the second candidate occasion group type may include a frequency hopping indication included in the first candidate occasion group type being different from a frequency hopping indication included in the second candidate occasion group type.

[0142] In one embodiment, when the first occasion group type belongs to a different candidate occasion group type, the frequency hopping indication included in the first occasion group type indicates different information. For example, when the first occasion group type is the first candidate occasion group type, the first frequency hopping indication may be used to indicate that the frequency resources occupied by all random access channel occasions in the first random access channel occasion group are the same, and when the first occasion group type is the second candidate occasion group type, the first frequency hopping indication may be used to indicate that the frequency resources occupied by at least two random access channel occasions in the first random access channel occasion group are different.

[0143] In one embodiment, the first occasion group type may include a first frequency hopping pattern that is used to determine frequency resources occupied by any random access channel occasions in the first random access channel occasion group.

[0144] In one embodiment, the frequency resources occupied by any random access channel occasion in the first random access channel occasion group correspond to a first frequency hopping pattern.

[0145] 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, wherein the first candidate occasion group type is different from the second candidate occasion group type.

[0146] In one embodiment, the first candidate occasion group type being different from the second candidate occasion group type may include the frequency hopping pattern included in the first candidate occasion group type being different from the frequency hopping pattern included in the second candidate occasion group type.

[0147] In one embodiment, when the first occasion group type belongs to a different candidate occasion group type, the pattern of the first frequency hopping pattern included in the first occasion group type is 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, and 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, and the frequency hopping pattern is at least partially different from frequency hopping pattern B.

[0148] In one embodiment, the plurality of candidate occasion group types may include a plurality of frequency hopping patterns, and the frequency resources occupied by any random access channel occasion group in the plurality of random access channel occasion groups correspond to one frequency hopping pattern in the plurality of frequency hopping patterns.

[0149] 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 including a plurality of frequency hopping patterns, and the frequency resources occupied by any random access channel occasion group in the plurality of random access channel occasion groups corresponds to one frequency hopping pattern in the plurality of frequency hopping patterns.

[0150] In one embodiment, the first occasion group type is one of a plurality of candidate occasion group types, and therefore the plurality of candidate occasion group types may include one or more of the following information: a repetition factor, a frequency hopping indication, and a frequency hopping pattern. The specific content of the information included in the plurality of candidate occasion group types is similar to that included in the first occasion group type, and for a specific description, reference may be made to the description of the information included in the first occasion group type. For the sake of brevity, the details will not be described again in this specification.

[0151] In an embodiment of the present application, multiple random access channel occasions are grouped into multiple random access channel occasion groups by using multiple candidate occasion group types (e.g., multiple repetition factors) so that the number of random access channel occasions occupied by preamble group transmissions is variable.

[0152] The first mapping order is described in detail below.

[0153] In one embodiment, the first mapping order is associated with one or more of the following information: a preamble index within a random access channel occasion group, frequency resources of the multiple random access channel occasion groups, and time domain resources of the multiple random access channel occasion groups.

[0154] In one embodiment, the first mapping order may include a varying order of preamble indexes within one random access channel occasion group among the plurality of random access channel occasion groups, for example, an ascending order of preamble indexes or a descending order of preamble indexes. In other words, the plurality of candidate synchronization signal block indexes may be arranged in a varying order (such as an ascending order) of preamble indexes within one random access channel occasion group among the plurality of random access channel occasion groups.

[0155] In one embodiment, the first mapping order may include a varying order of frequency resources of the multiple random access channel occasion groups, for example, an ascending order of frequency resources or a descending order of frequency resources. In other words, the multiple candidate synchronization signal block indexes may be arranged in a varying order (such as an ascending order) of frequency resources of the multiple random access channel occasion groups for the frequency-multiplexed multiple random access channel occasion groups.

[0156] In one embodiment, the first mapping order may include forming a varying order of time domain resources of the multiple random access channel occasion groups, for example, an ascending order of time domain resources or a descending order of time domain resources. In other words, the multiple candidate synchronization signal block indexes may be arranged in a varying order (such as an ascending order) of time domain resources of the multiple random access channel occasion groups for the time-multiplexed multiple random access channel occasion groups.

[0157] In one embodiment, the first mapping order may include one or more of the following orders: ascending order of preamble index within a random access channel occasion group among the plurality of random access channel occasion groups; ascending order of frequency resources for the plurality of random access channel occasion groups; and ascending order of time domain resources for the plurality of random access channel occasion groups.

[0158] In one embodiment, the first mapping order may include, first, ascending order of preamble indexes within a random access channel occasion group among the plurality of random access channel occasion groups; second, ascending order of frequency resources for the plurality of random access channel occasion groups; and third, ascending order of time domain resources for the plurality of random access channel occasion groups.

[0159] However, the embodiments of the present application are not limited thereto, and the above orders included in the first mapping order may be arranged and combined randomly, and the sequence of the above orders may also be changed. For example, the first mapping order may include: first, ascending order of preamble indexes within one random access channel occasion group among the multiple random access channel occasion groups; second, ascending order of time domain resources for the multiple random access channel occasion groups; and third, ascending order of frequency resources for the multiple random access channel occasion groups.

[0160] In one embodiment, the multiple random access channel occasion groups may include multiple random access channel occasions, and each random access channel occasion among the multiple random access channel occasions included in the multiple random access channel occasion groups may belong to only one random access channel occasion group among the multiple random access channel occasion groups. In other words, the multiple random access channel occasion groups are not repeated, i.e., the resources (e.g., random access channel occasions) occupied by the multiple random access channel occasion groups do not overlap.

[0161] An example in which each random access channel occasion among a plurality of random access channel occasions belongs to only one random access channel occasion group is provided below with reference to FIG.

[0162] As shown in Figure 4, it is assumed that the repetition factors included in the plurality of candidate occasion group types are 1, 2, and 4, respectively, and 4 is the maximum repetition factor Qmax, i.e., the maximum repetition factor Qmax for preamble group transmission is 4. As an implementation form, within a first period, all random access channel occasions within the first period may be successively classified into a plurality of random access channel occasion groups according to the repetition factors included in the plurality of candidate occasion group types.

[0163] In the example shown in FIG. 4, all random access channel occasions in a first time period are successively classified into a plurality of random access channel occasion groups in descending order of a plurality of repetition factors included in a plurality of candidate occasion group types.

[0164] In the example shown in FIG. 4, each dotted box represents a random access channel occasion group, and the random access channel occasion groups are successively obtained through sorting in descending order of multiple repetition factors (1, 2, and 4).

[0165] In the example shown in Figure 4, the multiple random access channel occasion groups include multiple random access channel occasions. Any random access channel occasion included in the multiple random access channel occasion groups belongs to only one random access channel occasion group. For example, random access channel occasion 1 (RO1 in the figure) belongs to only one random access channel occasion group (ROG1 in the figure), random access channel occasion 8 (RO8 in the figure) belongs to only one random access channel occasion group (ROG2 in the figure), etc.

[0166] In the example shown in FIG. 4, the multiple random access channel occasion groups include multiple random access channel occasions. For each random access channel occasion included in the multiple random access channel occasion groups, a different candidate synchronization signal block index is mapped to a different preamble among the multiple preambles included in each random access channel occasion. For example, random access channel occasion 1 is used as an example, and both candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are mapped to random access channel occasion 1, but candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are mapped to different preambles in random access channel occasion 1. For example, candidate synchronization signal block index 0 is mapped to preambles 0 to 21 in random access channel occasion 1, and candidate synchronization signal block index 1 is mapped to preambles 22 to 43 in random access channel occasion 1.

[0167] In one embodiment, the multiple random access channel occasion groups may include multiple random access channel occasions, and each random access channel occasion among the multiple random access channel occasions included in the multiple random access channel occasion groups may be shared by at least two random access channel occasion groups among the multiple random access channel occasion groups. In other words, the resources (e.g., random access channel occasions) occupied by the multiple random access channel occasion groups may overlap in some cases.

[0168] An example in which each random access channel occasion among a plurality of random access channel occasions is shared by at least two random access channel occasion groups among a plurality of random access channel occasion groups is provided below with reference to FIG. 5.

[0169] As shown in Figure 5, it is assumed that the repetition factors included in the plurality of candidate occasion group types are 1, 2, and 4, respectively, and 4 is the maximum repetition factor Qmax, i.e., the maximum repetition factor Qmax for preamble group transmission is 4. As an implementation form, within a first period, all random access channel occasions within the first period may be classified into a plurality of random access channel occasion groups according to the repetition factors included in the plurality of candidate occasion group types.

[0170] In the example shown in FIG. 5, all random access channel occasions in a first time period are classified into a plurality of random access channel occasion groups according to a plurality of repetition factors included in a plurality of candidate occasion group types.

[0171] In the example shown in Figure 5, each dotted box represents a random access channel occasion group, which is obtained through classification with multiple repetition factors (1, 2, and 4). The dotted oval box and the dotted square box represent random access channel occasion groups obtained through classification with different repetition factors, respectively. For example, the dotted oval box represents a random access channel occasion group obtained through classification with a repetition factor of 4, and the dotted square box represents a random access channel occasion group obtained through classification with a repetition factor of 2.

[0172] In the example shown in Figure 5, the multiple random access channel occasion groups include multiple random access channel occasions. Any random access channel occasion included in the multiple random access channel occasion groups is shared by at least two random access channel occasion groups among the multiple random access channel occasion groups. For example, random access channel occasion 1 (RO1 in the figure) is shared by two random access channel occasion groups (ROG1 and ROG7 in the figure), random access channel occasion 8 (RO8 in the figure) is shared by two random access channel occasion groups (ROG2 and ROG8 in the figure), etc.

[0173] In the example shown in FIG. 5, the multiple random access channel occasion groups include multiple random access channel occasions. For each random access channel occasion included in the multiple random access channel occasion groups, at least two random access channel occasion groups sharing the random access channel occasion are mapped to different preambles among the multiple preambles included in the random access channel occasion. For example, random access channel occasion 1 is used as an example, and random access channel occasion group 1 and random access channel occasion group 7 share the random access channel occasion 1 and are both mapped to the random access channel occasion 1. However, random access channel occasion group 1 and random access channel occasion group 7 are mapped to different preambles within the random access channel occasion 1. For example, random access channel occasion group 1 is mapped to preambles 0 to 21 within the random access channel occasion 1, and random access channel occasion group 7 is mapped to preambles 22 to 43 within the random access channel occasion 1.

[0174] 6 shows another example in which each random access channel occasion among a plurality of random access channel occasions is shared by at least two random access channel occasion groups among a plurality of random access channel occasion groups. The solution shown in FIG. 6 may be understood as a combination (or mixture) of the implementation forms shown in FIG. 4 and FIG. 5.

[0175] As shown in FIG. 6, it is assumed that the repetition factors included in the plurality of candidate occasion group types are 1, 2, and 4, respectively, and 4 is the maximum repetition factor Qmax. In other words, it is assumed that the maximum repetition factor Qmax for preamble group transmission is 4. In one implementation, within a first period, all random access channel occasions within the first period may be successively classified into a plurality of random access channel occasion groups according to the repetition factors included in the plurality of candidate occasion group types (i.e., first classified into a plurality of random access channel occasion groups according to the implementation shown in FIG. 4). Then, for random access channel occasion groups in which preambles are not exhausted among the plurality of random access channel occasion groups, further classification is performed on the random access channel occasion groups in which preambles are not exhausted. The candidate occasion group types (e.g., repetition factors) corresponding to the two classifications are different. For example, the further classification may be performed according to the implementation shown in FIG. 5.

[0176] In the example shown in FIG. 6, each dotted box represents a random access channel occasion group, the dotted oval boxes represent multiple random access channel occasion groups initially obtained through successive classification with multiple repetition factors included among multiple candidate occasion group types, and the dotted square boxes represent random access channel occasion groups obtained through further classification for random access channel occasion groups whose preambles have not been exhausted.

[0177] In the example shown in Figure 6, the multiple random access channel occasion groups include multiple random access channel occasions. Any random access channel occasion included in the multiple 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 among the multiple random access channel occasion groups. For example, random access channel occasion 1 (RO1 in the figure) belongs to only random access channel occasion group 1 (ROG1 in the figure), random access channel occasion 13 (RO13 in the figure) is shared by two random access channel occasion groups (ROG4 and ROG12 in the figure), etc.

[0178] In the example shown in FIG. 6, the multiple random access channel occasion groups include multiple random access channel occasions. For each random access channel occasion included in the multiple 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 indexes may be mapped to different preambles among the multiple preambles included in each random access channel occasion. For example, random access channel occasion 1 is used as an example, and both candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are mapped to random access channel occasion 1, but candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are mapped to different preambles within random access channel occasion 1. For example, candidate synchronization signal block index 0 is mapped to preambles 0 to 21 within random access channel occasion 1, and candidate synchronization signal block index 1 is mapped to preambles 22 to 43 within random access channel occasion 1. When a random access channel occasion is shared by at least two random access channel occasion groups, the at least two random access channel occasion groups sharing the random access channel occasion may be mapped to different preambles among multiple preambles included in the random access channel occasion. For example, random access channel occasion 13 is used as an example, and random access channel occasion group 4 and random access channel occasion group 12 share random access channel occasion 13 and are both mapped to random access channel occasion 13.However, random access channel occasion group 4 and random access channel occasion group 12 are mapped to different preambles in random access channel occasion 13, for example, random access channel occasion group 4 is mapped to preambles 0 to 21 in random access channel occasion 13, and random access channel occasion group 12 is mapped to preambles 22 to 43 in random access channel occasion 13.

[0179] 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 shown in FIG. 7 may include steps S710 to S730.

[0180] In step S710, the first node receives a first synchronization signal block.

[0181] In step S720, the first node transmits the first preamble group.

[0182] For the relevant description of step S710 and step S720, reference may be made to the above description of step S310 and step S320, and details will not be described herein.

[0183] In step S730, the first node receives a first random access response within a first time window in response to transmitting the first preamble group.

[0184] In one embodiment, the first random access channel occasion group may be used to determine one or more of the following: determining the start of the first time window and determining the scrambling sequence of the first random access response.

[0185] In a particular embodiment, the first random access channel occasion group is used to determine the start of a first time window.

[0186] In another particular embodiment, the first random access channel occasion group is used to determine the start of the first time window and the scrambling sequence of the first random access response.

[0187] Method embodiments of the present application have been described in detail above with reference to Figures 1 to 7. Apparatus embodiments of the present application will be described in detail below with reference to Figures 8 to 10. It should be understood that the description of the method embodiments corresponds to the description of the apparatus embodiments, and therefore, for parts not described in detail, reference may be made to the above method embodiments.

[0188] 8 is a schematic structural diagram of a first node according to an embodiment of the present application. The first node 800 shown in FIG. 8 may include a first receiving set 810 and a first transmitting set 820.

[0189] The first receiving set 810 may be configured to receive a first synchronization signal block, where the index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes.

[0190] The first transmission set 820 may be configured to transmit a first preamble group, the first preamble group including multiple preambles. The first random access channel occasion group includes multiple random access channel occasions, and the multiple random access channel occasions in the first random access channel occasion group are used to transmit the multiple preambles in the first preamble group. Any two random access channel occasions in the first random access channel occasion group are orthogonal in the time domain. Multiple candidate synchronization signal block indexes are mapped to the multiple random access channel occasion groups in a first mapping order, and the first random access channel occasion group is one of the multiple 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 of the multiple 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 a first random access channel occasion group.

[0191] In one embodiment, any random access channel occasion group in the plurality of random access channel occasion groups is within the first time period.

[0192] In one embodiment, the first occasion group type includes a first repetition factor, the quantity of random access channel occasions included in the first random access channel occasion group is equal to the first repetition factor, and the first repetition factor is one of a plurality of repetition factors.

[0193] In one embodiment, any random access channel occasion group among 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 each include a plurality of repetition factors, and the quantity of random access channel occasions included in a second random access channel occasion group is equal to the repetition factor included in the candidate occasion group type corresponding to the second random access channel occasion group. The second random access channel occasion group is any random access channel occasion group among the plurality of random access channel occasion groups.

[0194] In one embodiment, the first occasion group type includes a first frequency hopping indication, and the first frequency hopping indication is used to determine whether frequency resources occupied by at least two random access channel occasions in the first random access channel occasion group are different.

[0195] In one embodiment, the first occasion group type includes a first frequency hopping pattern, and the frequency resources occupied by any random access channel occasion in the first random access channel occasion group correspond to the first frequency hopping pattern.

[0196] In one embodiment, using the index of the first synchronization signal block, the first occasion group type, and the first mapping order to determine the first random access channel occasion group includes mapping the index of the first synchronization signal block to at least two random access channel occasion groups among the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups each corresponding to at least two different candidate occasion group types, and using the first occasion group type to determine the first random access channel occasion group from the at least two random access channel occasion groups.

[0197] In one embodiment, using the first synchronization signal block index, the first occasion group type, and the first mapping order to determine the first random access channel occasion group includes: the first occasion group type being used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups; and the first synchronization signal block index and the first mapping order being 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.

[0198] In one embodiment, the first mapping order comprises one or more of the following orders: ascending order of preamble index within a random access channel occasion group among the plurality of random access channel occasion groups; ascending order of frequency resources for the plurality of random access channel occasion groups; and ascending order of time domain resources for the plurality of random access channel occasion groups.

[0199] In one embodiment, the first mapping order includes, first, ascending order of preamble indexes within a random access channel occasion group among the plurality of random access channel occasion groups; second, ascending order of frequency resources for the plurality of random access channel occasion groups; and third, ascending order of time domain resources for the plurality of random access channel occasion groups.

[0200] In one embodiment, the plurality of random access channel occasion groups include a plurality of random access channel occasions, and each random access channel occasion among the plurality of random access channel occasion groups belongs to only one random access channel occasion group among the plurality of random access channel occasion groups, or each random access channel occasion is shared by at least two random access channel occasion groups among the plurality of random access channel occasion groups.

[0201] In one embodiment, at least two random access channel occasions in at least one random access channel occasion group in the plurality of random access channel occasion groups are in two different slots.

[0202] In one embodiment, the first node 800 further includes a second receiving set configured to receive a first random access response within a first time window in response to transmitting the first preamble group, the first random access channel occasion group being used to determine a start of the first time window, and the first random access channel occasion group being used to determine a scrambling sequence for the first random access response.

[0203] In one embodiment, the first receive set 810 and the first transmit set 820 may be transceivers 1030. The first node 800 may further include a processor 1010 and a memory 1020 as shown in FIG.

[0204] 9 is a schematic structural diagram of a second node according to an embodiment of the present application. The second node 900 shown in FIG. 9 may include: a first transmitting set 910 and a first receiving set 920.

[0205] The first transmission set 910 may be configured to transmit one or more synchronization signal blocks, where the first synchronization signal block is one of the one or more synchronization signal blocks and the index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes.

[0206] The first receiving set 920 may be configured to receive a first preamble group, the first preamble group including multiple preambles. The first random access channel occasion group includes multiple random access channel occasions, and the multiple random access channel occasions in the first random access channel occasion group are used to transmit the multiple preambles in the first preamble group. Any two random access channel occasions in the first random access channel occasion group are orthogonal in the time domain. Multiple candidate synchronization signal block indexes are mapped to the multiple random access channel occasion groups in a first mapping order, and the first random access channel occasion group is one of the multiple 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 of the multiple 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 a first random access channel occasion group.

[0207] In one embodiment, any random access channel occasion group in the plurality of random access channel occasion groups is within the first time period.

[0208] In one embodiment, the first occasion group type includes a first repetition factor, the quantity of random access channel occasions included in the first random access channel occasion group is equal to the first repetition factor, and the first repetition factor is one of a plurality of repetition factors.

[0209] In one embodiment, any random access channel occasion group among 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 each include a plurality of repetition factors, and the quantity of random access channel occasions included in a second random access channel occasion group is equal to the repetition factor included in the candidate occasion group type corresponding to the second random access channel occasion group. The second random access channel occasion group is any random access channel occasion group among the plurality of random access channel occasion groups.

[0210] In one embodiment, the first occasion group type includes a first frequency hopping indication, and the first frequency hopping indication is used to determine whether frequency resources occupied by at least two random access channel occasions in the first random access channel occasion group are different.

[0211] In one embodiment, the first occasion group type includes a first frequency hopping pattern, and the frequency resources occupied by any random access channel occasion in the first random access channel occasion group correspond to the first frequency hopping pattern.

[0212] In one embodiment, using the index of the first synchronization signal block, the first occasion group type, and the first mapping order to determine the first random access channel occasion group includes mapping the index of the first synchronization signal block to at least two random access channel occasion groups among the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups each corresponding to at least two different candidate occasion group types, and using the first occasion group type to determine the first random access channel occasion group from the at least two random access channel occasion groups.

[0213] In one embodiment, using the first synchronization signal block index, the first occasion group type, and the first mapping order to determine the first random access channel occasion group includes: the first occasion group type being used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups; and the first synchronization signal block index and the first mapping order being 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.

[0214] In one embodiment, the first mapping order comprises one or more of the following orders: ascending order of preamble index within a random access channel occasion group among the plurality of random access channel occasion groups; ascending order of frequency resources for the plurality of random access channel occasion groups; and ascending order of time domain resources for the plurality of random access channel occasion groups.

[0215] In one embodiment, the first mapping order includes, first, ascending order of preamble indexes within a random access channel occasion group among the plurality of random access channel occasion groups; second, ascending order of frequency resources for the plurality of random access channel occasion groups; and third, ascending order of time domain resources for the plurality of random access channel occasion groups.

[0216] In one embodiment, the plurality of random access channel occasion groups include a plurality of random access channel occasions, and each random access channel occasion among the plurality of random access channel occasion groups belongs to only one random access channel occasion group among the plurality of random access channel occasion groups, or each random access channel occasion is shared by at least two random access channel occasion groups among the plurality of random access channel occasion groups.

[0217] In one embodiment, at least two random access channel occasions in at least one random access channel occasion group in the plurality of random access channel occasion groups are in two different slots.

[0218] In one embodiment, the second node 900 includes a second transmission set configured to transmit a first random access response in a first time window in response to receiving the first preamble group, the first random access channel occasion group being used to determine the start of the first time window, and the first random access channel occasion group being used to determine a scrambling sequence for the first random access response.

[0219] In one embodiment, the first transmitting set 910 and the first receiving set 920 may be transceivers 1030. The second node 900 may further include a processor 1010 and a memory 1020 as shown in FIG.

[0220] 10 is a schematic structural diagram of a communication device according to an embodiment of the present application. The dashed lines in FIG. 10 indicate that the unit or module is optional. The device 1000 may be configured to implement the method described in the above method embodiments. The device 1000 may be a chip, a UE, or a network device.

[0221] The device 1000 may include one or more processors 1010. The processor 1010 may enable the device 1000 to perform the methods described in the method embodiments above. The processor 1010 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or another programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

[0222] The apparatus 1000 may further include one or more memories 1020. The memories 1020 store programs that may be executed by the processor 1010 to cause the processor 1010 to perform the methods described in the above method embodiments. The memory 1020 may be separate from the processor 1010 or may be integrated within the processor 1010.

[0223] The apparatus 1000 may further include a transceiver 1030. The processor 1010 may communicate with another device or chip through the transceiver 1030. For example, the processor 1010 may transmit and receive data to and from another device or chip through the transceiver 1030.

[0224] For ease of understanding, the hardware modules of the communication devices of the first node and the second node are briefly described below.

[0225] 11, which is a schematic diagram of a hardware module of a communication device according to an embodiment of the present application. In particular, FIG. 11 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

[0226] The first communication device 450 includes a controller / processor 459 , a memory 460 , a data source 467 , a transmit processor 468 , a receive processor 456 , a multi-antenna transmit processor 457 , a multi-antenna receive processor 458 , a transmitter / receiver 454 , and an antenna 452 .

[0227] The second communication device 410 includes a controller / processor 475, a memory 476, a data source 477, a receive processor 470, a transmit processor 416, a multi-antenna receive processor 472, a multi-antenna transmit processor 471, a transmitter / receiver 418, and an antenna 420.

[0228] For transmissions from the second communication device 410 to the first communication device 450, upper layer data packets from the core network or from a data source 477 are provided to the controller / processor 475 in the second communication device 410. The core network and data source 477 represent all protocol layers above the L2 layer. The controller / processor 475 implements L2 layer functions. For transmissions from the second communication device 410 to the first communication device 450, the controller / processor 475 provides header compression, ciphering, packet segmentation and reordering, multiplexing between logical and transport channels, and allocation of radio resources for the first communication device 450 based on various priority measures. The controller / processor 475 is further responsible for retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions of the L1 layer (i.e., the physical layer). The transmit processor 416 performs coding and interleaving to facilitate forward error correction (FEC) and mapping of signal clusters based on various modulation schemes (such as binary phase shift keying, quadrature phase shift keying, M-phase shift keying, and M-quadrature amplitude modulation) at the second communication device 410. The multi-antenna transmit processor 471 performs digital spatial precoding, including codebook-based and non-codebook-based precoding, on the coded and modulated symbols and performs beamforming processing to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to a subcarrier, multiplexes the mapped spatial stream with reference signals (e.g., pilots) in the time and / or frequency domains, and then uses an inverse fast Fourier transform to generate a physical channel carrying the time-domain multicarrier symbol stream. The multi-antenna transmit processor 471 then performs analog precoding transmit / beamforming operations on the time-domain multicarrier symbol stream.Each transmitter 418 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream and then provides the radio frequency stream to a different antenna 420 .

[0229] In a transmission from the second communication device 410 to the first communication device 450, each receiver 454 in the first communication device 450 receives a signal through its corresponding antenna 452. Each receiver 454 recovers the information modulated onto a radio frequency carrier, converts the radio frequency stream to a baseband multi-carrier symbol stream, and provides the baseband multi-carrier symbol stream to a receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 perform various signal processing functions of the L1 layer. The multi-antenna receive processor 458 performs an analog precoding receive / beamforming operation on the baseband multi-carrier symbol stream from the receiver 454. The receive processor 456 converts the baseband multi-carrier symbol stream obtained after the analog precoding receive / beamforming operation from the time domain to the frequency domain via a fast Fourier transform. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receive 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 receive processor 458 to obtain any spatial streams that use the first communication device 450 as their destination. Symbols on each spatial stream are demodulated and recovered in the receive processor 456, and soft decisions are generated. The receive processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to the controller / processor 459. The controller / processor 459 performs the functions of the L2 layer. The controller / processor 459 may be associated with a memory 460 that stores program codes and data. The memory 460 may be referred to as a computer-readable medium.For transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 performs demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover upper layer data packets from the second communication device 410. The upper layer packets are then provided to all protocol layers above the L2 layer, or various control signals may be provided to the L3 layer for processing by the L3 layer.

[0230] In a transmission from the first communication device 450 to the second communication device 410, upper layer data packets are provided to the controller / processor 459 by using a data source 467 in the first communication device 450. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmission functions in the second communication device 410 described in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 performs header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels to perform L2 layer functions for the user plane and control plane. The controller / processor 459 is further responsible for retransmission of lost packets and signaling to the second communication device 410. The transmit processor 468 performs modulation and mapping and channel coding processing. The multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming processing. The transmit processor 468 then modulates the generated spatial streams into multi-carrier / single-carrier symbol streams, which undergo analog precoding / beamforming operations in the multi-antenna transmit processor 457 before being provided to different antennas 452 via transmitters 454. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency symbol stream and then provides the radio frequency symbol stream to the antenna 452.

[0231] For transmission from the first communication device 450 to the second communication device 410, the functions at the second communication device 410 are similar to the receiving functions at the first communication device 450 described for transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives radio frequency signals through its corresponding antenna 420, converts the received radio frequency signals to baseband signals, and provides the baseband signals to the multi-antenna receive processor 472 and the receive processor 470. The receive processor 470 and the multi-antenna receive processor 472 jointly perform functions of the L1 layer. The controller / processor 475 performs functions of the L2 layer. The controller / processor 475 may be associated with a memory 476 that stores program codes and data. The memory 476 may be referred to as a computer-readable medium. For transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 performs demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover upper layer data packets from the first communication device 450. The upper layer data packets from the controller / processor 475 may be provided to the core network or all protocol layers above the L2 layer, or various control signals may be provided to the core network or to the L3 layer for processing by the L3 layer.

[0232] In one embodiment, the first communication 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 for use with the at least one processor. The first communication device 450 is configured to at least receive a first synchronization signal block, where the index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes, and transmit a first preamble group, where the first preamble group includes a plurality of preambles. The first random access channel occasion group includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first random access channel occasion group are used to transmit the plurality of preambles in the first preamble group. Any two random access channel occasions in the first random access channel occasion group are orthogonal in the time domain. The plurality of candidate synchronization signal block indexes are mapped to the plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups, the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of the plurality of candidate occasion group types, and the first synchronization signal block index, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

[0233] In one embodiment, the first communication device 450 includes a memory for storing a computer-readable program of instructions, which, when executed by at least one processor, generates actions including receiving a first synchronization signal block, where the index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes, and transmitting a first preamble group, where the first preamble group includes a plurality of preambles. The first random access channel occasion group includes a plurality of random access channel occasions, and the plurality of random access channel occasions in the first random access channel occasion group are used to transmit the plurality of preambles in the first preamble group. Any two random access channel occasions in the first random access channel occasion group are orthogonal in the 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, and the first occasion group type is one of 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.

[0234] In one embodiment, the first communication device 450 corresponds to the first node in this application.

[0235] In one embodiment, the second communication device 410 corresponds to a second node in this application.

[0236] In one embodiment, the first communication device 450 is a UE.

[0237] In one embodiment, the first communication device 450 is a UE that supports V2X.

[0238] In one embodiment, the first communication device 450 is a UE that supports D2D.

[0239] In one embodiment, the first communication device 450 is a network-controlled repeater.

[0240] In one embodiment, the first communication device 450 is a relay.

[0241] In one embodiment, the second communication device 410 is a base station.

[0242] In one embodiment, antenna 452, receiver 454, multi-antenna receive processor 458, receive processor 456, and controller / processor 459 are configured to receive a first synchronization signal block in the present application.

[0243] In one embodiment, the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit 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 the one or more synchronization signal blocks.

[0244] In one embodiment, antenna 452, transmitter 454, multi-antenna transmit processor 457, transmit processor 468, and controller / processor 459 are configured to transmit a first preamble group in the present application.

[0245] In one embodiment, the antenna 420, the receiver 418, the multi-antenna receive processor 472, the receive processor 470, and the controller / processor 475 are configured to receive a first preamble group in the present application.

[0246] An 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 a terminal or a network device provided in the embodiments of the present application, and the program causes a computer to execute the method to be performed by the terminal or the network device in various embodiments of the present application.

[0247] An embodiment of the present application further provides a computer program product, which includes a program, which may be applied to a terminal or a network device provided in an embodiment of the present application, and which causes a computer to execute a method to be performed by the terminal or the network device in various embodiments of the present application.

[0248] An embodiment of the present application further provides a computer program, which may be applied to a terminal or a network device provided in the embodiments of the present application, and causes a computer to execute the method to be performed by the terminal or the network device in various embodiments of the present application.

[0249] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to describe particular embodiments of this application and are not intended to limit this application. It should be noted that the terms "first," "second," "third," "fourth," etc. in the specification, claims, and drawings of this application are used to distinguish different objects and not to indicate a particular order. In addition, the terms "include" and "have," and any variations thereof, are intended to cover a non-exclusive inclusion.

[0250] In the embodiments of the present application, "indicate" mentioned in this specification may refer to direct indication, or may refer to indirect indication, or may mean that there is an association relationship. For example, "A indicates B" may mean that A directly indicates B, for example, that B can be obtained by A, or that A indirectly indicates B, for example, that A indicates C and B can be obtained by C, or may mean that there is an association relationship between A and B.

[0251] In the embodiments of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B based only on A, and instead B may be determined based on A and / or other information.

[0252] In embodiments of the present application, the term "corresponding" may mean that there is a direct or indirect correspondence between two things, or that there is an association relationship between two things, or that there is a relationship such as showing and being shown, or comprising and being comprised.

[0253] In the embodiments of the present application, "predefined" or "pre-configured" may be implemented by pre-storing a corresponding code, table, or other format that can be used to indicate relevant information in a device (including, for example, a UE and a network device), and the specific implementation form thereof is not limited in the present application. For example, predefined may refer to being defined in a protocol.

[0254] In the embodiments of the present application, the term "protocol" may refer to a standard protocol in the communication field, and may include, for example, an LTE protocol, an NR protocol, and related protocols applied to future communication systems, which is not limited in the present application.

[0255] In the embodiments of the present application, the term "and / or" is merely an associative relationship describing related objects, and represents three possible relationships. For example, A and / or B may represent three cases: only A exists, both A and B exist, and only B exists. In addition, the symbol " / " in this specification generally indicates an "or" relationship between related objects.

[0256] In the embodiments of the present application, the sequence numbers of the above processes do not mean the execution order, and the execution order of the processes should be determined according to the functions and internal logic of the processes, and should not be construed as any limitation on the implementation process of the embodiments of the present application.

[0257] In some embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the described device embodiments are merely examples. For example, the unit division is merely a logical functional division, and other divisions may be used in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented. In addition, the shown or described mutual couplings or direct couplings or communication connections may be implemented by using some interfaces. Indirect couplings or communication connections between devices or units may be implemented in electronic, mechanical, or other forms.

[0258] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed over multiple network units. Some or all of the units may be selected according to the actual needs to achieve the objectives of the solution of this embodiment.

[0259] In addition, the functional units in the embodiments of the present application may be integrated into one processing unit, or each of the units may exist physically alone, or two or more units may be integrated into one unit.

[0260] All or part of the above embodiments may be implemented by using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, the above embodiments may be implemented entirely or partially in the form of a computer program product. A 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 the present application are generated entirely or partially. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or another programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center via a wired method (such as coaxial cable, optical fiber, and digital subscriber line (DSL)) or a wireless method (such as infrared, wireless, and microwave). The computer-readable storage medium may be any available medium readable by a computer or a data storage device such as a server or data center that integrates one or more available media. The usable media may be magnetic media (e.g., floppy disk, hard disk, or magnetic tape), optical media (e.g., digital versatile disk (DVD)), semiconductor media (e.g., solid state drive (SSD)), etc.

[0261] The above description is merely a specific implementation of the present application, and the scope of protection of the present application is not limited thereto. Any modifications or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application shall fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims. [Explanation of symbols]

[0262] 100 Wireless Communication System 110 Network Devices 120 User Equipment (UE) 410 Second Communication Device 416 Transmit Processor 418 Transmitter / Receiver 420 Antenna 450 first communication device 452 Antenna 454 Transmitter / Receiver 456 Receive Processor 457 Multi-Antenna Transmit Processor 458 Multi-Antenna Receive Processor 459 Controller / Processor 460 memory 467 Data Sources 468 Transmit Processor 470 Receive Processor 471 Multi-Antenna Transmit Processor 472 Multi-Antenna Receive Processor 475 Controller / Processor 476 memory 477 Data Sources 800 First Node 810 First receiving set 820 First Transmit Set 900 Second Node 910 First transmitting set 920 First receiving set 1000 devices 1010 processor 1020 memory 1030 Transceiver

Claims

1. 1. A method for a first node used for wireless communication, comprising: receiving a first synchronization signal block, the index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; transmitting a first preamble group, the first preamble group comprising a plurality of preambles, a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being used to transmit the plurality of preambles in the first preamble group, and any two random access channel occasions in the first random access channel occasion group being orthogonal in a time domain; Equipped with a first mapping order for mapping candidate synchronization signal block indexes to a plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups, the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of a plurality of candidate occasion group types, and the index of the first synchronization signal block, the first occasion group type, and the first mapping order being used to determine the first random access channel occasion group.

2. 2. The method of claim 1, wherein any random access channel occasion group among the plurality of random access channel occasion groups is within a first time period.

3. 3. The method of claim 1, wherein the first occasion group type comprises a first repetition factor, the quantity of random access channel occasions comprised in the first random access channel occasion group is equal to the value of the first repetition factor, and the first repetition factor is one of a plurality of repetition factors.

4. 4. The method of claim 3, wherein any random access channel occasion group among 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 each comprising the plurality of repetition factors, the quantity of random access channel occasions comprised in a second random access channel occasion group equals the value of the repetition factor comprised in the candidate occasion group type corresponding to the second random access channel occasion group, and the second random access channel occasion group is any random access channel occasion group among the plurality of random access channel occasion groups.

5. 5. The method of claim 1, wherein the first occasion group type comprises 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.

6. 6. The method of claim 1, wherein the first occasion group type comprises a first frequency hopping pattern, and frequency domain resources occupied by any random access channel occasion in the first random access channel occasion group correspond to the first frequency hopping pattern.

7. 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; 7. The method of claim 1, wherein the index of the first synchronization signal block is mapped to at least two random access channel occasion groups among the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups each corresponding 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.

8. 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; 7. The method of claim 1, wherein 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.

9. The first mapping order is the following order: an ascending order of preamble indexes within one random access channel occasion group among the plurality of random access channel occasion groups; an ascending order of frequency domain resources for the plurality of random access channel occasion groups; and 9. The method of claim 1, comprising one or more of: an ascending order of time domain resources for the plurality of random access channel occasion groups.

10. 10. The method of claim 9, wherein the first mapping order comprises: first, the ascending order of preamble indexes within a random access channel occasion group among the plurality of random access channel occasion groups; second, the ascending order of frequency domain resources for the plurality of random access channel occasion groups; and third, the ascending order of time domain resources for the plurality of random access channel occasion groups.

11. 11. The method according to claim 1, wherein the plurality of random access channel occasion groups comprise a plurality of random access channel occasions, and each random access channel occasion among the plurality of random access channel occasion groups belongs to only one random access channel occasion group among the plurality of random access channel occasion groups, or each random access channel occasion is shared by at least two random access channel occasion groups among the plurality of random access channel occasion groups.

12. 12. The method of claim 1, wherein at least two random access channel occasions in at least one random access channel occasion group in the plurality of random access channel occasion groups are in two different slots.

13. receiving a first random access response within a first time window in response to transmitting the first preamble group; 13. The method of claim 1, wherein the first random access channel occasion group is used to determine a start of the first time window, and the first random access channel occasion group is used to determine a scrambling sequence for the first random access response.

14. 1. A method for a second node used for wireless communication, comprising: transmitting one or more synchronization signal blocks, wherein a first synchronization signal block is one of the one or more synchronization signal blocks and an index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes; receiving a first preamble group, the first preamble group comprising a plurality of preambles, a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being used to transmit the plurality of preambles in the first preamble group, and any two random access channel occasions in the first random access channel occasion group being orthogonal in a time domain; Equipped with a first mapping order for mapping candidate synchronization signal block indexes to a plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups, the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of a plurality of candidate occasion group types, and the index of the first synchronization signal block, the first occasion group type, and the first mapping order being used to determine the first random access channel occasion group.

15. 15. The method of claim 14, wherein any random access channel occasion group among the plurality of random access channel occasion groups is within a first time period.

16. 16. The method of claim 14 or 15, wherein the first occasion group type comprises a first repetition factor, the quantity of random access channel occasions comprised in the first random access channel occasion group is equal to the value of the first repetition factor, and the first repetition factor is one of a plurality of repetition factors.

17. 17. The method of claim 16, wherein any random access channel occasion group among 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 each comprising the plurality of repetition factors, the quantity of random access channel occasions comprised in a second random access channel occasion group equals the value of the repetition factor comprised in the candidate occasion group type corresponding to the second random access channel occasion group, and the second random access channel occasion group is any random access channel occasion group among the plurality of random access channel occasion groups.

18. 18. The method of claim 14, wherein the first occasion group type comprises 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.

19. 19. The method of claim 14, wherein the first occasion group type comprises a first frequency hopping pattern, and frequency domain resources occupied by any random access channel occasion in the first random access channel occasion group correspond to the first frequency hopping pattern.

20. 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; 20. The method of claim 14, wherein the index of the first synchronization signal block is mapped to at least two random access channel occasion groups among the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups respectively corresponding 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.

21. 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; 20. The method of claim 14, wherein 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.

22. The first mapping order is the following order: an ascending order of preamble indexes within one random access channel occasion group among the plurality of random access channel occasion groups; an ascending order of frequency domain resources for the plurality of random access channel occasion groups; and 22. The method of any one of claims 14 to 21, comprising one or more of an ascending order of time domain resources for the plurality of random access channel occasion groups.

23. 23. The method of claim 22, wherein the first mapping order comprises: first, the ascending order of preamble indexes within a random access channel occasion group among the plurality of random access channel occasion groups; second, the ascending order of frequency domain resources for the plurality of random access channel occasion groups; and third, the ascending order of time domain resources for the plurality of random access channel occasion groups.

24. 24. The method of claim 14, wherein the plurality of random access channel occasion groups comprises a plurality of random access channel occasions, and each random access channel occasion among the plurality of random access channel occasion groups belongs to only one random access channel occasion group among the plurality of random access channel occasion groups, or each random access channel occasion is shared by at least two random access channel occasion groups among the plurality of random access channel occasion groups.

25. 25. The method of claim 14, wherein at least two random access channel occasions in at least one random access channel occasion group in the plurality of random access channel occasion groups are in two different slots.

26. transmitting a first random access response within a first time window in response to receiving the first preamble group; 26. The method of claim 14, wherein the first random access channel occasion group is used to determine a start of the first time window, and the first random access channel occasion group is used to determine a scrambling sequence for the first random access response.

27. A first node used for wireless communication, a first receiving set configured to receive a first synchronization signal block, the index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; a first transmission set configured to transmit a first preamble group, the first preamble group comprising a plurality of preambles, a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being used to transmit the plurality of preambles in the first preamble group, and any two random access channel occasions in the first random access channel occasion group being orthogonal in the time domain; and Equipped with a first node, wherein the plurality of candidate synchronization signal block indices are mapped to a plurality of random access channel occasion groups according to a first mapping order, 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 first occasion group type is one of a plurality of candidate occasion group types, and 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.

28. 28. The first node of claim 27, wherein any random access channel occasion group among the plurality of random access channel occasion groups is within a first time period.

29. 29. The first node of claim 27 or 28, wherein the first occasion group type comprises a first repetition factor, the quantity of random access channel occasions comprised in the first random access channel occasion group is equal to the value of the first repetition factor, and the first repetition factor is one of a plurality of repetition factors.

30. 30. The first node of claim 29, wherein any random access channel occasion group among 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 each comprising the plurality of repetition factors, the quantity of random access channel occasions comprised in a second random access channel occasion group equals the value of the repetition factor comprised in the candidate occasion group type corresponding to the second random access channel occasion group, and the second random access channel occasion group is any random access channel occasion group among the plurality of random access channel occasion groups.

31. 31. The first node of claim 27, wherein the first occasion group type comprises 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.

32. 32. The first node of claim 27, wherein the first occasion group type comprises a first frequency hopping pattern, and frequency domain resources occupied by any random access channel occasion in the first random access channel occasion group correspond to the first frequency hopping pattern.

33. 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; 33. The first node of claim 27, wherein the index of the first synchronization signal block is mapped to at least two random access channel occasion groups among the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups each corresponding 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.

34. 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; 33. The first node of claim 27, wherein 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.

35. The first mapping order is the following order: an ascending order of preamble indexes within one random access channel occasion group among the plurality of random access channel occasion groups; an ascending order of frequency domain resources for the plurality of random access channel occasion groups; and 35. The first node of claim 27, comprising one or more of an ascending order of time domain resources for the plurality of random access channel occasion groups.

36. 36. The first node of claim 35, wherein the first mapping order comprises: first, the ascending order of preamble indexes within a random access channel occasion group among the plurality of random access channel occasion groups; second, the ascending order of frequency domain resources for the plurality of random access channel occasion groups; and third, the ascending order of time domain resources for the plurality of random access channel occasion groups.

37. 37. The first node of claim 27, wherein the plurality of random access channel occasion groups comprises a plurality of random access channel occasions, and wherein each random access channel occasion among the plurality of random access channel occasion groups belongs to only one random access channel occasion group among the plurality of random access channel occasion groups, or each random access channel occasion is shared by at least two random access channel occasion groups among the plurality of random access channel occasion groups.

38. 38. The first node of claim 27, wherein at least two random access channel occasions in at least one random access channel occasion group in the plurality of random access channel occasion groups are in two different slots.

39. a second receiving set configured to receive a first random access response within a first time window in response to transmitting the first preamble group; 39. The first node of claim 27, wherein the first random access channel occasion group is used to determine the start of the first time window, and the first random access channel occasion group is used to determine a scrambling sequence for the first random access response.

40. a second node used for wireless communication, a first transmission set configured to transmit one or more synchronization signal blocks, the first synchronization signal block being one of the one or more synchronization signal blocks, and an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; a first receiving set configured to receive a first preamble group, the first preamble group comprising a plurality of preambles, a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being used to transmit the plurality of preambles in the first preamble group, and any two random access channel occasions in the first random access channel occasion group being orthogonal in the time domain; and Equipped with a second node, wherein the plurality of candidate synchronization signal block indices are mapped to a plurality of random access channel occasion groups according to a first mapping order, 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 first occasion group type is one of a plurality of candidate occasion group types, and 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.

41. 41. The second node of claim 40, wherein any random access channel occasion group among the plurality of random access channel occasion groups is within a first time period.

42. 42. The second node of claim 40 or 41, wherein the first occasion group type comprises a first repetition factor, the quantity of random access channel occasions comprised in the first random access channel occasion group is equal to the value of the first repetition factor, and the first repetition factor is one of a plurality of repetition factors.

43. 43. The second node of claim 42, wherein any random access channel occasion group among 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 each comprising the plurality of repetition factors, the quantity of random access channel occasions comprised in a second random access channel occasion group equals the value of the repetition factor comprised in the candidate occasion group type corresponding to the second random access channel occasion group, and the second random access channel occasion group is any random access channel occasion group among the plurality of random access channel occasion groups.

44. 44. The second node of claim 40, wherein the first occasion group type comprises a first frequency hopping indication, and wherein 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.

45. 45. The second node of claim 40, wherein the first occasion group type comprises a first frequency hopping pattern, and wherein frequency domain resources occupied by any random access channel occasion in the first random access channel occasion group correspond to the first frequency hopping pattern.

46. 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; 46. ​​The second node of claim 40, wherein the index of the first synchronization signal block is mapped to at least two random access channel occasion groups among the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups each corresponding 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.

47. 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; 46. ​​The second node of claim 40, wherein 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.

48. The first mapping order is the following order: an ascending order of preamble indexes within one random access channel occasion group among the plurality of random access channel occasion groups; an ascending order of frequency domain resources for the plurality of random access channel occasion groups; and 48. The second node of any one of claims 40 to 47, comprising one or more of an ascending order of time domain resources for the plurality of random access channel occasion groups.

49. 49. The second node of claim 48, wherein the first mapping order comprises, first, the ascending order of preamble indexes within a random access channel occasion group among the plurality of random access channel occasion groups, second, the ascending order of frequency domain resources for the plurality of random access channel occasion groups, and third, the ascending order of time domain resources for the plurality of random access channel occasion groups.

50. 50. The second node of claim 40, wherein the plurality of random access channel occasion groups comprises a plurality of random access channel occasions, and wherein each random access channel occasion among the plurality of random access channel occasion groups belongs to only one random access channel occasion group among the plurality of random access channel occasion groups, or each random access channel occasion is shared by at least two random access channel occasion groups among the plurality of random access channel occasion groups.

51. 51. The second node of claim 40, wherein at least two random access channel occasions in at least one random access channel occasion group in the plurality of random access channel occasion groups are in two different slots.

52. a second transmission set configured to transmit a first random access response within a first time window in response to receiving the first preamble group; 52. The second node of claim 40, wherein the first random access channel occasion group is used to determine the start of the first time window, and the first random access channel occasion group is used to determine a scrambling sequence for the first random access response.

53. 14. A first node used for wireless communication, comprising: a memory, a processor, and a transceiver, wherein the memory is configured to store a program, and the processor is configured to invoke the program in the memory to cause the first node to perform the method of any one of claims 1 to 13.

54. 27. A second node used for wireless communication, comprising: a memory, a processor, and a transceiver, wherein the memory is configured to store a program, and the processor is configured to invoke the program in the memory to cause the second node to perform the method of any one of claims 14 to 26.

55. 27. An apparatus comprising a processor configured to call a program from a memory to cause the apparatus to perform the method of any one of claims 1 to 26.

56. 27. A chip comprising a processor configured to call a program from a memory to cause a device to which the chip is attached to perform the method of any one of claims 1 to 26.

57. 27. A computer-readable storage medium storing a program that causes a computer to perform the method of any one of claims 1 to 26.

58. A computer program product comprising a program that causes a computer to carry out the method of any one of claims 1 to 26.

59. A computer program causing a computer to carry out the method of any one of claims 1 to 26.

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