Method and apparatus in a node for wireless communication

Abstract

The invention provides a method and an apparatus in a node for wireless communication. The method comprises the following steps: receiving a first synchronization signal block, wherein the index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes; sending a first preamble group, wherein the first preamble group comprises a plurality of preambles; the first random access channel timing unit comprises a plurality of random access channel opportunities, and the plurality of random access channel opportunities are respectively used for sending the plurality of preambles; any two random access channel opportunities in the first random access channel time unit are orthogonal in the time domain; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel time units according to a first mapping sequence, and the first random access channel time unit is one of the plurality of random access channel time units; the first random access channel time unit corresponds to a first time unit type; the index of the first synchronization signal block, the first time unit type and the first mapping order are used for determining the first random access channel time unit.

Description

Method and apparatus in a node for wireless communication Technical Field

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

[0002] In order to enhance the coverage performance of random access, some communication systems (e.g., new radio (NR) systems) plan to introduce a scheme based on multiple physical random access channels (PRACH) transmissions. However, in the scenario of multiple PRACH transmissions, the mapping method of the traditional synchronization signal block (Synchronization Signal / Physical Broadcast Channel block, SSB or SS / PBCH block) and random access occasion (RO, also known as PRACH Occasion) used for wireless communication may cause multiple random access occasions to overlap in the time domain, which not only brings higher requirements to the system configuration, but also increases the system processing complexity and the transmission power overhead; it may also cause a large time interval between multiple random access occasions, thereby increasing the access delay of the system; it may also reduce the utilization efficiency of random access resources; and it may also increase additional signaling overhead.

[0003] Summary of the Invention

[0004] In view of this, the embodiments of the present application are dedicated to providing a method and apparatus in a node for wireless communication. The various aspects involved in the present application are introduced below.

[0005] In a first aspect, a method is provided in a first node 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 indices; sending a first preamble group, the first preamble group including a plurality of preambles; a first random access channel opportunity group including a plurality of random access channel opportunities, the plurality of random access channel opportunities in the first random access channel opportunity group being respectively used to send the plurality of preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group being orthogonal in the time domain; wherein the plurality of candidate synchronization signal block indices are mapped to a plurality of random access channel opportunity groups according to a first mapping order, the first random access channel opportunity group being one of the plurality of random access channel opportunity groups; the first random access channel opportunity group corresponds to a first opportunity group type, the first opportunity group type being one of a plurality of candidate opportunity group types; the index of the first synchronization signal block, the first opportunity group type and the first mapping order are used to determine the first random access channel opportunity group.

[0006] In a second aspect, a method is provided in a second node for wireless communication, comprising: sending one or more synchronization signal blocks, a 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 indices; receiving a first preamble group, the first preamble group including a plurality of preambles; a first random access channel opportunity group including a plurality of random access channel opportunities, the plurality of random access channel opportunities in the first random access channel opportunity group being respectively used to send the plurality of preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group being orthogonal in the time domain; wherein the plurality of candidate synchronization signal block indices are mapped to a plurality of random access channel opportunity groups according to a first mapping order, the first random access channel opportunity group being one of the plurality of random access channel opportunity groups; the first random access channel opportunity group corresponds to a first opportunity group type, the first opportunity group type being one of a plurality of candidate opportunity group types; the index of the first synchronization signal block, the first opportunity group type and the first mapping order are used to determine the first random access channel opportunity group.

[0007] In a third aspect, a first node for wireless communication is provided, comprising: a first receiver for receiving a first synchronization signal block, the index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indices; a first transmitter for sending a first preamble group, the first preamble group including a plurality of preambles; a first random access channel opportunity group including a plurality of random access channel opportunities, the plurality of random access channel opportunities in the first random access channel opportunity group being respectively used to send the plurality of preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group are orthogonal in the time domain; wherein the plurality of candidate synchronization signal block indices are mapped to a plurality of random access channel opportunity groups according to a first mapping order, the first random access channel opportunity group being one of the plurality of random access channel opportunity groups; the first random access channel opportunity group corresponds to a first opportunity group type, the first opportunity group type being one of a plurality of candidate opportunity group types; the index of the first synchronization signal block, the first opportunity group type and the first mapping order are used to determine the first random access channel opportunity group.

[0008] In a fourth aspect, a second node for wireless communication is provided, comprising: a first transmitter, configured to send one or more synchronization signal blocks, the first synchronization signal block being one of the one or more synchronization signal blocks, and the index of the first synchronization signal block being one of multiple candidate synchronization signal block indices; a first receiver, configured to receive a first preamble group, the first preamble group including multiple preambles; a first random access channel opportunity group including multiple random access channel opportunities, the multiple random access channel opportunities in the first random access channel opportunity group being respectively used to send the multiple preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group are orthogonal in the time domain; wherein the multiple candidate synchronization signal block indices are mapped to multiple random access channel opportunity groups according to a first mapping order, the first random access channel opportunity group being one of the multiple random access channel opportunity groups; the first random access channel opportunity group corresponds to a first opportunity group type, the first opportunity group type being one of multiple candidate opportunity group types; the index of the first synchronization signal block, the first opportunity group type and the first mapping order are used to determine the first random access channel opportunity group.

[0009] In a fifth aspect, a first node for wireless communication is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the first node executes part or all of the steps in the method of the first aspect.

[0010] In the sixth aspect, a second node for wireless communication is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the second node executes part or all of the steps in the method of the second aspect.

[0011] In a seventh aspect, an embodiment of the present application provides a communication system, the system including the first node and / or the second node described above. In another possible design, the system may also include other devices that interact with the first node or the second node in the solution provided in the embodiment of the present application.

[0012] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program enables the first node or the second node to execute part or all of the steps in the methods of the above aspects.

[0013] In a ninth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a first node or a second node to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

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

[0015] In an embodiment of the present application, the first node can determine the first random access channel opportunity group corresponding to the first synchronization signal block based on the index of the first synchronization signal block, the first opportunity group type and the first mapping order, so that any two random access channel opportunities in the determined first random access channel opportunity group are orthogonal in the time domain, that is, any two random access channel opportunities in the first random access channel opportunity group do not overlap in the time domain.

[0016] In an embodiment of the present application, any two random access channel opportunities in the first random access channel opportunity group determined by the first node based on the index of the first synchronization signal block, the first opportunity group type, and the first mapping order do not overlap in the time domain. In an embodiment of the present application, by changing the mapping method between the synchronization signal block and the random access opportunity, any two random access channel opportunities in the first random access channel opportunity group do not overlap in the time domain, thereby reducing the requirements for system configuration, reducing system processing complexity, and saving transmission power overhead.

[0017] The mapping method of synchronization signal blocks and random access opportunities provided in the embodiment of the present application is conducive to ensuring that the time intervals between multiple random access channel opportunities in the determined first random access channel opportunity group are small, thereby helping to reduce the access delay of the system.

[0018] In addition, the mapping method of synchronization signal blocks and random access opportunities provided in the embodiments of the present application is conducive to improving the utilization efficiency of random access resources, or saving signaling overhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a diagram illustrating an example of a system architecture of a wireless communication system to which an embodiment of the present application may be applied.

[0020] FIG2 is an example diagram of the mapping relationship between synchronization signal blocks and random access channel opportunities.

[0021] FIG3 is a flow chart of a method for wireless communication provided in an embodiment of the present application.

[0022] FIG4 is an example diagram of the mapping relationship between synchronization signal blocks and random access channel opportunity groups provided in an embodiment of the present application.

[0023] FIG5 is an example diagram of the mapping relationship between synchronization signal blocks and random access channel opportunity groups provided by another embodiment of the present application.

[0024] FIG6 is an example diagram of the mapping relationship between synchronization signal blocks and random access channel opportunity groups provided in another embodiment of the present application.

[0025] FIG7 is a flowchart of a method for wireless communication provided in another embodiment of the present application.

[0026] FIG8 is a schematic structural diagram of the first node provided in an embodiment of the present application.

[0027] FIG9 is a schematic diagram of the structure of the second node provided in an embodiment of the present application.

[0028] FIG10 is a schematic structural diagram of a communication device provided in an embodiment of the present application.

[0029] FIG11 is a schematic diagram of the hardware modules of the communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0031] Communication system architecture

[0032] FIG1 is a diagram illustrating an exemplary system architecture of a wireless communication system 100 to which embodiments of the present application may be applied. The wireless communication system 100 may include a network device 110 and a user equipment (UE) 120. The network device 110 may be a device that communicates with the user equipment 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the user equipment 120 located within the coverage area.

[0033] FIG1 exemplarily shows a network device and two user devices. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include another number of user devices within its coverage area, which is not limited in the embodiments of the present application.

[0034] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0035] It should be understood that although the technical solutions of the embodiments of the present application are directed to random access, the technical solutions of the embodiments of the present application can also be used for beam failure recovery. Furthermore, although the technical solutions of the embodiments of the present application are directed to the Type-1 random access procedure, the technical solutions of the embodiments of the present application can also be used with the Type-2 random access procedure. Furthermore, although the technical solutions of the embodiments of the present application are directed to the Uu interface, the technical solutions of the embodiments of the present application can also be used with the PC5 interface. Furthermore, although the technical solutions of the embodiments of the present application are directed to single-carrier communication, the technical solutions of the embodiments of the present application can also be used for multi-carrier communication. Furthermore, although the technical solutions of the embodiments of the present application are directed to multi-antenna communication, the technical solutions of the embodiments of the present application can also be used for single-antenna communication. Furthermore, although the technical solutions of the embodiments of the present application are directed to the scenario of user equipment and base station, the technical solutions of the embodiments of the present application are also applicable to V2X scenarios, communication scenarios between user equipment and relay, and between relay and base station, achieving similar technical effects in the scenario of user equipment and base station. Furthermore, the technical solutions of the embodiments of the present application can be applied to various communication scenarios, such as enhanced mobile broadband (eMBB) scenarios, ultra-reliable and low-latency communication (URLLC) scenarios, and massive machine type communication (mMTC) scenarios. In addition, adopting a unified solution for different scenarios can also help reduce hardware complexity and costs.

[0036] It should be understood that, in the absence of conflict, the embodiments and features in the embodiments in the first node of the present application can be applied to the second node, and vice versa. In the absence of conflict, the embodiments and features in the embodiments of the present application can be arbitrarily combined with each other.

[0037] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0038] The user equipment in the embodiments of the present application may also be referred to as a terminal device, an access terminal, a user unit, a user station, a mobile station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The user equipment in the embodiments of the present application may refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects, and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The user equipment in the embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through the base station.

[0039] The network device in the embodiments of the present application may be a device for communicating with a user equipment, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects the user equipment to a wireless network. A base station can broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmission point (TRP), transmission point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. A base station can also refer to a communication module, a modem or a chip used to be set in the aforementioned device or apparatus. The base station can also be a mobile switching center and a device that performs base station functions in device-to-device D2D, vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. The base station can support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network equipment.

[0040] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0041] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include an AAU.

[0042] The network equipment and user equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water; can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and user equipment are located.

[0043] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0044] It should be understood that the interpretation of the terminology in the embodiments of the present application can refer to the 3GPP specification protocols TS36 series, TS37 series and TS38 series, but can also refer to the specification protocols of the Institute of Electrical and Electronics Engineers (IEEE).

[0045] Coverage enhancement of PRACH transmission

[0046] The coverage performance of a communication system (e.g., a NR system) is an important factor that operators need to consider when commercially deploying communication networks. This is because the coverage performance of a communication system directly affects the service quality of the communication system and the operator's costs, such as the operator's capital expenditure (CAPEX) and operating expense (OPEX).

[0047] The coverage performance of a communication system varies depending on the frequency band in which it operates. For example, compared to LTE, NR systems operate at higher frequencies (e.g., millimeter wave bands), resulting in greater path loss and, consequently, poorer coverage. Therefore, as communication systems support increasingly higher frequency bands, enhancing coverage becomes a pressing issue.

[0048] In most actual deployment scenarios, uplink coverage is a bottleneck for enhancing communication system coverage, as user equipment capabilities are weaker than those of network equipment. However, with the advancement of communication technology, uplink traffic is increasing in emerging vertical use cases, such as video uploading. In scenarios with high uplink traffic, enhancing uplink coverage is a challenge that needs further resolution.

[0049] In related technologies, coverage enhancement solutions already exist for certain uplink channels. For example, NR Release 17 (Rel-17) has designed coverage enhancement solutions for the physical uplink shared channel (PUSCH), the physical uplink control channel (PUCCH), and message 3 (Msg3) in the random access procedure.

[0050] However, Rel-17 did not design a coverage enhancement solution for PRACH. However, PRACH transmission performance is very important for many processes such as initial access and beam failure recovery. Therefore, PRACH coverage enhancement is also very important. Based on this, Rel-18 formally established the "further NR coverage enhancements" work item (WI), among which enhancing the coverage performance of PRACH transmission is one of the key topics of this work item.

[0051] As a possible implementation, multiple PRACH transmissions may be used to enhance PRACH transmission coverage. In other words, PRACH transmission coverage enhancement may be achieved by repeated PRACH transmissions (eg, sending a preamble multiple times in the PRACH).

[0052] In an embodiment of the present application, multiple PRACH transmissions may refer to multiple PRACH transmissions using the same beam, or may refer to multiple PRACH transmissions using different beams. Taking multiple PRACH transmissions using the same beam as an example, the 3rd Generation Partnership Project (3GPP) Radio Access Network (RAN) 1#110bis-e meeting has reached an agreement: at least PRACH opportunities (or RACH opportunities) at different time instances can be used for multiple PRACH transmissions using the same beam. In addition, the RAN1#110bis-e meeting further defined the repetition factor (the number / number of multiple PRACH transmissions) for multiple PRACH transmissions using the same beam, which may include at least 2 and 4, and may subsequently include 8.

[0053] Correlation mapping between synchronization signal blocks and PRACH opportunities

[0054] A synchronization signal block is a signal structure defined in a communication standard, which 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 an SSB (synchronization signal block). In some embodiments, the synchronization signal block may also be represented as an SS / PBCH block (synchronization signal / physical broadcast channel 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. It should be noted that the following text will use the synchronization signal block represented as an SSB as an example for introduction. Of course, the SSB in the following text may be replaced by the SS / PBCH block.

[0055] SSB is a set of resources transmitted on a basic orthogonal frequency division multiplexing grid. The set of resources may include, for example, one or more of the following resources: time domain resources, frequency domain resources, code domain resources, etc.

[0056] During the initial access or beam failure recovery process of the user equipment, when the user equipment detects the SSB sent by the network device, it can obtain the SSB index of the SSB, thereby knowing the time domain location of the SSB, so as to achieve downlink synchronization with the network device. In order to achieve uplink synchronization, the user equipment needs to send a preamble to the network device. How the user equipment selects the preamble to be sent and at which PRACH opportunity the selected preamble should be sent are determined by the user equipment based on the received (or detected) SSB.

[0057] As a feasible technical solution, SSB can be associated and mapped with at least one preamble in at least one PRACH opportunity, so that when the user equipment performs initial access or beam failure recovery, it can determine the associated PRACH opportunity and preamble based on the received SSB, so that PRACH transmission can continue.

[0058] In the related art, the association mapping relationship between SSB and PRACH opportunities and preambles follows the following order: first, arrange in ascending order of the preamble index within each PRACH opportunity; second, arrange the frequency-division multiplexed PRACH opportunities in ascending order of the frequency domain resource index; third, arrange the time-division multiplexed PRACH opportunities within each PRACH time slot in ascending order of the time domain resource index; finally, arrange in ascending order of the PRACH time slot index.

[0059] An example of the association mapping relationship between SSB and PRACH opportunities is given below in conjunction with Figure 2. In the example of Figure 2, assuming there are 8 SSB beams, the SSB indexes corresponding to the 8 SSB beams are SSB0-SSB7; assuming that the value of the SSB-perRACH-Occasion parameter sent by the network device to the user equipment is 1 / 2; assuming that the number of frequency-division multiplexed PRACH opportunities sent by the network device to the user equipment is 4, then the PRACH opportunity corresponding to the SSB is shown in Figure 2, where each box in the figure represents a PRACH opportunity.

[0060] As mentioned above, PRACH coverage can be enhanced through multiple PRACH transmissions. In the scenario of multiple PRACH transmissions, if the above-mentioned association mapping relationship is used to determine multiple PRACH opportunities associated with SSBs, it may cause multiple PRACH opportunities associated with the same SSB to overlap in the time domain, thereby increasing the transmission power overhead of the device.

[0061] In addition, in the scenario of multiple PRACH transmissions using the same beam, if the above-mentioned association mapping relationship is used to determine multiple PRACH timings associated with SSBs, it will also conflict with the time-domain orthogonal PRACH timing scheme for multiple PRACH transmissions reached at the RAN1#110-bis-e meeting.

[0062] In summary, in a multi-PRACH transmission scenario, how to determine multiple PRACH timings associated with the SSB based on the SSB is a problem that needs to be solved.

[0063] In order to solve the above problems, an embodiment of the present application provides a method and apparatus in a node for wireless communication, which can effectively associate and map SSB to multiple time-domain orthogonal PRACH opportunities, thereby helping to save transmission power overhead.

[0064] The embodiments of the present application can be applied to scenarios with multiple PRACH transmissions, that is, multiple PRACH repeated transmissions can be used to achieve PRACH coverage enhancement.

[0065] In some embodiments, the multi-PRACH transmission mentioned in the embodiments of the present application may refer to multi-PRACH transmission using the same beam, so as to obtain a signal-to-noise ratio (SNR) gain by repeatedly transmitting multiple PRACHs on the same beam. In some embodiments, the multi-PRACH transmission mentioned in the embodiments of the present application may refer to multi-PRACH transmission using different beams, so as to obtain a diversity gain by repeatedly transmitting multiple PRACHs on different beams.

[0066] It should be noted that the beam mentioned in the embodiments of the present application can be replaced by other terms such as antenna port, spatial filter, spatial parameter, etc., and the meanings expressed can be consistent. The embodiments of the present application do not distinguish between them.

[0067] The embodiments of the present application can be applied to the initial access process or the beam failure recovery process. Taking the initial access process as an example, the embodiments of the present application can be applied to a four-step random access procedure (i.e., random access procedure type 1, type-1 random access procedure), or can also be applied to a two-step random access procedure (i.e., random access procedure type 2), and the embodiments of the present application are not limited to this.

[0068] The following is a detailed description of the method embodiment of the present application in conjunction with the accompanying drawings. Figure 3 is a flow chart of a method in a node for wireless communication provided in an embodiment of the present application. The method shown in Figure 3 is described from the perspective of the interaction between the first node and the second node.

[0069] As an embodiment, the first node may be a network-controlled repeater (NCR).

[0070] As an embodiment, the first node may be a user equipment, for example, the user equipment 120 shown in FIG1 .

[0071] As an embodiment, the first node may be a relay, such as a relay terminal.

[0072] As an embodiment, the second node may be a network device, for example, the network device 110 shown in FIG. 2 .

[0073] The method shown in FIG3 may include step S310 and step S320 , which are described below.

[0074] In step S310, the first node receives a first synchronization signal block.

[0075] The index of the first synchronization signal block is one of multiple candidate synchronization signal block indices.

[0076] As an embodiment, the first synchronization signal block may be one of one or more synchronization signal blocks sent by the second node.

[0077] As an embodiment, a synchronization signal block (for example, a first synchronization signal block, one or more synchronization signal blocks sent by a second node, etc.) can be represented as an SSB; or, the synchronization signal block can be represented as an SS / PBCH block, which is not limited in this embodiment of the present application.

[0078] As an embodiment, the index of the first synchronization signal block is mapped to a first random access channel opportunity group. The first random access channel opportunity group includes multiple random access channel opportunities.

[0079] As an embodiment, the multiple random access channel occasions included in the first random access channel occasion group may be expressed as RO (RACH occasion) or PRO (PRACH occasion), which is not limited in the embodiment of the present application.

[0080] In step S320, the first node sends a first preamble group. The first preamble group includes multiple preambles. In some embodiments, the preamble may also be called a preamble code, which is not limited in the embodiments of the present application.

[0081] The multiple random access channel opportunities in the first random access channel opportunity group are respectively used to send the multiple preambles in the first preamble group. That is, the multiple preambles in the first preamble group can be sent on multiple random access channel opportunities in the first random access channel opportunity group, for example, each preamble is sent on a random access channel opportunity.

[0082] Any two random access channel opportunities in the first random access channel opportunity group are orthogonal in the time domain. In this way, any two random access channel opportunities in the first random access channel opportunity group will not overlap in the time domain, that is, the multiple random access channel opportunities associated with the first synchronization signal block are non-overlapping in the time domain.

[0083] As an embodiment, any random access channel opportunity in the first random access channel opportunity group is valid. For example, for a paired spectrum or a supplementary uplink frequency band, all random access channel opportunities may be valid. Alternatively, for an unpaired spectrum, a random access channel opportunity may be valid if certain conditions are met, such as the condition associated with the parameter tdd-UL-DL-ConfigurationCommon.

[0084] As an embodiment, the multiple candidate synchronization signal block indexes described above may be mapped to multiple random access channel opportunity groups according to a first mapping order, where the first random access channel opportunity group is one of the multiple random access channel opportunity groups. How the multiple candidate synchronization signal block indexes are mapped to the multiple random access channel opportunity groups according to the first mapping order will be described in detail later and will not be described in detail here.

[0085] As an embodiment, any random access channel opportunity group among the multiple random access channel opportunity groups includes at least one random access channel opportunity. Taking the multiple random access channel opportunity groups including the first random access channel opportunity group as an example, the first random access channel opportunity group may include at least one random access channel opportunity.

[0086] As an embodiment, any random access channel opportunity group among the multiple random access channel opportunity groups includes multiple (two or more) random access channel opportunities. For example, the first random access channel opportunity group may include multiple random access channel opportunities.

[0087] As an embodiment, any two random access channel opportunities included in any random access channel opportunity group in the multiple random access channel opportunity groups are orthogonal in the time domain.

[0088] As an embodiment, any two random access channel opportunities are orthogonal in the time domain, which can be understood as any two random access channel opportunities being distributed at different time instances. In some embodiments, the time instance can also be replaced by other terms such as time intervals, which is not limited in the embodiments of the present application.

[0089] As an embodiment, any random access channel opportunity group among the multiple random access channel opportunity groups is valid. For example, for paired spectrum or supplementary uplink frequency band, all random access channel opportunity groups may be valid. Alternatively, for unpaired spectrum, the random access channel opportunity group may also be valid if certain conditions are met, such as the condition that may be associated with the parameter tdd-UL-DL-ConfigurationCommon.

[0090] As an embodiment, one or more random access channel opportunities included in any random access channel opportunity group among the multiple random access channel opportunity groups are valid.

[0091] In one embodiment, at least two random access channel opportunities in at least one random access channel opportunity group among the multiple random access channel opportunity groups belong to two different time slots. For example, the first cycle includes three random access channel time slots (PRACH slots), and one or more random access channel opportunity groups among the multiple random access channel opportunity groups may occupy two or three of the three PRACH time slots.

[0092] As an embodiment, all random access channel opportunities included in any random access channel opportunity group in multiple random access channel opportunity groups are located in the same time slot, that is, all random access channel opportunities included in any random access channel opportunity group in multiple random access channel opportunity groups are located in the same PRACH time slot.

[0093] As an embodiment, any random access channel opportunity group among multiple random access channel opportunity groups may include multiple preambles. In this way, after the first node determines the random access channel opportunity group corresponding to the first synchronization signal block based on the index of the received (detected) first synchronization signal block (which may be any random access channel opportunity group among the multiple random access channel opportunity groups), it can send a preamble on the random access channel opportunity group.

[0094] As an embodiment, for any random access channel opportunity group among multiple random access channel opportunity groups, the preamble indexes included in any random access channel opportunity in the random access channel opportunity group may all be the same. Taking the first random access channel opportunity group among the multiple random access channel opportunity groups as an example, the preamble indexes included in the multiple random access channel opportunities included in the first random access channel opportunity group may all be the same. For example, the preamble indexes included in the multiple random access channel opportunities included in the first random access channel opportunity group may all be in the range of 0-63.

[0095] As an embodiment, for any random access channel opportunity group among multiple random access channel opportunity groups, the preamble indexes included in any random access channel opportunity in the random access channel opportunity group may be different or partially different. Still taking the first random access channel opportunity group among the multiple random access channel opportunity groups as an example, the preamble indexes included in the multiple random access channel opportunities included in the first random access channel opportunity group may be different. For example, the first random access channel opportunity group includes four random access channel opportunities, and the preamble indexes included in these four random access channel opportunities may range from 0 to 63, 64 to 127, 128 to 191, and 192 to 255, respectively.

[0096] In one embodiment, the first random access channel opportunity group corresponds to a first opportunity group type, that is, the first random access channel opportunity group corresponds to the first opportunity group type. The first opportunity group type is one of multiple candidate opportunity group types. The first opportunity group type and / or the candidate opportunity group type may include various information, such as a repetition factor, a frequency hopping indicator, a frequency hopping pattern, etc., which will be described in detail later with reference to specific examples and will not be described in detail here.

[0097] In an embodiment of the present application, the index of the first synchronization signal block, the first timing group type and the first mapping order can be used to determine the first random access channel timing group. In this way, after the first node receives the first synchronization signal block, it can determine the first random access channel timing group corresponding to the first synchronization signal block based on the index of the first synchronization signal block, the first timing group type and the first mapping order, and the first random access channel timings contained in the first random access channel timing group determined by the first node based on the index of the first synchronization signal block, the first timing group type and the first mapping order are orthogonal in the time domain. Furthermore, the first node sends multiple preambles in the first preamble group on multiple random access channel timings of the first random access channel timing group, which can reduce random access delay and improve random access resource utilization efficiency.

[0098] As an embodiment, the index of the first synchronization signal block, the first opportunity group type and the first mapping order are used to determine the first random access channel opportunity group from a plurality of random access channel opportunity groups.

[0099] As an embodiment, the index of the first synchronization signal block, the first opportunity group type and the first mapping order are used to determine the first random access channel opportunity group from a plurality of random access channel opportunity groups included in the first period.

[0100] As an embodiment, the index of the first synchronization signal block, the first timing group type and the first mapping order are used to determine any random access channel opportunity in the first random access channel timing group from a plurality of random access channel opportunities included in the first period.

[0101] The embodiments of the present application do not specifically limit the implementation method for determining the first random access channel opportunity group using the index of the first synchronization signal block, the first opportunity group type, and the first mapping order. As long as the first random access channel opportunity group corresponding to the first synchronization signal block can be determined by combining the above three types of information, it will be sufficient. In other words, the embodiments of the present application can filter out the first random access channel opportunity group from multiple random access channel opportunity groups using the above three types of information. The following examples illustrate several implementation methods for determining the first random access channel opportunity group using the index of the first synchronization signal block, the first opportunity group type, and the first mapping order.

[0102] As an embodiment, the index of the first synchronization signal block, the first timing group type and the first mapping order are used to determine the first random access channel timing group, including: according to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel timing groups among a plurality of random access channel timing groups, the at least two random access channel timing groups respectively corresponding to at least two different candidate timing group types, and the first timing group type is used to determine the first random access channel timing group from the at least two random access channel timing groups.

[0103] As an embodiment, the index of the first synchronization signal block, the first timing group type and the first mapping order are used to determine the first random access channel timing group, including: the first timing group type is used to determine at least L random access channel timing groups from multiple random access channel timing groups, the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel timing group from the at least L random access channel timing groups, and L is a positive integer greater than 1.

[0104] As an embodiment, L is one of {4, 8, 64}.

[0105] As an embodiment, any random access channel opportunity group among the multiple random access channel opportunity groups belongs to the first period.

[0106] As an embodiment, the first cycle can be understood as a mapping cycle of synchronization signal blocks and random access channel opportunities.

[0107] As an embodiment, the first period may include one or more PRACH time slots. Taking the case where the first period includes multiple PRACH time slots as an example, the embodiment of the present application does not limit the number of multiple PRACH time slots included in the first period. For example, it may include 3 PRACH time slots, 4 PRACH time slots, or a larger number of PRACH time slots.

[0108] As an embodiment, any random access channel opportunity in any random access channel opportunity group in the multiple random access channel opportunity groups belongs to one of the multiple PRACH time slots included in the first period.

[0109] As an embodiment, the first cycle includes the multiple random access channel opportunity groups mentioned above. That is, mapping the multiple candidate synchronization signal block indices to the multiple random access channel opportunity groups according to the first mapping order is performed within the first cycle.

[0110] As an embodiment, the first period includes multiple random access channel opportunities.

[0111] In one embodiment, any random access channel opportunity in the multiple random access channel opportunity groups is one of the multiple random access channel opportunities included in the first period. In other words, one or more of the multiple random access channel opportunities included in the first period can constitute any random access channel opportunity group in the multiple random access channel opportunity groups.

[0112] As an embodiment, multiple candidate synchronization signal block indexes are mapped to multiple random access channel opportunity groups according to the first mapping order, which may mean that multiple candidate synchronization signal block indexes are mapped to multiple random access channel opportunity groups in the first period according to the first mapping order.

[0113] As an embodiment, multiple candidate synchronization signal block indices are mapped to multiple random access channel opportunity groups according to a first mapping order, which may mean that multiple candidate synchronization signal block indices are mapped to multiple random access channel opportunities in a first period according to the first mapping order.

[0114] As an embodiment, any candidate synchronization signal block index among multiple candidate synchronization signal block indexes can be mapped to at least one random access channel opportunity group in the first period.

[0115] As an embodiment, any candidate synchronization signal block index among multiple candidate synchronization signal block indices can be mapped to at least one random access channel opportunity in the first period.

[0116] As an embodiment, mapping of multiple candidate synchronization signal block indexes to multiple random access channel opportunity groups is performed within the first cycle.

[0117] As an embodiment, the first period may refer to a PRACH configuration period.

[0118] As an embodiment, the first period may refer to an association period for mapping multiple candidate synchronization signal block indices to multiple random access channel opportunity groups.

[0119] As an embodiment, the first period may refer to an association pattern period including one or more association periods.

[0120] As an embodiment, the first period of mapping multiple candidate synchronization signal block indices to multiple random access channel opportunity groups is the minimum value in the set determined by the PRACH configuration period.

[0121] As an embodiment, the set of PRACH configuration period determinations can be referred to Table 1, that is, the value of the first period can be determined according to Table 1.

[0122] Table 1

[0123] As an embodiment, the first period may start from frame number 0.

[0124] As mentioned above, the index of the first synchronization signal block, the first timing group type and the first mapping order are used to determine the first random access channel timing group. The first timing group type and the first mapping order are introduced below.

[0125] The first opportunity group type may include one or more of the following information: a first repetition factor, a first frequency hopping indication, and a first frequency hopping pattern.

[0126] As an embodiment, the first opportunity group type may include one of the above information, for example, only the first repetition factor, or only the first frequency hopping indication, or only the first frequency hopping pattern.

[0127] As an embodiment, the first opportunity group type may include multiple types of the above information, such as the first repetition factor and the first frequency hopping indication, or the first repetition factor and the first frequency hopping pattern; or the first repetition factor, the first frequency hopping indication and the first frequency hopping pattern, etc.

[0128] As an embodiment, the first timing group type may include not only one or more of the above information but also other information, which is not limited in this embodiment of the present application.

[0129] In one embodiment, the first opportunity group type may include a first repetition factor, and the number of all random access channel opportunities included in the first random access channel opportunity group is equal to the first repetition factor. Taking the first repetition factor as 4 as an example, the number of random access channel opportunities included in the first random access channel opportunity group is 4, that is, the first random access channel opportunity group includes 4 random access channel opportunities.

[0130] As an embodiment, the first repetition factor is a positive integer. For example, the first repetition factor can be any positive integer, such as 2, 4, 8, 16, and so on.

[0131] As an embodiment, the first repetition factor may include values ​​that are predefined by the protocol or configured by the network.

[0132] As an example, the first repetition factor may be one of 2 and 4.

[0133] As an example, the first repetition factor may be one of 2, 4, and 8.

[0134] As an example, the first repetition factor may be one of 1, 2, 4, and 8.

[0135] As an embodiment, the multiple repetition factors are not equal.

[0136] As an embodiment, the first repetition factor is one of a plurality of repetition factors. The plurality of repetition factors may refer to repetition factors of multiple PRACH transmissions, that is, the number of repetitions of PRACH transmissions.

[0137] As an embodiment, the multiple repetition factors may include at least 2 and 4. For example, the multiple repetition factors may include only 2 and 4; or, the multiple repetition factors may include 2, 4, and other positive integers.

[0138] As an example, the multiple repetition factors may include 2, 4, and 8.

[0139] As an example, the multiple repetition factors may include 1, 2, and 4.

[0140] As an example, the multiple repetition factors may include 1, 2, 4, and 8.

[0141] As an example, the multiple repetition factors may be 2 and 4 respectively.

[0142] As an example, the multiple repetition factors may be 2, 4 and 8 respectively.

[0143] As an example, the multiple repetition factors may be 1, 2, and 4, respectively.

[0144] As an example, the multiple repetition factors may be 1, 2, 4 and 8 respectively.

[0145] In one embodiment, the number of all random access channel opportunities included in any random access channel opportunity group in the multiple random access channel opportunity groups is equal to one of the multiple repetition factors. Taking the multiple repetition factors as an example, any random access channel opportunity group in the multiple random access channel opportunity groups includes either 2 random access channel opportunities or 4 random access channel opportunities.

[0146] As an embodiment, the multiple candidate timing group types may include a first candidate timing group type and a second candidate timing group type, where the first candidate timing group type is different from the second candidate timing group type.

[0147] As an embodiment, that the first candidate timing group type is different from the second candidate timing group type may include: a repetition factor included in the first candidate timing group type is different from a repetition factor included in the second candidate timing group type.

[0148] As an embodiment, when the first opportunity group type belongs to different candidate opportunity group types, the first repetition factor included in the first opportunity group type is different. For example, when the first opportunity group type is the first candidate opportunity group type, the first repetition factor is one of the multiple repetition factors described above; when the first opportunity group type is the second candidate opportunity group type, the first repetition factor is another repetition factor among the multiple repetition factors except the repetition factor included in the first candidate opportunity group type. As a specific example, when the first opportunity group type is the first candidate opportunity group type, the first repetition factor may be 2; when the first opportunity group type is the second candidate opportunity group type, the first repetition factor may be 4.

[0149] In one embodiment, any random access channel opportunity group in the multiple random access channel opportunity groups corresponds to one of the multiple candidate opportunity group types. For example, the multiple random access channel opportunity groups include four random access channel opportunity groups, namely A, B, C, and D. The candidate opportunity group types include a first candidate opportunity group type and a second candidate opportunity group type, wherein random access channel opportunity group A and random access channel opportunity group B correspond to the first candidate opportunity group type, and random access channel opportunity group C and random access channel opportunity group D correspond to the second candidate opportunity group type.

[0150] As an embodiment, multiple candidate opportunity group types respectively include the multiple repetition factors. Taking the multiple repetition factors including 2 and 4 as an example, the first candidate opportunity group type among the multiple candidate opportunity group types may include a repetition factor of 2, and the second candidate opportunity group type may include a repetition factor of 4.

[0151] As an embodiment, the number of all random access channel opportunities included in the second random access channel opportunity group is equal to the repetition factor included in a candidate opportunity group type corresponding to the second random access channel opportunity group, wherein the second random access channel opportunity group is any random access channel opportunity group among multiple random access channel opportunity groups. Exemplarily, if the candidate opportunity group type corresponding to the second random access channel opportunity group is the first candidate opportunity group type, and the first candidate opportunity group type includes a repetition factor of 2, then the number of random access channel opportunities included in the second random access channel opportunity group is equal to 2; if the candidate opportunity group type corresponding to the second random access channel opportunity group is the second candidate opportunity group type, and the second candidate opportunity group type includes a repetition factor of 4, then the number of random access channel opportunities included in the second random access channel opportunity group is equal to 4.

[0152] In one embodiment, the multiple candidate opportunity group types respectively include the multiple repetition factors, and the number of all random access channel opportunities included in any random access channel opportunity group in the multiple random access channel opportunity groups is equal to one of the multiple repetition factors. For example, the number of all random access channel opportunities included in any random access channel opportunity group in the multiple random access channel opportunity groups can be equal to one of 1, 2, 4, and 8.

[0153] In one embodiment, the first opportunity group type may include a first frequency hopping indicator. The first frequency hopping indicator may be used to determine whether the frequency domain resources occupied by at least two random access channel opportunities in the first random access channel opportunity group are different. Alternatively, the first frequency hopping indicator may be used to determine whether the frequency domain resources occupied by at least two random access channel opportunities in the first random access channel opportunity group are the same.

[0154] As an embodiment, the multiple candidate timing group types may include a first candidate timing group type and a second candidate timing group type, where the first candidate timing group type is different from the second candidate timing group type.

[0155] As an embodiment, that the first candidate timing group type is different from the second candidate timing group type may include: a frequency hopping indicator included in the first candidate timing group type is different from a frequency hopping indicator included in the second candidate timing group type.

[0156] In one embodiment, when the first opportunity group type belongs to different candidate opportunity group types, the first frequency hopping indicator included in the first opportunity group type is different. For example, when the first opportunity group type is the first candidate opportunity group type, the first frequency hopping indicator may be used to indicate that all random access channel opportunities in the first random access channel opportunity group occupy the same frequency domain resources; when the first opportunity group type is the second candidate opportunity group type, the first frequency hopping indicator may be used to indicate that at least two random access channel opportunities in the first random access channel opportunity group occupy different frequency domain resources.

[0157] As an embodiment, the first opportunity group type may include a first frequency hopping pattern. The first frequency hopping pattern is used to determine the frequency domain resources occupied by any random access channel opportunity in the first random access channel opportunity group.

[0158] As an embodiment, the frequency domain resources occupied by any random access channel opportunity in the first random access channel opportunity group correspond to the first frequency hopping pattern.

[0159] As an embodiment, the multiple candidate timing group types may include a first candidate timing group type and a second candidate timing group type, where the first candidate timing group type is different from the second candidate timing group type.

[0160] As an embodiment, that the first candidate timing group type is different from the second candidate timing group type may include: a frequency hopping pattern included in the first candidate timing group type is different from a frequency hopping pattern included in the second candidate timing group type.

[0161] As an embodiment, when the first opportunity group type belongs to different candidate opportunity group types, the first frequency hopping patterns included in the first opportunity group type are different. For example, when the first opportunity group type belongs to the first candidate opportunity group type, the first frequency hopping pattern included in the first opportunity group type is frequency hopping pattern A; when the first opportunity group type belongs to the second candidate opportunity group type, the first frequency hopping pattern included in the first opportunity group type is frequency hopping pattern B, where the frequency hopping pattern A and the frequency hopping pattern B are at least partially different.

[0162] As an embodiment, the multiple candidate opportunity group types may respectively include multiple frequency hopping patterns. The frequency domain resources occupied by any random access channel opportunity group in the multiple random access channel opportunity groups correspond to a frequency hopping pattern in the multiple frequency hopping patterns.

[0163] As an embodiment, any random access channel opportunity group among a plurality of random access channel opportunity groups corresponds to one of a plurality of candidate opportunity group types, and the plurality of candidate opportunity group types respectively include a plurality of frequency hopping spectra, and the frequency domain resources occupied by any random access channel opportunity group among the plurality of random access channel opportunity groups correspond to a frequency hopping spectrum among the plurality of frequency hopping spectra.

[0164] As an embodiment, the first opportunity group type is one of multiple candidate opportunity group types. Therefore, the multiple candidate opportunity group types may include one or more of the following information: a repetition factor, a frequency hopping indicator, and a frequency hopping map. The specific content of the information included in the multiple candidate opportunity group types is similar to the information included in the first opportunity group type. For a detailed description, please refer to the previous description of the information included in the first opportunity group type. For the sake of brevity, it is not repeated here.

[0165] In the embodiment of the present application, multiple random access channel opportunities are divided into multiple random access channel opportunity groups using multiple candidate opportunity group types (eg, multiple repetition factors), so that the number of random access channel opportunities occupied by multiple PRACH transmissions is variable.

[0166] The first mapping order is described in detail below.

[0167] As an embodiment, the first mapping order is associated with one or more of the following information: a preamble index within a random access channel opportunity group, frequency domain resources of multiple random access channel opportunity groups, and time domain resources of multiple random access channel opportunity groups.

[0168] As an embodiment, the first mapping order may include: according to the change order of the preamble index in one random access channel opportunity group among the multiple random access channel opportunity groups, such as the order of increasing preamble index or the order of decreasing preamble index, etc. In other words, the multiple candidate synchronization signal block indices may be arranged according to the change order (for example, increasing order) of the preamble index in one random access channel opportunity group among the multiple random access channel opportunity groups.

[0169] As an embodiment, the first mapping order may include: according to the change order of the frequency domain resources of the multiple random access channel opportunity groups, such as the order of increasing frequency domain resources or the order of decreasing frequency domain resources. In other words, the multiple candidate synchronization signal block indexes may be arranged for the multiple random access channel opportunity groups using frequency division multiplexing according to the change order of the frequency domain resources of the multiple random access channel opportunity groups (for example, in increasing order).

[0170] As an embodiment, the first mapping order may include: according to the change order of the time domain resources of the multiple random access channel opportunity groups, such as the order of increasing time domain resources or the order of decreasing time domain resources. In other words, the multiple candidate synchronization signal block indexes may be arranged according to the change order (for example, increasing order) of the time domain resources of the multiple random access channel opportunity groups for time division multiplexing.

[0171] As an embodiment, the first mapping order may include one or more of the following orders: an order according to the increasing order of the leading index within a random access channel opportunity group among multiple random access channel opportunity groups; an order according to the increasing order of the frequency domain resources of multiple random access channel opportunity groups; and an order according to the increasing order of the time domain resources of multiple random access channel opportunity groups.

[0172] As an embodiment, the first mapping order may include: first, according to the ascending order of the leading index within a random access channel opportunity group among multiple random access channel opportunity groups; second, according to the ascending order of the frequency domain resources of multiple random access channel opportunity groups; and third, according to the ascending order of the time domain resources of multiple random access channel opportunity groups.

[0173] However, the embodiments of the present application are not limited thereto. The above-mentioned orders included in the first mapping order may be randomly arranged or combined, and the order thereof may also be swapped. For example, the first mapping order may include: first, in ascending order of the preamble index within a random access channel opportunity group among the multiple random access channel opportunity groups; second, in ascending order of the time domain resources of the multiple random access channel opportunity groups; third, in ascending order of the frequency domain resources of the multiple random access channel opportunity groups, and so on.

[0174] As an embodiment, multiple random access channel opportunity groups may include multiple random access channel opportunities, and each of the multiple random access channel opportunities included in the multiple random access channel opportunity groups may belong to only one random access channel opportunity group among the multiple random access channel opportunity groups. In other words, the multiple random access channel opportunity groups do not overlap, that is, the resources occupied by the multiple random access channel opportunity groups (e.g., random access channel opportunities) do not overlap.

[0175] 4 , an example is given below in which each random access channel opportunity in a plurality of random access channel opportunities belongs to only one random access channel opportunity group.

[0176] As shown in FIG4 , it is assumed that the multiple repetition factors included in the multiple candidate opportunity group types are 1, 2, and 4, respectively, where 4 is the maximum repetition factor Qmax, or in other words, the maximum repetition factor Qmax of the multiple PRACH transmissions is 4. As an implementation manner, in a first period, all random access channel opportunities in the first period may be sequentially divided into multiple random access channel opportunity groups according to the multiple repetition factors included in the multiple candidate opportunity group types.

[0177] In the example of FIG. 4 , all random access channel opportunities in the first cycle are divided into multiple random access channel opportunity groups in descending order of multiple repetition factors included in multiple candidate opportunity group types.

[0178] In the example of FIG4 , each dotted box represents a random access channel opportunity group, and the random access channel opportunity group is divided in descending order according to a plurality of repetition factors (1, 2, and 4).

[0179] In the example of FIG4 , the multiple random access channel opportunity groups include multiple random access channel opportunities. Any random access channel opportunity included in the multiple random access channel opportunity groups belongs to only one random access channel opportunity group. For example, random access channel opportunity 1 (RO1 in the figure) belongs to only one random access channel (ROG1 in the figure), random access channel opportunity 8 (RO8 in the figure) belongs to only one random access channel (ROG2 in the figure), and so on.

[0180] In the example of FIG4 , the multiple random access channel opportunity groups include multiple random access channel opportunities. For each random access channel opportunity included in the multiple random access channel opportunity groups, different candidate synchronization signal block indexes are mapped to different preambles among the multiple preambles included in each random access channel opportunity. For example, taking random access channel opportunity 1 as an example, candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are both mapped to random access channel opportunity 1, but candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are mapped to different preambles in random access channel opportunity 1. For example, candidate synchronization signal block index 0 is mapped to preambles 0-21 in random access channel opportunity 1, and candidate synchronization signal block index 1 is mapped to preambles 22-43 in random access channel opportunity 1.

[0181] As an embodiment, the multiple random access channel opportunity groups may include multiple random access channel opportunities, and each of the multiple random access channel opportunities included in the multiple random access channel opportunity groups may be shared by at least two random access channel opportunity groups in the multiple random access channel opportunity groups. In other words, the resources occupied by the multiple random access channel opportunity groups (e.g., random access channel opportunities) may overlap.

[0182] 5 , an example is given below in which each random access channel opportunity in a plurality of random access channel opportunity groups is shared by at least two random access channel opportunity groups in a plurality of random access channel opportunity groups.

[0183] As shown in FIG5 , it is assumed that the multiple repetition factors included in the multiple candidate opportunity group types are 1, 2, and 4, respectively, where 4 is the maximum repetition factor Qmax, or in other words, the maximum repetition factor Qmax of the multiple PRACH transmissions is 4. As an implementation manner, in the first period, all random access channel opportunities in the first period may be divided into multiple random access channel opportunity groups according to the multiple repetition factors included in the multiple candidate opportunity group types.

[0184] In the example of FIG5 , all random access channel opportunities in the first period are divided into multiple random access channel opportunity groups according to multiple repetition factors included in multiple candidate opportunity group types.

[0185] In the example of FIG5 , each dotted box represents a random access channel opportunity group, which is divided according to multiple repetition factors (1, 2, and 4). The dotted ellipse and the dotted square represent random access channel opportunity groups divided according to different repetition factors. For example, the dotted ellipse represents a random access channel opportunity group divided according to a repetition factor of 4, and the dotted square represents a random access channel opportunity group divided according to a repetition factor of 2.

[0186] In the example of FIG5 , the multiple random access channel opportunity groups include multiple random access channel opportunities. Any random access channel opportunity included in the multiple random access channel opportunity groups is shared by at least two random access channel opportunity groups in the multiple random access channel opportunity groups. For example, random access channel opportunity 1 (RO1 in the figure) is shared by two random access channel opportunity groups (ROG1 and ROG7 in the figure), random access channel opportunity 8 (RO8 in the figure) is shared by two random access channel opportunity groups (ROG2 and ROG8 in the figure), and so on.

[0187] In the example of FIG5 , the multiple random access channel opportunity groups include multiple random access channel opportunities. For each random access channel opportunity included in the multiple random access channel opportunity groups, at least two random access channel opportunity groups that share the random access channel opportunity are mapped to different preambles among the multiple preambles included in the random access channel opportunity. For example, taking random access channel opportunity 1 as an example, random access channel opportunity group 1 and random access channel opportunity group 7 share random access channel opportunity 1 and are both mapped to random access channel opportunity 1, but random access channel opportunity group 1 and random access channel opportunity group 7 are mapped to different preambles in random access channel opportunity 1. For example, random access channel opportunity group 1 is mapped to preambles 0-21 in random access channel opportunity 1, and random access channel opportunity group 7 is mapped to preambles 22-43 in random access channel opportunity 1.

[0188] Figure 6 shows another example where each random access channel opportunity in a plurality of random access channel opportunities is shared by at least two random access channel opportunity groups in a plurality of random access channel opportunity groups. The solution of Figure 6 can be understood as a combination (or hybrid) of the implementations shown in Figures 4 and 5 .

[0189] As shown in FIG6 , it is assumed that the multiple candidate opportunity group types include multiple repetition factors of 1, 2, and 4, respectively, where 4 is the maximum repetition factor Qmax, or in other words, the maximum repetition factor Qmax of the multi-PRACH transmission is 4. As an implementation, within a first period, all random access channel opportunities within the first period can be first divided into multiple random access channel opportunity groups according to the multiple repetition factors included in the multiple candidate opportunity group types (i.e., first divided into multiple random access channel opportunity groups according to the implementation shown in FIG4 ). Then, for the random access channel opportunity groups whose preambles have not been fully used in the multiple random access channel opportunity groups, the random access channel opportunity groups whose preambles have not been fully used are divided a second time, and the candidate opportunity group types (e.g., repetition factors) corresponding to the two divisions are different. For example, the second division can be performed according to the implementation shown in FIG5 .

[0190] In the example of Figure 6, each dotted box represents a random access channel opportunity group, wherein the dotted elliptical box represents a plurality of random access channel opportunity groups obtained by first dividing in sequence according to a plurality of repetition factors included in a plurality of candidate opportunity group types, and the dotted square box represents a random access channel opportunity group obtained by secondary division of the random access channel opportunity group that has not been used up in the preamble.

[0191] In the example of FIG6 , the multiple random access channel opportunity groups include multiple random access channel opportunities. Any random access channel opportunity included in the multiple random access channel opportunity groups may belong to only one random access channel opportunity group, or may be shared by at least two random access channel opportunity groups in the multiple random access channel opportunity groups. For example, random access channel opportunity 1 (RO1 in the figure) belongs only to random access channel opportunity group 1 (ROG1 in the figure), random access channel opportunity 13 (RO13 in the figure) is shared by two random access channel opportunity groups (ROG4 and ROG12 in the figure), and so on.

[0192] In the example of FIG6 , the multiple random access channel opportunity groups include multiple random access channel opportunities. For each random access channel opportunity included in the multiple random access channel opportunity groups, if the random access channel opportunity belongs to only one random access channel opportunity group, different candidate synchronization signal block indexes can be mapped to different preambles among the multiple preambles included in each random access channel opportunity. For example, taking random access channel opportunity 1 as an example, candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are both mapped to random access channel opportunity 1, but candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are mapped to different preambles in random access channel opportunity 1. For example, candidate synchronization signal block index 0 is mapped to preambles 0-21 in random access channel opportunity 1, and candidate synchronization signal block index 1 is mapped to preambles 22-43 in random access channel opportunity 1. If the random access channel opportunity is shared by at least two random access channel opportunity groups, the at least two random access channel opportunity groups that share the random access channel opportunity can be mapped to different preambles among the multiple preambles included in the random access channel opportunity. For example, taking random access channel opportunity 13 as an example, random access channel opportunity group 4 and random access channel opportunity group 12 share random access channel opportunity 13, and both are mapped to random access channel opportunity 13, but random access channel opportunity group 4 and random access channel opportunity group 12 are mapped to different preambles in random access channel opportunity 13, for example, random access channel opportunity group 4 is mapped to preambles 0-21 in random access channel opportunity 13, and random access channel opportunity group 12 is mapped to preambles 22-43 in random access channel opportunity 13.

[0193] Figure 7 is a flow chart of a method in a node for wireless communication provided by another embodiment of the present application. The method shown in Figure 7 may include steps S710 to S730.

[0194] In step S710, the first node receives a first synchronization signal block.

[0195] In step S720, the first node sends a first preamble group.

[0196] For the relevant description of step S710 and step S720, please refer to the above description of step S310 and step S320, which will not be repeated here.

[0197] In step S730 , in response to sending the first preamble group, the first node receives a first random access response within a first time window.

[0198] As an embodiment, the first random access channel opportunity group may be used to determine one or more of the following: determining a start of a first time window, and determining a scrambling sequence of a first random access response.

[0199] As a specific embodiment, the first random access channel opportunity group is used to start the first time window.

[0200] As another specific embodiment, the first random access channel opportunity group is used for the start of the first time window and a scrambling sequence of the first random access response.

[0201] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 7 . The device embodiment of the present application is described in detail below in conjunction with Figures 8 to 10 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0202] FIG8 is a schematic diagram of the structure of a first node according to an embodiment of the present application. The first node 800 shown in FIG8 may include a first receiver 810 and a first transmitter 820.

[0203] The first receiver 810 can be used to receive a first synchronization signal block, the index of which is one of multiple candidate synchronization signal block indices.

[0204] The first transmitter 820 can be used to send a first preamble group, the first preamble group includes multiple preambles; the first random access channel opportunity group includes multiple random access channel opportunities, and the multiple random access channel opportunities in the first random access channel opportunity group are respectively used to send the multiple preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group are orthogonal in the time domain; wherein the multiple candidate synchronization signal block indexes are mapped to multiple random access channel opportunity groups according to a first mapping order, and the first random access channel opportunity group is one of the multiple random access channel opportunity groups; the first random access channel opportunity group corresponds to a first opportunity group type, and the first opportunity group type is one of multiple candidate opportunity group types; the index of the first synchronization signal block, the first opportunity group type and the first mapping order are used to determine the first random access channel opportunity group.

[0205] As an embodiment, any random access channel opportunity group among the multiple random access channel opportunity groups belongs to the first period.

[0206] As an embodiment, the first opportunity group type includes a first repetition factor, the number of random access channel opportunities included in the first random access channel opportunity group is equal to the first repetition factor, and the first repetition factor is one of multiple repetition factors.

[0207] As an embodiment, any random access channel opportunity group among the multiple random access channel opportunity groups corresponds to one of the multiple candidate opportunity group types; the multiple candidate opportunity group types respectively include the multiple repetition factors, and the number of random access channel opportunities included in the second random access channel opportunity group is equal to the repetition factor included in the candidate opportunity group type corresponding to the second random access channel opportunity group, wherein the second random access channel opportunity group is any random access channel opportunity group among the multiple random access channel opportunity groups.

[0208] As an embodiment, the first opportunity group type includes a first frequency hopping indication; the first frequency hopping indication is used to determine whether frequency domain resources occupied by at least two random access channel opportunities in the first random access channel opportunity group are different.

[0209] As an embodiment, the first opportunity group type includes a first frequency hopping pattern; and the frequency domain resources occupied by any random access channel opportunity in the first random access channel opportunity group correspond to the first frequency hopping pattern.

[0210] As an embodiment, the index of the first synchronization signal block, the first timing group type and the first mapping order are used to determine the first random access channel timing group, including: according to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel timing groups among the multiple random access channel timing groups, the at least two random access channel timing groups respectively correspond to at least two different candidate timing group types, and the first timing group type is used to determine the first random access channel timing group from the at least two random access channel timing groups.

[0211] As an embodiment, the index of the first synchronization signal block, the first timing group type and the first mapping order are used to determine the first random access channel timing group, including: the first timing group type is used to determine at least L random access channel timing groups from the multiple random access channel timing groups, the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel timing group from the at least L random access channel timing groups, and L is a positive integer greater than 1.

[0212] As an embodiment, the first mapping order includes one or more of the following orders: in an ascending order of the leading index within a random access channel opportunity group among the multiple random access channel opportunity groups; in an ascending order of the frequency domain resources of the multiple random access channel opportunity groups; in an ascending order of the time domain resources of the multiple random access channel opportunity groups.

[0213] As an embodiment, the first mapping order includes: first, according to the ascending order of the leading index within a random access channel opportunity group among the multiple random access channel opportunity groups; second, according to the ascending order of the frequency domain resources of the multiple random access channel opportunity groups; and again, according to the ascending order of the time domain resources of the multiple random access channel opportunity groups.

[0214] As an embodiment, the multiple random access channel opportunity groups include multiple random access channel opportunities, and each random access channel opportunity among the multiple random access channel opportunity groups includes only one random access channel opportunity group among the multiple random access channel opportunity groups; or each random access channel opportunity is shared by at least two random access channel opportunity groups among the multiple random access channel opportunity groups.

[0215] As an embodiment, at least two random access channel opportunities in at least one random access channel opportunity group among the multiple random access channel opportunity groups belong to two different time slots.

[0216] As an embodiment, the first node 800 also includes: a second receiver, used to receive a first random access response within a first time window as a response to sending the first preamble group; wherein the first random access channel opportunity group is used to determine the start of the first time window; the first random access channel opportunity group is used to determine the scrambling sequence of the first random access response.

[0217] As an embodiment, the first receiver 810 and the first transmitter 820 may be a transceiver 1030. The first node 800 may further include a processor 1010 and a memory 1020, as specifically shown in FIG10 .

[0218] FIG9 is a schematic diagram of the structure of a second node provided in an embodiment of the present application. The second node 900 shown in FIG9 may include a first transmitter 910 and a first receiver 920.

[0219] The first transmitter 910 can be used to send 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 multiple candidate synchronization signal block indices.

[0220] The first receiver 920 can be used to receive a first preamble group, the first preamble group includes multiple preambles; the first random access channel opportunity group includes multiple random access channel opportunities, and the multiple random access channel opportunities in the first random access channel opportunity group are respectively used to transmit the multiple preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group are orthogonal in the time domain; wherein the multiple candidate synchronization signal block indexes are mapped to multiple random access channel opportunity groups according to a first mapping order, and the first random access channel opportunity group is one of the multiple random access channel opportunity groups; the first random access channel opportunity group corresponds to a first opportunity group type, and the first opportunity group type is one of multiple candidate opportunity group types; the index of the first synchronization signal block, the first opportunity group type and the first mapping order are used to determine the first random access channel opportunity group.

[0221] As an embodiment, any random access channel opportunity group among the multiple random access channel opportunity groups belongs to the first period.

[0222] As an embodiment, the first opportunity group type includes a first repetition factor, the number of random access channel opportunities included in the first random access channel opportunity group is equal to the first repetition factor, and the first repetition factor is one of multiple repetition factors.

[0223] As an embodiment, any random access channel opportunity group among the multiple random access channel opportunity groups corresponds to one of the multiple candidate opportunity group types; the multiple candidate opportunity group types respectively include the multiple repetition factors, and the number of random access channel opportunities included in the second random access channel opportunity group is equal to the repetition factor included in the candidate opportunity group type corresponding to the second random access channel opportunity group, wherein the second random access channel opportunity group is any random access channel opportunity group among the multiple random access channel opportunity groups.

[0224] As an embodiment, the first opportunity group type includes a first frequency hopping indication; the first frequency hopping indication is used to determine whether frequency domain resources occupied by at least two random access channel opportunities in the first random access channel opportunity group are different.

[0225] As an embodiment, the first opportunity group type includes a first frequency hopping pattern; and the frequency domain resources occupied by any random access channel opportunity in the first random access channel opportunity group correspond to the first frequency hopping pattern.

[0226] As an embodiment, the index of the first synchronization signal block, the first timing group type and the first mapping order are used to determine the first random access channel timing group, including: according to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel timing groups among the multiple random access channel timing groups, the at least two random access channel timing groups respectively correspond to at least two different candidate timing group types, and the first timing group type is used to determine the first random access channel timing group from the at least two random access channel timing groups.

[0227] As an embodiment, the index of the first synchronization signal block, the first timing group type and the first mapping order are used to determine the first random access channel timing group, including: the first timing group type is used to determine at least L random access channel timing groups from the multiple random access channel timing groups, the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel timing group from the at least L random access channel timing groups, and L is a positive integer greater than 1.

[0228] As an embodiment, the first mapping order includes one or more of the following orders: in an ascending order of the leading index within a random access channel opportunity group among the multiple random access channel opportunity groups; in an ascending order of the frequency domain resources of the multiple random access channel opportunity groups; in an ascending order of the time domain resources of the multiple random access channel opportunity groups.

[0229] As an embodiment, the first mapping order includes: first, according to the ascending order of the leading index within a random access channel opportunity group among the multiple random access channel opportunity groups; second, according to the ascending order of the frequency domain resources of the multiple random access channel opportunity groups; and again, according to the ascending order of the time domain resources of the multiple random access channel opportunity groups.

[0230] As an embodiment, the multiple random access channel opportunity groups include multiple random access channel opportunities, and each random access channel opportunity among the multiple random access channel opportunity groups includes only one random access channel opportunity group among the multiple random access channel opportunity groups; or each random access channel opportunity is shared by at least two random access channel opportunity groups among the multiple random access channel opportunity groups.

[0231] As an embodiment, at least two random access channel opportunities in at least one random access channel opportunity group among the multiple random access channel opportunity groups belong to two different time slots.

[0232] As an embodiment, the second node 900 includes: a second transmitter, used to send a first random access response within a first time window as a response to receiving the first preamble group; wherein the first random access channel opportunity group is used to determine the start of the first time window; the first random access channel opportunity group is used to determine the scrambling sequence of the first random access response.

[0233] As an embodiment, the first transmitter 910 and the first receiver 920 may be a transceiver 1030. The second node 900 may further include a processor 1010 and a memory 1020, as specifically shown in FIG10 .

[0234] Figure 10 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 10 indicate that the unit or module is optional. The device 1000 may be used to implement the method described in the above method embodiment. The device 1000 may be a chip, user equipment, or network equipment.

[0235] The device 1000 may include one or more processors 1010. The processor 1010 may support the device 1000 to implement the method described in the method embodiment 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 other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0236] The apparatus 1000 may further include one or more memories 1030. The memories 1030 store programs that can be executed by the processor 1010, causing the processor 1010 to perform the methods described in the above method embodiments. The memories 1030 may be independent of the processor 1010 or integrated into the processor 1010.

[0237] The apparatus 1000 may further include a transceiver 1030. The processor 1010 may communicate with other devices or chips via the transceiver 1030. For example, the processor 1010 may transmit and receive data with other devices or chips via the transceiver 1030.

[0238] To facilitate understanding, the hardware modules of the communication devices of the first node and the second node are briefly introduced below.

[0239] 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.

[0240] 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 .

[0241] 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 .

[0242] During transmission from the second communications device 410 to the first communications device 450, at the second communications device 410, upper layer data packets from the core network or from a data source 477 are provided to a controller / processor 475. The core network and data source 477 represent all protocol layers above the L2 layer. The controller / processor 475 implements L2 layer functionality. During transmission from the second communications device 410 to the first communications device 450, the controller / processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communications device 450 based on various priority metrics. The controller / processor 475 is also responsible for retransmission of lost packets and signaling to the first communications device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 416 performs coding and interleaving to facilitate forward error correction at the second communication device 410, as well as mapping signal constellations based on various modulation schemes (e.g., binary phase shift keying, quadrature phase shift keying, M-phase shift keying, and M-quadrature amplitude modulation). The multi-antenna transmit processor 471 performs digital spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming on the coded and modulated symbols to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to a subcarrier, multiplexes it with a reference signal (e.g., a pilot) in the time and / or frequency domain, and then uses an inverse fast Fourier transform to generate a physical channel carrying the time-domain multicarrier symbol stream. The multi-antenna transmit processor 471 then performs transmit analog precoding / beamforming operations on the time-domain multicarrier symbol stream. Each transmitter 418 converts the baseband multicarrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream, which is then provided to a different antenna 420.

[0243] During transmission from the second communication device 410 to the first communication device 450, each receiver 454 at the first communication device 450 receives a signal via its corresponding antenna 452. Each receiver 454 recovers the information modulated onto the RF carrier and converts the RF stream into a baseband multi-carrier symbol stream, which is provided to the receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 implement various L1 layer signal processing functions. The multi-antenna receive processor 458 performs receive analog precoding / beamforming operations on the baseband multi-carrier symbol stream from the receiver 454. The receive processor 456 uses a fast Fourier transform to convert the baseband multi-carrier symbol stream subjected to the receive analog precoding / beamforming operations from the time domain to the frequency domain. In the frequency domain, the receive processor 456 demultiplexes the physical layer data signal and reference signal, where the reference signal is used for channel estimation. The data signal undergoes multi-antenna detection in the multi-antenna receive processor 458 to recover any spatial streams destined for the first communication device 450. The 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 implements the functions of the L2 layer. The controller / processor 459 may be associated with a memory 460 that stores program code and data. The memory 460 may be referred to as a computer-readable medium. During transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover the upper layer data packets from the second communication device 410. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 layer for L3 processing.

[0244] During transmission from the first communications device 450 to the second communications device 410, upper layer data packets are provided to the controller / processor 459 at the first communications device 450 using a data source 467. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmission functionality at the second communications device 410 described in the transmission from the second communications device 410 to the first communications device 450, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, implementing L2 layer functions for both the user plane and the control plane. The controller / processor 459 is also responsible for retransmission of lost packets and signaling to the second communications device 410. The transmit processor 468 performs modulation mapping and channel coding, while the multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming. The transmit processor 468 then modulates the resulting spatial stream into a multi-carrier / single-carrier symbol stream. After analog precoding and beamforming operations in the multi-antenna transmit processor 457, the stream is provided to different antennas 452 via the transmitter 454. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a RF symbol stream before providing it to the antenna 452.

[0245] During transmission from the first communication device 450 to the second communication device 410, the functionality at the second communication device 410 is similar to the reception functionality 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 RF signals via its corresponding antenna 420, converts the received RF signals into 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 collectively implement the L1 layer functionality. The controller / processor 475 implements the L2 layer functionality. The controller / processor 475 may be associated with a memory 476 storing program code and data. The memory 476 may be referred to as a computer-readable medium. During transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover upper layer data packets from the first communication device 450. The controller / processor 475 may provide upper layer data packets to the core network or all protocol layers above the L2 layer, and may also provide various control signals to the core network or L3 for L3 processing.

[0246] As an embodiment, the first communication device 450 apparatus includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor, and the first communication device 450 apparatus at least: receives a first synchronization signal block, the index of the first synchronization signal block is one of multiple candidate synchronization signal block indices; sends a first preamble group, the first preamble group includes multiple preambles; a first random access channel opportunity group includes multiple random access channel opportunities, the multiple random access channel opportunities in the first random access channel opportunity group are respectively used to send the multiple preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group are orthogonal in the time domain; wherein the multiple candidate synchronization signal block indices are mapped to multiple random access channel opportunity groups according to a first mapping order, the first random access channel opportunity group is one of the multiple random access channel opportunity groups; the first random access channel opportunity group corresponds to a first opportunity group type, the first opportunity group type is one of multiple candidate opportunity group types; the index of the first synchronization signal block, the first opportunity group type and the first mapping order are used to determine the first random access channel opportunity group.

[0247] As an embodiment, the first communication device 450 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, the action including: receiving a first synchronization signal block, the index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indices; sending a first preamble group, the first preamble group including a plurality of preambles; a first random access channel opportunity group including a plurality of random access channel opportunities, the plurality of random access channel opportunities in the first random access channel opportunity group being respectively used to send the plurality of preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group being orthogonal in the time domain; wherein the plurality of candidate synchronization signal block indices are mapped to a plurality of random access channel opportunity groups according to a first mapping order, the first random access channel opportunity group being one of the plurality of random access channel opportunity groups; the first random access channel opportunity group corresponds to a first opportunity group type, the first opportunity group type being one of a plurality of candidate opportunity group types; the index of the first synchronization signal block, the first opportunity group type, and the first mapping order are used to determine the first random access channel opportunity group.

[0248] As an embodiment, the first communication device 450 corresponds to the first node in this application.

[0249] As an embodiment, the second communication device 410 corresponds to the second node in this application.

[0250] As an embodiment, the first communication device 450 is a UE.

[0251] As an embodiment, the first communication device 450 is a user equipment supporting V2X.

[0252] As an embodiment, the first communication device 450 is a user equipment supporting D2D.

[0253] As an embodiment, the first communication device 450 is a network control relay.

[0254] As an embodiment, the first communication device 450 is a relay.

[0255] As an embodiment, the second communication device 410 is a base station.

[0256] As an embodiment, the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456, and the controller / processor 459 are used to receive the first synchronization signal block in the present application.

[0257] As an embodiment, the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416, and the controller / processor 475 are used to send 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.

[0258] As an embodiment, the antenna 452, the transmitter 454, the multi-antenna transmit processor 457, the transmit processor 468, and the controller / processor 459 are used to transmit the first preamble group in this application.

[0259] As an embodiment, the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470, and the controller / processor 475 are configured to receive the first preamble group in this application.

[0260] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0261] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0262] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0263] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0264] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0265] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0266] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0267] In the embodiments of the present application, "pre-defined" or "pre-configured" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., including a user device and a network device). The present application does not limit the specific implementation method. For example, pre-defined may refer to information defined in a protocol.

[0268] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0269] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0270] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0271] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0272] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0273] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0274] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0275] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method in a first node for wireless communication, characterized in that include: 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; sending a first preamble group, the first preamble group including a plurality of preambles; a first random access channel opportunity group including a plurality of random access channel opportunities, the plurality of random access channel opportunities in the first random access channel opportunity group being respectively used to send the plurality of preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group being orthogonal in the time domain; Among them, the multiple candidate synchronization signal block indexes are mapped to multiple random access channel time groups according to a first mapping order, and the first random access channel time group is one of the multiple random access channel time groups; the first random access channel time group corresponds to a first time group type, and the first time group type is one of multiple candidate time group types; the index of the first synchronization signal block, the first time group type and the first mapping order are used to determine the first random access channel time group.

2. The method according to claim 1, characterized in that Any random access channel opportunity group among the multiple random access channel opportunity groups belongs to the first period.

3. The method according to claim 1 or 2, characterized in that: The first opportunity group type includes a first repetition factor, the number of random access channel opportunities included in the first random access channel opportunity group is equal to the first repetition factor, and the first repetition factor is one of multiple repetition factors.

4. The method according to claim 3, characterized in that Any random access channel opportunity group among the multiple random access channel opportunity groups corresponds to one of the multiple candidate opportunity group types; the multiple candidate opportunity group types respectively include the multiple repetition factors, and the number of random access channel opportunities included in the second random access channel opportunity group is equal to the repetition factor included in the candidate opportunity group type corresponding to the second random access channel opportunity group, wherein the second random access channel opportunity group is any random access channel opportunity group among the multiple random access channel opportunity groups.

5. The method according to any one of claims 1 to 4, characterized in that The first opportunity group type includes a first frequency hopping indication; the first frequency hopping indication is used to determine whether frequency domain resources occupied by at least two random access channel opportunities in the first random access channel opportunity group are different.

6. The method according to any one of claims 1 to 5, characterized in that The first opportunity group type includes a first frequency hopping spectrum; and frequency domain resources occupied by any random access channel opportunity in the first random access channel opportunity group correspond to the first frequency hopping spectrum.

7. The method according to any one of claims 1 to 6, characterized in that The index of the first synchronization signal block, the first opportunity group type, and the first mapping order are used to determine the first random access channel opportunity group, including: According to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel opportunity groups among the multiple random access channel opportunity groups, the at least two random access channel opportunity groups respectively correspond to at least two different candidate opportunity group types, and the first opportunity group type is used to determine the first random access channel opportunity group from the at least two random access channel opportunity groups.

8. The method according to any one of claims 1 to 6, characterized in that The index of the first synchronization signal block, the first opportunity group type, and the first mapping order are used to determine the first random access channel opportunity group, including: The first timing group type is used to determine at least L random access channel timing groups from the multiple random access channel timing groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel timing group from the at least L random access channel timing groups, where L is a positive integer greater than 1.

9. The method according to any one of claims 1 to 8, characterized in that The first mapping order includes one or more of the following orders: in an increasing order of preamble index within a random access channel opportunity group among the plurality of random access channel opportunity groups; According to the increasing order of frequency domain resources of the plurality of random access channel opportunity groups; In the order of increasing time domain resources of the multiple random access channel opportunity groups.

10. The method according to claim 9, characterized in that The first mapping order includes: first, according to the ascending order of the leading index within a random access channel opportunity group among the multiple random access channel opportunity groups; second, according to the ascending order of the frequency domain resources of the multiple random access channel opportunity groups; and third, according to the ascending order of the time domain resources of the multiple random access channel opportunity groups.

11. The method according to any one of claims 1 to 10, characterized in that The multiple random access channel opportunity groups include multiple random access channel opportunities, each random access channel opportunity among the multiple random access channel opportunity groups included in the multiple random access channel opportunity groups belongs to only one random access channel opportunity group among the multiple random access channel opportunity groups; or each random access channel opportunity is shared by at least two random access channel opportunity groups among the multiple random access channel opportunity groups.

12. The method according to any one of claims 1 to 11, characterized in that At least two random access channel opportunities in at least one random access channel opportunity group among the multiple random access channel opportunity groups belong to two different time slots.

13. The method according to any one of claims 1 to 12, characterized in that include: receiving, in response to sending the first preamble group, a first random access response within a first time window; The first random access channel opportunity group is used to determine the start of the first time window; and the first random access channel opportunity group is used to determine a scrambling sequence of the first random access response.

14. A method in a second node for wireless communication, characterized in that: include: Sending 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 including a plurality of preambles; a first random access channel opportunity group including a plurality of random access channel opportunities, the plurality of random access channel opportunities in the first random access channel opportunity group being respectively used to transmit the plurality of preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group being orthogonal in the time domain; Among them, the multiple candidate synchronization signal block indexes are mapped to multiple random access channel time groups according to a first mapping order, and the first random access channel time group is one of the multiple random access channel time groups; the first random access channel time group corresponds to a first time group type, and the first time group type is one of multiple candidate time group types; the index of the first synchronization signal block, the first time group type and the first mapping order are used to determine the first random access channel time group.

15. The method according to claim 14, characterized in that Any random access channel opportunity group among the multiple random access channel opportunity groups belongs to the first period.

16. The method according to claim 14 or 15, characterized in that The first opportunity group type includes a first repetition factor, the number of random access channel opportunities included in the first random access channel opportunity group is equal to the first repetition factor, and the first repetition factor is one of multiple repetition factors.

17. The method according to claim 16, characterized in that Any random access channel opportunity group among the multiple random access channel opportunity groups corresponds to one of the multiple candidate opportunity group types; the multiple candidate opportunity group types respectively include the multiple repetition factors, and the number of random access channel opportunities included in the second random access channel opportunity group is equal to the repetition factor included in the candidate opportunity group type corresponding to the second random access channel opportunity group, wherein the second random access channel opportunity group is any random access channel opportunity group among the multiple random access channel opportunity groups.

18. The method according to any one of claims 14 to 17, characterized in that: The first opportunity group type includes a first frequency hopping indication; the first frequency hopping indication is used to determine whether frequency domain resources occupied by at least two random access channel opportunities in the first random access channel opportunity group are different.

19. The method according to any one of claims 14 to 18, characterized in that: The first opportunity group type includes a first frequency hopping spectrum; and frequency domain resources occupied by any random access channel opportunity in the first random access channel opportunity group correspond to the first frequency hopping spectrum.

20. The method according to any one of claims 14 to 19, characterized in that The index of the first synchronization signal block, the first opportunity group type, and the first mapping order are used to determine the first random access channel opportunity group, including: According to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel opportunity groups among the multiple random access channel opportunity groups, the at least two random access channel opportunity groups respectively correspond to at least two different candidate opportunity group types, and the first opportunity group type is used to determine the first random access channel opportunity group from the at least two random access channel opportunity groups.

21. The method according to any one of claims 14 to 19, characterized in that The index of the first synchronization signal block, the first opportunity group type, and the first mapping order are used to determine the first random access channel opportunity group, including: The first timing group type is used to determine at least L random access channel timing groups from the multiple random access channel timing groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel timing group from the at least L random access channel timing groups, where L is a positive integer greater than 1.

22. The method according to any one of claims 14 to 21, characterized in that The first mapping order includes one or more of the following orders: in an increasing order of preamble index within a random access channel opportunity group among the plurality of random access channel opportunity groups; According to the increasing order of frequency domain resources of the plurality of random access channel opportunity groups; In the order of increasing time domain resources of the multiple random access channel opportunity groups.

23. The method according to claim 22, characterized in that The first mapping order includes: first, according to the ascending order of the leading index within a random access channel opportunity group among the multiple random access channel opportunity groups; second, according to the ascending order of the frequency domain resources of the multiple random access channel opportunity groups; and third, according to the ascending order of the time domain resources of the multiple random access channel opportunity groups.

24. The method according to any one of claims 14 to 23, characterized in that The multiple random access channel opportunity groups include multiple random access channel opportunities, each random access channel opportunity among the multiple random access channel opportunity groups included in the multiple random access channel opportunity groups belongs to only one random access channel opportunity group among the multiple random access channel opportunity groups; or each random access channel opportunity is shared by at least two random access channel opportunity groups among the multiple random access channel opportunity groups.

25. The method according to any one of claims 14 to 24, characterized in that At least two random access channel opportunities in at least one random access channel opportunity group among the multiple random access channel opportunity groups belong to two different time slots.

26. The method according to any one of claims 14 to 25, characterized in that include: sending, in response to receiving the first preamble group, a first random access response within a first time window; The first random access channel opportunity group is used to determine the start of the first time window; and the first random access channel opportunity group is used to determine a scrambling sequence of the first random access response.

27. A first node for wireless communication, characterized in that: include: A first receiver, configured to receive a first synchronization signal block, wherein the index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes; a first transmitter, configured to send a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel opportunity group comprising a plurality of random access channel opportunities, the plurality of random access channel opportunities in the first random access channel opportunity group being respectively used to send the plurality of preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group being orthogonal in the time domain; Among them, the multiple candidate synchronization signal block indexes are mapped to multiple random access channel time groups according to a first mapping order, and the first random access channel time group is one of the multiple random access channel time groups; the first random access channel time group corresponds to a first time group type, and the first time group type is one of multiple candidate time group types; the index of the first synchronization signal block, the first time group type and the first mapping order are used to determine the first random access channel time group.

28. The first node according to claim 27, characterized in that Any random access channel opportunity group among the multiple random access channel opportunity groups belongs to the first period.

29. The first node according to claim 27 or 28, characterized in that: The first opportunity group type includes a first repetition factor, the number of random access channel opportunities included in the first random access channel opportunity group is equal to the first repetition factor, and the first repetition factor is one of multiple repetition factors.

30. The first node according to claim 29, characterized in that Any random access channel opportunity group among the multiple random access channel opportunity groups corresponds to one of the multiple candidate opportunity group types; the multiple candidate opportunity group types respectively include the multiple repetition factors, and the number of random access channel opportunities included in the second random access channel opportunity group is equal to the repetition factor included in the candidate opportunity group type corresponding to the second random access channel opportunity group, wherein the second random access channel opportunity group is any random access channel opportunity group among the multiple random access channel opportunity groups.

31. The first node according to any one of claims 27 to 30, characterized in that: The first opportunity group type includes a first frequency hopping indication; the first frequency hopping indication is used to determine whether frequency domain resources occupied by at least two random access channel opportunities in the first random access channel opportunity group are different.

32. The first node according to any one of claims 27 to 31, characterized in that: The first opportunity group type includes a first frequency hopping spectrum; and frequency domain resources occupied by any random access channel opportunity in the first random access channel opportunity group correspond to the first frequency hopping spectrum.

33. The first node according to any one of claims 27 to 32, characterized in that: The index of the first synchronization signal block, the first opportunity group type, and the first mapping order are used to determine the first random access channel opportunity group, including: According to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel opportunity groups among the multiple random access channel opportunity groups, the at least two random access channel opportunity groups respectively correspond to at least two different candidate opportunity group types, and the first opportunity group type is used to determine the first random access channel opportunity group from the at least two random access channel opportunity groups.

34. The first node according to any one of claims 27 to 32, characterized in that: The index of the first synchronization signal block, the first opportunity group type, and the first mapping order are used to determine the first random access channel opportunity group, including: The first timing group type is used to determine at least L random access channel timing groups from the multiple random access channel timing groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel timing group from the at least L random access channel timing groups, where L is a positive integer greater than 1.

35. The first node according to any one of claims 27 to 34, characterized in that: The first mapping order includes one or more of the following orders: in an increasing order of preamble index within a random access channel opportunity group among the plurality of random access channel opportunity groups; According to the increasing order of frequency domain resources of the plurality of random access channel opportunity groups; In the order of increasing time domain resources of the multiple random access channel opportunity groups.

36. The first node according to claim 35, characterized in that The first mapping order includes: first, according to the ascending order of the leading index within a random access channel opportunity group among the multiple random access channel opportunity groups; second, according to the ascending order of the frequency domain resources of the multiple random access channel opportunity groups; and third, according to the ascending order of the time domain resources of the multiple random access channel opportunity groups.

37. The first node according to any one of claims 27 to 36, characterized in that: The multiple random access channel opportunity groups include multiple random access channel opportunities, each random access channel opportunity among the multiple random access channel opportunity groups included in the multiple random access channel opportunity groups belongs to only one random access channel opportunity group among the multiple random access channel opportunity groups; or each random access channel opportunity is shared by at least two random access channel opportunity groups among the multiple random access channel opportunity groups.

38. The first node according to any one of claims 27 to 37, characterized in that: At least two random access channel opportunities in at least one random access channel opportunity group among the multiple random access channel opportunity groups belong to two different time slots.

39. The first node according to any one of claims 27-38, characterized in that: include: a second receiver, configured to receive a first random access response within a first time window as a response to sending the first preamble group; The first random access channel opportunity group is used to determine the start of the first time window; and the first random access channel opportunity group is used to determine a scrambling sequence of the first random access response.

40. A second node for wireless communication, characterized in that: include: A first transmitter, configured to send one or more synchronization signal blocks, wherein 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; a first receiver, configured to receive a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel opportunity group comprising a plurality of random access channel opportunities, the plurality of random access channel opportunities in the first random access channel opportunity group being respectively used to transmit the plurality of preambles in the first preamble group; any two random access channel opportunities in the first random access channel opportunity group being orthogonal in the time domain; Among them, the multiple candidate synchronization signal block indexes are mapped to multiple random access channel time groups according to a first mapping order, and the first random access channel time group is one of the multiple random access channel time groups; the first random access channel time group corresponds to a first time group type, and the first time group type is one of multiple candidate time group types; the index of the first synchronization signal block, the first time group type and the first mapping order are used to determine the first random access channel time group.

41. The second node according to claim 40, characterized in that Any random access channel opportunity group among the multiple random access channel opportunity groups belongs to the first period.

42. The second node according to claim 40 or 41, characterized in that: The first opportunity group type includes a first repetition factor, the number of random access channel opportunities included in the first random access channel opportunity group is equal to the first repetition factor, and the first repetition factor is one of multiple repetition factors.

43. The second node according to claim 42, characterized in that Any random access channel opportunity group among the multiple random access channel opportunity groups corresponds to one of the multiple candidate opportunity group types; the multiple candidate opportunity group types respectively include the multiple repetition factors, and the number of random access channel opportunities included in the second random access channel opportunity group is equal to the repetition factor included in the candidate opportunity group type corresponding to the second random access channel opportunity group, wherein the second random access channel opportunity group is any random access channel opportunity group among the multiple random access channel opportunity groups.

44. The second node according to any one of claims 40-43, characterized in that: The first opportunity group type includes a first frequency hopping indication; the first frequency hopping indication is used to determine whether frequency domain resources occupied by at least two random access channel opportunities in the first random access channel opportunity group are different.

45. The second node according to any one of claims 40-44, characterized in that: The first opportunity group type includes a first frequency hopping spectrum; and frequency domain resources occupied by any random access channel opportunity in the first random access channel opportunity group correspond to the first frequency hopping spectrum.

46. ​​The second node according to any one of claims 40-45, characterized in that: The index of the first synchronization signal block, the first opportunity group type, and the first mapping order are used to determine the first random access channel opportunity group, including: According to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel opportunity groups among the multiple random access channel opportunity groups, the at least two random access channel opportunity groups respectively correspond to at least two different candidate opportunity group types, and the first opportunity group type is used to determine the first random access channel opportunity group from the at least two random access channel opportunity groups.

47. The second node according to any one of claims 40-45, characterized in that: The index of the first synchronization signal block, the first opportunity group type, and the first mapping order are used to determine the first random access channel opportunity group, including: The first timing group type is used to determine at least L random access channel timing groups from the multiple random access channel timing groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel timing group from the at least L random access channel timing groups, where L is a positive integer greater than 1.

48. The second node according to any one of claims 40-47, characterized in that: The first mapping order includes one or more of the following orders: in an increasing order of preamble index within a random access channel opportunity group among the plurality of random access channel opportunity groups; According to the increasing order of frequency domain resources of the plurality of random access channel opportunity groups; In the order of increasing time domain resources of the multiple random access channel opportunity groups.

49. The second node according to claim 48, characterized in that The first mapping order includes: first, according to the ascending order of the leading index within a random access channel opportunity group among the multiple random access channel opportunity groups; second, according to the ascending order of the frequency domain resources of the multiple random access channel opportunity groups; and third, according to the ascending order of the time domain resources of the multiple random access channel opportunity groups.

50. The second node according to any one of claims 40-49, characterized in that: The multiple random access channel opportunity groups include multiple random access channel opportunities, each random access channel opportunity among the multiple random access channel opportunity groups included in the multiple random access channel opportunity groups belongs to only one random access channel opportunity group among the multiple random access channel opportunity groups; or each random access channel opportunity is shared by at least two random access channel opportunity groups among the multiple random access channel opportunity groups.

51. The second node according to any one of claims 40-50, characterized in that: At least two random access channel opportunities in at least one random access channel opportunity group among the multiple random access channel opportunity groups belong to two different time slots.

52. The second node according to any one of claims 40-51, characterized in that: include: a second transmitter, configured to send a first random access response within a first time window as a response to receiving the first preamble group; The first random access channel opportunity group is used to determine the start of the first time window; and the first random access channel opportunity group is used to determine a scrambling sequence of the first random access response.

53. A first node for wireless communication, characterized in that: The device comprises a memory, a processor and a transceiver, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the first node executes the method according to any one of claims 1 to 13.

54. A second node for wireless communication, characterized in that: The device comprises a memory, a processor and a transceiver, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the second node executes the method according to any one of claims 14 to 26.

55. A device, characterized in that The device comprises a processor, configured to call a program from a memory so as to enable the device to execute the method according to any one of claims 1 to 26.

56. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 26.

57. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 26.

58. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method according to any one of claims 1 to 26.

59. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 26.

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