Method and apparatus in a node for wireless communication

Abstract

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

Description

TECHNICAL FIELD

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

[0002] To enhance the coverage performance of random access, certain communication systems (such as new radio (NR) systems) plan to introduce a scheme based on multiple physical random access channel (PRACH) transmission. However, in the scenario of multiple PRACH transmission, the mapping method of the conventional Synchronization Signal / Physical Broadcast Channel block (SSB or SS / PBCH block for short) and random access occasion (RO, which can also be referred to as PRACH occasion) for wireless communication can cause multiple random access occasions to overlap in the time domain, not only bringing higher requirements for system configuration, but also increasing system processing complexity, increasing transmission power overhead; it can also cause a large time interval between multiple random access occasions, thereby expanding the access delay of the system; it can also cause a decrease in the utilization efficiency of random access resources; and it can also cause an increase in additional signaling overhead. SUMMARY

[0003] In view of this, embodiments of the present application are dedicated to providing a method and apparatus for a node in wireless communication, and the various aspects involved in the present application are introduced as follows.

[0004] In a first aspect, a method in a first node for wireless communication is provided, comprising: receiving a first synchronization signal block, an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; transmitting a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being respectively used for transmitting the plurality of preambles in the first preamble group; any two random access channel occasions in the first random access channel occasion group being orthogonal in time domain; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups; the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of a plurality of candidate occasion group types; the index of the first synchronization signal block, the first occasion group type and the first mapping order being used for determining the first random access channel occasion group.

[0005] In a second aspect, a method in a second node for wireless communication is provided, comprising: transmitting one or more synchronization signal blocks, a first synchronization signal block being one of the one or more synchronization signal blocks, an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; receiving a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being respectively used for transmitting the plurality of preambles in the first preamble group; any two random access channel occasions in the first random access channel occasion group being orthogonal in time domain; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups; the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of a plurality of candidate occasion group types; the index of the first synchronization signal block, the first occasion group type and the first mapping order being used for determining the first random access channel occasion group.

[0006] In a third aspect, a first node for wireless communication is provided, comprising: a first receiver configured to receive a first synchronization signal block, an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; a first transmitter configured to transmit a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being respectively used to transmit the plurality of preambles in the first preamble group; any two random access channel occasions in the first random access channel occasion group being orthogonal in time domain; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups; the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of a plurality of candidate occasion group types; the index of the first synchronization signal block, the first occasion group type and the first mapping order being used to determine the first random access channel occasion group.

[0007] In a fourth aspect, a second node for wireless communication is provided, comprising: a first transmitter configured to transmit one or more synchronization signal blocks, a first synchronization signal block being one of the one or more synchronization signal blocks, an index of the first synchronization signal block being 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 occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being respectively used to transmit the plurality of preambles in the first preamble group; any two random access channel occasions in the first random access channel occasion group being orthogonal in time domain; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups; the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of a plurality of candidate occasion group types; the index of the first synchronization signal block, the first occasion group type and the first mapping order being used to determine the first random access channel occasion group.

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

[0009] In a sixth aspect, a second node for wireless communication is provided, which comprises a processor, a memory and a communication interface, the memory is configured to store one or more computer programs, and the processor is configured to invoke the computer programs in the memory to enable the second node to perform some or all of the steps in the method of the second aspect.

[0010] In a seventh aspect, a communication system is provided, which comprises the first node and / or the second node described above. In another possible design, the system can further comprise other devices interacting with the first node or the second node in the solutions provided by the embodiments.

[0011] In an eighth aspect, a computer readable storage medium is provided, which stores a computer program, and the computer program enables the first node or the second node to perform some or all of the steps in the methods of the above aspects.

[0012] In a ninth aspect, a computer program product is provided, which comprises a non-transitory computer readable storage medium storing a computer program, and the computer program is operable to enable the first node or the second node to perform some or all of the steps in the methods of the above aspects. In some implementations, the computer program product can be a software installation package.

[0013] In a tenth aspect, a chip is provided, which comprises a memory and a processor, and the processor can invoke and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0014] In the embodiments, the first node can determine the first random access channel occasion set corresponding to the first synchronization signal block according to the index of the first synchronization signal block, the first occasion set type and the first mapping order, so that any two random access channel occasions in the determined first random access channel occasion set are orthogonal in the time domain, i.e., any two random access channel occasions in the first random access channel occasion set do not overlap in the time domain.

[0015] In the embodiments, any two random access channel occasions in the first random access channel occasion set determined by the first node according to the index of the first synchronization signal block, the first occasion set type and the first mapping order do not overlap in the time domain. The embodiments change the mapping method of the synchronization signal block and the random access occasion to ensure that any two random access channel occasions in the first random access channel occasion set do not overlap in the time domain, so as to reduce the requirement on system configuration, reduce system processing complexity and save transmission power overhead.

[0016] The mapping method of the synchronization signal block and the random access occasion provided in the embodiments of the present application is beneficial to ensuring that the time intervals between the multiple random access channel occasions in the determined first random access channel occasion group are small, thereby being beneficial to reducing the access delay of the system.

[0017] In addition, the mapping method of the synchronization signal block and the random access occasion provided in the embodiments of the present application is beneficial to improving the utilization efficiency of the random access resource, or is beneficial to saving the signaling overhead. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A system architecture example diagram of a wireless communication system to which the embodiments of the present application can be applied is shown.

[0019] Figure 2 An example diagram of the mapping relationship between the synchronization signal block and the random access channel occasion is shown.

[0020] Figure 3 A flowchart of the method for wireless communication provided in the embodiments of the present application is shown.

[0021] Figure 4 An example diagram of the mapping relationship between the synchronization signal block and the random access channel occasion group provided in an embodiment of the present application is shown.

[0022] Figure 5 An example diagram of the mapping relationship between the synchronization signal block and the random access channel occasion group provided in another embodiment of the present application is shown.

[0023] Figure 6 An example diagram of the mapping relationship between the synchronization signal block and the random access channel occasion group provided in yet another embodiment of the present application is shown.

[0024] Figure 7 A flowchart of the method for wireless communication provided in another embodiment of the present application is shown.

[0025] Figure 8 A structural diagram of the first node provided in the embodiments of the present application is shown.

[0026] Figure 9 A structural diagram of the second node provided in the embodiments of the present application is shown.

[0027] Figure 10 A schematic structural diagram of the communication apparatus provided in the embodiments of the present application is shown.

[0028] Figure 11 A hardware module schematic diagram of the communication device provided in the embodiments of the present application is shown. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application.

[0030] Communication system architecture

[0031] Figure 1 is an example diagram of a system architecture of a wireless communication system 100 to which embodiments of the present application can be applied. The wireless communication system 100 can include a network device 110 and a user equipment (UE) 120. The network device 110 can be a device that communicates with the user equipment 120. The network device 110 can provide communication coverage for a specific geographic area and can communicate with the user equipment 120 located within the coverage area.

[0032] Figure 1 Exemplarily, one network device and two user equipments are shown, optionally, the wireless communication system 100 can include multiple network devices and each network device can include other number of user equipments within the coverage range of the network device, which is not limited in the embodiments of the present application.

[0033] Optionally, the wireless communication system 100 can further include a network controller, a mobile management entity and other network entities, which are not limited in the embodiments of the present application.

[0034] 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 (Beam Failure Recovery). Further, although the technical solutions of the embodiments of the present application are directed to random access procedure Type-1 (Type-1 random access procedure), the technical solutions of the embodiments of the present application can also be used for random access procedure Type-2 (Type-2 random access procedure). Further, although the technical solutions of the embodiments of the present application are directed to Uu interface, the technical solutions of the embodiments of the present application can also be used for PC5 interface. Further, 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. Further, 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. Further, 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 the V2X scenario, the communication scenario between user equipment and relay, and the communication scenario between relay and base station, and achieve similar technical effects as in the scenario of user equipment and base station. Further, the technical solutions of the embodiments of the present application can be applied to various communication scenarios, such as: Enhanced Mobile Broadband (eMBB) scenario, Ultra Reliable & Low Latency Communication (URLLC) scenario, Massive Machine Type Communication (mMTC) scenario, etc. In addition, the unified solution adopted by different scenarios helps to reduce hardware complexity and cost.

[0035] It should be understood that the embodiments and features in the embodiments of the first node of the present application can be applied to the second node without conflict, and vice versa. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict.

[0036] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, for example: a 5th generation (5G) system or new radio (NR), a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, and the like. The technical solutions provided in the present application can also be applied to future communication systems, such as a 6th generation mobile communication system, a satellite communication system, and the like.

[0037] The user equipment in the embodiments of the present application can also be referred to as a terminal device, an access terminal, a user unit, a user station, a mobile station, 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 apparatus. The user equipment in the embodiments of the present application can be a device that provides voice and / or data connectivity for a user, and can be used to connect people, things, and machines, such as handheld devices with wireless connection functions, vehicle-mounted devices, and the like. The user equipment in the embodiments of the present application can be a mobile phone, a tablet computer (Pad), a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, and the like. 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, and the like. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and the smart home device communicate with each other without relaying the communication signals through the base station.

[0038] The network device in the embodiments of the present application can be a device for communicating with a user equipment, which can also be referred to as an access network device or a radio access network device, such as a network device can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) that accesses a user equipment to a wireless network. The base station can broadly cover various names in the following or be replaced by the following names, such as: Node B (NodeB), evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, auxiliary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip for being disposed in the foregoing device or apparatus. The base station can also be a mobile switching center and a device that undertakes a base station function in device-to-device (D2D), vehicle-to-everything (V2X), machine-to-machine (M2M) communication, network side device in 6G network, device that undertakes a base station function in future communication system, etc. The base station can support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0039] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, a helicopter or a drone can be configured to act as a device that communicates with another base station.

[0040] In some deployments, the network device in the embodiments of the present application can refer to a CU or a DU, or the network device includes a CU and a DU. The gNB can also include an AAU.

[0041] The network device and the user equipment can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water surface; can also be deployed on aircraft, balloons and satellites in the air. The scenarios in which the network device and the user equipment in the embodiments of the present application are located are not limited.

[0042] It should be understood that all or part of the functions of the communication device in the present application can also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform (such as a cloud platform).

[0043] It should be understood that the explanation of the terminology in the embodiments of the present application can refer to the specification protocols TS36 series, TS37 series and TS38 series of 3GPP, but also can refer to the specification protocols of the Institute of Electrical and Electronics Engineers (IEEE).

[0044] Coverage enhancement for PRACH transmission

[0045] The coverage performance of a communication system (such as an NR system) is an important factor that needs to be considered by an operator when deploying a communication network commercially, because the coverage performance of the communication system will directly affect the service quality of the communication system and the cost of the operator, such as the capital expenditure (CAPEX) of the operator and the operating cost (OPEX) of the operator.

[0046] The coverage performance of the communication system changes with the frequency band in which the communication system works. For example, compared with the LTE system, the frequency band in which the NR system works is higher (such as the millimeter wave frequency band), resulting in greater path loss of the NR system, and thus the coverage performance of the NR system is relatively worse. Therefore, as the frequency band supported by the communication system can be higher and higher, how to perform coverage enhancement on the communication system becomes a problem to be solved.

[0047] In most scenarios of actual deployment, the uplink coverage performance is the bottleneck of coverage enhancement for a communication system, because the capability of a user equipment is weaker than that of a network equipment. With the development of communication technology, the uplink service in some emerging vertical use cases also gradually increases, such as video uploading service. In the scenario with more uplink service, how to perform coverage enhancement for the uplink is a problem to be further solved.

[0048] In the related art, there are some technical solutions for coverage enhancement of the uplink. For example, the 17th release (Rel-17) of NR has designed a coverage enhancement solution for the physical uplink shared channel (PUSCH), the physical uplink control channel (PUCCH), and the message 3 (Msg3) in the random access procedure.

[0049] However, Rel-17 does not design a coverage enhancement solution for PRACH, but the PRACH transmission performance is very important for many procedures such as initial access and beam failure recovery, so it is also very important to perform coverage enhancement for PRACH. Based on this, the Rel-18 officially establishes a work item (WI) of “further NR coverage enhancements”, and enhancing the coverage performance of PRACH transmission is one of the important issues of the work item.

[0050] As a possible implementation manner, multiple PRACH transmissions can be used to perform coverage enhancement for PRACH transmission. That is, the coverage enhancement for PRACH transmission can be realized by repeated transmission of PRACH (for example, sending a preamble in PRACH multiple times).

[0051] In the embodiments of the present application, the multiple PRACH transmission can refer to multiple PRACH transmission using the same beam, or can refer to multiple PRACH transmission using different beams. Taking the multiple PRACH transmission 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: PRACH occasions (or RACH occasions) located at least at different time instances can be used for multiple PRACH transmission using the same beam. In addition, the RAN1#110bis-e meeting further defines the repetition factor (the number / quantity of multiple PRACH transmissions) of the multiple PRACH transmission using the same beam, which can include at least 2 and 4, and may further include 8 in the future.

[0052] Association mapping of synchronization signal block and PRACH occasions

[0053] A synchronization signal block is a signal structure defined in a communication standard, which can contain a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). In some embodiments, the synchronization signal block can be represented as SSB (synchronization signal block), and in some embodiments, the synchronization signal block can also be represented as SS / PBCH block (synchronization signal / physical broadcast channel block), that is, the synchronization signal block can also be called a synchronization signal broadcast channel block, and the embodiments of the present application are not limited to this. It should be noted that hereinafter, the synchronization signal block is taken as an example of SSB for introduction, and of course, the SSB in the following can be replaced by SS / PBCH block.

[0054] The SSB is a set of resources transmitted on a basic orthogonal frequency division multiplexing grid, which can include one or more of the following resources: time domain resources, frequency domain resources, code domain resources, etc.

[0055] In the process of initial access or beam failure recovery of the user equipment, when the user equipment detects the SSB sent by the network equipment, the SSB index of the SSB can be obtained, so that the time domain position of the SSB can be known, so as to realize the downlink synchronization with the network equipment. In order to realize the uplink synchronization, the user equipment needs to send the preamble to the network equipment. How the user equipment selects the preamble to be sent, and in which PRACH occasion the selected preamble should be sent are determined by the user equipment according to the received (or detected) SSB.

[0056] As a feasible technical solution, the SSB can be associated with at least one preamble in at least one PRACH occasion, so that when the user equipment performs initial access or beam failure recovery, the associated PRACH occasion and preamble can be determined according to the received SSB, so that the PRACH transmission can be continued.

[0057] In the related art, the association mapping relationship between the SSB and the PRACH occasion and the preamble follows the following order: first, arrange in the order of increasing preamble index in each PRACH occasion; second, arrange the frequency division multiplexed PRACH occasions in the order of increasing frequency domain resource index; third, arrange the time division multiplexed PRACH occasions in each PRACH slot in the order of increasing time domain resource index; and finally, arrange in the order of increasing PRACH slot index.

[0058] The following will be combined Figure 2 An example of the association mapping relationship between the SSB and the PRACH occasion is given. In Figure 2 the example, it is assumed that there are 8 SSB beams, and the SSB indexes corresponding to the 8 SSB beams are SSB0-SSB7; it is assumed that the value of the SSB-perRACH-Occasion parameter sent by the network equipment to the user equipment is 1 / 2; and it is assumed that the number of frequency division multiplexed PRACH occasions sent by the network equipment to the user equipment is 4, then the PRACH occasion corresponding to the SSB is as shown in Figure 2 , wherein each box in the figure represents a PRACH occasion.

[0059] As described above, the coverage enhancement of PRACH can be realized by multi-PRACH transmission, and in the multi-PRACH transmission scenario, if the above association mapping relationship is used to determine the multiple PRACH occasions associated with the SSB, it may cause the multiple PRACH occasions associated with the same SSB to overlap in the time domain, thereby increasing the transmission power overhead of the device.

[0060] In addition, in the scenario of multi-PRACH transmission with the same beam, if the above-mentioned association mapping relationship is used to determine the multiple PRACH occasions associated with an SSB, it also conflicts with the time-domain orthogonal PRACH occasion scheme for multi-PRACH transmission reached at the RAN1#110-bis-e meeting.

[0061] In summary, in the multi-PRACH transmission scenario, how to determine the multiple PRACH occasions associated with an SSB according to the SSB is a problem to be solved.

[0062] To solve the above-mentioned problem, the embodiments of the present application provide a method and device in a node for wireless communication, which can effectively associate and map an SSB to multiple time-domain orthogonal PRACH occasions, thereby facilitating the saving of transmission power overhead.

[0063] The embodiments of the present application can be applied in the scenario of multi-PRACH transmission, that is, multiple PRACH repeated transmissions can be used to realize the coverage enhancement of PRACH.

[0064] In some embodiments, the multi-PRACH transmission mentioned in the embodiments of the present application can refer to multi-PRACH transmission with the same beam, so as to obtain signal-to-noise ratio (SNR) gain by repeating the transmission of multiple PRACHs on the same beam. In some embodiments, the multi-PRACH transmission mentioned in the embodiments of the present application can refer to multi-PRACH transmission with different beams, so as to obtain diversity gain by repeating the transmission of multiple PRACHs on different beams.

[0065] 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 meaning expressed thereby can be consistent, which is not distinguished by the embodiments of the present application.

[0066] The embodiments of the present application can be applied in 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 in the four-step random access procedure (i.e., random access procedure type 1, type-1 random access procedure), or can also be applied in the two-step random access procedure (i.e., random access procedure type 2), which is not limited by the embodiments of the present application.

[0067] The method embodiments of the present application will be described in detail below with reference to the accompanying drawings. Figure 3 The flowchart of the method for wireless communication provided by an embodiment of the present application is shown. Figure 3The illustrated method is described from the perspective of the first node and the second node interacting.

[0068] As an example, the first node can be a network-controlled repeater (NCR).

[0069] As an example, the first node can be a user equipment, e.g., Figure 1 The illustrated user equipment 120.

[0070] As an example, the first node can be a relay, such as a relay terminal.

[0071] As an example, the second node can be a network equipment, e.g., Figure 2 The illustrated network equipment 110.

[0072] Figure 3 The illustrated method can include steps S310 and S320, which are described below.

[0073] At step S310, the first node receives a first synchronization signal block.

[0074] The index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes.

[0075] As an example, the first synchronization signal block can be one of one or more synchronization signal blocks transmitted by the second node.

[0076] As an example, a synchronization signal block (such as the first synchronization signal block, one or more synchronization signal blocks transmitted by the second node, etc.) can be denoted as SSB; or, a synchronization signal block can be denoted as SS / PBCH block, which is not limited in the embodiments of the present application.

[0077] As an example, the index of the first synchronization signal block is mapped to a first random access channel occasion group. The first random access channel occasion group includes a plurality of random access channel occasions.

[0078] As an example, the plurality of random access channel occasions included in the first random access channel occasion group can be denoted as RO (RACH occasion), or can be denoted as PRO (PRACH occasion), which is not limited in the embodiments of the present application.

[0079] At step S320, the first node transmits a first preamble group. The first preamble group includes a plurality of preambles. In some embodiments, a preamble can also be referred to as a preamble code, which is not limited in the embodiments of the present application.

[0080] The multiple random access channel occasions in the first group of random access channel occasions are respectively used for transmitting the multiple preambles in the first group of preambles. That is, the multiple preambles in the first group of preambles can be respectively transmitted on the multiple random access channel occasions in the first group of random access channel occasions, for example, each preamble is transmitted on one random access channel occasion.

[0081] Any two random access channel occasions in the first group of random access channel occasions are orthogonal in time domain. In this way, any two random access channel occasions in the first group of random access channel occasions will not overlap in time domain, that is, the multiple random access channel occasions of the first synchronization signal block association mapping are all non-overlapping in time domain.

[0082] As an embodiment, any random access channel occasion in the first group of random access channel occasions is valid. For example, for paired spectrum or supplementary uplink frequency band, all random access channel occasions can be valid. Or, for unpaired spectrum, the random access channel occasion can also be valid under certain conditions, for example, which can be associated with the parameter tdd-UL-DL-ConfigurationCommon.

[0083] As an embodiment, the multiple candidate synchronization signal block indexes above can be mapped to the multiple groups of random access channel occasions in a first mapping order, wherein the first group of random access channel occasions is one of the multiple groups of random access channel occasions. How the multiple candidate synchronization signal block indexes are mapped to the multiple groups of random access channel occasions in the first mapping order will be described in detail later, which is not described here.

[0084] As an embodiment, any group of random access channel occasions in the multiple groups of random access channel occasions includes at least one random access channel occasion. Taking the multiple groups of random access channel occasions including the first group of random access channel occasions as an example, the first group of random access channel occasions can include at least one random access channel occasion.

[0085] As an embodiment, any group of random access channel occasions in the multiple groups of random access channel occasions includes multiple (two or more) random access channel occasions, for example, the first group of random access channel occasions can include multiple random access channel occasions.

[0086] As an embodiment, any two random access channel occasions included in any group of random access channel occasions in the multiple groups of random access channel occasions are orthogonal in time domain.

[0087] As an embodiment, any two random access channel occasions are orthogonal in time domain can be understood as that any two random access channel occasions are distributed in different time instances. In some embodiments, time instance can be replaced by other terms such as time interval, and the embodiments of the present application are not limited thereto.

[0088] As an embodiment, any random access channel occasion group in the plurality of random access channel occasion groups is valid. For example, for paired spectrum or supplementary uplink frequency band, all random access channel occasion groups can be valid. Or, for unpaired spectrum, random access channel occasion groups can also be valid under certain conditions, which can be associated with the parameter tdd-UL-DL-ConfigurationCommon, etc.

[0089] As an embodiment, one or more random access channel occasions included in any random access channel occasion group in the plurality of random access channel occasion groups are valid.

[0090] As an embodiment, at least two random access channel occasions in at least one random access channel occasion group in the plurality of random access channel occasion groups belong to two different time slots. For example, a first period includes 3 random access channel slots (PRACH slots), and one or more random access channel occasion groups in the plurality of random access channel occasion groups can occupy 2 or 3 PRACH slots in the 3 PRACH slots.

[0091] As an embodiment, all random access channel occasions included in any random access channel occasion group in the plurality of random access channel occasion groups are located in the same time slot, i.e., all random access channel occasions included in any random access channel occasion group in the plurality of random access channel occasion groups are located in the same PRACH slot.

[0092] As an embodiment, any random access channel occasion group in the plurality of random access channel occasion groups can include a plurality of preambles. In this way, after the first node determines the random access channel occasion group (which can be any random access channel occasion group in the plurality of random access channel occasion groups) corresponding to the first synchronization signal block according to the index of the received (detected) first synchronization signal block, the first node can send a preamble on the random access channel occasion group.

[0093] As an embodiment, for any random access channel occasion group of the multiple random access channel occasion groups, the preamble index included in any random access channel occasion of the random access channel occasion group can be the same. Taking a first random access channel occasion group of the multiple random access channel occasion groups as an example, the preamble index included in the multiple random access channel occasions of the first random access channel occasion group can be the same, for example, the preamble index included in the multiple random access channel occasions of the first random access channel occasion group can range from 0 to 63.

[0094] As an embodiment, for any random access channel occasion group of the multiple random access channel occasion groups, the preamble index included in any random access channel occasion of the random access channel occasion group can be different or partially different. Still taking the first random access channel occasion group of the multiple random access channel occasion groups as an example, the preamble index included in the multiple random access channel occasions of the first random access channel occasion group can be different, for example, the first random access channel occasion group includes 4 random access channel occasions, and the preamble index included in the 4 random access channel occasions can range from 0 to 63, 64 to 127, 128 to 191, and 192 to 255, respectively.

[0095] As an embodiment, the first random access channel occasion group corresponds to a first occasion group type, that is, the first random access channel occasion group corresponds to the first occasion group type. The first occasion group type is one of multiple candidate occasion group types, and the information included in the first occasion group type and / or the candidate occasion group type can be various, for example, a repetition factor, a frequency hopping indication, a frequency hopping pattern, and the like, which will be described in detail below in combination with specific examples, and thus will not be described here in detail.

[0096] In the embodiment of the present application, the index of the first synchronization signal block, the first occasion group type, and the first mapping order can be used to determine the first random access channel occasion group. In this way, after the first node receives the first synchronization signal block, the first node can determine the first random access channel occasion group corresponding to the first synchronization signal block according to the index of the first synchronization signal block, the first occasion group type, and the first mapping order, and the multiple random access channel occasions included in the first random access channel occasion group determined by the first node according to the index of the first synchronization signal block, the first occasion group type, and the first mapping order are orthogonal in the time domain, respectively. Further, the first node transmits the multiple preambles in the first preamble group on the multiple random access channel occasions of the first random access channel occasion group, respectively, which can reduce random access delay and improve random access resource utilization efficiency.

[0097] As an embodiment, the index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group from the multiple random access channel occasion groups.

[0098] As an embodiment, the index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group from the multiple random access channel occasion groups included in the first period.

[0099] As an embodiment, the index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine any random access channel occasion in the first random access channel occasion group from the multiple random access channel occasions included in the first period.

[0100] The embodiments of the present application do not make specific limitation on the implementation manner of determining the first random access channel occasion group by using the index of the first synchronization signal block, the first occasion group type and the first mapping order, as long as the first random access channel occasion group corresponding to the first synchronization signal block can be determined by combining the above three kinds of information. Or, the embodiments of the present application can only need to filter out the first random access channel occasion group from the multiple random access channel occasion groups by using the above three kinds of information. The following exemplary gives several implementation manners of determining the first random access channel occasion group by using the index of the first synchronization signal block, the first occasion group type and the first mapping order.

[0101] As an embodiment, the index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, comprising: according to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the multiple random access channel occasion groups, the at least two random access channel occasion groups respectively correspond to at least two different candidate occasion group types, and the first occasion group type is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

[0102] As an embodiment, the index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, comprising: the first occasion group type is used to determine at least L random access channel occasion groups from the multiple random access channel occasion groups, the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel occasion group from the at least L random access channel occasion groups, and L is a positive integer greater than 1.

[0103] As an embodiment, L is one of {4, 8, 64}.

[0104] As an embodiment, any random access channel occasion group in the multiple random access channel occasion groups belongs to the first period.

[0105] As an embodiment, the first period can be understood as a mapping cycle of the synchronization signal block and the random access channel occasion.

[0106] As an embodiment, the first period can include one or more PRACH slots. As an example where the first period includes multiple PRACH slots, the embodiments of the present application do not limit the number of the multiple PRACH slots included in the first period, for example, can include 3 PRACH slots, 4 PRACH slots, or a larger number of PRACH slots.

[0107] As an embodiment, any random access channel occasion in any random access channel occasion group in the multiple random access channel occasion groups belongs to one of the multiple PRACH slots included in the first period.

[0108] As an embodiment, the first period includes the multiple random access channel occasion groups mentioned above. That is, the mapping of the multiple candidate synchronization signal block indexes to the multiple random access channel occasion groups according to the first mapping order is performed within the first period.

[0109] As an embodiment, the first period includes the multiple random access channel occasions.

[0110] As an embodiment, any random access channel occasion in the multiple random access channel occasion groups is one of the multiple random access channel occasions included in the first period. Or, one or more of the multiple random access channel occasions included in the first period can constitute any random access channel occasion group in the multiple random access channel occasion groups.

[0111] As an embodiment, the mapping of the multiple candidate synchronization signal block indexes to the multiple random access channel occasion groups according to the first mapping order can refer to the mapping of the multiple candidate synchronization signal block indexes to the multiple random access channel occasion groups in the first period.

[0112] As an embodiment, the mapping of the multiple candidate synchronization signal block indexes to the multiple random access channel occasion groups according to the first mapping order can refer to the mapping of the multiple candidate synchronization signal block indexes to the multiple random access channel occasions in the first period.

[0113] As an embodiment, any candidate synchronization signal block index in the multiple candidate synchronization signal block indexes can be mapped to at least one random access channel occasion group in the first period.

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

[0115] As an embodiment, the mapping of the plurality of candidate synchronization signal block indexes to the plurality of random access channel occasion groups is performed within a first period.

[0116] As an embodiment, the first period can refer to a PRACH configuration period.

[0117] As an embodiment, the first period can refer to an association period of mapping the plurality of candidate synchronization signal block indexes to the plurality of random access channel occasion groups.

[0118] As an embodiment, the first period can refer to an association pattern period containing one or more association periods.

[0119] As an embodiment, the first period of mapping the plurality of candidate synchronization signal block indexes to the plurality of random access channel occasion groups is the minimum value in a set determined by a PRACH configuration period.

[0120] As an embodiment, the set determined by the PRACH configuration period can refer to Table 1, i.e., the value of the first period can be determined according to Table 1.

[0121] Table 1

[0122] PRACH configuration period (msec) First period (number of PRACH configuration periods) 10 {1,2,4,8,16} 20 {1,2,4,8} 40 {1,2,4} 80 {1,2} 160 {1}

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

[0124] As described above, the index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, and the first occasion group type and the first mapping order are introduced respectively as follows.

[0125] The first occasion group type can 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 occasion group type can include one of the above information, such as only including the first repetition factor, or only including the first frequency hopping indication, or only including the first frequency hopping pattern.

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

[0128] As an embodiment, the first occasion group type can comprise one or more of the above information, and can further comprise other information, which is not limited in the embodiments of the present application.

[0129] As an embodiment, the first occasion group type can comprise a first repetition factor, and the number of random access channel occasions comprised in the first random access channel occasion group is equal to the first repetition factor. For example, the first repetition factor is 4, and the number of random access channel occasions comprised in the first random access channel occasion group is 4, that is, the first random access channel occasion group comprises 4 random access channel occasions.

[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, etc.

[0131] As an embodiment, the first repetition factor can comprise values predefined by a protocol or configured by a network.

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

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

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

[0135] As an embodiment, the plurality of repetition factors are different.

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

[0137] As an embodiment, the plurality of repetition factors can comprise at least 2 and 4. For example, the plurality of repetition factors can only comprise 2 and 4; or the plurality of repetition factors can comprise 2, 4 and other positive integers.

[0138] As an embodiment, the plurality of repetition factors can comprise 2, 4 and 8.

[0139] As an embodiment, the plurality of repetition factors can comprise 1, 2 and 4.

[0140] As an embodiment, the plurality of repetition factors can comprise 1, 2, 4 and 8.

[0141] As an embodiment, the plurality of repetition factors can be 2 and 4 respectively.

[0142] As one embodiment, the plurality of repetition factors can be 2, 4, and 8, respectively.

[0143] As one embodiment, the plurality of repetition factors can be 1, 2, and 4, respectively.

[0144] As one embodiment, the plurality of repetition factors can be 1, 2, 4, and 8, respectively.

[0145] As one embodiment, the number of all random access channel occasions included in any one of the plurality of random access channel occasion groups is equal to one of the plurality of repetition factors. For example, when the plurality of repetition factors are 2 and 4, respectively, any one of the plurality of random access channel occasion groups either includes 2 random access channel occasions or includes 4 random access channel occasions.

[0146] As one embodiment, the plurality of candidate occasion group types can include a first candidate occasion group type and a second candidate occasion group type, and the first candidate occasion group type is different from the second candidate occasion group type.

[0147] As one embodiment, the first candidate occasion group type being different from the second candidate occasion group type can include that the repetition factor included in the first candidate occasion group type is different from the repetition factor included in the second candidate occasion group type.

[0148] As one embodiment, when the first occasion group type belongs to different candidate occasion group types, the first repetition factor included in the first occasion group type is different. For example, when the first occasion group type is the first candidate occasion group type, the first repetition factor is one of the plurality of repetition factors; when the first occasion group type is the second candidate occasion group type, the first repetition factor is other than the repetition factor included in the first candidate occasion group type. As one specific example, when the first occasion group type is the first candidate occasion group type, the first repetition factor can be 2; when the first occasion group type is the second candidate occasion group type, the first repetition factor can be 4.

[0149] As one embodiment, any one of the plurality of random access channel occasion groups corresponds to one of the plurality of candidate occasion group types. For example, the plurality of random access channel occasion groups includes A, B, C, and D, a total of 4 random access channel occasion groups, and the candidate occasion group types include a first candidate occasion group type and a second candidate occasion group type, wherein the A random access channel occasion group and the B random access channel occasion group correspond to the first candidate occasion group type, and the C random access channel occasion group and the D random access channel occasion group correspond to the second candidate occasion group type.

[0150] As an embodiment, the plurality of candidate occasion group types respectively comprise the plurality of repetition factors. Taking the plurality of repetition factors comprising 2 and 4 as an example, a first candidate occasion group type in the plurality of candidate occasion group types can comprise a repetition factor 2, and a second candidate occasion group type can comprise a repetition factor 4.

[0151] As an embodiment, the number of all random access channel occasions comprised by the second random access channel occasion group is equal to a repetition factor comprised by a candidate occasion group type corresponding to the second random access channel occasion group, wherein the second random access channel occasion group is any one of the plurality of random access channel occasion groups. Illustratively, if the candidate occasion group type corresponding to the second random access channel occasion group is the first candidate occasion group type, and the first candidate occasion group type comprises a repetition factor 2, then the number of random access channel occasions comprised by the second random access channel occasion group is equal to 2; if the candidate occasion group type corresponding to the second random access channel occasion group is the second candidate occasion group type, and the second candidate occasion group type comprises a repetition factor 4, then the number of random access channel occasions comprised by the second random access channel occasion group is equal to 4.

[0152] As an embodiment, the plurality of candidate occasion group types respectively comprise the plurality of repetition factors, and the number of all random access channel occasions comprised by any one of the plurality of random access channel occasion groups is equal to one repetition factor in the plurality of repetition factors. For example, the number of all random access channel occasions comprised by any one of the plurality of random access channel occasion groups can be equal to one of 1, 2, 4, and 8.

[0153] As an embodiment, the first occasion group type can comprise a first frequency hopping indication. The first frequency hopping indication can be used to determine whether the frequency domain resources occupied by at least two random access channel occasions in the first random access channel occasion group are different. Or, the first frequency hopping indication can be used to determine whether the frequency domain resources occupied by at least two random access channel occasions in the first random access channel occasion group are the same.

[0154] As an embodiment, the plurality of candidate occasion group types can comprise a first candidate occasion group type and a second candidate occasion group type, and the first candidate occasion group type is different from the second candidate occasion group type.

[0155] As an embodiment, the first candidate occasion group type being different from the second candidate occasion group type can comprise that a frequency hopping indication comprised by the first candidate occasion group type is different from a frequency hopping indication comprised by the second candidate occasion group type.

[0156] As an embodiment, the first occasion group type includes a first frequency hopping indication when the first occasion group type belongs to different candidate occasion group types. For example, the first frequency hopping indication can be used to indicate that frequency domain resources occupied by all random access channel occasions in the first random access channel occasion group are the same when the first occasion group type is a first candidate occasion group type; the first frequency hopping indication can be used to indicate that frequency domain resources occupied by at least two random access channel occasions in the first random access channel occasion group are different when the first occasion group type is a second candidate occasion group type.

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

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

[0159] As an embodiment, the plurality of candidate occasion group types can include a first candidate occasion group type and a second candidate occasion group type, and the first candidate occasion group type is different from the second candidate occasion group type.

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

[0161] As an embodiment, the first frequency hopping pattern included in the first occasion group type is different when the first occasion group type belongs to different candidate occasion group types. For example, the first frequency hopping pattern included in the first occasion group type is an A frequency hopping pattern when the first occasion group type belongs to a first candidate occasion group type; the first frequency hopping pattern included in the first occasion group type is a B frequency hopping pattern when the first occasion group type belongs to a second candidate occasion group type, wherein the A frequency hopping pattern is at least partially different from the B frequency hopping pattern.

[0162] As an embodiment, the plurality of candidate occasion group types can respectively include a plurality of frequency hopping patterns. Frequency domain resources occupied by any random access channel occasion group in the plurality of random access channel occasion groups correspond to one of the plurality of frequency hopping patterns.

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

[0164] As an embodiment, the first occasion group type is one of the plurality of candidate occasion group types, and thus the plurality of candidate occasion group types can comprise one or more of the following information: a repetition factor, a frequency hopping indication, and a frequency hopping pattern. For the specific content of the information comprised by the plurality of candidate occasion group types, it is similar to the information comprised by the first occasion group type, and specific introduction can be referred to the introduction of the information comprised by the first occasion group type in the foregoing, which will not be described herein again for the sake of brevity.

[0165] In the embodiment of the present application, the plurality of random access channel occasions are divided into the plurality of random access channel occasion groups by using the plurality of candidate occasion group types (such as the plurality of repetition factors), so that the number of random access channel occasions occupied by the multiple PRACH transmission is variable.

[0166] The first mapping order will be 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 occasion group, a frequency domain resource of the plurality of random access channel occasion groups, and a time domain resource of the plurality of random access channel occasion groups.

[0168] As an embodiment, the first mapping order can comprise: a variation order of the preamble index within one of the plurality of random access channel occasion groups, such as an increasing order of the preamble index or a decreasing order of the preamble index, and the like. In other words, the plurality of candidate synchronization signal block indexes can be arranged according to the variation order (such as the increasing order) of the preamble index within one of the plurality of random access channel occasion groups.

[0169] As an embodiment, the first mapping order can comprise: a variation order of the frequency domain resource of the plurality of random access channel occasion groups, such as an increasing order of the frequency domain resource or a decreasing order of the frequency domain resource, and the like. In other words, the plurality of candidate synchronization signal block indexes can be arranged according to the variation order (such as the increasing order) of the frequency domain resource of the plurality of random access channel occasion groups for frequency division multiplexing of the plurality of random access channel occasion groups.

[0170] As an embodiment, the first mapping order can comprise: a variation order of the time domain resource of the plurality of random access channel occasion groups, such as an increasing order of the time domain resource or a decreasing order of the time domain resource, and the like. In other words, the plurality of candidate synchronization signal block indexes can be arranged according to the variation order (such as the increasing order) of the time domain resource of the plurality of random access channel occasion groups for time division multiplexing of the plurality of random access channel occasion groups.

[0171] As an embodiment, the first mapping order can comprise one or more of the following orders: an order of increasing preamble index within one of the plurality of random access channel occasion groups; an order of increasing frequency domain resources of the plurality of random access channel occasion groups; and an order of increasing time domain resources of the plurality of random access channel occasion groups.

[0172] As an embodiment, the first mapping order can comprise: first an order of increasing preamble index within one of the plurality of random access channel occasion groups; second an order of increasing frequency domain resources of the plurality of random access channel occasion groups; and third an order of increasing time domain resources of the plurality of random access channel occasion groups.

[0173] However, embodiments of the present application are not limited thereto, and the first mapping order can comprise the above-mentioned orders in random permutation and combination, and the order among them can be exchanged. For example, the first mapping order can comprise: first an order of increasing preamble index within one of the plurality of random access channel occasion groups; second an order of increasing time domain resources of the plurality of random access channel occasion groups; and third an order of increasing frequency domain resources of the plurality of random access channel occasion groups, and so on.

[0174] As an embodiment, the plurality of random access channel occasion groups can comprise a plurality of random access channel occasions, and each of the plurality of random access channel occasions comprised by the plurality of random access channel occasion groups can belong to only one of the plurality of random access channel occasion groups. In other words, the plurality of random access channel occasion groups will not be repeated, i.e., the resources (such as random access channel occasions) occupied by the plurality of random access channel occasion groups will not overlap.

[0175] The following will be described in combination with Figure 4 Examples in which each of the plurality of random access channel occasions belongs to only one random access channel occasion group are given.

[0176] As Figure 4 shown, it is assumed that the plurality of repetition factors comprised by the plurality of candidate occasion group types are 1, 2 and 4 respectively, wherein 4 is the maximum repetition factor Qmax, or in other words, the maximum repetition factor Qmax of the multiple PRACH transmission is 4. As an implementation manner, in the first period, all random access channel occasions in the first period can be divided into a plurality of random access channel occasion groups in turn according to the plurality of repetition factors comprised by the plurality of candidate occasion group types.

[0177] In Figure 4 the example, all random access channel occasions in the first period are divided into a plurality of random access channel occasion groups in turn according to an order of decreasing the plurality of repetition factors comprised by the plurality of candidate occasion group types.

[0178] In Figure 4 the example, each dashed box represents a random access channel occasion group, which is divided in a sequential order of decreasing repetition factors (1, 2, and 4).

[0179] In Figure 4 the example, the plurality of random access channel occasion groups includes a plurality of random access channel occasions. For any random access channel occasion included in the plurality of random access channel occasion groups, it only belongs to one random access channel occasion group. For example, random access channel occasion 1 (RO1 in the figure) only belongs to one random access channel (ROG1 in the figure), random access channel occasion 8 (RO8 in the figure) only belongs to one random access channel (ROG2 in the figure), and so on.

[0180] In Figure 4 the example, the plurality of random access channel occasion groups includes a plurality of random access channel occasions. For each random access channel occasion included in the plurality of random access channel occasion groups, different candidate synchronization signal block indexes are mapped to different preambles included in the each random access channel occasion. For example, taking random access channel occasion 1 as an example, candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are both mapped to random access channel occasion 1, but candidate synchronization signal block index 0 and candidate synchronization signal block index 1 are mapped to different preambles in random access channel occasion 1, such as candidate synchronization signal block index 0 is mapped to preambles 0-21 in random access channel occasion 1, and candidate synchronization signal block index 1 is mapped to preambles 22-43 in random access channel occasion 1.

[0181] As an embodiment, the plurality of random access channel occasion groups can include a plurality of random access channel occasions, and each random access channel occasion in the plurality of random access channel occasions included in the plurality of random access channel occasion groups can be shared by at least two random access channel occasion groups in the plurality of random access channel occasion groups. In other words, the resources (such as random access channel occasions) occupied by the plurality of random access channel occasion groups can overlap.

[0182] The following gives an example of each random access channel occasion in the plurality of random access channel occasions being shared by at least two random access channel occasion groups in the plurality of random access channel occasion groups. Figure 5 As

[0183] Figure 5 ​As shown, it is assumed that the multiple repetition factors included in the multiple candidate occasion 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, in the first period, all the random access channel occasions in the first period can be divided into multiple random access channel occasion groups according to the multiple repetition factors included in the multiple candidate occasion group types respectively.

[0184] In Figure 5 the example, all the random access channel occasions in the first period are divided into multiple random access channel occasion groups according to the multiple repetition factors included in the multiple candidate occasion group types respectively.

[0185] In Figure 5 the example, each dashed box represents a random access channel occasion group, which is divided according to multiple repetition factors (1, 2 and 4) respectively. Among them, the dashed oval box and the dashed square box represent the random access channel occasion groups divided according to different repetition factors respectively. For example, the dashed oval box represents the random access channel occasion group divided according to the repetition factor 4, and the dashed square box represents the random access channel occasion group divided according to the repetition factor 2.

[0186] In Figure 5 the example, the multiple random access channel occasion groups include multiple random access channel occasions. For any random access channel occasion included in the multiple random access channel occasion groups, it is shared by at least two random access channel occasion groups in the multiple random access channel occasion groups. For example, random access channel occasion 1 (RO1 in the figure) is shared by two random access channel occasion groups (ROG1 and ROG7 in the figure), random access channel occasion 8 (RO8 in the figure) is shared by two random access channel occasion groups (ROG2 and ROG8 in the figure), and so on.

[0187] In Figure 5In the example, the plurality of random access channel timing groups include a plurality of random access channel timings. For each random access channel timing included in the plurality of random access channel timing groups, at least two random access channel timing groups sharing the random access channel timing are mapped to different preambles among the plurality of preambles included in the random access channel timing. For example, taking random access channel timing 1 as an example, random access channel timing group 1 and random access channel timing group 7 share random access channel timing 1 and are both mapped to random access channel timing 1, but random access channel timing group 1 and random access channel timing group 7 are mapped to different preambles in random access channel timing 1. For example, random access channel timing group 1 is mapped to preambles 0-21 in random access channel timing 1, and random access channel timing group 7 is mapped to preambles 22-43 in random access channel timing 1.

[0188] Figure 6 Another example of each of a plurality of random access channel opportunities being shared by at least two random access channel opportunity groups in a plurality of random access channel opportunity groups. Figure 6 The solution can be understood as Figure 4 and Figure 5 The combination (or hybridization) of the implementation methods shown.

[0189] like Figure 6 As shown, assuming the multiple candidate timing group types include repetition factors of 1, 2, and 4, where 4 is the maximum repetition factor Qmax, or in other words, the maximum repetition factor Qmax for multi-PRACH transmission is 4. As one implementation, within the first period, all random access channel timings within the first period can be sequentially divided into multiple random access channel timing groups according to the multiple repetition factors included in the multiple candidate timing group types (i.e., first according to...). Figure 4 The implementation shown divides the random access channel timing groups into multiple random access channel timing groups. Then, for the random access channel timing groups whose preamble is not fully used, a secondary division is performed. These two divisions correspond to different candidate timing group types (e.g., repetition factor). For example, they can be divided according to... Figure 5 The implementation shown is further divided.

[0190] exist Figure 6 In the example, each dashed box represents a random access channel timing group. The dashed ellipse represents multiple random access channel timing groups obtained by first dividing them according to multiple repetition factors included in multiple candidate timing group types. The dashed square represents random access channel timing groups obtained by second-dividing the random access channel timing groups that have not been fully used in the preamble.

[0191] exist Figure 6In an example of the first aspect, the multiple random access channel occasion groups include multiple random access channel occasions. For any random access channel occasion included by the multiple random access channel occasion groups, it can belong to only one random access channel occasion group, or be shared by at least two random access channel occasion groups among the multiple random access channel occasion groups. For example, random access channel occasion 1 (RO1 in the figure) belongs to only random access channel occasion group 1 (ROG1 in the figure), random access channel occasion 13 (RO13 in the figure) is shared by two random access channel occasion groups (ROG4 and ROG12 in the figure), and so on.

[0192] In an example of the first aspect, the multiple random access channel occasion groups include multiple random access channel occasions. For any random access channel occasion included by the multiple random access channel occasion groups, it can belong to only one random access channel occasion group, or be shared by at least two random access channel occasion groups among the multiple random access channel occasion groups. For example, random access channel occasion 1 (RO1 in the figure) belongs to only random access channel occasion group 1 (ROG1 in the figure), random access channel occasion 13 (RO13 in the figure) is shared by two random access channel occasion groups (ROG4 and ROG12 in the figure), and so on. Figure 6

[0193] Figure 7 A flowchart of a method in a node for wireless communication is shown. Figure 7 The method shown can include steps S710-S730.

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

[0195] ​At step S720, the first node transmits a first preamble group.

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

[0197] At step S730, in response to transmitting 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 occasion group can be used to determine one or more of the following: determining a start of the first time window, and determining a scrambling sequence of the first random access response.

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

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

[0201] The method embodiments of the present application are described in detail above in combination with Figures 1 to 7 The device embodiments of the present application are described in detail below in combination with Figures 8 to 10 It should be understood that the description of the method embodiments corresponds to the description of the device embodiments, and therefore, the parts not described in detail can refer to the foregoing method embodiments.

[0202] Figure 8 The structural schematic diagram of the first node provided by the embodiments of the present application is shown in FIG. 8. Figure 8 The first node 800 shown in FIG. 8 can 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, and the index of the first synchronization signal block is one of a plurality of candidate synchronization signal block indexes.

[0204] The first transmitter 820 can be configured to transmit a first preamble group, the first preamble group comprising a plurality of preambles; a first set of random access channel occasions, the plurality of random access channel occasions in the first set of random access channel occasions being respectively used for transmitting the plurality of preambles in the first preamble group; any two random access channel occasions in the first set of random access channel occasions being orthogonal in time domain; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of sets of random access channel occasions according to a first mapping order, the first set of random access channel occasions being one of the plurality of sets of random access channel occasions; the first set of random access channel occasions corresponding to a first set type, the first set type being one of a plurality of candidate set types; the index of the first synchronization signal block, the first set type and the first mapping order being used for determining the first set of random access channel occasions.

[0205] As an embodiment, any set of random access channel occasions in the plurality of sets of random access channel occasions belongs to a first periodicity.

[0206] As an embodiment, the first set type comprises a first repetition factor, the first set of random access channel occasions comprising a number of random access channel occasions equal to the first repetition factor, the first repetition factor being one of a plurality of repetition factors.

[0207] As an embodiment, any set of random access channel occasions in the plurality of sets of random access channel occasions corresponds to one of the plurality of candidate set types; the plurality of candidate set types respectively comprising the plurality of repetition factors, a second set of random access channel occasions comprising a number of random access channel occasions equal to a repetition factor comprised in a candidate set type corresponding to the second set of random access channel occasions, wherein the second set of random access channel occasions is any set of random access channel occasions in the plurality of sets of random access channel occasions.

[0208] As an embodiment, the first set type comprises a first frequency hopping indication; the first frequency hopping indication being used for determining whether at least two random access channel occasions in the first set of random access channel occasions occupy different frequency domain resources.

[0209] As an embodiment, the first set type comprises a first frequency hopping pattern; a frequency domain resource occupied by any random access channel occasion in the first set of random access channel occasions corresponds to the first frequency hopping pattern.

[0210] As an embodiment, the index of the first synchronization signal block, the first occasion group type and the first mapping order are used for determining the first random access channel occasion group comprises: the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups according to the first mapping order, the at least two random access channel occasion groups respectively correspond to at least two different candidate occasion group types, and the first occasion group type is used for determining the first random access channel occasion group from the at least two random access channel occasion groups.

[0211] As an embodiment, the index of the first synchronization signal block, the first occasion group type and the first mapping order are used for determining the first random access channel occasion group comprises: the first occasion group type is used for determining at least L random access channel occasion groups from the plurality of random access channel occasion groups, and the index of the first synchronization signal block and the first mapping order are used for determining the first random access channel occasion group from the at least L random access channel occasion groups, L being a positive integer greater than 1.

[0212] As an embodiment, the first mapping order comprises one or more of the following orders: an order of increasing preamble index within one random access channel occasion group in the plurality of random access channel occasion groups; an order of increasing frequency domain resource of the plurality of random access channel occasion groups; an order of increasing time domain resource of the plurality of random access channel occasion groups.

[0213] As an embodiment, the first mapping order comprises: first, an order of increasing preamble index within one random access channel occasion group in the plurality of random access channel occasion groups; second, an order of increasing frequency domain resource of the plurality of random access channel occasion groups; third, an order of increasing time domain resource of the plurality of random access channel occasion groups.

[0214] As an embodiment, the plurality of random access channel occasion groups comprises a plurality of random access channel occasions, each random access channel occasion in the plurality of random access channel occasions comprised by the plurality of random access channel occasion groups belongs to only one random access channel occasion group in the plurality of random access channel occasion groups; or each random access channel occasion is shared by at least two random access channel occasion groups in the plurality of random access channel occasion groups.

[0215] As an embodiment, at least two random access channel occasions in at least one random access channel occasion group in the plurality of random access channel occasion groups belong to two different time slots.

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

[0217] As an embodiment, the first receiver 810 and the first transmitter 820 can be a transceiver 1030. The first node 800 can further include a processor 1010 and a memory 1020, as shown in Figure 10

[0218] Figure 9 A structure diagram of a second node provided by an embodiment of the present application is shown. Figure 9 The second node 900 can include a first transmitter 910 and a first receiver 920, as shown in

[0219] The first transmitter 910 can be configured to transmit one or more synchronization signal blocks, the first synchronization signal block being one of the one or more synchronization signal blocks, and an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes

[0220] The first receiver 920 can be configured to receive a first preamble group, the first preamble group including a plurality of preambles; a first random access channel occasion set including a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion set being respectively used for transmitting the plurality of preambles in the first preamble group; any two random access channel occasions in the first random access channel occasion set being orthogonal in a time domain; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion sets according to a first mapping order, the first random access channel occasion set being one of the plurality of random access channel occasion sets; the first random access channel occasion set corresponding to a first occasion set type, the first occasion set type being one of a plurality of candidate occasion set types; the index of the first synchronization signal block, the first occasion set type, and the first mapping order being used to determine the first random access channel occasion set.

[0221] As an embodiment, any random access channel occasion set in the plurality of random access channel occasion sets belongs to a first period.

[0222] As an embodiment, the first occasion set type includes a first repetition factor, a number of random access channel occasions included in the first random access channel occasion set being equal to the first repetition factor, and the first repetition factor being one of a plurality of repetition factors.

[0223] ​As an embodiment, any of the plurality of random access channel occasion groups corresponds to one of the plurality of candidate occasion group types; the plurality of candidate occasion group types respectively comprise the plurality of repetition factors, and a second random access channel occasion group comprises a number of random access channel occasions equal to a repetition factor comprised in a candidate occasion group type to which the second random access channel occasion group corresponds, wherein the second random access channel occasion group is any of the plurality of random access channel occasion groups.

[0224] As an embodiment, the first occasion group type comprises 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 occasions in the first random access channel occasion group are different.

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

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

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

[0228] As an embodiment, the first mapping order comprises one or more of the following orders: an order of increasing preamble index within one random access channel occasion group in the plurality of random access channel occasion groups; an order of increasing frequency domain resources of the plurality of random access channel occasion groups; an order of increasing time domain resources of the plurality of random access channel occasion groups.

[0229] As an embodiment, the first mapping order comprises: firstly in an ascending order of preamble index within one of the plurality of random access channel occasion groups; secondly in an ascending order of frequency domain resource of the plurality of random access channel occasion groups; thirdly in an ascending order of time domain resource of the plurality of random access channel occasion groups.

[0230] As an embodiment, the plurality of random access channel occasion groups comprises a plurality of random access channel occasions, each of the plurality of random access channel occasions in the plurality of random access channel occasion groups belongs to only one of the plurality of random access channel occasion groups; or each of the plurality of random access channel occasions is shared by at least two of the plurality of random access channel occasion groups.

[0231] As an embodiment, at least two of the plurality of random access channel occasions in at least one of the plurality of random access channel occasion groups belong to two different time slots.

[0232] As an embodiment, the second node 900 comprises: a second transmitter configured to transmit a first random access response in a first time window as a response to receiving the first preamble group; wherein the first random access channel occasion group is used to determine the start of the first time window; the first random access channel occasion 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 can be a transceiver 1030. The second node 900 can further comprise a processor 1010 and a memory 1020, as shown in Figure 10

[0234] Figure 10 is a schematic structural diagram of a communication device according to an embodiment of the present application. Figure 10 The dashed line in the above figure indicates that the unit or module is optional. The device 1000 can be used to implement the methods described in the above method embodiments. The device 1000 can be a chip, a user equipment or a network device.

[0235] ​The apparatus 1000 can include one or more processors 1010. The processor 1010 can support the apparatus 1000 to implement the methods described in the foregoing method embodiments. The processor 1010 can be a general processor or a special-purpose processor. For example, the processor can be a central processing unit (CPU). Alternatively, the processor can also be other general processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, etc. The general processor can be a microprocessor or the processor can also be any conventional processor.

[0236] The apparatus 1000 can also include one or more memories 1030. The memory 1030 stores programs, which can be executed by the processor 1010, so that the processor 1010 performs the methods described in the foregoing method embodiments. The memory 1030 can be independent of the processor 1010 or integrated in the processor 1010.

[0237] The apparatus 1000 can also include a transceiver 1030. The processor 1010 can communicate with other devices or chips through the transceiver 1030. For example, the processor 1010 can perform data transceiving with other devices or chips through the transceiver 1030.

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

[0239] Referring to Figure 11 , Figure 11 The hardware modules of the communication devices provided in the embodiments of the present application are shown. Specifically, Figure 11 A block diagram of the first communication device 450 and the second communication device 410 in communication with each other in an access network is shown.

[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 antennas 420.

[0242] In the transmission from the second communication device 410 to the first communication device 450, upper layer packets from a core network or upper layer packets from the data source 477 are provided to the controller / processor 475 at the second communication device 410. The core network and the data source 477 represent all protocol layers above the L2 layer. The controller / processor 475 implements functionality of the L2 layer. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 475 provides header compression, ciphering, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation for the first communication device 450 based on various priority metrics. The controller / processor 475 is also responsible for retransmission of lost packets, and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the LI layer (i.e., physical layer). The transmit processor 416 implements coding and interleaving to facilitate forward error correction at the second communication device 410, and mapping of coded and modulated symbols onto resource elements. The multi-antenna transmit processor 471 performs digital spatial precoding of the coded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to a subcarrier, multiplexes the stream with reference signals (e.g., pilots), and then performs an inverse fast Fourier transform to produce a 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, and then provides the radio frequency stream to the different antennas 420.

[0243] In transmissions from the second communication device 410 to the first communication device 450, at the first communication device 450, each receiver 454 receives a signal through its respective antenna 452. Each receiver 454 recovers information modulated onto an RF carrier and converts the RF stream into a baseband multicarrier symbol stream, which is provided to the receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 implement various signal processing functions of the LI layer. The multi-antenna receive processor 458 performs receive analog precoding / beamforming operations on the baseband multicarrier symbol stream from the receivers 454. The receive processor 456 converts the baseband multicarrier symbol stream from the receive analog precoding / beamforming operations from the time domain to the frequency domain using a fast Fourier transform. In the frequency domain, the physical layer data signals and the reference signals are demultiplexed by the receive processor 456, where the reference signals will be used for channel estimation, and the data signals are recovered after multi-antenna detection in the multi-antenna receive processor 458 for any spatial streams destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered by the receive processor 456 and generate soft decisions. The receive processor 456 then decodes and de-interleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 410 on the physical channels. 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 can be associated with a memory 460 that stores program codes and data. The memory 460 can be referred to as a computer-readable medium. In transmissions 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, deciphering, header decompression, control signal processing to recover 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 can also be provided to the L3 for L3 processing.

[0244] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, a data source 467 provides upper layer data packets to a controller / processor 459 using the data source 467. The data source 467 represents all protocol layers above the L2 layer. Similar to the transmit function described at the second communication device 410 in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 implements header compression, ciphering, packet segmentation and reordering, and multiplexing between logical and transport channels, L2 layer functionality for the user plane and control plane. The controller / processor 459 is also responsible for retransmission of lost packets, and signaling to the second communication device 410. Transmit processor 468 performs modulation mapping, channel coding processing, multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, and then transmit processor 468 modulates the generated spatial streams into multi-carrier / single-carrier symbol streams, which are further processed by analog precoding / beamforming operations in multi-antenna transmit processor 457 and then provided to different antennas 452 via transmitters 454. Each transmitter 454 first converts the baseband symbol stream provided by multi-antenna transmit processor 457 into a radio frequency signal, and then provides the radio frequency signal to the antenna 452.

[0245] In the transmission from the first communication device 450 to the second communication device 410, the functions at the second communication device 410 are similar to the receive functions described at the first communication device 450 in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives a radio frequency signal through its respective antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to multi-antenna receive processor 472 and receive processor 470. Receive processor 470 and multi-antenna receive processor 472 together implement the functionality of the Ll layer. Controller / processor 475 implements the functionality of the L2 layer. Controller / processor 475 can be associated with a memory 476 that stores program codes and data. The memory 476 can be referred to as a computer readable medium. In the transmission from the first communication device 450 to the second communication device 410, controller / processor 475 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer data packets from the first communication device 450. Upper layer data packets from controller / processor 475 can be provided to the core network or all protocol layers above the L2 layer, and various control signals can be provided to the core network or L3 for L3 processing.

[0246] As one embodiment, the first communication device 450 apparatus includes at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the first communication device 450 apparatus at least to: receive a first synchronization signal block, an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; transmit a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being respectively used for transmitting the plurality of preambles in the first preamble group; any two random access channel occasions in the first random access channel occasion group being orthogonal in time domain; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups; the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of a plurality of candidate occasion group types; the index of the first synchronization signal block, the first occasion group type and the first mapping order being used for determining the first random access channel occasion group.

[0247] As one embodiment, the first communication device 450 apparatus includes a memory storing a program of computer readable instructions to produce actions when executed by at least one processor, the actions comprising: receiving a first synchronization signal block, an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; transmitting a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being respectively used for transmitting the plurality of preambles in the first preamble group; any two random access channel occasions in the first random access channel occasion group being orthogonal in time domain; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups; the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of a plurality of candidate occasion group types; the index of the first synchronization signal block, the first occasion group type and the first mapping order being used for determining the first random access channel occasion group.

[0248] As one embodiment, the first communication device 450 corresponds to a first node in the present application.

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

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

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

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

[0253] As an embodiment, the first communication device 450 is a network-controlled 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, the controller / processor 459 are configured to receive a first synchronization signal block in the present application.

[0257] As an embodiment, the antenna 420, the transmitter 418, the multi-antenna transmission processor 471, the transmission processor 416, the controller / processor 475 are configured to transmit one or more synchronization signal blocks in the present application, and the first synchronization signal block is one of the one or more synchronization signal blocks.

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

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

[0260] The embodiments of the present application further provide a computer readable storage medium for storing a program. The computer readable storage medium can be applied to a terminal or a network device provided by the embodiments of the present application, and the program causes the computer to execute the method performed by the terminal or the network device in the embodiments of the present application.

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

[0262] The embodiment of the present application further provides a computer program. The computer program can be applied to the terminal or the network device provided by the embodiment of the present application, and the computer program causes the computer to execute the method performed by the terminal or the network device in the various embodiments of the present application.

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

[0264] In the embodiments of the present application, the "indication" mentioned can be direct indication, or indirect indication, or can be an indication of an associated relationship. For example, A indicates B, which can mean that B can be obtained by A, for example, B can be obtained by A; or it can mean that A indirectly indicates B, for example, A indicates C, and B can be obtained by C; or it can mean that A and B have an associated relationship.

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

[0266] In the embodiments of the present application, the term "corresponding" can mean that there is a direct or indirect corresponding relationship between the two, or it can mean that there is an associated relationship between the two, or it can mean an indication and being indicated, configuration and being configured, etc.

[0267] In the embodiments of the present application, "predefined" or "preconfigured" can be realized by pre-saving corresponding codes, tables or other ways that can be used to indicate related information in the device (for example, including user equipment and network equipment), and the present application does not limit the specific implementation manner. For example, predefinition can mean definition in a protocol.

[0268] In the embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field, for example, it can include the LTE protocol, the NR protocol and the related protocol applied to the future communication system, and the present application does not limit this.

[0269] The term "and / or" in the embodiments of the present application is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects.

[0270] In various embodiments of the present application, the size of the sequence number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0271] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented by other means. For example, the above-described device embodiments are only schematic, and the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0272] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple network units. According to actual needs, part or all of the units can be selected to achieve the purpose of the present embodiment.

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

[0274] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented 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, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another 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 through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. 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, data center and the like integrated with one or more available media sets. The available media can be magnetic media (for example, floppy disk, hard disk, magnetic tape), optical media (for example, digital video disc (DVD)) or semiconductor media (for example, solid state disk (SSD)) and the like.

[0275] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method in a first node for wireless communication, characterized by, Comprising: receiving a first synchronization signal block, an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; transmitting a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion group being respectively used for transmitting the plurality of preambles in the first preamble group; any two random access channel occasions in the first random access channel occasion group being orthogonal in time domain; in response to transmitting the first preamble group, receiving a first random access response, the first random access response being associated with the plurality of preambles; wherein the plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the plurality of random access channel occasion groups; the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of a plurality of candidate occasion group types; the first occasion group type being used for indicating a number of random access channel occasions in the first random access channel occasion group and / or a frequency hopping pattern of the first random access channel occasion group; the index of the first synchronization signal block, the first occasion group type and the first mapping order being used for determining the first random access channel occasion group.

2. The method of claim 1, wherein, Any random access channel occasion group in the plurality of random access channel occasion groups comprises a plurality of random access channel occasions.

3. The method according to claim 1 or 2, characterized in that, Each random access channel occasion in the first random access channel occasion group is valid.

4. The method according to claim 1 or 2, characterized in that, A preamble index of each preamble in the first preamble group is the same.

5. The method according to claim 1 or 2, characterized in that, The plurality of preambles in the first preamble group are transmitted using a same spatial filter.

6. The method of claim 1 or 2, wherein, The mapping of the plurality of candidate synchronization signal block indexes to the plurality of random access channel occasion groups is performed in a first period; the first period starts from a frame number 0; the first period is one association mode period, the association mode period comprising one or more association periods.

7. The method according to claim 1 or 2, characterized in that, The first occasion group type comprises a first repetition factor, a number of random access channel occasions comprised in the first random access channel occasion group being equal to the first repetition factor, the first repetition factor being one of a plurality of repetition factors, the plurality of repetition factors comprising 2, 4 and 8.

8. The method of claim 7, wherein, Any random access channel occasion group in the plurality of random access channel occasion groups corresponds to one of the plurality of candidate occasion group types; the plurality of candidate occasion group types respectively comprising the plurality of repetition factors, a second random access channel occasion group comprising a number of random access channel occasions equal to a second repetition factor, the second repetition factor being one of the plurality of repetition factors, wherein the second random access channel occasion group is any random access channel occasion group in the plurality of random access channel occasion groups.

9. The method of claim 1 or 2, wherein, The first occasion group type comprises a first frequency hopping indication; the first frequency hopping indication being used for determining whether frequency domain resources occupied by at least two random access channel occasions in the first random access channel occasion group are different.

10. The method of claim 1 or 2, wherein, The first occasion group type comprises a first frequency hopping pattern; and a frequency domain resource occupied by any random access channel occasion in the first random access channel occasion group corresponds to the first frequency hopping pattern.

11. The method of claim 1 or 2, wherein, The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group, comprising: According to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups, and the at least two random access channel occasion groups correspond to at least two different candidate occasion group types respectively; and the first occasion group type is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

12. The method of claim 1 or 2, wherein, The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group, comprising: The first occasion group type is a first repetition factor, and the first repetition factor is one of a plurality of repetition factors; according to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups, and the at least two random access channel occasion groups correspond to at least two repetition factors in the plurality of repetition factors respectively; and the first repetition factor is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

13. The method of claim 1 or 2, wherein, The index of the first synchronization signal block, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group, comprising: The first occasion group type is used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel occasion group from the at least L random access channel occasion groups, L being a positive integer greater than 1.

14. The method of claim 1 or 2, wherein, The first mapping order comprises one or more of the following orders: an order of increasing preamble index within one random access channel occasion group in the plurality of random access channel occasion groups; an order of increasing frequency domain resource index of the plurality of random access channel occasion groups; an order of increasing time domain resource index of the plurality of random access channel occasion groups.

15. The method of claim 14, wherein, The first mapping order comprises: first, an order of increasing preamble index within one random access channel occasion group in the plurality of random access channel occasion groups; second, an order of increasing frequency domain resource index of the plurality of random access channel occasion groups; and third, an order of increasing time domain resource index of the plurality of random access channel occasion groups.

16. The method of claim 1 or 2, wherein, The multiple random access channel occasion groups include multiple random access channel occasions, each random access channel occasion in the multiple random access channel occasions belongs to only one of the multiple random access channel occasion groups; or each random access channel occasion is shared by at least two of the multiple random access channel occasion groups.

17. The method of claim 1 or 2, wherein, At least two random access channel occasions in at least one of the multiple random access channel occasion groups belong to two different time slots.

18. The method of claim 1 or 2, wherein, The receiving the first random access response comprises: The first random access response is received within a first time window; The first random access channel occasion group is used to determine the start of the first time window; and the first random access channel occasion group is used to determine a scrambling sequence of the first random access response.

19. A method in a second node for wireless communication, the method comprising: Comprise: Transmitting one or more synchronization signal blocks, a first synchronization signal block being one of the one or more synchronization signal blocks, an index of the first synchronization signal block being one of multiple candidate synchronization signal block indexes; Receiving a first preamble group, the first preamble group including multiple preambles; a first random access channel occasion group including multiple random access channel occasions, the multiple random access channel occasions in the first random access channel occasion group being respectively used to transmit the multiple preambles in the first preamble group; and any two random access channel occasions in the first random access channel occasion group being orthogonal in a time domain; In response to receiving the first preamble group, transmitting a first random access response, the first random access response being associated with the multiple preambles; The multiple candidate synchronization signal block indexes are mapped to multiple random access channel occasion groups according to a first mapping order, the first random access channel occasion group being one of the multiple random access channel occasion groups; the first random access channel occasion group corresponding to a first occasion group type, the first occasion group type being one of multiple candidate occasion group types; the first occasion group type being used to indicate a number of random access channel occasions in the first random access channel occasion group and / or a frequency hopping pattern of the first random access channel occasion group; and the index of the first synchronization signal block, the first occasion group type, and the first mapping order being used to determine the first random access channel occasion group.

20. The method of claim 19, wherein, Any random access channel occasion group of the multiple random access channel occasion groups includes multiple random access channel occasions.

21. The method of claim 19 or 20, wherein, Each random access channel occasion in the first random access channel occasion group is valid.

22. The method of claim 19 or 20, wherein, A preamble index of each preamble in the first preamble group is the same.

23. The method of claim 19 or 20, wherein, The multiple preambles in the first preamble group are transmitted using the same spatial filter.

24. The method of claim 19 or 20, wherein, The mapping of the multiple candidate synchronization signal block indexes to the multiple random access channel occasion groups is performed within a first period; the first period starts from a frame number 0; and the first period is an association mode period, the association mode period including one or more association periods.

25. The method of claim 19 or 20, wherein, The first occasion group type comprises a first repetition factor, a number of random access channel occasions comprised in the first random access channel occasion group is equal to the first repetition factor, the first repetition factor is one of a plurality of repetition factors, the plurality of repetition factors comprises 2, 4 and 8.

26. The method of claim 25, wherein, Any random access channel occasion group in the plurality of random access channel occasion groups corresponds to one of the plurality of candidate occasion group types; the plurality of candidate occasion group types respectively comprise the plurality of repetition factors, a number of random access channel occasions comprised in a second random access channel occasion group is equal to a second repetition factor, the second repetition factor is one of the plurality of repetition factors, wherein the second random access channel occasion group is any random access channel occasion group in the plurality of random access channel occasion groups.

27. The method of claim 19 or 20, wherein, The first occasion group type comprises 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 occasions in the first random access channel occasion group are different.

28. The method of claim 19 or 20, wherein, The first occasion group type comprises a first frequency hopping pattern; frequency domain resources occupied by any random access channel occasion in the first random access channel occasion group correspond to the first frequency hopping pattern.

29. The method of claim 19 or 20, wherein, The index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, comprising: According to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups, the at least two random access channel occasion groups respectively correspond to at least two different candidate occasion group types, and the first occasion group type is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

30. The method of claim 19 or 20, wherein, The index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, comprising: The first occasion group type is a first repetition factor, the first repetition factor is one of a plurality of repetition factors; according to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups, at least two random access channel occasion groups respectively correspond to at least two repetition factors in the plurality of repetition factors, and the first repetition factor is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

31. The method of claim 19 or 20, wherein, The index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, comprising: The first occasion group type is used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups, the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel occasion group from the at least L random access channel occasion groups, and L is a positive integer greater than 1.

32. The method of claim 19 or 20, wherein, The first mapping order comprises one or more of the following orders: an order of increasing preamble index within one of the plurality of random access channel occasion groups; an order of increasing frequency domain resource index of the plurality of random access channel occasion groups; an order of increasing time domain resource index of the plurality of random access channel occasion groups.

33. The method of claim 32, wherein, The first mapping order comprises: first, an order of increasing preamble index within one of the plurality of random access channel occasion groups; second, an order of increasing frequency domain resource index of the plurality of random access channel occasion groups; third, an order of increasing time domain resource index of the plurality of random access channel occasion groups.

34. The method of claim 19 or 20, wherein, The plurality of random access channel occasion groups comprises a plurality of random access channel occasions, each of the plurality of random access channel occasions of the plurality of random access channel occasion groups belongs to only one of the plurality of random access channel occasion groups; or each of the plurality of random access channel occasions is shared by at least two of the plurality of random access channel occasion groups.

35. The method of claim 19 or 20, wherein, At least two of the plurality of random access channel occasions of at least one of the plurality of random access channel occasion groups belong to two different time slots.

36. The method of claim 19 or 20, wherein, The sending the first random access response comprises: sending the first random access response within a first time window; wherein the first random access channel occasion group is used to determine a start of the first time window; and the first random access channel occasion group is used to determine a scrambling sequence of the first random access response.

37. A first node for wireless communication, the first node comprising: comprises: a first receiver configured to receive a first synchronization signal block, an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; a first transmitter configured to transmit a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel occasion group comprising a plurality of random access channel occasions, the plurality of random access channel occasions of the first random access channel occasion group being respectively used to transmit the plurality of preambles of the first preamble group; any two of the plurality of random access channel occasions of the first random access channel occasion group being orthogonal in time domain; a second receiver configured to receive, as a response to the transmission of the first preamble group, a first random access response, the first random access response being associated with the plurality of preambles; and a third receiver configured to receive, as a response to the transmission of the first preamble group, a second random access response, the second random access response being associated with the plurality of preambles. The first synchronization signal block index, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group.

38. The first node of claim 37, wherein, Any random access channel occasion group of the plurality of random access channel occasion groups comprises a plurality of random access channel occasions.

39. The first node of claim 37 or 38, characterized by Each random access channel occasion in the first random access channel occasion group is valid.

40. The first node of claim 37 or 38, characterized by A preamble index of each preamble in the first preamble group is the same.

41. The first node of claim 37 or 38, characterized by The plurality of preambles in the first preamble group are transmitted using a same spatial filter.

42. The first node of claim 37 or 38, characterized by Mapping of the plurality of candidate synchronization signal block indexes to the plurality of random access channel occasion groups is performed in a first period; the first period starts from a frame number 0; the first period is an association mode period, and the association mode period comprises one or more association periods.

43. The first node of claim 37 or 38, characterized by The first occasion group type comprises a first repetition factor, and a number of random access channel occasions included in the first random access channel occasion group is equal to the first repetition factor; the first repetition factor is one of a plurality of repetition factors, and the plurality of repetition factors comprise 2, 4, and 8.

44. The first node of claim 43, wherein, Any random access channel occasion group of the plurality of random access channel occasion groups corresponds to one of the plurality of candidate occasion group types; the plurality of candidate occasion group types respectively comprise the plurality of repetition factors, and a number of random access channel occasions included in a second random access channel occasion group is equal to a second repetition factor, the second repetition factor being one of the plurality of repetition factors, wherein the second random access channel occasion group is any random access channel occasion group of the plurality of random access channel occasion groups.

45. The first node of claim 37 or 38, characterized by The first occasion group type comprises 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 occasions in the first random access channel occasion group are different.

46. The first node of claim 37 or 38, characterized by The first occasion group type comprises a first frequency hopping pattern; frequency domain resources occupied by any random access channel occasion in the first random access channel occasion group correspond to the first frequency hopping pattern.

47. The first node of claim 37 or 38, characterized by The first synchronization signal block index, the first occasion group type, and the first mapping order are used to determine the first random access channel occasion group, comprising: According to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel occasion groups of the plurality of random access channel occasion groups, the at least two random access channel occasion groups respectively correspond to at least two different candidate occasion group types, and the first occasion group type is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

48. The first node of claim 37 or 38, characterized by The index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, including: The first occasion group type is a first repetition factor, the first repetition factor is one of a plurality of repetition factors; according to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel occasion groups of the plurality of random access channel occasion groups, at least two random access channel occasion groups respectively correspond to at least two repetition factors of the plurality of repetition factors, and the first repetition factor is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

49. The first node of claim 37 or 38, characterized by The index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, including: The first occasion group type is used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel occasion group from the at least L random access channel occasion groups, L is a positive integer greater than 1.

50. The first node of claim 37 or 38, characterized by The first mapping order includes one or more of the following orders: According to the increasing order of preamble index within one random access channel occasion group of the plurality of random access channel occasion groups; According to the increasing order of frequency domain resource index of the plurality of random access channel occasion groups; According to the increasing order of time domain resource index of the plurality of random access channel occasion groups.

51. The first node of claim 50, wherein, The first mapping order includes: first, according to the increasing order of preamble index within one random access channel occasion group of the plurality of random access channel occasion groups; second, according to the increasing order of frequency domain resource index of the plurality of random access channel occasion groups; third, according to the increasing order of time domain resource index of the plurality of random access channel occasion groups.

52. The first node of claim 37 or 38, characterized by The plurality of random access channel occasion groups include a plurality of random access channel occasions, each random access channel occasion of the plurality of random access channel occasions included in the plurality of random access channel occasion groups belongs to only one random access channel occasion group of the plurality of random access channel occasion groups; or each random access channel occasion is shared by at least two random access channel occasion groups of the plurality of random access channel occasion groups.

53. The first node of claim 37 or 38, characterized by At least two random access channel occasions in at least one random access channel occasion group of the plurality of random access channel occasion groups belong to two different time slots.

54. The first node of claim 37 or 38, characterized by The second receiver is configured to receive a first random access response, including: The second receiver is configured to receive the first random access response within a first time window. The first random access channel occasion set is used to determine a start of the first time window; and the first random access channel occasion set is used to determine a scrambling sequence of the first random access response.

55. A second node for wireless communication, comprising: The method comprises: The first transmitter is configured to transmit one or more synchronization signal blocks, a first synchronization signal block being one of the one or more synchronization signal blocks, an index of the first synchronization signal block being one of a plurality of candidate synchronization signal block indexes; The first receiver is configured to receive a first preamble group, the first preamble group comprising a plurality of preambles; a first random access channel occasion set comprising a plurality of random access channel occasions, the plurality of random access channel occasions in the first random access channel occasion set being respectively used to transmit the plurality of preambles in the first preamble group; any two random access channel occasions in the first random access channel occasion set being orthogonal in time domain; The second transmitter is configured to transmit, as a response to receiving the first preamble group, a first random access response, the first random access response being associated with the plurality of preambles; The plurality of candidate synchronization signal block indexes are mapped to a plurality of random access channel occasion sets according to a first mapping order, the first random access channel occasion set being one of the plurality of random access channel occasion sets; the first random access channel occasion set corresponds to a first occasion set type, the first occasion set type being one of a plurality of candidate occasion set types; the first occasion set type is used to indicate a number of random access channel occasions in the first random access channel occasion set and / or a frequency hopping pattern of the first random access channel occasion set; the index of the first synchronization signal block, the first occasion set type and the first mapping order are used to determine the first random access channel occasion set.

56. The second node of claim 55, wherein, Any random access channel occasion set in the plurality of random access channel occasion sets comprises a plurality of random access channel occasions.

57. The second node of claim 55 or 56, characterized by Each random access channel occasion in the first random access channel occasion set is valid.

58. The second node of claim 55 or 56, characterized by A preamble index of each preamble in the first preamble group is the same.

59. The second node of claim 55 or 56, characterized by The plurality of preambles in the first preamble group are transmitted using a same spatial filter.

60. The second node of claim 55 or 56, characterized by The mapping of the plurality of candidate synchronization signal block indexes to the plurality of random access channel occasion sets is performed within a first period; the first period starts from a frame number 0; the first period is one association mode period, the association mode period comprising one or more association periods.

61. The second node of claim 55 or 56, characterized by, The first occasion set type comprises a first repetition factor, a number of random access channel occasions comprised in the first random access channel occasion set being equal to the first repetition factor, the first repetition factor being one of a plurality of repetition factors, the plurality of repetition factors comprising 2, 4 and 8.

62. The second node of claim 61, characterized by Any of the plurality of random access channel occasion groups corresponds to one of the plurality of candidate occasion group types; the plurality of candidate occasion group types respectively comprise the plurality of repetition factors, a second random access channel occasion group comprises a number of random access channel occasions equal to a second repetition factor, the second repetition factor being one of the plurality of repetition factors, wherein the second random access channel occasion group is any of the plurality of random access channel occasion groups.

63. The second node of claim 55 or 56, characterized by The first occasion group type comprises 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 occasions in the first random access channel occasion group are different.

64. The second node of claim 55 or 56, characterized by The first occasion group type comprises a first frequency hopping pattern; frequency domain resources occupied by any random access channel occasion in the first random access channel occasion group correspond to the first frequency hopping pattern.

65. The second node of claim 55 or 56, characterized by The index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, comprising: According to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups, the at least two random access channel occasion groups respectively correspond to at least two different candidate occasion group types, and the first occasion group type is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

66. The second node of claim 55 or 56, characterized by The index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, comprising: The first occasion group type is a first repetition factor, the first repetition factor being one of a plurality of repetition factors; according to the first mapping order, the index of the first synchronization signal block is mapped to at least two random access channel occasion groups in the plurality of random access channel occasion groups, the at least two random access channel occasion groups respectively correspond to at least two repetition factors in the plurality of repetition factors, and the first repetition factor is used to determine the first random access channel occasion group from the at least two random access channel occasion groups.

67. The second node of claim 55 or 56, characterized by The index of the first synchronization signal block, the first occasion group type and the first mapping order are used to determine the first random access channel occasion group, comprising: The first occasion group type is used to determine at least L random access channel occasion groups from the plurality of random access channel occasion groups, and the index of the first synchronization signal block and the first mapping order are used to determine the first random access channel occasion group from the at least L random access channel occasion groups, L being a positive integer greater than 1.

68. The second node of claim 55 or 56, characterized by The first mapping order comprises one or more of the following orders: In ascending order of preamble index within one of the plurality of random access channel occasion groups; In ascending order of frequency domain resource index of the plurality of random access channel occasion groups; In ascending order of frequency domain resource index of the plurality of random access channel occasion groups; in ascending order of time domain resource indexes of the plurality of random access channel occasion groups.

69. The second node of claim 68, characterized by The first mapping order comprises: first, in ascending order of preamble indexes within one random access channel occasion group of the plurality of random access channel occasion groups; second, in ascending order of frequency domain resource indexes of the plurality of random access channel occasion groups; third, in ascending order of time domain resource indexes of the plurality of random access channel occasion groups.

70. The second node of claim 55 or 56, characterized by The plurality of random access channel occasion groups comprises a plurality of random access channel occasions, each random access channel occasion of the plurality of random access channel occasions of the plurality of random access channel occasion groups belongs to only one random access channel occasion group of the plurality of random access channel occasion groups; or each random access channel occasion is shared by at least two random access channel occasion groups of the plurality of random access channel occasion groups.

71. The second node of claim 55 or 56, characterized by At least two random access channel occasions of at least one random access channel occasion group of the plurality of random access channel occasion groups belong to two different time slots.

72. The second node of claim 55 or 56, characterized by The second transmitter is configured to transmit a first random access response, comprising: The second transmitter is configured to transmit the first random access response within a first time window. The first random access channel occasion group is used to determine a start of the first time window; and the first random access channel occasion group is used to determine a scrambling sequence of the first random access response.

73. A first node for wireless communication, comprising: A memory, a processor and a transceiver, the memory is configured to store a program, the processor is configured to invoke the program in the memory, so that the first node executes the method in any one of claims 1-18.

74. A second node for wireless communication, comprising: A memory, a processor and a transceiver, the memory is configured to store a program, the processor is configured to invoke the program in the memory, so that the second node executes the method in any one of claims 19-36.

75. A communications device, characterized by A processor configured to invoke a program from a memory, so that the communication device executes the method in any one of claims 1-36.

76. A chip, comprising: A processor configured to invoke a program from a memory, so that the device installed with the chip executes the method in any one of claims 1-36.

77. A computer readable storage medium, characterized in that, A computer having a program stored thereon, the program causes the computer to execute the method in any one of claims 1-36.

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