METHOD AND APPARATUS FOR USE IN NODE FOR WIRELESS COMMUNICATION

Abstract

This application discloses a method and apparatus for use in a wireless communication node. A first node receives a first information block, wherein the first information block indicates a first set of symbols; the first node selects a target RO from a first group of ROs, and sends a random access preamble on the target RO, wherein the first set of symbols comprises at least one symbol configured as a downlink symbol by TDD uplink / downlink configuration signaling and used for uplink transmission, the first group of ROs comprises at least some ROs associated with a first SSB index in an SSB-RO mapping cycle, and at least some ROs depend on whether the first group of ROs comprises an RO in the first set of symbols.This application optimizes the design of the random access process, supports scenarios where ROs in SBFD symbols are used for random access, solves the problem of conflict between the RO configuration and SBFD symbols, improves uplink coverage, and reduces access latency.

Description

A method and device used in a node for wireless communication Technical Field

[0001] The present application relates to a transmission method and apparatus in a wireless communication system, and in particular to a method and apparatus for a random access process. Background Art

[0002] The application scenarios of future wireless communication systems are becoming increasingly diverse, and different scenarios place varying demands on system performance. To meet these diverse performance requirements, the 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) plenary meeting #72 decided to conduct research on New Radio (NR) (or 5G). The WI (Work Item) for New Radio (NR) technology was approved at the 3GPP RAN plenary meeting #75, initiating standardization work on NR.

[0003] In existing NR systems, spectrum resources are statically divided into FDD (Frequency Division Duplexing) and TDD (Time Division Duplexing) spectrum. For TDD spectrum, both base stations and user equipment (UE) operate in half-duplex mode. This half-duplex mode avoids self-interference and mitigates the impact of cross-link interference (CLI), but it also leads to reduced resource utilization and increased latency. To address these issues, supporting flexible duplex modes or variable link directions (uplink, downlink, or flexible) in TDD or FDD spectrum has become a possible solution. At the 3GPP RAN#88e meeting and the 3GPP Rel-18 (Release 18) workshop, supporting more flexible duplex modes or full-duplex modes in NR Rel-18 received extensive attention and discussion, particularly the sub-band non-overlapping full-duplex (SBFD) mode on the gNB (NR Node B). Communications in this mode are subject to severe interference, including self-interference and CLI. To address the interference problem, advanced interference cancellation technologies are required, including antenna isolation, beamforming, RF (Radio Frequency) level interference cancellation, and digital interference cancellation.

[0004] Summary of the Invention

[0005] In the current standard, the UE selects an SSB before sending a random access preamble. The UE selects an RO and preamble from the RO set and preambles associated with the selected SSB. The base station determines the SSB selected by the UE based on the association between the RO detected in the preamble and the SSB, and then determines the downlink transmit beam. The association relationship between the SSB mapped to the valid RO supports three situations: many-to-one, one-to-one, and one-to-many. In TDD mode, the RO configured by the base station is not necessarily valid. The UE still needs to determine whether a RO can be used to send a preamble based on the frame structure. Among them, when the UE has received the frame structure configuration tdd-UL-DL-ConfigurationCommon signaling, the valid RO includes the RO on the UL (UpLink) symbol. In the SBFD scenario, in addition to UL symbols, SBFD symbols can also be used for uplink transmission by SBFD-aware UEs. Therefore, when the RO configured by the base station overlaps with the SBFD symbol, whether the SSB can be mapped to the RO on the SBFD symbol and whether the RO on the SBFD symbol can send the preamble are issues that need to be resolved.

[0006] In response to the above problems, the present application discloses a solution. It should be noted that although the original intention of this application is for SBFD scenarios, this application can also be applied to other non-SBFD scenarios; further, adopting a unified design solution for different scenarios (such as other non-SBFD scenarios, including but not limited to capacity enhancement systems, short-range communication systems, unlicensed frequency domain communications, IoT (Internet of Things), URLLC (Ultra Reliable Low Latency Communication) networks, vehicle networks, etc.) can also help reduce hardware complexity and costs. In the absence of conflict, the embodiments and features in any node of the present application can be applied to any other node. In the absence of conflict, the embodiments and features in the embodiments of the present application can be arbitrarily combined with each other.

[0007] In particular, the interpretation of terminology, nouns, functions, and variables in this application (unless otherwise specified) may refer to the definitions in the 3GPP specification protocols TS38 series and TS37 series. If necessary, reference may be made to 3GPP standards TS38.211, TS38.212, TS38.213, TS38.214, TS38.215, TS38.300, TS38.304, TS38.305, TS38.321, TS38.331, TS37.355, and TS38.423 to assist in understanding this application.

[0008] As an example, the interpretation of the terms in this application refers to the definitions of the 3GPP specification protocol TS38 series.

[0009] As an example, the interpretation of the terms in this application refers to the definitions of the TS37 series of specification protocols of 3GPP.

[0010] As an embodiment, the interpretation of terms in this application refers to the definition of the standard protocol of the IEEE (Institute of Electrical and Electronics Engineers).

[0011] The present application discloses a method in a first node for wireless communication, comprising:

[0012] receiving a first information block, the first information block indicating a first set of symbols;

[0013] selecting a target RO from the first RO group, and sending a random access preamble in the target RO;

[0014] The first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping cycle, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

[0015] As an embodiment, the problem to be solved by the present application includes: in an SBFD scenario, how the first node selects an RO for random access.

[0016] As an embodiment, the problem to be solved by the present application includes: in an SBFD scenario, when the RO used for random access overlaps with the SBFD symbol, whether the RO on the SBFD symbol can be selected by the first node to send a random access preamble.

[0017] As an embodiment, the characteristics of the above method include: in the SBFD scenario, the present application introduces a first RO group, and the first node selects an RO from the first RO group to send a random access preamble, thereby solving the above problem.

[0018] As an embodiment, the characteristics of the above method include: in the SBFD scenario, the present application introduces a first RO group, and determines whether the RO on the SBFD symbol can be selected by the first node for sending a random access preamble based on whether the first RO group includes the RO on the SBFD symbol.

[0019] As an embodiment, the characteristics of the above method include: the SSB-RO cyclic mapping is for legacy UE, and the present application is applicable to the case where one SSB is mapped to multiple ROs.

[0020] As an embodiment, the characteristics of the above method include: the present application is applicable to the case where legacy UE and SBFD-aware UE adopt unified or separate RO configurations.

[0021] As an embodiment, the benefits of the above method include: optimizing the random access process design and being applicable to the random access process in a full-duplex scenario.

[0022] As an embodiment, the benefits of the above method include: when the first RO group includes the RO in the first symbol set, uplink coverage can be increased and access delay can be reduced.

[0023] As an embodiment, the above method has the following advantages: when the first RO group does not include the RO in the first symbol set, little change is made to the current standard, and the method has good backward compatibility.

[0024] According to one aspect of the present application, the above method is characterized in that it includes:

[0025] receiving a second information block, where the second information block indicates a first RO set;

[0026] Each RO in the first RO set is mapped to the first SSB index, and at least one RO among the ROs included in the first RO group belongs to the first RO set.

[0027] As an embodiment, the characteristics of the above method include: the first RO group includes at least one RO applicable to legacy UE.

[0028] As an embodiment, the benefits of the above method include: ensuring that legacy UEs can also access the network normally, and improving transmission reliability.

[0029] As an embodiment, the benefits of the above method include: reducing waste and redundancy of resources and lowering network costs.

[0030] As an embodiment, the benefits of the above method include: improving the probability of successful random access.

[0031] According to one aspect of the present application, the above method is characterized in that it includes:

[0032] receiving first signaling, where the first signaling indicates a first PRACH mask index value;

[0033] Among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

[0034] As an embodiment, the characteristics of the above method include: the present application is applicable to a contention-free random access process.

[0035] As an embodiment, the benefits of the above method include: dynamically adjusting access policies and resource allocation according to network load conditions and user access requirements, thereby providing better network performance and user experience.

[0036] As an embodiment, the benefits of the above method include: it can effectively manage and schedule user access, thereby improving network throughput and capacity.

[0037] According to one aspect of the present application, the above method is characterized in that the more ROs included in the first symbol set are included in the first RO group, the fewer ROs included in the at least part of the ROs.

[0038] As an embodiment, the characteristics of the above method include: the number of ROs included in the first RO group is fixed or configurable.

[0039] As an embodiment, the above method has the following benefits: avoiding excessive network cost caused by too many ROs included in the first RO group, and achieving a balance between ROs on SBFD symbols and legacy valid ROs.

[0040] According to one aspect of the present application, the above method is characterized in that, when the first RO group does not include the RO in the first symbol set, the first RO group includes all ROs associated with the first SSB index in an SSB-RO mapping cycle; when the first RO group includes the RO in the first symbol set, the first RO group includes part of the RO associated with the first SSB index in an SSB-RO mapping cycle.

[0041] As an embodiment, the characteristics of the above method include: when the RO on the SBFD symbol can be used for random access, when the UE selects SSB, there is still an opportunity to select the legacy RO for random access.

[0042] As an embodiment, the advantages of the above method include: minor changes to the standard and good backward compatibility.

[0043] As an embodiment, the above method has the following advantages: it can be flexibly applied to different terminals, and reduces the requirements on terminal capabilities.

[0044] As an embodiment, the benefits of the above method include: ensuring that legacy UEs can also access the network normally.

[0045] According to one aspect of the present application, the above method is characterized in that it includes:

[0046] receiving a target information block;

[0047] The target information block indicates whether the first symbol set is used for random access; when the first symbol set is used for random access, the first RO group includes the ROs in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the ROs in the first symbol set.

[0048] As an embodiment, the problem to be solved by the present application includes: how to determine whether the RO occupying the full-duplex symbol is valid in the SBFD scenario.

[0049] As an embodiment, the characteristics of the above method include: in the SBFD scenario, the present application solves the problem by explicitly or implicitly indicating whether the full-duplex symbol is used for random access through the target information block.

[0050] As an embodiment, the characteristics of the above method include: when the target information block indicates that the first symbol set is not used for random access, the first node assumes that the RO occupying full-duplex symbols is not a valid RO.

[0051] As an embodiment, the benefits of the above method include: the base station can flexibly indicate whether full-duplex symbols are used for random access according to the current interference environment and resource configuration.

[0052] As an embodiment, the benefits of the above method include: when the target information block indicates that the first symbol set is used for random access, uplink coverage is increased.

[0053] As an embodiment, the above method has the following advantages: it can be flexibly applied to different terminals, and reduces the requirements on terminal capabilities.

[0054] According to one aspect of the present application, the above method is characterized in that, when the first RO group does not include the RO in the first symbol set, the first node selects the target RO from the first RO group with equal probability; when the first RO group includes the RO in the first symbol set, the first node preferentially selects the target RO from K1 ROs in the first RO group, and the K1 ROs do not include the RO in the first symbol set.

[0055] As an embodiment, the problem to be solved by the present application includes: how the first node selects an RO for random access in an SBFD scenario.

[0056] As an embodiment, the characteristics of the above method include: in the SBFD scenario, the present application adopts different RO selection methods according to whether the first RO group includes the RO in the first symbol set, thereby solving the above problem.

[0057] As an embodiment, the characteristics of the above method include: when the first node selects a target RO, the probability of the K1 ROs being selected is the same.

[0058] As an embodiment, the above method has the following advantages: when the ROs in the first RO group do not occupy full-duplex symbols, the RO selection method in the current standard is followed, the standard is modified slightly, and the method has good backward compatibility.

[0059] As an embodiment, the benefits of the above method include: compared with half-duplex symbols, the interference environment on full-duplex symbols is more complex, and the probability of failure of performing a random access process on full-duplex symbols is relatively greater. Therefore, when the first RO group includes both ROs that occupy full-duplex symbols and ROs that do not occupy full-duplex symbols, the first node preferentially selects the RO that does not occupy full-duplex symbols to initiate random access, which is beneficial to improving the success rate of the random access process.

[0060] As an embodiment, the benefits of the above method include: when the RO on the full-duplex symbol initiates random access, in order to ensure that the random access is as successful as possible, the UE may need a higher power or a larger step size to send the random access preamble. The first node preferentially selects the RO that does not occupy the full-duplex symbol to initiate random access, which is beneficial to reducing UE power and saving energy.

[0061] According to one aspect of the present application, the above method is characterized in that the first node includes a user equipment.

[0062] According to one aspect of the present application, the above method is characterized in that the first node includes a relay node.

[0063] The present application discloses a method in a second node for wireless communication, which includes:

[0064] sending a first information block, wherein the first information block indicates a first set of symbols;

[0065] Receiving a random access preamble in a target RO;

[0066] The receiver of the first information block selects the target RO from the first RO group; the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping loop, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

[0067] According to one aspect of the present application, the above method is characterized in that it includes:

[0068] Sending a second information block, where the second information block indicates the first RO set;

[0069] Each RO in the first RO set is mapped to the first SSB index, and at least one RO among the ROs included in the first RO group belongs to the first RO set.

[0070] According to one aspect of the present application, the above method is characterized in that it includes:

[0071] Sending first signaling, where the first signaling indicates a first PRACH mask index value;

[0072] Among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

[0073] According to one aspect of the present application, the above method is characterized in that the more ROs included in the first symbol set are included in the first RO group, the fewer ROs included in the at least part of the ROs.

[0074] According to one aspect of the present application, the above method is characterized in that, when the first RO group does not include the RO in the first symbol set, the first RO group includes all ROs associated with the first SSB index in an SSB-RO mapping cycle; when the first RO group includes the RO in the first symbol set, the first RO group includes part of the RO associated with the first SSB index in an SSB-RO mapping cycle.

[0075] According to one aspect of the present application, the above method is characterized in that it includes:

[0076] Send target information block;

[0077] The target information block indicates whether the first symbol set is used for random access; when the first symbol set is used for random access, the first RO group includes the ROs in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the ROs in the first symbol set.

[0078] According to one aspect of the present application, the above method is characterized in that, when the first RO group does not include the RO in the first symbol set, the receiver of the first information block selects the target RO from the first RO group with equal probability; when the first RO group includes the RO in the first symbol set, the receiver of the first information block preferentially selects the target RO from K1 ROs in the first RO group, and the K1 ROs do not include the RO in the first symbol set.

[0079] According to one aspect of the present application, the above method is characterized in that the second node is a base station.

[0080] According to one aspect of the present application, the above method is characterized in that the second node is a user equipment.

[0081] According to one aspect of the present application, the above method is characterized in that the second node is a relay node.

[0082] The present application discloses a device for a first node used for wireless communication, comprising:

[0083] A first receiver receives a first information block, wherein the first information block indicates a first set of symbols;

[0084] A first transmitter selects a target RO from a first RO group and sends a random access preamble in the target RO;

[0085] The first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping cycle, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

[0086] The present application discloses a device for a second node used for wireless communication, comprising:

[0087] A second transmitter sends a first information block, where the first information block indicates a first set of symbols;

[0088] a second receiver, receiving a random access preamble in a target RO;

[0089] The receiver of the first information block selects the target RO from the first RO group; the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping loop, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

[0090] As an embodiment, compared with the traditional solution, the present application has the following advantages but not limited to:

[0091] Enhance the random access process design in SBFD scenarios to increase uplink coverage and reduce access latency while ensuring random access success rate.

[0092] It can be flexibly applied to different terminals, reducing the requirements on terminal capabilities;

[0093] User access can be effectively managed and scheduled, thereby improving network throughput and capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0095] FIG1 shows a flow chart of first node transmission according to an embodiment of the present application;

[0096] FIG2 shows a schematic diagram of a network architecture according to an embodiment of the present application;

[0097] FIG3 is a schematic diagram showing an embodiment of a radio protocol architecture of a user plane and a control plane according to an embodiment of the present application;

[0098] FIG4 shows a schematic diagram of a first communication device and a second communication device according to an embodiment of the present application;

[0099] FIG5 shows a flow chart of transmission between a first node and a second node according to an embodiment of the present application;

[0100] FIG6 is a schematic diagram showing the relationship between ROs in the first RO set and the first SSB index according to an embodiment of the present application;

[0101] FIG7 is a schematic diagram showing the relationship between the first symbol set and the first RO group according to an embodiment of the present application;

[0102] FIG8 is a schematic diagram showing the relationship between a first PRACH mask index value and a first RO group according to an embodiment of the present application;

[0103] FIG9 is a schematic diagram showing a relationship between the number of ROs included in at least part of the ROs and the number of ROs included in the first RO group according to one embodiment of the present application;

[0104] FIG10 is a schematic diagram showing the relationship between at least part of the ROs and whether the first RO group includes the ROs in the first symbol set according to an embodiment of the present application;

[0105] FIG11 is a schematic diagram showing how the first node selects a target RO according to an embodiment of the present application;

[0106] FIG12 shows a schematic diagram of ROs included in a first RO group according to an embodiment of the present application;

[0107] FIG13 is a schematic diagram showing symbols in a first symbol set according to an embodiment of the present application;

[0108] FIG14 shows a structural block diagram of a processing device used in a first node according to an embodiment of the present application;

[0109] FIG15 shows a structural block diagram of a processing device used in a second node according to an embodiment of the present application. DETAILED DESCRIPTION

[0110] The technical solution of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other in any way.

[0111] Example 1

[0112] Example 1 illustrates a flowchart of a first node transmission according to an embodiment of the present application, as shown in FIG1 . In FIG1 , each box represents a step. In particular, the order of the steps in the boxes does not represent a specific temporal relationship between the steps.

[0113] In step 101 , the first node receives a first information block indicating a first symbol set; in step 102 , the first node selects a target RO from a first RO group and sends a random access preamble in the target RO.

[0114] In embodiment 1, the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping loop, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

[0115] As an embodiment, the RO refers to: PRACH (Physical Random Access CHannel, physical random access channel) Occasion, PRACH opportunity.

[0116] As an embodiment, the RO refers to: RACH (Random Access CHannel, random access channel) Occasion, RACH opportunity.

[0117] As an embodiment, the RO refers to: RA (Random Access) Occasion.

[0118] As an embodiment, the TDD refers to: Time Division Duplex.

[0119] As an embodiment, the TDD refers to: Time Division Duplexing.

[0120] As an embodiment, the SSB refers to: Synchronization Signal Block.

[0121] As an embodiment, the SSB refers to: SS (Synchronization Signal) / PBCH (Physical Broadcast CHannel) block, synchronization signal / physical broadcast channel block.

[0122] Typically, the reception occasions of PBCH, PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal) are in consecutive symbols and form an SS / PBCH block.

[0123] As an embodiment, the first information block is carried by higher layer signaling.

[0124] As an embodiment, the first information block is carried by RRC (Radio Resource Control) signaling.

[0125] As an embodiment, the first information block includes information in at least one RRC IE (Information Element).

[0126] As an embodiment, the first information block includes part or all of the fields included in an RRC IE.

[0127] As an embodiment, the first information block includes part or all of the fields included in each RRC IE in multiple RRC IEs.

[0128] As an embodiment, the first information block includes part or all of the fields included in a SIB (System Information Block).

[0129] As an embodiment, the first information block includes part or all of the fields included in the MIB (Master Information Block).

[0130] As an embodiment, the first information block includes part or all of the fields included in SIB1 (System Information Block 1).

[0131] As an embodiment, the first information block includes part or all of the fields included in RMSI (Remaining Minimum System Information).

[0132] As an embodiment, the first information block is cell-common.

[0133] As an embodiment, the first information block is cell-specific.

[0134] As an embodiment, the first information block is group-common.

[0135] As an embodiment, the first information block is user equipment (UE)-dedicated.

[0136] As an embodiment, the first information block is configured per subband.

[0137] As an embodiment, the first information block is configured per BWP (BandWidth Part).

[0138] As an embodiment, the name of the RRC signaling carrying the first information block includes "TDD".

[0139] As an embodiment, the name of the RRC signaling carrying the first information block includes "DL".

[0140] As an embodiment, the name of the RRC signaling carrying the first information block includes "UL".

[0141] As an embodiment, the name of the RRC signaling carrying the first information block includes "Config".

[0142] As an embodiment, the name of the RRC signaling carrying the first information block includes "SBFD".

[0143] As an embodiment, the name of the RRC signaling carrying the first information block includes "subband".

[0144] As an embodiment, the name of the RRC signaling carrying the first information block includes "duplex".

[0145] As an embodiment, the first information block is carried by a MAC CE (Medium Access Control layer Control Element).

[0146] As an embodiment, the first information block includes information in at least one MAC CE.

[0147] As an embodiment, the first information block is carried by dynamic signaling.

[0148] As an embodiment, the first information block is carried by physical layer signaling.

[0149] As an embodiment, the first information block is carried by DCI.

[0150] As an embodiment, the first information block includes information in at least one RRC IE and information in at least one DCI.

[0151] As an embodiment, the first information block includes part or all of the fields in a DCI format.

[0152] As an embodiment, the first information block includes part or all of the fields in DCI format 2_N, where N is a non-negative integer.

[0153] As an embodiment, the first information block includes part or all of the fields in DCI format 2_8.

[0154] As an embodiment, the first information block is used to configure SBFD (SubBand non-overlapping Full Duplex) time slots or symbols.

[0155] As an embodiment, the first information block is used to configure a time slot or symbol supporting full duplex.

[0156] As an embodiment, the first symbol set includes at least one symbol.

[0157] As an embodiment, the first symbol set includes multiple symbols.

[0158] As an embodiment, the first symbol set includes multiple symbols, and the multiple symbols are continuous.

[0159] As an embodiment, the first symbol set includes multiple symbols, and at least two symbols among the multiple symbols are discontinuous.

[0160] As an embodiment, the symbols included in the first symbol set constitute one or more time slots.

[0161] As an embodiment, the first symbol set includes some symbols in a time slot.

[0162] As an embodiment, the first symbol set includes all symbols of each time slot in at least one time slot, and includes partial symbols of each time slot in at least one time slot.

[0163] Typically, one time slot described in this application includes 14 symbols.

[0164] As an embodiment, the time domain resource occupied by the symbols included in the first symbol set is a period.

[0165] As an embodiment, the first symbol set includes at least one full-duplex symbol.

[0166] As an embodiment, the first symbol set includes at least one SBFD symbol.

[0167] As an embodiment, all symbols included in the first symbol set are full-duplex symbols.

[0168] As an embodiment, all symbols included in the first symbol set are SBFD symbols.

[0169] As an embodiment, the first information block explicitly indicates the first set of symbols.

[0170] As an embodiment, the first information block implicitly indicates the first set of symbols.

[0171] As an embodiment, the first information block indicates the time domain positions of the symbols included in the first symbol set.

[0172] As an embodiment, the first information block indicates the time domain position of the time slot included in the first symbol set.

[0173] As an embodiment, the first information block indicates a period of symbols included in the first symbol set.

[0174] As an embodiment, the first information block indicates a period of time slots included in the first symbol set.

[0175] As an embodiment, the first information block indicates the position of the symbols included in the first symbol set in a time slot.

[0176] As an embodiment, the first information block indicates the positions of the symbols included in the first symbol set in a period.

[0177] As an embodiment, the first information block indicates the position of the time slots included in the first symbol set in a cycle.

[0178] As an embodiment, the first information block indicates the time slots occupied by the symbols included in the first symbol set.

[0179] As an embodiment, the first information block indicates the time domain position of the time slot occupied by the symbols included in the first symbol set.

[0180] As an embodiment, the first information block indicates the position of the time slots occupied by the symbols included in the first symbol set in a cycle.

[0181] As an embodiment, the symbol described in this application is a single-carrier symbol.

[0182] As an embodiment, the symbol described in this application is a multi-carrier symbol.

[0183] As an embodiment, the multi-carrier symbol described in the present application is a SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbol.

[0184] As an embodiment, the multi-carrier symbol in the present application is a FBMC (Filter Bank Multi Carrier) symbol.

[0185] As an embodiment, the multi-carrier symbol in the present application is an OFDM (Orthogonal Frequency Division Multiplexing) symbol.

[0186] As an embodiment, the symbols described in the present application are obtained by performing OFDM symbol generation on the output of a transform precoding.

[0187] As an embodiment, the multi-carrier symbol described in the present application is a DFT-s-OFDM (Discrete Fourier Transform-spread-OFDM) symbol.

[0188] As an embodiment, the multi-carrier symbols described in the present application include CP-OFDM (Cyclic Prefix-OFDM) symbols.

[0189] As an embodiment, the RO described in this application occupies at least one subcarrier in the frequency domain.

[0190] As an embodiment, the RO described in this application occupies at least one symbol in the time domain.

[0191] As an embodiment, the RO described in this application occupies at least one RE (Resource Element).

[0192] Typically, one RE occupies one symbol in the time domain and one subcarrier in the frequency domain.

[0193] As an embodiment, the frequency domain resources occupied by the RO in this application belong to a UL (UpLink) carrier.

[0194] As an embodiment, the frequency domain resources occupied by the RO in this application belong to a UL (UpLink, uplink) carrier or a DL (DownLink, downlink) carrier.

[0195] As an embodiment, the first RO group includes at least one RO.

[0196] As an embodiment, the first node selects the target RO from a first RO group.

[0197] As an embodiment, the first node selects the target RO from the first RO group by itself.

[0198] As an embodiment, the first node implements the relevant selection of the target RO from the first RO group.

[0199] As an embodiment, the first node randomly selects the target RO from all ROs included in the first RO group.

[0200] As an embodiment, the first node selects the target RO from all ROs included in the first RO group with equal probability.

[0201] As an embodiment, the first node preferentially selects the target RO from some ROs included in the first RO group.

[0202] As an embodiment, the receiver of the random access preamble can determine the first SSB index based on the target RO and the random access preamble sent in the target RO.

[0203] As an embodiment, the first node assumes that all ROs in the first RO group are mapped to a first SSB index.

[0204] As an embodiment, the first node sends a random access preamble in the target RO.

[0205] As an embodiment, the random access preamble sent by the first node in the target RO is selected by a MAC entity of the first node from among random access preambles used for contention-based random access (CBRA).

[0206] As an embodiment, the random access preamble sent by the first node in the target RO is allocated by the sender of the first information block.

[0207] As an embodiment, the random access preamble sent by the first node in the target RO is configured by the sender of the first information block.

[0208] As an embodiment, the random access preamble sent by the first node in the target RO is indicated by the sender of the first information block.

[0209] As an embodiment, the preamble in the present application includes a random access preamble.

[0210] As an embodiment, the preamble in the present application includes a preamble sequence.

[0211] As an embodiment, the preamble in the present application includes a pseudo-random sequence.

[0212] As an embodiment, the preamble in the present application includes a ZC (Zaddoff Chu) sequence.

[0213] As an embodiment, the RO described in this application corresponds to one or more preambles.

[0214] As an embodiment, the RO described in this application corresponds to one or more leading indexes.

[0215] As an embodiment, the RO described in this application corresponds to one or more leading sequences.

[0216] As an embodiment, the RO described in this application is configured to transmit one or more preambles.

[0217] As an embodiment, the RO in this application is configured to transmit one or more preamble indexes.

[0218] As an embodiment, the RO described in this application is configured to transmit one or more preamble sequences.

[0219] As an embodiment, the first symbol set includes at least one symbol configured as a downlink symbol by the TDD uplink and downlink configuration signaling and used for uplink transmission

[0220] As an embodiment, the TDD uplink and downlink configuration signaling includes higher layer signaling.

[0221] As an embodiment, the TDD uplink and downlink configuration signaling includes semi-static signaling.

[0222] As an embodiment, the TDD uplink and downlink configuration signaling includes cell common signaling.

[0223] As an embodiment, the TDD uplink and downlink configuration signaling includes UE group common signaling.

[0224] As an embodiment, the TDD uplink and downlink configuration signaling includes UE-specific signaling.

[0225] As an embodiment, the link direction configuration configured by the TDD uplink and downlink configuration signaling is applicable to the entire frequency band occupied by the serving cell.

[0226] As an embodiment, the link direction configuration configured by the TDD uplink and downlink configuration signaling is applicable to the entire carrier to which it belongs.

[0227] As an embodiment, the TDD uplink and downlink configuration signaling includes RRC signaling.

[0228] As an embodiment, the TDD uplink and downlink configuration signaling includes one or more RRC IEs.

[0229] As an embodiment, the TDD uplink and downlink configuration signaling includes multiple RRC IEs.

[0230] As an embodiment, the TDD uplink and downlink configuration signaling includes one or more fields of each RRC IE in multiple RRC IEs.

[0231] As an embodiment, the TDD uplink and downlink configuration signaling is an RRC IE.

[0232] As an embodiment, the TDD uplink and downlink configuration signaling is one or more fields in an RRC IE.

[0233] As an embodiment, the TDD uplink and downlink configuration signaling includes TDD-UL-DL-ConfigCommon IE.

[0234] As an embodiment, the TDD uplink and downlink configuration signaling includes TDD-UL-DL-ConfigDedicatedIE.

[0235] As an embodiment, the TDD uplink and downlink configuration signaling includes TDD-UL-DL-ConfigCommon IE and TDD-UL-DL-ConfigDedicated IE.

[0236] As an embodiment, the TDD uplink and downlink configuration signaling includes at least the former of TDD-UL-DL-ConfigCommon IE and TDD-UL-DL-ConfigDedicated IE.

[0237] As an embodiment, the TDD uplink and downlink configuration signaling includes a TDD-UL-DL-Pattern field.

[0238] As an embodiment, the TDD uplink and downlink configuration signaling indicates the downlink time slot and downlink symbol within the period.

[0239] As an embodiment, at least one time slot in the TDD uplink and downlink configuration signaling indication period is a downlink time slot and / or at least one symbol is a downlink symbol.

[0240] As an embodiment, the TDD uplink and downlink configuration signaling indicates at least one time slot format, and the at least one time slot format is used to determine at least one downlink symbol.

[0241] As an embodiment, the TDD uplink and downlink configuration signaling is used to indicate at least one time slot including only downlink symbols and at least one downlink symbol following the time slot including only downlink symbols from one cycle.

[0242] As an embodiment, the TDD uplink and downlink configuration signaling indicates the number of starting downlink time slots within a cycle, the number of downlink symbols immediately following the starting downlink time slot, and the cycle length.

[0243] As an embodiment, the TDD uplink and downlink configuration signaling is used to indicate at least one pattern, and any pattern indicated by the TDD uplink and downlink configuration signaling provides a time slot configuration cycle length, the number of time slots including only downlink symbols, the number of downlink symbols, the number of time slots including only uplink symbols, and the number of uplink symbols.

[0244] As an embodiment, the TDD uplink and downlink configuration signaling is used to indicate at least one pattern, and the at least one pattern indicated by the TDD uplink and downlink configuration signaling provides at least one time slot in a period that includes only downlink symbols and at least one downlink symbol that does not belong to a time slot that includes only downlink symbols.

[0245] As an embodiment, the TDD uplink and downlink configuration signaling includes MAC CE.

[0246] As an embodiment, the TDD uplink and downlink configuration signaling includes dynamic signaling.

[0247] As an embodiment, the TDD uplink and downlink configuration signaling includes physical layer signaling.

[0248] As an embodiment, the TDD uplink and downlink configuration signaling includes layer 1 signaling.

[0249] As an embodiment, the TDD uplink and downlink configuration signaling includes DCI.

[0250] As an embodiment, the CRC (Cyclic Redundancy Check) of the TDD uplink and downlink configuration signaling is scrambled by the cell-public RNTI (Radio Network Temporary Identifier).

[0251] As an embodiment, the CRC of the TDD uplink and downlink configuration signaling is scrambled by the RNTI common to the UE group.

[0252] As an embodiment, the CRC of the TDD uplink and downlink configuration signaling is scrambled by SFI (Slot Format Indicator)-RNTI.

[0253] As an embodiment, the TDD uplink and downlink configuration signaling DCI is SFI.

[0254] As an embodiment, the format adopted by the TDD uplink and downlink configuration signaling is DCI format 2_0.

[0255] As an embodiment, the TDD uplink and downlink configuration signaling includes RRC layer signaling and physical layer signaling.

[0256] As an embodiment, the TDD uplink and downlink configuration signaling is carried jointly by RRC layer signaling and physical layer signaling.

[0257] As a sub-embodiment of this embodiment, the RRC signaling includes at least the former of the TDD-UL-DL-ConfigCommon IE and the TDD-UL-DL-ConfigDedicated IE.

[0258] As a sub-embodiment of this embodiment, the physical layer signaling includes a partial or complete field of a DCI.

[0259] As a sub-embodiment of this embodiment, the physical layer signaling is SFI.

[0260] As an embodiment, the first information block is carried by the TDD uplink and downlink configuration signaling.

[0261] As an embodiment, the first information block includes part of the information in the TDD uplink and downlink configuration signaling.

[0262] As an embodiment, the first information block and the TDD uplink and downlink configuration signaling belong to different domains of the same RRC IE.

[0263] As a sub-embodiment of this embodiment, the benefits of the above method include: saving signaling overhead.

[0264] As an embodiment, the first information block and the TDD uplink and downlink configuration signaling belong to different RRC IEs.

[0265] As a sub-embodiment of this embodiment, the benefits of the above method include: flexible indication.

[0266] As an embodiment, one SSB-RO mapping cycle means that all SSBs transmitted within one SSB cycle are mapped to the RO once.

[0267] As an embodiment, the one SSB cycle described in this application is carried by SIB1.

[0268] As an embodiment, one SSB period described in this application is 5 milliseconds (ms).

[0269] As an embodiment, the SSB transmitted in an SSB cycle described in this application is indicated by the sender of the first information block.

[0270] As an embodiment, the SSB transmitted in an SSB cycle described in this application is configured by the sender of the first information block.

[0271] As an embodiment, the one SSB-RO mapping cycle means that all SSBs transmitted in one SSB burst (discovery burst) are mapped to RO once.

[0272] As an embodiment, the period information of an SSB burst set described in this application is carried by SIB1.

[0273] As an embodiment, the period of an SSB burst set described in this application is 5ms.

[0274] As an embodiment, the SSB transmitted in an SSB burst set described in the present application is indicated by the sender of the first information block.

[0275] As an embodiment, the SSB transmitted in an SSB burst set described in this application is configured by the sender of the first information block.

[0276] As an embodiment, the first node assumes that the period of an SSB burst set described in this application is equal to the period of an SSB described in this application.

[0277] As an embodiment, the one SSB-RO mapping cycle is used to determine the mapping relationship between all SSB indexes and ROs in a time window.

[0278] As an embodiment, the one SSB-RO mapping cycle is used to determine at least one of the time domain position or the frequency domain position of the RO mapped to all SSB indexes in a time window.

[0279] As an embodiment, the order in which an SSB index is mapped to RO in the SSB-RO mapping cycle is: first, arranged in ascending order of the random access preamble index within an RO; second, multiple frequency-division multiplexed ROs are arranged in ascending order of the frequency resource index; then, the time-division multiplexed ROs within a PRACH time slot are arranged in ascending order of the time resource index; finally, arranged in ascending order of the PRACH time slot index.

[0280] As an embodiment, the order in which an SSB index is mapped to RO in the SSB-RO mapping cycle is: first, multiple frequency-division multiplexed ROs are arranged in ascending order of frequency resource index; second, time-division multiplexed ROs within a PRACH time slot are arranged in ascending order of time resource index; finally, they are arranged in ascending order of the PRACH time slot index.

[0281] As an embodiment, the association period described in the present application includes at least the one SSB-RO mapping cycle.

[0282] As an embodiment, one SSB-RO mapping cycle corresponds to one association period.

[0283] As an embodiment, the one SSB-RO mapping cycle corresponds to a cycle formed by all ROs associated with an SSB index in an association period.

[0284] As an embodiment, an association cycle includes one or more RO sets associated with one SSB index, and any RO set of the one or more RO sets corresponds to one SSB-RO mapping cycle.

[0285] As a sub-embodiment of this embodiment, any RO set among the multiple RO sets indexes the ROs in an ascending manner.

[0286] As a sub-embodiment of this embodiment, the indexing mode of ROs in any two RO sets among the multiple RO sets is repeated.

[0287] As a sub-embodiment of this embodiment, the number of ROs included in any RO set among the multiple RO sets is indicated by higher layer signaling, or by DCI (Downlink Control Information).

[0288] As an embodiment, one association period described in the present application corresponds to a minimum period corresponding to Q1 SSB indexes mapped to at least one RO, where Q1 is a positive integer greater than 1.

[0289] As a sub-embodiment of this embodiment, the Q1 is the 3GPP (3rd Generation Partner Project) TS (Technical Specification) 38.213.

[0290] As a sub-embodiment of this embodiment, Q1 is the total number of SSB indexes configured by the sender of the first information block.

[0291] As a sub-embodiment of this embodiment, Q1 is the total number of SSB indexes configured by the first node.

[0292] As a sub-embodiment of this embodiment, Q1 is the total number of SSBs transmitted in one SSB cycle described in this application.

[0293] As a sub-embodiment of this embodiment, Q1 is the total number of SSBs transmitted in an SSB burst in this application.

[0294] As an embodiment, an association period described in the present application is an integer multiple of a PRACH configuration period including at least one SSB-RO cyclic mapping.

[0295] As a sub-embodiment of this embodiment, the PRACH configuration period is configured by the sender of the first information block.

[0296] As a sub-embodiment of this embodiment, the PRACH configuration period is indicated by the sender of the first information block.

[0297] As a sub-embodiment of this embodiment, the association period is no greater than 160ms.

[0298] As a sub-embodiment of this embodiment, the association period is predefined.

[0299] As a sub-embodiment of this embodiment, the mapping between the association period and the PRACH configuration period refers to Table 8.1-1 in 3GPP TS 38.213.

[0300] As an embodiment, in one association period described in this application, there is one RO that is not mapped to an SSB.

[0301] As an embodiment, all ROs in one association cycle described in this application are mapped to SSB.

[0302] As an embodiment, the first SSB index is an SSB Index.

[0303] As an embodiment, the first SSB index is an SSB-Index.

[0304] As an embodiment, the first SSB index is a non-negative integer.

[0305] As an embodiment, the first SSB index is not greater than 7.

[0306] As an embodiment, the first SSB index is no greater than 63.

[0307] As an embodiment, the first SSB index identifies an SSB.

[0308] As an embodiment, the SSB identified by the first SSB index is transmitted within one SSB cycle.

[0309] As an embodiment, the SSB identified by the first SSB index is transmitted in an SSB burst set.

[0310] As an embodiment, the first SSB index is mapped to multiple ROs.

[0311] As an embodiment, the first SSB index is mapped to multiple ROs in one SSB-RO cyclic mapping.

[0312] As an embodiment, the SSB described in this application refers to: SS / PBCH block, synchronization signal block.

[0313] As an embodiment, the SSB described in this application refers to: Synchronisation Signal / Physical Broadcast CHannel block.

[0314] Typically, the reception occasions of PBCH (Physical Broadcast CHannel), PSS (Primary Synchronization Signal), and SSS (Secondary Synchronization Signal) are in consecutive symbols and form an SS / PBCH block.

[0315] As an embodiment, the RO associated with the first SSB index in the SSB-RO mapping cycle is for legacy UEs.

[0316] As an embodiment, the RO associated with the first SSB index in the one SSB-RO mapping cycle is for Rel-17 (Release-17) UE.

[0317] As an embodiment, the RO associated with the first SSB index in the SSB-RO mapping cycle is for UE versions before Rel-17.

[0318] As an embodiment, the random access preamble sent by the first node in the target RO is associated with the first SSB index.

[0319] As an embodiment, the at least part of the ROs depends on whether the first RO group includes ROs in the first symbol set.

[0320] As an embodiment, the first RO group includes the ROs in the first symbol set.

[0321] As an embodiment, the first RO group does not include the ROs in the first symbol set.

[0322] As an embodiment, the first RO group includes ROs in the first symbol set and ROs outside the first symbol set.

[0323] As an embodiment, the “RO in the first symbol set” means that the time domain resources occupied by the RO include the first symbol set.

[0324] As an embodiment, the “RO in the first symbol set” means that the time domain resources occupied by the RO belong to the first symbol set.

[0325] As an embodiment, the “RO in the first symbol set” means that the time domain resources occupied by the RO overlap with the first symbol set.

[0326] As an embodiment, the “RO in the first symbol set” means that at least one symbol among the symbols occupied by the RO belongs to the first symbol set.

[0327] As an embodiment, the “RO in the first symbol set” means that all symbols occupied by the RO belong to the first symbol set.

[0328] As an embodiment, the “RO outside the first symbol set” means that the time domain resources occupied by the RO do not include the first symbol set.

[0329] As an embodiment, the “RO outside the first symbol set” means that the time domain resources occupied by the RO do not belong to the first symbol set.

[0330] As an embodiment, the “RO outside the first symbol set” means that the time domain resources occupied by the RO are orthogonal to the first symbol set.

[0331] As an embodiment, the “RO outside the first symbol set” means that the symbol occupied by the RO does not belong to the first symbol set.

[0332] As an embodiment, the “RO outside the first symbol set” means that the RO does not occupy a symbol in the first symbol set.

[0333] As an embodiment, the number of ROs included in the first RO group is configured by the sender of the first information block.

[0334] As an embodiment, the number of ROs included in the first RO group is indicated by the sender of the first information block.

[0335] As an embodiment, the number of ROs included in the first RO group is predefined.

[0336] As an embodiment, the number of ROs included in the first RO group is equal to the number of ROs associated with the first SSB index in the one SSB-RO mapping cycle.

[0337] As an embodiment, the number of ROs included in the first RO group is smaller than the number of ROs associated with the first SSB index in the one SSB-RO mapping cycle.

[0338] As an embodiment, the first RO group includes ROs in the first symbol set, and the first RO group includes part of ROs associated with the first SSB index in an SSB-RO mapping cycle.

[0339] As an embodiment, the first RO group includes ROs in the first symbol set, and the first RO group includes all ROs associated with the first SSB index in one SSB-RO mapping cycle.

[0340] As an embodiment, the first RO group does not include ROs in the first symbol set, and the first RO group includes all ROs associated with the first SSB index in one SSB-RO mapping cycle.

[0341] As an embodiment, the first RO group does not include ROs in the first symbol set, and the first RO group includes some ROs associated with the first SSB index in an SSB-RO mapping cycle.

[0342] Example 2

[0343] Example 2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application, as shown in Figure 2.

[0344] Figure 2 illustrates the network architecture for LTE (Long-Term Evolution), LTE-A (Long-Term Evolution Advanced), and future 5G systems. The network architecture for LTE, LTE-A, and future 5G systems is called EPS (Evolved Packet System). The 5G NR or LTE network architecture may be referred to as 5GS (5G System) / EPS 200 or some other appropriate terminology. 5GS / EPS 200 may include one or more UEs 201, a UE 241 for sidelink (SL) communication with UE 201, NG-RAN (Next Generation Radio Access Network) 202, 5G-CN (5G Core Network) / EPC (Evolved Packet Core) 210, HSS (Home Subscriber Server) / UDM (Unified Data Management) 220, and Internet services 230. 5GS / EPS 200 may interconnect with other access networks, but these entities / interfaces are not shown for simplicity. As shown in FIG2 , 5GS / EPS 200 provides packet-switched services. However, those skilled in the art will readily appreciate that the various concepts presented throughout this disclosure can be extended to networks providing circuit-switched services. NG-RAN 202 includes NR Node B (gNB) 203 and other gNBs 204. The gNB 203 provides user and control plane protocol termination towards the UE 201. The gNB 203 may be connected to other gNBs 204 via an Xn interface (e.g., backhaul). The gNB 203 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a Basic Service Set (BSS), an Extended Service Set (ESS), a Transmitter Receiver Point (TRP), or some other suitable terminology. The gNB 203 provides an access point to the 5G-CN / EPC 210 for the UE 201.Examples of UE 201 include a cellular phone, a smartphone, a Session Initiation Protocol (SIP) phone, a laptop computer, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a drone, an aircraft, a narrowband physical network device, a machine type communication device, a land vehicle, an automobile, a wearable device, or any other similarly functional device. Those skilled in the art may also refer to UE 201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. The gNB 203 connects to the 5G-CN / EPC 210 via the S1 / NG interface. The 5G-CN / EPC 210 includes the MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MMEs / AMFs / SMFs 214, the S-GW (Service Gateway) / UPF (User Plane Function) 212, and the P-GW (Packet Data Network Gateway) / UPF 213. The MME / AMF / SMF 211 is a control node that handles signaling between the UE 201 and the 5G-CN / EPC 210. Generally, the MME / AMF / SMF 211 provides bearer and connection management. All user IP (Internet Protocol) packets are routed through S-GW / UPF 212, which itself is connected to P-GW / UPF 213. The P-GW provides UE IP address allocation and other functions. P-GW / UPF 213 is connected to Internet Services 230. Internet Services 230 includes carrier-specific Internet Protocol services, specifically the Internet, intranet, IMS (IP Multimedia Subsystem), and packet switching services.

[0345] As an embodiment, the first node in the present application includes the UE 201.

[0346] As an embodiment, the second node in the present application includes the gNB 203.

[0347] As an embodiment, the UE 201 supports relay transmission.

[0348] As an embodiment, the UE 201 includes a mobile phone.

[0349] As an embodiment, the UE 201 is a vehicle including a car.

[0350] As an embodiment, the gNB 203 is a macro cell base station.

[0351] As an embodiment, the gNB 203 is a micro cell base station.

[0352] As an embodiment, the gNB 203 is a pico cell base station.

[0353] As an embodiment, the gNB 203 is a home base station (Femtocell).

[0354] As an embodiment, the gNB 203 is a base station device that supports large delay difference.

[0355] As an embodiment, the gNB 203 is a flying platform device.

[0356] As an embodiment, the gNB 203 is a satellite device.

[0357] As an embodiment, the gNB 203 is a test device (e.g., a transceiver that simulates some functions of a base station, a signaling tester).

[0358] As an embodiment, the wireless link from the UE 201 to the gNB 203 is an uplink, which is used to perform uplink transmission.

[0359] As an embodiment, the wireless link from the gNB 203 to the UE 201 is a downlink, which is used to perform downlink transmission.

[0360] As an embodiment, the wireless link between the UE 201 and the gNB 203 includes a cellular network link.

[0361] As an embodiment, the UE 201 and the gNB 203 are connected via a Uu air interface.

[0362] As an embodiment, the sender of the first information block includes the gNB 203.

[0363] As an embodiment, the receiver of the first information block includes the UE 201.

[0364] As an embodiment, the sender of the random access preamble includes the UE 201.

[0365] As an embodiment, the recipient of the random access preamble includes the gNB 203.

[0366] As an embodiment, the gNB 203 supports SBFD.

[0367] As an embodiment, the gNB 203 supports a more flexible duplex mode or a full-duplex mode.

[0368] As an embodiment, the UE 201 supports SBFD.

[0369] As an embodiment, the UE 201 supports a more flexible duplex mode or a full-duplex mode.

[0370] Example 3

[0371] Embodiment 3 illustrates a schematic diagram of an embodiment of a wireless protocol architecture of a user plane and a control plane according to an embodiment of the present application, as shown in FIG3 .

[0372] FIG3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300. FIG3 illustrates the radio protocol architecture for a first communication node device (a UE or RSU (Road Side Unit) in a V2X (Vehicle to Everything) network, a vehicle-mounted device, or a vehicle-mounted communication module) and a second node device (a gNB, a UE or RSU in a V2X network, a vehicle-mounted device, or a vehicle-mounted communication module), or the control plane 300 between two UEs using three layers: Layer 1 (L1), Layer 2 (L2), and Layer 3 (L3). L1 is the lowest layer and implements various PHY (PHYsical layer) signal processing functions. L1 will be referred to herein as PHY 301. L2 305 is above PHY 301 and is responsible for the link between the first and second node devices, or between two UEs, through PHY 301. L2305 includes a MAC (Medium Access Control) sublayer 302, an RLC (Radio Link Control) sublayer 303, and a PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the second node device. The PDCP sublayer 304 provides multiplexing between different radio bearers and logical channels. The PDCP sublayer 304 also provides security by encrypting data packets, and provides support for inter-zone mobility of the first communication node device between the second communication node devices. The RLC sublayer 303 provides segmentation and reassembly of upper layer data packets, retransmission of lost data packets, and reordering of data packets to compensate for out-of-order reception due to HARQ (Hybrid Automatic Repeat reQuest process number). The MAC sublayer 302 provides multiplexing between logical and transport channels. The MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) in a cell between the first communication node devices. The MAC sublayer 302 is also responsible for HARQ operations. The RRC (Radio Resource Control) sublayer 306 in L3 of the control plane 300 is responsible for obtaining radio resources (ie, radio bearers) and configuring lower layers using RRC signaling between the second communication node device and the first communication node device.The radio protocol architecture of the user plane 350 includes Layer 1 (L1) and Layer 2 (L2). The radio protocol architecture for the first and second communication node devices in the user plane 350 is substantially the same as the corresponding layers and sublayers in the control plane 300 for the physical layer 351, the PDCP sublayer 354 in L2 355, the RLC sublayer 353 in L2 355, and the MAC sublayer 352 in L2 355. However, the PDCP sublayer 354 also provides header compression for upper layer data packets to reduce radio transmission overhead. L2 355 in the user plane 350 also includes the SDAP (Service Data Adaptation Protocol) sublayer 356, which is responsible for mapping QoS (Quality of Service) flows and Data Radio Bearers (DRBs) to support service diversity. Although not shown in the figure, the first communication node device may have several upper layers above L2355, including a network layer (e.g., IP (Internet Protocol) layer) terminated at the P-GW on the network side and an application layer terminated at the other end of the connection (e.g., a remote UE, a server, etc.).

[0373] As an embodiment, the wireless protocol architecture in FIG3 is applicable to the first node in this application.

[0374] As an embodiment, the wireless protocol architecture in FIG3 is applicable to the second node in this application.

[0375] As an embodiment, the first information block is generated in the RRC 306.

[0376] As an embodiment, the first information block is generated in the MAC sublayer 302 or the MAC sublayer 352.

[0377] As an embodiment, the first information block is generated by the PHY 301 or PHY 351.

[0378] As an embodiment, the random access preamble is generated by the PHY 301 or PHY 351.

[0379] As an embodiment, the higher layer in this application refers to a layer above the physical layer.

[0380] As an embodiment, the higher layer in the present application includes a MAC layer.

[0381] As an embodiment, the higher layer in the present application includes an RRC layer.

[0382] Example 4

[0383] Embodiment 4 illustrates a schematic diagram of a first communication device and a second communication device according to an embodiment of the present application, as shown in Figure 4. Figure 4 is a block diagram of a first communication device 410 and a second communication device 450 communicating with each other in an access network.

[0384] The first communications device 410 includes a controller / processor 475 , a memory 476 , a receive processor 470 , a transmit processor 416 , a multi-antenna receive processor 472 , a multi-antenna transmit processor 471 , a transmitter / receiver 418 , and an antenna 420 .

[0385] The second 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 .

[0386] In transmission from the first communications device 410 to the second communications device 450, at the first communications device 410, upper layer data packets from the core network are provided to the controller / processor 475. The controller / processor 475 implements L2 functionality. In the DL, the controller / processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and allocation of radio resources to the second communications device 450 based on various priority metrics. The controller / processor 475 is also responsible for HARQ operations, retransmission of lost packets, and signaling to the second communications device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 (i.e., physical layer). The transmit processor 416 performs coding and interleaving to facilitate forward error correction (FEC) at the second communication device 450, as well as mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-ary phase shift keying (M-PSK), and M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital spatial precoding on the coded and modulated symbols, including codebook-based and non-codebook-based precoding and beamforming, to generate one or more parallel streams. The transmit processor 416 then maps each parallel stream to a subcarrier, multiplexes the modulated symbols with a reference signal (e.g., a pilot) in the time and / or frequency domain, and then uses an inverse fast Fourier transform (IFFT) to generate a physical channel carrying the time-domain multi-carrier symbol stream. The multi-antenna transmit processor 471 then performs transmit analog precoding / beamforming operations on the time-domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream, which is then provided to a different antenna 420.

[0387] During transmission from the first communication device 410 to the second communication device 450, at the second communication device 450, each receiver 454 receives a signal via its corresponding antenna 452. Each receiver 454 recovers the information modulated onto the RF carrier and converts the RF stream into a baseband multi-carrier symbol stream, which is provided to the receive processor 456. The receive processor 456 and the multi-antenna receive processor 458 implement various L1 signal processing functions. The multi-antenna receive processor 458 performs receive analog precoding / beamforming operations on the baseband multi-carrier symbol stream from the receiver 454. The receive processor 456 converts the baseband multi-carrier symbol stream after the receive analog precoding / beamforming operations from the time domain to the frequency domain using a Fast Fourier Transform (FFT). In the frequency domain, the physical layer data signal and reference signal are demultiplexed by the receive processor 456, where the reference signal is used for channel estimation. The data signal is recovered in the multi-antenna receive processor 458 after multi-antenna detection to any parallel stream destined for the second communication device 450. The symbols on each parallel stream are demodulated and recovered in the receive processor 456, and soft decisions are generated. The receive processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the first communication device 410 on the physical channel. The upper layer data and control signals are then provided to the controller / processor 459. The controller / processor 459 implements L2 functionality. The controller / processor 459 may be associated with a memory 460 that stores program code and data. The memory 460 may be referred to as a computer-readable medium. In the DL, the controller / processor 459 provides demultiplexing between transport and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover upper layer data packets from the core network. The upper layer data packets are then provided to all protocol layers above L2. Various control signals may also be provided to L3 for L3 processing. The controller / processor 459 is also responsible for error detection using an Acknowledgement (ACK) and / or Negative Acknowledgement (NACK) protocol to support HARQ operations.

[0388] During transmission from the second communications device 450 to the first communications device 410, at the second communications device 450, a data source 467 is used to provide upper layer data packets to the controller / processor 459. The data source 467 represents all protocol layers above L2. Similar to the transmit functionality at the first communications device 410 described in the DL, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels based on the radio resource allocation of the first communications device 410, implementing L2 functionality for both the user plane and the control plane. The controller / processor 459 is also responsible for HARQ operations, retransmission of lost packets, and signaling to the first communications device 410. The transmit processor 468 performs modulation mapping and channel coding, while the multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based and non-codebook-based precoding, and beamforming. The transmit processor 468 then modulates the resulting parallel streams into multi-carrier / single-carrier symbol streams. After analog precoding and beamforming operations in the multi-antenna transmit processor 457, these streams are provided to different antennas 452 via the transmitter 454. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a RF symbol stream before providing it to the antenna 452.

[0389] During transmission from the second communication device 450 to the first communication device 410, the functionality at the first communication device 410 is similar to the reception functionality at the second communication device 450 described for transmission from the first communication device 410 to the second communication device 450. Each receiver 418 receives RF signals via its corresponding antenna 420, converts the received RF signals into baseband signals, and provides the baseband signals to the multi-antenna receive processor 472 and the receive processor 470. The receive processor 470 and the multi-antenna receive processor 472 collectively implement L1 functionality. The controller / processor 475 implements L2 functionality. The controller / processor 475 may be associated with a memory 476 storing program code and data. The memory 476 may be referred to as a computer-readable medium. The controller / processor 475 provides demultiplexing between transmit and logical channels, packet reassembly, decryption, header decompression, and control signal processing to recover upper layer data packets from the second communication device 450. The upper layer data packets from the controller / processor 475 may be provided to the core network. The controller / processor 475 is also responsible for error detection using an ACK and / or NACK protocol to support HARQ operations.

[0390] As an embodiment, the second communication device 450 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor. The second communication device 450 device receives at least a first information block, the first information block indicating a first symbol set; selects a target RO from a first RO group and sends a random access preamble in the target RO; the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least some ROs associated with a first SSB index in an SSB-RO mapping cycle, and the at least some ROs depend on whether the first RO group includes ROs in the first symbol set.

[0391] As an embodiment, the second communication device 450 includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates actions when executed by at least one processor, the actions including: receiving a first information block; selecting a target RO from a first RO group, and sending a random access preamble in the target RO.

[0392] As an embodiment, the first communication device 410 includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor. The first communication device 410 device at least sends a first information block, the first information block indicating a first symbol set; receives a random access preamble in a target RO; a receiver of the first information block selects the target RO from a first RO group; the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least some ROs associated with a first SSB index in an SSB-RO mapping cycle, the at least some ROs depending on whether the first RO group includes ROs in the first symbol set.

[0393] As an embodiment, the first communication device 410 includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates actions when executed by at least one processor, and the actions include: sending a first information block; receiving a random access preamble in a target RO.

[0394] As an embodiment, the first node in the present application includes the second communication device 450.

[0395] As an embodiment, the second node in the present application includes the first communication device 410.

[0396] As an embodiment, at least one of {the antenna 420, the transmitter 418, the transmit processor 416, the multi-antenna transmit processor 471, the controller / processor 475, and the memory 476} is used to send a first information block; and at least one of {the antenna 452, the receiver 454, the receive processor 456, the multi-antenna receive processor 458, the controller / processor 459, the memory 460, and the data source 467} is used to receive a first information block.

[0397] As an embodiment, at least one of {the antenna 452, the transmitter 454, the transmit processor 468, the multi-antenna transmit processor 457, the controller / processor 459, the memory 460, and the data source 467} is used to select a target RO from a first RO group and send a random access preamble in the target RO; and at least one of {the antenna 420, the receiver 418, the receive processor 470, the multi-antenna receive processor 472, the controller / processor 475, and the memory 476} is used to receive a random access preamble in the target RO.

[0398] Example 5

[0399] Example 5 illustrates a flow chart of transmission between a first node and a second node according to one embodiment of the present application. In FIG5 , the first node U1 and the second node N2 communicate via a wireless link. The steps in blocks F51, F52, and F53 are optional. It should be noted that the order in this embodiment does not limit the order of signal transmission and implementation in this application.

[0400] For the first node U1, a first information block is received in step S510; a second information block is received in step S5110; a target information block is received in step S5120; a first signaling is received in step S5130; a target RO is selected in the first RO group in step S511, and a random access preamble is sent in the target RO.

[0401] For the second node N2, the first information block is sent in step S520, the second information block is sent in step S5210; the target information block is sent in step S5220; the first signaling is sent in step S5230; and the random access preamble is received in the target RO in step S521.

[0402] In Example 5, the first information block indicates a first symbol set; the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the RO associated with the first SSB index in an SSB-RO mapping loop, and the at least part of the RO depends on whether the first RO group includes the RO in the first symbol set.

[0403] As an embodiment, the first node U1 is the first node in this application.

[0404] As an embodiment, the second node N2 is the second node in this application.

[0405] As an embodiment, the air interface between the second node N2 and the first node U1 includes a wireless interface between a base station device and a user equipment.

[0406] As an embodiment, the air interface between the second node N2 and the first node U1 includes a wireless interface between a relay node device and a user equipment.

[0407] As an embodiment, the air interface between the second node N2 and the first node U1 includes a wireless interface between user equipments.

[0408] As an embodiment, the steps in box F51 in FIG. 5 exist; the method applied to the first node in the present application includes: receiving a second information block.

[0409] As an embodiment, the second information block indicates a first RO set; each RO in the first RO set is mapped to the first SSB index, and at least one RO among the ROs included in the first RO group belongs to the first RO set.

[0410] As an embodiment, the second information block is carried by higher layer signaling.

[0411] As an embodiment, the second information block is carried by RRC signaling.

[0412] As an embodiment, the second information block includes information in at least one RRC IE.

[0413] As an embodiment, the second information block includes part or all of the fields included in an RRC IE.

[0414] As an embodiment, the second information block includes part or all of the fields included in each RRC IE in multiple RRC IEs.

[0415] As an embodiment, the first information block includes part or all of the fields included in a SIB1.

[0416] As an embodiment, the second information block includes part or all of the fields in the RACH-ConfigCommon IE.

[0417] As an embodiment, the second information block includes part or all of the fields in the RACH-ConfigDedicated IE.

[0418] As an embodiment, the second information block includes part or all of the fields in the RACH-ConfigGeneric IE.

[0419] As an embodiment, the second information block includes part or all of the fields in the RACH-ConfigCommonTwoStepRA IE.

[0420] As an embodiment, the second information block includes part or all of the fields in the RACH-ConfigGenericTwoStepRA IE.

[0421] As an embodiment, the second information block indicates the number of ROs included in the first RO set.

[0422] As an embodiment, the second information block indicates time domain information of the RO configured for the first node.

[0423] As an embodiment, the second information block indicates a PRACH configuration index, and the PRACH configuration index indicates time domain information of the RO configured for the first node.

[0424] As a sub-embodiment of this embodiment, the PRACH configuration index indicates a row of the random access configuration table, the row of the random access configuration table indicates the random access preamble format, the PRACH configuration period, the offset of the PRACH configuration period, the subframe number where the RO is located, the number of PRACH time slots included in a subframe, the time division multiplexing number of the RO in a PRACH time slot and the number of symbols occupied by an RO; the PRACH configuration period, the offset of the PRACH configuration period, the subframe number where the RO is located, the number of PRACH time slots included in the subframe and the time division multiplexing number of the RO in the PRACH time slot jointly indicate the time domain information of the RO configured by the first node U1.

[0425] As an embodiment, the second information block indicates frequency domain information of the RO configured for the first node U1.

[0426] As a sub-embodiment of this embodiment, the second information indicates the RO frequency domain starting position, the number of RBs occupied in the frequency domain and the frequency division multiplexing number; the RO frequency domain starting position, the number of RBs occupied in the frequency domain and the frequency division multiplexing number jointly indicate the frequency domain information of the RO configured by the first node.

[0427] As an embodiment, the second information block indicates the number of SSBs to which an RO can be mapped.

[0428] As an embodiment, the time domain information of the RO configured for the first node U1, the frequency domain information of the RO configured for the first node and the number of SSBs to which the one RO can be mapped jointly indicate the ROs in the first RO set.

[0429] As an embodiment, the second information block explicitly indicates the first RO set.

[0430] As an embodiment, the second information block implicitly indicates the first RO set.

[0431] As an embodiment, the second information block configures the first RO set.

[0432] As an embodiment, the second information block indicates time domain resources occupied by any RO in the first RO set.

[0433] As an embodiment, the second information block indicates frequency domain resources occupied by any RO in the first RO set.

[0434] As an embodiment, the second information block indicates code domain resources occupied by any RO in the first RO set.

[0435] As a sub-embodiment of this embodiment, the code domain resources include a preamble.

[0436] As a sub-embodiment of this embodiment, the code domain resources include orthogonal sequences.

[0437] As an embodiment, the step in block F51 in FIG. 5 does not exist.

[0438] As an embodiment, the step in box F52 in FIG. 5 exists; the method applied to the first node in the present application includes: receiving a target information block.

[0439] As an embodiment, the target information block indicates whether the first symbol set is used for random access; when the first symbol set is used for random access, the first RO group includes the ROs in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the ROs in the first symbol set.

[0440] As an embodiment, the target information block is carried by higher layer signaling.

[0441] As an embodiment, the target information block is carried by RRC signaling.

[0442] As an embodiment, the target information block includes information in at least one RRC IE.

[0443] As an embodiment, the target information block includes part or all of the fields included in an RRC IE.

[0444] As an embodiment, the target information block includes part or all of the fields included in each of the multiple RRC IEs.

[0445] As an embodiment, the target information block includes part or all of the fields included in a SIB1.

[0446] As an embodiment, the name of the RRC signaling carrying the target information block includes "SIB".

[0447] As an embodiment, the name of the RRC signaling carrying the target information block includes "SBFD".

[0448] As an embodiment, the name of the RRC signaling carrying the target information block includes "Config".

[0449] As an embodiment, the name of the RRC signaling carrying the target information block includes "RACH".

[0450] As an embodiment, the name of the RRC signaling carrying the target information block includes "RA".

[0451] As an embodiment, the name of the RRC signaling carrying the target information block includes "Generic".

[0452] As an embodiment, the name of the RRC signaling carrying the target information block includes "Common".

[0453] As an embodiment, the name of the RRC signaling carrying the target information block includes "Dedicated".

[0454] As an embodiment, the name of the RRC signaling carrying the target information block includes "TwoStep".

[0455] As an embodiment, the receiver of the target information block does not include legacy UE.

[0456] As an embodiment, the target information block is unavailable to legacy UEs.

[0457] As an embodiment, the target information block implicitly indicates whether the first symbol set is used for random access.

[0458] As an embodiment, the target information block explicitly indicates whether the first symbol set is used for random access.

[0459] As an embodiment, the target information block is configured as an RO in the first symbol set.

[0460] As an embodiment, the target information block is only configured in the RO in the first symbol set.

[0461] As an embodiment, the target information block indicates that the RO in the first symbol set can be used to send a random access preamble.

[0462] As an embodiment, the target information block indicates that the RO in the first symbol set cannot be used to send a random access preamble.

[0463] As an embodiment, the target information block indicates that the RO in the first symbol set can be used to send a random access preamble when a given condition is met.

[0464] As a sub-embodiment of this embodiment, the given conditions include: maximum transmission power.

[0465] As a sub-embodiment of this embodiment, the given conditions include: priority rules.

[0466] As a sub-embodiment of this embodiment, the given conditions include: UE processing time requirements.

[0467] As a sub-embodiment of this embodiment, the advantage of the above method is that the first node U1 can determine whether the RO in the first symbol set can be used to send a random access preamble based on actual conditions, can be flexibly applied to different environments, and better handle cross-link interference.

[0468] As an embodiment, the target information block is used to determine the RO associated with the first SSB index in the non-legacy SSB-RO mapping loop in this application.

[0469] As an embodiment, the target information block is used to indicate the RO associated with the first SSB index in the non-legacy SSB-RO mapping cycle in this application.

[0470] As an embodiment, the target information block is used to indicate the RO associated with all SSB indexes in the non-legacy SSB-RO mapping loop in this application.

[0471] As a sub-embodiment of this embodiment, when the first symbol set is used for random access, the RO in the first symbol set included in the first RO group belongs to the RO associated with the first SSB index in the non-legacy SSB-RO mapping loop in this application.

[0472] As an embodiment, the non-legacy SSB-RO mapping cycle is an SSB-RO mapping cycle for Rel-18.

[0473] As an embodiment, the non-legacy SSB-RO mapping cycle is an SSB-RO mapping cycle for Rel-18 and later versions.

[0474] As an embodiment, the non-legacy SSB-RO mapping cycle is an SSB-RO mapping cycle for Rel-19 and later versions.

[0475] As an embodiment, the non-legacy SSB-RO mapping cycle is invisible to Rel-11 and earlier versions.

[0476] As an embodiment, the non-legacy SSB-RO mapping cycle is not available for Rel-11 and earlier versions.

[0477] As an embodiment, the step in block F52 in FIG. 5 does not exist.

[0478] As a sub-embodiment of this embodiment, whether the first symbol set is used for random access is a default.

[0479] As a sub-embodiment of this embodiment, whether the first symbol set is used for random access is predefined.

[0480] As a sub-embodiment of this embodiment, whether the first symbol set is used for random access is implementation-dependent.

[0481] As an embodiment, the steps in box F53 in FIG. 5 exist; the method applied to the first node in the present application includes: receiving first signaling.

[0482] As an embodiment, the first signaling indicates a first PRACH mask index value, and among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

[0483] As an embodiment, the PRACH mask index value refers to: PRACH mask index value.

[0484] As an embodiment, the first signaling is higher layer signaling.

[0485] As an embodiment, the first signaling is RRC layer signaling.

[0486] As an embodiment, the first signaling includes at least one RRC IE.

[0487] As an embodiment, the first signaling includes part or all of the fields included in an RRC IE.

[0488] As an embodiment, the first signaling includes part or all of the fields included in each RRC IE in multiple RRC IEs.

[0489] As an embodiment, the first signaling includes part or all of the fields included in a ReconfigurationWithSync IE.

[0490] As an embodiment, the first signaling includes part or all of the fields in the RACH-ConfigDedicatedIE.

[0491] As an embodiment, the first signaling includes part or all of the fields in the CFRA IE.

[0492] As an embodiment, the first signaling includes part or all of the fields in the CFRA-TwoStep IE.

[0493] As an embodiment, the first signaling includes part or all of the fields in the SI-RequestConfig IE.

[0494] As an embodiment, the first signaling includes part or all of the fields in the SI-RequestResources IE.

[0495] As an embodiment, the first signaling includes the ra-ssb-OccasionMaskIndex field.

[0496] As an embodiment, the first signaling is layer 1 (Layer 1, L1) signaling.

[0497] As an embodiment, the first signaling is physical layer signaling.

[0498] As an embodiment, the first signaling is a PDCCH (Physical Downlink Control CHannel) order.

[0499] As an embodiment, the first signaling is an enhanced PDCCH order.

[0500] As an embodiment, the first signaling includes a DCI and one or more fields.

[0501] As an embodiment, the first signaling is DCI, and the format of the DCI is DCI format 0_1.

[0502] As an embodiment, the first signaling is DCI, the DCI includes a Random Access Preamble index field, and the Random Access Preamble index field included in the DCI is not zero.

[0503] As an embodiment, the first signaling is DCI, the DCI includes a Frequency domain resource assignment field, and the Frequency domain resource assignment field included in the DCI is set to all 1s.

[0504] As an embodiment, the first signaling triggers the first node U1 to send the random access preamble in the target RO.

[0505] As an embodiment, the first signaling indicates the first PRACH mask index value.

[0506] As an embodiment, the first signaling is RRC signaling, the RRC signaling includes a ra-ssb-OccasionMaskIndex field, and the ra-ssb-OccasionMaskIndex field included in the RRC signaling indicates the first PRACH mask index value.

[0507] As an embodiment, the first signaling is DCI, the DCI includes a PRACH mask index field (Field), and the PRACH mask index field included in the DCI indicates the first PRACH mask index value.

[0508] As an embodiment, the first signaling indicates the first SSB index.

[0509] As an embodiment, the first signaling is RRC signaling, the RRC signaling includes the ssb field in the CFRA-SSB-Resource IE, and the ssb field in the CFRA-SSB-Resource IE included in the RRC signaling indicates the first SSB index.

[0510] As an embodiment, the first signaling is DCI, the DCI includes an SS / PBCH index field, and the SS / PBCH index field included in the DCI indicates the first SSB index.

[0511] As an embodiment, the first signaling indicates the index value of the random access preamble in the target RO.

[0512] As an embodiment, the first signaling is RRC signaling, the RRC signaling includes the ra-PreambleIndex field in the CFRA-SSB-Resource IE, and the ra-PreambleIndex field in the CFRA-SSB-Resource IE included in the RRC signaling indicates the index value of the random access preamble sent in the target RO.

[0513] As an embodiment, the first signaling is DCI, the DCI includes a Random Access Preamble index field, and the Random Access Preamble index field included in the DCI indicates an index value of the random access preamble sent in the target RO.

[0514] As an embodiment, the first signaling is DCI, and the one SSB-RO mapping cycle mentioned in this application refers to the first available SSB-RO mapping cycle after the first node U1 decodes the first signaling.

[0515] As an embodiment, the step in block F53 in FIG. 5 does not exist.

[0516] As a sub-embodiment of this embodiment, the sending of the random access preamble by the first node U1 in the target RO is triggered by the RRC layer or the MAC entity.

[0517] As a sub-embodiment of this embodiment, the sending of the random access preamble by the first node U1 in the target RO is not triggered by a PDCCH order.

[0518] As a sub-embodiment of this embodiment, the random access preamble sent by the first node U1 in the target RO is a random access preamble for CBRA.

[0519] As an embodiment, the blocks F51, F52 and F53 in FIG. 5 do not exist, the step S510 is before the step S511, and the step S520 is before the step S521.

[0520] As an embodiment, the steps in box F51 in FIG. 5 exist, step S5210 is before step S521 , and step S5110 is before step S511 .

[0521] As a sub-embodiment of this embodiment, step S5210 is before step S520, and step S5110 is before step S510.

[0522] As a sub-embodiment of this embodiment, step S5210 is after step S520, and step S5110 is after step S510.

[0523] As a sub-embodiment of this embodiment, the first information block and the second information block both include RRC signaling, the first information block and the second information block include different fields of the same RRC IE, the step S5210 and the step S520 occur simultaneously, and the step S5110 and the step S510 occur simultaneously.

[0524] As an embodiment, the steps in box F52 in FIG. 5 exist, the step S5220 is before the step S521 , and the step S5120 is before the step S511 .

[0525] As a sub-embodiment of this embodiment, step S5220 is before step S520, and step S5120 is before step S510.

[0526] As a sub-embodiment of this embodiment, step S5220 is after step S520, and step S5120 is after step S510.

[0527] As a sub-embodiment of this embodiment, the first information block and the target information block both include RRC signaling, the first information block and the target information block include different fields of the same RRC IE, the step S5220 and the step S520 occur simultaneously, and the step S5120 and the step S510 occur simultaneously.

[0528] As an embodiment, the steps in box F53 in FIG. 5 exist, the step S5230 is before the step S521 , and the step S5130 is before the step S511 .

[0529] As a sub-embodiment of this embodiment, step S5230 is before step S520, and step S5130 is before step S510.

[0530] As a sub-embodiment of this embodiment, step S5230 is after step S520, and step S5130 is after step S510.

[0531] As a sub-embodiment of this embodiment, the first information block and the first signaling both include RRC signaling, the first information block and the first signaling include different fields of the same RRC IE, the step S5230 and the step S520 occur simultaneously, and the step S5130 and the step S510 occur simultaneously.

[0532] As an embodiment, the steps in box F51 and box F52 in FIG. 5 exist simultaneously, and both step S5210 and step S5220 are before step S521; and both step S5110 and step S5120 are before step S511.

[0533] As an embodiment, the steps in box F51 and box F53 in FIG. 5 exist simultaneously, and both step S5210 and step S5230 are before step S521; and both step S5110 and step S5130 are before step S511.

[0534] As an embodiment, the steps in box F52 and box F53 in FIG. 5 exist simultaneously, and both step S5220 and step S5230 are before step S521; and both step S5120 and step S5130 are before step S511.

[0535] As an embodiment, the steps in box F52, box F52 and box F53 in Figure 5 exist at the same time, and the step S5210, the step S5220 and the step S5230 are all before the step S521; the step S5110, the step S5120 and the step S5130 are all before the step S511.

[0536] As an embodiment, the first information block is transmitted on a downlink physical control channel (ie, a downlink channel that can only be used to carry physical layer control signaling).

[0537] As an embodiment, the physical layer channel occupied by the first information block includes PDCCH.

[0538] As an embodiment, the first information block is transmitted on a downlink physical data channel (ie, a downlink channel that can be used to carry physical layer data).

[0539] As an embodiment, the physical layer channel occupied by the first information block includes PDSCH.

[0540] As an embodiment, the transmission channel occupied by the first information block includes DL-SCH (DownLink-Shared CHannel).

[0541] As an embodiment, the second information block is transmitted on a downlink physical data channel (ie, a downlink channel that can be used to carry physical layer data).

[0542] As an embodiment, the physical layer channel occupied by the second information block includes PDSCH.

[0543] As an embodiment, the transmission channel occupied by the second information block includes DL-SCH.

[0544] As an embodiment, the target information block is transmitted on a downlink physical data channel (ie, a downlink channel that can be used to carry physical layer data).

[0545] As an embodiment, the physical layer channel occupied by the target information block includes PDSCH.

[0546] As an embodiment, the transmission channel occupied by the target information block includes DL-SCH.

[0547] As an embodiment, the first signaling is transmitted on a downlink physical control channel (ie, a downlink channel that can only be used to carry physical layer control signaling).

[0548] As an embodiment, the physical layer channel occupied by the first signaling includes PDCCH.

[0549] As an embodiment, the first signaling is transmitted on a downlink physical data channel (ie, a downlink channel that can be used to carry physical layer data).

[0550] As an embodiment, the physical layer channel occupied by the first signaling includes PDSCH.

[0551] As an embodiment, the physical layer channel occupied by the random access preamble sent in the target RO includes PRACH.

[0552] Example 6

[0553] Example 6 illustrates a schematic diagram of the relationship between ROs in a first RO set and a first SSB index according to an embodiment of the present application, as shown in Figure 6. In Figure 6, the second information block indicates the first RO set; each RO in the first RO set is mapped to the first SSB index; the ROs included in the first RO set are represented as: RO#1, ..., RO#n, ..., RO#N; where N is a positive integer greater than 1.

[0554] In embodiment 6, at least one RO among the ROs included in the first RO group belongs to the first RO set.

[0555] As an embodiment, the first RO set includes a positive integer number of ROs greater than 1.

[0556] As an embodiment, the feature “each RO in the first RO set is mapped to a first SSB index” means that each RO in the first RO set is associated with the first SSB index.

[0557] As an embodiment, the feature “each RO in the first RO set is mapped to a first SSB index” means that each RO in the first RO set is associated only with the first SSB index.

[0558] As an embodiment, the feature “each RO in the first RO set is mapped to a first SSB index” means that each RO in the first RO set corresponds to the first SSB index.

[0559] As an embodiment, the feature “each RO in the first RO set is mapped to the first SSB index” means that each RO in the first RO set corresponds only to the first SSB index.

[0560] As an embodiment, the feature “each RO in the first RO set is mapped to a first SSB index” means that each RO in the first RO set is mapped to the first SSB index.

[0561] As an embodiment, the feature “each RO in the first RO set is mapped to the first SSB index” means that each RO in the first RO set is only mapped to the first SSB index.

[0562] As an embodiment, the feature “each RO in the first RO set is mapped to a first SSB index” means that each RO in the first RO set can be used to send a preamble associated with the first SSB index.

[0563] As an embodiment, the feature “each RO in the first RO set is mapped to a first SSB index” means that each RO in the first RO set can only be used to send a preamble associated with the first SSB index.

[0564] As an embodiment, the feature “each RO in the first RO set is mapped to a first SSB index” means that the first SSB index is mapped to each RO in the first RO set.

[0565] As an embodiment, any RO among the ROs included in the first RO group belongs to the first RO set.

[0566] As an embodiment, the first RO group is a subset of the first RO set.

[0567] As an embodiment, the first RO group is a proper subset of the first RO set.

[0568] As an embodiment, the first RO set corresponds to the RO mapped to the first SSB index in an association period described in this application, and the first RO group belongs to the RO in an SSB-RO mapping cycle included in the association period.

[0569] As an embodiment, the first RO set corresponds to the ROs mapped to the first SSB index in an association pattern period, and the ROs included in the first RO group belong to the ROs in an association period included in the association pattern period.

[0570] As an embodiment, the first RO set corresponds to the RO mapped to the first SSB index in an associated pattern period, and the ROs included in the first RO group belong to the RO associated to the SSB index in an associated period included in the associated pattern period.

[0571] As an embodiment, the first RO set corresponds to the RO mapped to the first SSB index in an associated pattern period, and the ROs included in the first RO group belong to the RO associated to the first SSB index in an SSB-RO mapping cycle included in the associated pattern period.

[0572] As an embodiment, the period of an association pattern described in this application does not exceed 160ms.

[0573] As an embodiment, an associated pattern period described in the present application includes at least one associated period described in the present application.

[0574] As an embodiment, an associated pattern period described in the present application refers to a time domain repetition period of an associated period in which an SSB index is mapped to an RO.

[0575] Example 7

[0576] Embodiment 7 illustrates a schematic diagram of the relationship between a first symbol set and a first RO group according to an embodiment of the present application, as shown in FIG7. In FIG7, case (a) indicates that when the first symbol set is used for random access, the first RO group includes ROs in the first symbol set; case (b) indicates that when the first symbol set is not used for random access, the first RO group does not include ROs in the first symbol set.

[0577] As an embodiment, the feature "the first symbol set is used for random access" means that RO is configured on the symbols included in the first symbol set.

[0578] As an embodiment, the feature "the first symbol set is used for random access" means that the RO configured on the symbols included in the first symbol set is a valid RO.

[0579] As an embodiment, the feature "the first symbol set is used for random access" means that when the time domain resources occupied by the RO configured for the first node overlap with the first symbol set, the RO configured for the first node is a valid RO.

[0580] As an embodiment, the feature "the first symbol set is used for random access" means that the RO on the first symbol set can be mapped to an SSB index in an SSB-RO cyclic mapping.

[0581] As an embodiment, the feature "the first symbol set is not used for random access" means that RO is not configured on the symbols included in the first symbol set.

[0582] As an embodiment, the feature “the first symbol set is not used for random access” means that the RO configured on the symbols included in the first symbol set is not a valid RO.

[0583] As an embodiment, the feature "the first symbol set is not used for random access" means that when the time domain resources occupied by the RO configured for the first node overlap with the first symbol set, the RO configured for the first node is not a valid RO.

[0584] As an embodiment, the feature "the first symbol set is not used for random access" means that the RO on the first symbol set cannot be mapped to an SSB index in an SSB-RO cyclic mapping.

[0585] As an embodiment, when the first symbol set is used for random access, the first RO group includes the ROs in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the ROs in the first symbol set.

[0586] As an embodiment, when the first symbol set is used for random access, the first RO group includes ROs in the first symbol set and ROs outside the first symbol set; when the first symbol set is not used for random access, the first RO group only includes ROs outside the first symbol set.

[0587] As a sub-embodiment of this embodiment, the RO in the first symbol set is mapped to the first SSB index.

[0588] Example 8

[0589] Embodiment 8 illustrates a schematic diagram of the relationship between the first PRACH mask index value and the first RO group according to an embodiment of the present application, as shown in FIG8. In FIG8, the first signaling indicates the first PRACH mask index value; among the ROs associated with the first SSB index in an SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group, and the ROs associated with the first SSB index in the SSB-RO mapping cycle are represented as RO#1, ..., RO#m, ..., RO#M, where M is a positive integer greater than 1.

[0590] As an embodiment, the first signaling indicates a first PRACH mask index value; among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

[0591] As an embodiment, the first PRACH mask index value indicates at least one RO.

[0592] As an embodiment, the first PRACH mask index value indicates at least one RO.

[0593] As an embodiment, the first PRACH mask index value indicates all ROs in the RO associated with the first SSB index in the one SSB-RO mapping cycle.

[0594] As an embodiment, the first PRACH mask index value indicates a portion of the ROs in the RO associated with the first SSB index in the one SSB-RO mapping cycle.

[0595] As an embodiment, the first SSB index is associated with L1 RO groups, the ROs in any RO group in the L1 RO groups are sorted, and the first RO group includes the ROs in any RO group in the L1 RO groups indicated by the first PRACH mask index value.

[0596] As a sub-embodiment of this embodiment, L1 is equal to 1.

[0597] As a sub-embodiment of this embodiment, L1 is greater than 1.

[0598] As a sub-embodiment of this embodiment, there are two RO groups in the L1 RO groups, and the ROs included in the two groups are overlapping.

[0599] As a sub-embodiment of this embodiment, there are two RO groups in the L1 RO groups, and the ROs included in the two groups are orthogonal.

[0600] As a sub-embodiment of this embodiment, there are two RO groups in the L1 RO groups that include the same number of ROs.

[0601] As a sub-embodiment of this embodiment, there are two RO groups in the L1 RO groups, and the numbers of ROs included are different.

[0602] As a sub-embodiment of this embodiment, the number of ROs included in any RO group of the L1 RO groups is not greater than 8.

[0603] As a sub-embodiment of this embodiment, the first mask index value indicates one RO group among L1 RO groups.

[0604] As a sub-embodiment of this embodiment, all ROs included in the L1 RO groups belong to the RO associated with the first SSB index in the one SSB-RO mapping cycle.

[0605] As a sub-embodiment of this embodiment, all ROs included in the L1 RO groups belong to ROs associated with the first SSB index in one association cycle.

[0606] As an embodiment, the ROs associated with the first SSB index in the SSB-RO mapping loop are M ROs, where M is a positive integer greater than 1, and the M ROs are indexed in a given order. The RO whose remainder obtained by taking the modulus of the given integer among the M ROs corresponds to the first PRACH mask index value and belongs to the first RO group.

[0607] As a sub-embodiment of this embodiment, the given integer is fixed, or the given integer is configured through high-layer signaling.

[0608] As a sub-embodiment of this embodiment, the given integer depends on the association period in this application.

[0609] As a sub-embodiment of this embodiment, the given integer is equal to the Y1 in Example 9 of the present application.

[0610] As a sub-embodiment of this embodiment, the given integer is equal to the W1 in Example 9 of the present application.

[0611] As a sub-embodiment of this embodiment, the given sequential index is indexed in ascending order of frequency domain resources first and then in ascending order of time domain resources.

[0612] As a sub-embodiment of this embodiment, the given sequential index is indexed in ascending order of time domain resources first and then in ascending order of frequency domain resources.

[0613] Example 9

[0614] Embodiment 9 illustrates a schematic diagram illustrating the relationship between the number of ROs included in at least some ROs and the number of ROs included in the first RO group according to an embodiment of the present application, as shown in FIG9 . In FIG9 , the more ROs included in the first symbol set in the first RO group, the fewer ROs included in the at least some ROs.

[0615] As an embodiment, the more ROs included in the first symbol set are included in the first RO group, the fewer ROs included in the at least part of the ROs.

[0616] As an embodiment, the number of ROs included in the first RO group is equal to Y1, and Y1 is a positive integer greater than 1.

[0617] As a sub-embodiment of this embodiment, Y1 is fixed, or Y1 is configured through high-layer signaling.

[0618] As a sub-embodiment of this embodiment, the Y1 depends on the one association cycle in this application.

[0619] As a sub-embodiment of this embodiment, the Y1 is the number of all ROs associated with the first SSB index in one SSB-RO mapping cycle when the first RO group does not include ROs in the first symbol set.

[0620] As a sub-embodiment of this embodiment, the number of ROs included in the first symbol set and the number of ROs included in the at least part of the ROs are equal to Y1.

[0621] As an embodiment, the number of ROs included in the first symbol set in the first RO group is equal to Y2, and Y2 is a positive integer greater than 1; the number of ROs included in the at least part of the ROs depends on Y2.

[0622] As a sub-embodiment of this embodiment, the number of ROs included in the at least part of the ROs is equal to the difference between the first integer and Y2 multiplied by 2, and the first integer is an integer greater than Y2.

[0623] As a sub-embodiment of this embodiment, the number of ROs included in the at least part of the ROs is equal to the difference between the first integer and the product of 0.5 and Y2, where Y2 is an even number greater than 1, and the first integer is an integer greater than the product of 0.5 and Y2.

[0624] As a sub-embodiment of this embodiment, the first integer is predefined, or the first integer is configured through high-layer signaling.

[0625] As a sub-embodiment of this embodiment, the first integer depends on the one association period in this application.

[0626] Example 10

[0627] Embodiment 10 illustrates a schematic diagram of the relationship between at least some ROs and whether the first RO group includes ROs in the first symbol set according to an embodiment of the present application, as shown in Figure 10. In Figure 10, case (a) indicates that when the first RO group does not include ROs in the first symbol set, the first RO group includes all ROs associated with the first SSB index in one SSB-RO mapping cycle; case (b) indicates that when the first RO group includes ROs in the first symbol set, the first RO group includes some ROs associated with the first SSB index in one SSB-RO mapping cycle.

[0628] As an embodiment, when the first RO group does not include the RO in the first symbol set, the first RO group includes all ROs associated with the first SSB index in an SSB-RO mapping cycle; when the first RO group includes the RO in the first symbol set, the first RO group includes some ROs associated with the first SSB index in an SSB-RO mapping cycle, and ROs in a target RO set, wherein the target RO set is RO other than all ROs associated with the first SSB index in an SSB-RO mapping cycle.

[0629] As a sub-embodiment of this embodiment, the ROs in the target RO set are associated with the first SSB index.

[0630] As a sub-embodiment of this embodiment, the number of all ROs associated with the first SSB index in the one SSB-RO mapping loop is equal to W1, the number of partial ROs associated with the first SSB index in the one SSB-RO mapping loop included in the first RO group is equal to W2, the number of ROs in the target RO set is equal to W3, the W1 is a positive integer greater than 1, the W2 is a positive integer, the W3 is a positive integer, and the W1 is equal to the sum of the W2 and the W3.

[0631] As a subsidiary embodiment of this sub-embodiment, W1 is predefined.

[0632] As a subsidiary embodiment of this sub-embodiment, the W1 is indicated through RRC signaling.

[0633] As an embodiment, when the first RO group includes ROs in the first symbol set, the first RO group includes some ROs associated with the first SSB index in an SSB-RO mapping cycle, and ROs in a target RO set, which is ROs other than all ROs associated with the first SSB index in the one SSB-RO mapping cycle.

[0634] As a sub-embodiment of this embodiment, the first RO group includes the partial ROs associated with the first SSB index in an SSB-RO mapping cycle, the number of which is equal to W2, and the number of ROs in the target RO set is equal to W3; the partial ROs are the W2 ROs with the smallest number sorted by RO index among all ROs associated with the first SSB index in the SSB-RO mapping cycle; the ROs in the target RO set are the W3 ROs with the smallest number sorted by RO index among all ROs associated with the first SSB index, located in the SSB-RO mapping cycle, and occupying the first symbol set; the W2 is a positive integer, and the W3 is a positive integer.

[0635] As an embodiment, the ROs included in the target RO set in the present application are located in a time window corresponding to the one SSB-RO mapping cycle.

[0636] As an embodiment, the ROs included in the target RO set in the present application do not belong to the RO associated with the first SSB index in the one SSB-RO mapping cycle.

[0637] As an embodiment, the ROs included in the target RO set in the present application belong to the RO associated with the first SSB index in a non-legacy SSB-RO mapping cycle.

[0638] Example 11

[0639] Example 11 illustrates a schematic diagram of how a first node selects a target RO according to an embodiment of the present application, as shown in Figure 11. In Figure 11, case (a) indicates that when the first RO group does not include ROs in the first symbol set, the first node selects the target RO from the first RO group with equal probability; case (b) indicates that when the first RO group includes ROs in the first symbol set, the first node preferentially selects the target RO from K1 ROs in the first RO group, where the K1 ROs do not include ROs in the first symbol set.

[0640] As an embodiment, when the first RO group does not include the RO in the first symbol set, the first node selects the target RO from the first RO group with equal probability; when the first RO group includes the RO in the first symbol set, the first node preferentially selects the target RO from K1 ROs in the first RO group, and the K1 ROs do not include the RO in the first symbol set.

[0641] As an embodiment, the feature “the first node selects the target RO from the first RO group with equal probability” means that the first RO group includes W1 ROs, the probability of the first node selecting any one of the W1 ROs as the target RO is the same, and W1 is a positive integer.

[0642] As an embodiment, the feature "the first node selects the target RO from the first RO group with equal probability" means that the first RO group includes W1 ROs, and the probability of the first node selecting any one of the W1 ROs as the target RO is equal to the quotient obtained by dividing 1 by W1, where W1 is a positive integer.

[0643] As an embodiment, the feature "the first node preferentially selects the target RO from the K1 ROs in the first RO group" means that the first node selects the target RO from the K1 ROs with equal probability according to a first probability, and from ROs other than the K1 ROs in the first RO group with equal probability according to a second probability, the first probability is greater than the second probability, and the first probability and the second probability are both fractions less than 1.

[0644] As a sub-embodiment of this embodiment, the number of ROs other than the K1 ROs in the first RO group is equal to K2, where K2 is a positive integer greater than 1, and the product of the first probability multiplied by K1 plus the product of the second probability multiplied by K2 is equal to 1.

[0645] As an embodiment, the feature "the first node preferentially selects the target RO from the K1 ROs of the first RO group" means that: when the length of the first time window is less than the first time threshold, the first node selects the target RO from the ROs in the first time window with equal probability, and the first node does not select the RO in the first time window that includes the first symbol set, the first time threshold is fixed, or the first time threshold is configured through high-layer signaling, the K1 ROs are located in the first time window, and the first time window starts at the first RO in the first RO group in the time domain.

[0646] Example 12

[0647] Embodiment 12 illustrates a schematic diagram of ROs included in a first RO group according to an embodiment of the present application, as shown in FIG12. In FIG12, an unfilled rectangle represents an RO in a first symbol set, and a box filled with an upward slash represents an RO associated with the first SSB index in an SSB-RO mapping cycle.

[0648] In Example 12, case (a) indicates that when the first RO group does not include ROs in the first symbol set, the first RO group only includes all ROs associated with the first SSB index in one SSB-RO mapping cycle; case (b) indicates that when the first RO group includes ROs in the first symbol set, the first RO group includes some ROs associated with the first SSB index in one SSB-RO mapping cycle and some ROs in the first symbol set; and the number of ROs included in the first RO group in case (a) and case (b) is the same.

[0649] As an embodiment, the ROs included in the first RO group occupy discontinuous time domain resources.

[0650] As an embodiment, there are two ROs in the first RO group occupying continuous time domain resources.

[0651] As an embodiment, when the first RO group does not include the RO in the first symbol set, the ROs included in the first RO group are periodic in the time domain.

[0652] As an embodiment, when the first RO group does not include the RO in the first symbol set, the ROs included in the first RO group are non-periodic in the time domain.

[0653] As an embodiment, when the first RO group includes ROs in the first symbol set, the ROs included in the first RO group are periodic in the time domain.

[0654] As an embodiment, when the first RO group includes ROs in the first symbol set, the ROs included in the first RO group are non-periodic in the time domain.

[0655] As an embodiment, the first RO group includes some ROs in the first symbol set and the at least some ROs forming the first RO group.

[0656] As an embodiment, the first SSB index is sequentially mapped to N consecutive valid ROs in a given order, and the first RO group includes the N valid ROs, where N is a positive integer.

[0657] As a sub-embodiment of this embodiment, the ROs in the first symbol set are considered to be valid ROs, and when the N valid ROs include the ROs in the first symbol set, the first RO includes the ROs in the first symbol set.

[0658] As a sub-embodiment of this embodiment, when the RO in the first symbol set is not considered as a valid RO, or when the N valid ROs do not include the RO in the first symbol set, the first RO does not include the RO in the first symbol set.

[0659] As a sub-embodiment of this embodiment, the given sequential index is indexed in ascending order of frequency domain resources first and then in ascending order of time domain resources.

[0660] As a sub-embodiment of this embodiment, the given sequential index is indexed in ascending order of time domain resources first and then in ascending order of frequency domain resources.

[0661] As an embodiment, when the first RO group includes ROs in the first symbol set, the first RO group includes some ROs associated with the first SSB index in an SSB-RO mapping cycle and ROs in the first symbol set located in a given time window.

[0662] As a sub-embodiment of this embodiment, the given time window is the duration of the one SSB-RO mapping cycle.

[0663] As a sub-embodiment of this embodiment, the given time window is the duration of an associated period.

[0664] As a sub-embodiment of this embodiment, the given time window is less than the duration of the first SSB-RO mapping cycle.

[0665] As a sub-embodiment of this embodiment, the given time window is less than the duration of an association cycle.

[0666] Example 13

[0667] Embodiment 13 illustrates a schematic diagram of symbols in a first symbol set according to an embodiment of the present application, as shown in FIG13. In FIG13, the horizontal axis represents time and the vertical axis represents frequency; the area filled with vertical lines represents the time domain resources occupied by downlink symbols in time, the area filled with horizontal lines represents the time domain resources occupied by uplink symbols in time, the unfilled area represents the time domain resources occupied by flexible symbols in time, and the area filled with solid gray represents the first subband. The area occupied by the first subband represents the frequency domain resources that can be used for uplink transmission in downlink symbols and flexible symbols in frequency.

[0668] In embodiment 13, the first type of symbols includes symbols configured as downlink symbols by TDD uplink and downlink configuration signaling and used for uplink transmission, and the first symbol set includes the first type of symbols.

[0669] As an embodiment, the first category of symbols also includes symbols configured as flexible symbols by TDD uplink and downlink configuration signaling and used for uplink transmission.

[0670] As an embodiment, in the present application, the meaning that a symbol is configured as a downlink symbol includes: the type of the symbol is DL.

[0671] As an embodiment, in the present application, the meaning that a symbol is configured as an uplink symbol includes: the type of the symbol is UL.

[0672] As an embodiment, in the present application, a symbol being configured as a flexible symbol means that the type of the symbol is F (flexible).

[0673] As an embodiment, the first subband occupies at least one RB (Resource Block) set in the frequency domain.

[0674] As a sub-embodiment of this embodiment, the RB set is a group of continuous RBs.

[0675] As a sub-embodiment of this embodiment, the RB set is configured by a higher layer parameter "IntraCellGuardBandsPerSCS".

[0676] As a sub-embodiment of this embodiment, the RB set is configured by a higher layer parameter "intraCellGuardBandsUL-List".

[0677] As a sub-embodiment of this embodiment, a guard band exists between two adjacent RB sets.

[0678] As an embodiment, there are guard bands on both sides of the first sub-band in the frequency domain.

[0679] As an embodiment, a guard band exists on one side of the first sub-band in the frequency domain.

[0680] As an embodiment, there are no guard bands on both sides of the first sub-band in the frequency domain.

[0681] As a sub-embodiment of the above three embodiments, the guard band is not used for uplink transmission or downlink transmission.

[0682] As an embodiment, the first subband occupies at least one RB in the frequency domain.

[0683] As a sub-embodiment of this embodiment, the at least one RB includes one RB.

[0684] As a sub-embodiment of this embodiment, the at least one RB includes multiple consecutive RBs.

[0685] As an embodiment, the RB in the present application includes a PRB (Physical Resource Block).

[0686] As an embodiment, the RB in this application refers to PRB.

[0687] Typically, one RB occupies 12 consecutive subcarriers in the frequency domain.

[0688] As an embodiment, the first subband occupies multiple subcarriers in the frequency domain.

[0689] As an embodiment, the first subband belongs to a UL carrier.

[0690] As an embodiment, the frequency domain resources occupied by the first subband belong to a UL carrier.

[0691] As an embodiment, the UL carrier described in this application includes a normal uplink (Normal UL, NUL) carrier.

[0692] As an embodiment, the UL carrier described in this application includes a supplementary uplink (Supplementary UL, SUL) carrier.

[0693] As an embodiment, the first subband belongs to a DL carrier.

[0694] As an embodiment, the frequency domain resources occupied by the first subband belong to a DL carrier.

[0695] As an embodiment, the first sub-band belongs to a BWP.

[0696] As an embodiment, the first subband belongs to a UL BWP.

[0697] As an embodiment, the frequency domain resources occupied by the first subband belong to a UL BWP.

[0698] As an embodiment, the first subband belongs to a DL BWP.

[0699] As an embodiment, the frequency domain resources occupied by the first subband belong to a DL BWP.

[0700] As an embodiment, there are overlapping frequency domain resources between the first subband and a UL BWP.

[0701] As an embodiment, there are no overlapping frequency domain resources between the first subband and a UL BWP.

[0702] As an embodiment, the first sub-band includes a SBFD (SubBand non-overlapping Full Duplex) sub-band.

[0703] As an embodiment, the first sub-band is an SBFD sub-band.

[0704] As an embodiment, the one SBFD subband described in this application is used for uplink transmission.

[0705] As an embodiment, the one SBFD sub-band described in the present application can (or may or is allowed to) be used for uplink transmission.

[0706] As an embodiment, the one SBFD subband described in this application is a UL subband.

[0707] As an embodiment, the first symbol set includes a positive integer number of symbols greater than 1.

[0708] As an embodiment, the first symbol set includes the first category of symbols.

[0709] As an embodiment, the first symbol set only includes the first category of symbols.

[0710] As an embodiment, the first symbol set includes full-duplex symbols.

[0711] As an embodiment, the first symbol set includes SBFD symbols.

[0712] As an embodiment, the symbols in the first symbol set are configured for SBFD.

[0713] As an embodiment, the first symbol set includes downlink symbols used for uplink transmission indicated by the TDD uplink and downlink configuration signaling.

[0714] As an embodiment, the first symbol set includes flexible symbols used for uplink transmission indicated by the TDD uplink and downlink configuration signaling.

[0715] As an embodiment, the symbols in the first symbol set are all downlink symbols used for uplink transmission indicated by TDD uplink and downlink configuration signaling.

[0716] As an embodiment, any symbol in the first symbol set is a downlink symbol used for uplink transmission indicated by the TDD uplink and downlink configuration signaling or a flexible symbol used for uplink transmission indicated by the TDD uplink and downlink configuration.

[0717] As an embodiment, the symbols in the first symbol set are configured to be able to (or can or are allowed to) be uplink transmitted in the first subband.

[0718] As an embodiment, the symbols in the first symbol set are indicated as being able (or may or allowed) to be uplink transmitted in the first subband.

[0719] As an embodiment, the symbols in the first symbol set are configured to be actually uplink transmitted in the first subband.

[0720] As an embodiment, the symbols in the first symbol set are indicated to be actually uplink transmitted in the first subband.

[0721] As an embodiment, the first subband is indicated to be enabled on a symbol in the first symbol set.

[0722] As an embodiment, the RO occupying the frequency domain resources of the first subband in the first symbol set may be selected to send a random access preamble.

[0723] As an embodiment, ROs in the first symbol set that occupy frequency domain resources outside the first subband cannot be selected to send random access preambles.

[0724] As an embodiment, the RO in the first symbol set occupying frequency domain resources overlapping with the first subband and the initial BWP may be selected to send a random access preamble.

[0725] As an embodiment, the RO in the first symbol set occupying frequency domain resources overlapping with the first subband and the active BWP may be selected to send a random access preamble.

[0726] As an embodiment, the symbols in the first symbol set are used for sending and receiving simultaneously.

[0727] As an embodiment, the symbols in the first symbol set support simultaneous uplink transmission and downlink transmission.

[0728] As an embodiment, the sender of the first information block simultaneously receives and sends wireless signals on symbols in the first symbol set.

[0729] As an embodiment, the sender of the first information block performs uplink transmission and downlink transmission simultaneously on the symbols in the first symbol set.

[0730] As an embodiment, the sender of the first information block receives wireless signals on frequency domain resources included in the first subband of the symbols in the first symbol set, and sends wireless signals on frequency domain resources other than the frequency domain resources included in the first subband.

[0731] As an embodiment, the sender of the first information block performs uplink transmission on the frequency domain resources included in the first subband of the symbols in the first symbol set, and performs downlink transmission on the frequency domain resources outside the frequency domain resources included in the first subband.

[0732] Example 14

[0733] Embodiment 14 illustrates a structural block diagram of a processing device in a first node according to an embodiment of the present application, as shown in FIG14 . In FIG14 , the processing device 1400 in the first node includes a first receiver 1401 and a first transmitter 1402 .

[0734] In embodiment 14, the first receiver 1401 receives a first information block, where the first information block indicates a first symbol set; the first transmitter 1402 selects a target RO from a first RO group and sends a random access preamble in the target RO.

[0735] In embodiment 14, the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the RO associated with the first SSB index in an SSB-RO mapping loop, and the at least part of the RO depends on whether the first RO group includes the RO in the first symbol set.

[0736] As an embodiment, the first receiver 1401 receives a second information block, where the second information block indicates a first RO set; each RO in the first RO set is mapped to the first SSB index, and at least one RO among the ROs included in the first RO group belongs to the first RO set.

[0737] As an embodiment, the first receiver 1401 receives a first signaling, which indicates a first PRACH mask index value; among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

[0738] As an embodiment, the more ROs included in the first symbol set are included in the first RO group, the fewer ROs included in the at least part of the ROs.

[0739] As an embodiment, when the first RO group does not include the RO in the first symbol set, the first RO group includes all ROs associated with the first SSB index in an SSB-RO mapping cycle; when the first RO group includes the RO in the first symbol set, the first RO group includes part of the RO associated with the first SSB index in an SSB-RO mapping cycle.

[0740] As an embodiment, the first receiver 1401 receives a target information block; the target information block indicates whether the first symbol set is used for random access; when the first symbol set is used for random access, the first RO group includes the RO in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the RO in the first symbol set.

[0741] As an embodiment, when the first RO group does not include the RO in the first symbol set, the first node selects the target RO from the first RO group with equal probability; when the first RO group includes the RO in the first symbol set, the first node preferentially selects the target RO from K1 ROs in the first RO group, and the K1 ROs do not include the RO in the first symbol set.

[0742] As an embodiment, the first RO set corresponds to the RO mapped to the first SSB index in an associated pattern period, and the ROs included in the first RO group belong to the RO associated to the SSB index in an associated period included in the associated pattern period.

[0743] As an embodiment, the first RO set corresponds to the RO mapped to the first SSB index in an associated pattern period, and the ROs included in the first RO group belong to the RO associated to the first SSB index in an SSB-RO mapping cycle included in the associated pattern period.

[0744] As an embodiment, the first node selects the target RO from the K1 ROs with equal probability according to a first probability, and selects the target RO from ROs other than the K1 ROs in the first RO group with equal probability according to a second probability, the first probability is greater than the second probability, and the first probability and the second probability are both fractions less than 1.

[0745] As an embodiment, the first SSB index is sequentially mapped to N consecutive valid ROs in a given order, the first RO group includes the N valid ROs, and N is a positive integer; the ROs in the first symbol set are considered to be valid ROs, and when the N valid ROs include the ROs in the first symbol set, the first RO includes the ROs in the first symbol set; when the ROs in the first symbol set are not considered to be valid ROs, or when the N valid ROs do not include the ROs in the first symbol set, the first RO does not include the ROs in the first symbol set.

[0746] As a sub-embodiment of this embodiment, the given sequential index is indexed in ascending order of frequency domain resources first and then in ascending order of time domain resources.

[0747] As a sub-embodiment of this embodiment, the given sequential index is indexed in ascending order of time domain resources first and then in ascending order of frequency domain resources.

[0748] As an embodiment, the first node is user equipment.

[0749] As an embodiment, the first node is a relay node device.

[0750] As an embodiment, the first receiver 1401 includes at least one of {antenna 452, receiver 454, receiving processor 456, multi-antenna receiving processor 458, controller / processor 459, memory 460, data source 467} in embodiment 4.

[0751] As an embodiment, the first transmitter 1402 includes at least one of {antenna 452, transmitter 454, transmit processor 468, multi-antenna transmit processor 457, controller / processor 459, memory 460, data source 467} in embodiment 4.

[0752] Example 15

[0753] Embodiment 15 illustrates a structural block diagram of a processing device in a second node according to an embodiment of the present application, as shown in FIG15 . In FIG15 , the processing device 1500 in the second node includes a second transmitter 1501 and a second receiver 1502 .

[0754] In embodiment 15, the second transmitter 1501 sends a first information block, where the first information block indicates a first symbol set; and the second receiver 1502 sends a random access preamble in a target RO.

[0755] In embodiment 15, the receiver of the first information block selects a target RO from a first RO group; the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping loop, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

[0756] As an embodiment, the second transmitter 1501 sends a second information block, where the second information block indicates a first RO set; each RO in the first RO set is mapped to the first SSB index, and at least one RO among the ROs included in the first RO group belongs to the first RO set.

[0757] As an embodiment, the second transmitter 1501 sends a first signaling, wherein the first signaling indicates a first PRACH mask index value; among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

[0758] As an embodiment, the more ROs included in the first symbol set are included in the first RO group, the fewer ROs included in the at least part of the ROs.

[0759] As an embodiment, when the first RO group does not include the RO in the first symbol set, the first RO group includes all ROs associated with the first SSB index in an SSB-RO mapping cycle; when the first RO group includes the RO in the first symbol set, the first RO group includes part of the RO associated with the first SSB index in an SSB-RO mapping cycle.

[0760] As an embodiment, the second transmitter 1501 sends a target information block; the target information block indicates whether the first symbol set is used for random access; when the first symbol set is used for random access, the first RO group includes the ROs in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the ROs in the first symbol set.

[0761] As an embodiment, when the first RO group does not include the RO in the first symbol set, the receiver of the first information block selects the target RO from the first RO group with equal probability; when the first RO group includes the RO in the first symbol set, the receiver of the first information block preferentially selects the target RO from K1 ROs in the first RO group, and the K1 ROs do not include the RO in the first symbol set.

[0762] As an embodiment, the first RO set corresponds to the RO mapped to the first SSB index in an associated pattern period, and the ROs included in the first RO group belong to the RO associated to the SSB index in an associated period included in the associated pattern period.

[0763] As an embodiment, the first RO set corresponds to the RO mapped to the first SSB index in an associated pattern period, and the ROs included in the first RO group belong to the RO associated to the first SSB index in an SSB-RO mapping cycle included in the associated pattern period.

[0764] As an embodiment, the receiver of the first information block selects the target RO from the K1 ROs with equal probability according to a first probability, and from ROs other than the K1 ROs in the first RO group with equal probability according to a second probability, the first probability is greater than the second probability, and the first probability and the second probability are both fractions less than 1.

[0765] As an embodiment, the first SSB index is sequentially mapped to N consecutive valid ROs in a given order, the first RO group includes the N valid ROs, and N is a positive integer; the ROs in the first symbol set are considered to be valid ROs, and when the N valid ROs include the ROs in the first symbol set, the first RO includes the ROs in the first symbol set; when the ROs in the first symbol set are not considered to be valid ROs, or when the N valid ROs do not include the ROs in the first symbol set, the first RO does not include the ROs in the first symbol set.

[0766] As a sub-embodiment of this embodiment, the given sequential index is indexed in ascending order of frequency domain resources first and then in ascending order of time domain resources.

[0767] As a sub-embodiment of this embodiment, the given sequential index is indexed in ascending order of time domain resources first and then in ascending order of frequency domain resources.

[0768] As an embodiment, the second node is a base station device.

[0769] As an embodiment, the second node is user equipment.

[0770] As an embodiment, the second node is a relay node device.

[0771] As an embodiment, the second transmitter 1501 includes at least one of {antenna 420, transmitter 418, transmit processor 416, multi-antenna transmit processor 471, controller / processor 475, memory 476} in embodiment 4.

[0772] As an embodiment, the second receiver 1502 includes at least one of {antenna 420, receiver 418, receiving processor 470, multi-antenna receiving processor 472, controller / processor 475, memory 476} in embodiment 4.

[0773] Those skilled in the art will appreciate that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk or an optical disk. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits. Accordingly, each module unit in the above embodiment can be implemented in the form of hardware or in the form of a software functional module. This application is not limited to any specific form of combination of software and hardware. The user equipment, terminal and UE in this application include but are not limited to drones, communication modules on drones, remote-controlled aircraft, aircraft, small aircraft, mobile phones, tablet computers, notebooks, vehicle-mounted communication equipment, transportation vehicles, vehicles, RSUs, wireless sensors, internet cards, Internet of Things terminals, RFID (Radio Frequency Identification) terminals, NB-IoT (Narrow Band Internet of Things) terminals, MTC (Machine Type Communication) terminals, eMTC (enhanced MTC) terminals, data cards, internet cards, vehicle-mounted communication equipment, low-cost mobile phones, low-cost tablet computers and other wireless communication devices. The base stations or system equipment in this application include but are not limited to macrocell base stations, microcell base stations, small cell base stations, home base stations, relay base stations, eNB (evolved Node B), gNB, TRP, GNSS (Global Navigation Satellite System), relay satellites, satellite base stations, aerial base stations, RSUs, drones, test equipment, such as transceivers or signaling testers that simulate some functions of base stations, and other wireless communication equipment.

[0774] Those skilled in the art will appreciate that the present invention may be implemented in other specific forms without departing from its core or essential characteristics. Therefore, the presently disclosed embodiments should be considered in all respects as illustrative and not restrictive. The scope of the invention is determined by the appended claims, not the foregoing description, and all modifications that come within the meaning and range of equivalents are intended to be embraced therein.

Claims

1. A first node used for wireless communication, characterized in that: include: A first receiver receives a first information block, wherein the first information block indicates a first set of symbols; A first transmitter selects a target RO from a first RO group and sends a random access preamble in the target RO; Among them, the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping cycle, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

2. The first node according to claim 1, characterized in that: include: The first receiver receives a second information block, where the second information block indicates a first RO set; Each RO in the first RO set is mapped to the first SSB index, and at least one RO among the ROs included in the first RO group belongs to the first RO set.

3. The first node according to claim 1 or 2, characterized in that: include: The first receiver receives a first signaling, where the first signaling indicates a first PRACH mask index value; Among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

4. The first node according to any one of claims 1 to 3, characterized in that: The more ROs included in the first symbol set are included in the first RO group, the fewer ROs are included in the at least part of the ROs.

5. The first node according to any one of claims 1 to 4, characterized in that: When the first RO group does not include the RO in the first symbol set, the first RO group includes all ROs associated with the first SSB index in an SSB-RO mapping cycle; when the first RO group includes the RO in the first symbol set, the first RO group includes some ROs associated with the first SSB index in an SSB-RO mapping cycle.

6. The first node according to any one of claims 1 to 5, characterized in that: include: The first receiver receives a target information block; The target information block indicates whether the first symbol set is used for random access; when the first symbol set is used for random access, the first RO group includes the ROs in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the ROs in the first symbol set.

7. The first node according to any one of claims 1 to 6, characterized in that: When the first RO group does not include the RO in the first symbol set, the first node selects the target RO from the first RO group with equal probability; when the first RO group includes the RO in the first symbol set, the first node preferentially selects the target RO from K1 ROs in the first RO group, and the K1 ROs do not include the RO in the first symbol set.

8. A second node used for wireless communication, characterized in that: include: A second transmitter sends a first information block, wherein the first information block indicates a first symbol set; a second receiver, receiving a random access preamble in a target RO; Among them, the receiver of the first information block selects the target RO from the first RO group; the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping cycle, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

9. The second node according to claim 8, characterized in that: include: The second transmitter sends a second information block, where the second information block indicates the first RO set; Each RO in the first RO set is mapped to the first SSB index, and at least one RO among the ROs included in the first RO group belongs to the first RO set.

10. The second node according to claim 8 or 9, characterized in that: include: The second transmitter sends a first signaling, where the first signaling indicates a first PRACH mask index value; Among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

11. The second node according to any one of claims 8 to 10, characterized in that: The more ROs included in the first symbol set are included in the first RO group, the fewer ROs are included in the at least part of the ROs.

12. The second node according to any one of claims 8 to 11, characterized in that: When the first RO group does not include the RO in the first symbol set, the first RO group includes all ROs associated with the first SSB index in an SSB-RO mapping cycle; when the first RO group includes the RO in the first symbol set, the first RO group includes some ROs associated with the first SSB index in an SSB-RO mapping cycle.

13. The second node according to any one of claims 8 to 12, characterized in that: include: The second transmitter sends a target information block; the target information block indicates whether the first symbol set is used for random access; when the first symbol set is used for random access, the first RO group includes the ROs in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the ROs in the first symbol set.

14. The second node according to any one of claims 8 to 13, characterized in that: When the first RO group does not include the RO in the first symbol set, the receiver of the first information block selects the target RO from the first RO group with equal probability; when the first RO group includes the RO in the first symbol set, the receiver of the first information block preferentially selects the target RO from K1 ROs in the first RO group, and the K1 ROs do not include the RO in the first symbol set.

15. A method for a first node used in wireless communication, characterized in that: include: receiving a first information block, the first information block indicating a first set of symbols; selecting a target RO from the first RO group, and sending a random access preamble in the target RO; Among them, the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping cycle, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

16. The method according to claim 15, characterized in that include: A second information block is received, where the second information block indicates a first RO set; wherein each RO in the first RO set is mapped to the first SSB index, and at least one RO among the ROs included in the first RO group belongs to the first RO set.

17. The method according to claim 15 or 16, characterized in that include: A first signaling is received, wherein the first signaling indicates a first PRACH mask index value; wherein, among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

18. The method according to any one of claims 15 to 17, characterized in that The more ROs included in the first symbol set are included in the first RO group, the fewer ROs are included in the at least part of the ROs.

19. The method according to any one of claims 15 to 18, characterized in that When the first RO group does not include the RO in the first symbol set, the first RO group includes all ROs associated with the first SSB index in an SSB-RO mapping cycle; when the first RO group includes the RO in the first symbol set, the first RO group includes some ROs associated with the first SSB index in an SSB-RO mapping cycle.

20. The method according to any one of claims 15 to 19, characterized in that include: Receive a target information block; wherein the target information block indicates whether the first symbol set is used for random access; when the first symbol set is used for random access, the first RO group includes the ROs in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the ROs in the first symbol set.

21. The method according to any one of claims 15 to 20, characterized in that When the first RO group does not include the RO in the first symbol set, the first node selects the target RO from the first RO group with equal probability; when the first RO group includes the RO in the first symbol set, the first node preferentially selects the target RO from K1 ROs in the first RO group, and the K1 ROs do not include the RO in the first symbol set.

22. A method for a second node used in wireless communication, characterized in that: include: Sending a first information block, wherein the first information block indicates a first set of symbols; Receiving a random access preamble in a target RO; Among them, the receiver of the first information block selects the target RO from the first RO group; and the first symbol set includes at least one symbol configured as a downlink symbol by TDD uplink and downlink configuration signaling and used for uplink transmission; the first RO group includes at least part of the ROs associated with the first SSB index in an SSB-RO mapping loop, and the at least part of the ROs depends on whether the first RO group includes the ROs in the first symbol set.

23. The method according to claim 22, characterized in that include: A second information block is sent, where the second information block indicates a first RO set; wherein each RO in the first RO set is mapped to the first SSB index, and at least one RO among the ROs included in the first RO group belongs to the first RO set.

24. The method according to claim 22 or 23, characterized in that include: A first signaling is sent, wherein the first signaling indicates a first PRACH mask index value; wherein, among the ROs associated with the first SSB index in the one SSB-RO mapping cycle, only the ROs indicated by the first PRACH mask index value belong to the first RO group.

25. The method according to any one of claims 22 to 24, characterized in that The more ROs included in the first symbol set are included in the first RO group, the fewer ROs are included in the at least part of the ROs.

26. The method according to any one of claims 22 to 25, characterized in that When the first RO group does not include the RO in the first symbol set, the first RO group includes all ROs associated with the first SSB index in an SSB-RO mapping cycle; when the first RO group includes the RO in the first symbol set, the first RO group includes some ROs associated with the first SSB index in an SSB-RO mapping cycle.

27. The method according to any one of claims 22 to 26, characterized in that include: Sending a target information block; wherein the target information block indicates whether the first symbol set is used for random access; when the first symbol set is used for random access, the first RO group includes the ROs in the first symbol set; when the first symbol set is not used for random access, the first RO group does not include the ROs in the first symbol set.

28. The method according to any one of claims 22 to 27, characterized in that When the first RO group does not include the RO in the first symbol set, the receiver of the first information block selects the target RO from the first RO group with equal probability; when the first RO group includes the RO in the first symbol set, the receiver of the first information block preferentially selects the target RO from K1 ROs in the first RO group, and the K1 ROs do not include the RO in the first symbol set.