System and method for capacity expansion of physical random access channel (PRACH) transmissions

Abstract

Systems and methods for capacity expansion for physical random access channel (PRACH) transmissions are described. A wireless communication device can determine a resource configuration for performing a physical random access channel (PRACH) transmission. The resource configuration can include at least one of one or more parameters for the PRACH transmission or a sequence configuration. The wireless communication device can perform the PRACH transmission in accordance with the resource configuration.

Description

Technical Field

[0001] This disclosure generally relates to wireless communications, including but not limited to capacity expansion systems and methods for Physical Random Access Channel (PRACH) transmission. Background Technology

[0002] The Third Generation Partnership Project (3GPP), a standards organization, is currently defining a new radio interface called 5G New Radio (5G NR) and a Next Generation Packet Core Network (NG-CN or NGC). 5G NR will have three main components: the 5G Access Network (5G-AN), the 5G Core Network (5GC), and User Equipment (UE). To facilitate the implementation of different data services and needs, the elements of 5GC (also known as network functions) have been simplified, some software-based and some hardware-based, allowing them to be adapted as needed. Satellite communication is one of the typical scenarios for non-terrestrial networks in 3GPP standardization. Summary of the Invention

[0003] The exemplary embodiments disclosed herein are intended to address problems related to one or more issues existing in the prior art, and to provide other features that will become apparent from the following detailed description taken in conjunction with the accompanying drawings. Exemplary systems, methods, apparatuses, and computer program products are disclosed herein according to various embodiments. However, it should be understood that these embodiments are presented by way of example and are not limiting, and that various modifications can be made to the disclosed embodiments while remaining within the scope of this disclosure.

[0004] At least one aspect relates to a system, method, apparatus, or computer-readable medium that includes the following: A wireless communication device (e.g., a user equipment (UE)) can determine (e.g., receive, identify, select, establish) a resource configuration for performing a Physical Random Access Channel (PRACH) transmission. The resource configuration may include at least one of the following: one or more parameters for the PRACH transmission, or a sequence configuration. The wireless communication device can perform the PRACH transmission according to the resource configuration. In some embodiments, the wireless communication device may receive the resource configuration for performing the PRACH transmission from a wireless communication node (e.g., a base station (BS)). The one or more parameters for the PRACH transmission may include at least one of the following: the format of the PRACH transmission; the number of repetitions indicating multiple repetitions of the PRACH transmission; the number of time-continuous symbol groups; the number of symbol groups in a preamble repetition unit; the number of identical symbols; or the segment length of uplink pre-compensation.

[0005] In some embodiments, the sequence configuration may include an indication of at least one of the following: sequence type; sequence length; sequence number; or sequence index. The sequence type may include at least one of the following: orthogonal covering code or non-orthogonal covering code. The orthogonal covering code may be based on at least one of the following: Discrete Fourier Transform (DFT) sequence, Walsh sequence, Zadoff-Chu (ZC) sequence, or Hadamard sequence.

[0006] In some embodiments, the sequence length can be determined based on one or more parameters used for the PRACH transmission by at least one of the following: the length of identical symbols in a symbol group, or the total number of symbol groups in a preamble repetition unit multiplied by the number of identical symbols in the symbol group, or the total number of symbol groups in a preamble repetition unit, or the number of repetitions of the Physical Random Access Channel (PRACH) (e.g., attempting to perform the PRACH or NPRACH transmission / procedure), or the total number of symbol groups in the preamble repetition unit multiplied by the number of PRACH repetitions, or the total number of symbol groups in the preamble repetition unit divided by the number of time-continuous symbol groups within the preamble repetition unit, or the total number of symbol groups in the preamble repetition unit multiplied by the size of the preamble repetition group and then divided by the number of time-continuous symbol groups within the preamble repetition unit. The size of the preamble repetition group can be configured by higher-layer signaling. The size of the preamble repetition group can be equal to the number of repetitions in the PRACH transmission.

[0007] In some embodiments, the sequence length can be determined based on a first indication configured by higher-layer signaling. The first indication can be at least one of the following: a second indication indicating the sequence length; a third indication indicating the size of the preamble repeat group, wherein the sequence length can be determined by multiplying the total number of symbol groups in the preamble repeat unit by the size of the preamble repeat group; a fourth indication indicating the number of time-continuous symbol groups within the preamble repeat unit, wherein the sequence length can be determined by dividing the total number of symbol groups in the preamble repeat unit by the number of time-continuous symbol groups within the preamble repeat unit; a fifth indication indicating the size of the preamble repeat group; and a sixth indication indicating the number of time-continuous symbol groups within the preamble repeat unit, wherein the sequence length can be determined by multiplying the total number of symbol groups in the preamble repeat unit by the size of the preamble repeat group and then dividing by the number of time-continuous symbol groups within the preamble repeat unit; and a seventh indication indicating both the sequence type and the sequence length. For example, "Type-1" can refer to Orthogonal Cover Code (OCC)-2, which can implicitly indicate that the sequence length is 2. "Type-2" can refer to OCC-4, which implicitly indicates that the sequence length is 4. "Type-3" can refer to OOC-8, which implicitly indicates that the sequence length is 8. In some embodiments, the number of sequences can be determined based on at least one of the following: the sequence length, or higher-layer signaling. The sequence index can be determined based on the user equipment (UE) identifier (ID), or randomly determined by the user equipment (UE).

[0008] In some embodiments, the wireless communication device may determine a set of sequences corresponding to the sequence length. The wireless communication device may determine a specific sequence based on the sequence index and the set of sequences. The wireless communication device may apply the sequence to the PRACH transmission. In some embodiments, applying the sequence may include one or more units for applying the sequence to the PRACH transmission. The one or more units may include at least one of the following: a symbol; a symbol group; a time-continuous symbol group; a preamble repetition unit; or a preamble repetition group.

[0009] In some embodiments, the sequence length indicated in the second or seventh indication may be a specific value. The specific value may correspond to one or more units. In some embodiments, the sequence length indicated in the seventh indication may correspond to one or more units. In some embodiments, the sequence length may be determined based on the segment length for pre-compensation configured by higher-layer signaling.

[0010] In some embodiments, applying the sequence may include using / applying / activating a scheme for applying the sequence. The scheme for applying the sequence may include at least one of the following: applying the sequence by the wireless communication device across one or more symbols within a symbol group, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the symbol group; applying the sequence by the wireless communication device across one or more symbols within a preamble repetition unit, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the preamble repetition unit; applying the sequence by the wireless communication device across one or more symbol groups within a preamble repetition unit, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the preamble repetition unit; applying the sequence by the wireless communication device across one or more symbol groups within a preamble repetition unit, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the preamble repetition unit; applying the sequence by the wireless communication device across one or more sets of symbol groups within a preamble repetition unit, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the preamble repetition unit. Multiply by a corresponding subset of the symbol group set within the preamble repetition unit; apply the sequence by the wireless communication device across one or more symbol group sets within the preamble repetition unit and apply a set of sequences to each symbol group within the symbol group set, wherein the application may include each element of the sequence being multiplied by a corresponding subset of the symbol group set within the preamble repetition unit and a set of sequence elements being multiplied by each symbol group within the symbol group set; apply the sequence by the wireless communication device across one or more symbol group sets within the preamble repetition group, wherein the application may include each element of the sequence being multiplied by a corresponding subset of the symbol group set within the preamble repetition group; apply the sequence by the wireless communication device across one or more preamble repetition units within the repetition group, wherein the application may include each element of the sequence being multiplied by a corresponding subset of the repetition units within the preamble repetition group; or apply the sequence by the wireless communication device across one or more preamble repetition groups, wherein the application may include each element of the sequence being multiplied by a corresponding subset of the preamble repetition group.

[0011] In some embodiments, the sequence can be applied to the PRACH transmission when certain conditions are met. These conditions may include at least one of the following: an eighth indication indicating the application of the sequence to (e.g., indicating application) the PRACH transmission; a ninth indication indicating which sequence application scheme to activate; satisfaction of a signal strength-related criterion; satisfaction of a frequency offset-related criterion; satisfaction of a timing offset-related criterion; or satisfaction of a UE mobility state-related criterion. These criteria may include at least one of the following: a measured signal strength (e.g., Reference Signal Received Power (RSRP), SINR) higher than a first configured threshold; a measured signal strength equal to the first configured threshold; a frequency offset lower than a second configured threshold; a frequency offset equal to the second configured threshold; a timing offset lower than a third configured threshold; a timing offset equal to the third configured threshold; a mobility state lower than a fourth configured threshold; or a mobility state (e.g., UE speed) equal to the fourth configured threshold. If only one threshold is configured, the wireless communication device can use that threshold. If multiple thresholds are configured, the wireless communication device can use at least one of the multiple thresholds (e.g., a minimum threshold, a second minimum threshold, or a maximum threshold).

[0012] In some embodiments, the wireless communication device may determine whether the length of the sequence is associated with one or more thresholds (e.g., if there is only one threshold and the measured signal strength is lower than the first configured threshold, the sequence length is determined to be length-1 (e.g., length-1 can be equal to zero), and if the measured signal strength is higher than the first configured threshold, the sequence length is determined to be length-2; or if there are multiple thresholds and the measured signal strength is higher than the first configured threshold_A, the sequence length is determined to be length-1, and if the measured signal strength is higher than the first configured threshold_B, the sequence length is determined to be length-2; or if there is only one threshold and the frequency offset, timing offset, or movement state is higher than the configured threshold, the sequence length is determined to be length-1 (e.g., length-1 can be equal to zero), and if the frequency offset, timing offset, or movement state is lower than the configured threshold, the sequence length is determined to be length-2; or if there are multiple thresholds, if the frequency offset, timing offset, or movement state is higher than the configured threshold_A, the sequence length is determined to be length-1, and if the frequency offset, timing offset, or movement state is lower than the configured threshold_B, the sequence length is determined to be length-2). In some embodiments, the wireless communication device can determine the segment length based on the sequence length. The wireless communication device can perform uplink (UL) pre-compensation based on the segment length.

[0013] In some embodiments, a wireless communication node (e.g., a base station (BS) or gNB) can receive Physical Random Access Channel (PRACH) transmissions from a wireless communication device (e.g., a UE) according to a resource configuration. The resource configuration can be configured by the wireless communication node. The resource configuration may include at least one of the following: one or more parameters for the PRACH transmission, or a sequence configuration. Attached Figure Description

[0014] Various exemplary embodiments of this solution are described in detail below with reference to the accompanying drawings. The drawings are provided for illustrative purposes only and depict exemplary embodiments of the solution to aid the reader's understanding. Therefore, these drawings should not be considered as limitations on the breadth, scope, or applicability of the solution. It should be noted that these drawings are not necessarily drawn to scale for clarity and ease of explanation.

[0015] Figure 1 An exemplary cellular communication network according to one embodiment of this disclosure, in which the techniques disclosed herein may be implemented, is shown; Figure 2 Block diagrams of exemplary base stations and user equipment according to some embodiments of the present disclosure are shown; Figure 3 Exemplary implementations of non-terrestrial networks (NTNs) according to some embodiments of this disclosure are shown; Figure 4 Exemplary symbol groups for Physical Random Access Channel (PRACH) transmissions according to some embodiments of this disclosure are shown; Figure 5 Exemplary transmission modes for Narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 6 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 7 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 8 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 9 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 10 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 11 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 12 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 13 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 14 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 15 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 16 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 17 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 18 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 19 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 20 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 21 Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 22 Exemplary transmission modes for Physical Random Access Channel (PRACH) transmission according to some embodiments of this disclosure are shown; Figure 23Exemplary transmission modes for narrowband Physical Random Access Channel (NPRACH) transmissions according to some embodiments of this disclosure are shown; Figure 24 Exemplary transmission modes for Physical Random Access Channel (PRACH) transmission according to some embodiments of this disclosure are shown; and Figure 25 A flowchart illustrating an exemplary method for capacity expansion of Physical Random Access Channel (PRACH) transmission according to an embodiment of this disclosure is shown. Detailed Implementation

[0016] 1. Mobile Communication Technology and Environment Figure 1 An exemplary wireless communication network and / or system 100 according to one embodiment of this disclosure, in which the techniques disclosed herein may be implemented, is illustrated. In the following discussion, the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of Things (NB-IoT) network, and is referred to herein as "network 100". This exemplary network 100 includes base station 102 (hereinafter referred to as "BS 102"; also called a wireless communication node) and user equipment 104 (hereinafter referred to as "UE 104"; also called a wireless communication device), which may communicate with each other via communication link 110 (e.g., a wireless communication channel), and cell clusters 126, 130, 132, 134, 136, 138, and 140 covering a geographic area 101. Figure 1 In this context, BS 102 and UE 104 are contained within the corresponding geographical boundaries of cell 126. Each of the other cells 130, 132, 134, 136, 138, and 140 may include at least one base station operating with its allocated bandwidth to provide sufficient radio coverage to its intended users.

[0017] For example, BS 102 can operate with allocated channel transmission bandwidth to provide sufficient coverage to UE 104. BS 102 and UE 104 can communicate via downlink radio frame 118 and uplink radio frame 124, respectively. Each radio frame 118 / 124 can be further divided into subframes 120 / 127, which may include data symbols 122 / 128. In this disclosure, BS 102 and UE 104 are described herein as non-limiting examples of "communication nodes" that can generally practice the methods disclosed herein. According to various embodiments of this solution, such communication nodes may be able to perform wireless and / or wired communication.

[0018] Figure 2A block diagram of an exemplary wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) according to some embodiments of this solution is shown. The system 200 may include components and elements configured to support known or conventional operating characteristics, which do not need to be described in detail herein. In one illustrative embodiment, the system 200 may be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment such as those described above. Figure 1 Wireless communication environment 100.

[0019] System 200 generally includes a base station 202 (hereinafter referred to as "BS 202") and a user equipment 204 (hereinafter referred to as "UE 204"). BS 202 includes a BS (Base Station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each module being coupled and interconnected with each other as needed via a data communication bus 220. UE 204 includes a UE (User Equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each module being coupled and interconnected with each other as needed via a data communication bus 240. BS 202 communicates with UE 204 via a communication channel 250, which may be any wireless channel or other medium suitable for data transmission as described herein.

[0020] As will be understood by those skilled in the art, system 200 may further include, in addition to Figure 2 Any number of modules other than those shown. Those skilled in the art will understand that the various illustrative blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein can be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps have generally been described according to their functionality. Whether this functionality is implemented as hardware, firmware, or software can depend on the specific application and design constraints imposed on the system as a whole. Those skilled in the art can implement this functionality in a manner suitable for each specific application, but such implementation decisions should not be construed as limiting the scope of this disclosure.

[0021] According to some embodiments, UE transceiver 230 may be referred to herein as "uplink" transceiver 230, which includes a radio frequency (RF) transmitter and an RF receiver, each including circuitry coupled to antenna 232. A duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in a time-duplex manner. Similarly, according to some embodiments, BS transceiver 210 may be referred to herein as "downlink" transceiver 210, which includes an RF transmitter and an RF receiver, each including circuitry coupled to antenna 212. A downlink duplex switch may alternatively couple the downlink transmitter or receiver to downlink antenna 212 in a time-duplex manner. The operation of the two transceiver modules 210 and 230 may be time-coordinated such that the uplink receiver circuitry is coupled to the uplink antenna 232 to receive transmissions via the wireless transmission link 250, while the downlink transmitter is coupled to the downlink antenna 212. Conversely, the operation of the two transceivers 210 and 230 can be time-coordinated, such that the downlink receiver is coupled to the downlink antenna 212 to receive transmissions via the wireless transmission link 250, while the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is tight time synchronization and a minimum guard time between duplex direction changes.

[0022] UE transceiver 230 and base transceiver 210 are configured to communicate via wireless data communication link 250 and cooperate with appropriately configured RF antenna arrangements 212 / 232, which may support specific wireless communication protocols and modulation schemes. In some illustrative embodiments, UE transceiver 210 and base transceiver 210 are configured to support industry standards such as Long Term Evolution (LTE) and emerging 5G standards. However, it should be understood that this disclosure is not necessarily limited to the application of specific standards and associated protocols. Rather, UE transceiver 230 and base transceiver 210 may be configured to support alternative or additional wireless data communication protocols, including future standards or variations thereof.

[0023] According to various embodiments, BS 202 may be, for example, an evolved Node B (eNB), a serving eNB, a target eNB, a femtocell, or a picocell. In some embodiments, UE 204 may be embodied in various types of user equipment, such as mobile phones, smartphones, personal digital assistants (PDAs), tablets, laptops, wearable computing devices, and so on. Processor modules 214 and 236 may be implemented or implemented using a general-purpose processor, content-addressable memory, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. In this way, the processor may be implemented as a microprocessor, a controller, a microcontroller, a state machine, etc. The processor may also be implemented as a combination of computing devices, such as a combination of a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other such configuration.

[0024] Furthermore, the steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be directly embodied in hardware, firmware, software modules executed by processor modules 214 and 236 respectively, or any actual combination thereof. Memory modules 216 and 234 can be implemented as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 can be coupled to processor modules 210 and 230 respectively, such that processor modules 210 and 230 can read information from and write information to memory modules 216 and 234 respectively. Memory modules 216 and 234 can also be integrated into their respective processor modules 210 and 230. In some embodiments, memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during the execution of instructions to be executed by processor modules 210 and 230 respectively. Memory modules 216 and 234 may each include non-volatile memory for storing instructions to be executed by processor modules 210 and 230, respectively.

[0025] Network communication module 218 generally refers to the hardware, software, firmware, processing logic, and / or other components of base station 202 that enable bidirectional communication between base station transceiver 210 and other network components, as well as communication nodes configured to communicate with base station 202. For example, network communication module 218 may be configured to support Internet or WiMAX traffic. In a typical, unrestricted deployment, network communication module 218 provides an 802.3 Ethernet interface, allowing base station transceiver 210 to communicate with legacy Ethernet-based computer networks. In this way, network communication module 218 may include a physical interface for connecting to said computer network (e.g., a Mobile Switching Center (MSC)). The terms "configured for," "configured to," and variations thereof, as used herein, with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc., that is physically constructed, programmed, formatted, and / or arranged to perform said specified operation or function.

[0026] The Open Systems Interconnection (OSI) model (referred to herein as the "OSI model") is a conceptual and logical layout that defines network communications used by open systems (e.g., wireless communication devices, wireless communication nodes) that can interconnect and communicate with other systems. The model is divided into seven sub-components or layers, each representing a conceptual set of services provided to the layers above and below it. The OSI model also defines logical networks and efficiently describes computer packet transmissions using different layer protocols. The OSI model may also be referred to as the seven-layer OSI model or the seven-layer model. In some embodiments, the first layer may be the physical layer. In some embodiments, the second layer may be the Medium Access Control (MAC) layer. In some embodiments, the third layer may be the Radio Link Control (RLC) layer. In some embodiments, the fourth layer may be the Packet Data Convergence Protocol (PDCP) layer. In some embodiments, the fifth layer may be the Radio Resource Control (RRC) layer. In some embodiments, the sixth layer may be a Non-Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer may be any other layer.

[0027] Various exemplary embodiments of the present solution are described below with reference to the accompanying drawings to enable those skilled in the art to manufacture and use the present solution. As will be understood by those skilled in the art upon reading this disclosure, various changes or modifications can be made to the examples described herein without departing from the scope of the present solution. Therefore, the present solution is not limited to the exemplary embodiments and applications described and illustrated herein. Furthermore, the specific order or hierarchy of steps in the methods disclosed herein is merely exemplary. Based on design preferences, the specific order or hierarchy of steps in the disclosed methods or processes may be rearranged while maintaining the scope of the present solution. Therefore, those skilled in the art will understand that the methods and techniques disclosed herein present various steps or actions in an exemplary order, and unless otherwise expressly stated, the present solution is not limited to the specific order or hierarchy presented.

[0028] 2. Capacity extension system and method for Physical Random Access Channel (PRACH) transmission To address the challenges posed by limited resources and a large number of User Equipment (UEs), one approach is to enhance uplink capacity. With the adoption of non-terrestrial networks (NTNs), satellite communication systems can serve a wider and more diverse range of UEs due to their extensive coverage. Uplink (UL) coverage enhancement can be part of new radio (NR) NTN enhancements, including techniques such as duplication. Furthermore, for certain use cases such as the Internet of Things (IoT), duplication can be adopted / supported to extend uplink coverage.

[0029] Although random access initiated by narrowband (NB)-IoT UEs occurs at a lower frequency, Physical Random Access Channel (PRACH) capacity may not be a primary concern for NB-IoT. Therefore, for single-tone transmission, NB-IoT may not allow multiple UEs to multiplex the same tone, limiting capacity in power-constrained scenarios. Furthermore, NB-IoT NTN deployments may reveal a pressing need to support large-scale capacity across various UE types, including lower-cost devices and wearables. Therefore, capacity analysis of NTN UL systems may have its limitations. This disclosure describes methods for extending PRACH capacity in Terrestrial Network (TN) / Non-Terrestrial Network (NTN) systems.

[0030] Figure 3 Exemplary implementations of non-terrestrial networks (NTNs) according to some embodiments of this disclosure are shown. An exemplary structure of a transparent NTN is shown in... Figure 3In this context, the link between the UE and the satellite can be a serving link. The link between the BS and the satellite can be a feeder link, and can be shared by all UEs within the same cell.

[0031] Narrowband Physical Random Access Channel (NPRACH) Design Physical layer random access preambles can be based on single-subcarrier frequency-hopping symbol groups. One type of symbol group... Figure 4 As shown in the figure. The symbol group may include a length of T. CP The cyclic prefix and the total length of T SEQ A sequence of N identical symbols. The total number of symbol groups in the preamble repetition unit can be represented by P. The number of time-continuous symbol groups can be given by G. The preamble sequence in each symbol group can include a constant sequence; for example, all symbols can be the same (e.g., 1).

[0032] The parameter values ​​for frame structure 1 (e.g., FDD) and frame structure 2 (e.g., TDD) are listed in Table 1 and Table 2, respectively.

[0033] Table 1: Random Access Preamble Parameters for Frame Structure Type 1

[0034]

[0035] Table 2: Random Access Preamble Parameters for Frame Structure Type 2

[0036]

[0037] The preamble may include P symbol groups, which can be transmitted. The number of times can be configured by the higher-level signaling numRepetitionsPerPreambleAttempt and can represent the number of NPRACH repetitions in each attempt. For example, when the current preamble format is 0 / 1 and numRepetitionsPerPreambleAttempt is 2, then G=4, P=4, N=5 and N_rep^NPRACH (e.g., The value is 2, and the existing transmission is as follows: Figure 5 As shown. Figure 5 An exemplary NPRACH transmission mode (no sequence multiplexing) with frequency hopping is shown.

[0038] For example, when the current precode format is 2 and numRepetitionsPerPreambleAttempt is 2, then G=6, P=6, N=3 and The value is 2, and the existing transmission is as follows: Figure 6 As shown. Figure 6An exemplary NPRACH transmission mode (no sequence multiplexing) with frequency hopping is shown.

[0039] Furthermore, to address the impact of timing errors caused by large timing drift rates due to satellite motion on PRACH transmission, UL pre-compensation for PRACH transmission can be supported. Since segment length is already supported in IoT NTN, UL pre-compensation for PRACH can be indicated by the BS. Specifically, the segment length of NPRACH for preamble formats 0 and 1 can be indicated by the parameter nprach-TxDurationFmt01-r17, where this value can be configured as {n2, n4, n8, n16, n32, n64}, and indicates the duration of PRACH segment transmission for PRACH resource formats 0 and 1 in NTN transmission, associated with the duration of four preamble transmissions, L. segmentUnit For example, 4 * (T) CP +T SEQ For example, the value n2 can correspond to the duration of 2 * 4 * preamble transmissions, the value n4 can correspond to the duration of 4 * 4 * preamble transmissions, and so on. The segment length of NPRACH in preamble format 2 can be indicated by the parameter nprach-TxDurationFmt2-r17, where the value can be configured as {n1, n2, n4, n8, n16}, and can indicate the duration of PRACH segment transmissions for PRACH resource format 2 in NTN transmissions, associated with the duration of six preamble transmissions, L segmentUnit For example, 6 * (T) CP +T SEQ For example, the value n1 can correspond to the duration of 1 * 6 * preamble transmission, the value n2 can correspond to the duration of 2 * 6 * preamble transmission, and so on. This method can meet / solve timing error requirements during PRACH transmission.

[0040] To expand the capacity of random access, multiple UEs can multiplex the same time-frequency resources using application sequences. The sequence length can be configured jointly with at least one of symbol group length, repetition, and time-continuous symbol groups, or configured by higher-layer signaling, etc. Specifically, the following methods for sequence configuration can be considered. In the following disclosure, "A * B" means A multiplied by B; "A / B" means A divided by B.

[0041] Implementation Example 1: Sequence Configuration The sequence configuration may include / indicate / specify at least one of the following: sequence type, sequence length, sequence number, or sequence index.

[0042] For sequence types: the sequence can be at least an orthogonal overlay code or a non-orthogonal overlay code. The orthogonal overlay code can be based on at least one of the following: Discrete Fourier Transform (DFT) sequence, Walsh sequence, Zadolf-Ju (ZC) sequence, or Hadamard sequence. If more than one sequence type can be used for PRACH multiplexing, a specific sequence type can be configured by higher-layer signaling. The sequence type can be configured by at least one of the following methods.

[0043] - A field indicating the sequence type, for example, "1" can indicate "OCC", "2" can indicate "non-OCC", or "1" can indicate "DFT-based sequence", "2" can indicate "Walsh sequence", and so on. Furthermore, the sequence type can also be configured together with the sequence length defined below.

[0044] Regarding sequence length: the sequence length L Length This can be determined based on parameters of the PRACH configuration (or resource configuration). For example, the network can indicate the sequence length L using parameters of the PRACH channel. Length The network / UE can determine the sequence length L based on the parameters configured in the PRACH configuration. Length In some embodiments, the UE can autonomously determine the sequence length L based on the parameters of the PRACH channel. Length In some cases, taking the NR scenario as an example, the L... Length It can be determined by at least one of the number of repetitions of the preamble / PRACH corresponding to the configured PRACH format, etc. Taking the parameters in the IoT scenario as an example, the L Length It can be determined by at least one of the following methods / approaches: - The length of the same symbol N in the symbol group, or - The total number of symbol groups P in the preamble repetition unit * The number of identical symbols N in the symbol group, or - The total number P of symbol groups in the preamble repetition unit, or - Number of repetitions in NPRACH ,or - The total number of symbol groups in the preamble repetition unit, P * the number of repetitions of NPRACH. ,or - The total number of symbol groups P in the preamble repetition unit / the number of time-continuous symbol groups G within the preamble repetition unit, or - Total number of symbol groups in the preamble repetition unit P * Size of the preamble repetition group X / Number of time-continuous symbol groups G in the preamble repetition unit, wherein the size of the preamble repetition group X can be configured by higher-level signaling, and X can be equal to the number of NPRACH repetitions.

[0045] The sequence length L Length This can be determined based on the defined fields, which can be configured at least via higher-level signaling: - Indicates the sequence length L Length The field, L Length It can have at least one value from {2,3,4,5,6,7,8,9,10,11,12, etc.}. Length The granularity can be at the symbol level, symbol group level, preamble repetition unit level, etc., or - A field indicating the size X of the preamble repeat group, where the sequence length L is... Length It can have a value that can be determined based on the total number of symbol groups P * the size X of the preamble repeating unit, or - A field indicating the number of time-continuous symbol groups within a preamble repetition unit, the sequence length L Length It can have a value that can be determined by the total number of symbol groups P in the preamble repetition unit / the number of time-continuous symbol groups R within the preamble repetition unit, where R can be equal to G, or - A field indicating the size X of the preamble repetition group and the number of time-continuous symbol groups within the preamble repetition unit, the sequence length L. Length It can have a value determined by the total number of symbol groups in the preamble repetition unit P * the size of the preamble repetition group X / the number of time-continuous symbol groups Z within the preamble repetition unit, where Z can be configured by higher-level signaling and can be equal to G. - Indicates the sequence length L Length For fields where the preamble is repeated, repeating preambles can be grouped into repeating groups (e.g., the number of NPRACH repeats per attempt). / Sequence length L Length PRACH repeat count / sequence length L Length ), - The field indicating the sequence type implicitly indicates the sequence length L Length For example, "Type-1" can refer to OCC-2, which implicitly indicates the sequence length L. Length The value is 2, and "Type-2" can refer to OCC-4, which implicitly indicates the sequence length L. Length The value is 4, and "Type-3" can refer to OOC-8, which implicitly indicates the sequence length L. Length It is 8. L Length The granularity can be at the symbol level, symbol group level, or preamble repetition unit level.

[0046] - To enhance the capacity of PRACH, a combination of sequence length and segment length can be considered.

[0047] Sequence length: The sequence length can be associated with the segment length used for UL pre-compensation.

[0048] - L Length_actual = min (N* L segmentUnit * L segment / T seq_unit , L Length ), where L segment This can be the {nX} duration of the PRACH segment transmission in NTN transmission, and the unit of duration can be four / six preamble transmissions, L Length It can be the initial configuration, for example, through the method shown above.

[0049] - T seq_unit It can be the time duration of a sequence unit, where symbols within the time duration of a sequence unit have the same value applied throughout the sequence. T seq_unit It may include one or more symbols, a symbol group, a preamble repetition unit, a preamble repetition group, and / or a time-continuous symbol group.

[0050] - Implicitly configured via segment length. For example, the scaling factor of the segment length, which can be 1 / 256, 1 / 128, 1 / 64, ..., 1 / 2, 1, etc. The sequence length L Length It can be calculated from (scalingFactor*N*L) segmentUnit *L segment ) / T seq_unit Sure.

[0051] For the number of sequences (e.g., bit width, used by the UE to select the sequence index), the number of sequences can be determined based on at least one of the following: - The number of sequences can be determined based on configured parameters, such as sequence length L. Length The bit width used for sequence index indication can be ,or - The number of sequences can be configured by higher-layer signaling. For example, for 8, the bit width used for sequence index indication can be 3 bits, and the corresponding sequence length can be greater than or equal to 8.

[0052] Sequence Index: The sequence index used for multiplexing can be determined by the UE in the corresponding L. Length Randomly select from the set of sequences or use those with UE ID (e.g., IMSI, RNTI, the relationship can be mod(UE ID, L)). Length Choose based on associations such as (etc.).

[0053] In other methods, the segment length can be determined by L. Length Implicit determination.

[0054] - The segment length can be equal to the sequence length or the scaling factor multiplied by the sequence length, where the scaling factor can be 1, 2, 3, 4, ... etc. The segment length can be calculated by (scalingFactor * L). Length * T seq_unit ) / (N * L segmentUnit ) Sure.

[0055] - Implicitly indicate the length of segmented pre-compensation for each elevation angle. For example, the sequence length can be indicated by the above signaling, and the length of segmented pre-compensation for each elevation angle can be indicated by the BS using the following method.

[0056] a) Option 1: With sequence length L Length The mapping between the associated elevation angle and the segmented pre-compensation length can be broadcast by the BS using a scaling factor. The UE can use the elevation angle, scaling factor, and sequence length L estimated by the Global Navigation Satellite System (GNSS). Length To determine the length of the segmented pre-compensation for performing UL pre-compensation.

[0057] Table 3: Elevation Angle and Sequence Length L Length The mapping relationship between scaling factors.

[0058]

[0059] For example, the BS can broadcast N sets of elevation angle and scaling factor parameters via N sets of {elevation angle, scaling factor}, or the relationship can be implicitly signaled via a bitmap to index the L used for UL pre-compensation. Length The corresponding scaling factor, and each bit of the bitmap can represent each elevation angle.

[0060] Table 4: Elevation Angle and Sequence Length L Length The mapping relationship between scaling factors.

[0061]

[0062] b) Option 2: The UE can perform UL pre-compensation L for the segment length. Length Optionally, if the UE does not receive the UL pre-compensation sequence length L from the BS for indicating PRACH, LengthThe signaling of the scaling factor. The UE can perform UL pre-compensation by default based on the sequence length. Otherwise, the UE can perform UL pre-compensation based on the BS's instruction, such as the elevation angle and the sequence length L. Length The mapping relationship between scaling factors.

[0063] c) Option 3: The UE can use the elevation angle and sequence length L for UL pre-compensation. Length The mapping between scaling factors is stored in memory and does not need to be broadcast by the base station.

[0064] Furthermore, whether to apply a sequence to a PRACH transmission can be indicated by the aforementioned signaling, or by higher-layer signaling or DCI signaling. For example, configuring a sequence type, sequence length, or sequence number can indicate that the sequence should be applied to the PRACH transmission. In some embodiments, when signaling is configured to be enabled on the network side via higher-layer signaling or DCI signaling, it can indicate that the sequence should be applied to the PRACH transmission.

[0065] Example 2 defines several application schemes, and specific schemes can also be configured by the network side via signaling. For example, when the indicator indicates "1", it can indicate the application / activation / selection of the scheme case-1-a. When the indicator indicates "2", it can indicate the application / activation / selection of the scheme case-2-a.

[0066] Implementation Example 2: Sequence Application The sequence can be applied to the signal at different units of the PRACH, such as the symbol level, repetition level, repetition group level, etc. Specifically, the following methods for sequence multiplexing can be considered.

[0067] Example 1: The multiplexing can consider sequences across symbols. Case-1: The UE can apply a sequence across symbols within each symbol group to the preamble sequence to extend the capacity for PRACH transmission. The sequence can be the same across different symbol groups within the preamble repetition unit. Symbols within a symbol group can be referred to as the time duration of the sequence unit. This process can be applied to any PRACH format (e.g., NPRACH format 0 / 1 / 2 / 0-a / 1-a, PRACH format 0 / 1 / 2 / 3 / A1 / A2 / A3 / B1 / B2 / B3 / B4 / C0 / C2). An IoT scenario can be an example.

[0068] Case-1-a: When G=4, P=4, N=5, = 1、L Length When =5, the preamble x in the i-th symbol group. i According to x seq= w n * x i Multiplied by sequence w n , where x i It is the preamble sequence in each symbol group, i=1, ..., P. And w n It can be the UE corresponding to L Length The nth sequence selected from the set of sequences. Figure 7 An exemplary NPRACH transmission following the application of a sequence across symbols within a symbol group is shown.

[0069] Case-1-b: When G=4, P=4, N=5, = 1、L Length When =4, the preamble x on one or more symbols in the i-th symbol group i According to x seq = w n * x i Multiplied by sequence w n , where x i It is a sequence of preambles on one or more symbols in each symbol group, i = 1,..., P. For example, the one or more symbols are relatively close to the middle of each symbol group or located on the symbols starting from the first data symbol in each symbol group, and the preamble remains unchanged on the other symbols. And w n Is the UE in the corresponding L Length The nth sequence selected from the set of sequences. Figure 8 An exemplary NPRACH transmission is shown after applying a sequence across partial symbols within a symbol group.

[0070] Case-1-c: When G=6, P=6, N=3, = 1、L Length When =3, the preamble x in the i-th symbol group. i According to x seq = w n * x i Multiplied by sequence w n , where x i It can be the preamble sequence in each symbol group, i=1,...,P. And w n It can be the UE corresponding to L Length The nth sequence selected from the set of sequences. Figure 9 An exemplary NPRACH transmission following the application of a sequence across symbols within a symbol group is shown.

[0071] Case-1-d: When G=6, P=6, N=5, = 1、L Length When =4, the preamble x on one or more symbols in the i-th symbol group i According to x seq = w n * x i Multiplied by sequence w n , where x i It can be a preamble sequence on one or more symbols in each symbol group, i = 1,..., P. For example, the one or more symbols are relatively close to the middle of each symbol group or located on the symbols starting from the first data symbol in each symbol group, and the preamble remains unchanged on the other symbols. And w n Is the UE in the corresponding L Length The nth sequence selected from the set of sequences. Figure 10 An exemplary NPRACH transmission is shown after applying a sequence across partial symbols within a symbol group.

[0072] Case-2: The UE can apply symbols from a symbol group within a preamble repeat unit to the preamble sequence to extend the PRACH capacity. The sequence can be the same across different preamble repeat units. The symbols within a preamble repeat unit can be referred to as the time duration of the sequence unit. This process can be applied to any PRACH format (e.g., NPRACH format 0 / 1 / 2 / 0-a / 1-a, PRACH format 0 / 1 / 2 / 3 / A1 / A2 / A3 / B1 / B2 / B3 / B4 / C0 / C2). An IoT scenario can be an example.

[0073] Case-2-a: When G=4, P=4, N=5, = 1、L Length When =20, the preamble x in the i-th repeating unit i According to x seq = w n * x i Multiplied by sequence w n , where x i It can be the preamble sequence in the i-th repeating unit, i = 1,..., And w n It can be the UE corresponding to L Length The nth sequence selected from the set of sequences. Figure 11An exemplary NPRACH transmission is shown after a sequence of symbols applied across a symbol group within a preamble repetition unit.

[0074] Case-2-b: When G=4, P=4, N=5, = 1、L Length When =12, the preamble x on one or more symbols in the i-th symbol group i According to x seq = w n (i) * x i Multiplied by sequence w n , where x i It can be a preamble sequence on one or more symbols in the i-th symbol group, i = 1,..., P. The one or more symbols can be the symbols starting from the first data symbol in each symbol group, and the preamble can remain unchanged on other symbols, and w n It can be the UE corresponding to L Length The nth orthogonal sequence selected from the set of sequences. n (i) can be w n The set of the i-th sequence values ​​belonging to the i-th symbol group. Figure 12 An exemplary NPRACH transmission is shown after applying a sequence of partial symbols across a symbol group within a preamble repetition unit.

[0075] Case-2-c: When G=4, P=4, N=5, = 1、L Length When =6, the preamble x on one or more symbols in the i-th symbol group i According to x seq = w n (i) * x i Multiplied by sequence w n , where x i It can be a preamble sequence on one or more symbols in the i-th symbol group, i = 1,..., P. The one or more symbols can be relatively close to the middle of each symbol group, and the preamble can remain unchanged on other symbols, and w n It can be the UE corresponding to L Length The nth sequence selected from the set of sequences. n (i) can be w n The set of the i-th sequence values ​​belonging to the i-th symbol group. Figure 13An exemplary NPRACH transmission is shown after applying a sequence of partial symbols across a symbol group within a preamble repetition unit.

[0076] Example 2: The reuse can be considered across symbol groups of sequences.

[0077] Case-3: The UE can apply a sequence of symbols across preamble repetition units (e.g., symbols across symbol groups) to the preamble sequence to extend the PRACH capacity. The sequence can be identical across different preamble repetition units. The sequence can be identical within symbol groups. The symbols within a symbol group in a preamble repetition unit can be referred to as the time duration of the sequence unit. This process can be applied to any PRACH format (e.g., NPRACH format 0 / 1 / 2 / 0-a / 1-a, PRACH format 0 / 1 / 2 / 3 / A1 / A2 / A3 / B1 / B2 / B3 / B4 / C0 / C2). An IoT scenario can be an example.

[0078] Case-3-a: When G=4, P=4, N=5, = 1、L Length When =4, the preamble x on one or more symbols in the i-th symbol group of each preamble repetition unit. i According to Multiplied by sequence w n , where x i It can be a sequence of preambles on one or more symbols in the i-th symbol group within each preamble repetition unit, where i = 1,...,P. The one or more symbols can be symbols starting from the first data symbol in each symbol group, and the preamble can remain unchanged on other symbols. And w n It can be the UE corresponding to L Length The nth sequence selected from the set of sequences. n (i) can be w n The i-th sequence value belonging to the i-th symbol group. Figure 14 An exemplary NPRACH transmission is shown after a partial symbol application sequence across a symbol group within a preamble repetition unit.

[0079] Case-3-b: When G=4, P=4, N=5, = 1、L Length When =4, the preamble x on one or more symbols in the i-th symbol group of each preamble repetition unit. i According to Multiplied by sequence w n , where x iIt can be a sequence of preambles on one or more symbols in the i-th symbol group within each preamble repetition unit, i = 1,...,P. These one or more symbols can be relatively close to the middle of each symbol group. The preamble can remain unchanged on other symbols. And w n It can be the UE corresponding to L Length The nth sequence selected from the set of sequences. n (i) is w n The set of the i-th sequence values ​​belonging to the i-th symbol group. Figure 15 This illustrates the NPRACH transmission following the symbol application sequence across symbol groups within a preamble repetition unit.

[0080] Case-4: The UE can apply a sequence of symbols across preamble repeat groups (e.g., symbols across symbol groups) to the preamble sequence to extend the PRACH capacity. The sequence can be identical across different preamble repeat groups. The sequence can be identical within a symbol group. The symbols in a symbol group can be referred to as the time duration of the sequence unit. The process can be applied to any PRACH format (e.g., NPRACH format 0 / 1 / 2 / 0-a / 1-a, PRACH format 0 / 1 / 2 / 3 / A1 / A2 / A3 / B1 / B2 / B3 / B4 / C0 / C2). An IoT scenario can be an example.

[0081] Case-4-a: When G=4, P=4, N=5, = 2, L Length When =8, the preamble x on one or more symbols in the i-th symbol group of the preamble repetition group. i According to Multiplied by sequence w n , where x i It can be a sequence of preambles on one or more symbols in the i-th symbol group of each preamble repetition group, i=1,...,L Length The one or more symbols can be the symbols starting with the first data symbol in each symbol group. The preamble can remain unchanged on the other symbols. And w n It can be the UE corresponding to L Length The nth orthogonal sequence selected from the set of sequences. n (i) can be w n The i-th sequence belonging to the i-th symbol group. Figure 16 An exemplary NPRACH transmission is shown after a partial symbol application sequence across a symbol group within a preamble repetition unit.

[0082] Case-4-b: When G=4, P=4, N=5, = 2, LLength When =8, the preamble x on one or more symbols in the i-th symbol group of the preamble repetition group. i According to Multiplied by sequence w n , where x i It can be a sequence of preambles on one or more symbols in the i-th symbol group of each preamble repetition group, i = 1,..., L Length The one or more symbols can be relatively close to the center of each symbol group. The preamble can remain unchanged on the other symbols. And w n It can be the UE corresponding to L Length The nth orthogonal sequence selected from the set of sequences. n (i) can be w n The i-th sequence belonging to the i-th symbol group. Figure 17 This illustrates NPRACH transmission following the application of a partial symbol sequence across a symbol group within a preamble repetition unit.

[0083] Case-5: The UE can apply a sequence across a set of symbol groups (e.g., a time-continuous symbol group G, with a defined field G' indicating the number of symbol groups in the symbol group set) within each preamble repetition unit to extend the capacity of the PRACH. The sequence can be identical across different preamble repetition units, and the sequence can be identical within a set of symbol groups (e.g., a set of symbol groups). Symbols in the symbol group set can have the same value applied in the sequence and can be referred to as the time duration of the sequence unit. This process can be applied to any PRACH format (e.g., NPRACH format 0 / 1 / 2 / 0-a / 1-a, PRACH format 0 / 1 / 2 / 3 / A1 / A2 / A3 / B1 / B2 / B3 / B4 / C0 / C2). An IoT scenario can be an example.

[0084] Case-5-a: When G=2, P=4, N=4, = 1、L Length When =2, the preamble x in the i-th symbol group set of the preamble repetition unit i According to Multiplied by sequence w n , where x i It can be the preamble sequence in the i-th symbol group set of each preamble repetition unit, i = 1,...,L Length And w n It can be the UE corresponding to L Length The nth sequence selected from the set of sequences. n (i) can be w nThe i-th sequence belongs to the i-th time continuous symbol group. Figure 18 An exemplary NPRACH transmission is shown after applying a sequence across a set of symbol groups within a preamble repetition unit.

[0085] Case-5-1: The UE can apply a sequence across a set of symbol groups within a preamble repetition unit (e.g., across a set of symbol groups) to the preamble sequence, and the same sequence can be applied to each symbol group within the symbol group set (e.g., a time-continuous symbol group G, and a defined field G' indicating the number of symbol groups in the symbol group set). The sequence can be the same across different preamble repetition units, and the sequence can be the same on each symbol group within the symbol group set. The process can be applied to any PRACH format (e.g., NPRACH format 0 / 1 / 2 / 0-a / 1-a, PRACH format 0 / 1 / 2 / 3 / A1 / A2 / A3 / B1 / B2 / B3 / B4 / C0 / C2). An IoT scenario can be an example.

[0086] Case-5-1-a: When G'=2, P=4, N=4, = 1、L Length When =8, the preamble x in the j-th symbol group of the preamble repetition unit j According to Multiplied by sequence w n (For example, [1 -1 1 -1 -1 1 -11]), where x j It can be the preamble sequence in the j-th symbol group of each preamble repetition unit, j = 1,..., P, and w n It can be the UE corresponding to L Length The nth sequence selected from the set of sequences. n (i) can be w n The set of sequence values ​​belonging to the j-th symbol group (e.g., [1 -1 1 -1] for each symbol group in the first symbol group set, and [-1 1 -1 1] for each symbol group in the second symbol group set), i=1,...,P / G'. That is, the sequence can be divided into P / G' parts for sequence application. Figure 19 An exemplary NPRACH transmission is shown after applying a sequence across a set of symbol groups within a preamble repetition unit.

[0087] Case-6: The UE can apply a sequence across a set of symbol groups (e.g., a time-continuous symbol group G, with a defined field G' indicating the number of symbol groups in the symbol group set) within each preamble repetition group to extend the capacity of the PRACH. The sequence can be identical across different preamble repetition groups and within the symbol group set. Symbols in the symbol group set can have the same value applied to the sequence and can be referred to as the time duration of the sequence unit. This process can be applied to any PRACH format (e.g., NPRACH format 0 / 1 / 2 / 0-a / 1-a, PRACH format 0 / 1 / 2 / 3 / A1 / A2 / A3 / B1 / B2 / B3 / B4 / C0 / C2). An IoT scenario can be an example.

[0088] Case-6-a: When G=2, P=4, N=4, = 2, L Length When =4, the preamble x in the i-th symbol set of the preamble repetition group i According to Multiplied by sequence w n , where x i It can be the preamble sequence in the set of the i-th symbol group in each preamble repetition group, i = 1,..., L Length And w n Is the UE in the corresponding L Length The nth sequence selected from the set of sequences. n (i) can be w n The i-th sequence belongs to the i-th time continuous symbol group. Figure 20 An exemplary NPRACH transmission is shown after applying a sequence across a set of symbol groups within a preamble repetition unit.

[0089] Example 3: The multiplexing can consider sequences that repeat across preambles.

[0090] Case-7: The UE can apply preamble repetition units across repeating groups to the preamble sequence to extend the PRACH capacity. The sequence can be identical across different preamble repetition groups, and the sequence can be identical within a preamble repetition unit. Symbols within the preamble repetition unit can have the same value applied across the sequence and can be referred to as the time duration of the sequence unit. This process can be applied to any PRACH format (e.g., NPRACH format 0 / 1 / 2 / 0-a / 1-a, PRACH format 0 / 1 / 2 / 3 / A1 / A2 / A3 / B1 / B2 / B3 / B4 / C0 / C2).

[0091] Case-7-a: The IoT scenario can be an example, where G=4, P=4, N=5, = 2, L Length When = 2, the preamble x in the i-th preamble repetition unit of the preamble repetition group i According to Multiplied by sequence w n , where x i It can be the preamble sequence in the i-th preamble repetition unit of each preamble repetition group, i = 1,...,L Length And w n Is the UE in the corresponding L Length The nth sequence selected from the set of sequences. n (i) can be w n The set of sequence values ​​belonging to the i-th preamble repetition unit. Figure 21 An exemplary NPRACH transmission is shown after a repeating application sequence within a preamble repeating group.

[0092] Case-7-b: The NR / LTE scenario can be an example. When the PRACH format is 1, the PRACH transmission includes two preamble repetitions, and the sequence length can be equal to the number of repetitions, 2. The preamble x in the i-th preamble repetition within the PRACH transmission... i According to Multiplied by sequence w n , where x i It can be the preamble sequence in the i-th preamble repetition unit of each PRACH transmission, i = 1,..., L Length And w n Is the UE in the corresponding L Length The nth sequence selected from the set of sequences. n (i) can be w n The set of sequence values ​​belonging to the i-th preamble repetition unit. Figure 22 An exemplary PRACH transport is shown after a repeating application sequence within a PRACH transport.

[0093] Case-8: The UE can apply a sequence across repeat groups (e.g., preamble repeat units within a repeat group) to a preamble sequence to extend the capacity of the PRACH. The sequence can be identical within the preamble repeat group. Symbols within the preamble repeat group can have the same value applied in the sequence and can be referred to as the time duration of the sequence unit. This process can be applied to any PRACH format (e.g., NPRACH format 0 / 1 / 2 / 0-a / 1-a, PRACH format 0 / 1 / 2 / 3 / A1 / A2 / A3 / B1 / B2 / B3 / B4 / C0 / C2).

[0094] Case-8-a: The IoT scenario can be an example, where G=4, P=4, N=5, = 4、L Length When the number of repetitions is 2, the repetitions are divided into 2 groups (number of repetitions / L). Length ), the preamble x in the i-th preamble repetition group i According to Multiplied by sequence w n , where x i It can be the preamble sequence in the i-th preamble repetition group, i=1,...,L Length And w n It can be the UE corresponding to L Length The nth sequence selected from the set of sequences. n (i) can be w n The set of sequence values ​​belonging to the i-th preamble repetition group. Figure 23 An exemplary NPRACH transmission is shown after applying a sequence across repeating groups.

[0095] Case-8-b: The NR / LTE scenario can be an example where, when the PRACH format is A2, the PRACH transmission includes four preamble repetitions and the sequence length L. Length If configured as 2, the preamble repetition is divided into 2 repetition groups. The preamble x in the i-th preamble repetition group within the PRACH transmission... i According to Multiplied by sequence w n , where x i It can be the preamble sequence in the i-th preamble repetition group of each PRACH transmission, i = 1,..., L Length And w n Is the UE in the corresponding L Length The nth sequence selected from the set of sequences. n (i) can be w n The set of sequence values ​​belonging to the i-th preamble repetition group. Figure 24 An exemplary PRACH transmission is shown after applying a sequence across repeating groups within a PRACH transmission.

[0096] It should be understood that one or more features from the above / below implementation examples are not exclusive to a particular implementation example, but can be combined in any way (e.g., in any priority and / or order, simultaneously or otherwise).

[0097] Figure 25A flowchart of a method 2500 for performing / enhancing PRACH transmissions is shown. The method 2500 can be used in conjunction with this document. Figures 1 to 24 This can be implemented using any one or more of the detailed components and devices. In general, in some embodiments, method 2500 can be performed by a wireless communication device (e.g., a UE). Depending on the embodiment, additional, fewer, or different operations may be performed in method 2500. At least one aspect of these operations relates to a system, method, apparatus, or computer-readable medium.

[0098] A wireless communication device (e.g., a user equipment (UE)) can determine a resource configuration for performing Physical Random Access Channel (PRACH) transmissions. The resource configuration may include at least one of the following: one or more parameters for the PRACH transmission, or a sequence configuration. The wireless communication device can perform the PRACH transmission according to the resource configuration. In some embodiments, the wireless communication device may receive the resource configuration for performing the PRACH transmission from a wireless communication node (e.g., a base station (BS)). The one or more parameters for the PRACH transmission may include at least one of the following: the format of the PRACH transmission; the number of repetitions indicating multiple repetitions of the PRACH transmission; the number of time-continuous symbol groups; the number of symbol groups in a preamble repetition unit; the number of identical symbols; or the segment length of uplink pre-compensation.

[0099] In some embodiments, the sequence configuration may include an indication of at least one of the following: sequence type; sequence length; sequence number; or sequence index. The sequence type may include at least one of the following: orthogonal covering code or non-orthogonal covering code. The orthogonal covering code may be based on at least one of the following: discrete Fourier transform (DFT) sequence, Walsh sequence, Zadolf-Ju (ZC) sequence, or Hadamard sequence.

[0100] In some embodiments, the sequence length can be determined based on one or more parameters used for the PRACH transmission by at least one of the following: the length of identical symbols in a symbol group, or the total number of symbol groups in a preamble repetition unit multiplied by the number of identical symbols in the symbol group, or the total number of symbol groups in a preamble repetition unit, or the number of repetitions of the Physical Random Access Channel (PRACH) (e.g., attempting to perform a PRACH or NPRACH transmission / procedure), or the total number of symbol groups in the preamble repetition unit multiplied by the number of PRACH repetitions, or the total number of symbol groups in the preamble repetition unit divided by the number of time-continuous symbol groups within the preamble repetition unit, or the total number of symbol groups in the preamble repetition unit multiplied by the size of the preamble repetition unit and then divided by the number of time-continuous symbol groups within the preamble repetition unit. The size of the preamble repetition group can be configured by higher-layer signaling. The size of the preamble repetition group can be equal to the number of PRACH repetitions.

[0101] In some embodiments, the sequence length can be determined based on a first indication configured by higher-layer signaling. The first indication can be at least one of the following: a second indication indicating the sequence length; a third indication indicating the size of the preamble repeat group, wherein the sequence length can be determined by multiplying the total number of symbol groups in the preamble repeat unit by the size of the preamble repeat group; a fourth indication indicating the number of time-continuous symbol groups within the preamble repeat unit, wherein the sequence length can be determined by dividing the total number of symbol groups in the preamble repeat unit by the number of time-continuous symbol groups within the preamble repeat unit; a fifth indication indicating the size of the preamble repeat group; and a sixth indication indicating the number of time-continuous symbol groups within the preamble repeat unit, wherein the sequence length can be determined by multiplying the total number of symbol groups in the preamble repeat unit by the size of the preamble repeat group and then dividing by the number of time-continuous symbol groups within the preamble repeat unit, and a seventh indication indicating both the sequence type and the sequence length. For example, "Type-1" can refer to OCC-2, which can implicitly indicate that the sequence length is 2. "Type-2" can refer to OCC-4, which can implicitly indicate that the sequence length is 4. "Type-3" can refer to OOC-8, which can implicitly indicate that the sequence length is 8. In some embodiments, the sequence number can be determined based on at least one of the following: the sequence length, or higher-layer signaling. The sequence index can be determined based on the user equipment (UE) identifier (ID), or randomly determined by the user equipment (UE).

[0102] In some embodiments, the wireless communication device may determine a set of sequences corresponding to the sequence length. The wireless communication device may determine a specific sequence based on the sequence index and the set of sequences. The wireless communication device may apply the sequence to the PRACH transmission. In some embodiments, applying the sequence may include one or more units for applying the sequence to the PRACH transmission. The one or more units may include at least one of the following: a symbol; a symbol group; a time-continuous symbol group; a preamble repetition unit; or a preamble repetition group.

[0103] In some embodiments, the sequence length indicated in the second or seventh indication may be a specific value. The specific value may correspond to one or more units. In some embodiments, the sequence length indicated in the seventh indication may correspond to one or more units. In some embodiments, the sequence length may be determined based on the segment length for pre-compensation configured by higher-layer signaling.

[0104] In some embodiments, applying the sequence may include using / applying / activating a scheme for applying the sequence. The scheme for applying the sequence may include at least one of the following: applying the sequence by the wireless communication device across one or more symbols within a symbol group, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the symbol group; applying the sequence by the wireless communication device across one or more symbols within a preamble repetition unit, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the preamble repetition unit; applying the sequence by the wireless communication device across one or more symbol groups within a preamble repetition unit, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the preamble repetition unit; applying the sequence by the wireless communication device across one or more symbol groups within a preamble repetition unit, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the preamble repetition unit; applying the sequence by the wireless communication device across one or more sets of symbol groups within a preamble repetition unit, wherein the application may include multiplying each element of the sequence by a corresponding subset of symbols within the preamble repetition unit. Multiply by a corresponding subset of the symbol group set within the preamble repetition unit; apply the sequence by the wireless communication device across one or more symbol group sets within the preamble repetition unit and apply a set of sequences to each symbol group within the symbol group set, wherein the application may include each element of the sequence being multiplied by a corresponding subset of the symbol group set within the preamble repetition unit and a set of sequence elements being multiplied by each symbol group within the symbol group set; apply the sequence by the wireless communication device across one or more symbol group sets within the preamble repetition group, wherein the application may include each element of the sequence being multiplied by a corresponding subset of the symbol group set within the preamble repetition group; apply the sequence by the wireless communication device across one or more preamble repetition units within the repetition group, wherein the application may include each element of the sequence being multiplied by a corresponding subset of the repetition units within the preamble repetition group; or apply the sequence by the wireless communication device across one or more preamble repetition groups, wherein the application may include each element of the sequence being multiplied by a corresponding subset of the preamble repetition group.

[0105] In some embodiments, the sequence can be applied to the PRACH transmission when certain conditions are met. These conditions may include at least one of the following: an eighth indication indicating the application of the sequence to the PRACH transmission; a ninth indication indicating which sequence application scheme to activate; satisfaction of a signal strength-related criterion; satisfaction of a frequency offset-related criterion; satisfaction of a timing offset-related criterion; or satisfaction of a UE mobility state-related criterion. The criteria may include at least one of the following: a measured signal strength (e.g., a reference signal received power (RSRP) or SINR) higher than a first configured threshold; a measured signal strength equal to the first configured threshold; a frequency offset lower than a second configured threshold; a frequency offset equal to the second configured threshold; a timing offset higher than a third configured threshold; a timing offset equal to the third configured threshold; a mobility state higher than a fourth configured threshold; or a mobility state (e.g., UE speed) equal to the fourth configured threshold. If only one threshold is configured, the wireless communication device can use that threshold. If multiple thresholds are configured, the wireless communication device can use at least one of the multiple thresholds (e.g., a minimum threshold, a second minimum threshold, or a maximum threshold).

[0106] In some embodiments, the wireless communication device may determine whether the length of the sequence is associated with one or more thresholds (e.g., if there is only one threshold and the measured signal strength is lower than the first configured threshold, the sequence length is determined to be length-1 (e.g., length-1 can be equal to zero), and if the measured signal strength is higher than the first configured threshold, the sequence length is determined to be length-2; or if there are multiple thresholds and the measured signal strength is higher than the first configured threshold_A, the sequence length is determined to be length-1, and if the measured signal strength is higher than the first configured threshold_B, the sequence length is determined to be length-2; or if there is only one threshold and the frequency offset, timing offset, or movement state is higher than the configured threshold, the sequence length is determined to be length-1 (e.g., length-1 can be equal to zero), and if the frequency offset, timing offset, or movement state is lower than the configured threshold, the sequence length is determined to be length-2; or if there are multiple thresholds, if the frequency offset, timing offset, or movement state is higher than the configured threshold_A, the sequence length is determined to be length-1, and if the frequency offset, timing offset, or movement state is lower than the configured threshold_B, the sequence length is determined to be length-2). In some embodiments, the wireless communication device can determine the segment length based on the sequence length. The wireless communication device can perform uplink (UL) pre-compensation based on the segment length.

[0107] In some embodiments, a wireless communication node (e.g., a base station (BS) or gNB) can receive Physical Random Access Channel (PRACH) transmissions from a wireless communication device (e.g., a UE) according to a resource configuration. The resource configuration can be configured by the wireless communication node. The resource configuration may include at least one of the following: one or more parameters for the PRACH transmission, or a sequence configuration.

[0108] While various embodiments of the present solution have been described above, it should be understood that they are presented by way of example only and not by way of limitation. Similarly, various diagrams may depict exemplary architectures or configurations, provided to enable those skilled in the art to understand the exemplary features and functionality of the present solution. However, those skilled in the art will understand that the present solution is not limited to the exemplary architectures or configurations shown, but can be implemented using various alternative architectures and configurations. Furthermore, as will be understood by those skilled in the art, one or more features of one embodiment may be combined with one or more features of another embodiment described herein. Therefore, the breadth and scope of this disclosure should not be limited by any of the illustrative embodiments described above.

[0109] It should also be understood that the use of designations such as "first" and "second" to refer to elements herein does not generally restrict the number or order of these elements. Rather, these designations may be used herein as a convenient means of distinguishing two or more elements or instances of elements. Therefore, references to first and second elements do not imply that only two elements may be used, or that the first element must somehow precede the second element.

[0110] Furthermore, those skilled in the art will understand that information and signals can be represented using any variety of techniques and methods. For example, data, instructions, commands, information, signals, bits, and symbols that may be referenced in the foregoing description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0111] Those skilled in the art will further understand that any of the various illustrative logic blocks, modules, processors, devices, circuits, methods, and functions described in conjunction with the aspects disclosed herein can be implemented by electronic hardware (e.g., digital implementation, analog implementation, or a combination of both), firmware, various forms of program or design code incorporating instructions (which may be referred to herein as "software" or "software module" for convenience), or any combination of these technologies. To clearly illustrate this interchangeability of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps have been generally described above according to their functionality. Whether such functionality is implemented as hardware, firmware, or software, or a combination of these technologies, depends on the specific application and the design constraints imposed on the system as a whole. Those skilled in the art can implement the described functionality in various ways for each specific application, but such implementation decisions will not depart from the scope of this disclosure.

[0112] Furthermore, those skilled in the art will understand that the various illustrative logic blocks, modules, devices, components, and circuits described herein may be implemented or executed within or by an integrated circuit (IC), which may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, or any combination thereof. The logic blocks, modules, and circuits may further include antennas and / or transceivers for communicating with various components within a network or device. The general-purpose processor may be a microprocessor, but alternatively, it may be any conventional processor, controller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other suitable configuration designed to perform the functions described herein.

[0113] If implemented in software, the functionality can be stored as one or more instructions or code on a computer-readable medium. Therefore, the steps of the methods or algorithms disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media include computer storage media and communication media, including any medium that allows a computer program or code to be transferred from one place to another. Storage media can be any available medium that is accessible to a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that is accessible to a computer.

[0114] In this document, the term "module" refers to software, firmware, hardware, and any combination of these elements used to perform the relevant functions described herein. Furthermore, for the purposes of discussion, the various modules are described as discrete modules; however, as those skilled in the art will understand, two or more modules may be combined according to embodiments of this solution to form a single module performing the relevant functions.

[0115] Furthermore, memory or other storage devices and communication components may be employed in embodiments of this solution. It should be understood that, for clarity, embodiments of this solution have been described above with reference to different functional units and processors. However, it will be apparent that any suitable functional distribution among different functional units, processing logic elements, or domains may be used without departing from this solution. For example, a function shown to be performed by a separate processing logic element or controller may be performed by the same processing logic element or controller. Therefore, references to specific functional units are merely references to suitable means for providing the described functions and do not represent a strict logical or physical structure or organization.

[0116] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the embodiments shown herein, but is to be accorded the broadest scope consistent with the novel features and principles disclosed herein, as set forth in the following claims.

Claims

1. A method comprising: The wireless communication device determines a resource configuration for performing Physical Random Access Channel (PRACH) transmissions, wherein the resource configuration includes at least one of the following: one or more parameters, or a sequence configuration, for the PRACH transmissions; and The PRACH transmission is performed by the wireless communication device according to the resource configuration.

2. The method according to claim 1, comprising: The wireless communication device receives the resource configuration from the wireless communication node for performing the PRACH transmission.

3. The method of claim 1, wherein the one or more parameters used for the PRACH transmission include at least one of the following: The format of the PRACH transmission; Indicates the number of repetitions in the PRACH transmission; The number of consecutive time symbol groups; The number of symbol groups in the preamble repeat unit; The number of identical symbols; or Uplink pre-compensation segment length.

4. The method of claim 1, wherein the sequence configuration includes an indication of at least one of the following: Sequence type; Sequence length; Sequence number; or Sequence index.

5. The method of claim 4, wherein the sequence type includes at least one of the following: orthogonal overlay code or non-orthogonal overlay code.

6. The method of claim 5, wherein the orthogonal covering code is based on at least one of the following: a discrete Fourier transform (DFT) sequence, a Walsh sequence, a Zadolf-Ju (ZC) sequence, or a Hadamard sequence.

7. The method of claim 4, wherein the sequence length is determined based on the one or more parameters used for the PRACH transmission by at least one of the following: The length of identical symbols in a symbol group, or The total number of symbol groups in the preamble repetition unit multiplied by the number of identical symbols in the symbol group, or The total number of symbol groups in the preamble repeat unit, or The number of repetitions in the Physical Random Access Channel (PRACH), or The total number of symbol groups in the preamble repetition unit multiplied by the number of repetitions of the PRACH, or The total number of symbol groups in the preamble repetition unit divided by the number of time-continuous symbol groups within the preamble repetition unit, or The total number of symbol groups in the preamble repetition unit is multiplied by the size of the preamble repetition unit and then divided by the number of time-continuous symbol groups within the preamble repetition unit.

8. The method of claim 4, wherein the sequence length is determined according to a first indication configured by higher-layer signaling, wherein the first indication is at least one of the following: A second indication indicating the length of the sequence; A third indicator indicating the size of the preamble repeat group. The sequence length is determined by multiplying the total number of symbol groups in the preamble repeating unit by the size of the preamble repeating group. A fourth indication indicating the number of time-continuous symbol groups within the preamble repetition unit. The sequence length is determined by dividing the total number of symbol groups in the preamble repetition unit by the number of time-continuous symbol groups within the preamble repetition unit. A fifth indication indicating the size of the preamble repetition group, and a sixth indication indicating the number of time-continuous symbol groups within the preamble repetition unit. The sequence length is determined by multiplying the total number of symbol groups in the preamble repetition unit by the size of the preamble repetition unit and then dividing by the number of time-continuous symbol groups in the preamble repetition unit. A seventh indication that indicates both the sequence type and the sequence length.

9. The method of claim 1 or 3, wherein the number of sequences is determined based on at least one of: sequence length, or higher-layer signaling.

10. The method of claim 1 or 3, wherein the sequence index is determined based on the user equipment (UE) identifier (ID) or is randomly determined by the user equipment (UE).

11. The method according to claim 1 or 8, comprising: The wireless communication device determines a set of sequences corresponding to the sequence length, and The wireless communication device determines a specific sequence based on the sequence index and the sequence set, or The sequence is applied to the PRACH transmission by the wireless communication device.

12. The method of claim 11, wherein applying the sequence comprises applying the sequence to one or more units of a PRACH transmission, wherein the one or more units comprise at least one of the following: symbol; Symbol group; Time-continuous symbol group; Preamble repetition unit; or Preamble repeating group.

13. The method of claim 8, wherein the sequence length indicated in the second or seventh indication is a specific value, wherein the specific value corresponds to one or more units.

14. The method of claim 8, wherein the sequence length indicated in the seventh indication corresponds to one or more units.

15. The method of claim 4, wherein the sequence length is determined based on a segment length configured by higher-layer signaling for pre-compensation.

16. The method of claim 12, wherein applying the sequence comprises using a scheme for applying the sequence, wherein the scheme for applying the sequence comprises at least one of the following: The wireless communication device applies the sequence across one or more symbols within the symbol group. The application described therein includes multiplying each element of the sequence by a corresponding one of the subsets of symbols within the symbol group; The wireless communication device applies the sequence across one or more symbols within the preamble repetition unit. The application mentioned therein includes multiplying each element of the sequence by a corresponding one of the subsets of symbols within the preamble repeating unit; The wireless communication device applies the sequence across one or more symbol groups within the preamble repetition unit. The application mentioned therein includes multiplying each element of the sequence by a corresponding one of the subsets of symbols within the preamble repeating unit; The wireless communication device applies the sequence across one or more symbol groups within a preamble repeat group. The application mentioned therein includes multiplying each element of the sequence by a corresponding one of the subsets of symbols within the preamble repeat group; The wireless communication device applies the sequence across one or more symbol sets within the preamble repetition unit. The application mentioned therein includes multiplying each element of the sequence by a corresponding one of the subsets of the symbol group set within the preamble repeating unit; The wireless communication device applies the sequence across one or more symbol groups within a preamble repetition unit, and a sequence is applied to each symbol group within the symbol group set. The application includes multiplying each element of the sequence by a corresponding one of the subsets of the symbol group set within the preamble repeating unit, and multiplying a set of sequence elements by each symbol group within the symbol group set; The wireless communication device applies the sequence across one or more symbol sets within a preamble repeat group. The application mentioned therein includes multiplying each element of the sequence by a corresponding one of the subsets of the symbol set within the preamble repeat group; The wireless communication device applies one or more preamble repetition units across the repetition group to the sequence. The application mentioned above includes multiplying each element of the sequence by a corresponding one from a subset of the repeating units within the preamble repeat group; or The sequence is applied by the wireless communication device across one or more preamble repetition groups. The application described therein includes multiplying each element of the sequence by a corresponding one from a subset of the preceding code repeating group.

17. The method of claim 16, wherein the sequence is applied to the PRACH transmission when a condition is met, wherein the condition includes at least one of the following: An eighth instruction to apply the sequence to the PRACH transmission; The ninth instruction indicates which sequence application scheme to activate; Meets the standards related to signal strength; Meets the standards related to frequency offset; Meets the criteria related to timing offset; or Meets the standards related to UE mobility state.

18. The method of claim 17, wherein the standard comprises at least one of the following: The measured signal strength is higher than the first configured threshold. The measured signal strength is equal to the first configured threshold; The frequency offset is below the second configuration threshold; The frequency offset is equal to the second configuration threshold; The timing offset is lower than the third configured threshold; The timing offset is equal to the third configuration threshold; The movement status is below the fourth configuration threshold; or The movement status is equal to the fourth configuration threshold.

19. The method according to claim 9 or 10, comprising: The wireless communication device determines whether the sequence length is associated with one or more thresholds.

20. The method of claim 1, comprising: The segment length is determined by the wireless communication device based on the sequence length; or The wireless communication device performs uplink (UL) pre-compensation based on the segment length.

21. A method comprising: The wireless communication node receives Physical Random Access Channel (PRACH) transmissions from the wireless communication device according to resource configuration. The resource configuration is configured by the wireless communication node and includes at least one of the following: one or more parameters for the PRACH transmission, or sequence configuration.

22. A non-transitory computer-readable medium storing instructions that, when executed by at least one processor, cause the at least one processor to perform the method according to any one of claims 1 to 21.

23. An apparatus comprising: At least one processor is configured to perform the method according to any one of claims 1 to 21.

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