Preamble determination method and apparatus, terminal, network side device, and medium

Abstract

The present application relates to the technical field of communications, and discloses a preamble determination method and apparatus, a terminal, a network side device, and a medium. The preamble determination method in embodiments of the present application comprises: a node device configures at least one preamble format for a terminal, wherein the at least one preamble format is used for determining a preamble transmitted on a PRACH; each preamble format among the at least one preamble format comprises at least a first parameter and a second parameter; the first parameter is used for configuring a preamble formed by a first sequence; and the second parameter is used for configuring at least one of the following: a CP mode, a GT mode, a sequence repetition type, a sequence extension scheme, a scrambling scheme for the first sequence, a scrambling scheme for a scrambling sequence, whether the PRACH carries data information, a data-carrying scheme for the PRACH, a payload size indication for data carried in the PRACH, and a specific PRACH.

Description

Methods, devices, terminals, network-side equipment and media for determining preambles

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510492891.5, filed in China on April 18, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of communication technology, specifically relating to a preamble determination method, apparatus, terminal, network-side equipment, and medium. Background Technology

[0004] Currently, during random access, the preamble format of the Physical Random Access Channel (PRACH) is typically generated using only ZC sequences, which can generate 64 preambles.

[0005] Although ZC sequences themselves possess good autocorrelation and constant-amplitude zero autocorrelation characteristics, their performance degrades when resisting large Doppler frequency offsets. For example, in high-speed mobile scenarios such as high-speed rail or drone communications, large Doppler frequency offsets can cause a significant decrease in the correlation of ZC sequences, thereby affecting detection performance, limiting the number of usable preambles, and resulting in lower PRACH transmission efficiency. Summary of the Invention

[0006] This application provides a preamble determination method, apparatus, terminal, network-side device, and medium that can improve the transmission efficiency of PRACH.

[0007] In a first aspect, a preamble determination method is provided, executed by a node device. The method includes: the node device configuring at least one preamble format to a terminal; wherein the at least one preamble format is used to determine the preamble transmitted on the PRACH; each preamble format in the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, a payload size indication for the data carried on the PRACH, and a specific PRACH.

[0008] Secondly, a preamble determination method is provided, executed by a terminal. The method includes: the terminal receiving at least one preamble format configured by a node device; the terminal determining a preamble to be transmitted on a PRACH based on the at least one preamble format; wherein each preamble format in the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure a preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, a payload size indication of the data carried on the PRACH, and a specific PRACH.

[0009] Thirdly, a preamble determination apparatus is provided, the apparatus comprising a first processing module; the first processing module is configured to configure at least one preamble format to a terminal; wherein the at least one preamble format is used to determine the preamble transmitted on the PRACH; each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, the payload size indication of the data carried on the PRACH, and a specific PRACH.

[0010] Fourthly, a preamble determination apparatus is provided, comprising a receiving module and a second processing module; the receiving module is configured to receive at least one preamble format configured by a node device; the second processing module is configured to determine the preamble to be transmitted on the PRACH based on the at least one preamble format; wherein each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is configured to configure the preamble composed of a first sequence; the second parameter is configured to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, the payload size indication of the data carried on the PRACH, and a specific PRACH.

[0011] Fifthly, a preamble determination apparatus is provided, the apparatus being configured to perform the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0012] In a sixth aspect, a terminal is provided, the terminal including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the second aspect.

[0013] In a seventh aspect, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used to receive at least one preamble format configured by a node device; the processor is used to determine a preamble to be transmitted on a PRACH based on the at least one preamble format; wherein each preamble format in the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure a preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, a payload size indication of the data carried on the PRACH, and a specific PRACH.

[0014] Eighthly, a network-side device is provided, the network-side device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first aspect.

[0015] A ninth aspect provides a network-side device, including a processor and a communication interface, wherein the processor is configured to configure at least one preamble format to a terminal; wherein the at least one preamble format is used to determine a preamble transmitted on a PRACH; each preamble format in the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure a preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, a payload size indication of the data carried on the PRACH, and a specific PRACH.

[0016] In a tenth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the second aspect.

[0017] Eleventhly, a wireless communication system is provided, comprising: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the method as described in the second aspect, and the network-side device can be used to perform the steps of the method as described in the first aspect.

[0018] In a twelfth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run a program or instructions to implement the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0019] In a thirteenth aspect, a computer program / program product is provided, which is stored in a storage medium and is executed by at least one processor to implement the steps of the method as described in the first aspect, or to implement the steps of the method as described in the second aspect.

[0020] In this embodiment, the node device can configure at least one preamble format to the terminal; wherein, the at least one preamble format is used to determine the preamble transmitted on the PRACH; each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, the payload size indication of the PRACH carrying data, and a specific PRACH. Through this scheme, since the at least one preamble format configured by the node device to the terminal includes both the first and second parameters, and the preamble format for different scenarios can be flexibly configured using the first and second parameters, the limitation on the number of usable preambles can be avoided, thus improving the transmission efficiency of the PRACH. Attached Figure Description

[0021] Figure 1 is a block diagram of a wireless communication system to which some embodiments of this application may be applied;

[0022] Figure 2 is a flowchart of a preamble determination method provided in some embodiments of this application;

[0023] Figure 3 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0024] Figure 4 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0025] Figure 5 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0026] Figure 6 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0027] Figure 7 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0028] Figure 8 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0029] Figure 9 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0030] Figure 10 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0031] Figure 11 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0032] Figure 12 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0033] Figure 13 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0034] Figure 14 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0035] Figure 15 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0036] Figure 16 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0037] Figure 17 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0038] Figure 18 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0039] Figure 19 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0040] Figure 20 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0041] Figure 21 is a schematic diagram of the preamble format in the preamble determination method provided in some embodiments of this application;

[0042] Figure 22 is a schematic diagram of the mapping method of the preamble format in the preamble determination method provided in some embodiments of this application;

[0043] Figure 23 is a schematic diagram of the mapping method of the preamble format in the preamble determination method provided in some embodiments of this application;

[0044] Figure 24 is a schematic diagram of the mapping method of the preamble format in the preamble determination method provided in some embodiments of this application;

[0045] Figure 25 is a flowchart of a preamble determination method provided in some embodiments of this application;

[0046] Figure 26 is a schematic diagram of the preamble determination device provided in some embodiments of this application;

[0047] Figure 27 is a schematic diagram of the preamble determination device provided in some embodiments of this application;

[0048] Figure 28 is a schematic diagram of a communication device provided in some embodiments of this application;

[0049] Figure 29 is a schematic diagram of the hardware structure of a terminal provided in some embodiments of this application;

[0050] Figure 30 is a schematic diagram of the hardware structure of a network-side device provided in some embodiments of this application. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0052] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, the scope of protection for "A or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. In addition, the terms "A and / or B," "at least one of A and B," and "at least one of A or B" also cover at least the above three scenarios. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0053] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as the sender explicitly informing the receiver of specific information, the required operation, or the requested result in the instruction sent. An indirect instruction can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the required operation or requested result based on the judgment result.

[0054] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), or other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0055] Figure 1 shows a block diagram of a wireless communication system applicable to an embodiment of this application. The wireless communication system includes a terminal 11 and a node device 12. The terminal 11 can also be referred to as User Equipment (UE), and can be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipboard equipment, pedestrian user equipment (PUE), smart home (home devices with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM, or self-service machine, etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among these, in-vehicle devices can also be referred to as in-vehicle terminals, in-vehicle controllers, in-vehicle modules, in-vehicle components, in-vehicle chips, or in-vehicle units, etc. It should be noted that the specific type of terminal 11 is not limited in this application embodiment. Node device 12 may include access network equipment or core network equipment, wherein access network equipment may also be referred to as Radio Access Network (RAN) equipment, radio access network function, or radio access network unit. Access network equipment may include base stations, Wireless Local Area Network (WLAN) access points (APs), or Wireless Fidelity (WiFi) nodes, etc.Among them, base stations can be referred to as Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio Node B (NR Node B), Access Point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B, Transmit / Receive Point (TRP), Non-Terrestrial Network (NTN) equipment (such as satellite or high altitude platform stations). The term "base station" can be any suitable term in the field, such as "station" or any other appropriate term in the relevant field, as long as the same technical effect is achieved. The term "base station" is not limited to specific technical terms. It should be noted that the embodiments of this application only use the base station in the NR system as an example for introduction, and do not limit the specific type of base station.

[0056] Core network equipment, also known as core network nodes, core network functions, or core network elements, includes, but is not limited to, at least one of the following: Mobility Management Entity (MME), Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Server Discovery Function (EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (L-NEF), and Binding Support. Functions include BSF, Application Function (AF), Location Management Function (LMF), Gateway Mobile Location Centre (GMLC), Network Data Analytics Function (NWDAF), and Non-Terrestrial Network (NTN) equipment (such as satellite or high altitude platform station).It should be noted that the embodiments of this application only use the core network equipment in the NR system as an example for introduction, and do not limit the specific type of core network equipment. If the name of the core network equipment mentioned in the embodiments of this application changes in subsequent protocol versions (e.g., 6G), it is also within the scope of protection of this application.

[0057] Optionally, the core network equipment can be implemented by one or more functional modules in a single device, or by multiple devices working together; this application does not specifically limit this. It is understood that the aforementioned functional modules can be network elements in hardware devices, software functional modules running on dedicated hardware, or virtualized functional modules instantiated on a platform (e.g., a cloud platform).

[0058] The following explains some concepts and terms involved in the preamble determination method, apparatus, terminal, network-side equipment and medium provided in the embodiments of this application.

[0059] sequence

[0060] A sequence is an ordered set of numbers obtained by sampling a signal at discrete points in time. These sequences are used to represent the sample values ​​of the signal at different points in time.

[0061] Random Access

[0062] I. Random Access Resource Selection

[0063] In related technologies, the random access procedure can be either a contention-based or non-contention-based random access procedure. The random access procedure can be a 4-step random access procedure (also known as a Type-1 random access procedure) or a 2-step random access procedure (also known as a Type-2 random access procedure).

[0064] In a contention-based 4-step random access process, the terminal first sends Msg1 to the network, containing a preamble. Upon detecting the preamble, the network sends Msg2 or a Random Access Response (RAR) message, containing the preamble number detected by the network and the uplink radio resources allocated to the terminal for sending msg3. Upon receiving Msg2, the terminal confirms that at least one of the preamble numbers carried in Msg2 matches the number of its own preamble. Then, according to the resources indicated in the RAR message, the terminal sends msg3 containing contention resolution information. Upon receiving Msg3, the network sends Msg4 containing contention resolution information. Upon receiving Msg4, the terminal confirms that the contention resolution information matches the information it sent in Msg3, thus completing the 4-step random access process.

[0065] The network includes uplink grant information in the RAR message to indicate MSG3 Physical Uplink Shared Channel (PUSCH) scheduling information, and also includes information such as the Random Access Channel preamble ID (RAPID), Temporary Cell (TC) - Radio Network Temporary Identity (RNTI), and Tracking Area (TA). If the network does not receive the MSG3 PUSCH, it can schedule a retransmission of the MSG3 PUSCH in the TC-RNTI scrambled Physical Downlink Control Channel (PDCCH).

[0066] For contention-based random access procedures, different terminals randomly select a preamble for transmission, which is transmitted or carried on the Physical Random Access Channel (PRACH). Different terminals may select the same preamble for transmission on the same time-frequency radio resources, a situation known as preamble conflict. In this case, different terminals will receive the same RAR (Registered Access Request). At this point, different terminals will transmit the MSG3 PUSCH according to the scheduling information in the RAR UL grant. The network can only resolve one PUSCH transmitted by one terminal on a single MSG3 PUSCH scheduling resource. This PUSCH contains contention resolution information; therefore, the network will include the contention resolution information received in MSG3 in MSG4. If the contention resolution information received by the terminal in MSG4 matches the contention resolution information transmitted by the terminal in MSG3 PUSCH, the terminal considers the contention resolution successful. If they do not match, the contention resolution is considered unsuccessful. If the contention resolution is unsuccessful, the terminal reselects a random access channel transmission resource, transmits the PRACH, and initiates another random access attempt.

[0067] For a two-step random access procedure, the first step is for the terminal to send MsgA to the network. Upon receiving MsgA, the network sends MsgB to the terminal. If the terminal does not receive MsgB within a certain time, it increments a counter counting the number of MsgA transmissions and retransmits MsgA. If the counter reaches a certain threshold, the terminal switches from a two-step random access procedure to a four-step random access procedure. MsgA includes a MsgA preamble and a MsgA PUSCH. The preamble is transmitted on the Physical Random Access Channel (PRACH) transmission occasion (RO) used for the two-step random access channel. The PUSCH is transmitted on the MsgA PUSCH resources associated with the MsgA preamble and RO. The MsgA PUSCH resources are a set of PUSCH resources configured for each PRACH slot, including time-frequency resources and Demodulation Reference Signal (DMRS) resources.

[0068] II. Selection of Random Access Resources and Mapping of Synchronization Signal Block (SSB) to RO

[0069] Currently, a cell can configure multiple Frequency Division Multiplexing (FDM) ROs at a single time-domain location of a transmission PRACH. At any given time, the number of FDM ROs that can be used can be {1, 2, 4, 8}. At any given time, there are 8 RO resources distributed across different frequencies.

[0070] The random access preamble can only be transmitted on the time-domain resources configured by the parameter PRACHConfigurationIndex, and on the frequency-domain resources configured by the parameter PRACH-FDM. The PRACH frequency-domain resources belong to {0, 1, ..., M-1}, where M equals the higher-layer parameter PRACH-FDM. During initial access, the PRACH frequency-domain resources are numbered in ascending order starting from the lowest-frequency RO resource within the initial active uplink bandwidth part; otherwise, they are numbered in ascending order starting from the lowest-frequency RO resource within the active uplink bandwidth part.

[0071] There is a correlation between the RO (Redirect Base) and the actual SSB (Secure Subsystem). One SSB may be associated with multiple ROs, or multiple SSBs may be associated with one RO. When multiple SSBs are associated with one RO, different SSBs correspond to different Preamble codes. Typically, the base station can use different beams to transmit different SSBs. The corresponding terminal transmits the Preamble on the RO associated with the SSB. Based on the strength of the received downlink beam or SSB, the terminal selects the RO associated with the SSB with the best signal, or a "RO and Preamble combination," and transmits Msg1. In this way, the network can determine the SSB selected by the terminal based on the received Preamble's RO or "RO and Preamble combination," and transmit Msg2 on the downlink beam corresponding to the SSB to ensure the quality of downlink signal reception.

[0072] The preamble determination method, apparatus, terminal, network-side equipment, and medium provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0073] The preamble determination method provided in this application can be applied to the preamble determination process in scenarios such as enhanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC), or massive machine-type communication (mMTC).

[0074] For example, a node device can configure at least one preamble format to a terminal; wherein, the at least one preamble format is used to determine the preamble transmitted on the PRACH; each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the way the PRACH carries data, the payload size indication of the PRACH carrying data, and a specific PRACH.

[0075] Thus, since at least one preamble format configured by the node device to the terminal includes a first parameter and a second parameter, and the preamble format for different scenarios can be flexibly configured through the first parameter and the second parameter, the limitation on the number of usable preambles can be avoided, thereby improving the transmission efficiency of PRACH.

[0076] Furthermore, the ability of the preamble to resist Doppler frequency offset and the capacity of the preamble can be improved in high-speed scenarios or non-terrestrial network (NTN) scenarios.

[0077] This application provides a preamble determination method. Figure 2 shows a flowchart of a preamble determination method provided in some embodiments of this application. As shown in Figure 2, the preamble determination method provided in some embodiments of this application may include the following step 201.

[0078] Step 201: The node device configures at least one preamble format to the terminal.

[0079] Wherein, the above-mentioned at least one preamble format is used to determine the preamble transmitted on PRACH; each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether PRACH carries data information, the way PRACH carries data, the payload size indication of PRACH carrying data, and a specific PRACH.

[0080] Optionally, in the embodiments of this application, the node device may be a base station, a network, a reconfigurable intelligence surface (or intelligent reflection surface), a repeater (or relay), a satellite, or a transmission and reception point (TRP), etc.

[0081] Optionally, in this embodiment, the terminal may be a mobile phone, smartwatch, helmet, customer premise equipment (CPE), a tagged object, or a reduced capability device, etc.

[0082] Optionally, in this embodiment of the application, the node device can configure at least one of the above-mentioned preamble formats to the terminal through higher-layer signaling or protocol predefinition.

[0083] Optionally, in embodiments of this application, the first sequence may include at least one of the ZC sequence, the m sequence (longest linear feedback shift register sequence), and the gold sequence.

[0084] Optionally, in the embodiments of this application, the first parameter may be used to configure at least one of the sequence length, subcarrier spacing, and waveform of the first sequence.

[0085] Optionally, in the embodiments of this application, the sequence length may include any possible sequence length such as 139 or 839.

[0086] Optionally, in the embodiments of this application, the subcarrier spacing may include any possible subcarrier spacing such as 1.25KHz, 1.25KHz, 1.25KHz, or 1.25KHz.

[0087] Optionally, in the embodiments of this application, the above waveform may include any possible waveform such as an orthogonal frequency division multiplexing (OFDM) waveform or an on-off keying (OOK) waveform.

[0088] Optionally, in the embodiments of this application, different preamble formats in the above-mentioned at least one preamble format may correspond to different waveforms.

[0089] Optionally, in the embodiments of this application, the at least one preamble format can be further encoded.

[0090] In this embodiment of the application, since the first parameter can be specifically used to configure at least one of the sequence length, subcarrier spacing and waveform of the first sequence, that is, each of the above preamble formats can include parameters for configuring at least one of the sequence length, subcarrier spacing and waveform of the first sequence, the flexibility of configuring the preamble format can be improved.

[0091] Optionally, in the embodiments of this application, the above-mentioned Cyclic Prefix (CP) mode may include any of the following: a mode in which a CP exists before each sequence in a preamble format, a mode in which a CP exists only before the first sequence in a preamble format, and a mode in which no CP exists in a preamble format.

[0092] Optionally, in the embodiments of this application, the first sequence may be composed of one of the first sequences, for example, the first sequence may be composed of a ZC sequence or an m sequence, etc.

[0093] Optionally, in the embodiments of this application, the power-saving device can predefine whether a CP exists in a preamble format through higher-layer signaling configuration or protocol, or it can predefine the above-mentioned CP mode through higher-layer signaling configuration or protocol.

[0094] It should be noted that CP can be used to combat inter-symbol interference and subcarrier orthogonality disruption caused by multipath delay, and improve receiver detection performance, but excessive CP will increase overhead.

[0095] In this embodiment of the application, since the above-mentioned CP mode may include any of the following: a mode in which a CP exists before each sequence in a preamble format, a mode in which a CP exists only before the first sequence in a preamble format, and a mode in which no CP exists in a preamble format, each of the above preamble formats can be configured with different CP modes, thereby further improving the flexibility of configuring the preamble format.

[0096] Optionally, in the embodiments of this application, the above-mentioned Guard Time (GT) mode may include any of the following: a mode in which GT exists after each sequence in a preamble format, a mode in which GT exists only after the last sequence in a preamble format, and a mode in which GT does not exist in a preamble format.

[0097] Optionally, in the embodiments of this application, the last sequence can be composed of one of the first sequences, for example, the last sequence can be composed of a ZC sequence or an m sequence, etc.

[0098] Optionally, in the embodiments of this application, the power-saving device can predefine whether a GT exists in a preamble format through higher-layer signaling configuration or protocol, or it can predefine the above-mentioned GT mode through higher-layer signaling configuration or protocol.

[0099] It should be noted that GT can be used to provide protection against multipath interference and reduce interference with the preamble of other users.

[0100] In this embodiment of the application, since the above-mentioned GT mode may include any of the following: a mode in which a GT exists after each sequence in a preamble format, a mode in which a GT exists only after the last sequence in a preamble format, and a mode in which a GT does not exist in a preamble format, each of the above preamble formats can be configured with different GT modes, thereby further improving the flexibility of configuring the preamble format.

[0101] For example, as shown in Figure 3, a preamble format consists of multiple sequences, CP, and GT, each of which is composed of a first sequence. The device can use a preamble based on a preamble format and send the preamble on RO resources for random access.

[0102] For example, a preamble format comprises multiple sequences, a CP, and a GT, where each of the multiple sequences is composed of a first sequence. Specifically, as shown in Figure 4, in a preamble format, each of the multiple sequences is preceded by a CP, and only the last sequence is followed by a GT; as shown in Figure 5, in a preamble format, only the first of the multiple sequences is preceded by a CP, and only the last sequence is followed by a GT; as shown in Figure 6, in a preamble format, there is no CP, and only the last sequence is followed by a GT.

[0103] It should be noted that the preamble format shown in Figure 4 or Figure 5 above has the following characteristics:

[0104] 1. For the preamble format with CP inserted at the beginning, resource utilization efficiency is the highest;

[0105] 2. A preamble of the same length can carry more Random Access Channel (RACH) sequences, which is beneficial for supporting high coverage scenarios and base station beam sweeping.

[0106] 3. Continuously transmitted RACH sequences are beneficial for generating continuous preamble waveforms, which is helpful for detection;

[0107] 4. The preamble format with CP inserted in the header has less CP overhead, which is more conducive to using larger CP and GT;

[0108] 5. It is beneficial for supporting ultra-large zoning areas;

[0109] 6. Repeated sequences are helpful for base station detection; for example, adjacent RACH sequences can provide CP functionality.

[0110] The preamble format shown in Figure 6 above has the following characteristics: it saves CP overhead, and repeating sequences help base station detection; for example, adjacent RACH sequences can provide CP functionality. Optionally, the number of times a sequence appears can be configured, indicated, or predefined in a similar way.

[0111] Optionally, in this embodiment of the application, the above-mentioned sequence repetition type is used to determine a group of repeating sequences in a preamble;

[0112] The aforementioned repeating sequence group includes any one of the following:

[0113] Sequences generated from the same root index;

[0114] A sequence generated by cyclic shifting the same root index;

[0115] The first repeating subsequence generated from the same root index, and the multiple conjugate sequence of the first repeating subsequence;

[0116] The second repeating subsequence generated by cyclic shifting the same root index, and the complex conjugate sequence of the second repeating subsequence;

[0117] Sequences generated from different root indices;

[0118] A sequence generated by cyclic shifting of different root indices.

[0119] Optionally, in the embodiments of this application, the above-mentioned sequence repetition types can be divided into identical sequence repetition types and different sequence repetition types.

[0120] In this context, "identical sequence" refers to a sequence generated from the same root sequence and / or its cyclic shifts. "Different sequence" refers to a sequence generated from different root sequences or different cyclic shifts of the same root sequence, and also includes sequences generated from different cyclic shifts of different root sequences.

[0121] Optionally, in the embodiments of this application, the first repeating subsequence may be composed of one of the first sequences, for example, the first repeating subsequence may be composed of a ZC sequence or an m sequence, etc.

[0122] Optionally, in the embodiments of this application, the second repeating subsequence may be composed of one of the sequences in the first sequence, for example, the second repeating subsequence may be composed of a ZC sequence or an m sequence, etc.

[0123] For example, as shown in Figure 7, a repeating sequence group in a preamble includes sequences generated by the same root index, or sequences generated by cyclic shifts of the same root index; where j is greater than or equal to 0, and when j = 0 there is no cyclic shift, which is the root index u. As shown in Figure 8, a repeating sequence group in a preamble includes a first repeating subsequence generated by the same root index and its complex conjugate sequence, or includes a second repeating subsequence generated by cyclic shifts of the same root index and its complex conjugate sequence; where j is greater than or equal to 0, and when j = 0 there is no cyclic shift, which is the root index u. As shown in Figure 9, a repeating sequence group in a preamble includes sequences generated by different root indices, or sequences generated by cyclic shifts of different root indices; where j and m are greater than or equal to 0, and when j or m = 0, it is the root index u or k. When u = k, j ≠ m; when u ≠ k, j can be equal to m.

[0124] It should be noted that the preamble format shown in Figure 8 above has the following characteristics: The transceiver implementation is relatively simple. Multiple sequences can be used for joint detection, and detection performance can be improved through diversity gain. Multiple sequences can be merged in the frequency or time domain to resist the influence of Doppler frequency offset. The preamble format shown in Figure 9 above has the following characteristics: Merging different sequences can carry more information.

[0125] Optionally, in the embodiments of this application, the different sequences mentioned above may be composed of different sequences in the first sequence.

[0126] For example, as shown in Figure 10, the first sequence uses the ZC sequence, and the second sequence uses the m sequence.

[0127] In this embodiment of the application, since the above sequence repetition type may include any one of 1.1 to 1.3 above, different sequence repetition types can be used when configuring each of the above preamble formats, thereby further improving the flexibility of configuring the preamble format and facilitating the carrying of more information.

[0128] Optionally, in the embodiments of this application, the above sequence expansion method may include any of the following: an expansion method with orthogonal covering codes (OCC), or an expansion method without OCC.

[0129] Optionally, in this embodiment of the application, the aforementioned OCC may be configured, indicated, or predefined by the node device.

[0130] For example, as shown in Figure 11, sequence expansion methods include expansion methods with existing OCCs. The OCC can be configured, indicated, or predefined by the node. For instance, for a sequence of length 2, OCC N can include two OCC values: OCC 1 is [1,1], and OCC 2 is [1,-1]. Figures 12, 13, and 14 show expansion methods for sequences with an OCC length of 4. It can be seen that the expansion methods can be [1 1 1 1], [1 -1 1 -1] and [1 -1 -1 1], [1 1 -1 -1]. Different preamble formats can be applied to different scenarios. For example, a terrestrial network (TN) scenario uses one preamble format, while an NTN scenario uses another.

[0131] In this embodiment of the application, since the above sequence extension method may include an extension method with OCC or an extension method without OCC, different sequence extension methods can be adopted when configuring each of the above preamble formats, thereby further improving the flexibility and capacity of configuring the preamble format.

[0132] Optionally, in the embodiments of this application, the scrambling method of the first sequence may include any one of the following: a scrambling method with a scrambling sequence, or a scrambling method without a scrambling sequence.

[0133] Optionally, in the embodiments of this application, the above scrambling sequence may be configured, indicated, or predefined by the node device.

[0134] Optionally, in this embodiment of the application, when the scrambling method of the first sequence includes a scrambling method of the scrambling sequence, the terminal can perform random access through the preamble formed by the first sequence.

[0135] Optionally, in this embodiment, when the scrambling method of the first sequence includes the scrambling method of the unscrambled sequence, the first sequence can be scrambled to obtain the target sequence, and the terminal performs random access using the preamble formed by the target sequence. The scrambling sequence is configured or indicated by the node or predefined in the protocol.

[0136] Optionally, in the embodiments of this application, the scrambling sequence may include at least one of the following: ZC sequence, m sequence, gold sequence, and other sequences.

[0137] It should be noted that in a preamble, the same first sequence and scrambling sequence cannot usually be used; that is, the first sequence and the scrambling sequence must be different.

[0138] For example, when a scrambling sequence constitutes a preamble, for at least one sequence in the preamble, its structure is formed by scrambling a first sequence with a scrambling sequence. This can be adapted to different application scenarios (e.g., TN, NTN, LPWA scenarios), and can be used to provide higher capacity, combat Doppler shift in high-speed scenarios, and estimate time offset. As shown in Figures 15 and 16, the first sequence is a ZC sequence; the scrambling sequence is a PN sequence, such as an m-sequence or a gold sequence, which can also be called a scrambling code sequence.

[0139] It should be noted that scrambling with a pseudo-random sequence can disperse the energy diffusion caused by Doppler frequency offset, reduce the detection probability of spurious peaks, and mitigate the impact of frequency offset on detection performance. The scrambled signal is smoother in the frequency domain and can resist spectral distortion caused by frequency offset to a certain extent.

[0140] Optionally, in the embodiments of this application, the scrambling method of the above scrambling sequence may include any of the following: uniform scrambling, non-uniform scrambling, and full scrambling.

[0141] For example, as shown in Figure 17, the scrambling method is uniform scrambling method 1-1; as shown in Figure 18, the scrambling method is uniform scrambling method 1-2; as shown in Figure 19, the scrambling method is non-uniform scrambling method 2-1; as shown in Figure 20, the scrambling method is non-uniform scrambling method 2-2; and as shown in Figure 21, the scrambling method is full scrambling. The sequential scrambling method can increase the preamble capacity and reduce the detection complexity.

[0142] In this embodiment of the application, since the scrambling method of the first sequence can include a scrambling method with a scrambling sequence or a scrambling method without a scrambling sequence, different scrambling methods can be used when configuring each of the preamble formats, thereby further improving the flexibility of configuring the preamble format.

[0143] For example, an m-sequence is a pseudo-random binary sequence generated by a linear feedback shift register (LFSR). The generation of an m-sequence depends on a primitive polynomial. An example of the primitive polynomial for an m-sequence is x. 10 +x 3 +1. The initial state can be set as: [x(9)x(8)x(7)x(6)x(5)x(4)x(3)x(2)x(1)x(0)]=[1,1,0,0,1,0,0,0,0,0]. The advantages and disadvantages of m-sequences are good pseudo-randomness, simple generation method, good autocorrelation characteristics, easy to replicate and detect, strong anti-interference ability, and wide application in communication, radar, encryption and other fields. However, the number of sequences is limited, and the cross-correlation between sequences is not always good.

[0144] An example of a pseudo-random sequence can be defined by a Gold sequence of order 31, with length M. PN Output the sequence c(n), where n = 0, 1, ..., M PN -1 can be defined as follows: c(n) = (x1(n+N) C )+x2(n+N C ))mod 2 x1(n+31)=(x1(n+3)+x1(n))mod 2 x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod 2;

[0145] Where N C =1600, the first m-sequence x1(n) is initialized as x1(0) = 1, x1(n) = 0, n = 1, 2, ..., 30. The second m-sequence x2(n) is initialized using... This indicates that its value depends on the application of the sequence.

[0146] For the sequence described above, the generated sequence can be truncated from the most significant bit (MSB) to the length of the first sequence A. For example, a length of 839 or 139. Optionally, other lengths can be defined, such as 2. 10 The length sequence is truncated to 839.

[0147] Gold sequences can provide a greater number of sequences and good cross-correlation, but their sequence length is limited, their generation complexity is slightly higher than that of m sequences, and their autocorrelation properties are slightly inferior to those of m sequences.

[0148] For the scrambling sequence or the initial sequence of the scrambling sequence, a target ID can be considered. For example, the target ID can be cell ID1 (0-2), cell ID2 (0-335), the configured ID, or the radio frame number, etc.

[0149] A ZC sequence is a complex pseudo-random sequence consisting of a root index u and a sequence length L. RA The ZC sequence is uniquely determined. It is characterized by perfect autocorrelation, good cross-correlation, low peak-to-average power ratio, flexible sequence length, and strong resistance to frequency offset. However, it has high generation complexity, is sensitive to root index and cyclic shift, and has a limited number of sequences.

[0150] Taking the first sequence as a ZC sequence as an example, the preamble set x is randomly accessed. u，v (n) Produced based on the ZC sequence. The preamble design transmitted on PRACH uses a predefined sequence scrambling ZC sequence in the frequency domain, and merges the original ZC sequence, with the m-th sequence F... m (k), m = 1, 2, ..., N;

[0151] For sequence scrambling: F m (k)=y u,v (k)·G(k);

[0152] An example of a scrambling method is shown below:

[0153] Wherein, G(k) is the m sequence or gold sequence in the above embodiments.

[0154] Optionally, in the embodiments of this application, whether the PRACH carries data information may include: the PRACH carries data information or the PRACH does not carry data information.

[0155] Optionally, in the embodiments of this application, the way the PRACH carries data may include any of the following: a way carried by a sequence, or a way carried by payload information.

[0156] For example, taking the above-mentioned method of carrying data via PRACH as an example, which includes carrying data via preamble sequences, multiple sequences can be configured to carry information through different sequence combinations.

[0157] For example, taking the above-mentioned PRACH data carrying method as an example, which includes the method of carrying data by payload information, a channel carrying payload information can be connected after the preamble, and the data is carried by the payload information.

[0158] Optionally, in the embodiments of this application, the payload size indicator of the PRACH carrying data can be used to indicate any of the following: the payload size of the PRACH carrying data is greater than or not less than a first threshold, or the payload size of the PRACH carrying data is less than or not greater than a first threshold.

[0159] Specifically, if the payload size of the PRACH is greater than or equal to a first threshold, it is classified as one preamble format; otherwise, it is classified as another preamble format. Optionally, it can be extended to support more thresholds, thereby dividing multiple payload ranges (intervals).

[0160] For example, the preamble format can be indicated by the above parameters through a table, for instance, an indication of format D1 is predefined in the protocol as shown in Table 1 below:

[0161] Table 1

[0162] The parameters in Table 1 above, and any other parameters that may be required, can be indicated by other higher-level configuration signaling. u represents the subcarrier spacing.

[0163] Optionally, in this embodiment, the aforementioned specific PRACH can be a PRACH on a reserved frequency band, a reserved sub-frequency band, or a reserved carrier. The preamble transmitted on this PRACH is a preamble of a specific format.

[0164] The reserved frequency band, the reserved sub-frequency band, or the reserved carrier mentioned above are resources dedicated to the specific PRACH transmissions mentioned above.

[0165] For example, assuming that the specific PRACH mentioned above includes a first PRACH and a second PRACH, then:

[0166] First PRACH: A specific PRACH is transmitted on a specific reserved frequency band, reserved sub-band, or reserved carrier, on which a specific preamble format is transmitted, such as carrying a WUS signal;

[0167] Second PRACH: Transmitting a second PRACH and other channels / signals on another specific reserved frequency band, reserved sub-band, or reserved carrier. This PRACH transmits a preamble in a specific preamble format, where the second PRACH signal can be a 4G or 5G PRACH. The first and second PRACHs can carry preambles based on different preamble formats.

[0168] In this embodiment, since the specific PRACH can be a PRACH on a reserved frequency band, a reserved sub-frequency band, or a reserved carrier, the flexibility of the preamble format configuration can be further improved.

[0169] Optionally, in the embodiments of this application, step 201 above can be specifically implemented by step 201a below.

[0170] Step 201a: The node device configures at least one preamble format to the terminal based on the first information.

[0171] The first piece of information includes at least one of the following:

[0172] An RO mapped to a reference signal uses a preamble format.

[0173] Different ROs mapped to a reference signal use a preamble format.

[0174] For at least some of the different ROs within a group of ROs mapped to at least one reference signal, different preamble formats are used;

[0175] Different preamble formats are used for ROs in different RO groups that are mapped to at least one reference signal;

[0176] For at least some of the multiple ROs mapped to at least one reference signal, different preamble formats are used, and the multiple ROs are all of different symbol types;

[0177] Different preamble groups associated with the same reference signal use different preamble formats;

[0178] Different preamble formats are used for different preamble groups associated with different reference signals or different reference signal groups.

[0179] Guard band mode mapped to multiple ROs of at least one reference signal;

[0180] Preamble format configuration information.

[0181] Optionally, in the embodiments of this application, the preamble format used by one or more ROs mapped to a reference signal may include one or more preamble formats.

[0182] Optionally, in the embodiments of this application, the ROs that are mapped to the same or different RO groups of at least one reference signal can use the same preamble format.

[0183] Optionally, in this embodiment of the application, different preamble formats are used for ROs mapped to different RO groups of at least one reference signal, while ROs within each RO group mapped to the at least one reference signal can use the same preamble format.

[0184] Optionally, in the embodiments of this application, the at least some different ROs within a group of ROs mapped to at least one reference signal may include some or all different ROs within the group of ROs.

[0185] For example, if an RO group includes RO1, RO2, RO3 and RO4, and any two of RO1, RO2, RO3 and RO4 are different, then at least some of the different ROs in the RO group may include RO1 and RO2, or RO1, RO2 and RO3, or RO1, RO2, RO3 and RO4, etc.

[0186] Optionally, in the embodiments of this application, at least some of the ROs among the plurality of ROs mapped to at least one reference signal may include some or all of the plurality of ROs.

[0187] For example, if the above-mentioned multiple ROs include RO5, RO6 and RO7, then at least some of the multiple ROs may include RO5, or include RO5 and RO6, or include RO5, RO6 and RO7, etc.

[0188] Optionally, in the embodiments of this application, the above-mentioned GB mode includes a mode with GB present or a mode without GB present.

[0189] Optionally, in this embodiment of the application, the presence of GB can be configured with one preamble format, while the absence of GB can be configured with another preamble format.

[0190] For example, whether there is a guard band in the frequency domain between two adjacent ROs or between RO groups can be configured or predefined. The motivation for configurable preamble formats is that preambles within different ROs in high-frequency biased scenarios may interfere with each other. Selecting different preamble formats can reduce interference between preamble formats, thereby improving the detection performance of nodes.

[0191] It should be noted that for a PRACH transmission with N preamble repetitions, a group or set is formed by N valid ROs. These N ROs are temporally consecutive and use the same frequency resources, are associated with the same one or more downlink reference signal indices, such as SSB indices, and each downlink reference signal index is associated with the same preamble index on all valid ROs within the group or set.

[0192] For example, as shown in Figure 22, a node device can be configured to have more than one preamble format within a single RO mapped to a reference signal. Here, preamble format A can be a first sequence A, and preamble format B can be a scrambling sequence or an OCC sequence of the first sequence A. Some examples are as follows: As shown in Figure 23, a node device can be configured to have one preamble format within an RO mapped to a reference signal; for example, SSB1 is mapped to two ROs, RO1 and RO2. As shown in Figure 24, a node device can be configured to have more than one preamble format within an RO mapped to a reference signal; using different preamble formats can improve capacity.

[0193] For example, a node device can be configured to use different preamble formats for different RO groups. For instance, for an RO group with a preamble repetition count of 2, preamble format 1 can be configured; for an RO group with a preamble repetition count of 8, preamble format 2 can be configured. The advantage of this is that for scenarios with a high number of repetitions, a higher preamble capacity may be required, making the use of different preamble formats beneficial. Furthermore, a node device can be configured to use different preamble formats within a single RO group.

[0194] Nodes can be configured to use different preamble formats for ROs of different symbol types. For example, preamble format 1 can be used for ROs of SBFD symbol type, while preamble format 2 can be used for ROs of Non-SBFD symbol type. The advantage of this is that different preamble formats may have different levels of interference tolerance, which is beneficial for using different preamble formats according to different interference scenarios.

[0195] For example, different preamble groups associated with the same reference signal can be configured with different preamble formats. For instance, two preamble groups associated with SSB0: Group A and Group B. Group A supports repeated transmissions within OCC and RO, thus supporting greater capacity. Group B does not support OCC, only repeated transmissions, primarily used to meet the high-reliability random access requirements of a small number of users.

[0196] Different preamble formats can be configured for association with different reference signals or different reference signal groups. For example, the channel resources for transmitting the preamble in two signal groups SSB group A {SSB0, SSB1} and SSB group B {SSB2, SSB3} can be PRACH resource group A and PRACH resource group B, respectively. PRACH resource group A supports OCC and repeated transmission, thus supporting greater capacity. PRACH resource group B does not support OCC, only repeated transmission, and is mainly used to meet the high-reliability random access requirements of a small number of users.

[0197] In this embodiment of the application, since the node device can configure at least one preamble format to the terminal based on the first information, at least one preamble format can be configured based on the mapping information related to the preamble format, thereby improving the accuracy of configuring the preamble format.

[0198] Optionally, in this embodiment of the application, the preamble format configuration information can be determined according to at least one of the following 2.1 to 2.10:

[0199] 2.1 Time-frequency resource types for PRACH transmission;

[0200] 2.2 Is the PRACH resource configured on demand?

[0201] 2.3. PRACH is requested or activated by the terminal;

[0202] 2.4. PRACH is activated by network dynamic indication or via a downlink wake-up signal (WUS);

[0203] 2.5. Is the preamble signal used as the WUS signal?

[0204] 2.6. Terminal service types;

[0205] 2.7 Network deployment scenarios corresponding to node devices;

[0206] 2.8 PRACH Configuration Table;

[0207] 2.9 Different PRACH cycles or different time units of PRACH transmission;

[0208] 2.10. At least one of the following: the period, structure type, and transmission bandwidth of the synchronization signal block associated with PRACH.

[0209] For example, when the preamble format configuration information is determined according to 2.1 above, if the PRACH time-frequency resource is located in an SBFD symbol, then one preamble format can be used. If the PRACH time-frequency resource is located in a non-SBFD symbol, then another preamble format can be used. For example, for a preamble format located in an SBFD resource, at least one of the following can be configured: not using OCC, not using scrambling sequence, repetition of multiple preamble sequences, larger GT, and larger CP. The preamble is transmitted or carried in the PRACH channel.

[0210] When the above preamble format configuration information is determined according to 2.2 above, the PRACH configured on demand uses one preamble format, and the PRACH configured non-on demand uses another preamble format.

[0211] When the preamble format configuration information is determined according to section 2.3 above, the terminal can request the network to configure a specified preamble format, for example, through an uplink WUS request. The terminal can activate a preamble format, the preamble format resource configuration of which can be pre-configured by the network.

[0212] When the above preamble format configuration information is determined according to 2.4 above, it can be indicated directly by a DCI; or a configuration containing preamble format information can be activated by a DCI; or a configuration containing preamble format information can be activated by a downlink WUS signal or channel.

[0213] When the preamble format configuration information is determined according to 2.5 above, the preamble format used as the WUS signal may be different from the preamble format used for initial access. For example, when the preamble signal acts as the WUS signal to trigger a specific signal such as SSB or SIB1, the reliability of the preamble signal is more important than its capacity. This preamble signal may not be configured with OCC, and the preamble may be configured with larger GT and CP, or even specific waveforms, or may be configured for transmission only on reserved frequency bands.

[0214] When the preamble format configuration information is determined according to section 2.6 above, preamble format 1 can be used for Internet of Things (IoT) services; preamble format 2 can be used for services with high coverage requirements or frequent repetitions; for example, preamble format 3 with OCC configuration can be used for services with high capacity requirements; and preamble format 4 can be used for eMBB services. Different services can be distinguished by a single parameter, such as priority.

[0215] When the preamble format configuration information is determined according to section 2.7 above, different preambles can be configured depending on whether it is an NTN scenario or a PRACH transmission requiring pre-compensation for time and / or frequency offset. For example, in such a scenario, a preamble format with larger GT and CP lengths can be configured.

[0216] When the preamble format configuration information is determined according to section 2.8 above, different preamble formats can be included in different PRACH configuration tables. Since subsets of different preamble formats may not be configured in the same cell, supporting all preamble formats in the same PRACH configuration table is unnecessary. The advantage of this design is that it saves signaling overhead.

[0217] When the preamble format configuration information is determined according to section 2.9 above, one preamble format is supported for even-numbered SSB to RO association mode periods, and another preamble format is supported for odd-numbered SSB to RO association mode periods. For example, a time window T that is an integer multiple of K, where T is a function of the pre-configured SSB to RO period, and K is determined by network configuration or protocol agreement, defines the pattern for different preamble formats. For instance, a K-bit bitmap is defined in units of SSB to RO association mode periods, where a bit of 0 indicates that the first preamble format A is used in the corresponding association mode period, and a bit of 1 indicates that another preamble format B is used in the corresponding association mode period. Generally, the pre-configured period can be the association mode period, mapping to a cycle, or associated with a period.

[0218] When the above preamble format configuration information is determined according to 2.10 above, a specific preamble format or multiple preamble formats are used for ROs associated with large-period SSBs; for ROs associated with small-period SSBs, another or a set of preamble formats are used.

[0219] In this embodiment of the application, since the preamble format configuration information can be determined according to at least one of 2.1 to 2.10 above, the preamble format configuration information can be determined by different information, thereby improving the flexibility of determining the preamble format configuration information.

[0220] Optionally, in the embodiments of this application, the above-mentioned preamble format configuration information can be carried by at least one of the following: System Information Block (SIB), Radio Resource Control (RRC), Paging, WUS signal, Physical Downlink Control Channel (PDCCH), and Media Access Control (MAC)-Control Element (CE).

[0221] In this embodiment of the application, since the preamble format configuration information can be carried by different signaling, the flexibility of carrying the preamble format configuration information can be improved.

[0222] In the preamble determination method provided in some embodiments of this application, since at least one preamble format configured by the node device to the terminal includes a first parameter and a second parameter, and the preamble format under different scenarios can be flexibly configured through the first parameter and the second parameter, the limitation on the number of usable preambles can be avoided, thereby improving the transmission efficiency of PRACH.

[0223] It should be noted that in this application, "enhanced duplex," "enhanced duplex mode," "XDD," "enhanced full duplex," and "enhanced full duplex mode" can represent a concept. They can be expressed as supporting uplink subband transmission within a downlink time unit and / or supporting downlink subband transmission within an uplink time unit and / or supporting both uplink and downlink subband transmission within a flexible time unit. Enhanced duplex can include network full duplex and terminal full duplex.

[0224] The SSB-to-RO mapping described in this application can also refer to the generalized association between downlink signals and uplink signals / resources, such as the relationship between CSI-RS and RO.

[0225] In this application, RO refers to the time-frequency resources required to send a preamble sequence and / or payload. Random access refers to the random access procedure.

[0226] The SSB and SS / PBCH block mentioned in this application can be used interchangeably or with other names. They can refer to any module that contains at least one of a synchronization signal, a broadcast signal or other downlink broadcast signal and its control channel.

[0227] The PRACH resource described in this application can be a PRACH time-frequency resource and / or a preamble sequence carried by it. The PRACH or preamble format can be any preamble format transmitted on the PRACH resource that includes one or more preamble sequences, one and / or more PRACH payloads, and at least one processing method mentioned in the preceding embodiments.

[0228] In this application, there is both a certain preamble format and another preamble format on PRACH, which can be called a shared RO. Different types of preamble formats are configured for transmission on different PRACH or PRACH occasions, which can be called separate RO or separately configured RO.

[0229] The PRACH and RACH mentioned in this application can also be at least one of WUS, uplink request signal, PUSCH transmission in RACH-less or LTM process, collision-based PUSCH transmission, PUSCH transmission for small data transmission, MsgA, MsgA PUSCH, SRS, and PUCCH. Specifically, the PUSCH transmission for small data transmission can be CG PUSCH transmission in RRC inactive state, and the PUCCH can be a public PUCCH configuration. The concepts of RO, PRACH resource, RACH resource, PRACH configuration, and RACH configuration can also be correspondingly described as transmission resources for at least one of the above signals.

[0230] This application provides a preamble determination method. Figure 25 shows a flowchart of a preamble determination method provided in some embodiments of this application. As shown in Figure 25, the preamble determination method provided in some embodiments of this application may include the following steps 301 and 302.

[0231] Step 301: At least one preamble format configured in the terminal receiving node device.

[0232] Step 302: The terminal determines the preamble to be transmitted on PRACH based on at least one preamble format.

[0233] Wherein, each of the above-mentioned at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of the first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the way the PRACH carries data, the payload size indication of the PRACH carrying data, and a specific PRACH.

[0234] Optionally, in the embodiments of this application, the first parameter may be used to configure at least one of the sequence length, subcarrier spacing, and waveform of the first sequence.

[0235] Optionally, in the embodiments of this application, the above-mentioned CP mode may include any of the following: a mode in which a CP exists before each sequence in a preamble format, a mode in which a CP exists only before the first sequence in a preamble format, and a mode in which no CP exists in a preamble format.

[0236] Optionally, in the embodiments of this application, the GT mode may include any of the following: a mode in which a GT exists after each sequence in a preamble format, a mode in which a GT exists only after the last sequence in a preamble format, and a mode in which no GT exists in a preamble format.

[0237] Optionally, in the embodiments of this application, the above-mentioned sequence repetition type is used to determine a group of repeating sequences in a preamble.

[0238] The aforementioned repeating sequence group includes any one of the following:

[0239] Sequences generated from the same root index;

[0240] A sequence generated by cyclic shifting the same root index;

[0241] The first repeating subsequence generated from the same root index, and the multiple conjugate sequence of the first repeating subsequence;

[0242] The second repeating subsequence generated by cyclic shifting the same root index, and the complex conjugate sequence of the second repeating subsequence;

[0243] Sequences generated from different root indices;

[0244] A sequence generated by cyclic shifting of different root indices.

[0245] Optionally, in the embodiments of this application, the above sequence expansion method may include any one of the following: an expansion method with OCC and an expansion method without OCC.

[0246] Optionally, in the embodiments of this application, the scrambling method of the first sequence may include any one of the following: a scrambling method with a scrambling sequence, or a scrambling method without a scrambling sequence.

[0247] Optionally, in the embodiments of this application, the scrambling method of the above scrambling sequence may include any of the following: uniform scrambling, non-uniform scrambling, and full scrambling.

[0248] Optionally, in the embodiments of this application, the way the PRACH carries data may include any of the following: a way carried by a sequence, or a way carried by payload information.

[0249] Optionally, in the embodiments of this application, the payload size indicator of the PRACH carrying data can be used to indicate any of the following: the payload size of the PRACH carrying data is greater than or not less than a first threshold, or the payload size of the PRACH carrying data is less than or not greater than a first threshold.

[0250] Optionally, in the embodiments of this application, the specific PRACH mentioned above can be a PRACH on a reserved frequency band, a reserved sub-frequency band, or a reserved carrier.

[0251] The reserved frequency band, the reserved sub-frequency band, or the reserved carrier mentioned above are resources dedicated to the specific PRACH transmissions mentioned above.

[0252] In some embodiments of this application, the preamble determination method can determine the preamble to be transmitted on PRACH based on at least one preamble format configured on the node device. Each of the at least one preamble format includes a first parameter and a second parameter. The first parameter and the second parameter can be used to configure the preamble format under different scenarios. Therefore, when determining the preamble, it can be based on the preamble format under different scenarios that can be flexibly configured, thereby avoiding the limitation on the number of usable preambles and improving the transmission efficiency of PRACH.

[0253] For further descriptions of the preamble determination method provided in some embodiments of this application, please refer to the relevant descriptions in the above-described node device-side method embodiments. To avoid repetition, they will not be repeated here.

[0254] The above-described method embodiments, or various possible implementations of the method embodiments, can be executed individually, or, provided there are no contradictions, they can be combined with each other. The specific implementation can be determined according to actual usage requirements, and this application embodiment does not impose any restrictions on this.

[0255] The preamble determination method provided in this application can be executed by a preamble determination device. This application uses an example of a preamble determination device executing the preamble determination method to illustrate the preamble determination device provided in this application.

[0256] This application provides a preamble determination device. As an example, the preamble determination device can be a communication device or a component within a communication device, such as a chip. The communication device can be a terminal, a network-side device, or a server, etc. Exemplarily, the terminal can be, but is not limited to, the type of terminal 11 listed above, and the network-side device can be, but is not limited to, the type of node device 12 listed above. This application does not impose specific limitations.

[0257] The preamble determination device includes a receiving module, a transmitting module, and a processing module. These modules can be implemented in software or hardware. When implemented in hardware, the processing module can be implemented by a processor. For example, the processor can include general-purpose processors, special-purpose processors, etc., such as central processing units (CPUs), microprocessors, digital signal processors (DSPs), artificial intelligence (AI) processors, graphics processing units (GPUs), application-specific integrated circuits (ASICs), network processors (NPs), field-programmable gate arrays (FPGAs), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc. The receiving and transmitting modules can be implemented by a communication interface, which can include one or more of the following: transceivers, pins, circuits, buses, radio frequency units, etc.

[0258] Specifically, referring to Figure 26, when the preamble determination device is a node device or a component in a node device, the preamble determination device 260 includes a first processing module 261.

[0259] The first processing module 261 can be used to configure at least one preamble format to the terminal; wherein the at least one preamble format is used to determine the preamble transmitted on the PRACH; each preamble format in the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, the payload size indication of the PRACH carrying data, and a specific PRACH.

[0260] In some embodiments of this application, the first parameter may specifically be used to configure at least one of the sequence length, subcarrier spacing, and waveform of the first sequence.

[0261] In some embodiments of this application, the above-mentioned CP mode may include any of the following: a mode in which a CP exists before each sequence in a preamble format, a mode in which a CP exists only before the first sequence in a preamble format, and a mode in which no CP exists in a preamble format.

[0262] In some embodiments of this application, the GT mode described above may include any of the following: a mode in which a GT exists after every sequence in a preamble format, a mode in which a GT exists only after the last sequence in a preamble format, and a mode in which no GT exists in a preamble format.

[0263] In some embodiments of this application, the above-mentioned sequence repetition type is used to determine a group of repeating sequences in a preamble; wherein the group of repeating sequences includes any one of the following: sequences generated by the same root index; sequences generated by cyclic shifts of the same root index; a first repeating subsequence generated by the same root index, and a complex conjugate sequence of the first repeating subsequence; a second repeating subsequence generated by cyclic shifts of the same root index, and a complex conjugate sequence of the second repeating subsequence; sequences generated by different root indices; and sequences generated by cyclic shifts of different root indices.

[0264] In some embodiments of this application, the above sequence expansion method may include any one of the following: an expansion method with OCC present, or an expansion method without OCC present.

[0265] In some embodiments of this application, the scrambling method of the first sequence may include any one of the following: a scrambling method with a scrambling sequence, or a scrambling method without a scrambling sequence.

[0266] In some embodiments of this application, the scrambling method of the above scrambling sequence may include any of the following: uniform scrambling, non-uniform scrambling, and full scrambling.

[0267] In some embodiments of this application, the way the PRACH carries data may include any of the following: carried by sequence or carried by payload information.

[0268] In some embodiments of this application, the above-mentioned payload size indicator for PRACH data can be used to indicate any of the following: the payload size of the PRACH data is greater than or not less than a first threshold, or the payload size of the PRACH data is less than or not greater than the first threshold.

[0269] In some embodiments of this application, the aforementioned specific PRACH can be a PRACH on a reserved frequency band, a reserved sub-frequency band, or a reserved carrier; wherein the reserved frequency band, the reserved sub-frequency band, or the reserved carrier is a resource dedicated to the transmission of the specific PRACH.

[0270] In some embodiments of this application, the first processing module 261 can be specifically used to configure at least one preamble format to the terminal based on first information; wherein, the first information includes at least one of the following: the way a RO mapped to a reference signal uses a preamble format; the way different ROs mapped to a reference signal use a preamble format; the way at least some different ROs within a group of ROs mapped to at least one reference signal use different preamble formats; the way different ROs within different groups of ROs mapped to at least one reference signal use different preamble formats; the way at least some of the ROs mapped to at least one reference signal use different preamble formats, wherein the symbol types of the multiple ROs are all different; the way different preamble groups associated with the same reference signal use different preamble formats; the way different preamble groups associated with different reference signals or different groups of reference signals use different preamble formats; the guard band mode among the multiple ROs mapped to at least one reference signal; and preamble format configuration information.

[0271] In some embodiments of this application, the preamble format configuration information described above can be determined based on at least one of the following: the time-frequency resource type of PRACH transmission; whether the PRACH resource is configured on demand; whether the PRACH is requested or activated by the terminal; whether the PRACH is dynamically indicated by the network or activated via downlink WUS; whether the preamble signal is used as a WUS signal; the service type of the terminal; the network deployment scenario corresponding to the node device; the PRACH configuration table; different PRACH periods or different time units of PRACH transmission; and at least one of the synchronization signal block period, structure type, and transmission bandwidth associated with the PRACH.

[0272] In some embodiments of this application, the preamble format configuration information described above can be carried by at least one of the following: system information block, radio resource control, paging, WUS signal, physical downlink control channel, and media access control-control unit.

[0273] In the preamble determination device provided in this application embodiment, since the preamble determination device configures at least one preamble format to the terminal, each preamble format includes a first parameter and a second parameter, and the preamble format under different scenarios can be flexibly configured through the first parameter and the second parameter, the limitation on the number of usable preambles can be avoided, thereby improving the transmission efficiency of PRACH.

[0274] The preamble determination device provided in this application embodiment can implement all the processes implemented in the above-described node device-side method embodiment and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0275] Referring to Figure 27, when the preamble determination device is a terminal or a component in a terminal, the preamble determination device 270 includes a receiving module 271 and a second processing module 272.

[0276] The receiving module 271 can be used to receive at least one preamble format configured by the receiving node device. The second processing module 272 can be used to determine the preamble to be transmitted on the PRACH based on the at least one preamble format. Each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, the payload size indication of the PRACH carrying data, and a specific PRACH.

[0277] In some embodiments of this application, the first parameter may specifically be used to configure at least one of the sequence length, subcarrier spacing, and waveform of the first sequence.

[0278] In some embodiments of this application, the above-mentioned CP mode may include any of the following: a mode in which a CP exists before each sequence in a preamble format, a mode in which a CP exists only before the first sequence in a preamble format, and a mode in which no CP exists in a preamble format.

[0279] In some embodiments of this application, the GT mode described above may include any of the following: a mode in which a GT exists after every sequence in a preamble format, a mode in which a GT exists only after the last sequence in a preamble format, and a mode in which no GT exists in a preamble format.

[0280] In some embodiments of this application, the above-mentioned sequence repetition type is used to determine a group of repeating sequences in a preamble; wherein the group of repeating sequences includes any one of the following: sequences generated by the same root index; sequences generated by cyclic shifts of the same root index; a first repeating subsequence generated by the same root index, and a complex conjugate sequence of the first repeating subsequence; a second repeating subsequence generated by cyclic shifts of the same root index, and a complex conjugate sequence of the second repeating subsequence; sequences generated by different root indices; and sequences generated by cyclic shifts of different root indices.

[0281] In some embodiments of this application, the above sequence expansion method may include any one of the following: an expansion method with OCC present, or an expansion method without OCC present.

[0282] In some embodiments of this application, the scrambling method of the first sequence may include any one of the following: a scrambling method with a scrambling sequence, or a scrambling method without a scrambling sequence.

[0283] In some embodiments of this application, the scrambling method of the above scrambling sequence may include any of the following: uniform scrambling, non-uniform scrambling, and full scrambling.

[0284] In some embodiments of this application, the way the PRACH carries data may include any of the following: carried by sequence or carried by payload information.

[0285] In some embodiments of this application, the above-mentioned payload size indicator for PRACH data can be used to indicate any of the following: the payload size of the PRACH data is greater than or not less than a first threshold, or the payload size of the PRACH data is less than or not greater than the first threshold.

[0286] In some embodiments of this application, the aforementioned specific PRACH can be a PRACH on a reserved frequency band, a reserved sub-frequency band, or a reserved carrier; wherein the reserved frequency band, the reserved sub-frequency band, or the reserved carrier is a resource dedicated to the transmission of the specific PRACH.

[0287] In the preamble determination device provided in this application embodiment, since the preamble determination device can determine the preamble to be transmitted on PRACH based on at least one preamble format configured by the node device, and each of the at least one preamble format includes a first parameter and a second parameter, the first parameter and the second parameter can be used to configure the preamble format under different scenarios. Therefore, when determining the preamble, it can be based on the preamble format under different scenarios with flexible configuration, thereby avoiding the limitation of the number of usable preambles and improving the transmission efficiency of PRACH.

[0288] The preamble determination device provided in this application embodiment can implement all the processes implemented in the above terminal-side method embodiment and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0289] As shown in Figure 28, this application embodiment also provides a communication device 100, including a processor 101 and a memory 102. The memory 102 stores programs or instructions that can run on the processor 101. For example, when the communication device 100 is a terminal, the program or instructions executed by the processor 101 implement the various steps of the above-described terminal-side method embodiment and achieve the same technical effect. When the communication device 100 is a network-side device, the program or instructions executed by the processor 101 implement the various steps of the above-described network-side device method embodiment and achieve the same technical effect. To avoid repetition, this will not be described again here.

[0290] This application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps in the above-described terminal-side method embodiments. This terminal embodiment corresponds to the above-described terminal-side method embodiments; all implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and achieve the same technical effects. The terminal may be the preamble determination device shown in FIG27. Specifically, FIG29 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of this application.

[0291] The terminal 1000 includes, but is not limited to, at least some of the following components: radio frequency unit 1001, network module 1002, audio output unit 1003, input unit 1004, sensor 1005, display unit 1006, user input unit 1007, interface unit 1008, memory 1009, and processor 1010.

[0292] Those skilled in the art will understand that the terminal 1000 may also include a power supply (such as a battery) for powering various components. The power supply can be logically connected to the processor 1010 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in Figure 29 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0293] It should be understood that, in this embodiment, the input unit 1004 may include a graphics processor 10041 and a microphone 10042. The graphics processor 10041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 1006 may include a display panel 10061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 1007 includes a touch panel 10071 and at least one of other input devices 10072. The touch panel 10071 is also called a touch screen. The touch panel 10071 may include a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0294] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 1001 can transmit it to the processor 1010 for processing; in addition, the radio frequency unit 1001 can send uplink data to the network-side device. Typically, the radio frequency unit 1001 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0295] The memory 1009 can be used to store software programs or instructions, as well as various data. The memory 1009 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 1009 may include volatile memory or non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 1009 in this embodiment includes, but is not limited to, these and any other suitable types of memory.

[0296] The processor 1010 may include one or more processing units; optionally, the processor 1010 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into the processor 1010.

[0297] The radio frequency unit 1001 can be used to receive at least one preamble format configured by the receiving node device. The processor 1010 can be used to determine the preamble to be transmitted on the PRACH based on the at least one preamble format. Each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, the payload size indication of the data carried on the PRACH, and a specific PRACH.

[0298] In some embodiments of this application, the first parameter may specifically be used to configure at least one of the sequence length, subcarrier spacing, and waveform of the first sequence.

[0299] In some embodiments of this application, the above-mentioned CP mode may include any of the following: a mode in which a CP exists before each sequence in a preamble format, a mode in which a CP exists only before the first sequence in a preamble format, and a mode in which no CP exists in a preamble format.

[0300] In some embodiments of this application, the GT mode described above may include any of the following: a mode in which a GT exists after every sequence in a preamble format, a mode in which a GT exists only after the last sequence in a preamble format, and a mode in which no GT exists in a preamble format.

[0301] In some embodiments of this application, the above-mentioned sequence repetition type is used to determine a group of repeating sequences in a preamble; wherein the group of repeating sequences includes any one of the following: sequences generated by the same root index; sequences generated by cyclic shifts of the same root index; a first repeating subsequence generated by the same root index, and a complex conjugate sequence of the first repeating subsequence; a second repeating subsequence generated by cyclic shifts of the same root index, and a complex conjugate sequence of the second repeating subsequence; sequences generated by different root indices; and sequences generated by cyclic shifts of different root indices.

[0302] In some embodiments of this application, the above sequence expansion method may include any one of the following: an expansion method with OCC present, or an expansion method without OCC present.

[0303] In some embodiments of this application, the scrambling method of the first sequence may include any one of the following: a scrambling method with a scrambling sequence, or a scrambling method without a scrambling sequence.

[0304] In some embodiments of this application, the scrambling method of the above scrambling sequence may include any of the following: uniform scrambling, non-uniform scrambling, and full scrambling.

[0305] In some embodiments of this application, the way the PRACH carries data may include any of the following: carried by sequence or carried by payload information.

[0306] In some embodiments of this application, the above-mentioned payload size indicator for PRACH data can be used to indicate any of the following: the payload size of the PRACH data is greater than or not less than a first threshold, or the payload size of the PRACH data is less than or not greater than the first threshold.

[0307] In some embodiments of this application, the aforementioned specific PRACH can be a PRACH on a reserved frequency band, a reserved sub-frequency band, or a reserved carrier; wherein the reserved frequency band, the reserved sub-frequency band, or the reserved carrier is a resource dedicated to the transmission of the specific PRACH.

[0308] In the terminal provided in this application embodiment, since the terminal can determine the preamble to be transmitted on PRACH based on at least one preamble format configured by the node device, and each of the at least one preamble format includes a first parameter and a second parameter, the first parameter and the second parameter can be used to configure the preamble format under different scenarios. Therefore, when determining the preamble, it can be based on the preamble format under different scenarios that are flexibly configured, thereby avoiding the limitation on the number of usable preambles and improving the transmission efficiency of PRACH.

[0309] It is understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the above terminal-side method embodiment and achieve the same or corresponding technical effects. To avoid repetition, it will not be described again here.

[0310] This application also provides a network-side device, including a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps of the above-described node device method embodiment. This network-side device embodiment corresponds to the above-described node device method embodiment. All implementation processes and methods of the above method embodiments can be applied to this network-side device embodiment and achieve the same technical effects.

[0311] Specifically, this application embodiment also provides a network-side device, which may be the preamble determination device shown in FIG26. As shown in FIG30, the network-side device 1100 includes: an antenna 111, a radio frequency device 112, a baseband device 113, a processor 114, and a memory 115. The antenna 111 is connected to the radio frequency device 112. In the uplink direction, the radio frequency device 112 receives information through the antenna 111 and sends the received information to the baseband device 113 for processing. In the downlink direction, the baseband device 113 processes the information to be transmitted and sends it to the radio frequency device 112. The radio frequency device 112 processes the received information and transmits it through the antenna 111.

[0312] The method executed by the network-side device in the above embodiments can be implemented in the baseband device 113, which includes a baseband processor.

[0313] The baseband device 113 may include at least one baseband board, on which multiple chips are disposed, as shown in FIG30. One of the chips is, for example, a baseband processor, which is connected to the memory 115 via a bus interface to call the program or instructions in the memory 115 to execute the network-side device operation shown in the above method embodiment.

[0314] The network-side device may also include a network interface 116, such as a Common Public Radio Interface (CPRI).

[0315] The processor 114 can be used to configure at least one preamble format to the terminal; wherein the at least one preamble format is used to determine the preamble transmitted on the PRACH; each preamble format in the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, the payload size indication of the PRACH carrying data, and a specific PRACH.

[0316] In some embodiments of this application, the first parameter may specifically be used to configure at least one of the sequence length, subcarrier spacing, and waveform of the first sequence.

[0317] In some embodiments of this application, the above-mentioned CP mode may include any of the following: a mode in which a CP exists before each sequence in a preamble format, a mode in which a CP exists only before the first sequence in a preamble format, and a mode in which no CP exists in a preamble format.

[0318] In some embodiments of this application, the GT mode described above may include any of the following: a mode in which a GT exists after every sequence in a preamble format, a mode in which a GT exists only after the last sequence in a preamble format, and a mode in which no GT exists in a preamble format.

[0319] In some embodiments of this application, the above-mentioned sequence repetition type is used to determine a group of repeating sequences in a preamble; wherein the group of repeating sequences includes any one of the following: sequences generated by the same root index; sequences generated by cyclic shifts of the same root index; a first repeating subsequence generated by the same root index, and a complex conjugate sequence of the first repeating subsequence; a second repeating subsequence generated by cyclic shifts of the same root index, and a complex conjugate sequence of the second repeating subsequence; sequences generated by different root indices; and sequences generated by cyclic shifts of different root indices.

[0320] In some embodiments of this application, the above sequence expansion method may include any one of the following: an expansion method with OCC present, or an expansion method without OCC present.

[0321] In some embodiments of this application, the scrambling method of the first sequence may include any one of the following: a scrambling method with a scrambling sequence, or a scrambling method without a scrambling sequence.

[0322] In some embodiments of this application, the scrambling method of the above scrambling sequence may include any of the following: uniform scrambling, non-uniform scrambling, and full scrambling.

[0323] In some embodiments of this application, the way the PRACH carries data may include any of the following: carried by sequence or carried by payload information.

[0324] In some embodiments of this application, the above-mentioned payload size indicator for PRACH data can be used to indicate any of the following: the payload size of the PRACH data is greater than or not less than a first threshold, or the payload size of the PRACH data is less than or not greater than the first threshold.

[0325] In some embodiments of this application, the aforementioned specific PRACH can be a PRACH on a reserved frequency band, a reserved sub-frequency band, or a reserved carrier; wherein the reserved frequency band, the reserved sub-frequency band, or the reserved carrier is a resource dedicated to the transmission of the specific PRACH.

[0326] In some embodiments of this application, the processor 114 can be specifically configured to configure at least one preamble format to the terminal based on first information; wherein the first information includes at least one of the following: a preamble format used for one RO mapped to a reference signal; a preamble format used for different ROs mapped to a reference signal; a different preamble format used for at least some different ROs within a group of ROs mapped to at least one reference signal; a different preamble format used for ROs within different groups of ROs mapped to at least one reference signal; a different preamble format used for at least some ROs mapped to at least one reference signal, wherein the symbol types of the multiple ROs are all different; a different preamble format used for different preamble groups associated with the same reference signal; a different preamble format used for different preamble groups associated with different reference signals or different groups of reference signals; a guard band mode among the multiple ROs mapped to at least one reference signal; and preamble format configuration information.

[0327] In some embodiments of this application, the preamble format configuration information described above can be determined based on at least one of the following: the time-frequency resource type of PRACH transmission; whether the PRACH resource is configured on demand; whether the PRACH is requested or activated by the terminal; whether the PRACH is dynamically indicated by the network or activated via downlink WUS; whether the preamble signal is used as a WUS signal; the service type of the terminal; the network deployment scenario corresponding to the node device; the PRACH configuration table; different PRACH periods or different time units of PRACH transmission; and at least one of the synchronization signal block period, structure type, and transmission bandwidth associated with the PRACH.

[0328] In some embodiments of this application, the preamble format configuration information described above can be carried by at least one of the following: system information block, radio resource control, paging, WUS signal, physical downlink control channel, and media access control-control unit.

[0329] In the network-side device provided in this application embodiment, since the network-side device configures at least one preamble format to the terminal, each of which includes a first parameter and a second parameter, and the preamble format under different scenarios can be flexibly configured through the first parameter and the second parameter, the limitation on the number of usable preambles can be avoided, thereby improving the transmission efficiency of PRACH.

[0330] It is understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the above node device method embodiment and achieve the same or corresponding technical effects. To avoid repetition, it will not be described again here.

[0331] In addition, the network-side device 1100 of this application embodiment also includes: a program or instructions stored in the memory 115 and executable on the processor 114. The processor 114 calls the program or instructions in the memory 115 to execute the method executed by the power-saving device described above and achieve the same technical effect. To avoid repetition, it will not be described in detail here.

[0332] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described preamble determination method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0333] The processor mentioned above is either the processor in the terminal described in the above embodiments or the processor in the power-saving device. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0334] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described preamble determination method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0335] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0336] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described preamble determination method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0337] This application also provides a communication system, including: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the terminal-side method as described above, and the network-side device can be used to perform the steps of the node-side method as described above.

[0338] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0339] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.), and the computer software product includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0340] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A method for determining a preamble, the method comprising: The node device configures at least one preamble format to the terminal; Wherein, the at least one preamble format is used to determine the preamble transmitted on the Physical Random Access Channel (PRACH); each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: Cyclic Prefix (CP) mode, Guard Time (GT) mode, Sequence Repetition Type, Sequence Spreading Method, Scrambling Method of the First Sequence, Scrambling Method of the Scrambling Sequence, Whether the PRACH Carries Data Information, How the PRACH Carries Data, Indicator of the Payload Size of the PRACH Carrying Data, and Specific PRACH.

2. The method according to claim 1, wherein, The first parameter is specifically used to configure at least one of the sequence length, subcarrier spacing, and waveform of the first sequence.

3. The method according to claim 1 or 2, wherein, The CP mode includes any of the following: a mode in which a CP exists before each sequence in a preamble format, a mode in which a CP exists only before the first sequence in a preamble format, and a mode in which no CP exists in a preamble format.

4. The method according to any one of claims 1 to 3, wherein, The GT mode includes any of the following: a mode in which a GT exists after every sequence in a preamble format, a mode in which a GT exists only after the last sequence in a preamble format, and a mode in which no GT exists in a preamble format.

5. The method according to any one of claims 1 to 4, wherein, The sequence repetition type is used to identify a group of repeating sequences in a preamble; The repeating sequence group includes any one of the following: Sequences generated from the same root index; A sequence generated by cyclic shifting the same root index; The first repeating subsequence generated from the same root index, and the complex conjugate sequence of the first repeating subsequence; The second repeating subsequence generated by cyclic shifting the same root index, and the complex conjugate sequence of the second repeating subsequence; Sequences generated from different root indices; A sequence generated by cyclic shifting of different root indices.

6. The method according to any one of claims 1 to 5, wherein, The sequence expansion method includes any one of the following: an expansion method with an orthogonal covering code (OCC) or an expansion method without an OCC.

7. The method according to any one of claims 1 to 6, wherein, The scrambling method of the first sequence includes any one of the following: scrambling method with scrambling sequence, scrambling method without scrambling sequence.

8. The method according to any one of claims 1 to 7, wherein, The scrambling method of the scrambling sequence includes any one of the following: uniform scrambling, non-uniform scrambling, and full scrambling.

9. The method according to any one of claims 1 to 8, wherein, The PRACH carries data in one of the following ways: by sequence or by payload information.

10. The method according to any one of claims 1 to 9, wherein, The payload size indicator of the PRACH data is used to indicate either: the payload size of the PRACH data is greater than or not less than a first threshold, or the payload size of the PRACH data is less than or not greater than the first threshold.

11. The method according to any one of claims 1 to 10, wherein, The specific PRACH is a PRACH on a reserved frequency band, a reserved sub-frequency band, or a reserved carrier; The reserved frequency band, the reserved sub-frequency band, or the reserved carrier are resources dedicated to the specific PRACH transmission.

12. The method according to any one of claims 1 to 11, wherein, The node device configures at least one preamble format to the terminal, including: The node device configures the at least one preamble format to the terminal based on the first information; The first information includes at least one of the following: A physical random access channel transmission opportunity (RO) mapped to a reference signal uses a preamble format. Different ROs mapped to a reference signal use a preamble format. For at least some of the different ROs within a group of ROs mapped to at least one reference signal, different preamble formats are used; Different preamble formats are used for ROs in different RO groups that are mapped to at least one reference signal; For at least some of the multiple ROs mapped to at least one reference signal, different preamble formats are used, and the multiple ROs are all of different symbol types; Different preamble groups associated with the same reference signal use different preamble formats; Different preamble formats are used for different preamble groups associated with different reference signals or different reference signal groups. Guard band mode mapped to multiple ROs of at least one reference signal; Preamble format configuration information.

13. The method according to claim 12, wherein, The preamble format configuration information is determined based on at least one of the following: Time-frequency resource type for PRACH transmission; Are PRACH resources configured on demand? PRACH is requested or activated by the terminal; PRACH is activated by network dynamic indication or via downlink wake-up signal WUS; Is the preamble signal used as the WUS signal? Terminal service types; The network deployment scenarios corresponding to the node devices; PRACH configuration table; Different PRACH cycles or different time units of PRACH transmission; The synchronization signal block period, structure type, and transmission bandwidth associated with PRACH must be at least one of these.

14. The method according to claim 12 or 13, wherein, The preamble format configuration information is carried through at least one of the following: system information block, radio resource control, paging, WUS signal, physical downlink control channel, and media access control-control unit.

15. A method for determining a preamble, the method comprising: At least one preamble format configured in the terminal receiving node device; The terminal determines the preamble to be transmitted on PRACH based on the at least one preamble format; Wherein, each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of the first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the way the PRACH carries data, the payload size indication of the PRACH carrying data, and a specific PRACH.

16. The method according to claim 15, wherein, The first parameter is specifically used to configure at least one of the sequence length, subcarrier spacing, and waveform of the first sequence.

17. The method according to claim 15 or 16, wherein, The CP mode includes any of the following: a mode in which a CP exists before each sequence in a preamble format, a mode in which a CP exists only before the first sequence in a preamble format, and a mode in which no CP exists in a preamble format.

18. The method according to any one of claims 15 to 17, wherein, The GT mode includes any of the following: a mode in which a GT exists after every sequence in a preamble format, a mode in which a GT exists only after the last sequence in a preamble format, and a mode in which no GT exists in a preamble format.

19. The method according to any one of claims 15 to 18, wherein, The sequence repetition type is used to identify a group of repeating sequences in a preamble; The repeating sequence group includes any one of the following: Sequences generated from the same root index; A sequence generated by cyclic shifting the same root index; The first repeating subsequence generated from the same root index, and the complex conjugate sequence of the first repeating subsequence; The second repeating subsequence generated by cyclic shifting the same root index, and the complex conjugate sequence of the second repeating subsequence; Sequences generated from different root indices; A sequence generated by cyclic shifting of different root indices.

20. The method according to any one of claims 15 to 19, wherein, The sequence expansion method includes any one of the following: an expansion method with OCC, or an expansion method without OCC.

21. The method according to any one of claims 15 to 20, wherein, The scrambling method of the first sequence includes any one of the following: scrambling method with scrambling sequence, scrambling method without scrambling sequence.

22. The method according to any one of claims 15 to 21, wherein, The scrambling method of the scrambling sequence includes any one of the following: uniform scrambling, non-uniform scrambling, and full scrambling.

23. The method according to any one of claims 15 to 22, wherein, The PRACH carries data in one of the following ways: by sequence or by payload information.

24. The method according to any one of claims 15 to 23, wherein, The payload size indicator of the PRACH data is used to indicate either: the payload size of the PRACH data is greater than or not less than a first threshold, or the payload size of the PRACH data is less than or not greater than the first threshold.

25. The method according to any one of claims 15 to 24, wherein, The specific PRACH is a PRACH on a reserved frequency band, a reserved sub-frequency band, or a reserved carrier; The reserved frequency band, the reserved sub-frequency band, or the reserved carrier are resources dedicated to the specific PRACH transmission.

26. A preamble determination device, the device comprising a first processing module; The first processing module is used to configure at least one preamble format to the terminal; in, The at least one preamble format is used to determine the preamble transmitted on the PRACH; each preamble format in the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of a first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the method of carrying data on the PRACH, the payload size indication of the PRACH carrying data, and a specific PRACH.

27. The apparatus according to claim 26, wherein, The first processing module is specifically used to configure the at least one preamble format to the terminal based on the first information; The first information includes at least one of the following: An RO mapped to a reference signal uses a preamble format. Different ROs mapped to a reference signal use a preamble format. For at least some of the different ROs within a group of ROs mapped to at least one reference signal, different preamble formats are used; Different preamble formats are used for ROs in different RO groups that are mapped to at least one reference signal; For at least some of the multiple ROs mapped to at least one reference signal, different preamble formats are used, and the multiple ROs are all of different symbol types; Different preamble groups associated with the same reference signal use different preamble formats; Different preamble formats are used for different preamble groups associated with different reference signals or different reference signal groups. Guard band mode mapped to multiple ROs of at least one reference signal; Preamble format configuration information.

28. A preamble determination device, the device comprising a receiving module and a second processing module; The receiving module is used to receive at least one preamble format configured by the node device; The second processing module is used to determine the preamble to be transmitted on PRACH based on the at least one preamble format; in, Each of the at least one preamble format includes at least a first parameter and a second parameter; the first parameter is used to configure the preamble composed of the first sequence; the second parameter is used to configure at least one of the following: CP mode, GT mode, sequence repetition type, sequence expansion method, scrambling method of the first sequence, scrambling method of the scrambling sequence, whether the PRACH carries data information, the way the PRACH carries data, the payload size indication of the PRACH carrying data, and a specific PRACH.

29. The apparatus according to claim 28, wherein, The first parameter is specifically used to configure at least one of the sequence length, subcarrier spacing, and waveform of the first sequence.

30. A terminal comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the preamble determination method as claimed in any one of claims 15 to 25.

31. A network-side device, comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the preamble determination method as described in any one of claims 1 to 14.

32. A readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of the preamble determination method as described in any one of claims 1 to 14, or implement the steps of the preamble determination method as described in any one of claims 15 to 25.

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