Transmission method, device, equipment, medium and program product of random access channel

Abstract

The application discloses a transmission method, device, equipment, medium and program product of a random access channel, and relates to the field of communication. The method comprises the following steps: transmitting the random access channel according to relevant parameters when the random access channel is transmitted in first type time domain resources and / or relevant parameters when the random access channel is transmitted in second type time domain resources. The method provided by the application can enable a terminal device to determine relevant parameters of the random access channel when the random access channel is transmitted for different types of time domain resources, and realize differentiated design for different types of time domain resources.

Description

[0001] This application is a divisional application of the invention application filed on February 5, 2024, with application number 202480076471.2 and entitled "Transmission method, apparatus, device, medium and program product for random access channel". Technical Field

[0002] This application relates to the field of communications, and in particular to a method, apparatus, device, medium, and program product for transmitting random access channels. Background Technology

[0003] Random access is an essential process for establishing a wireless link between terminal devices and network devices. Terminal devices need to determine relevant parameters before sending random access channel signals.

[0004] However, as the duplexing methods in New Radio (NR) systems are constantly being designed and optimized, how to design a transmission method for the random access channel to enable the random access channel to transmit based on different duplexing methods is a problem that urgently needs to be solved. Summary of the Invention

[0005] This application provides a method, apparatus, device, medium, and program product for transmitting random access channels. The technical solution is as follows:

[0006] According to one aspect of this application, a method for transmitting a random access channel is provided, the method being performed by a terminal device, the method comprising:

[0007] The random access channel is transmitted according to the relevant parameters of the random access channel when transmitted in the first type of time domain resource and / or the relevant parameters when transmitted in the second type of time domain resource.

[0008] According to one aspect of this application, a method for transmitting a random access channel is provided, the method being performed by a network device, the method comprising:

[0009] The terminal device receives the random access channel, which is sent by the terminal device based on the relevant parameters of the random access channel when transmitted in the first type of time domain resources and / or the relevant parameters when transmitted in the second type of time domain resources.

[0010] According to one aspect of this application, a method for transmitting a random access channel is provided, the method being performed by a terminal device, the method comprising:

[0011] The system receives at least one of a first configuration, a second configuration, and a third configuration, wherein the first configuration, the second configuration, and the third configuration are used to configure relevant parameters for transmission of the random access channel, the first configuration corresponds to the first type of time-domain resource, the second configuration corresponds to the second type of time-domain resource, and the third configuration corresponds to both the first type of time-domain resource and the second type of time-domain resource.

[0012] According to one aspect of this application, a method for transmitting a random access channel is provided, the method being performed by a terminal device, the method comprising:

[0013] Transmit the random access channel on a valid random access channel transmission opportunity;

[0014] A random access channel transmission opportunity is valid if: the random access channel transmission opportunity is within an uplink symbol; or, the random access channel transmission opportunity is within a first type of time domain resource and the random access channel transmission opportunity is located within a first frequency domain bandwidth.

[0015] According to one aspect of this application, a transmission apparatus for a random access channel is provided, the apparatus comprising:

[0016] The first transmitting module is configured to transmit the random access channel according to the relevant parameters of the random access channel when it is transmitted in the first type of time domain resource and / or the relevant parameters when it is transmitted in the second type of time domain resource.

[0017] According to one aspect of this application, a transmission apparatus for a random access channel is provided, the apparatus comprising:

[0018] The second receiving module is used to receive the random access channel, which is sent by the terminal device according to the relevant parameters of the random access channel when transmitted in the first type of time domain resources and / or the relevant parameters when transmitted in the second type of time domain resources.

[0019] According to one aspect of this application, a transmission apparatus for a random access channel is provided, the apparatus comprising:

[0020] The third receiving module is used to receive at least one of the first configuration, the second configuration, and the third configuration. The first configuration, the second configuration, and the third configuration are used to configure relevant parameters for transmission of the random access channel. The first configuration corresponds to the first type of time domain resource, the second configuration corresponds to the second type of time domain resource, and the third configuration corresponds to both the first type of time domain resource and the second type of time domain resource.

[0021] According to one aspect of this application, a transmission apparatus for a random access channel is provided, the apparatus comprising:

[0022] The transmission module is used to transmit the random access channel on a valid random access channel transmission opportunity;

[0023] A random access channel transmission opportunity is valid if: the random access channel transmission opportunity is within an uplink symbol; or, the random access channel transmission opportunity is within a first type of time domain resource and the random access channel transmission opportunity is located within a first frequency domain bandwidth.

[0024] According to one aspect of this application, a terminal device is provided, the terminal device comprising:

[0025] Processor; transceiver connected to the processor; memory for storing executable instructions of the processor;

[0026] The processor is configured to load and execute the executable instructions to implement the above-described random access channel transmission method.

[0027] According to one aspect of this application, a network device is provided, the network device comprising:

[0028] Processor; transceiver connected to the processor; memory for storing executable instructions of the processor;

[0029] The processor is configured to load and execute the executable instructions to implement the above-described random access channel transmission method.

[0030] According to one aspect of this application, a computer-readable storage medium is provided, wherein at least one program is stored therein, the at least one program being loaded and executed by a processor to implement the above-described transmission method for a random access channel.

[0031] According to one aspect of this application, a chip is provided, the chip including programmable logic circuitry and / or program instructions, which, when the chip is running on a terminal device or network device, is used to implement the above-described random access channel transmission method.

[0032] According to one aspect of this application, a computer program product is provided, the computer program product including computer instructions stored in a computer-readable storage medium, a processor retrieving the computer instructions from the computer-readable storage medium, and the processor executing the computer instructions to implement the above-described random access channel transmission method.

[0033] The technical solutions provided in this application have at least the following beneficial effects:

[0034] The terminal device transmits a random access channel based on the relevant parameters used when transmitting in the first type of time-domain resource and / or the relevant parameters used when transmitting in the second type of time-domain resource. In other words, the terminal device can determine the relevant parameters used for transmission under each time-domain resource type and transmit the random access channel based on these parameters. Since the number, location, size, and frequency bandwidth of available uplink resources differ in different time-domain resource types, the interference experienced by the terminal device when transmitting using different time-domain resource types will vary. Therefore, the link quality corresponding to different time-domain resource types also differs. Determining different relevant parameters for transmission for different time-domain resource types can improve the transmission success rate. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of subband non-overlapping full-duplex provided by related technologies is shown;

[0037] Figure 2 A schematic diagram of the frequency domain resource configuration of the Physical Random Access Channel (PRACH) provided by related technologies is shown.

[0038] Figure 3 A schematic diagram of PRACH power control provided by related technologies is shown;

[0039] Figure 4 A schematic diagram of a mobile communication system provided in an exemplary embodiment of this application is shown;

[0040] Figure 5 A flowchart illustrating a transmission method for a random access channel provided in an exemplary embodiment of this application is shown;

[0041] Figure 6 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0042] Figure 7 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0043] Figure 8 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0044] Figure 9 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0045] Figure 10 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0046] Figure 11 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0047] Figure 12 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0048] Figure 13 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0049] Figure 14 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0050] Figure 15 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0051] Figure 16 A schematic diagram of a random access channel transmission method provided in an exemplary embodiment of this application is shown;

[0052] Figure 17 A flowchart illustrating a transmission method for a random access channel provided in an exemplary embodiment of this application is shown;

[0053] Figure 18 A flowchart illustrating a transmission method for a random access channel provided in an exemplary embodiment of this application is shown;

[0054] Figure 19 A flowchart illustrating a transmission method for a random access channel provided in an exemplary embodiment of this application is shown;

[0055] Figure 20 This invention provides a structural block diagram of a transmission apparatus for a random access channel according to an exemplary embodiment of the present application.

[0056] Figure 21 This invention provides a structural block diagram of a transmission apparatus for a random access channel according to an exemplary embodiment of the present application.

[0057] Figure 22This invention provides a structural block diagram of a transmission apparatus for a random access channel according to an exemplary embodiment of the present application.

[0058] Figure 23 This invention provides a structural block diagram of a transmission apparatus for a random access channel according to an exemplary embodiment of the present application.

[0059] Figure 24 This invention provides a schematic diagram of the structure of a terminal device according to an exemplary embodiment of the present application.

[0060] Figure 25 A schematic diagram of the structure of a network device provided in an exemplary embodiment of this application is shown. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Exemplary embodiments will be described in detail here, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0062] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0063] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0064] The technical solutions described in some embodiments of this application can be applied to various communication systems, such as: Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (LTE), Advanced Long Term Evolution (LTE-A), New Radio (NR), evolution systems of NR, LTE-based access to unlicensed spectrum (LTE-U), NR-based access to unlicensed spectrum (NR-U), Non-Terrestrial Networks (NTN), Universal Mobile Telecommunication System (UMTS), and Wireless Local Area Networks (WLANs). Networks (WLAN), Wireless Fidelity (WiFi), 5th-Generation (5G) systems, cellular IoT systems, cellular passive IoT systems, and can also be applied to subsequent evolution systems of 5G NR systems, as well as 6G and subsequent evolution systems.

[0065] It should be understood that in some embodiments of this application, "5G" may also be referred to as "5G NR" or "NR".

[0066] It should be understood that in the description of the embodiments of this application, the term "correspondence" may indicate that there is a direct or indirect correspondence between the two, or that there is an association between the two, or that there is a relationship of instruction and being instructed, configuration and being configured, etc.

[0067] In this embodiment of the application, "predefined" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0068] In this application embodiment, "protocol" may refer to standard protocols in the field of communication, such as LTE protocol, NR protocol and related protocols applied to future communication systems, and this application does not limit it.

[0069] Next, we will introduce Subband Non-overlapping Full Duplex (SBFD):

[0070] To overcome the problems of weak uplink coverage, high uplink latency, and insufficient uplink capacity caused by limited uplink (UL) resource allocation in Time Division Duplexing (TDD) technology, SBFD technology was proposed. SBFD technology refers to the ability to simultaneously transmit and receive data on different subbands within the same subframe, time slot, or symbol. SBFD technology is primarily used on the network equipment side, while the user equipment (UE) side maintains its current state, meaning that data is only transmitted or only received within the same subframe / time slot / symbol. SBFD technology can also be called Cross Division Duplex (XDD) technology.

[0071] For example, SBFD technology such as Figure 1 As shown, a portion of the frequency domain resources corresponding to a downlink (DL) time domain unit is configured as an uplink subband. For example... Figure 1 As shown in (a), the intermediate subband of the frequency domain resource corresponding to a downlink time domain unit is configured as an uplink subband, or, as... Figure 1 As shown in (b), the upper part of the frequency domain resource corresponding to a downlink time domain unit is configured as an uplink subband.

[0072] Generally, SBFD operations satisfy the following conditions:

[0073] •SBFD operates within a TDD carrier.

[0074] The SBFD scheme is designed within a single uplink and downlink BWP (Bandwidth Part) pair with an aligned center frequency.

[0075] Within a TDD carrier, there can be at most one uplink subband on a single SBFD symbol (including conventional uplink symbols). This uplink subband can be located in the middle of the TDD carrier or on either side of it. Furthermore, the protocol stipulates that uplink transmission is restricted to the UL subband, and downlink reception is restricted to the DL subband.

[0076] Next, we will introduce the Physical Random Access Channel (PRACH):

[0077] PRACH-related parameters are configured through the Random Access Generic (RACH-ConfigGeneric). The parameters in RACH-ConfigGeneric will be explained from three aspects: time-domain resource configuration, frequency-domain resource configuration, and power control.

[0078] PRACH time-domain resource configuration:

[0079] In 5G NR, the time-domain resources corresponding to the random access channel are determined according to the PRACH configuration tables. There are three PRACH configuration tables, each corresponding to a different frequency band and frequency band standard: PRACH configuration table 1 is the PRACH configuration for the FDD (Frequency Division Duplexing) band on FR1 (Frequency Range 1), PRACH configuration table 2 is the PRACH configuration for the TDD band on FR1, and PRACH configuration table 3 is the PRACH configuration for FR2. The terminal device determines the PRACH configuration table to use when receiving PRACH configurations based on the frequency band and frequency band standard of the cell it is camped on.

[0080] When configuring the time-domain resources corresponding to the cell random access channel for the terminal device, a sequence number in the corresponding PRACH configuration table is indicated by the relevant parameter, prach-ConfigurationIndex. The terminal obtains the PRACH time-domain resource configuration information for the cell according to the corresponding PRACH configuration table. This time-domain resource configuration information includes:

[0081] 1. PRACH sequence format: All long and short sequence formats will be configured on FR1, while only the short sequence format will be configured on FR2.

[0082] 2. Configure the repetition period and system frame number: The repetition period of the PRACH transmission opportunity and the system frame number it belongs to. NR supports period configurations of 10ms, 20ms, 40ms, 80ms and 160ms.

[0083] 3. Subframe / Time Slot Number: The subframe number or time slot number that the PRACH transmitter will appear in within the system frame; where FR1 indicates the subframe number, which is also the 15KHz time slot number; while FR2 indicates the 60KHz time slot number.

[0084] 4. For short sequences, the number of PRACH slots in a subframe or a 60kHz slot will also be configured. When the random access sequence is configured with a larger subcarrier spacing, there will be 2 PRACH slots in a subframe or a 60kHz slot. When the indication value is 2, both PRACH slots can be used; when the indication is 1 PRACH slot, the later PRACH slot will be used by default.

[0085] 5. Start Symbol and Duration: The starting position and duration of a PRACH transmission occasion within a PRACH time slot. The duration is the number of consecutive occurrences. Even with the same sequence format, period, and time slot number, different start positions and durations can be configured, thus providing a wider variety of PRACH density configurations.

[0086] PRACH frequency domain resource configuration:

[0087] In the frequency domain, NR supports configuring 1, 2, 4, or 8 FDM (Frequency Division Multiplexing) PRACH resources. This is achieved through the parameter msg1-FDM, which expands the PRACH capacity and determines the number of PRACH transmission opportunities in the frequency domain, i.e., the number of PRACH resources. When more than one PRACH resource is configured in the frequency domain, these resources are distributed continuously. The network device notifies the terminal device of the offset of the starting PRB (Physical Resource Block) of the first PRACH transmission opportunity in the frequency domain relative to the starting PRB of the BWP through the parameter msg1-FrequencyStart. For example, ... Figure 2 As shown, PRACH transmission opportunities in the frequency domain are selected by using msg1-FDM and msg1-FrequencyStart.

[0088] PRACH power control:

[0089] The PRACH power control adopts an open-loop power control mechanism. The UE sets the PRACH transmission power based on factors such as the expected received power configured by the network equipment and the path loss measured by the downlink reference signal.

[0090] The terminal determines the PRACH transmission power using the following formula:

[0091]

[0092] Where f is the carrier; c is the serving cell; b is the BWP; i is the PRACH transmission opportunity; P CMAX，f，c (i) The maximum output power configured for the UE; P PRACH，target，f，c For the leading target power; PL b，f，c This is due to road damage.

[0093] Leader target power P PRACH，target，f，c The calculation formula is shown below.

[0094] P PRACH，target，f，c =preambleReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_POWER_RAMPING_COUNTER–1)×PREAMBLE_POWER_RAMPING_STEP;

[0095] Among them, the preamble target received power (preambleReceivedTargetPower) is configured through signaling and can also be called the target power level; the preamble increment (DELTA_PREAMBLE) is determined based on at least one of the random access preamble format, the subcarrier spacing used, and a fixed value agreed upon by the protocol; the number of retransmissions (PREAMBLE_POWER_RAMPING_COUNTER), also known as the preamble power ramp-up count, is determined based on the power ramp-up counter and is initialized to 1 at the beginning of each random access procedure; the power ramp-up step size (PREAMBLE_POWER_RAMPING_STEP), also known as the preamble power ramp-up step size, is used to indicate the step size of the power ramp-up.

[0096] During random access, if the UE sends a PRACH but does not receive a RAR (Random Access Response) from the network or fails to receive a conflict resolution message, the UE needs to retransmit the PRACH. When an NR UE supports multiple transmit beams, during retransmission, if the transmit beam remains unchanged, the transmit power of the retransmitted PRACH is increased based on the transmit power of the previously sent PRACH. This can be understood as incrementing the retransmission count by 1, or incrementing a power ramp-up counter by 1, until the random access process is successfully completed. However, when the UE switches transmit beams, considering both interference control during beam switching and the latency of random access, the protocol stipulates that the power ramp-up counter remains unchanged. Figure 3As shown, the slanted ellipse 11 represents the transmit beam used in this transmission, and the dashed ellipse 12 represents the transmit beam not used in this transmission. The same transmit beam is used in the initial transmission, the first retransmission, and the second retransmission. Therefore, the power ramp counter is incremented by 1 during each retransmission. In the third retransmission, the transmit beam used is different from the one used in the previous transmission. Therefore, the power ramp counter remains unchanged during the third retransmission. In the fourth retransmission, the transmit beam used is unchanged, and the power ramp counter is incremented by 1.

[0097] Figure 4 A schematic diagram of a mobile communication system provided in an exemplary embodiment of this application is shown. The mobile communication system includes a network device 110 and a terminal device 120, and may or may not include a terminal device 130; this application does not limit this.

[0098] The network device 110 in this application provides wireless communication functionality. This network device 110 includes, but is not limited to: an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a Home Evolved Node B (or Home Node B, HNB), a Base Band Unit (BBU), an Access Point (AP) in a Wireless Fidelity (Wi-Fi) system, a wireless relay node, a wireless backhaul node, a Transmission Point (TP), or a Transmission and Reception Point (TRP), etc. It can also support next-generation Node Bs in 5G mobile communication systems. B, gNB) or transmission point (TRP or TP), or, in a 5G system, one or a group of antenna panels (including multiple antenna panels) of a base station, or, network nodes constituting a gNB or transmission point, such as baseband unit (BBU) or distributed unit (DU), or base stations in Beyond Fifth Generation (B5G) or 6th Generation (6G) mobile communication systems, or core network (CN), fronthaul, backhaul, radio access network (RAN), network slicing, etc., or serving cell, primary cell (PCell), primary secondary cell (PSCell), special cell (SpCell), secondary cell (SCell), neighboring cell, etc. of terminal equipment.

[0099] The terminal equipment 120 in this application is also referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent, or user device. This terminal includes, but is not limited to: handheld devices, wearable devices, in-vehicle devices, and IoT devices, such as: mobile phones, tablets, e-readers, laptops, desktop computers, televisions, game consoles, mobile internet devices (MID), augmented reality (AR) terminals, virtual reality (VR) terminals, mixed reality (MR) terminals, extended reality (XR) terminals, baffle reality (BR) terminals, cinematic reality (CR) terminals, deceive reality (DR) terminals, wearable devices, controllers, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and wireless terminals in remote surgery. Wireless terminals, cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), Set-Top Boxes (STBs), and Customer Premise Equipment (CPEs) are all examples of devices used in medical surgery.

[0100] In some embodiments, network device 110 and terminal device 120 communicate with each other through some air interface technology, such as the Uu interface.

[0101] For example, there are two communication scenarios between network device 110 and terminal device 120: uplink communication scenario and downlink communication scenario. Uplink communication, or uplink transmission, refers to sending signals or data to network device 110; downlink communication, or downlink transmission, refers to sending signals or data to terminal device 120.

[0102] In some embodiments, terminal device 120 and terminal device 130 communicate with each other through some air interface technology, such as the PC5 interface.

[0103] For example, there are two communication scenarios between terminal device 120 and terminal device 130: a first side-by-side communication scenario and a second side-by-side communication scenario. The first side-by-side communication refers to terminal device 120 sending signals to terminal device 130; the second side-by-side communication refers to terminal device 130 sending signals to terminal device 120.

[0104] In some embodiments, terminal device 120 and terminal device 130 are both within network coverage and located in the same cell, or terminal device 120 and terminal device 130 are both within network coverage but located in different cells, or terminal device 120 is within network coverage but terminal device 130 is outside network coverage.

[0105] In some embodiments of this application, "NR" may also be referred to as a 5G NR system or a 5G system. The 5G mobile communication system may include non-standalone (NSA) and / or standalone (SA) networking.

[0106] The technical solutions provided in the embodiments of this application can also be applied to Machine Type Communication (MTC), Long Term Evolution-Machine (LTE-M) technology, Device to Device (D2D) networks, Machine to Machine (M2M) networks, Internet of Things (IoT) networks, or other networks. Among them, IoT networks may include, for example, vehicle-to-everything (V2X) networks. The communication methods in V2X systems are collectively referred to as Vehicle to X (V2X), where X can represent anything. For example, V2X may include: Vehicle to Vehicle (V2V) communication, Vehicle to Infrastructure (V2I) communication, Vehicle to Pedestrian (V2P) communication, or Vehicle to Network (V2N) communication, etc.

[0107] The mobile communication system provided in this application embodiment can be applied to at least one of the following communication scenarios: uplink communication scenario, downlink communication scenario, and sidelink communication scenario.

[0108] Figure 5 A flowchart illustrating a random access channel transmission method provided in an exemplary embodiment of this application is shown. The method is performed by the aforementioned terminal device and includes:

[0109] Step 230: Send the random access channel according to the relevant parameters of the random access channel when it is transmitted in the first type of time domain resources and / or the relevant parameters when it is transmitted in the second type of time domain resources.

[0110] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific type of time-domain resources is not limited in the embodiments of this application.

[0111] In some embodiments, the first type of time-domain resources and the second type of time-domain resources can be understood as two different duplex modes, time slots, or symbols, etc. The number, location, size, and frequency bandwidth of available uplink resources in the first type of time-domain resources and the second type of time-domain resources are different; or, in other words, the number, location, size, and frequency bandwidth of random access channels in the first type of time-domain resources and the second type of time-domain resources are different. For example, the first type of time-domain resources may be SBFD symbols, and the second type of time-domain resources may be non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0112] In some embodiments, the relevant parameters include at least one of the following: transmit power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; power ramp step size of random access channel; first parameter, which indicates the number of frequency division multiplexing random access channel transmission opportunities in one time unit, such as one time unit being a time instance; second parameter, which indicates the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, the reference point being the PRB0 of the uplink BWP, i.e., the starting PRB of the uplink BWP. Specifically, the transmit power indicates how much energy the terminal device will use to transmit the random access channel; the target power level indicates the target power of the random access channel desired by the network device's receiver; the power ramp counter indicates the number of power ramps, and generally, the power ramp counter increments by 1 after each random access failure; the random access preamble transmission counter indicates the number of preamble transmissions during the random access process, i.e., the number of times the random access channel is transmitted; the maximum number of random access preamble transmissions indicates the maximum number of preamble transmissions during the entire random access process, i.e., the maximum number of times the random access channel is transmitted; and the power ramp step size of the random access channel indicates the amount of power increase during each power ramp.

[0113] For example, such as Figure 6 As shown, the slashed square 10 represents a random access channel transmission opportunity, with the first parameter being 2, indicating that the number of frequency division multiplexing random access channel transmission opportunities in one time unit is 2; if the reference point is the PRB0 of the active UL BWP (active uplink BWP), that is, the starting PRB of the active UL BWP, then Figure 6 The offset between the lowest random access channel transmission opportunity in the frequency domain and PRB0 is the second parameter.

[0114] In some embodiments, the relevant parameters of the random access channel during transmission include power-related parameters and / or frequency-related parameters.

[0115] In some embodiments, a random access channel (RID) transmission opportunity is valid if: the RID transmission opportunity is within an uplink symbol; or, the RID transmission opportunity is within a first type of time-domain resource and located within a first frequency-domain bandwidth, for example, the RID transmission opportunity is within a first type of time-domain resource and located at the intersection of the uplink subband and the uplink BWP. Here, the first type of time-domain resource is an SBFD symbol; a RID transmission opportunity being within an uplink symbol means that the symbols containing the RID transmission opportunity are all uplink symbols; a RID transmission opportunity being within a first type of time-domain resource means that the symbols containing the RID transmission opportunity are all SBFD symbols; that is, if a RID transmission opportunity is located in symbols that include both uplink symbols and SBFD symbols, then this RID transmission opportunity is invalid.

[0116] In some embodiments, the first frequency domain bandwidth is a subset of the available uplink bandwidth configured by the network device for the terminal device; the first frequency domain bandwidth is the actual available uplink bandwidth determined in the uplink BWP of the terminal device based on the first duplex mode or the first type of time domain resource. The first duplex mode or the first type of time domain resource may be SBFD.

[0117] In some embodiments, the uplink BWP is an uplink BWP activated for uplink transmission of the terminal device. The first frequency domain bandwidth is the total bandwidth or a portion of the bandwidth of the uplink BWP. Due to the different available uplink subbands in different duplex modes or different time domain resource types, the first frequency domain bandwidth may be dynamically changing even for the same terminal device.

[0118] In some embodiments, the first frequency domain bandwidth can be understood as the available subband, available uplink subband, actual available subband, or actual available uplink subband in the uplink BWP.

[0119] In summary, the method provided in this application embodiment allows the terminal device to send a random access channel based on the relevant parameters when transmitting in the first type of time domain resource and / or the relevant parameters when transmitting in the second type of time domain resource. That is, the terminal device can determine the relevant parameters used for transmission under each type of time domain resource for different time domain resource types, and send the random access channel based on the relevant parameters.

[0120] 1. First frequency domain bandwidth

[0121] In an optional embodiment, the first frequency domain bandwidth is a portion of the available subband within the uplink BWP. The first frequency domain bandwidth is the actual available uplink bandwidth of the terminal device. The first frequency domain bandwidth includes at least one of the following:

[0122] • Upward sub-band;

[0123] • Upward BWP;

[0124] • Actual subband;

[0125] • The intersection of the uplink subband and the uplink BWP;

[0126] • The true uplink subband is the intersection of the uplink subband (also called the nominal subband) and the uplink BWP.

[0127] • True uplink BWP, which is the intersection of uplink subband and uplink BWP;

[0128] • The upstream sub-band portion within the upstream BWP;

[0129] • Available uplink subband portion within the uplink BWP;

[0130] • The uplink subband portion of the uplink BWP within the first type of time-domain resource;

[0131] • Available uplink subband portion in the uplink BWP within the first type of time domain resource.

[0132] In some embodiments, the first frequency domain bandwidth is the intersection of the second and third frequency domain bandwidths. The second frequency domain bandwidth is the active uplink bandwidth configured for the terminal device by the network device or communication protocol; the third frequency domain bandwidth is the uplink subband in the currently used duplex mode or time-domain resource type, typically determined by the relevant configuration of the cellular communication system. The intersection of the second and third frequency domain bandwidths is the actual available uplink bandwidth of the terminal device, i.e., the first frequency domain bandwidth.

[0133] The second frequency domain bandwidth can be referred to as uplink BWP, uplink bandwidth, active uplink BWP, active BWP, active uplink bandwidth, etc. The third frequency domain bandwidth can be referred to as sub-band, uplink sub-band, nominal uplink sub-band, uplink sub-band within the frame structure, uplink sub-band within the first type of time domain resource, etc. The first type of time domain resource is a time domain resource type that includes uplink sub-bands and / or downlink sub-bands. For example, the first type of time domain resource is at least one of SBFD symbol, SBFD slot, and SBFD subframe.

[0134] The second frequency domain bandwidth is the uplink BWP, the third frequency domain bandwidth is the uplink sub-band, and the first frequency domain bandwidth is the intersection of the uplink sub-band and the uplink BWP. Since the positions of the uplink BWP and the uplink sub-band can have multiple possibilities, an example is shown below:

[0135] like Figure 7 As shown, in some examples, the uplink subband falls entirely within the uplink BWP, and the first frequency domain bandwidth is the frequency domain bandwidth corresponding to the uplink subband.

[0136] like Figure 8 As shown, in some embodiments, the uplink subband does not fall completely within the uplink BWP, and the first frequency domain bandwidth is the intersection of the uplink subband and the uplink BWP.

[0137] like Figure 9 As shown, in some embodiments, the uplink subband and the uplink BWP are exactly the same, and the first frequency domain bandwidth is the frequency domain bandwidth corresponding to the uplink subband or the uplink BWP.

[0138] In some embodiments, the relevant parameters of the random access channel during transmission include power-related parameters and / or frequency-domain related parameters. The power-related parameters and frequency-domain related parameters will be described in detail below.

[0139] 2.1 Power-related parameters.

[0140] Power-related parameters include at least one of the following: transmit power; target power level; power ramp counter value; random access preamble transmission counter value; maximum number of random access preamble transmissions; and power ramp step size of the random access channel.

[0141] First, two methods for calculating transmission power are shown.

[0142] Method 1 for calculating transmission power:

[0143] In some embodiments, the target power level includes a first target power level and a second target power level, a first type of time-domain resource corresponds to the first target power level, and a second type of time-domain resource corresponds to the second target power level; when the random access channel transmission opportunity corresponds to the first type of time-domain resource, a random access channel is transmitted, and the first transmission power of the random access channel is determined based on the first target power level; and / or, when the random access channel transmission opportunity corresponds to the second type of time-domain resource, a random access channel is transmitted, and the second transmission power of the random access channel is determined based on the second target power level. That is, when the random access channel transmission opportunity used in this transmission corresponds to the first type of time-domain resource, a random access channel is transmitted, and the first transmission power of the random access channel is determined based on the first target power level; and / or, when the random access channel transmission opportunity used in this transmission corresponds to the second type of time-domain resource, a random access channel is transmitted, and the second transmission power of the random access channel is determined based on the second target power level.

[0144] In some embodiments, the first transmit power is determined based on at least one of a first target power level, a power ramp step size, a power ramp counter, and a preamble increment; the second transmit power is determined based on at least one of a second target power level, a power ramp step size, a power ramp counter, and a preamble increment; wherein the preamble increment is determined based on at least one of a random access preamble format and a subcarrier spacing.

[0145] In some embodiments, the first transmit power is the sum of a first target power level, a power ramp-up amount, and a preamble increment; the second transmit power is the sum of a second target power level, a power ramp-up amount, and a preamble increment; the power ramp-up amount is determined based on a power ramp-up counter and a power ramp-up step size.

[0146] For example, the target power level includes a first target power level and a second target power level. The first type of time-domain resource corresponds to the first target power level, and the second type of time-domain resource corresponds to the second target power level. The maximum number of transmissions of the random access preamble, the power ramp-up step size of the random access channel, and the preamble increment are additionally configured by the network device or agreed upon by the communication protocol. That is, the relevant parameters {maximum number of transmissions of the random access preamble, power ramp-up step size of the random access channel, and preamble increment} for the first type of time-domain resource and the second type of time-domain resource are the same. The first type of time-domain resource is an SBFD symbol, and the second type of time-domain resource is a non-SBFD symbol. The first target power level is denoted as preambleReceivedTargetPowerSBFD, the second target power level is denoted as preambleReceivedTargetPower-nonSBFD, the power ramp-up step size corresponding to the first type of time-domain resource and the second type of time-domain resource is denoted as PREAMBLE_POWER_RAMPING_STEP, and the preamble increment corresponding to the first type of time-domain resource and the second type of time-domain resource is denoted as DELTA_PREAMBLE. The formulas for calculating the first transmission power and the second transmission power are as follows.

[0147] First transmit power = preambleReceivedTargetPowerSBFD + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0148] Second transmit power = preambleReceivedTargetPower - nonSBFD + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0149] In some embodiments, the first target power level may be the same as or different from the second target power level.

[0150] In summary, the method provided in this application illustrates how to calculate the first transmission power of a random access channel when transmitting on the first type of time-domain resource and the second transmission power of a random access channel when transmitting on the second type of time-domain resource, when the first type of time-domain resource corresponds to a first target power level and the second type of time-domain resource corresponds to a second target power level. This method can determine different transmission powers of the random access channel when transmitting on different types of time-domain resources through different relevant parameters. Furthermore, since the interference experienced by the terminal device in the transmission of symbols on the first type of time-domain resource and the second type of time-domain resource is different, the link quality in the symbols of different resource types is also different. Using different transmission powers can cope with different interference situations, ensuring that the channel can be correctly received when it reaches the receiver of the network device.

[0151] Method 2 for calculating transmission power:

[0152] In some embodiments, the first type of time-domain resource corresponds to at least one of a first power ramp-up counter, a first random access preamble transmission counter, and a first power ramp-up step size; the second type of time-domain resource corresponds to at least one of a second power ramp-up counter, a second random access preamble transmission counter, and a second power ramp-up step size. That is, the terminal device maintains at least one of a power ramp-up counter and a random access preamble transmission counter for the first type of time-domain resource and the second type of time-domain resource, respectively.

[0153] In some embodiments, when the random access channel transmission opportunity corresponds to a first type of time-domain resource, a random access channel is transmitted, and the first transmission power of the random access channel is determined based on at least one of a first target power level and a first power ramp-up counter; and / or, when the random access channel transmission opportunity corresponds to a second type of time-domain resource, a random access channel is transmitted, and the second transmission power of the random access channel is determined based on at least one of a second target power level and a second power ramp-up counter. That is, when the random access channel transmission opportunity used in this transmission corresponds to a first type of time-domain resource, a random access channel is transmitted, and the first transmission power of the random access channel is determined based on at least one of a first target power level and a first power ramp-up counter; and / or, when the random access channel transmission opportunity used in this transmission corresponds to a second type of time-domain resource, a random access channel is transmitted, and the second transmission power of the random access channel is determined based on at least one of a second target power level and a second power ramp-up counter. For example, a random access channel transmission opportunity corresponding to a first type of time-domain resource can be understood as the time-domain resource where the random access channel transmission opportunity is located belonging to the first type of time-domain resource; a random access channel transmission opportunity corresponding to a first type of time-domain resource can be understood as the time-domain resource where the random access channel transmission opportunity is located belonging to the second type of time-domain resource. For example, the first type of time-domain resource corresponds to a first power ramp-up counter, and the second type of time-domain resource corresponds to a second power ramp-up counter, but the first type of time-domain resource and the second type of time-domain resource share the same target power level; another example is that the first type of time-domain resource corresponds to a first target power level, and the second type of time-domain resource corresponds to a second target power level, but the first type of time-domain resource and the second type of time-domain resource share the same power ramp-up counter. Yet another example is that the first type of time-domain resource corresponds to a first target power level and a first power ramp-up counter, and the second type of time-domain resource corresponds to a second target power level and a second power ramp-up counter.

[0154] In some embodiments, when the random access channel transmission opportunity corresponds to a first type of time-domain resource, a random access channel is transmitted, and the first transmission power of the random access channel is determined based on the value of a first power ramp-up counter; when the random access channel transmission opportunity corresponds to a second type of time-domain resource, a random access channel is transmitted, and the value of a second power ramp-up counter of the random access channel is determined. Alternatively, when the random access channel transmission opportunity corresponds to a first type of time-domain resource, a random access channel is transmitted, and the first transmission power of the random access channel is determined based on a first target power level and a first power ramp-up step size; when the random access channel transmission opportunity corresponds to a second type of time-domain resource, a random access channel is transmitted, and the second transmission power of the random access channel is determined based on a second target power level and a second power ramp-up step size. Alternatively, if the random access channel transmission opportunity corresponds to the first type of time domain resource, a random access channel is transmitted, and the first transmission power of the random access channel is determined based on the first target power level, the value of the first power ramp counter, and the first power ramp step size; if the random access channel transmission opportunity corresponds to the second type of time domain resource, a random access channel is transmitted, and the second transmission power of the random access channel is determined based on the second target power level, the value of the second power ramp counter, and the second power ramp step size.

[0155] In some embodiments, the first transmit power is determined based on at least one of a first target power level, a first power ramp step size, a value of a first power ramp counter, and a preamble increment; the second transmit power is determined based on at least one of a second target power level, a second power ramp step size, a value of a second power ramp counter, and a preamble increment; wherein the preamble increment is determined based on at least one of a random access preamble format and a subcarrier spacing.

[0156] In some embodiments, the first transmit power is the sum of a first target power level, a first power ramp-up amount, and a preamble increment, wherein the first power ramp-up amount is determined based on the value of a first power ramp-up counter and a first power ramp-up step size; the second transmit power is the sum of a second target power level, a second power ramp-up amount, and a preamble increment, wherein the second power ramp-up amount is determined based on the value of a second power ramp-up counter and a second power ramp-up step size.

[0157] For example, the target power level includes a first target power level and a second target power level; the power ramp step includes a first power ramp step and a second power ramp step; the power ramp counter includes a first power ramp counter and a second power ramp counter. The preamble increment is additionally configured by the network device or agreed upon by the communication protocol. The first type of time-domain resource is an SBFD symbol, and the second type of time-domain resource is a non-SBFD symbol. The first target power level is denoted as `preambleReceivedTargetPowerSBFD`, and the second target power level is denoted as `preambleReceivedTargetPower-nonSBFD`. The first power ramp-up counter is denoted as `PREAMBLE_POWER_RAMPING_COUNTER_SBFD`, and the second power ramp-up counter is denoted as `PREAMBLE_POWER_RAMPING_COUNTER_nonSBFD`. The first power ramp-up step size is denoted as `PREAMBLE_POWER_RAMPING_STEP_SBFD`, and the second power ramp-up step size is denoted as `PREAMBLE_POWER_RAMPING_STEP_nonSBFD`. The preamble increment corresponding to the first and second type of time-domain resources is denoted as `DELTA_PREAMBLE`. The formulas for calculating the first and second transmit powers are as follows.

[0158] First transmit power = preambleReceivedTargetPowerSBFD + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER_SBFD – 1) × PREAMBLE_POWER_RAMPING_STEP_SBFD.

[0159] Second transmit power = preambleReceivedTargetPower - nonSBFD + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER_nonSBFD – 1) × PREAMBLE_POWER_RAMPING_STEP_nonSBFD.

[0160] In some embodiments, the first target power level may be the same as or different from the second target power level; the first power transfer counter may be the same as or different from the second power transfer counter.

[0161] In summary, the method provided in this application illustrates a method for calculating the first transmission power of a random access channel when transmitting on a first type of time-domain resource, and a method for calculating the second transmission power of a random access channel when transmitting on a second type of time-domain resource, where the first type of time-domain resource corresponds to at least one of a first target power level, a first power ramp-up counter, and a first power ramp-up step size, and the second type of time-domain resource corresponds to at least one of a second target power level, a second power ramp-up counter, and a second power ramp-up step size. This method can determine different transmission powers of the random access channel when transmitting on different types of time-domain resources through different relevant parameters. Furthermore, since the interference experienced by the terminal device in the transmission of symbols on the first type of time-domain resource and the second type of time-domain resource is different, the link quality in the symbols of different resource types is also different. Using different transmission powers can cope with different interference situations, ensuring that the channel can be correctly received when it reaches the receiver of the network device.

[0162] In some embodiments, since the type of time-domain resources used by the terminal device in the transmission of the random access channel is uncertain, the type of time-domain resources used in the current transmission may be the same as or different from the type of time-domain resources used in the previous transmission during the random access process. Therefore, the following describes different ramp-up methods of the power ramp-up counter for the cases where the type of time-domain resources used in the current transmission is the same as or different from the type of time-domain resources used in the previous transmission.

[0163] In some embodiments, the time-domain resource type used in this transmission being different from the time-domain resource type used in the previous transmission can be represented as the time-domain resource type used in this transmission being a first type of time-domain resource, and the time-domain resource type used in the previous transmission being a second type of time-domain resource; and / or, the time-domain resource type used in this transmission being a second type of time-domain resource, and the time-domain resource type used in the previous transmission being a first type of time-domain resource. For example, if the first type of time domain resource is an SBFD symbol and the second type of time domain resource is a non-SBFD symbol, due to the more severe interference in SBFD links, when the first and second type of time domain resources share the same power ramp-up counter, the power ramp-up counter remains unchanged, is reset, or is initialized when transitioning from a non-SBFD symbol to an SBFD symbol (i.e., the time domain resource type used in the current transmission is an SBFD symbol, while the time domain resource type used in the previous transmission was a non-SBFD symbol). When transitioning from an SBFD symbol to a non-SBFD symbol (i.e., the time domain resource type used in the current transmission is a non-SBFD symbol, while the time domain resource type used in the previous transmission was an SBFD symbol), the power ramp-up counter is incremented by 1. Optionally, the power ramp-up counter is incremented by 1 if the time domain resource type used in the current transmission is the same as that used in the previous transmission.

[0164] In some embodiments, the difference between the time-domain resource type used in this transmission and the time-domain resource type used in the previous transmission may only include the fact that the time-domain resource type used in this transmission is a first type of time-domain resource, while the time-domain resource type used in the previous transmission was a second type of time-domain resource. In some embodiments, the difference between the time-domain resource type used in this transmission and the time-domain resource type used in the previous transmission may only include the fact that the time-domain resource type used in this transmission is a second type of time-domain resource, while the time-domain resource type used in the previous transmission was a first type of time-domain resource.

[0165] Climbing mode 1: Power climb counter remains unchanged.

[0166] During transmission on the random access channel, the terminal device uses only one power ramp-up counter for both the first type and the second type of time-domain resources. For random access channel transmission, if the corresponding time-domain resource type changes compared to the previous transmission, the power ramp-up counter remains unchanged; or, if the time-domain resource type used in the current transmission of the random access channel changes compared to the time-domain resource type used in the previous transmission, the power ramp-up counter remains unchanged. It should be noted that "keeping the power ramp-up counter unchanged when the time-domain resource type used in the current transmission of the random access channel changes compared to the time-domain resource type used in the previous transmission" is a different expression of the same meaning as "keeping the power ramp-up counter unchanged when the time-domain resource type used in the current transmission of the random access channel changes compared to the time-domain resource type used in the previous transmission." In other words, "keeping the power ramp-up counter unchanged when the time-domain resource type used in the current transmission of the random access channel changes compared to the time-domain resource type used in the previous transmission" is equivalent to "keeping the power ramp-up counter unchanged when the time-domain resource type used in the current transmission of the random access channel changes compared to the time-domain resource type used in the previous transmission." For example, if there are n random access transmissions, and the time-domain resource type corresponding to the random access channel transmission opportunity used in the i-th transmission is different from the time-domain resource type corresponding to the random access channel transmission opportunity used in the (i-1)-th transmission, then the power ramp-up counter of the random access channel used in the i-th transmission remains unchanged compared to the power ramp-up counter of the random access channel used in the (i-1)-th transmission.

[0167] In some embodiments, for random access channel transmissions, if the corresponding time-domain resource type changes compared to the initial transmission, the power ramp-up counter remains unchanged; or, if the time-domain resource type used in the current transmission of the random access channel changes compared to the time-domain resource type used in the initial transmission, the power ramp-up counter remains unchanged. For example, if there are n random access transmissions, and the time-domain resource type corresponding to the random access channel transmission opportunity used in the i-th transmission is different from the time-domain resource type corresponding to the random access channel transmission opportunity used in the initial transmission, then the power ramp-up counter of the random access channel used in the i-th transmission remains unchanged compared to the power ramp-up counter of the random access channel used in the (i-1)-th transmission. That is, for random access channel retransmissions, if the corresponding time-domain resource type changes compared to the previous transmission or the initial transmission, the power ramp-up counter remains unchanged.

[0168] For example, such as Figure 10As shown, during the initial transmission, the first retransmission, and the second retransmission, the time-domain resource type used is the first type of time-domain resource. The power ramp-up counter increments by 1 for each retransmission. Optionally, the power ramp-up counter is initialized to 1 during the initial transmission. That is, the power ramp-up counter is 1 during the initial transmission. During the first retransmission, since the time-domain resource type corresponding to the random access channel transmission opportunity 12 used in the first retransmission is the same as the time-domain resource type corresponding to the random access channel transmission opportunity 11 used in the previous transmission (i.e., the initial transmission) is the first type of time-domain resource, the power ramp-up counter increments by 1, and the power ramp-up counter is now 2. During the second retransmission, since the time-domain resource type corresponding to the random access channel transmission opportunity 13 used in the second retransmission is the same as the time-domain resource type corresponding to the random access channel transmission opportunity 12 used in the previous transmission (i.e., the first retransmission) is the first type of time-domain resource, the power ramp-up counter increments by 1, and the power ramp-up counter is now 3. During the third retransmission, since the time-domain resource type corresponding to random access channel transmission opportunity 14 used in the third retransmission is type II time-domain resource, which is different from the time-domain resource type corresponding to random access channel transmission opportunity 13 used in the previous transmission (the second retransmission), the power ramp-up counter remains unchanged, i.e., the power ramp-up counter is still 3 during the third retransmission. During the fourth retransmission, since the time-domain resource type corresponding to random access channel transmission opportunity 15 used in the fourth retransmission is the same as the time-domain resource type corresponding to random access channel transmission opportunity 14 used in the previous transmission (the third retransmission), both being type II time-domain resources, the power ramp-up counter increments by 1, and the power ramp-up counter is now 4.

[0169] In summary, the method provided in this application keeps the power ramp-up counter unchanged when the time-domain resource type used during random access channel transmission is different from the time-domain resource type used in the previous transmission. This method of calculating transmission power takes into account both the interference level and the delay of random access.

[0170] Climbing Method 2: Power Climbing Counter Reset or Initialization.

[0171] During transmission on the random access channel, the terminal device uses only one power ramp-up counter for both the first type of time-domain resources and the second type of time-domain resources. For random access channel transmission, if the corresponding time-domain resource type changes compared to the previous transmission, the power ramp-up counter is reset or initialized; or, if the time-domain resource type used in the current transmission of the random access channel changes compared to the time-domain resource type used in the previous transmission, the power ramp-up counter is reset or initialized. It should be noted that "resetting or initializing the power ramp-up counter when the time-domain resource type used in the current transmission of the random access channel changes compared to the time-domain resource type used in the previous transmission" is a different expression of the same meaning as "resetting or initializing the power ramp-up counter when the time-domain resource type used in the current transmission of the random access channel changes compared to the previous transmission." In other words, "resetting or initializing the power ramp-up counter when the time-domain resource type used in the current transmission of the random access channel changes compared to the previous transmission" is equivalent to "resetting or initializing the power ramp-up counter when the time-domain resource type used in the current transmission of the random access channel changes compared to the previous transmission." For example, if there are n random access transmissions, and the time-domain resource type corresponding to the random access channel transmission opportunity used in the i-th transmission is different from the time-domain resource type corresponding to the random access channel transmission opportunity used in the (i-1)-th transmission, then the power ramp-up counter of the random access channel used in the i-th transmission is reset or initialized.

[0172] In some embodiments, for random access channel transmissions, if the corresponding time-domain resource type changes compared to the initial transmission, the power ramp-up counter is reset or initialized; or, if the time-domain resource type used in the current transmission of the random access channel changes compared to the time-domain resource type used in the initial transmission, the power ramp-up counter is reset or initialized. For example, if there are n random access transmissions, and the time-domain resource type corresponding to the random access channel transmission opportunity used in the i-th transmission is different from the time-domain resource type corresponding to the random access channel transmission opportunity used in the initial transmission, then the power ramp-up counter of the random access channel used in the i-th transmission is reset or initialized. That is, for random access channel retransmissions, if the corresponding time-domain resource type changes compared to the previous transmission or the initial transmission, the power ramp-up counter is reset or initialized.

[0173] For example, such as Figure 11As shown, during the initial transmission, the first retransmission, and the second retransmission, the time-domain resource type used is the first type of time-domain resource. The power ramp-up counter increments by 1 for each retransmission. Optionally, during the initial transmission, the power ramp-up counter is initialized to 1. That is, during the initial transmission, the power ramp-up counter is 1; during the first retransmission, since the time-domain resource type corresponding to the random access channel transmission opportunity 17 used in the first retransmission is the same as the time-domain resource type corresponding to the random access channel transmission opportunity 16 used in the previous transmission (i.e., the initial transmission) is the first type of time-domain resource, the power ramp-up counter increments by 1, and the power ramp-up counter is now 2; during the second retransmission, since the time-domain resource type corresponding to the random access channel transmission opportunity 18 used in the second retransmission is the same as the time-domain resource type corresponding to the random access channel transmission opportunity 17 used in the previous transmission (i.e., the first retransmission) is the first type of time-domain resource, the power ramp-up counter increments by 1, and the power ramp-up counter is now 3. During the third retransmission, since the time-domain resource type corresponding to the random access channel transmission opportunity 19 used in the third retransmission is type II time-domain resource, which is different from the time-domain resource type corresponding to the random access channel transmission opportunity 18 used in the previous transmission (the second retransmission), the power ramp-up counter is reset or initialized at this time, for example, the power ramp-up counter is reset to 1, that is, the power ramp-up counter is reset to 1 during the third retransmission. During the fourth retransmission, since the time-domain resource type corresponding to the random access channel transmission opportunity 20 used in the fourth retransmission is the same as the time-domain resource type corresponding to the random access channel transmission opportunity 19 used in the previous transmission (the third retransmission), which is type II time-domain resource, the power ramp-up counter is incremented by 1, and the power ramp-up counter is now 2.

[0174] In summary, the method provided in this application resets or initializes the power ramp-up counter when the time-domain resource type used during random access channel transmission is different from the time-domain resource type used in the previous transmission. This method of calculating transmission power can minimize the interference to other links caused by the random access process performed after the change of time-domain resource type. However, resetting or initializing the power ramp-up counter may cause the UE to need to perform multiple retransmissions, i.e., power ramp-up, in order to achieve the transmission power required to successfully complete random access, which may lead to an increase in random access latency.

[0175] Rise Mode 3: The power ramp counters corresponding to the first type of time domain resources and the second type of time domain resources are different.

[0176] During transmission through the random access channel, the terminal device uses a power ramp-up counter for the first type of time domain resource and a power ramp-up counter for the second type of time domain resource. The first power ramp-up counter is used for the first type of time domain resource, and the second power ramp-up counter is used for the second type of time domain resource. During transmission, the corresponding power ramp-up counter is selected according to the type of time domain resource used during transmission.

[0177] In some embodiments, the terminal device further uses a random access preamble transmission counter for the first type of time domain resource and a random access preamble transmission counter for the second type of time domain resource. The first random access preamble transmission counter is used for the first type of time domain resource, and the second random access preamble transmission counter is used for the second type of time domain resource. During transmission, the corresponding power ramp-up counter is selected according to the type of time domain resource used during transmission.

[0178] That is, the first type of time-domain resource corresponds to at least one of the first power ramp-up counter and the first random access preamble transmission counter; the second type of time-domain resource corresponds to at least one of the second power ramp-up counter and the second random access preamble transmission counter.

[0179] In some embodiments, when the random access procedure is initiated, at least one of a first power ramp-up counter, a first random access preamble transmission counter, a second power ramp-up counter, and a second random access preamble transmission counter is initialized. If the random access channel transmission fails and the random access channel corresponds to a first type of time-domain resource, the first random access preamble transmission counter is incremented by 1. If the random access channel transmission fails and the random access channel corresponds to a second type of time-domain resource, the second random access preamble transmission counter is incremented by 1. If the random access channel corresponds to a first type of time-domain resource and the value of the first random access preamble transmission counter is greater than the first initial value, the first power ramp-up counter is incremented by 1. If the random access channel corresponds to a second type of time-domain resource and the value of the second random access preamble transmission counter is greater than the second initial value, the second power ramp-up counter is incremented by 1. Here, a random access channel transmission failure is indicated by the following: if the RAR window times out but no random access response containing the first random access preamble identifier is received, or if contention resolution is unsuccessful, the random access channel transmission is considered to have failed. The first random access preamble identifier matches the random access channel preamble index (PRACH preamble index) sent by the terminal.

[0180] In some embodiments, the first power ramp-up counter and / or the second power ramp-up counter are updated before the random access channel transmission; the first random access preamble transmission counter and / or the second random access preamble transmission counter are updated after the random access channel transmission.

[0181] For example, such as Figure 12As shown, when the random access process starts, the first power ramp-up counter, the first random access preamble transmission counter, the second power ramp-up counter, and the second random access preamble transmission counter are all initialized to 1. During the initial transmission, since the time-domain resource type corresponding to the random access channel transmission opportunity 21 used in the initial transmission is the first type of time-domain resource, but the first random access preamble transmission counter is 1, which is the first initial value, the first power ramp-up counter remains unchanged. In other words, since the first type of time-domain resource is used for the first time, the first power ramp-up counter is initialized to 1. At this time, the first power ramp-up counter is 1. After the initial transmission ends, due to the initial transmission failure and the random access used in the initial transmission... When the time-domain resource type corresponding to channel transmission opportunity 21 is the first type of time-domain resource, the first random access preamble transmission counter is incremented by 1, and the first random access preamble counter is 2. During the first retransmission, since the time-domain resource type corresponding to the random access channel transmission opportunity 22 used for the first retransmission is the first type of time-domain resource, and the first random access preamble transmission counter is greater than the first initial value, the first power ramp-up counter is incremented by 1, and the first power ramp-up counter is 2. After the first retransmission ends, since the first retransmission failed and the time-domain resource type corresponding to the random access channel transmission opportunity 22 used for the first retransmission is the first resource type, the first random access preamble... The code transmission counter is incremented by 1, at which point the first random access preamble transmission counter is 3. During the second retransmission, since the time-domain resource type corresponding to the random access channel transmission opportunity 23 used in the second retransmission is the second type of time-domain resource, but the second random access preamble transmission counter is 1, i.e., the second initial value, the second power ramp-up counter remains unchanged. In other words, since the second power ramp-up counter was initialized when the second type of time-domain resource was used for the first time, the second power ramp-up counter is 1 at this time. After the second retransmission ends, since the second retransmission fails and the time-domain resource type corresponding to the random access channel transmission opportunity 23 used in the second retransmission is the second type of time-domain resource, the second random access preamble transmission counter is incremented by 1. The second random access preamble transmission counter is incremented by 1, and the second random access preamble transmission counter is 2. During the third retransmission, since the time domain resource type corresponding to the random access channel transmission opportunity 24 used for the third retransmission is the second type of time domain resource, and the second random access preamble transmission counter is greater than the second initial value, the second power ramp-up counter is incremented by 1, and the second power ramp-up counter is 2. After the second retransmission ends, since the second retransmission fails and the time domain resource type corresponding to the random access channel transmission opportunity 24 used for the second retransmission is the second resource type, the second random access preamble transmission counter is incremented by 1, and the second random access preamble transmission counter is 3.During the fourth retransmission, because the time-domain resource type corresponding to the random access channel transmission opportunity 25 used for the fourth retransmission is the first type of time-domain resource, and the value of the first random access preamble transmission counter is greater than the first initial value, the first power ramp-up counter is incremented by 1, at which point the first power ramp-up counter is 3. After the fourth retransmission ends, because the fourth retransmission fails and the time-domain resource type corresponding to the random access channel transmission opportunity 25 used for the fourth retransmission is the first type of time-domain resource, the first random access preamble transmission counter is incremented by 1, at which point the first random access preamble transmission counter is 4.

[0182] In summary, the method provided in this application, which configures different power ramp counters for the first type of time domain resources and the second type of time domain resources, can shorten the latency of random access to a certain extent. However, since the terminal needs to maintain two sets of power ramp counters, it can easily burden the terminal device and increase the complexity of the random access process corresponding to the terminal device.

[0183] Climbing Method 4: Do not expect changes in the time-domain resource type corresponding to the random access channel.

[0184] In some embodiments, the initial transmission and retransmission of the random access channel correspond to the same time-domain resource type; or, the terminal device does not expect the retransmission of the random access channel to change the corresponding time-domain resource type relative to the initial transmission or the previous transmission; or, the terminal device does not expect the time-domain resource type corresponding to the retransmission of the random access channel to be different from the time-domain resource type corresponding to the initial transmission or the previous transmission of the random access channel. That is, when selecting the timing of random access channel transmission, the terminal device will use the same time-domain resource type as the initial transmission.

[0185] In summary, the method provided in this application embodiment always uses the same time-domain resource type during the random access process, and can also complete the random access process when there are two time-domain resource types, avoiding the problem of interference caused by switching symbol types. However, this method requires waiting for the desired time-domain resource type of random access resource, so the random access latency is relatively high.

[0186] In an optional embodiment, the above-described method for calculating and ramping up the transmission power can be implemented as an independent embodiment or a combination of embodiments. For example, the first method of calculating transmission power can be implemented independently, with the power ramp-up counter incremented by 1 when the time-domain resource type corresponding to the random access channel changes; the first method of calculating transmission power can be combined with ramp-up method one, setting the same power ramp-up counter for both the first and second types of time-domain resources, keeping the power ramp-up counter unchanged when the time-domain resource type corresponding to the random access channel changes; or, the first method of calculating transmission power can be combined with ramp-up method two, setting the same power ramp-up counter for both the first and second types of time-domain resources, resetting or initializing the power ramp-up counter when the time-domain resource type corresponding to the random access channel changes; or, the first method of calculating transmission power can be combined with ramp-up method four, setting the same power ramp-up counter for both the first and second types of time-domain resources, and using the same random access channel corresponding to the same time-domain resource type in each transmission; or, the first method of calculating transmission power can be combined with ramp-up method three, maintaining a power ramp-up counter and a random access preamble transmission for both the first and second types of time-domain resources respectively. A counter; or, a combination of the second method for calculating transmission power and the third method for ramping up, maintaining a power ramp-up counter and a random access preamble transmission counter for the first type of time domain resources and the second type of time domain resources respectively; or, a combination of the first method for calculating transmission power and the second method for calculating transmission power, wherein the first type of time domain resources corresponds to the first target power level, and the first type of time domain resources corresponds to at least one of the first power ramp-up counter, the first random access preamble transmission counter, and the first power ramp-up step size; the second type of time domain resources corresponds to the second target power level, and the second type of time domain resources corresponds to at least one of the second power ramp-up counter, the second random access preamble transmission counter, and the second power ramp-up step size; or, the first method for calculating transmission power can be combined with the fourth method for ramping up, wherein the terminal device expects the time domain resource type corresponding to each random access channel transmission to be the same, and after each random access channel transmission failure, the power ramp-up counter is incremented by 1, and the transmission power is calculated using the first method for calculating transmission power; or, the second method for calculating transmission power can be combined with the fourth method for ramping up.

[0187] 2.2 Frequency domain correlation parameters.

[0188] The frequency domain related parameters include at least one of the following parameters: a first parameter and a second parameter; the first parameter indicates the number of random access channel transmission opportunities in a frequency division multiplexing within a time unit, such as a time unit being a time instance; the second parameter indicates the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, which is the PRB0 of the uplink BWP, i.e., the starting PRB of the uplink BWP; the first parameter can be represented as msg1-FDM, and the second parameter can be represented as msg1-FrequencyStart.

[0189] In some embodiments, the first parameter corresponding to the first type of time-domain resource is the same as or different from the first parameter corresponding to the second type of time-domain resource; and / or, the second parameter corresponding to the first type of time-domain resource is the same as or different from the second parameter corresponding to the second type of time-domain resource.

[0190] For example, such as Figure 13 As shown, the first parameter corresponding to the first type of time domain resource can be denoted as msg1-FDMSBFD, the second parameter corresponding to the first type of time domain resource can be denoted as msg1-FrequencyStartSBFD, the first parameter corresponding to the second type of time domain resource can be denoted as msg1-FDMNonSBFD, and the second parameter corresponding to the second type of time domain resource can be denoted as msg1-FrequencyStartNonSBFD. Figure 13 Based on the parameters configured in the first configuration: msg1-FDMSBFD=2, msg1-FrequencyStartSBFD=N1, a set of random access channel transmission opportunities 26 located in the uplink subband is selected, which includes 4 random access channel transmission opportunities; and based on the parameters configured in the second configuration: msg1-FDMNonSBFD=4, msg1-FrequencyStartNonSBFD=N2, a set of random access channel transmission opportunities 27 is selected, which includes 8 random access channel transmission opportunities.

[0191] In summary, the method provided in this application provides frequency domain configuration for the first type of time domain resources and the second type of time domain resources respectively. This flexible approach ensures that all random access channel transmission opportunities are valid and that random access channel transmission opportunities are located at both ends of the uplink BWP or uplink subband, thereby avoiding resource fragmentation.

[0192] In some embodiments, the network device provides differentiated configurations for terminal devices for a first type of time-domain resources and / or a second type of time-domain resources. There are two configuration methods, which will be described separately below.

[0193] 3.1 Configuration Method 1.

[0194] Based on Figure 5 In an optional embodiment, the method further includes:

[0195] Step 210: Receive the first configuration and the second configuration. The first configuration and the second configuration are used to configure the relevant parameters when transmitting through the random access channel. The first configuration corresponds to the first type of time domain resource, and the second configuration corresponds to the second type of time domain resource.

[0196] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific types of time-domain resources are not limited in the embodiments of this application; typically, a first configuration corresponds to a first type of symbol, and a second configuration corresponds to a second type of symbol for illustrative purposes. For example, the first configuration corresponds to SBFD symbols, and the second configuration corresponds to non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0197] In some embodiments, the configuration of the random access channel includes at least one of a power configuration and a frequency domain configuration. The power configuration is used to configure power-related parameters during random access channel transmission, and the frequency domain configuration is used to configure frequency-related parameters during random access channel transmission. A first configuration includes at least one of a first power configuration and a first frequency domain configuration; a second configuration includes at least one of a second power configuration and a second frequency domain configuration. The configuration items included in the first configuration and the second configuration are the same; that is, if the first configuration includes the first power configuration, the second configuration should also include the second power configuration; if the first configuration includes the first frequency domain configuration, the second configuration should also include the second frequency domain configuration; if the first configuration includes both the first power configuration and the first frequency domain configuration, the second configuration should also include both the second power configuration and the second frequency domain configuration.

[0198] In some embodiments, the power configuration includes at least one of the following related parameters: target power level; maximum number of transmissions of the random access preamble; power ramp-up step size of the random access channel; that is, either the first configuration or the second configuration includes at least one of the following related parameters: target power level; maximum number of transmissions of the random access preamble; power ramp-up step size of the random access channel.

[0199] In some embodiments, power-related parameters include at least one of the following parameters: transmit power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; and power ramp step size of random access channel. The first part of the related parameters is based on additional network device configuration or protocol agreement, and the second part of the parameters is selected, calculated, or determined by the terminal device based on the first part of the parameters. For example, power-related parameters are configured using configuration method one, and either the first configuration or the second configuration includes at least one of the following parameters: target power level, maximum number of transmissions of random access preamble, and power ramp step size of random access channel.

[0200] In some embodiments, the first configuration includes a first target power level, and the second configuration includes a second target power level.

[0201] In some embodiments, the first configuration further includes a first power ramp-up step size, and the second configuration further includes a second power ramp-up step size. The first power ramp-up step size and the second power ramp-up step size may be the same as or different from each other.

[0202] In some embodiments, the first configuration further includes a first maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to the first type of time-domain resource; the second configuration further includes a second maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to the second type of time-domain resource. The first maximum number of transmissions and the second maximum number of transmissions may be the same or different.

[0203] In some embodiments, the first configuration and the second configuration include only parameters with different values. Parameters with the same values ​​in the first and second configurations can be additionally configured by the network device or agreed upon by the communication protocol. For example, the first configuration includes a first target power level, the second configuration includes a second target power level, the maximum number of transmissions of the random access preamble and the power ramp-up step size of the random access channel are additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level and a first power ramp-up step size, the second configuration includes a second target power level and a second power ramp-up step size, the maximum number of transmissions of the random access preamble is additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level and a first maximum number of transmissions, the second configuration includes a second target power level and a second maximum number of transmissions, the power ramp-up step size of the random access channel is additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level, a first maximum number of transmissions and a first power ramp-up step size, the second configuration includes a second target power level, a second maximum number of transmissions and a second power ramp-up step size.

[0204] In some embodiments, the first configuration and the second configuration include all parameters. That is, the first configuration includes a first target power level, a first maximum number of attempts, and a first power ramp-up step size, and the second configuration includes a second target power level, a second maximum number of attempts, and a second power ramp-up step size. The first maximum number of attempts may be the same as or different from the second maximum number of attempts, and the first power ramp-up step size may be the same as or different from the second power ramp-up step size.

[0205] In some embodiments, the frequency domain configuration includes at least one of the following related parameters: a first parameter indicating the number of frequency-division multiplexed random access channel transmission opportunities in a time unit; and a second parameter indicating the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, where the reference point is the PRB0 of the uplink BWP, i.e., the starting PRB of the uplink BWP. That is, either the first configuration or the second configuration includes at least one of the following related parameters: a first parameter indicating the number of frequency-division multiplexed random access channel transmission opportunities in a time unit; and a second parameter indicating the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, where the reference point is the PRB0 of the uplink BWP.

[0206] In some embodiments, the first configuration and the second configuration share some related parameters. For example, such as... Figure 14 As shown, the terminal device uses a set of power ramp-up counters and preamble transmission counters for both the first and second configurations. The shared parameters for both configurations are the power ramp-up counter and the preamble transmission counter. The first configuration includes at least one of the following: a first target power level, a first maximum number of ramps, a first power ramp-up step size, a first parameter 1, and a second parameter 1. The second configuration includes at least one of the following: a second target power level, a second maximum number of ramps, a second power ramp-up step size, a first parameter 2, and a second parameter 2. The first target power level and the second target power level are typically different. The first maximum number of ramps and the second maximum number of ramps can be the same or different; the first power ramp-up step size and the second power ramp-up step size can be the same or different; the first parameter 1 and the first parameter 2 can be the same or different; and the second parameter 1 and the second parameter 2 can be the same or different.

[0207] In some embodiments, the first configuration and the second configuration do not share related parameters. For example, such as... Figure 15As shown. The terminal device uses a power ramp-up counter and a preamble transmission counter for the first configuration and the second configuration, respectively. The first configuration includes at least one of the following: a first target power level, a first maximum number of times, a first power ramp-up step size, a first power ramp-up counter, a first preamble transmission counter, a first parameter 1, and a second parameter 1. The second configuration includes at least one of the following: a second target power level, a second maximum number of times, a second power ramp-up step size, a second power ramp-up counter, a second preamble transmission counter, a first parameter 2, and a second parameter 2. Wherein, the first target power level and the second target power level are usually different. The first maximum number of times and the second maximum number of times can be the same or different; the first power ramp-up step size and the second power ramp-up step size can be the same or different; the first power ramp-up counter and the second power ramp-up counter are usually different; the first preamble transmission counter and the second preamble transmission counter are usually different; the first parameter 1 and the first parameter 2 can be the same or different; and the second parameter 1 and the second parameter 2 can be the same or different.

[0208] In some embodiments, a first configuration parameter and a second configuration parameter are received, the first configuration parameter corresponding to a first configuration and the second configuration parameter corresponding to a second configuration; or, a first configuration parameter and an offset value are received, the first configuration parameter corresponding to the first configuration and the configuration parameter after offset based on the offset value corresponding to the second configuration; or, a second configuration parameter and an offset value are received, the second configuration parameter corresponding to the second configuration and the configuration parameter after offset based on the offset value corresponding to the first configuration; or, a first configuration parameter is received, the first configuration parameter corresponding to the first configuration; or, a second configuration parameter is received, the second configuration parameter corresponding to the second configuration. For example, the first configuration parameter includes a first target power level, and the second configuration parameter includes a second target power level; or, the first configuration includes a first target power level and the offset value includes a target power level offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset; or, the first configuration includes a first target power level and a first power ramp step size, and the offset value includes a target power level offset and a power ramp step size offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset, and the second power ramp step size corresponding to the second configuration is the sum of the first target power ramp step size and the power ramp step size offset.

[0209] In some embodiments, a portion of the relevant parameters are configured by a first configuration parameter and a second configuration parameter; another portion of the relevant parameters are configured by a first configuration parameter and an offset value; or, a first portion of the relevant parameters are configured by a first configuration parameter and a second configuration parameter, a second portion of the relevant parameters are configured by a first configuration parameter and an offset value, and a third portion of the relevant parameters are based on additional network device configuration or protocol agreement. For example, the relevant parameters include a target power level, a maximum number of transmissions of the random access preamble, and a power ramp-up step size of the random access channel; for the target power level, the first configuration parameter (i.e., the first target power level) and a second configuration parameter (i.e., the second target power level) are used for configuration; or, based on additional network device configuration or protocol agreement; or, configured by a first configuration parameter (i.e., the first target power level) and an offset value (i.e., the target power level offset); for the maximum number of transmissions of the random access preamble, the first configuration parameter (i.e., the first maximum number) and a second... The configuration parameters (i.e., the second maximum number of times) are configured; or, based on additional network device configuration or protocol agreement; or, the first configuration parameter (i.e., the first maximum number of times) and the offset value (i.e., the maximum number of times offset) are used for configuration; for the power ramp-up step size of the random access channel, the first configuration parameter (i.e., the first power ramp-up step size) and the second configuration parameter (i.e., the second power ramp-up step size) are used for configuration; or, based on additional network device configuration or protocol agreement; or, the first configuration parameter (i.e., the first power ramp-up step size) and the offset value (i.e., the power ramp-up step size offset) are used for configuration.

[0210] For example, the first configuration parameter includes a first target power level, and the second configuration parameter includes a second target power level; or, the first configuration includes a first target power level and the offset value includes a target power level offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset; or, the first configuration includes a first target power level and a first power ramp step size, and the offset value includes a target power level offset and a power ramp step size offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset, and the second power ramp step size corresponding to the second configuration is the sum of the first target power ramp step size and the power ramp step size offset.

[0211] For example, if the second configuration parameter is the second target power level, denoted as `preambleReceivedTargetPower`, and the offset value is the target power level offset, denoted as `delta_SBFD`, then the first target power level corresponding to the first configuration is `preambleReceivedTargetPower + delta_SBFD`. In this case, the calculation formulas for the first and second transmit power are as follows.

[0212] First transmit power = preambleReceivedTargetPower + delta_SBFD + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0213] Second transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0214] In an optional embodiment, the power configuration of the random access channel can also be implemented as follows: when the time-domain resource type used in the current transmission is different from the time-domain resource type used in the previous transmission, the power ramp-up counter is incremented by 1; an offset count is set and denoted as counter_SBFD. When the time-domain resource type used in the initial transmission is the first type of time-domain resource, the offset count is initialized to 1; when the time-domain resource type used in the initial transmission is the second type of time-domain resource, the offset count is initialized to 0; when the time-domain resource type used in the retransmission is the first type of time-domain resource, the offset count is incremented by 1, i.e., counter_SBFD+1. In this case, the calculation formulas for the first transmission power and the second transmission power are as follows.

[0215] First transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP + counter_SBFD × delta_SBFD.

[0216] Second transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0217] In summary, the method provided in this application provides a first configuration and a second configuration for a random access channel for a terminal device, enabling the terminal device to use the first configuration or the second configuration for random access. Since the first configuration corresponds to a first type of time-domain resource and the second configuration corresponds to a second type of time-domain resource, this allows the terminal device to select different configurations for different time-domain resource types during the random access process.

[0218] 3.2 Configuration Method Two.

[0219] Based on Figure 5 In an optional embodiment, the method includes:

[0220] Step 220: Receive the third configuration, which is used to configure relevant parameters for random access channel transmission. The third configuration corresponds to the first type of time domain resources and the second type of time domain resources.

[0221] In some embodiments, when configuring the frequency domain related parameters of the random access channel, a single configuration, namely the third configuration, can be used for both the first type of time domain resources and the second type of time domain resources.

[0222] In some embodiments, the third configuration includes a second parameter; the second parameter indicates the offset between the lowest random access channel transmission opportunity and the reference point in the frequency domain dimension. Specifically, for the first type of time-domain resource, the reference point is the lowest PRB of the first frequency domain bandwidth in the frequency domain; for the second type of time-domain resource, the reference point is the PRB0 of the uplink BWP.

[0223] In some embodiments, the third configuration further includes a first parameter, which indicates the number of frequency division multiplexing random access channel transmission opportunities in a time unit, such as a time unit being a time instance.

[0224] For example, such as Figure 16 As shown, the third configuration includes a first parameter and a second parameter. The first parameter can be denoted as msg1-FDM, and the second parameter can be denoted as msg1-FrequencyStart. Figure 16Based on the parameters msg1-FDM=2 and msg1-FrequencyStart=0 configured in the third configuration, a set of random access channel transmission opportunities 28 for the first type of time-domain resources and a set of random access channel transmission opportunities 29 for the second type of time-domain resources are selected. The set of random access channel transmission opportunities 28 includes 4 random access channel transmission opportunities, and the set of random access channel transmission opportunities 29 also includes 4 random access channel transmission opportunities. The reference point for the first type of time-domain resources is designated as reference point 30, and the reference point for the second type of time-domain resources is designated as reference point 31. Reference point 30 is the lowest PRB in the frequency domain dimension of the intersection of the uplink subband and the uplink BWP, and reference point 31 is the PRB0 of the uplink BWP.

[0225] In summary, the method provided in this application shares a single configuration for both the first and second types of time-domain resources, thus saving signaling overhead. The terminal device only needs to maintain one configuration and interprets the first and second types of time-domain resources differently, yet it can still ensure that all random access channel transmission opportunities are valid, and that these opportunities occur at both ends of the uplink BWP or uplink subband, avoiding resource fragmentation.

[0226] In some embodiments, the random access channel transmission method shown in step 210 and the random access channel transmission method shown in step 220 can be implemented in combination. That is, some parameters in the relevant parameters can be configured by configuration method one, and other parameters can be configured by configuration method two; or, the first part of the relevant parameters can be configured by configuration method one, the second part of the parameters can be configured by configuration method two, and the third part of the parameters can be based on additional network device configuration or protocol agreement. For example, configuration method one can be used for power configuration, and configuration method two can be used for frequency domain configuration; or, for the frequency domain configuration of the random access channel, the first type of time domain resource corresponds to the first configuration, the second type of time domain resource corresponds to the second configuration, the first configuration and the second configuration include a first parameter, and the value of the first parameter corresponding to the first configuration is the same as or different from the value of the first parameter corresponding to the second configuration; the first type of time domain resource and the second type of time domain resource correspond to a third configuration, the third configuration includes a second parameter, and the third configuration has different interpretation methods for the first type of time domain resource and the second type of time domain resource. Specifically, the number of random access channel transmission opportunities corresponding to the first type of time-domain resources and the number of random access channel transmission opportunities corresponding to the second type of time-domain resources are determined according to the method shown in step 210. The positions of the random access channel transmission opportunities corresponding to the first type of time-domain resources and the second type of time-domain resources are determined according to the method shown in step 220. Steps 210 and 220 can be implemented as independent embodiments or as combined embodiments. When implemented as a combined embodiment, steps 210 and 220 can be executed in interchangeable order or simultaneously.

[0227] In some embodiments, a corresponding random access failure judgment method is designed for the case where the terminal device uses a random access preamble transmission counter for the first type of time domain resources and the second type of time domain resources respectively.

[0228] In some embodiments, random access problems are reported based on a first random access preamble transmission counter and a first threshold, or a second random access preamble transmission counter and a second threshold. The first threshold is related to a first maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to a first type of time-domain resource. The second threshold is related to a second maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to a second type of time-domain resource. Alternatively, random access problems are reported based on a first random access preamble transmission counter, a second random access preamble transmission counter, and a third threshold. The third threshold is related to the maximum number of transmissions of the random access preamble corresponding to the first type of time-domain resource and the second type of time-domain resource. The random access problem is used to indicate that there is an anomaly in the random access process of the terminal device.

[0229] Failure detection method 1: The first type of time domain resource and the second type of time domain resource each correspond to the maximum number of transmissions of a random access preamble.

[0230] If the value of the first random access preamble transmission counter is greater than or equal to the first threshold, a random access problem is reported; or, if the value of the second random access preamble transmission counter is greater than or equal to the second threshold, a random access problem is reported.

[0231] In some embodiments, the first threshold is a first maximum number of times, and the second threshold is a second maximum number of times; or, the first threshold is the sum of the first maximum number of times and the first initial value, and the second threshold is the sum of the second maximum number of times and the second initial value.

[0232] For example, the first type of time-domain resource is an SBFD symbol, and the second type of time-domain resource is a non-SBFD symbol; the first maximum number of attempts is denoted as preambleTransMax_SBFD, and the second maximum number of attempts is denoted as preambleTransMax_nonSBFD. The first type of time-domain resource corresponds to the first random access preamble transmission counter (PREAMBLE_TRANSMISSION_COUNTER_SBFD), and the second type of time-domain resource corresponds to the second random access preamble transmission counter (PREAMBLE_TRANSMISSION_COUNTER_nonSBFD); the first threshold is the sum of the first maximum number of attempts and the first initial value, and the second threshold is the sum of the second maximum number of attempts and the second initial value; the first initial value is the initial value of the first random access preamble transmission counter, which is 1; the second initial value is the initial value of the second random access preamble transmission counter, which is also 1. At this point, if PREAMBLE_TRANSMISSION_COUNTER_SBFD=preambleTransMax_SBFD+1, or PREAMBLE_TRANSMISSION_COUNTER_nonSBFD=preambleTransMax_nonSBFD+1, then a random access problem is reported.

[0233] In summary, the method provided in this application embodiment records the number of times the terminal device attempts a random access procedure by setting a preamble transmission counter, thereby enabling the terminal device to determine whether to continue the random access procedure when there are first-type and second-type time-domain resources.

[0234] Failure judgment method 2: The first type of time domain resources and the second type of time domain resources correspond to only one maximum number of transmissions of a random access preamble.

[0235] If the number of transmissions is greater than or equal to the third threshold, a random access problem is reported. The number of transmissions is the sum of the values ​​of the first random access preamble transmission counter and the second random access preamble transmission counter.

[0236] In some embodiments, the third threshold is the maximum number of transmissions of the random access preamble; or, the third threshold is the sum of the maximum number of transmissions of the random access preamble, the first initial value, and the second initial value.

[0237] For example, the first type of time-domain resource is an SBFD symbol, and the second type of time-domain resource is a non-SBFD symbol; the maximum number of transmissions of the random access preamble is denoted as preambleTransMax. The first type of time-domain resource corresponds to the first random access preamble transmission counter (PREAMBLE_TRANSMISSION_COUNTER_SBFD), and the second type of time-domain resource corresponds to the second random access preamble transmission counter (PREAMBLE_TRANSMISSION_COUNTER_nonSBFD); the third threshold is the sum of the maximum number of transmissions of the random access preamble, the first initial value, and the second initial value; the first initial value is the initial value of the first random access preamble transmission counter, which is 1; the second initial value is the initial value of the second random access preamble transmission counter, which is also 1. At this time, if PREAMBLE_TRANSMISSION_COUNTER_SBFD + PREAMBLE_TRANSMISSION_COUNTER_nonSBFD = preambleTransMax + 2, then a random access problem is reported.

[0238] In summary, the method provided in this application embodiment records the number of times the terminal device attempts a random access procedure by setting a preamble transmission counter, thereby enabling the terminal device to determine whether to continue the random access procedure when there are first-type and second-type time-domain resources.

[0239] Figure 17 A flowchart illustrating a transmission method for a random access channel provided in an exemplary embodiment of this application is shown. The method is performed by a network device and includes:

[0240] Step 330: Receive the random access channel. The random access channel is sent by the terminal device based on the relevant parameters of the random access channel when transmitted in the first type of time domain resources and / or the relevant parameters when transmitted in the second type of time domain resources.

[0241] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific type of time-domain resources is not limited in the embodiments of this application.

[0242] In some embodiments, the first type of time-domain resources and the second type of time-domain resources can be understood as two different duplex modes, time slots, or symbols, etc. The number, location, size, and frequency bandwidth of available uplink resources in the first type of time-domain resources and the second type of time-domain resources are different; or, in other words, the number, location, size, and frequency bandwidth of random access channels in the first type of time-domain resources and the second type of time-domain resources are different. For example, the first type of time-domain resources may be SBFD symbols, and the second type of time-domain resources may be non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0243] In some embodiments, the relevant parameters include at least one of the following: transmit power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; power ramp step size of random access channel; first parameter, which indicates the number of frequency division multiplexing random access channel transmission opportunities in one time unit, such as one time unit being a time instance; second parameter, which indicates the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, the reference point being PRB0 of the uplink BWP. Specifically, the transmit power indicates how much energy the terminal device will use to transmit the random access channel; the target power level indicates the target power of the random access channel desired by the network device's receiver; the power ramp counter indicates the number of power ramps, and generally, the power ramp counter increments by 1 after each random access failure; the random access preamble transmission counter indicates the number of preamble transmissions during the random access process, i.e., the number of times the random access channel is transmitted; the maximum number of random access preamble transmissions indicates the maximum number of preamble transmissions during the entire random access process, i.e., the maximum number of times the random access channel is transmitted; and the power ramp step size of the random access channel indicates the amount of power increase during each power ramp.

[0244] For example, such as Figure 6 As shown, the slashed square 10 represents a random access channel transmission opportunity, with the first parameter being 2, indicating that the number of frequency division multiplexing random access channel transmission opportunities in one time unit is 2; if the reference point is the PRB0 of the active UL BWP (active uplink BWP), that is, the starting PRB of the active UL BWP, then Figure 6 The offset between the lowest random access channel transmission opportunity in the frequency domain and PRB0 is the second parameter.

[0245] In some embodiments, the relevant parameters of the random access channel during transmission include power-related parameters and / or frequency-related parameters.

[0246] In some embodiments, power-related parameters include transmit power and power ramp-up counter.

[0247] The specific calculation process for transmission power is the same as the calculation process for transmission power of the terminal device, which will not be elaborated here.

[0248] In some embodiments, the target power level includes a first target power level and a second target power level, a first type of time-domain resource corresponds to the first target power level, and a second type of time-domain resource corresponds to the second target power level; a random access channel is received, the random access channel transmission opportunity corresponds to the first type of time-domain resource, and the first transmit power of the random access channel is determined by the terminal device based on the first target power level; and / or, a random access channel is received, the random access channel transmission opportunity corresponds to the second type of time-domain resource, and the second transmit power of the random access channel is determined by the terminal device based on the second target power level.

[0249] In some embodiments, the first transmit power is determined by the terminal device based on at least one of a first target power level, a power ramp step size, a power ramp counter, and a preamble increment; the second transmit power is determined by the terminal device based on at least one of a second target power level, a power ramp step size, a power ramp counter, and a preamble increment; wherein the preamble increment is determined based on at least one of a random access preamble format and a subcarrier spacing.

[0250] In some embodiments, the first type of time-domain resource corresponds to at least one of a first power ramp-up counter, a first random access preamble transmission counter, and a first power ramp-up step size; the second type of time-domain resource corresponds to at least one of a second power ramp-up counter, a second random access preamble transmission counter, and a second power ramp-up step size.

[0251] In some embodiments, a random access channel is received, the transmission opportunity of the random access channel corresponding to a first type of time-domain resource, and the first transmit power of the random access channel is determined by the terminal device based on at least one of a first target power level and a value of a first power ramp counter; and / or, a random access channel is received, the transmission opportunity of the random access channel corresponding to a second type of time-domain resource, and the second transmit power of the random access channel is determined by the terminal device based on at least one of a second target power level and a value of a second power ramp counter. For example, the first type of time-domain resource corresponds to a first power ramp counter, and the second type of time-domain resource corresponds to a second power ramp counter, but the first type of time-domain resource and the second type of time-domain resource share the same target power level; or, the first type of time-domain resource corresponds to a first target power level, and the second type of time-domain resource corresponds to a second target power level, but the first type of time-domain resource and the second type of time-domain resource share the same power ramp counter; or, the first type of time-domain resource corresponds to a first target power level and a first power ramp counter, and the second type of time-domain resource corresponds to a second target power level and a second power ramp counter.

[0252] In some embodiments, the first transmit power is determined by the terminal device based on at least one of a first target power level, a first power ramp step size, a first power ramp counter, and a preamble increment; the second transmit power is determined by the terminal device based on at least one of a second target power level, a second power ramp step size, a second power ramp counter, and a preamble increment; wherein the preamble increment is determined based on at least one of a random access preamble format and a subcarrier spacing.

[0253] The following section illustrates different ramp-up modes of the power ramp-up counter in the terminal device.

[0254] In some embodiments, for random access channel transmission, if the corresponding time-domain resource type changes compared to the previous transmission, the terminal device keeps the power ramp-up counter unchanged.

[0255] In some embodiments, for random access channel transmission, if the corresponding time-domain resource type changes compared to the previous transmission, the terminal device resets or initializes the power ramp-up counter.

[0256] In some embodiments, when the random access procedure is initiated, the terminal device initializes at least one of a first power ramp-up counter, a first random access preamble transmission counter, a second power ramp-up counter, and a second random access preamble transmission counter; if the random access channel transmission fails and the random access channel corresponds to a first type of time-domain resource, the first random access preamble transmission counter in the terminal device is incremented by 1; if the random access channel transmission fails and the random access channel corresponds to a second type of time-domain resource, the second random access preamble transmission counter in the terminal device is incremented by 1; if the random access channel corresponds to a first type of time-domain resource and the value of the first random access preamble transmission counter is greater than a first initial value, the first power ramp-up counter in the terminal device is incremented by 1; if the random access channel corresponds to a second type of time-domain resource and the value of the second random access preamble transmission counter is greater than a second initial value, the second power ramp-up counter in the terminal device is incremented by 1. The failure of random access channel transmission is indicated by the following: if the RAR window times out but no random access response containing the first random access preamble identifier is received, or if contention resolution fails, the random access channel transmission is considered to have failed. The first random access preamble identifier matches the random access channel preamble index sent by the terminal.

[0257] In some embodiments, the initial transmission and retransmission of the random access channel correspond to the same time-domain resource type; or, the terminal device does not expect the retransmission of the random access channel to change the corresponding time-domain resource type relative to the initial transmission or the previous transmission; or, the terminal device does not expect the time-domain resource type corresponding to the retransmission of the random access channel to be different from the time-domain resource type corresponding to the initial transmission of the random access channel or the previous transmission of the random access channel.

[0258] In some embodiments, the terminal device receives a random access problem reported by the terminal device. The random access problem is reported based on a first random access preamble transmission counter and a first threshold, or a second random access preamble transmission counter and a second threshold. The first threshold is related to a first maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to a first type of time-domain resource. The second threshold is related to a second maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to a second type of time-domain resource. Alternatively, the terminal device receives a random access problem reported by the terminal device. The random access problem is reported based on a first random access preamble transmission counter, a second random access preamble transmission counter, and a third threshold. The third threshold is related to the maximum number of transmissions of the random access preamble corresponding to the first type of time-domain resource and the second time-domain resource class. The random access problem is used to indicate that there is an anomaly in the random access process of the terminal device.

[0259] In some embodiments, a random access channel (RID) transmission opportunity is valid if: the RID transmission opportunity is within an uplink symbol; or, the RID transmission opportunity is within a first type of time-domain resource and located within a first frequency-domain bandwidth, for example, the RID transmission opportunity is within a first type of time-domain resource and located at the intersection of the uplink subband and the uplink BWP. Here, the first type of time-domain resource is an SBFD symbol; a RID transmission opportunity being within an uplink symbol means that the symbols containing the RID transmission opportunity are all uplink symbols; a RID transmission opportunity being within a first type of time-domain resource means that the symbols containing the RID transmission opportunity are all SBFD symbols; that is, if a RID transmission opportunity is located in symbols that include both uplink symbols and SBFD symbols, then this RID transmission opportunity is invalid.

[0260] In some embodiments, the first frequency domain bandwidth is a subset of the available uplink bandwidth configured by the network device for the terminal device; the first frequency domain bandwidth is the actual available uplink bandwidth determined in the uplink BWP of the terminal device based on the first duplex mode or the first type of time domain resource. The first duplex mode or the first type of time domain resource may be SBFD.

[0261] In some embodiments, the uplink BWP is an uplink BWP activated for uplink transmission of the terminal device. The first frequency domain bandwidth is the total bandwidth or a portion of the bandwidth of the uplink BWP. Due to the different available uplink subbands in different duplex modes or different time domain resource types, the first frequency domain bandwidth may be dynamically changing even for the same terminal device.

[0262] In some embodiments, the first frequency domain bandwidth can be understood as the available subband, available uplink subband, actual available subband, or actual available uplink subband in the uplink BWP.

[0263] In summary, the method provided in this application embodiment involves a network device receiving a random access channel. This random access channel is sent by the terminal device based on the relevant parameters of the random access channel when transmitted in the first type of time domain resource and / or when transmitted in the second type of time domain resource. In other words, the random access channel received by the network device is determined by the terminal device based on different relevant parameters corresponding to different time domain resource types.

[0264] In an optional embodiment, the first frequency domain bandwidth is a portion of the available subband within the uplink BWP. The first frequency domain bandwidth is the actual available uplink bandwidth of the terminal device. For a detailed description of the first frequency domain bandwidth, please refer to "1. First Frequency Domain Bandwidth" above, and it will not be repeated here.

[0265] In some embodiments, the network device provides differentiated configurations for terminal devices for a first type of time-domain resources and / or a second type of time-domain resources. There are two configuration methods, which will be described separately below.

[0266] 4.1 Configuration Method 1.

[0267] Based on Figure 17 In an optional embodiment, the method further includes:

[0268] Step 310: Send the first configuration and the second configuration. The first configuration and the second configuration are used to configure the relevant parameters when transmitting through the random access channel. The first configuration corresponds to the first type of time domain resource, and the second configuration corresponds to the second type of time domain resource.

[0269] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific types of time-domain resources are not limited in the embodiments of this application; typically, a first configuration corresponds to a first type of symbol, and a second configuration corresponds to a second type of symbol for illustrative purposes. For example, the first configuration corresponds to SBFD symbols, and the second configuration corresponds to non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0270] In some embodiments, the configuration of the random access channel includes at least one of a power configuration and a frequency domain configuration. The power configuration is used to configure power-related parameters during random access channel transmission, and the frequency domain configuration is used to configure frequency-related parameters during random access channel transmission. A first configuration includes at least one of a first power configuration and a first frequency domain configuration; a second configuration includes at least one of a second power configuration and a second frequency domain configuration. The configuration items included in the first configuration and the second configuration are the same; that is, if the first configuration includes the first power configuration, the second configuration should also include the second power configuration; if the first configuration includes the first frequency domain configuration, the second configuration should also include the second frequency domain configuration; if the first configuration includes both the first power configuration and the first frequency domain configuration, the second configuration should also include both the second power configuration and the second frequency domain configuration.

[0271] In some embodiments, the power configuration includes at least one of the following related parameters: target power level; maximum number of transmissions of the random access preamble; power ramp-up step size of the random access channel; that is, either the first configuration or the second configuration includes at least one of the following related parameters: target power level; maximum number of transmissions of the random access preamble; power ramp-up step size of the random access channel.

[0272] In some embodiments, the power-related parameters include at least one of the following parameters: transmit power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; and power ramp step size of random access channel.

[0273] In some embodiments, the first configuration and the second configuration include only parameters with different values. Parameters with the same values ​​in the first and second configurations can be additionally configured by the network device or agreed upon by the communication protocol. For example, the first configuration includes a first target power level, the second configuration includes a second target power level, the maximum number of transmissions of the random access preamble and the power ramp-up step size of the random access channel are additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level and a first power ramp-up step size, the second configuration includes a second target power level and a second power ramp-up step size, the maximum number of transmissions of the random access preamble is additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level and a first maximum number of transmissions, the second configuration includes a second target power level and a second maximum number of transmissions, the power ramp-up step size of the random access channel is additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level, a first maximum number of transmissions and a first power ramp-up step size, the second configuration includes a second target power level, a second maximum number of transmissions and a second power ramp-up step size.

[0274] In some embodiments, the first configuration and the second configuration include all parameters. That is, the first configuration includes a first target power level, a first maximum number of attempts, and a first power ramp-up step size, and the second configuration includes a second target power level, a second maximum number of attempts, and a second power ramp-up step size. The first maximum number of attempts may be the same as or different from the second maximum number of attempts, and the first power ramp-up step size may be the same as or different from the second power ramp-up step size.

[0275] In some embodiments, the frequency domain configuration includes at least one of the following related parameters: a first parameter indicating the number of frequency-division multiplexed random access channel transmission opportunities in a time unit; and a second parameter indicating the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, where the reference point is the PRB0 of the uplink BWP. That is, either the first configuration or the second configuration includes at least one of the following related parameters: a first parameter indicating the number of frequency-division multiplexed random access channel transmission opportunities in a time unit; and a second parameter indicating the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, where the reference point is the PRB0 of the uplink BWP.

[0276] In some embodiments, the first configuration and the second configuration share some related parameters. For example, such as... Figure 14 As shown, the terminal device uses a set of power ramp-up counters and preamble transmission counters for both the first and second configurations. The shared parameters for both configurations are the power ramp-up counter and the preamble transmission counter. The first configuration includes at least one of the following: a first target power level, a first maximum number of ramps, a first power ramp-up step size, a first parameter 1, and a second parameter 1. The second configuration includes at least one of the following: a second target power level, a second maximum number of ramps, a second power ramp-up step size, a first parameter 2, and a second parameter 2. The first target power level and the second target power level are typically different. The first maximum number of ramps and the second maximum number of ramps can be the same or different; the first power ramp-up step size and the second power ramp-up step size can be the same or different; the first parameter 1 and the first parameter 2 can be the same or different; and the second parameter 1 and the second parameter 2 can be the same or different.

[0277] In some embodiments, the first configuration and the second configuration do not share related parameters. For example, such as... Figure 15 As shown. The terminal device uses a power ramp-up counter and a preamble transmission counter for the first configuration and the second configuration, respectively. The first configuration includes at least one of the following: a first target power level, a first maximum number of times, a first power ramp-up step size, a first power ramp-up counter, a first preamble transmission counter, a first parameter 1, and a second parameter 1. The second configuration includes at least one of the following: a second target power level, a second maximum number of times, a second power ramp-up step size, a second power ramp-up counter, a second preamble transmission counter, a first parameter 2, and a second parameter 2. Wherein, the first target power level and the second target power level are usually different. The first maximum number of times and the second maximum number of times can be the same or different; the first power ramp-up step size and the second power ramp-up step size can be the same or different; the first power ramp-up counter and the second power ramp-up counter are usually different; the first preamble transmission counter and the second preamble transmission counter are usually different; the first parameter 1 and the first parameter 2 can be the same or different; and the second parameter 1 and the second parameter 2 can be the same or different.

[0278] In some embodiments, a first configuration parameter and a second configuration parameter are sent, the first configuration parameter corresponding to a first configuration and the second configuration parameter corresponding to a second configuration; or, a first configuration parameter and an offset value are sent, the first configuration parameter corresponding to the first configuration and the configuration parameter after offset based on the offset value corresponding to the second configuration; or, a second configuration parameter and an offset value are sent, the second configuration parameter corresponding to the second configuration and the configuration parameter after offset based on the offset value corresponding to the first configuration; or, a first configuration parameter is sent, the first configuration parameter corresponding to the first configuration; or, a second configuration parameter is sent, the second configuration parameter corresponding to the second configuration. For example, the first configuration parameter includes a first target power level, and the second configuration parameter includes a second target power level; or, the first configuration includes a first target power level and the offset value includes a target power level offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset; or, the first configuration includes a first target power level and a first power ramp step size, and the offset value includes a target power level offset and a power ramp step size offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset, and the second power ramp step size corresponding to the second configuration is the sum of the first target power ramp step size and the power ramp step size offset.

[0279] In some embodiments, a portion of the relevant parameters are configured by a first configuration parameter and a second configuration parameter; another portion of the relevant parameters are configured by a first configuration parameter and an offset value; or, a first portion of the relevant parameters are configured by a first configuration parameter and a second configuration parameter, a second portion of the relevant parameters are configured by a first configuration parameter and an offset value, and a third portion of the relevant parameters are based on additional network device configuration or protocol agreement. For example, the relevant parameters include a target power level, a maximum number of transmissions of the random access preamble, and a power ramp-up step size of the random access channel; for the target power level, the first configuration parameter (i.e., the first target power level) and a second configuration parameter (i.e., the second target power level) are used for configuration; or, based on additional network device configuration or protocol agreement; or, configured by a first configuration parameter (i.e., the first target power level) and an offset value (i.e., the target power level offset); for the maximum number of transmissions of the random access preamble, the first configuration parameter (i.e., the first maximum number) and a second... The configuration parameters (i.e., the second maximum number of times) are configured; or, based on additional network device configuration or protocol agreement; or, the first configuration parameter (i.e., the first maximum number of times) and the offset value (i.e., the maximum number of times offset) are used for configuration; for the power ramp-up step size of the random access channel, the first configuration parameter (i.e., the first power ramp-up step size) and the second configuration parameter (i.e., the second power ramp-up step size) are used for configuration; or, based on additional network device configuration or protocol agreement; or, the first configuration parameter (i.e., the first power ramp-up step size) and the offset value (i.e., the power ramp-up step size offset) are used for configuration.

[0280] For example, the first configuration parameter includes a first target power level, and the second configuration parameter includes a second target power level; or, the first configuration includes a first target power level and the offset value includes a target power level offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset; or, the first configuration includes a first target power level and a first power ramp step size, and the offset value includes a target power level offset and a power ramp step size offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset, and the second power ramp step size corresponding to the second configuration is the sum of the first target power ramp step size and the power ramp step size offset.

[0281] For example, if the second configuration parameter is the second target power level, denoted as `preambleReceivedTargetPower`, and the offset value is the target power level offset, denoted as `delta_SBFD`, then the first target power level corresponding to the first configuration is `preambleReceivedTargetPower + delta_SBFD`. In this case, the calculation formulas for the first and second transmit power are as follows.

[0282] First transmit power = preambleReceivedTargetPower + delta_SBFD + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0283] Second transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0284] In an optional embodiment, the power configuration of the random access channel can also be implemented as follows: when the time-domain resource type used in the current transmission is different from the time-domain resource type used in the previous transmission, the power ramp-up counter is incremented by 1; an offset count is set and denoted as counter_SBFD. When the time-domain resource type used in the initial transmission is the first type of time-domain resource, the offset count is initialized to 1; when the time-domain resource type used in the initial transmission is the second type of time-domain resource, the offset count is initialized to 0; when the time-domain resource type used in the retransmission is the first type of time-domain resource, the offset count is incremented by 1, i.e., counter_SBFD+1. In this case, the calculation formulas for the first transmission power and the second transmission power are as follows.

[0285] First transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP + counter_SBFD × delta_SBFD.

[0286] Second transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0287] In summary, the method provided in this application embodiment allows the network device to perform random access by sending a first configuration and a second configuration of the random access channel to the terminal device. Since the first configuration corresponds to a first type of time domain resource and the second configuration corresponds to a second type of time domain resource, the terminal device can select different configurations for different time domain resource types during the random access process.

[0288] 4.2 Configuration Method Two.

[0289] Based on Figure 17 In an optional embodiment, the method further includes:

[0290] Step 320: Send the third configuration, which is used to configure the relevant parameters when transmitting through the random access channel. The third configuration corresponds to the first type of time domain resources and the second type of time domain resources.

[0291] In some embodiments, when configuring the frequency domain related parameters of the random access channel, a single configuration, namely the third configuration, can be used for both the first type of time domain resources and the second type of time domain resources.

[0292] In some embodiments, the third configuration includes a second parameter; the second parameter indicates the offset between the lowest random access channel transmission opportunity and the reference point in the frequency domain dimension. Specifically, for the first type of time-domain resource, the reference point is the lowest PRB of the first frequency domain bandwidth in the frequency domain; for the second type of time-domain resource, the reference point is the PRB0 of the uplink BWP.

[0293] In some embodiments, the third configuration further includes a first parameter, which indicates the number of frequency division multiplexing random access channel transmission opportunities in a time unit, such as a time unit being a time instance.

[0294] For example, such as Figure 16 As shown, the third configuration includes a first parameter and a second parameter. The first parameter can be denoted as msg1-FDM, and the second parameter can be denoted as msg1-FrequencyStart. Figure 16Based on the parameters msg1-FDM=2 and msg1-FrequencyStart=0 configured in the third configuration, a set of random access channel transmission opportunities 28 for the first type of time-domain resources and a set of random access channel transmission opportunities 29 for the second type of time-domain resources are selected. The set of random access channel transmission opportunities 28 includes 4 random access channel transmission opportunities, and the set of random access channel transmission opportunities 29 also includes 4 random access channel transmission opportunities. The reference point for the first type of time-domain resources is designated as reference point 30, and the reference point for the second type of time-domain resources is designated as reference point 31. Reference point 30 is the lowest PRB in the frequency domain dimension of the intersection of the uplink subband and the uplink BWP, and reference point 31 is the PRB0 of the uplink BWP.

[0295] In summary, the method provided in this application allows the network device to set only one configuration for the first type of time domain resources and the second type of time domain resources, thus saving signaling overhead. The terminal device only needs to maintain one configuration and interprets the first type of time domain resources and the second type of time domain resources differently, still ensuring that all random access channel transmission opportunities are valid, and also ensuring that random access channel transmission opportunities occur at both ends of the uplink BWP or uplink subband, avoiding resource fragmentation.

[0296] In some embodiments, the random access channel transmission method shown in step 310 and the random access channel transmission method shown in step 320 can be implemented in combination. That is, some parameters in the relevant parameters can be configured by configuration method one, and other parameters can be configured by configuration method two; or, the first part of the relevant parameters can be configured by configuration method one, the second part of the parameters can be configured by configuration method two, and the third part of the parameters can be based on additional network device configuration or protocol agreement. For example, for the frequency domain configuration of the random access channel, the first type of time domain resource corresponds to the first configuration, the second type of time domain resource corresponds to the second configuration, the first configuration and the second configuration include a first parameter, and the value of the first parameter corresponding to the first configuration is the same as or different from the value of the first parameter corresponding to the second configuration; the first type of time domain resource and the second type of time domain resource correspond to a third configuration, the third configuration includes a second parameter, and the third configuration has different interpretation methods for the first type of time domain resource and the second type of time domain resource. The terminal device configures the number of random access channel transmission opportunities corresponding to the first type of time-domain resources and the number of random access channel transmission opportunities corresponding to the second type of time-domain resources according to the method shown in step 310, and configures the positions of the random access channel transmission opportunities corresponding to the first type of time-domain resources and the second type of time-domain resources according to the method shown in step 320. Steps 310 and 320 can be implemented as independent embodiments or as combined embodiments. When implemented as a combined embodiment, steps 310 and 320 can be executed in interchangeable order or simultaneously.

[0297] Figure 18 A flowchart illustrating a random access channel transmission method provided in an exemplary embodiment of this application is shown. The method is performed by the aforementioned terminal device and includes:

[0298] Step 410: Receive at least one of the first configuration, the second configuration, and the third configuration. The first configuration, the second configuration, and the third configuration are used to configure relevant parameters for random access channel transmission. The first configuration corresponds to the first type of time domain resource, the second configuration corresponds to the second type of time domain resource, and the third configuration corresponds to both the first type of time domain resource and the second type of time domain resource.

[0299] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific type of time-domain resources is not limited in the embodiments of this application.

[0300] In some embodiments, the first type of time-domain resources and the second type of time-domain resources can be understood as two different duplex modes, time slots, or symbols, etc. The number, location, size, and frequency bandwidth of available uplink resources in the first type of time-domain resources and the second type of time-domain resources are different; or, in other words, the number, location, size, and frequency bandwidth of random access channels in the first type of time-domain resources and the second type of time-domain resources are different. For example, the first type of time-domain resources may be SBFD symbols, and the second type of time-domain resources may be non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0301] In some embodiments, the terminal device receives a first configuration and a second configuration; or, the terminal device receives a third configuration; or, the terminal device receives a first configuration, a second configuration, and a third configuration.

[0302] The first, second, and third configurations received by the terminal device are described in "3.1 Configuration Method 1" and "3.2 Configuration Method 2" above, and will not be repeated here.

[0303] In summary, the method provided in this application embodiment allows the terminal device to receive at least one of a first configuration, a second configuration, and a third configuration before transmitting through a random access channel. The first, second, and third configurations are used to configure relevant parameters for random access channel transmission. The first configuration corresponds to a first type of time-domain resource, the second configuration corresponds to a second type of time-domain resource, and the third configuration corresponds to both the first and second types of time-domain resources. The first and second configurations correspond to separate configurations, while the third configuration corresponds to a combined configuration. Whether configured separately or jointly, the terminal device can select different configurations for different time-domain resource types during random access.

[0304] Figure 19 A flowchart illustrating a transmission method for a random access channel provided in an exemplary embodiment of this application is shown. The method is executed by the aforementioned terminal device and includes:

[0305] Step 510: Transmit the random access channel on a valid random access channel transmission opportunity;

[0306] A random access channel transmission opportunity is valid if: the random access channel transmission opportunity is within an uplink symbol; or, the random access channel transmission opportunity is within a first type of time domain resource and the random access channel transmission opportunity is within a first frequency domain bandwidth.

[0307] For example, a random access channel (RAVC) transmission opportunity may occur within the first type of time domain resources, and the RAVC transmission opportunity may be located within the intersection of the uplink subband and the uplink BWP. Here, the first type of time domain resources are SBFD symbols; "the RAVC transmission opportunity is within the uplink symbols" means that the symbols containing the RAVC transmission opportunity are all uplink symbols; "the RAVC transmission opportunity is within the first type of time domain resources" means that the symbols containing the RAVC transmission opportunity are all SBFD symbols; that is, if a RAVC transmission opportunity is located in symbols that include both uplink symbols and SBFD symbols, then this RAVC transmission opportunity is invalid.

[0308] In some embodiments, the first frequency domain bandwidth is a subset of the available uplink bandwidth configured by the network device for the terminal device; the first frequency domain bandwidth is the actual available uplink bandwidth determined in the uplink BWP of the terminal device based on the first duplex mode or the first type of time domain resource. The first duplex mode or the first type of time domain resource may be SBFD.

[0309] In some embodiments, the uplink BWP is an uplink BWP activated for uplink transmission of the terminal device. The first frequency domain bandwidth is the total bandwidth or a portion of the bandwidth of the uplink BWP. Due to the different available uplink subbands in different duplex modes or different time domain resource types, the first frequency domain bandwidth may be dynamically changing even for the same terminal device.

[0310] In some embodiments, the first frequency domain bandwidth can be understood as the available subband, available uplink subband, actual available subband, or actual available uplink subband in the uplink BWP.

[0311] In some embodiments, the first frequency domain bandwidth is a portion of the available subband within the uplink BWP. The first frequency domain bandwidth is the actual available uplink bandwidth of the terminal device. For a detailed description of the first frequency domain bandwidth, please refer to "1. First Frequency Domain Bandwidth" above, and it will not be repeated here.

[0312] In summary, the method provided in this application illustrates that the transmission condition of the random access channel is transmission on a valid random access channel transmission opportunity, and gives the transmission conditions for a valid random access channel transmission opportunity, enabling the terminal device to successfully transmit during random access channel transmission.

[0313] Figure 20 This illustration shows a structural block diagram of a transmission apparatus for a random access channel provided in an exemplary embodiment of this application. The apparatus can be implemented as a terminal device, or as part of a terminal device, through software, hardware, or a combination of both. The apparatus includes:

[0314] The first transmitting module 610 is used to transmit the random access channel according to the relevant parameters of the random access channel when it is transmitted in the first type of time domain resources and / or the relevant parameters when it is transmitted in the second type of time domain resources.

[0315] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific type of time-domain resources is not limited in the embodiments of this application.

[0316] In some embodiments, the first type of time-domain resources and the second type of time-domain resources can be understood as two different duplex modes, time slots, or symbols, etc. The number, location, size, and frequency bandwidth of available uplink resources in the first type of time-domain resources and the second type of time-domain resources are different; or, in other words, the number, location, size, and frequency bandwidth of random access channels in the first type of time-domain resources and the second type of time-domain resources are different. For example, the first type of time-domain resources may be SBFD symbols, and the second type of time-domain resources may be non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0317] In some embodiments, the relevant parameters include at least one of the following: transmit power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; power ramp step size of random access channel; first parameter, which indicates the number of random access channel transmission opportunities in frequency division multiplexing within one time unit; second parameter, which indicates the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, the reference point being the PRB0 of the uplink BWP, i.e., the starting PRB of the uplink BWP. Specifically, the transmit power indicates how much energy the terminal device will use to transmit the random access channel; the target power level indicates the target power of the random access channel desired by the network device's receiver; the power ramp counter indicates the number of power ramps, and generally, the power ramp counter increments by 1 after each random access failure; the random access preamble transmission counter indicates the number of preamble transmissions during the random access process, i.e., the number of times the random access channel is transmitted; the maximum number of random access preamble transmissions indicates the maximum number of preamble transmissions during the entire random access process, i.e., the maximum number of times the random access channel is transmitted; and the power ramp step size of the random access channel indicates the amount of power increase during each power ramp.

[0318] For example, such as Figure 6As shown, the slashed square 10 represents a random access channel transmission opportunity. The first parameter is 2, indicating that the number of frequency division multiplexing random access channel transmission opportunities in a time instance is 2. If the reference point is the PRB0 of the active UL BWP (active uplink BWP), that is, the starting PRB of the active UL BWP, then... Figure 6 The offset between the lowest random access channel transmission opportunity in the frequency domain and PRB0 is the second parameter.

[0319] In some embodiments, the relevant parameters of the random access channel during transmission include power-related parameters and / or frequency-related parameters.

[0320] In some embodiments, a random access channel (RID) transmission opportunity is valid if: the RID transmission opportunity is within an uplink symbol; or, the RID transmission opportunity is within a first type of time-domain resource and located within a first frequency-domain bandwidth, for example, the RID transmission opportunity is within an SBFD symbol and located at the intersection of an uplink subband and an uplink BWP. Here, the first type of time-domain resource is an SBFD symbol; "the RID transmission opportunity is within an uplink symbol" means that the symbols containing the RID transmission opportunity are all uplink symbols; "the RID transmission opportunity is within a first type of time-domain resource" means that the symbols containing the RID transmission opportunity are all SBFD symbols; that is, if a RID transmission opportunity is located in symbols that include both uplink symbols and SBFD symbols, then this RID transmission opportunity is invalid.

[0321] In some embodiments, the first frequency domain bandwidth is a subset of the available uplink bandwidth configured by the network device for the terminal device; the first frequency domain bandwidth is the actual available uplink bandwidth determined in the uplink BWP of the terminal device based on the first duplex mode or the first type of time domain resource. The first duplex mode or the first type of time domain resource may be SBFD.

[0322] In some embodiments, the uplink BWP is an uplink BWP activated for uplink transmission of the terminal device. The first frequency domain bandwidth is the total bandwidth or a portion of the bandwidth of the uplink BWP. Due to the different available uplink subbands in different duplex modes or different time domain resource types, the first frequency domain bandwidth may be dynamically changing even for the same terminal device.

[0323] In some embodiments, the first frequency domain bandwidth can be understood as the available subband, available uplink subband, actual available subband, or actual available uplink subband in the uplink BWP.

[0324] In summary, the apparatus provided in this application allows the terminal device to send a random access channel based on the relevant parameters when transmitting in the first type of time domain resource and / or the relevant parameters when transmitting in the second type of time domain resource. That is, the terminal device can determine the relevant parameters for transmission under each type of time domain resource for different time domain resource types and send the random access channel based on the relevant parameters.

[0325] In an optional embodiment, the first frequency domain bandwidth is a portion of the available subband within the uplink BWP. The first frequency domain bandwidth is the actual available uplink bandwidth of the terminal device. For a detailed description of the first frequency domain bandwidth, please refer to "1. First Frequency Domain Bandwidth" above, and it will not be repeated here.

[0326] In some embodiments, the relevant parameters of the random access channel during transmission include power-related parameters and / or frequency-domain related parameters. For a detailed description of power-related parameters and frequency-domain related parameters, please refer to "2.1 Power-related parameters" and "2.2 Frequency-domain related parameters" in the method section above; they will not be repeated here.

[0327] In some embodiments, the network device provides differentiated configurations for terminal devices for a first type of time-domain resources and / or a second type of time-domain resources. There are two configuration methods, which will be described separately below.

[0328] 3.1 Configuration Method 1.

[0329] Based on Figure 20 In an optional embodiment, the device further includes:

[0330] The first receiving module is used to receive a first configuration and a second configuration. The first configuration and the second configuration are used to configure relevant parameters for random access channel transmission. The first configuration corresponds to a first type of time domain resource, and the second configuration corresponds to a second type of time domain resource.

[0331] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific types of time-domain resources are not limited in the embodiments of this application; typically, a first configuration corresponds to a first type of symbol, and a second configuration corresponds to a second type of symbol for illustrative purposes. For example, the first configuration corresponds to SBFD symbols, and the second configuration corresponds to non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0332] In some embodiments, the configuration of the random access channel includes at least one of a power configuration and a frequency domain configuration. The power configuration is used to configure power-related parameters during random access channel transmission, and the frequency domain configuration is used to configure frequency-related parameters during random access channel transmission. A first configuration includes at least one of a first power configuration and a first frequency domain configuration; a second configuration includes at least one of a second power configuration and a second frequency domain configuration. The configuration items included in the first configuration and the second configuration are the same; that is, if the first configuration includes the first power configuration, the second configuration should also include the second power configuration; if the first configuration includes the first frequency domain configuration, the second configuration should also include the second frequency domain configuration; if the first configuration includes both the first power configuration and the first frequency domain configuration, the second configuration should also include both the second power configuration and the second frequency domain configuration.

[0333] In some embodiments, the power configuration includes at least one of the following related parameters: target power level; maximum number of transmissions of the random access preamble; power ramp-up step size of the random access channel; that is, either the first configuration or the second configuration includes at least one of the following related parameters: target power level; maximum number of transmissions of the random access preamble; power ramp-up step size of the random access channel.

[0334] In some embodiments, power-related parameters include at least one of the following parameters: transmit power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; and power ramp step size of random access channel. The first part of the related parameters is based on additional network device configuration or protocol agreement, and the second part of the parameters is selected, calculated, or determined by the terminal device based on the first part of the parameters. For example, power-related parameters are configured using configuration method one, and either the first configuration or the second configuration includes at least one of the following parameters: target power level, maximum number of transmissions of random access preamble, and power ramp step size of random access channel.

[0335] In some embodiments, the first configuration includes a first target power level, and the second configuration includes a second target power level.

[0336] In some embodiments, the first configuration further includes a first power ramp-up step size, and the second configuration further includes a second power ramp-up step size. The first power ramp-up step size and the second power ramp-up step size may be the same as or different from each other.

[0337] In some embodiments, the first configuration further includes a first maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to the first type of time-domain resource; the second configuration further includes a second maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to the second type of time-domain resource. The first maximum number of transmissions and the second maximum number of transmissions may be the same or different.

[0338] In some embodiments, the first configuration and the second configuration include only parameters with different values. Parameters with the same values ​​in the first and second configurations can be additionally configured by the network device or agreed upon by the communication protocol. For example, the first configuration includes a first target power level, the second configuration includes a second target power level, the maximum number of transmissions of the random access preamble and the power ramp-up step size of the random access channel are additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level and a first power ramp-up step size, the second configuration includes a second target power level and a second power ramp-up step size, the maximum number of transmissions of the random access preamble is additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level and a first maximum number of transmissions, the second configuration includes a second target power level and a second maximum number of transmissions, the power ramp-up step size of the random access channel is additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level, a first maximum number of transmissions and a first power ramp-up step size, the second configuration includes a second target power level, a second maximum number of transmissions and a second power ramp-up step size.

[0339] In some embodiments, the first configuration and the second configuration include all parameters. That is, the first configuration includes a first target power level, a first maximum number of attempts, and a first power ramp-up step size, and the second configuration includes a second target power level, a second maximum number of attempts, and a second power ramp-up step size. The first maximum number of attempts may be the same as or different from the second maximum number of attempts, and the first power ramp-up step size may be the same as or different from the second power ramp-up step size.

[0340] In some embodiments, the frequency domain configuration includes at least one of the following related parameters: a first parameter indicating the number of frequency-division multiplexed random access channel transmission opportunities in one time unit; and a second parameter indicating the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, where the reference point is the PRB0 of the uplink BWP, i.e., the starting PRB of the uplink BWP. That is, either the first configuration or the second configuration includes at least one of the following related parameters: a first parameter indicating the number of frequency-division multiplexed random access channel transmission opportunities in one time unit; and a second parameter indicating the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, where the reference point is the PRB0 of the uplink BWP.

[0341] In some embodiments, the first configuration and the second configuration share some related parameters. For example, such as... Figure 14As shown, the terminal device uses a set of power ramp-up counters and preamble transmission counters for both the first and second configurations. The shared parameters for both configurations are the power ramp-up counter and the preamble transmission counter. The first configuration includes at least one of the following: a first target power level, a first maximum number of ramps, a first power ramp-up step size, a first parameter 1, and a second parameter 1. The second configuration includes at least one of the following: a second target power level, a second maximum number of ramps, a second power ramp-up step size, a first parameter 2, and a second parameter 2. The first target power level and the second target power level are typically different. The first maximum number of ramps and the second maximum number of ramps can be the same or different; the first power ramp-up step size and the second power ramp-up step size can be the same or different; the first parameter 1 and the first parameter 2 can be the same or different; and the second parameter 1 and the second parameter 2 can be the same or different.

[0342] In some embodiments, the first configuration and the second configuration do not share related parameters. For example, such as... Figure 15 As shown. The terminal device uses a power ramp-up counter and a preamble transmission counter for the first configuration and the second configuration, respectively. The first configuration includes at least one of the following: a first target power level, a first maximum number of times, a first power ramp-up step size, a first power ramp-up counter, a first preamble transmission counter, a first parameter 1, and a second parameter 1. The second configuration includes at least one of the following: a second target power level, a second maximum number of times, a second power ramp-up step size, a second power ramp-up counter, a second preamble transmission counter, a first parameter 2, and a second parameter 2. Wherein, the first target power level and the second target power level are usually different. The first maximum number of times and the second maximum number of times can be the same or different; the first power ramp-up step size and the second power ramp-up step size can be the same or different; the first power ramp-up counter and the second power ramp-up counter are usually different; the first preamble transmission counter and the second preamble transmission counter are usually different; the first parameter 1 and the first parameter 2 can be the same or different; and the second parameter 1 and the second parameter 2 can be the same or different.

[0343] In some embodiments, the first receiving module is configured to receive a first configuration parameter and a second configuration parameter, wherein the first configuration parameter corresponds to a first configuration and the second configuration parameter corresponds to a second configuration; or, receive a first configuration parameter and an offset value, wherein the first configuration parameter corresponds to the first configuration and the configuration parameter after offsetting the first configuration parameter based on the offset value corresponds to the second configuration; or, receive a second configuration parameter and an offset value, wherein the second configuration parameter corresponds to the second configuration and the configuration parameter after offsetting the second configuration parameter based on the offset value corresponds to the first configuration; or, receive a first configuration parameter, wherein the first configuration parameter corresponds to the first configuration; or, receive a second configuration parameter, wherein the second configuration parameter corresponds to the second configuration. For example, the first configuration parameter includes a first target power level, and the second configuration parameter includes a second target power level; or, the first configuration includes a first target power level and the offset value includes a target power level offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset; or, the first configuration includes a first target power level and a first power ramp step size, and the offset value includes a target power level offset and a power ramp step size offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset, and the second power ramp step size corresponding to the second configuration is the sum of the first target power ramp step size and the power ramp step size offset.

[0344] In some embodiments, a portion of the relevant parameters are configured by a first configuration parameter and a second configuration parameter; another portion of the relevant parameters are configured by a first configuration parameter and an offset value; or, a first portion of the relevant parameters are configured by a first configuration parameter and a second configuration parameter, a second portion of the relevant parameters are configured by a first configuration parameter and an offset value, and a third portion of the relevant parameters are based on additional network device configuration or protocol agreement. For example, the relevant parameters include a target power level, a maximum number of transmissions of the random access preamble, and a power ramp-up step size of the random access channel; for the target power level, the first configuration parameter (i.e., the first target power level) and a second configuration parameter (i.e., the second target power level) are used for configuration; or, based on additional network device configuration or protocol agreement; or, configured by a first configuration parameter (i.e., the first target power level) and an offset value (i.e., the target power level offset); for the maximum number of transmissions of the random access preamble, the first configuration parameter (i.e., the first maximum number) and a second... The configuration parameters (i.e., the second maximum number of times) are configured; or, based on additional network device configuration or protocol agreement; or, the first configuration parameter (i.e., the first maximum number of times) and the offset value (i.e., the maximum number of times offset) are used for configuration; for the power ramp-up step size of the random access channel, the first configuration parameter (i.e., the first power ramp-up step size) and the second configuration parameter (i.e., the second power ramp-up step size) are used for configuration; or, based on additional network device configuration or protocol agreement; or, the first configuration parameter (i.e., the first power ramp-up step size) and the offset value (i.e., the power ramp-up step size offset) are used for configuration.

[0345] For example, the first configuration parameter includes a first target power level, and the second configuration parameter includes a second target power level; or, the first configuration includes a first target power level and the offset value includes a target power level offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset; or, the first configuration includes a first target power level and a first power ramp step size, and the offset value includes a target power level offset and a power ramp step size offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset, and the second power ramp step size corresponding to the second configuration is the sum of the first target power ramp step size and the power ramp step size offset.

[0346] For example, if the second configuration parameter is the second target power level, denoted as `preambleReceivedTargetPower`, and the offset value is the target power level offset, denoted as `delta_SBFD`, then the first target power level corresponding to the first configuration is `preambleReceivedTargetPower + delta_SBFD`. In this case, the calculation formulas for the first and second transmit power are as follows.

[0347] First transmit power = preambleReceivedTargetPower + delta_SBFD + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0348] Second transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0349] In an optional embodiment, the power configuration of the random access channel can also be implemented as follows: when the time-domain resource type used in the current transmission is different from the time-domain resource type used in the previous transmission, the power ramp-up counter is incremented by 1; an offset count is set and denoted as counter_SBFD. When the time-domain resource type used in the initial transmission is the first type of time-domain resource, the offset count is initialized to 1; when the time-domain resource type used in the initial transmission is the second type of time-domain resource, the offset count is initialized to 0; when the time-domain resource type used in the retransmission is the first type of time-domain resource, the offset count is incremented by 1, i.e., counter_SBFD+1. In this case, the calculation formulas for the first transmission power and the second transmission power are as follows.

[0350] First transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP + counter_SBFD × delta_SBFD.

[0351] Second transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0352] In summary, the apparatus provided in this application provides a first configuration and a second configuration for a random access channel for a terminal device, enabling the terminal device to use the first configuration or the second configuration for random access. Since the first configuration corresponds to a first type of time-domain resource and the second configuration corresponds to a second type of time-domain resource, this allows the terminal device to select different configurations for different time-domain resource types during the random access process.

[0353] 3.2 Configuration Method Two.

[0354] Based on Figure 20 In an optional embodiment, the first receiving module is further configured to receive a third configuration, which is used to configure relevant parameters for random access channel transmission, and the third configuration corresponds to the first type of time domain resources and the second type of time domain resources.

[0355] In some embodiments, when configuring the frequency domain related parameters of the random access channel, a single configuration, namely the third configuration, can be used for both the first type of time domain resources and the second type of time domain resources.

[0356] In some embodiments, the third configuration includes a second parameter; the second parameter indicates the offset between the lowest random access channel transmission opportunity and the reference point in the frequency domain dimension. Specifically, for the first type of time-domain resource, the reference point is the lowest PRB in the frequency domain dimension at the intersection of the uplink subband and the uplink BWP; for the second type of time-domain resource, the reference point is the PRB0 of the uplink BWP.

[0357] In some embodiments, the third configuration further includes a first parameter, which indicates the number of frequency division multiplexing random access channel transmission opportunities in a time unit, such as a time unit being a time instance.

[0358] For example, such as Figure 16 As shown, the third configuration includes a first parameter and a second parameter. The first parameter can be denoted as msg1-FDM, and the second parameter can be denoted as msg1-FrequencyStart. Figure 16Based on the parameters msg1-FDM=2 and msg1-FrequencyStart=0 configured in the third configuration, a set of random access channel transmission opportunities 28 for the first type of time-domain resources and a set of random access channel transmission opportunities 29 for the second type of time-domain resources are selected. The set of random access channel transmission opportunities 28 includes 4 random access channel transmission opportunities, and the set of random access channel transmission opportunities 29 also includes 4 random access channel transmission opportunities. The reference point for the first type of time-domain resources is designated as reference point 30, and the reference point for the second type of time-domain resources is designated as reference point 31. Reference point 30 is the lowest PRB in the frequency domain dimension of the intersection of the uplink subband and the uplink BWP, and reference point 31 is the PRB0 of the uplink BWP.

[0359] In summary, the method provided in this application shares a single configuration for both the first and second types of time-domain resources, thus saving signaling overhead. The terminal device only needs to maintain one configuration and interprets the first and second types of time-domain resources differently, yet it can still ensure that all random access channel transmission opportunities are valid, and that these opportunities occur at both ends of the uplink BWP or uplink subband, avoiding resource fragmentation.

[0360] In some embodiments, the first receiving module in configuration method one and configuration method two can be implemented as the same device or as different devices. That is, some parameters in the relevant parameters can be configured by configuration method one, and other parameters can be configured by configuration method two; or, the first part of the relevant parameters can be configured by configuration method one, the second part can be configured by configuration method two, and the third part can be configured based on additional network device configuration or protocol agreement. For example, configuration method one can be used for power configuration, and configuration method two can be used for frequency domain configuration; or, for the frequency domain configuration of the random access channel, the first type of time domain resource corresponds to the first configuration, the second type of time domain resource corresponds to the second configuration, the first configuration and the second configuration include a first parameter, and the value of the first parameter corresponding to the first configuration is the same as or different from the value of the first parameter corresponding to the second configuration; the first type of time domain resource and the second type of time domain resource correspond to a third configuration, the third configuration includes a second parameter, and the third configuration has different interpretation methods for the first type of time domain resource and the second type of time domain resource. That is, the terminal device determines the number of random access channel transmission opportunities corresponding to the first type of time domain resources and the number of random access channel transmission opportunities corresponding to the second type of time domain resources according to configuration method one, and determines the position of the random access channel transmission opportunities corresponding to the first type of time domain resources and the second type of time domain resources according to configuration method two.

[0361] In some embodiments, a corresponding random access failure judgment method is designed for the case where the terminal device uses a random access preamble transmission counter for the first type of time domain resources and the second type of time domain resources respectively.

[0362] In an optional embodiment, the device further includes a problem reporting module. The problem reporting module is configured to report random access problems based on a first random access preamble transmission counter and a first threshold, or a second random access preamble transmission counter and a second threshold. The first threshold is related to a first maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to a first type of time-domain resource. The second threshold is related to a second maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to a second type of time-domain resource. Alternatively, it can report random access problems based on the first random access preamble transmission counter, the second random access preamble transmission counter, and a third threshold. The third threshold is related to the maximum number of transmissions of the random access preamble corresponding to the first type of time-domain resource and the second time-domain resource class. The random access problem is used to indicate an anomaly in the random access process of the terminal device.

[0363] For the specific process of the random access failure judgment method, please refer to "Failure Judgment Method 1" and "Failure Judgment Method 2" on the method side above, which will not be repeated here.

[0364] Figure 21 This illustration shows a structural block diagram of a transmission apparatus for a random access channel provided in an exemplary embodiment of this application. The apparatus can be implemented as a network device, or as part of a network device, through software, hardware, or a combination of both. The apparatus includes:

[0365] The second receiving module 710 is used to receive a random access channel, which is sent by the terminal device based on the relevant parameters of the random access channel when transmitted in the first type of time domain resources and / or the relevant parameters when transmitted in the second type of time domain resources.

[0366] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific type of time-domain resources is not limited in the embodiments of this application.

[0367] In some embodiments, the first type of time-domain resources and the second type of time-domain resources can be understood as two different duplex modes, time slots, or symbols, etc. The number, location, size, and frequency bandwidth of available uplink resources in the first type of time-domain resources and the second type of time-domain resources are different; or, in other words, the number, location, size, and frequency bandwidth of random access channels in the first type of time-domain resources and the second type of time-domain resources are different. For example, the first type of time-domain resources may be SBFD symbols, and the second type of time-domain resources may be non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0368] In some embodiments, the relevant parameters include at least one of the following: transmit power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; power ramp step size of random access channel; first parameter, which indicates the number of frequency division multiplexing random access channel transmission opportunities in one time unit, such as one time unit being a time instance; second parameter, which indicates the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point, where the reference point is PRB0 of the uplink BWP. Specifically, the transmit power indicates how much energy the terminal device will use to transmit the random access channel; the target power level indicates the target power of the random access channel desired by the network device's receiver; the power ramp counter indicates the number of power ramps, and generally, the power ramp counter increments by 1 after each random access failure; the random access preamble transmission counter indicates the number of preamble transmissions during the random access process, i.e., the number of times the random access channel is transmitted; the maximum number of random access preamble transmissions indicates the maximum number of preamble transmissions during the entire random access process, i.e., the maximum number of times the random access channel is transmitted; and the power ramp step size of the random access channel indicates the amount of power increase during each power ramp.

[0369] For example, such as Figure 6 As shown, the slashed square 10 represents a random access channel transmission opportunity, with the first parameter being 2, indicating that the number of frequency division multiplexing random access channel transmission opportunities in one time unit is 2; if the reference point is the PRB0 of the active UL BWP (active uplink BWP), that is, the starting PRB of the active UL BWP, then Figure 6 The offset between the lowest random access channel transmission opportunity in the frequency domain and PRB0 is the second parameter.

[0370] In some embodiments, the relevant parameters of the random access channel during transmission include power-related parameters and / or frequency-related parameters.

[0371] In some embodiments, power-related parameters include transmit power and power ramp-up counter.

[0372] The specific calculation process for transmission power is the same as the calculation process for transmission power of the terminal device, which will not be elaborated here.

[0373] In some embodiments, the target power level includes a first target power level and a second target power level, a first type of time-domain resource corresponds to the first target power level, and a second type of time-domain resource corresponds to the second target power level.

[0374] In some embodiments, the second receiving module 710 is configured to receive a random access channel, wherein the random access channel transmission opportunity corresponds to a first type of time domain resource, and the first transmission power of the random access channel is determined by the terminal device based on a first target power level; and / or, to receive a random access channel, wherein the random access channel transmission opportunity corresponds to a second type of time domain resource, and the second transmission power of the random access channel is determined by the terminal device based on a second target power level.

[0375] In some embodiments, the first transmit power is determined by the terminal device based on at least one of a first target power level, a power ramp step size, a power ramp counter, and a preamble increment; the second transmit power is determined by the terminal device based on at least one of a second target power level, a power ramp step size, a power ramp counter, and a preamble increment; wherein the preamble increment is determined based on at least one of a random access preamble format and a subcarrier spacing.

[0376] In some embodiments, the first type of time-domain resource corresponds to at least one of a first power ramp-up counter, a first random access preamble transmission counter, and a first power ramp-up step size; the second type of time-domain resource corresponds to at least one of a second power ramp-up counter, a second random access preamble transmission counter, and a second power ramp-up step size.

[0377] In some embodiments, the second receiving module 710 is configured to receive a random access channel, wherein the random access channel transmission opportunity corresponds to a first type of time-domain resource, and the first transmission power of the random access channel is determined by the terminal device based on at least one of a first target power level and a first power ramp-up counter; and / or, to receive a random access channel, wherein the random access channel transmission opportunity corresponds to a second type of time-domain resource, and the second transmission power of the random access channel is determined by the terminal device based on at least one of a second target power level and a second power ramp-up counter. For example, the first type of time-domain resource corresponds to the first power ramp-up counter, and the second type of time-domain resource corresponds to the second power ramp-up counter, but the first type of time-domain resource and the second type of time-domain resource share the same target power level; or, the first type of time-domain resource corresponds to the first target power level, and the second type of time-domain resource corresponds to the second target power level, but the first type of time-domain resource and the second type of time-domain resource share the same power ramp-up counter; or, the first type of time-domain resource corresponds to both the first target power level and the first power ramp-up counter, and the second type of time-domain resource corresponds to both the second target power level and the second power ramp-up counter.

[0378] In some embodiments, the first transmit power is determined by the terminal device based on at least one of a first target power level, a first power ramp step size, a first power ramp counter, and a preamble increment; the second transmit power is determined by the terminal device based on at least one of a second target power level, a second power ramp step size, a second power ramp counter, and a preamble increment; wherein the preamble increment is determined based on at least one of a random access preamble format and a subcarrier spacing.

[0379] The following section illustrates different ramp-up modes of the power ramp-up counter in the terminal device.

[0380] In some embodiments, for random access channel transmission, if the corresponding time-domain resource type changes compared to the previous transmission, the terminal device keeps the power ramp-up counter unchanged.

[0381] In some embodiments, for random access channel transmission, if the corresponding time-domain resource type changes compared to the previous transmission, the terminal device resets or initializes the power ramp-up counter.

[0382] In some embodiments, when the random access procedure is initiated, the terminal device initializes at least one of a first power ramp-up counter, a first random access preamble transmission counter, a second power ramp-up counter, and a second random access preamble transmission counter. If the random access channel transmission fails and the random access channel corresponds to a first type of time-domain resource, the first random access preamble transmission counter in the terminal device is incremented by 1. If the random access channel transmission fails and the random access channel corresponds to a second type of time-domain resource, the second random access preamble transmission counter in the terminal device is incremented by 1. If the random access channel corresponds to a first type of time-domain resource and the first random access preamble transmission counter is greater than a first initial value, the first power ramp-up counter in the terminal device is incremented by 1. If the random access channel corresponds to a second type of time-domain resource and the second random access preamble transmission counter is greater than a second initial value, the second power ramp-up counter in the terminal device is incremented by 1. Here, random access channel transmission failure indicates that if the RAR window times out but no random access response containing the first random access preamble identifier is received, or if contention resolution is unsuccessful, then the random access channel transmission is considered to have failed. The first random access preamble identifier matches the random access channel preamble index (PRACH preamble index) sent by the terminal.

[0383] In some embodiments, the initial transmission and retransmission of the random access channel correspond to the same time-domain resource type; or, the terminal device does not expect the retransmission of the random access channel to change the corresponding time-domain resource type relative to the initial transmission or the previous transmission; or, the terminal device does not expect the time-domain resource type corresponding to the retransmission of the random access channel to be different from the time-domain resource type corresponding to the initial transmission of the random access channel or the previous transmission of the random access channel.

[0384] In some embodiments, the apparatus further includes a problem receiving module. The problem receiving module is configured to receive random access problems reported by the terminal device. The random access problems are reported based on a first random access preamble transmission counter and a first threshold, or a second random access preamble transmission counter and a second threshold. The first threshold is related to a first maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to a first type of time-domain resource. The second threshold is related to a second maximum number of transmissions, which is the maximum number of transmissions of the random access preamble corresponding to a second type of time-domain resource. Alternatively, the device may receive random access problems reported by the terminal device, which are reported based on a first random access preamble transmission counter, a second random access preamble transmission counter, and a third threshold. The third threshold is related to the maximum number of transmissions of the random access preamble corresponding to the first type of time-domain resource and the second time-domain resource class. The random access problems are used to indicate that there is an anomaly in the random access process of the terminal device.

[0385] In some embodiments, a random access channel (RID) transmission opportunity is valid if: the RID transmission opportunity is within an uplink symbol; or, the RID transmission opportunity is within a first type of time-domain resource and located within a first frequency-domain bandwidth, for example, the RID transmission opportunity is within an SBFD symbol and located at the intersection of an uplink subband and an uplink BWP. Here, the first type of time-domain resource is an SBFD symbol; "the RID transmission opportunity is within an uplink symbol" means that the symbols containing the RID transmission opportunity are all uplink symbols; "the RID transmission opportunity is within a first type of time-domain resource" means that the symbols containing the RID transmission opportunity are all SBFD symbols; that is, if a RID transmission opportunity is located in symbols that include both uplink symbols and SBFD symbols, then this RID transmission opportunity is invalid.

[0386] In some embodiments, the first frequency domain bandwidth is a subset of the available uplink bandwidth configured by the network device for the terminal device; the first frequency domain bandwidth is the actual available uplink bandwidth determined in the uplink BWP of the terminal device based on the first duplex mode or the first type of time domain resource. The first duplex mode or the first type of time domain resource may be SBFD.

[0387] In some embodiments, the uplink BWP is an uplink BWP activated for uplink transmission of the terminal device. The first frequency domain bandwidth is the total bandwidth or a portion of the bandwidth of the uplink BWP. Due to the different available uplink subbands in different duplex modes or different time domain resource types, the first frequency domain bandwidth may be dynamically changing even for the same terminal device.

[0388] In some embodiments, the first frequency domain bandwidth can be understood as the available subband, available uplink subband, actual available subband, or actual available uplink subband in the uplink BWP.

[0389] In summary, the apparatus provided in this application embodiment allows the network device to receive a random access channel. The random access channel is sent by the terminal device based on the relevant parameters of the random access channel when transmitted in the first type of time domain resource and / or the relevant parameters when transmitted in the second type of time domain resource. That is, the random access channel received by the network device is determined by the terminal device based on different relevant parameters corresponding to different time domain resource types.

[0390] In an optional embodiment, the first frequency domain bandwidth is a portion of the available subband within the uplink BWP. The first frequency domain bandwidth is the actual available uplink bandwidth of the terminal device. For a detailed description of the first frequency domain bandwidth, please refer to "1. First Frequency Domain Bandwidth" above, and it will not be repeated here.

[0391] In some embodiments, the network device provides differentiated configurations for terminal devices for a first type of time-domain resources and / or a second type of time-domain resources. There are two configuration methods, which will be described separately below.

[0392] 4.1 Configuration Method 1.

[0393] Based on Figure 21 In an alternative embodiment, the device further includes a second transmitting module.

[0394] The second transmitting module is used to transmit a first configuration and a second configuration. The first configuration and the second configuration are used to configure relevant parameters for transmission through the random access channel. The first configuration corresponds to a first type of time-domain resource, and the second configuration corresponds to a second type of time-domain resource.

[0395] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific types of time-domain resources are not limited in the embodiments of this application; typically, a first configuration corresponds to a first type of symbol, and a second configuration corresponds to a second type of symbol for illustrative purposes. For example, the first configuration corresponds to SBFD symbols, and the second configuration corresponds to non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0396] In some embodiments, the configuration of the random access channel includes at least one of a power configuration and a frequency domain configuration. The power configuration is used to configure power-related parameters during random access channel transmission, and the frequency domain configuration is used to configure frequency-related parameters during random access channel transmission. A first configuration includes at least one of a first power configuration and a first frequency domain configuration; a second configuration includes at least one of a second power configuration and a second frequency domain configuration. The configuration items included in the first configuration and the second configuration are the same; that is, if the first configuration includes the first power configuration, the second configuration should also include the second power configuration; if the first configuration includes the first frequency domain configuration, the second configuration should also include the second frequency domain configuration; if the first configuration includes both the first power configuration and the first frequency domain configuration, the second configuration should also include both the second power configuration and the second frequency domain configuration.

[0397] In some embodiments, the power configuration includes at least one of the following related parameters: target power level; maximum number of transmissions of the random access preamble; power ramp-up step size of the random access channel; that is, either the first configuration or the second configuration includes at least one of the following related parameters: target power level; maximum number of transmissions of the random access preamble; power ramp-up step size of the random access channel.

[0398] In some embodiments, the power-related parameters include at least one of the following parameters: transmit power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; and power ramp step size of random access channel.

[0399] In some embodiments, the first configuration and the second configuration include only parameters with different values. Parameters with the same values ​​in the first and second configurations can be additionally configured by the network device or agreed upon by the communication protocol. For example, the first configuration includes a first target power level, the second configuration includes a second target power level, the maximum number of transmissions of the random access preamble and the power ramp-up step size of the random access channel are additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level and a first power ramp-up step size, the second configuration includes a second target power level and a second power ramp-up step size, the maximum number of transmissions of the random access preamble is additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level and a first maximum number of transmissions, the second configuration includes a second target power level and a second maximum number of transmissions, the power ramp-up step size of the random access channel is additionally configured by the network device or agreed upon by the communication protocol; or, the first configuration includes a first target power level, a first maximum number of transmissions and a first power ramp-up step size, the second configuration includes a second target power level, a second maximum number of transmissions and a second power ramp-up step size.

[0400] In some embodiments, the first configuration and the second configuration include all parameters. That is, the first configuration includes a first target power level, a first maximum number of attempts, and a first power ramp-up step size, and the second configuration includes a second target power level, a second maximum number of attempts, and a second power ramp-up step size. The first maximum number of attempts may be the same as or different from the second maximum number of attempts, and the first power ramp-up step size may be the same as or different from the second power ramp-up step size.

[0401] In some embodiments, the first configuration and the second configuration share some related parameters. For example, such as... Figure 14 As shown, the terminal device uses a set of power ramp-up counters and preamble transmission counters for both the first and second configurations. The shared parameters for both configurations are the power ramp-up counter and the preamble transmission counter. The first configuration includes at least one of the following: a first target power level, a first maximum number of ramps, a first power ramp-up step size, a first parameter 1, and a second parameter 1. The second configuration includes at least one of the following: a second target power level, a second maximum number of ramps, a second power ramp-up step size, a first parameter 2, and a second parameter 2. The first target power level and the second target power level are typically different. The first maximum number of ramps and the second maximum number of ramps can be the same or different; the first power ramp-up step size and the second power ramp-up step size can be the same or different; the first parameter 1 and the first parameter 2 can be the same or different; and the second parameter 1 and the second parameter 2 can be the same or different.

[0402] In some embodiments, the first configuration and the second configuration do not share related parameters. For example, such as... Figure 15 As shown. The terminal device uses a power ramp-up counter and a preamble transmission counter for the first configuration and the second configuration, respectively. The first configuration includes at least one of the following: a first target power level, a first maximum number of times, a first power ramp-up step size, a first power ramp-up counter, a first preamble transmission counter, a first parameter 1, and a second parameter 1. The second configuration includes at least one of the following: a second target power level, a second maximum number of times, a second power ramp-up step size, a second power ramp-up counter, a second preamble transmission counter, a first parameter 2, and a second parameter 2. Wherein, the first target power level and the second target power level are usually different. The first maximum number of times and the second maximum number of times can be the same or different; the first power ramp-up step size and the second power ramp-up step size can be the same or different; the first power ramp-up counter and the second power ramp-up counter are usually different; the first preamble transmission counter and the second preamble transmission counter are usually different; the first parameter 1 and the first parameter 2 can be the same or different; and the second parameter 1 and the second parameter 2 can be the same or different.

[0403] In some embodiments, the frequency domain configuration includes at least one of the following related parameters: a first parameter indicating the number of frequency-division multiplexed random access channel transmission opportunities in a time unit, such as a time unit being a time instance; and a second parameter indicating the offset between the lowest random access channel transmission opportunity and the reference point in the frequency domain dimension. That is, either the first configuration or the second configuration includes at least one of the following related parameters: a first parameter indicating the number of frequency-division multiplexed random access channel transmission opportunities in a time unit, such as a time unit being a time instance; and a second parameter indicating the offset between the lowest random access channel transmission opportunity and the reference point in the frequency domain dimension.

[0404] In some embodiments, the second sending module is configured to send a first configuration parameter and a second configuration parameter, wherein the first configuration parameter corresponds to a first configuration and the second configuration parameter corresponds to a second configuration; or, send a first configuration parameter and an offset value, wherein the first configuration parameter corresponds to the first configuration and the configuration parameter after offsetting the first configuration parameter based on the offset value corresponds to the second configuration; or, send a second configuration parameter and an offset value, wherein the second configuration parameter corresponds to the second configuration and the configuration parameter after offsetting the second configuration parameter based on the offset value corresponds to the first configuration; or, send a first configuration parameter, wherein the first configuration parameter corresponds to the first configuration; or, send a second configuration parameter, wherein the second configuration parameter corresponds to the second configuration. For example, the first configuration parameter includes a first target power level, and the second configuration parameter includes a second target power level; or, the first configuration includes a first target power level and the offset value includes a target power level offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset; or, the first configuration includes a first target power level and a first power ramp step size, and the offset value includes a target power level offset and a power ramp step size offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset, and the second power ramp step size corresponding to the second configuration is the sum of the first target power ramp step size and the power ramp step size offset.

[0405] In some embodiments, a portion of the relevant parameters are configured by a first configuration parameter and a second configuration parameter; another portion of the relevant parameters are configured by a first configuration parameter and an offset value; or, a first portion of the relevant parameters are configured by a first configuration parameter and a second configuration parameter, a second portion of the relevant parameters are configured by a first configuration parameter and an offset value, and a third portion of the relevant parameters are based on additional network device configuration or protocol agreement. For example, the relevant parameters include a target power level, a maximum number of transmissions of the random access preamble, and a power ramp-up step size of the random access channel; for the target power level, the first configuration parameter (i.e., the first target power level) and a second configuration parameter (i.e., the second target power level) are used for configuration; or, based on additional network device configuration or protocol agreement; or, configured by a first configuration parameter (i.e., the first target power level) and an offset value (i.e., the target power level offset); for the maximum number of transmissions of the random access preamble, the first configuration parameter (i.e., the first maximum number) and a second... The configuration parameters (i.e., the second maximum number of times) are configured; or, based on additional network device configuration or protocol agreement; or, the first configuration parameter (i.e., the first maximum number of times) and the offset value (i.e., the maximum number of times offset) are used for configuration; for the power ramp-up step size of the random access channel, the first configuration parameter (i.e., the first power ramp-up step size) and the second configuration parameter (i.e., the second power ramp-up step size) are used for configuration; or, based on additional network device configuration or protocol agreement; or, the first configuration parameter (i.e., the first power ramp-up step size) and the offset value (i.e., the power ramp-up step size offset) are used for configuration.

[0406] For example, the first configuration parameter includes a first target power level, and the second configuration parameter includes a second target power level; or, the first configuration includes a first target power level and the offset value includes a target power level offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset; or, the first configuration includes a first target power level and a first power ramp step size, and the offset value includes a target power level offset and a power ramp step size offset, then the second target power level corresponding to the second configuration is the sum of the first target power level and the target power level offset, and the second power ramp step size corresponding to the second configuration is the sum of the first target power ramp step size and the power ramp step size offset.

[0407] For example, if the second configuration parameter is the second target power level, denoted as `preambleReceivedTargetPower`, and the offset value is the target power level offset, denoted as `delta_SBFD`, then the first target power level corresponding to the first configuration is `preambleReceivedTargetPower + delta_SBFD`. In this case, the calculation formulas for the first and second transmit power are as follows.

[0408] First transmit power = preambleReceivedTargetPower + delta_SBFD + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0409] Second transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0410] In an optional embodiment, the power configuration of the random access channel can also be implemented as follows: when the time-domain resource type used in the current transmission is different from the time-domain resource type used in the previous transmission, the power ramp-up counter is incremented by 1; an offset count is set and denoted as counter_SBFD. When the time-domain resource type used in the initial transmission is the first type of time-domain resource, the offset count is initialized to 1; when the time-domain resource type used in the initial transmission is the second type of time-domain resource, the offset count is initialized to 0; when the time-domain resource type used in the retransmission is the first type of time-domain resource, the offset count is incremented by 1, i.e., counter_SBFD+1. In this case, the calculation formulas for the first transmission power and the second transmission power are as follows.

[0411] First transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP + counter_SBFD × delta_SBFD.

[0412] Second transmit power = preambleReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_POWER_RAMPING_COUNTER – 1) × PREAMBLE_POWER_RAMPING_STEP.

[0413] In summary, the apparatus provided in this application embodiment allows the network device to perform random access by sending a first configuration and a second configuration of the random access channel to the terminal device. Since the first configuration corresponds to a first type of time-domain resource and the second configuration corresponds to a second type of time-domain resource, the terminal device can select different configurations for different time-domain resource types during the random access process.

[0414] 4.2 Configuration Method Two.

[0415] Based on Figure 21 In an optional embodiment, the second sending module is further configured to send a third configuration, which is used to configure relevant parameters for random access channel transmission, and the third configuration corresponds to the first type of time domain resources and the second type of time domain resources.

[0416] In some embodiments, when configuring the frequency domain related parameters of the random access channel, a single configuration, namely the third configuration, can be used for both the first type of time domain resources and the second type of time domain resources.

[0417] In some embodiments, the third configuration includes a second parameter; the second parameter indicates the offset between the lowest random access channel transmission opportunity and the reference point in the frequency domain dimension. Specifically, for the first type of time-domain resource, the reference point is the lowest PRB in the frequency domain dimension at the intersection of the uplink subband and the uplink BWP; for the second type of time-domain resource, the reference point is the PRB0 of the uplink BWP.

[0418] In some embodiments, the third configuration further includes a first parameter, which indicates the number of frequency division multiplexing random access channel transmission opportunities in a time unit, such as a time unit being a time instance.

[0419] For example, such as Figure 16 As shown, the third configuration includes a first parameter and a second parameter. The first parameter can be denoted as msg1-FDM, and the second parameter can be denoted as msg1-FrequencyStart. Figure 16 Based on the parameters msg1-FDM=2 and msg1-FrequencyStart=0 configured in the third configuration, a set of random access channel transmission opportunities 28 for the first type of time-domain resources and a set of random access channel transmission opportunities 29 for the second type of time-domain resources are selected. The set of random access channel transmission opportunities 28 includes 4 random access channel transmission opportunities, and the set of random access channel transmission opportunities 29 also includes 4 random access channel transmission opportunities. The reference point for the first type of time-domain resources is designated as reference point 30, and the reference point for the second type of time-domain resources is designated as reference point 31. Reference point 30 is the lowest PRB in the frequency domain dimension of the intersection of the uplink subband and the uplink BWP, and reference point 31 is the PRB0 of the uplink BWP.

[0420] In summary, the apparatus provided in this application allows the network device to configure only one set of settings for the first type of time domain resources and the second type of time domain resources, thus saving signaling overhead. The terminal device only needs to maintain one set of settings and interprets the first type of time domain resources and the second type of time domain resources differently, still ensuring that all random access channel transmission opportunities are valid, and also ensuring that random access channel transmission opportunities occur at both ends of the uplink BWP or uplink subband, avoiding resource fragmentation.

[0421] In some embodiments, the second transmitting module in configuration method one and configuration method two can be implemented as the same device or as different devices. That is, some parameters in the relevant parameters can be configured by configuration method one, and other parameters can be configured by configuration method two; or, the first part of the relevant parameters can be configured by configuration method one, the second part of the parameters can be configured by configuration method two, and the third part of the parameters can be based on additional network device configuration or protocol agreement. For example, for the frequency domain configuration of the random access channel, the first type of time domain resource corresponds to the first configuration, the second type of time domain resource corresponds to the second configuration, the first configuration and the second configuration include a first parameter, and the value of the first parameter corresponding to the first configuration is the same as or different from the value of the first parameter corresponding to the second configuration; the first type of time domain resource and the second type of time domain resource correspond to a third configuration, the third configuration includes a second parameter, and the third configuration has different interpretation methods for the first type of time domain resource and the second type of time domain resource. That is, the terminal device configures the number of random access channel transmission opportunities corresponding to the first type of time domain resources and the number of random access channel transmission opportunities corresponding to the second type of time domain resources according to the instructions of the second transmission module in configuration method one, and configures the positions of the random access channel transmission opportunities corresponding to the first type of time domain resources and the second type of time domain resources according to the instructions of the second transmission module in configuration method one.

[0422] Figure 22 This illustration shows a structural block diagram of a transmission apparatus for a random access channel provided in an exemplary embodiment of this application. The apparatus can be implemented as a terminal device, or as part of a terminal device, through software, hardware, or a combination of both. The apparatus includes:

[0423] The third receiving module 810 is used to receive at least one of the first configuration, the second configuration and the third configuration. The first configuration, the second configuration and the third configuration are used to configure relevant parameters for random access channel transmission. The first configuration corresponds to a first type of time domain resource, the second configuration corresponds to a second type of time domain resource, and the third configuration corresponds to both the first type of time domain resource and the second type of time domain resource.

[0424] In some embodiments, time-domain resources include at least one of the following: symbols, symbol groups, time slots, sub-time slots, frames, and subframes. The specific type of time-domain resources is not limited in the embodiments of this application.

[0425] In some embodiments, the first type of time-domain resources and the second type of time-domain resources can be understood as two different duplex modes, time slots, or symbols, etc. The number, location, size, and frequency bandwidth of available uplink resources in the first type of time-domain resources and the second type of time-domain resources are different; or, in other words, the number, location, size, and frequency bandwidth of random access channels in the first type of time-domain resources and the second type of time-domain resources are different. For example, the first type of time-domain resources may be SBFD symbols, and the second type of time-domain resources may be non-SBFD symbols. Here, SBFD symbols include at least one of uplink subbands, downlink subbands, and guard bands, while non-SBFD symbols do not include any of the above subbands.

[0426] In some embodiments, the terminal device receives a first configuration and a second configuration; or, the terminal device receives a third configuration; or, the terminal device receives a first configuration, a second configuration, and a third configuration.

[0427] The first, second, and third configurations received by the terminal device are described in "3.1 Configuration Method 1" and "3.2 Configuration Method 2" above, and will not be repeated here.

[0428] In summary, the apparatus provided in this application allows the terminal device to receive at least one of a first configuration, a second configuration, and a third configuration before transmitting through a random access channel. The first, second, and third configurations are used to configure relevant parameters for random access channel transmission. The first configuration corresponds to a first type of time-domain resource, the second configuration corresponds to a second type of time-domain resource, and the third configuration corresponds to both the first and second types of time-domain resources. The first and second configurations correspond to separate configurations, while the third configuration corresponds to a combined configuration. Whether configured separately or jointly, the terminal device can select different configurations for different time-domain resource types during random access.

[0429] Figure 23 This illustration shows a structural block diagram of a transmission apparatus for a random access channel provided in an exemplary embodiment of this application. The apparatus can be implemented as a terminal device, or as part of a terminal device, through software, hardware, or a combination of both. The apparatus includes:

[0430] Transmission module 910 is used to transmit a random access channel on a valid random access channel transmission opportunity;

[0431] A random access channel transmission opportunity is valid if: the random access channel transmission opportunity is within an uplink symbol; or, the random access channel transmission opportunity is within a first type of time domain resource and the random access channel transmission opportunity is within a first frequency domain bandwidth.

[0432] For example, a random access channel (RAVC) transmission opportunity may occur within the first type of time domain resources, and the RAVC transmission opportunity may be located within the intersection of the uplink subband and the uplink BWP. Here, the first type of time domain resources are SBFD symbols; "the RAVC transmission opportunity is within the uplink symbols" means that the symbols containing the RAVC transmission opportunity are all uplink symbols; "the RAVC transmission opportunity is within the first type of time domain resources" means that the symbols containing the RAVC transmission opportunity are all SBFD symbols; that is, if a RAVC transmission opportunity is located in symbols that include both uplink symbols and SBFD symbols, then this RAVC transmission opportunity is invalid.

[0433] In some embodiments, the first frequency domain bandwidth is a subset of the available uplink bandwidth configured by the network device for the terminal device; the first frequency domain bandwidth is the actual available uplink bandwidth determined in the uplink BWP of the terminal device based on the first duplex mode or the first type of time domain resource. The first duplex mode or the first type of time domain resource may be SBFD.

[0434] In some embodiments, the uplink BWP is an uplink BWP activated for uplink transmission of the terminal device. The first frequency domain bandwidth is the total bandwidth or a portion of the bandwidth of the uplink BWP. Due to the different available uplink subbands in different duplex modes or different time domain resource types, the first frequency domain bandwidth may be dynamically changing even for the same terminal device.

[0435] In some embodiments, the first frequency domain bandwidth can be understood as the available subband, available uplink subband, actual available subband, or actual available uplink subband in the uplink BWP.

[0436] In some embodiments, the first frequency domain bandwidth is a portion of the available subband within the uplink BWP. The first frequency domain bandwidth is the actual available uplink bandwidth of the terminal device. For a detailed description of the first frequency domain bandwidth, please refer to "1. First Frequency Domain Bandwidth" above, and it will not be repeated here.

[0437] In summary, the apparatus provided in this application demonstrates that the transmission condition of the random access channel is transmission on a valid random access channel transmission opportunity, and provides the transmission conditions for a valid random access channel transmission opportunity, enabling the terminal device to successfully transmit during random access channel transmission.

[0438] It should be noted that the device provided in the above embodiments is only an example of the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0439] Regarding the apparatus in this embodiment, the specific manner in which each module performs its operations has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0440] Figure 24 A schematic diagram of a terminal device provided in an exemplary embodiment of this application is shown. The terminal device 1000 can be used to execute the method steps performed by the terminal device in the above embodiments. The terminal device 1000 may include: a processor 1001, a transceiver 1002, and a memory 1003. The processor 1001 can be used to control sending and / or receiving. The transceiver 1002 can be used to implement sending and / or receiving functions, such as implementing the functions of at least one of the first sending module 610, the first receiving module, the problem reporting module, the third receiving module 810, and the transmission module 910 described above.

[0441] The processor 1001 includes one or more processing cores. The processor 1001 executes various functional applications and information processing by running software programs and modules.

[0442] The transceiver 1002 may include a receiver and a transmitter. For example, the receiver and transmitter may be implemented as the same wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

[0443] The memory 1003 can be connected to the processor 1001 and the transceiver 1002.

[0444] The memory 1003 can be used to store a computer program executed by the processor, and the processor 1001 is used to execute the computer program to implement the various steps in the above method embodiments.

[0445] Furthermore, the memory 1003 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory, erasable programmable read-only memory, static on-demand memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0446] In some embodiments, the processor 1001 is configured to transmit a random access channel based on relevant parameters when the random access channel is transmitted in a first type of time domain resource and / or relevant parameters when it is transmitted in a second type of time domain resource.

[0447] In some embodiments, the processor 1001 is configured to receive at least one of a first configuration, a second configuration, and a third configuration, wherein the first configuration, the second configuration, and the third configuration are configured to configure relevant parameters for random access channel transmission, wherein the first configuration corresponds to a first type of time domain resource, the second configuration corresponds to a second type of time domain resource, and the third configuration corresponds to both the first type of time domain resource and the second type of time domain resource.

[0448] In some embodiments, the processor 1001 is configured to transmit a random access channel on a valid random access channel transmission opportunity.

[0449] For details not described in this embodiment, please refer to the embodiments above, which will not be repeated here.

[0450] Figure 25 A schematic diagram of a network device provided in an exemplary embodiment of this application is shown. The network device 1100 can be used to execute the method steps performed by the network device in the above embodiments. The network device 1100 may include: a processor 1101, a transceiver 1102, and a memory 1103. The processor 1101 can be used to control transmission and / or reception. The transceiver 1102 can be used to implement transmission and / or reception functions, such as implementing the functions of at least one of the second receiving module 710, the problem receiving module, and the second transmitting module described above.

[0451] The processor 1101 includes one or more processing cores. The processor 1101 executes various functional applications and information processing by running software programs and modules.

[0452] Transceiver 1102 may include a receiver and a transmitter. For example, transceiver 1102 may include a wired communication component, which may include a wired communication chip and a wired interface (such as a fiber optic interface). Optionally, transceiver 1102 may also include a wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

[0453] The memory 1103 can be connected to the processor 1101 and the transceiver 1102.

[0454] The memory 1103 can be used to store a computer program executed by the processor, and the processor 1101 is used to execute the computer program to implement the various steps performed by the network device in the above method embodiment.

[0455] Furthermore, memory 1103 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic disks or optical disks, electrically erasable programmable read-only memory, erasable programmable read-only memory, static on-demand memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0456] In some embodiments, the processor 1101 is configured to receive a random access channel, which is sent by the terminal device based on relevant parameters when the random access channel is transmitted in a first type of time domain resource and / or relevant parameters when it is transmitted in a second type of time domain resource.

[0457] For details not described in this embodiment, please refer to the embodiments above, which will not be repeated here.

[0458] This application also provides a computer-readable storage medium storing a computer program for execution by a processor to implement the aforementioned random access channel transmission method. In some embodiments, the computer-readable storage medium may include ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives), or optical disc, etc. The random access memory may include ReRAM (Resistance Random Access Memory) and DRAM (Dynamic Random Access Memory).

[0459] This application also provides a chip, which includes programmable logic circuits and / or program instructions, and when the chip is running, it is used to implement the above-described random access channel transmission method.

[0460] This application also provides a computer program product, which includes a computer program stored in a computer-readable storage medium. A processor reads from the computer-readable storage medium and executes the computer program to implement the above-described random access channel transmission method.

[0461] It should be understood that the term "instruction" mentioned in the embodiments of this application can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0462] In the description of the embodiments of this application, the term "correspondence" may indicate that there is a direct or indirect correspondence between two things, or that there is an association between two things, or that there is a relationship of instruction and being instructed, configuration and being configured, etc.

[0463] In this article, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0464] In this article, "greater than or equal to" can mean greater than or equal to, and "less than or equal to" can mean less than or equal to.

[0465] Furthermore, the step numbers described herein are merely illustrative of one possible execution order between steps. In some other embodiments, the steps may not be executed in the order of their numbers, such as two steps with different numbers being executed simultaneously, or two steps with different numbers being executed in the reverse order of the illustration. This application does not limit this.

[0466] Those skilled in the art will recognize that the functions described in the embodiments of this application in one or more of the above examples can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0467] The above are merely exemplary embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

1. A transmission method for a random access channel, characterized in that, The method includes: The random access channel is transmitted according to the relevant parameters of the random access channel when transmitted in the first type of time domain resource and / or the relevant parameters when transmitted in the second type of time domain resource.

2. The method according to claim 1, characterized in that, The relevant parameters include at least one of the following: transmission power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; power ramp step size of the random access channel; and a first parameter, which indicates the number of transmission opportunities of the frequency division multiplexed random access channel in one time unit. The second parameter indicates the offset between the lowest random access channel transmission opportunity and the reference point in the frequency domain.

3. The method according to claim 2, characterized in that, The target power level includes a first target power level and a second target power level, the first type of time domain resources corresponds to the first target power level, and the second type of time domain resources corresponds to the second target power level; The step of transmitting the random access channel based on the relevant parameters of the random access channel when transmitted in the first type of time domain resource and / or the relevant parameters when transmitted in the second type of time domain resource includes: When the random access channel transmission opportunity corresponds to the first type of time domain resource, the random access channel is transmitted, and the first transmission power of the random access channel is determined based on the first target power level; and / or, when the random access channel transmission opportunity corresponds to the second type of time domain resource, the random access channel is transmitted, and the second transmission power of the random access channel is determined based on the second target power level.

4. The method according to claim 3, characterized in that, The first transmit power is determined based on at least one of the first target power level, the power ramp step size, the value of the power ramp counter, and the preamble increment; the second transmit power is determined based on at least one of the second target power level, the power ramp step size, the value of the power ramp counter, and the preamble increment; wherein the preamble increment is determined based on at least one of the random access preamble format and the subcarrier spacing.

5. The method according to any one of claims 1 to 4, characterized in that, The method further includes: A third configuration is received, which is used to configure relevant parameters during the transmission of the random access channel. The third configuration corresponds to the first type of time domain resource and the second type of time domain resource.

6. The method according to claim 5, characterized in that, The third configuration includes a second parameter, which indicates the offset between the lowest random access channel transmission opportunity in the frequency domain and the reference point; wherein, for the first type of time domain resource, the reference point is the lowest physical resource block (PRB) of the first frequency domain bandwidth in the frequency domain; and for the second type of time domain resource, the reference point is the PRB0 of the uplink BWP.

7. The method according to any one of claims 1 to 6, characterized in that, A random access channel transmission opportunity is valid if: the random access channel transmission opportunity is within an uplink symbol; or, the random access channel transmission opportunity is within a first type of time domain resource and the random access channel transmission opportunity is within a first frequency domain bandwidth.

8. The method according to claim 6 or 7, characterized in that, The first frequency domain bandwidth includes at least one of the following: an uplink subband; the intersection of the uplink subband and the uplink BWP; and a true uplink subband, wherein the true uplink subband is the intersection of the uplink subband and the uplink BWP. The true uplink BWP is the intersection of the uplink subband and the uplink BWP. The uplink sub-band portion within the uplink BWP; The available uplink subband portion within the uplink BWP; The uplink subband portion of the uplink BWP within the first type of time-domain resource; The available uplink subband portion of the uplink BWP within the first type of time-domain resource.

9. A transmission method for a random access channel, characterized in that, The method includes: The random access channel is received, which is transmitted based on relevant parameters when the random access channel is transmitted in a first type of time domain resource and / or a second type of time domain resource.

10. The method according to claim 9, characterized in that, The relevant parameters include at least one of the following: transmission power; target power level; value of power ramp counter; value of random access preamble transmission counter; maximum number of transmissions of random access preamble; power ramp step size of the random access channel; and a first parameter, which indicates the number of transmission opportunities of the frequency division multiplexed random access channel in one time unit. The second parameter indicates the offset between the lowest random access channel transmission opportunity and the reference point in the frequency domain.

11. The method according to claim 9 or 10, characterized in that, The method further includes: Send a third configuration for the random access channel, the third configuration being used to configure relevant parameters during transmission of the random access channel, the third configuration corresponding to the first type of time domain resources and the second type of time domain resources.

12. The method according to claim 11, characterized in that, The third configuration includes a second parameter, which indicates the offset between the lowest random access channel transmission opportunity in the frequency domain and a reference point; wherein, for the first type of time domain resource, the reference point is the lowest physical resource block (PRB) of the first frequency domain bandwidth in the frequency domain, and for the second type of time domain resource, the reference point is the PRB0 of the uplink BWP.

13. The method according to any one of claims 9 to 12, characterized in that, A random access channel transmission opportunity is valid if: the random access channel transmission opportunity is within an uplink symbol; or, the random access channel transmission opportunity is within a first type of time domain resource and the random access channel transmission opportunity is within a first frequency domain bandwidth.

14. The method according to claim 12 or 13, characterized in that, The first frequency domain bandwidth includes at least one of the following: an uplink subband; the intersection of the uplink subband and the uplink BWP; and a true uplink subband, wherein the true uplink subband is the intersection of the uplink subband and the uplink BWP. The true uplink BWP is the intersection of the uplink subband and the uplink BWP. The uplink sub-band portion within the uplink BWP; The available uplink subband portion within the uplink BWP; The uplink subband portion of the uplink BWP within the first type of time-domain resource; The available uplink subband portion of the uplink BWP within the first type of time-domain resource.

15. A terminal device, characterized in that, The terminal device includes: Processor; transceiver connected to the processor; memory for storing executable instructions of the processor; The processor is configured to load and execute the executable instructions to implement the transmission method of the random access channel as described in any one of claims 1 to 8.

16. A network device, characterized in that, The network device includes: Processor; transceiver connected to the processor; memory for storing executable instructions of the processor; The processor is configured to load and execute the executable instructions to implement the transmission method of the random access channel as described in any one of claims 9 to 14.

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