Prach transmission method, apparatus, and terminal

Abstract

The application discloses a PRACH transmission method, device and terminal, and belongs to the communication technical field. The PRACH transmission method of the application embodiment comprises the following steps: a terminal determines the transmission power of PRACH (Physical Random Access Channel) repeated transmission according to a target indication, wherein the target indication is used for indicating whether the transmission power of PRACH transmission in the PRACH repeated transmission is the same; and the terminal performs PRACH repeated transmission according to the transmission power of the PRACH repeated transmission.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a PRACH transmission method, apparatus and terminal. Background Technology

[0002] Retransmission of the Physical Random Access Channel (PRACH) is a method to improve PRACH coverage. User equipment (UE) typically chooses to retransmit PRACH under conditions of poor coverage. The initial power of existing PRACH transmissions takes into account all terminals in the cell, including those with and without coverage limitations, and usually does not reach the maximum power. It only reaches the maximum value after multiple retransmissions and power ramp-up.

[0003] Currently, it is unclear how to determine the transmit power of each PRACH transmission in a PRACH repetition transmission. Summary of the Invention

[0004] This application provides a PRACH transmission method, apparatus, and terminal, which can solve the problem of how to determine the transmission power of each PRACH transmission in the PRACH repetitive transmission in related technologies.

[0005] Firstly, a PRACH transmission method is provided, including:

[0006] The terminal determines the transmission power of repeated transmissions of the Physical Random Access Channel (PRACH) based on the target indication, wherein the target indication is used to indicate whether the transmission power of PRACH transmissions in repeated PRACH transmissions is the same;

[0007] The terminal performs PRACH retransmission based on the transmission power of the PRACH retransmission.

[0008] Secondly, a PRACH transmission device is provided, comprising:

[0009] The determination module is used to determine the transmission power of repeated transmissions of the Physical Random Access Channel (PRACH) based on a target indication, wherein the target indication is used to indicate whether the transmission power of the PRACH transmissions in the repeated PRACH transmissions is the same;

[0010] The transmission module is used to perform PRACH repetitive transmission according to the transmission power of the PRACH repetitive transmission.

[0011] Thirdly, a terminal is provided, comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method described in the first aspect.

[0012] Fourthly, a terminal is provided, including a processor and a communication interface, wherein the processor is configured to determine the transmission power of repeated transmissions of the Physical Random Access Channel (PRACH) according to a target indication, wherein the target indication is used to indicate whether the transmission power of the PRACH transmissions in the repeated PRACH transmissions is the same; and the communication interface is configured to perform repeated PRACH transmissions according to the transmission power of the repeated PRACH transmissions.

[0013] Fifthly, a communication system is provided, comprising: a terminal and a network-side device, wherein the terminal can be used to perform the steps of the PRACH transmission method as described in the first aspect.

[0014] In a sixth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect.

[0015] In a seventh aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being used to run programs or instructions to implement the steps of the method described in the first aspect.

[0016] Eighthly, a computer program / program product is provided, the computer program / program product being stored in a storage medium, the computer program / program product being executed by at least one processor to perform the steps of the method as described in the first aspect.

[0017] In this embodiment, the terminal determines the transmission power of PRACH retransmissions based on a target indication, wherein the target indication is used to indicate whether the transmission power of PRACH retransmissions in PRACH retransmissions is the same; the terminal performs PRACH retransmissions based on the transmission power of the PRACH retransmissions. The terminal can determine whether the transmission power of PRACH retransmissions in PRACH retransmissions is the same based on the target indication, flexibly determining the transmission power of PRACH retransmissions in PRACH retransmissions and improving transmission performance. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a network system provided in an embodiment of this application;

[0019] Figure 2 This is a flowchart of the PRACH transmission method provided in the embodiments of this application;

[0020] Figure 3a One of the schematic diagrams of the power ramp-up counter counting method in PRACH repeated transmission provided in this application embodiment;

[0021] Figure 3b This application provides a second schematic diagram of the power ramp-up counter counting method in PRACH repeated transmissions;

[0022] Figure 4 This is a structural diagram of the PRACH transmission device provided in the embodiments of this application;

[0023] Figure 5 This is a structural diagram of the communication device provided in the embodiments of this application;

[0024] Figure 6 This is a structural diagram of the terminal provided in the embodiments of this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used in the systems and radio technologies mentioned above, as well as in other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and NR terminology is used in most of the following description; however, these technologies can also be applied to applications beyond NR systems, such as 6th Generation (6G) communication systems.

[0028] Figure 1This diagram illustrates a block diagram of a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. Terminal 11 can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), smart home (home devices with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM, or self-service machine, etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. It should be noted that the specific type of terminal 11 is not limited in this embodiment. Network-side equipment 12 may include access network equipment or core network equipment. Access network equipment 12 may also be referred to as radio access network equipment, radio access network (RAN), radio access network function, or radio access network unit. Access network equipment 12 may include base stations, WLAN access points, or WiFi nodes, etc. Base stations may be referred to as Node B, evolved Node B (eNB), access point, base transceiver station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), home B node, home evolved B node, Transmitting Receiving Point (TRP), or any other suitable term in the field, as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in this application embodiment, only a base station in an NR system is used as an example for description, and the specific type of base station is not limited.

[0029] The PRACH transmission method provided in this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0030] Please see Figure 2 , Figure 2 This is a flowchart of a PRACH transmission method provided in an embodiment of this application. The PRACH transmission method includes:

[0031] Step 201: The terminal determines the transmission power of the PRACH repeated transmission according to the target indication, wherein the target indication is used to indicate whether the transmission power of the PRACH transmission in the PRACH repeated transmission is the same.

[0032] The target indication includes at least one of the following: protocol-specified indication, network-side device indication, and Downlink Control Information (DCI) indication of the Physical Downlink Control Channel (PDCCH). For example, the protocol specifies that each (or every) PRACH transmission in the PRACH repetition has the same or different transmission power; or the network-side device indicates that each PRACH transmission in the PRACH repetition has the same or different transmission power; or the DCI of the PDCCH indicates that each PRACH transmission in the PRACH repetition has the same or different transmission power.

[0033] Step 202: The terminal performs PRACH retransmission according to the transmission power of the PRACH retransmission.

[0034] In this embodiment, the terminal determines the transmission power of PRACH retransmissions based on a target indication, wherein the target indication is used to indicate whether the transmission power of PRACH retransmissions in PRACH retransmissions is the same; the terminal performs PRACH retransmissions based on the transmission power of the PRACH retransmissions. The terminal can determine whether the transmission power of PRACH retransmissions is the same based on the target indication, flexibly determining the transmission power of PRACH retransmissions in PRACH retransmissions and improving transmission performance.

[0035] Optionally, the transmit power of the PRACH retransmission satisfies at least one of the following:

[0036] Each PRACH transmission in the repetitive PRACH transmission has the same transmission power;

[0037] PRACH transmissions that are associated with the same reference signal in the PRACH repetition transmissions have the same transmission power;

[0038] The PRACH repetition transmissions associated with different reference signals have different transmission powers.

[0039] In other words, a target indication can be used to indicate that each PRACH transmission in the PRACH repetition has the same transmission power. For example, to ensure that the network-side device can determine which PRACH transmission in the PRACH repetition has the best reception quality, regardless of whether the reference signal associated with each PRACH transmission is the same, it is required that each PRACH in the PRACH repetition has the same transmission power. Furthermore, this same transmission power can be determined using the path loss estimate obtained before the first PRACH transmission in the PRACH repetition; that is, the transmission power of each PRACH transmission is determined using this path loss estimate.

[0040] In the case where each PRACH transmission in the PRACH repetition is associated with a different reference signal, if each PRACH transmission in the PRACH repetition has the same transmit power, the network-side device can determine which reference signal is the best reference signal among the reference signals associated with each PRACH transmission by using the estimated receive power of each PRACH transmission.

[0041] Instructing network-side devices to use the same or different transmit power for each PRACH transmission in a PRACH repetition provides greater flexibility. For example, when a network-side device needs to determine which PRACH transmission has the optimal receive power, it can instruct the terminal to use the same path loss estimate for each PRACH transmission. The same path loss estimate corresponds to the same transmit power. With the transmit power of each PRACH transmission being the same, the network-side device can determine which PRACH transmission has the optimal receive power based on the receive power.

[0042] In the PRACH repetition transmission, each PRACH transmission has the same transmission power, or different transmission powers can also be indicated by the DCI of the PDCCH; or, in the case that each PRACH transmission has the same transmission power in the PRACH repetition transmission, the reference signal used to estimate the path loss is indicated by the DCI of the PDCCH.

[0043] In one embodiment of this application, determining the transmission power of the PRACH repetitive transmission through power ramping includes one of the following:

[0044] (1) Perform power ramping on the PRACH repetitive transmission to determine the transmission power of the PRACH repetitive transmission.

[0045] (2) Based on the network-side device configuration, perform the power ramp-up on the repeated PRACH transmissions to determine the transmission power of the repeated PRACH transmissions. For example, if the network-side device is configured with a power ramp-up step size, perform the power ramp-up on the repeated PRACH transmissions.

[0046] (3) Based on the network-side device's expected transmission power for the repeated PRACH transmissions, the power ramp-up is performed on the repeated PRACH transmissions to determine the transmission power of the repeated PRACH transmissions. For example, if the network-side device's expected transmission power for each PRACH transmission in the repeated PRACH transmissions is different, the power ramp-up is performed on the repeated PRACH transmissions. If the network-side device's expected transmission power for each PRACH transmission in the repeated PRACH transmissions is the same, the power ramp-up is not performed on the repeated PRACH transmissions.

[0047] In one embodiment of this application, when the terminal performs power ramping for the repeated PRACH transmission, if the next PRACH transmission of the current PRACH transmission meets a first preset condition, the power ramping counter used for the repeated PRACH transmission is paused.

[0048] The first preset condition includes at least one of the following:

[0049] (1) Compared with the current PRACH transmission, the spatial domain transmission filter of the next PRACH transmission changes;

[0050] like Figure 3aAs shown, the PRACH repetition transmission includes four PRACH transmissions: {Rep1, Rep2, Rep3, Rep4}. These four PRACH transmissions are associated with reference signals SSB1, SSB2, and SSB2, respectively. When power ramping is supported, power ramping is performed on Rep2, meaning the counter increments from 1 to 2 relative to Rep1 during Rep2 transmission. In other words, during Rep2 transmission, the transmission power is increased by the power ramp-up step size based on the power transmitted in Rep1. For Rep3, since Rep3 is associated with SSB2, and Rep2 is associated with SSB1, and the SSBs associated with Rep3 and Rep2 are different, power ramping is paused during Rep3 transmission, and the counter does not increment.

[0051] (2) The priority order of allocating power to uplink channels for the next PRACH transmission does not allow the power ramp-up counter for repeated PRACH transmissions to be incremented;

[0052] (3) In the operation of E-UTRA NR dual connectivity with MCG using E-UTRA and SCG using NR (EN-DC) or NR-NR Dual Connectivity (NR-DC) operation, the power ramp counter is not allowed to be increased. Here, E-UTRA is the abbreviation for Evolved UMTS Terrestrial Radio Access, UMTS is the abbreviation for Universal Mobile Telecommunications System, MCG is the abbreviation for Master cell group, and SCG is the abbreviation for Secondary cell group.

[0053] (4) The time slot format cannot be used for the next PRACH transmission;

[0054] (5) The next PRACH transmission is in the same time slot as other transmissions;

[0055] (6) If the gap between the next PRACH transmission and the other transmissions is less than a preset threshold, the next PRACH transmission is not transmitted. The preset threshold can be set according to the actual situation and is not limited here.

[0056] The other transmissions mentioned above include PUSCH transmission, PUCCH transmission, or SRS transmission.

[0057] In one embodiment of this application, when the terminal performs power ramp-up on the repeated PRACH transmission, if the next PRACH transmission of the current PRACH transmission meets a second preset condition, the power ramp-up counter increments. The second preset condition includes: the spatial transmission filter of the next PRACH transmission has not changed compared to the current PRACH transmission.

[0058] In one embodiment of this application, the power ramp-up counter used for the PRACH repeated transmission is the same as the power ramp-up counter used for PRACH retransmission. After each PRACH repeated transmission or each PRACH retransmission, the power continuously increases until the maximum allowed value is reached.

[0059] It should be noted that a PRACH initial transmission may include PRACH retransmissions, and a PRACH retransmission may also include PRACH retransmissions.

[0060] like Figure 3b As shown, Figure 3b In this configuration, the power ramping counter used for PRACH retransmissions is the same as that used for PRACH retransmissions. Each PRACH includes an initial transmission and one retransmission, with two retransmissions for each. In the initial transmission, the two retransmissions are associated with the same reference signal, SSB1, and the power ramping counter increases from 1 to 2. In the retransmission, Rep3 is associated with SSB2. SSB2 is different from the SSB1 associated with the last PRACH transmission Rep2 in the initial transmission, so the power ramping counter does not increase. For the second PRACH transmission Rep4 in the retransmission, since the reference signal associated with Rep4 is still SSB2, the same as the reference signal associated with Rep3, the power ramping counter further increases to 3.

[0061] In one embodiment of this application, the maximum number of PRACH transmissions is the sum of the maximum number of PRACH retransmissions included in the initial PRACH transmission and the maximum number of PRACH retransmissions included in all PRACH retransmissions. When the maximum number of PRACH transmissions is reached, a random access error is declared. The number of transmissions for random access by the terminal is the maximum number of PRACH transmissions.

[0062] In one embodiment of this application, if the power ramp counter used for the PRACH retransmission is the same as the power ramp counter used for the PRACH retransmission, the maximum number of PRACH transmissions is the sum of the maximum number of PRACH retransmissions included in the initial PRACH transmission and the maximum number of PRACH retransmissions included in all PRACH retransmissions.

[0063] Alternatively, a separate maximum number of transmissions can be configured for PRACH retransmissions. If PRACH retransmissions support power ramping, since retransmissions are already performed for each transmission and retransmission, a smaller maximum number of transmissions can be configured.

[0064] In this embodiment, each PRACH transmission in a PRACH repetition transmission can have the same transmission power or different transmission powers. For cases where different PRACH transmissions in a PRACH repetition transmission do not need to ensure the same power, power ramping based on PRACH repetition transmission is supported, which helps PRACH transmissions use higher power earlier, further reducing random access latency.

[0065] For power ramping that only supports PRACH retransmission and not PRACH retransmission, the maximum number of retransmissions can be reduced if PRACH retransmission has been performed in each retransmission compared to the case where PRACH retransmission has not been performed, so as to determine the end of the current random access process earlier.

[0066] This application Figure 2 The provided PRACH transmission method can be executed by a PRACH transmission device 400. This embodiment uses the PRACH transmission device 400 executing the PRACH transmission method as an example to illustrate the apparatus for the PRACH transmission method provided in this embodiment. Figure 4 As shown, this application embodiment provides a PRACH transmission device 400, including:

[0067] The determining module 401 is used to determine the transmission power of repeated transmissions of the Physical Random Access Channel (PRACH) based on the target indication, wherein the target indication is used to indicate whether the transmission power of the PRACH transmissions in the repeated PRACH transmissions is the same;

[0068] The transmission module 402 is used to perform PRACH repetitive transmission according to the transmission power of the PRACH repetitive transmission.

[0069] Furthermore, the transmit power of the PRACH repetitive transmission satisfies at least one of the following:

[0070] Each PRACH transmission in the repetitive PRACH transmission has the same transmission power;

[0071] PRACH transmissions that are associated with the same reference signal in the PRACH repetition transmissions have the same transmission power;

[0072] The PRACH repetition transmissions associated with different reference signals have different transmission powers.

[0073] Furthermore, in the case that each PRACH transmission has the same transmission power in the PRACH repetition transmission, the reference signal used to estimate the path loss is indicated by the downlink control information (DCI) of the PDCCH.

[0074] Furthermore, the target indication includes at least one of the following:

[0075] The agreement stipulates the following instructions:

[0076] Network-side device indication;

[0077] PDCCH's DCI indication.

[0078] Furthermore, the determining module 401 is also used to determine the transmission power of the PRACH repeated transmission through the power ramp-up.

[0079] Further, module 401 is determined to include one of the following:

[0080] The first determining submodule is used to perform power ramping on the PRACH repeated transmission in order to determine the transmission power of the PRACH repeated transmission;

[0081] The second determining submodule is used to perform the power ramp-up on the PRACH repeated transmission according to the network-side device configuration, so as to determine the transmission power of the PRACH repeated transmission;

[0082] The third determining submodule is used to perform the power ramp-up on the PRACH repeated transmission based on the network-side device's expected transmission power for the PRACH repeated transmission, so as to determine the transmission power of the PRACH repeated transmission.

[0083] Furthermore, the second determining submodule is used to perform the power ramp-up on the PRACH retransmission when the network-side device is configured with a power ramp-up step size.

[0084] Furthermore, the third determining submodule is used to perform the power ramp-up for the repeated PRACH transmissions when the expected transmission power of each PRACH transmission in the repeated PRACH transmissions by the network-side device is different.

[0085] Furthermore, when the terminal performs power ramp-up on the repeated PRACH transmission, if the next PRACH transmission of the current PRACH transmission meets the first preset condition, the power ramp-up counter used for the repeated PRACH transmission will pause counting.

[0086] Furthermore, the first preset condition includes at least one of the following:

[0087] Compared to the current PRACH transmission, the spatial transmission filter of the next PRACH transmission changes;

[0088] The order of uplink channel power allocation priority referenced by the next PRACH transmission does not allow the power ramp-up counter to increase;

[0089] In EN-DC or NR-DC operation, power distribution does not allow the power ramp-up counter to increment;

[0090] The time slot format cannot be used for the next PRACH transmission;

[0091] The next PRACH transmission is in the same time slot as other transmissions;

[0092] If the gap between the next PRACH transmission and the other transmissions is less than a preset threshold, the next PRACH transmission is not transmitted.

[0093] Furthermore, the other transmissions include PUSCH transmission, PUCCH transmission, or SRS transmission.

[0094] Furthermore, when the terminal performs power ramp-up on the repeated PRACH transmission, if the next PRACH transmission of the current PRACH transmission meets the second preset condition, the power ramp-up counter increments.

[0095] Furthermore, the second preset condition includes: the spatial transmission filter of the next PRACH transmission has not changed compared to the current PRACH transmission.

[0096] Furthermore, the power ramp counter used for the PRACH retransmission is the same as the power ramp counter used for PRACH retransmission.

[0097] Furthermore, the maximum number of PRACH transmissions is the sum of the maximum number of PRACH retransmissions included in the initial PRACH transmission and the maximum number of PRACH retransmissions included in all PRACH retransmissions.

[0098] Furthermore, the number of random access transmissions of the terminal is the maximum number of PRACH transmissions.

[0099] The PRACH transmission device 400 in this embodiment can be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices besides a terminal. For example, the terminal can include, but is not limited to, the type of terminal 11 listed above; other devices can be servers, network attached storage (NAS), etc., and this embodiment does not impose specific limitations.

[0100] The PRACH transmission device 400 provided in this embodiment can achieve Figure 2 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0101] Optional, such as Figure 5 As shown, this application embodiment also provides a communication device 500, including a processor 501 and a memory 502. The memory 502 stores a program or instructions that can run on the processor 501. For example, when the communication device 500 is a terminal, the program or instructions executed by the processor 501 implement the above-mentioned... Figure 2 The steps of the PRACH transmission method embodiment shown are the same and can achieve the same technical effect, so they will not be repeated here.

[0102] This application embodiment also provides a terminal, including a processor and a communication interface, wherein the processor is used to determine the transmission power of repeated transmissions of the Physical Random Access Channel (PRACH) according to a target indication, wherein the target indication is used to indicate whether the transmission power of PRACH transmissions in repeated PRACH transmissions is the same; the communication interface is used to perform repeated PRACH transmissions according to the transmission power of the repeated PRACH transmissions. This terminal embodiment corresponds to the above-described terminal-side method embodiment, and all implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, Figure 6 A schematic diagram of the hardware structure of a terminal to implement an embodiment of this application.

[0103] The terminal 600 includes, but is not limited to, at least some of the following components: radio frequency unit 601, network module 602, audio output unit 603, input unit 604, sensor 605, display unit 606, user input unit 607, interface unit 608, memory 609, and processor 610.

[0104] Those skilled in the art will understand that the terminal 600 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 610 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 6 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0105] It should be understood that, in this embodiment, the input unit 604 may include a graphics processing unit (GPU) 6041 and a microphone 6042. The GPU 6041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 606 may include a display panel 6061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 607 includes at least one of a touch panel 6071 and other input devices 6072. The touch panel 6071 is also called a touch screen. The touch panel 6071 may include a touch detection device and a touch controller. Other input devices 6072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0106] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 601 can transmit it to the processor 610 for processing; in addition, the radio frequency unit 601 can send uplink data to the network-side device. Typically, the radio frequency unit 601 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0107] The memory 609 can be used to store software programs or instructions, as well as various data. The memory 609 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 609 may include volatile memory or non-volatile memory, or both. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 609 in this embodiment includes, but is not limited to, these and any other suitable types of memory.

[0108] Processor 610 may include one or more processing units; optionally, processor 610 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 610.

[0109] The processor 610 is configured to determine the transmission power of repeated transmissions of the Physical Random Access Channel (PRACH) based on a target indication, wherein the target indication is used to indicate whether the transmission power of the PRACH transmissions in the repeated PRACH transmissions is the same.

[0110] Radio frequency unit 601 is used to perform PRACH repetitive transmission according to the transmit power of the PRACH repetitive transmission.

[0111] Furthermore, the transmit power of the PRACH repetitive transmission satisfies at least one of the following:

[0112] Each PRACH transmission in the repetitive PRACH transmission has the same transmission power;

[0113] PRACH transmissions that are associated with the same reference signal in the PRACH repetition transmissions have the same transmission power;

[0114] The PRACH repetition transmissions associated with different reference signals have different transmission powers.

[0115] Furthermore, in the case that each PRACH transmission has the same transmission power in the PRACH repetition transmission, the reference signal used to estimate the path loss is indicated by the downlink control information (DCI) of the PDCCH.

[0116] Furthermore, the target indication includes at least one of the following:

[0117] The agreement stipulates the following instructions:

[0118] Network-side device indication;

[0119] PDCCH's DCI indication.

[0120] Furthermore, the processor 610 is also configured to determine the transmission power of the PRACH repetitive transmission based on the power ramp-up.

[0121] Furthermore, the processor 610 is also used to perform one of the following:

[0122] Perform power ramp-up on the repeated PRACH transmissions;

[0123] According to the network-side device configuration, the power ramp-up is performed on the repeated PRACH transmissions;

[0124] The power ramp-up is performed on the repeated PRACH transmissions based on the network-side device's expected transmission power.

[0125] Furthermore, the processor 610 is also configured to perform the power ramp-up on the PRACH retransmission when the network-side device is configured with a power ramp-up step size.

[0126] Furthermore, the processor 610 is also configured to perform the power ramp-up on the repeated PRACH transmissions when the expected transmission power of each PRACH transmission in the repeated PRACH transmissions by the network-side device is different.

[0127] Furthermore, when the terminal performs power ramp-up on the repeated PRACH transmission, if the next PRACH transmission of the current PRACH transmission meets the first preset condition, the power ramp-up counter used for the repeated PRACH transmission will pause counting.

[0128] Furthermore, the first preset condition includes at least one of the following:

[0129] Compared to the current PRACH transmission, the spatial transmission filter of the next PRACH transmission changes;

[0130] The order of uplink channel power allocation priority referenced by the next PRACH transmission does not allow the power ramp-up counter to increase;

[0131] In EN-DC or NR-DC operation, power distribution does not allow the power ramp-up counter to increment;

[0132] The time slot format cannot be used for the next PRACH transmission;

[0133] The next PRACH transmission is in the same time slot as other transmissions;

[0134] If the gap between the next PRACH transmission and the other transmissions is less than a preset threshold, the next PRACH transmission is not transmitted.

[0135] Furthermore, the other transmissions include PUSCH transmission, PUCCH transmission, or SRS transmission.

[0136] Furthermore, when the terminal performs power ramp-up on the repeated PRACH transmission, if the next PRACH transmission of the current PRACH transmission meets the second preset condition, the power ramp-up counter increments.

[0137] Furthermore, the second preset condition includes: the spatial transmission filter of the next PRACH transmission has not changed compared to the current PRACH transmission.

[0138] Furthermore, the power ramp counter used for the PRACH retransmission is the same as the power ramp counter used for PRACH retransmission.

[0139] Furthermore, the maximum number of PRACH transmissions is the sum of the maximum number of PRACH retransmissions included in the initial PRACH transmission and the maximum number of PRACH retransmissions included in all PRACH retransmissions.

[0140] Furthermore, the number of random access transmissions of the terminal is the maximum number of PRACH transmissions.

[0141] The terminal provided in this application embodiment can achieve... Figure 2 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0142] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described PRACH transmission method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0143] The processor is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0144] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described PRACH transmission method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0145] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0146] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described PRACH transmission method embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0147] This application also provides a communication system, including: a terminal and a network-side device, wherein the terminal can be used to perform the above-described actions. Figure 2 The steps of the method embodiment shown.

[0148] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0149] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network-side device, etc.) to execute the methods described in the various embodiments of this application.

[0150] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A PRACH transmission method, characterized in that, include: The terminal determines the transmission power of repeated transmissions of the Physical Random Access Channel (PRACH) based on the target indication, wherein the target indication is used to indicate whether the transmission power of PRACH transmissions in repeated PRACH transmissions is the same; The terminal performs PRACH retransmission based on the transmission power of the PRACH retransmission; When the terminal performs power ramp-up on the repeated PRACH transmission, if the next PRACH transmission of the current PRACH transmission meets a first preset condition, the power ramp-up counter for the repeated PRACH transmission is paused, wherein the first preset condition includes at least one of the following: The order of uplink channel power allocation priority referenced by the next PRACH transmission does not allow the power ramp-up counter to increase; The time slot format cannot be used for the next PRACH transmission; The next PRACH transmission is in the same time slot as other transmissions; If the gap between the next PRACH transmission and other transmissions is less than a preset threshold, the next PRACH transmission is not transmitted.

2. The method according to claim 1, characterized in that, The transmit power of the PRACH repeated transmission satisfies at least one of the following: Each PRACH transmission in the repetitive PRACH transmission has the same transmission power; PRACH transmissions that are associated with the same reference signal in the PRACH repetition transmissions have the same transmission power; The PRACH repetition transmissions associated with different reference signals have different transmission powers.

3. The method according to claim 2, characterized in that, In the case that each PRACH transmission has the same transmission power in the PRACH repetition transmission, the reference signal used to estimate the path loss is indicated by the downlink control information (DCI) of the PDCCH.

4. The method according to claim 1, characterized in that, The determination of the transmit power for repeated transmissions of the Physical Random Access Channel (PRACH) includes: The transmission power of the PRACH repeated transmission is determined by the power ramp-up.

5. The method according to claim 4, characterized in that, The determination of the transmit power for repeated PRACH transmissions through the power ramp-up includes one of the following: A power ramp-up is performed on the PRACH repetitive transmission to determine the transmission power of the PRACH repetitive transmission; According to the network-side device configuration, the power ramp-up is performed on the PRACH repeated transmission to determine the transmission power of the PRACH repeated transmission; Based on the network-side device's expected transmission power for the PRACH repetition transmission, the power ramp-up is performed on the PRACH repetition transmission to determine the transmission power of the PRACH repetition transmission.

6. The method according to claim 5, characterized in that, The step of performing power ramping on the PRACH repetitive transmissions according to the network-side device configuration to determine the transmission power of the PRACH repetitive transmissions includes: When the network-side device is configured with a power ramp-up step size, the power ramp-up is performed on the repeated PRACH transmissions to determine the transmission power of the repeated PRACH transmissions.

7. The method according to claim 5, characterized in that, The step of performing power ramping on the PRACH repetition transmission based on the network-side device's expected transmission power for the PRACH repetition transmission, in order to determine the transmission power of the PRACH repetition transmission, includes: When the network-side device has different expected transmission power for each PRACH transmission in the PRACH repetition transmission, the power ramp-up is performed on the PRACH repetition transmission to determine the transmission power of the PRACH repetition transmission.

8. The method according to claim 1, characterized in that, The first preset condition also includes at least one of the following: Compared to the current PRACH transmission, the spatial transmission filter of the next PRACH transmission changes; In EN-DC or NR-DC operation, power distribution does not allow the power ramp-up counter to increment.

9. The method according to claim 1, characterized in that, The other transmissions include PUSCH transmission, PUCCH transmission, or SRS transmission.

10. The method according to claim 1, characterized in that, When the terminal performs power ramp-up on the repeated PRACH transmission, if the next PRACH transmission of the current PRACH transmission meets the second preset condition, the power ramp-up counter increments.

11. The method according to claim 10, characterized in that, The second preset condition includes: the spatial transmission filter of the next PRACH transmission has not changed compared to the current PRACH transmission.

12. The method according to claim 1, characterized in that, The power ramp counter used for the PRACH retransmission is the same as the power ramp counter used for PRACH retransmission.

13. The method according to claim 1, characterized in that, The maximum number of PRACH transmissions is the sum of the maximum number of PRACH retransmissions included in the initial PRACH transmission and the maximum number of PRACH retransmissions included in all PRACH retransmissions.

14. The method according to claim 13, characterized in that, The number of random access transmissions of the terminal is the maximum number of PRACH transmissions.

15. A PRACH transmission device, applied to a terminal, characterized in that, include: The determination module is used to determine the transmission power of repeated transmissions of the Physical Random Access Channel (PRACH) based on a target indication, wherein the target indication is used to indicate whether the transmission power of the PRACH transmissions in the repeated PRACH transmissions is the same; The transmission module is used to perform PRACH repetitive transmission according to the transmission power of the PRACH repetitive transmission; When the terminal performs power ramp-up on the repeated PRACH transmission, if the next PRACH transmission of the current PRACH transmission meets a first preset condition, the power ramp-up counter for the repeated PRACH transmission is paused, wherein the first preset condition includes at least one of the following: The order of uplink channel power allocation priority referenced by the next PRACH transmission does not allow the power ramp-up counter to increase; The time slot format cannot be used for the next PRACH transmission; The next PRACH transmission is in the same time slot as other transmissions; If the gap between the next PRACH transmission and other transmissions is less than a preset threshold, the next PRACH transmission is not transmitted.

16. The apparatus according to claim 15, characterized in that, The transmit power of the PRACH repeated transmission satisfies at least one of the following: Each PRACH transmission in the repetitive PRACH transmission has the same transmission power; PRACH transmissions that are associated with the same reference signal in the PRACH repetition transmissions have the same transmission power; The PRACH repetition transmissions associated with different reference signals have different transmission powers.

17. The apparatus according to claim 16, characterized in that, In the case that each PRACH transmission has the same transmission power in the PRACH repetition transmission, the reference signal used to estimate the path loss is indicated by the downlink control information (DCI) of the PDCCH.

18. A terminal, characterized in that, It includes a processor and a memory, the memory storing a program or instructions that can run on the processor, the program or instructions being executed by the processor to implement the steps of the PRACH transmission method as described in any one of claims 1 to 14.

19. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the PRACH transmission method as described in any one of claims 1-14.

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