PRACH (Physical Random Access Channel) repeated transmission method and user equipment

Abstract

The invention provides a PRACH (Physical Random Access Channel) repeated transmission method and user equipment, and relates to the field of wireless communication. The user equipment calculates a first power difference value between a first power value and a second power value, the first power value being the maximum output power of the user equipment, and the second power value being determined according to a PRACH target receiving power and a path loss value; determining the number of times of first PRACH repeated transmission according to the network side configuration and the current first reference signal receiving power; comparing a first numerical value with the first power difference value, wherein the first numerical value is a repeated transmission gain determined according to the number of times of repeated transmission of the first PRACH; and according to a comparison result, determining whether to perform PRACH repeated transmission by adopting the first PRACH repeated transmission times. Therefore, the success rate of PRACH transmission is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communications, and in particular to a PRACH (Physical Random Access Channel) repeated transmission method and user equipment. Background Art

[0002] The user equipment (UE) sends a preamble once at a PRACH transmission opportunity indicated by the base station. The UE can calculate the corresponding RA-RNTI (Random Access Radio Network Temporary Identifier) ​​value based on the time-frequency position of the PRACH transmission opportunity. Then, the UE monitors the PDCCH (Physical Downlink Control Channel) in the random access response (RAR) time window. If the UE successfully descrambles and detects the DCI (Downlink Control Information) 1_0 with the RA-RNTI, and can identify the RAPID (Random Access Preamble identifier) ​​in the random access response information scheduled by the DCI, the UE considers that its PRACH transmission is successful. Otherwise, the UE considers that the PRACH transmission is unsuccessful and needs to retransmit a new PRACH, which will bring additional delay. Summary of the invention

[0003] In an embodiment of the present disclosure, a user equipment calculates a first power difference between a first power value and a second power value, wherein the first power value is the maximum output power of the user equipment, and the second power value is determined according to the PRACH target receiving power and the path loss value; determines the first PRACH repetition transmission times according to the network side configuration and the current first reference signal receiving power; compares the first value with the first power difference, wherein the first value is the repetition transmission gain determined according to the first PRACH repetition transmission times; and determines whether to use the first PRACH repetition transmission times for PRACH repetition transmission according to the comparison result. Thus, the success rate of PRACH transmission is improved and the transmission delay is reduced. In addition, according to the first power value, the second power value, and the first value, the transmission power of each PRACH transmission opportunity of PRACH repetition transmission is reasonably determined to further improve the success rate of PRACH repetition transmission.

[0004] Some embodiments of the present disclosure provide a method for repeated PRACH transmission, which is performed by a user equipment and includes:

[0005] Calculate a first power difference between a first power value and a second power value, wherein the first power value is a maximum output power of the user equipment, and the second power value is determined according to a PRACH target received power and a path loss value;

[0006] Determine the number of first PRACH repetition transmissions according to the network side configuration and the current first reference signal received power;

[0007] comparing a first value with the first power difference, the first value being a repetition transmission gain determined according to the number of repetition transmissions of the first PRACH;

[0008] According to the comparison result, it is determined whether to use the first PRACH repetition transmission number to perform PRACH repetition transmission.

[0009] In some embodiments, it also includes: when using the first PRACH repetition transmission number for PRACH repetition transmission, updating the transmission power of each PRACH transmission opportunity to a fourth power value, and the fourth power value is determined based on the first power value, the second power value, and the first value.

[0010] In some embodiments, the fourth power value is a minimum value of the first power value and a first value to be compared, and the first value to be compared is a difference between the second power value and the first value.

[0011] In some embodiments, the fourth power value is the minimum value of the first power value and the second value to be compared, the second value to be compared is the sum of the first value to be compared and the power compensation value configured on the network side, and the first value to be compared is the difference between the second power value and the first value.

[0012] In some embodiments, it also includes: when it is determined according to the comparison result to adopt PRACH single transmission, updating the PRACH transmission power to a third power value, wherein the third power value is determined according to the first power value, the second power value, and the PRACH power climbing value.

[0013] In some embodiments, the third power value is the minimum value of the first power value and a third value to be compared, and the third value to be compared is the sum of the second power value and the PRACH power climbing value.

[0014] In some embodiments, the PRACH power climbing value is determined based on the product of a second value and ratio information, where the second value is the PRACH power climbing step configured on the network side, and the ratio information is determined based on the ratio of the first value to the second value.

[0015] In some embodiments, the ratio information is a result obtained by rounding up, rounding down, or rounding off the ratio of the first value to the second value.

[0016] In some embodiments, it also includes:

[0017] In the case where a single PRACH transmission is unsuccessful, determining the number of second PRACH repetition transmissions according to the network side configuration and the current second reference signal received power;

[0018] The second PRACH repetition transmission number is used for PRACH repetition transmission, and the transmission power of each PRACH transmission opportunity is updated to a fifth power value, wherein the fifth power value is determined according to the first power value, the third power value, and a third numerical value, and the third numerical value is a repetition transmission gain determined according to the second PRACH repetition transmission number.

[0019] In some embodiments, the fifth power value is the minimum value of the first power value and the fourth value to be compared, the fourth value to be compared is the third power value plus the second value minus the third value, and the second value is the PRACH power climbing step configured on the network side.

[0020] In some embodiments, the fifth power value is the minimum value of the first power value and the fifth value to be compared, and the fifth value to be compared is a value obtained by subtracting the third value from the third power value.

[0021] In some embodiments, determining the second PRACH repetition transmission number based on the network side configuration and the current second reference signal reception power includes: determining the second PRACH repetition transmission number by comparing the second reference signal reception power with at least one reference signal reception power threshold in the network side configuration.

[0022] In some embodiments, the third value is a repetition transmission gain determined based on a logarithmic operation result of the number of repetition transmissions of the second PRACH.

[0023] In some embodiments, the first value is a repetition transmission gain determined based on a logarithmic operation result of the first PRACH repetition transmission number.

[0024] In some embodiments, determining the first PRACH repetition transmission number based on the network side configuration and the current first reference signal reception power includes: determining the first PRACH repetition transmission number by comparing the first reference signal reception power with at least one reference signal reception power threshold in the network side configuration.

[0025] In some embodiments, based on the comparison result, determining whether to use the first number of PRACH repeated transmissions for PRACH repeated transmission includes: when the first numerical value is greater than the first power difference value, determining to use the first number of PRACH repeated transmissions for PRACH repeated transmission; or, when the first numerical value is not greater than the first power difference value, determining to use PRACH single transmission.

[0026] In some embodiments, the second power value is the sum of the PRACH target received power and the path loss value.

[0027] Some embodiments of the present disclosure provide a user equipment, including: a module for executing a method for repeated PRACH transmission.

[0028] Some embodiments of the present disclosure provide a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the steps of the PRACH repeated transmission method when the program is executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. The present disclosure can be more clearly understood according to the following detailed description with reference to the drawings.

[0030] Obviously, the drawings described below are only some embodiments of the present disclosure, and a person skilled in the art can obtain other drawings based on these drawings without creative work.

[0031] Figure 1 A flowchart illustrating a method for repeated PRACH transmission according to some embodiments of the present disclosure is shown.

[0032] Figure 2 A schematic diagram showing the structure of a user equipment according to some embodiments of the present disclosure is shown.

[0033] Figure 3 A schematic diagram showing the structure of a user equipment according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure.

[0035] Unless otherwise specified, descriptions such as "first", "second", "third", "fourth", etc. in the present disclosure are used to distinguish different objects and are not used to indicate meanings such as size or time sequence.

[0036] It should also be understood that in the embodiments of the present disclosure, “plurality” may refer to two or more than two, and “at least one” may refer to one, two, or more than two.

[0037] It should also be understood that any component, data or structure mentioned in the embodiments of the present disclosure can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0038] It should also be understood that the description of the various embodiments in the present disclosure focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0039] The following describes the difference between PRACH retransmission and PRACH repetition or multiple transmissions. PRACH retransmission refers to a new PRACH transmission process that is re-initiated after a PRACH transmission process fails, where a PRACH transmission process includes a single PRACH transmission or a PRACH repetition. PRACH repetition refers to multiple PRACH transmissions on multiple PRACH transmission occasions in a PRACH transmission process, where the number of multiple PRACH transmission occasions is equal to the number of PRACH repetitions.

[0040] Figure 1 A flowchart illustrating a method for repeated PRACH transmission according to some embodiments of the present disclosure is shown.

[0041] like Figure 1 As shown, the PRACH repeated transmission method of this embodiment includes: steps S1-S3a, and according to business requirements, may also include step S3b or step S3c or step S4.

[0042] In step S1, the user equipment calculates a first power difference.

[0043] 1-1) The first power difference is the difference between the first power value and the second power value.

[0044] 1-1-1) The first power value is the maximum output power of the user equipment, denoted by P CMAX .

[0045] 1-1-2) The second power value is the minimum power that the user equipment should transmit, and can be determined according to the PRACH target received power and the path loss value. For example, the second power value is the sum of the PRACH target received power (denoted as P PRACH,target ) and the path loss value (denoted as PL), denoted as P PRACH,target +PL.

[0046] In step S2, the user equipment determines the first PRACH retransmission count according to the network side configuration.

[0047] A method for determining the first PRACH retransmission count is as follows: The user equipment determines the first PRACH retransmission count according to the network side configuration and the current first reference signal received power (Reference Signal Received Power, RSRP). Specifically, by comparing the magnitude relationship between the first reference signal received power and at least one reference signal received power threshold in the network side configuration, the first PRACH retransmission count is determined. The at least one reference signal received power threshold divides the reference signal received power into several intervals; the first reference signal received powers in the same interval have the same first PRACH retransmission count; the first reference signal received powers in different intervals have different first PRACH retransmission counts. Suppose there is a first reference signal received power 1 in interval 1 and a first reference signal received power 2 in interval 2. If the power range of interval 1 is less than the power range of interval 2, the first PRACH retransmission count 1 corresponding to the first reference signal received power 1 is greater than the first PRACH retransmission count 2 corresponding to the first reference signal received power 2. The reference signals include at least one of the following downlink reference signals: synchronization signal block (SSB, Synchronization Signal Block), other broadcast signals except SSB, channel state information reference signal (CSI-RS, Channel State Information Reference Signal).

[0048] For example: The network side configures 2 RSRP thresholds, RSRP1 and RSRP2, where RSRP2 > RSRP1. At the same time, the network side configures 2 types of PRACH retransmission counts a and b, where a < b. The first RSRP value measured by the user equipment is P. When P ≤ RSRP1, the first PRACH retransmission count is b; when RSRP1 < P ≤ RSRP2, the first PRACH retransmission count is a.

[0049] In step S3a, the user equipment compares the first value with the first power difference, and determines whether to use the first PRACH repetition transmission number for PRACH repetition transmission according to the comparison result, see steps S3b and S3c for details.

[0050] 3-1) The first value is a repetition transmission gain determined according to the number of repetition transmissions of the first PRACH.

[0051] 3-1-1) The first value is a repetition transmission gain determined according to a logarithmic operation result of the first PRACH repetition transmission number. The first value is, for example, equal to 10×log10 (first PRACH repetition transmission number).

[0052] In step S3b, when the first value is less than or equal to the first power difference, the user equipment ignores the first PRACH repetition transmission times, performs only a single PRACH transmission, and updates the PRACH transmission power to a third power value.

[0053] 3-2) The third power value is determined based on the first power value, the second power value, and the PRACH power climbing value configured on the network side.

[0054] 3-2-1) The third power value is the minimum value of the first power value and the third value to be compared, and the third value to be compared is the sum of the second power value and the PRACH power climbing value.

[0055] 3-2-1-1) The PRACH power climbing value is determined according to the product of a second value and ratio information, where the second value is a PRACH power climbing step configured on the network side, and the ratio information is determined according to a ratio of the first value to the second value. The ratio information is a result obtained by rounding up, rounding down, or rounding off the ratio of the first value to the second value.

[0056] The third power value can be expressed by the formula: min(P CMAX ,P PRACH,target +PL+Δ), where or Or Δ=round(first value / second value)×second value, where is the round-up symbol, is the floor symbol, and “round()” is the rounding symbol.

[0057] In step S3c, when the first value is greater than the first power difference, the user equipment performs PRACH repetition transmission using the first PRACH repetition transmission number, and updates the transmission power of each PRACH transmission opportunity to a fourth power value.

[0058] 3-3) The fourth power value is determined based on the first power value, the second power value, and the first numerical value.

[0059] 3-3-1) The fourth power value is the minimum value of the first power value and the first value to be compared, and the first value to be compared is the difference between the second power value and the first value. The fourth power value can be expressed by the formula: min(P CMAX ,P PRACH,target +PL-10×log10(number of first PRACH repetition transmissions)0, min means taking the minimum value.

[0060] 3-3-2) The fourth power value is the minimum value of the first power value and the second value to be compared, the second value to be compared is the sum of the first value to be compared and the power compensation value configured on the network side, and the first value to be compared is the difference between the second power value and the first value. The fourth power value can be expressed as: min(P CMAX ,P PRACH,target +PL-10×log10(number of first PRACH repetition transmissions)+Δ o1f2et ), where Δ off2et Indicates the power compensation value configured on the network side.

[0061] In step S4, when the single PRACH transmission is unsuccessful, the user equipment re-determines the first PRACH repetition transmission number according to the network side configuration. For the sake of distinction, the step of "re-determining the first PRACH repetition transmission number" is named as the step of "determining the second PRACH repetition transmission number". The second PRACH repetition transmission number is used for PRACH repetition transmission, and the transmission power of each PRACH transmission opportunity is updated to the fifth power value.

[0062] 4-1) The fifth power value is determined based on the first power value, the third power value, and a third numerical value, wherein the third numerical value is a repetition transmission gain determined based on the number of repetition transmissions of the second PRACH.

[0063] The third value is a repetition transmission gain determined according to the logarithmic operation result of the second PRACH repetition transmission number. The third value can be expressed as: 10×log10(second PRACH repetition transmission number)

[0064] 4-1-1) The fifth power value is the minimum value of the first power value and the fourth value to be compared, the fourth value to be compared is the value obtained by adding the third power value to the second value and subtracting the third value, and the second value is the PRACH power climbing step configured on the network side.

[0065] The fifth power value can be expressed as: min(P CMAX , the third power value + the second value - 10×log10 (the second PRACH repetition transmission number)).

[0066] 4-1-2) The fifth power value is the minimum value of the first power value and the fifth value to be compared, and the fifth value to be compared is the value obtained by subtracting the third value from the third power value.

[0067] The fifth power value can be expressed as: min(P CMAX , the third power value -10×log10(the second PRACH repeated transmission times)).

[0068] 4-2) The user equipment determines the second PRACH repetition transmission number according to the network side configuration and the current second reference signal receiving power. Specifically, the second PRACH repetition transmission number is determined by comparing the size relationship between the second reference signal receiving power and at least one reference signal receiving power threshold in the network side configuration. The method for determining the second PRACH repetition transmission number can refer to the aforementioned method for determining the first PRACH repetition transmission number, which will not be repeated here. The reference signal includes at least one of the following downlink reference signals: synchronization signal block (SSB, Synchronization SignalBlock), other broadcast signals except SSB, channel state information reference signal (CSI-RS, Channel StateInformation Reference Signal).

[0069] If the second reference signal received power is the same as the first reference signal received power, then the determined second PRACH repetition transmission number is also the same as the first PRACH repetition transmission number.

[0070] In an embodiment of the present disclosure, a user equipment calculates a first power difference between a first power value and a second power value, wherein the first power value is the maximum output power of the user equipment, and the second power value is determined according to the PRACH target receiving power and the path loss value; determines the first PRACH repetition transmission times according to the network side configuration and the current first reference signal receiving power; compares the first value with the first power difference, wherein the first value is the repetition transmission gain determined according to the first PRACH repetition transmission times; and determines whether to use the first PRACH repetition transmission times for PRACH repetition transmission according to the comparison result. Thus, the success rate of PRACH transmission is improved. In addition, according to the first power value, the second power value, and the first value, the transmission power of each PRACH transmission opportunity of PRACH repetition transmission is reasonably determined, thereby further improving the success rate of PRACH repetition transmission.

[0071] Figure 2 A schematic diagram showing the structure of a user equipment according to some embodiments of the present disclosure is shown.

[0072] like Figure 2 As shown, the user equipment 200 of this embodiment includes: a module for executing the PRACH repeated transmission method.

[0073] The power difference calculation module 210 is configured to calculate a first power difference between a first power value and a second power value, wherein the first power value is the maximum output power of the user equipment, and the second power value is determined according to the PRACH target received power and the path loss value; the second power value is the sum of the PRACH target received power and the path loss value.

[0074] The repetition transmission number determination module 220 is configured to determine the first PRACH repetition transmission number according to the network side configuration and the current first reference signal received power.

[0075] The comparison module 230 is configured to compare a first value with the first power difference, where the first value is a repetition transmission gain determined according to the first PRACH repetition transmission number.

[0076] The transmission determination module 240 is configured to determine whether to use the first PRACH repetition transmission number for PRACH repetition transmission according to the comparison result. When the first value is greater than the first power difference, determine to use the first PRACH repetition transmission number for PRACH repetition transmission; or, when the first value is not greater than the first power difference, determine to use PRACH single transmission.

[0077] The user equipment 200 also includes: a first repeated transmission module 250, which is configured to update the transmission power of each PRACH transmission opportunity to a fourth power value when performing PRACH repeated transmission using the first PRACH repeated transmission number, and the fourth power value is determined based on the first power value, the second power value, and the first value.

[0078] The fourth power value is the minimum value of the first power value and the first value to be compared, and the first value to be compared is the difference between the second power value and the first value.

[0079] The fourth power value is the minimum value of the first power value and the second value to be compared, the second value to be compared is the sum of the first value to be compared and the power compensation value configured on the network side, and the first value to be compared is the difference between the second power value and the first value.

[0080] The user equipment 200 also includes: a single transmission module 260, which is configured to update the PRACH transmission power to a third power value when it is determined to adopt PRACH single transmission according to the comparison result, and the third power value is determined according to the first power value, the second power value, and the PRACH power climbing value.

[0081] The third power value is the minimum value of the first power value and the third value to be compared, and the third value to be compared is the sum of the second power value and the PRACH power climbing value.

[0082] The PRACH power climbing value is determined according to the product of a second value and ratio information, the second value is the PRACH power climbing step configured on the network side, and the ratio information is determined according to the ratio of the first value to the second value.

[0083] The ratio information is a result obtained by rounding up, rounding down, or rounding off the ratio of the first value to the second value.

[0084] The user equipment 200 also includes: a second repeated transmission module 270, which is configured to determine the second PRACH repeated transmission number according to the network side configuration and the current second reference signal receiving power when the PRACH single transmission is unsuccessful; use the second PRACH repeated transmission number to perform PRACH repeated transmission, and update the transmission power of each PRACH transmission opportunity to a fifth power value, wherein the fifth power value is determined according to the first power value, the third power value, and a third value, and the third value is a repeated transmission gain determined according to the second PRACH repeated transmission number.

[0085] The fifth power value is the minimum value of the first power value and the fourth value to be compared, the fourth value to be compared is the value obtained by adding the second value to the third power value and subtracting the third value, and the second value is the PRACH power climbing step configured on the network side.

[0086] The fifth power value is the minimum value of the first power value and the fifth value to be compared, and the fifth value to be compared is a value obtained by subtracting the third value from the third power value.

[0087] Determining the second PRACH repetition transmission number according to the network side configuration and the current second reference signal reception power includes: determining the second PRACH repetition transmission number by comparing the second reference signal reception power with at least one reference signal reception power threshold in the network side configuration.

[0088] The third value is a repetition transmission gain determined according to a logarithmic operation result of the number of repetition transmissions of the second PRACH.

[0089] The first value is a repetition transmission gain determined according to a logarithmic operation result of the number of repetition transmissions of the first PRACH.

[0090] The repetition transmission number determination module 220 is configured to determine the first PRACH repetition transmission number by comparing the first reference signal received power with at least one reference signal received power threshold in the network side configuration.

[0091] Figure 3 A schematic diagram showing the structure of a user device according to some embodiments of the present disclosure is shown.

[0092] like Figure 3 As shown, the user equipment 300 of this embodiment includes: a memory 310 and a processor 320 coupled to the memory 310, and the processor 320 is configured to execute the PRACH repeated transmission method in any of the aforementioned embodiments based on instructions stored in the memory 310.

[0093] The user equipment 300 may further include an input / output interface 330 , a network interface 340 , a storage interface 350 , etc. These interfaces 330 , 340 , 350 , the memory 310 , and the processor 320 may be connected via a bus 360 , for example.

[0094] The memory 310 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs.

[0095] The processor 320 may be implemented by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistors and other discrete hardware components.

[0096] Among them, the input and output interface 330 provides a connection interface for input and output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 340 provides a connection interface for various networked devices. The storage interface 350 provides a connection interface for external storage devices such as SD cards and USB flash drives. The bus 360 can use any bus structure among a variety of bus structures. For example, the bus structure includes but is not limited to the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MCA) bus, and the Peripheral Component Interconnect (PCI) bus.

[0097] (1) A method for repeated PRACH transmission, performed by a user equipment, comprising:

[0098] Calculate a first power difference between a first power value and a second power value, wherein the first power value is a maximum output power of the user equipment, and the second power value is determined according to a PRACH target received power and a path loss value;

[0099] Determine the number of first PRACH repetition transmissions according to the network side configuration and the current first reference signal received power;

[0100] comparing a first value with the first power difference, the first value being a repetition transmission gain determined according to the number of repetition transmissions of the first PRACH;

[0101] According to the comparison result, it is determined whether to use the first PRACH repetition transmission number to perform PRACH repetition transmission.

[0102] (2) According to (1), it also includes: when using the first PRACH repetition transmission number to perform PRACH repetition transmission, updating the transmission power of each PRACH transmission opportunity to a fourth power value, wherein the fourth power value is determined based on the first power value, the second power value, and the first value.

[0103] (3) According to (2), the fourth power value is the minimum value of the first power value and the first value to be compared, and the first value to be compared is the difference between the second power value and the first value.

[0104] (4) According to (2), the fourth power value is the minimum value of the first power value and the second value to be compared, the second value to be compared is the sum of the first value to be compared and the power compensation value configured on the network side, and the first value to be compared is the difference between the second power value and the first value.

[0105] (5) According to (1-4), it also includes: when it is determined according to the comparison result that PRACH single transmission is adopted, updating the PRACH transmission power to a third power value, wherein the third power value is determined according to the first power value, the second power value, and the PRACH power climbing value.

[0106] (6) According to (5), the third power value is the minimum value of the first power value and the third value to be compared, and the third value to be compared is the sum of the second power value and the PRACH power climbing value.

[0107] (7) According to (5), the PRACH power climbing value is determined according to the product of a second value and ratio information, where the second value is the PRACH power climbing step configured on the network side, and the ratio information is determined according to the ratio of the first value to the second value.

[0108] (8) According to (7), the ratio information is a result obtained by rounding up, rounding down, or rounding off the ratio of the first value to the second value.

[0109] (9) According to (5-8), it also includes:

[0110] If a single PRACH transmission is unsuccessful, determine the number of second PRACH repetition transmissions according to the network side configuration and the current second reference signal received power;

[0111] The second PRACH repetition transmission number is used for PRACH repetition transmission, and the transmission power of each PRACH transmission opportunity is updated to a fifth power value, wherein the fifth power value is determined according to the first power value, the third power value, and a third numerical value, and the third numerical value is a repetition transmission gain determined according to the second PRACH repetition transmission number.

[0112] (10) According to (9), the fifth power value is the minimum value of the first power value and the fourth value to be compared, the fourth value to be compared is the value obtained by adding the second value to the third power value and subtracting the third value, and the second value is the PRACH power climbing step configured on the network side.

[0113] (11) According to (9), the fifth power value is the minimum value of the first power value and the fifth value to be compared, and the fifth value to be compared is a value obtained by subtracting the third value from the third power value.

[0114] (12) According to (9), determining the number of second PRACH repetition transmissions according to the network side configuration and the current second reference signal reception power includes: determining the number of second PRACH repetition transmissions by comparing the second reference signal reception power with at least one reference signal reception power threshold in the network side configuration.

[0115] (13a) According to (9), the third value is a repetition transmission gain determined based on a logarithmic operation result of the number of repetition transmissions of the second PRACH; or

[0116] (13b) According to (1-12), the first value is a repetition transmission gain determined based on a logarithmic operation result of the number of repetition transmissions of the first PRACH.

[0117] (14) According to (1-13a / b), determining the number of first PRACH repetition transmissions based on the network side configuration and the current first reference signal receiving power includes: determining the number of first PRACH repetition transmissions by comparing the first reference signal receiving power with at least one reference signal receiving power threshold in the network side configuration.

[0118] (15) According to (1-14), determining whether to use the first PRACH repetition transmission number for PRACH repetition transmission according to the comparison result includes:

[0119] When the first value is greater than the first power difference, determining to use the first number of PRACH repetition transmissions to perform PRACH repetition transmission; or,

[0120] When the first value is not greater than the first power difference, it is determined to adopt PRACH single transmission.

[0121] (16) According to (1-15), the second power value is the sum of the PRACH target received power and the path loss value.

[0122] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more non-transient computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer program code.

[0123] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0124] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0125] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0126] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A method for repeated transmission of a physical random access channel (PRACH), performed by a user equipment, comprising: Calculate a first power difference between a first power value and a second power value, wherein the first power value is a maximum output power of the user equipment, and the second power value is determined according to a PRACH target received power and a path loss value; Determine the number of first PRACH repetition transmissions according to the network side configuration and the current first reference signal received power; comparing a first value with the first power difference, the first value being a repetition transmission gain determined according to the number of repetition transmissions of the first PRACH; According to the comparison result, it is determined whether to use the first PRACH repetition transmission number to perform PRACH repetition transmission.

2. The method according to claim 1, further comprising: When the first PRACH repetition transmission number is used for PRACH repetition transmission, the transmission power of each PRACH transmission opportunity is updated to a fourth power value, and the fourth power value is determined according to the first power value, the second power value, and the first value. 3 . The method according to claim 2 , wherein the fourth power value is a minimum value between the first power value and a first value to be compared, and the first value to be compared is a difference between the second power value and the first value.

4. According to the method described in claim 2, the fourth power value is the minimum value of the first power value and the second value to be compared, the second value to be compared is the sum of the first value to be compared and the power compensation value configured on the network side, and the first value to be compared is the difference between the second power value and the first value.

5. The method according to any one of claims 1 to 4, further comprising: When it is determined according to the comparison result that PRACH single transmission is adopted, the PRACH transmission power is updated to a third power value, where the third power value is determined according to the first power value, the second power value, and the PRACH power climbing value.

6. The method according to claim 5, wherein the third power value is a minimum value between the first power value and a third value to be compared, and the third value to be compared is a sum of the second power value and the PRACH power climbing value.

7. According to the method of claim 5, the PRACH power climbing value is determined according to the product of a second value and ratio information, the second value is the PRACH power climbing step configured on the network side, and the ratio information is determined according to the ratio of the first value to the second value.

8. The method according to claim 7, wherein the ratio information is a result obtained by rounding up, rounding down, or rounding off the ratio of the first value to the second value.

9. The method according to claim 5, further comprising: In the case where a single PRACH transmission is unsuccessful, determining the number of second PRACH repetition transmissions according to the network side configuration and the current second reference signal received power; The second PRACH repetition transmission number is used for PRACH repetition transmission, and the transmission power of each PRACH transmission opportunity is updated to a fifth power value, wherein the fifth power value is determined according to the first power value, the third power value, and a third numerical value, and the third numerical value is a repetition transmission gain determined according to the second PRACH repetition transmission number.

10. According to the method according to claim 9, the fifth power value is the minimum value of the first power value and the fourth value to be compared, the fourth value to be compared is the value obtained by adding the second value to the third power value and subtracting the third value, and the second value is the PRACH power climbing step configured on the network side.

11. The method according to claim 9, wherein the fifth power value is the minimum value of the first power value and the fifth value to be compared, and the fifth value to be compared is a value obtained by subtracting the third value from the third power value.

12. The method according to claim 9, determining the second PRACH repetition transmission times according to the network side configuration and the current second reference signal received power comprises: The second PRACH repetition transmission number is determined by comparing the second reference signal received power with at least one reference signal received power threshold in the network side configuration.

13. The method according to claim 9, The third value is a repetition transmission gain determined according to a logarithmic operation result of the number of repetition transmissions of the second PRACH; or, The first value is a repetition transmission gain determined according to a logarithmic operation result of the number of repetition transmissions of the first PRACH.

14. The method according to any one of claims 1 to 4, determining the first PRACH repetition transmission number according to the network side configuration and the current first reference signal received power comprises: The first PRACH repetition transmission number is determined by comparing the first reference signal received power with at least one reference signal received power threshold in the network side configuration.

15. The method according to any one of claims 1 to 4, determining whether to use the first PRACH repetition transmission number for PRACH repetition transmission according to the comparison result comprises: When the first value is greater than the first power difference, determining to use the first number of PRACH repetition transmissions to perform PRACH repetition transmission; or, When the first value is not greater than the first power difference, it is determined to adopt PRACH single transmission.

16. According to the method according to any one of claims 1-4, the second power value is the sum of the PRACH target received power and the path loss value.

17. A user equipment, comprising: A module for executing the method according to any one of claims 1 to 16.

18. A user equipment, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the method of any one of claims 1-16 based on instructions stored in the memory.

19. A non-transitory computer-readable storage medium having a computer program stored thereon, wherein when the program is executed by a processor, the steps of the method according to any one of claims 1 to 16 are implemented.

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