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 method comprises the following steps that: user equipment determines a first PRACH repeated transmission frequency according to network side configuration, calculates first transmission power at a plurality of PRACH transmission opportunities, and performs PRACH repeated transmission according to the first PRACH repeated transmission frequency and the first transmission power; and under the condition that the PRACH repeated transmission is not successful, calculating a second transmission power at a plurality of PRACH transmission opportunities, and performing retransmission of the PRACH repeated transmission according to the second transmission power, the second transmission power being greater than the first transmission power. A power rising method suitable for PRACH repeated transmission is provided, and 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 fails and needs to retransmit a new PRACH.

[0003] When PRACH transmission fails, the transmission power will be increased during retransmission to increase the probability of successful PRACH transmission. After the introduction of PRACH repetition (or multiple transmissions) technology, one PRACH transmission process includes multiple PRACH transmissions, and the original power increase mechanism is no longer applicable. Summary of the invention

[0004] The disclosed embodiment proposes a power ramp-up method applicable to PRACH repeated transmission to improve the PRACH transmission success rate. In addition, a repeated transmission times adjustment method applicable to PRACH repeated transmission is also proposed to further improve the PRACH transmission success rate.

[0005] Some embodiments of the present disclosure provide a method for repeated PRACH transmission, which is performed by a user equipment and includes:

[0006] Determine a first PRACH repetition transmission number according to a network side configuration, calculate a first transmission power at a plurality of PRACH transmission opportunities, and perform PRACH repetition transmission according to the first PRACH repetition transmission number and the first transmission power;

[0007] In the case that the PRACH repeated transmission is unsuccessful, a second transmission power is calculated at a plurality of PRACH transmission opportunities, and the PRACH repeated transmission is retransmitted according to the second transmission power, wherein the second transmission power is greater than the first transmission power.

[0008] In some embodiments, calculating the second transmission power over a plurality of PRACH transmission opportunities comprises:

[0009] According to the maximum output power of the user equipment, the PRACH power climbing step configured on the network side, and the number of PRACH transmissions, the second transmission power at multiple PRACH transmission opportunities is calculated, wherein one PRACH repeated transmission process is recorded as one in the number of PRACH transmissions.

[0010] In some embodiments, the second transmission power is the minimum value of the maximum output power of the user equipment and a second value to be compared, and the second value to be compared is determined according to the PRACH power climbing step and the number of PRACH transmissions.

[0011] In some embodiments, the second value to be compared is determined based on the PRACH power climbing value, in combination with at least one of the PRACH target received power, the second path loss value, the power adjustment value configured on the network side, and the gain value calculated based on the number of PRACH repeated transmissions during retransmission, and the PRACH power climbing value is determined based on the PRACH power climbing step size and the number of PRACH transmissions.

[0012] In some embodiments, the second value to be compared is the PRACH target received power plus the second path loss value, the power adjustment value, the PRACH power climb value, and minus a gain value calculated based on the number of PRACH repeated transmissions during retransmission.

[0013] In some embodiments, the number of PRACH repetition transmissions during retransmission is equal to the first number of PRACH repetition transmissions.

[0014] In some embodiments, the gain value calculated according to the number of PRACH repetition transmissions during retransmission is determined according to a logarithmic operation result of the number of PRACH repetition transmissions during retransmission.

[0015] In some embodiments, the number of PRACH transmissions increases by 1 each time the PRACH is retransmitted and a first condition is met, wherein the first condition is that the user equipment selects the same reference signal as the previous PRACH retransmission during PRACH retransmission.

[0016] In some embodiments, retransmitting the PRACH repeated transmission includes: retransmitting the PRACH repeated transmission when the PRACH repeated transmission is unsuccessful and the first PRACH transmission number is less than a first threshold value.

[0017] In some embodiments, the first threshold value is the maximum number of PRACH transmissions configured by the network side.

[0018] In some embodiments, the second path loss value is a path loss value obtained based on a second downlink reference signal measurement, the second downlink reference signal and the first downlink reference signal are the same type of signals, and the first downlink reference signal is a reference signal used when calculating the path loss value for repeated transmission of the PRACH.

[0019] In some embodiments, retransmitting the PRACH repeated transmission according to the second transmission power includes: retransmitting the PRACH repeated transmission using the same second transmission power at multiple PRACH transmission occasions.

[0020] In some embodiments, it also includes: after performing at least one retransmission of PRACH repetition transmission, when the second transmission power is greater than or equal to the second threshold value and there is a second PRACH repetition transmission number that is greater than the first PRACH repetition transmission number, retransmitting the PRACH repetition transmission according to the second PRACH repetition transmission number.

[0021] In some embodiments, the second threshold value is the maximum output power of the user equipment.

[0022] In some embodiments, retransmitting PRACH repeated transmission according to the second PRACH repeated transmission number includes: calculating a third transmission power at multiple PRACH transmission opportunities according to the PRACH power climbing step configured on the network side and the number of PRACH transmissions and the second PRACH repeated transmission number, and retransmitting PRACH repeated transmission according to the second PRACH repeated transmission number and the third transmission power.

[0023] In some embodiments, the third transmission power is the minimum value of the maximum output power of the user equipment and the third value to be compared, and the third value to be compared is determined according to the PRACH power climbing value and the gain value calculated according to the second PRACH repeated transmission number, and the PRACH power climbing value is determined according to the PRACH power climbing step and the PRACH transmission number.

[0024] In some embodiments, the third value to be compared is determined based on the PRACH power climb value and the gain value calculated based on the second PRACH repeated transmission times, and combined with at least one of the PRACH target receiving power, the second path loss value, and the power adjustment value configured on the network side.

[0025] In some embodiments, the third value to be compared is the PRACH target received power plus the second path loss value, the power adjustment value, the PRACH power climb value, and minus a gain value calculated based on the second PRACH repeated transmission times.

[0026] In some embodiments, determining the first PRACH repetition transmission number includes: determining the first PRACH repetition transmission number by comparing the current first downlink reference signal reception power with the at least one reference signal reception power threshold in the network side configuration, the smaller the first downlink reference signal reception power is relative to the at least one reference signal reception power threshold, the greater the first PRACH repetition transmission number.

[0027] In some embodiments, the first transmission power is a minimum value of a maximum output power of the user equipment and a first value to be compared, and the first value to be compared is determined according to the number of repeated transmissions of the first PRACH.

[0028] In some embodiments, the first value to be compared is determined using a gain value calculated based on the first PRACH repetition transmission times, and combined with at least one of a PRACH target receiving power, a first path loss value, and a power adjustment value configured on the network side.

[0029] In some embodiments, the first value to be compared is a value obtained by adding the first path loss value, the power adjustment value, and the PRACH target received power minus a gain value calculated according to the first PRACH repetition transmission number.

[0030] In some embodiments, performing PRACH repetition transmission according to the first PRACH repetition transmission number and the first transmission power includes: performing PRACH repetition transmission using the same first transmission power at multiple PRACH transmission occasions corresponding to the first PRACH repetition transmission number.

[0031] Some embodiments of the present disclosure provide a user equipment, including: a module for executing a method for repeated PRACH transmission.

[0032] Some embodiments of the present disclosure provide a user equipment, comprising: a memory; and a processor coupled to the memory, wherein the processor is configured to execute a method for PRACH repeated transmission based on instructions stored in the memory.

[0033] 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 method for repeated PRACH transmission when the program is executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] 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.

[0036] Figure 1 A flowchart illustrating a method for repeated PRACH transmission according to some embodiments of the present disclosure is shown.

[0037] Figure 2 A schematic diagram showing the structure of a user device according to some embodiments of the present disclosure is shown.

[0038] Figure 3 A schematic diagram showing the structure of a user equipment according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0039] 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.

[0040] Unless otherwise specified, descriptions such as “first”, “second”, and “third” in the present disclosure are used to distinguish different objects and are not used to indicate meanings such as size or time sequence.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Figure 1 A flowchart illustrating a method for repeated PRACH transmission according to some embodiments of the present disclosure is shown.

[0046] like Figure 1 As shown, the PRACH repeated transmission method of this embodiment includes: steps S1-S2, and may also include S3.

[0047] In step S1, the user equipment determines the number of first PRACH repetition transmissions according to the network side configuration, and calculates the first transmission power at multiple PRACH transmission opportunities corresponding to the PRACH.

[0048] 1-1) The first transmission power is the minimum value of the maximum output power of the user equipment and the first value to be compared, and the first value to be compared is determined according to the first PRACH repeated transmission number. The first value to be compared is determined by using the gain value calculated according to the first PRACH repeated transmission number, and combining at least one of the PRACH target received power, the first path loss value, and the power adjustment value configured on the network side. The first value to be compared is the PRACH target received power plus the first path loss value, the power adjustment value, and the value obtained by subtracting the gain value calculated according to the first PRACH repeated transmission number.

[0049] The first transmission power at multiple PRACH transmission opportunities is calculated as follows:

[0050] P1 = min(P CMAX , P PRACH,atarget + PL1 + Δ - 10 × log10(First PRACH retransmission count))

[0051] wherein, P CMAX is the maximum output power of the user equipment, P PRACH,target is the target received power of the PRACH, PL1 is the path loss value obtained by measuring based on the first downlink reference signal, Δ is the power adjustment value configured by the network side, and 10 × log10(First PRACH retransmission count) is the gain value calculated according to the first PRACH retransmission count.

[0052] The first downlink reference signal includes at least one of the following: Synchronization Signal Block (SSB), other broadcast signals except SSB, and Channel State Information Reference Signal (CSI-RS).

[0053] When calculating the first transmission power on multiple transmission opportunities, the same reference signal is used to calculate the values of each PL1.

[0054] 1 - 2) Determining the first PRACH retransmission count includes: determining the first PRACH retransmission count by comparing the received power of the current first downlink reference signal with at least one reference signal received power threshold in the network side configuration. The smaller the received power of the first downlink reference signal relative to the at least one reference signal received power threshold, the larger the first PRACH retransmission count.

[0055] 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.

[0056] 1 - 3) Use the same first transmission power on multiple PRACH transmission opportunities for PRACH retransmission.

[0057] In step S2, if the PRACH is successfully transmitted or the first PRACH transmission number is not less than the first threshold value, the process ends. If the PRACH fails to be successfully transmitted and the first PRACH transmission number is less than the first threshold value, the user equipment performs retransmission of PRACH repeated transmission according to the network side configuration, and calculates the second transmission power at the corresponding multiple PRACH transmission opportunities. The second transmission power is greater than the first transmission power. Thus, by increasing the transmission power at multiple PRACH transmission opportunities of PRACH repeated transmission, the PRACH transmission success rate is improved.

[0058] 2-1) The first threshold value is configured by the network side. An embodiment may be that the first threshold value is the maximum number of PRACH transmissions configured by the network side.

[0059] 2-2) When performing retransmission of the PRACH repeated transmission, the number of PRACH repeated transmissions during retransmission may be equal to the first number of PRACH repeated transmissions, for example.

[0060] 2-3) Calculating the second transmission power at multiple PRACH transmission opportunities includes: calculating the second transmission power at multiple PRACH transmission opportunities according to the PRACH power climbing step configured on the network side and the number of PRACH transmissions, wherein one PRACH repeated transmission process is recorded as one time in the number of PRACH transmissions. The second transmission power is the minimum value of the maximum output power of the user equipment and the second value to be compared, and the second value to be compared is determined according to the PRACH power climbing step and the number of PRACH transmissions. The second value to be compared is determined according to the PRACH power climbing value, in combination with at least one of the PRACH target received power, the second path loss value, the power adjustment value configured on the network side, and the gain value calculated according to the number of PRACH repeated transmissions during retransmission, and the PRACH power climbing value is determined according to the PRACH power climbing step and the number of PRACH transmissions. The second value to be compared is a value obtained by adding the second path loss value, the power adjustment value, the PRACH power ramp value, and subtracting a gain value calculated according to the number of PRACH repeated transmissions during retransmission. The gain value calculated according to the number of PRACH repeated transmissions during retransmission is determined according to a logarithmic operation result of the number of PRACH repeated transmissions during retransmission.

[0061] The second transmission power at multiple PRACH transmission opportunities is calculated as follows:

[0062] P2=min(P CMAX ,P PRACH,target +PL2+Δ+(Counter-1)×ΔStep

[0063] -10×log10(number of first PRACH repetition transmissions)

[0064] Where Counter is the value of the counter of the number of PRACH transmissions, and the initial value of Counter is 1. When the PRACH transmission fails and the next retransmission is performed, the value of Counter increases by 1 when the first condition is met; otherwise, the value of Counter remains unchanged. It should be noted that a PRACH retransmission process or a retransmission process of a PRACH retransmission is regarded as a whole, and the number of PRACH transmissions is counted. That is, even if a PRACH retransmission process includes multiple PRACH transmissions, it is only counted as 1 in the Counter count, and the value of Counter is only increased by 1.

[0065] The first condition is that the user equipment selects the same reference signal as the previous PRACH repeated transmission during PRACH retransmission.

[0066] Δ Step It is the PRACH power climbing step size configured on the network side.

[0067] PL2 is a path loss value obtained based on the second downlink reference signal measurement.

[0068] The second downlink reference signal and the first downlink reference signal are signals of the same type.

[0069] The value of PL2 can be the same as the value of PL1.

[0070] When the PRACH calculates the transmission power at the corresponding multiple transmission occasions, the same reference signal is used to calculate the value of PL2.

[0071] 2-4) Retransmitting PRACH repeated transmissions using the same second transmission power at multiple PRACH transmission occasions.

[0072] 2-5) Step S2 may perform one or more retransmissions of PRACH retransmissions. Each time a retransmission is performed, the value of the number of PRACH transmissions increases by 1, and the corresponding second transmission power also increases. When the second transmission power increases to a certain extent, step S3 is performed.

[0073] In step S3, when the second transmission power on multiple PRACH transmission occasions during a certain retransmission is greater than or equal to the second threshold value, and there is a second PRACH retransmission number that meets the condition, the user equipment retransmits the PRACH retransmission according to the second PRACH retransmission number, and recalculates the third transmission power on the multiple PRACH transmission occasions corresponding to the PRACH. Thus, when simply increasing the transmission power on multiple PRACH transmission occasions of PRACH retransmission still cannot successfully transmit PRACH, the PRACH retransmission number is increased at the same time to perform PRACH retransmission, thereby improving the PRACH transmission success rate.

[0074] 3-1) The second threshold value is a power threshold value configured by the network side. In one embodiment, the second threshold value is equal to P CMAX .

[0075] 3-2) The second PRACH repetition transmission number is configured by the network side and satisfies the second PRACH repetition transmission number>the first PRACH repetition transmission number.

[0076] 3-3) Calculate the third transmission power at multiple PRACH transmission opportunities according to the PRACH power climbing step size configured on the network side, the number of PRACH transmissions, and the second PRACH repeated transmission number.

[0077] The third transmission power is the minimum value of the maximum output power of the user equipment and the third value to be compared, and the third value to be compared is determined according to the PRACH power climbing value and the gain value calculated according to the second PRACH repeated transmission number, and the PRACH power climbing value is determined according to the PRACH power climbing step and the PRACH transmission number.

[0078] The third value to be compared is determined according to the PRACH power climb value and the gain value calculated according to the second PRACH repeated transmission times, and in combination with at least one of the PRACH target received power, the second path loss value, and the power adjustment value configured on the network side.

[0079] The third value to be compared is a value obtained by adding the second path loss value, the power adjustment value, the PRACH power climbing value to the PRACH target received power, and subtracting a gain value calculated according to the second PRACH repeated transmission number.

[0080] The third transmission power at multiple PRACH transmission opportunities is calculated as follows:

[0081] P3=min(P CMAX ,P PRACH,target+PL2+Δ+Counter×Δ Step

[0082] -10×log10(number of second PRACH repetition transmissions)

[0083] Wherein, 10×log10 (second PRACH repetition transmission number) is a gain value calculated according to the second PRACH repetition transmission number. The meanings of other symbols are as mentioned above and will not be repeated here.

[0084] The disclosed embodiment proposes a power ramp-up method applicable to PRACH repeated transmission to improve the PRACH transmission success rate, and also proposes a repeated transmission times adjustment method applicable to PRACH repeated transmission to further improve the PRACH transmission success rate. In addition, the persistent interference caused by continuous PRACH retransmission is reduced.

[0085] Figure 2 A schematic diagram showing the structure of a user equipment according to some embodiments of the present disclosure is shown.

[0086] like Figure 2 As shown, the user equipment 200 of this embodiment includes: a module for executing the method for repeated PRACH transmission. The user equipment 200 includes modules 210 - 220 , and may further include module 230 .

[0087] The first repetition transmission module 210 is configured to determine the first PRACH repetition transmission number according to the network side configuration, calculate the first transmission power at multiple PRACH transmission opportunities, and perform PRACH repetition transmission according to the first PRACH repetition transmission number and the first transmission power.

[0088] The first repeated transmission module 210 is configured to determine the number of first PRACH repeated transmissions by comparing the current first downlink reference signal received power with the size relationship of at least one reference signal received power threshold in the network side configuration, the smaller the first downlink reference signal received power is relative to the at least one reference signal received power threshold, the greater the number of first PRACH repeated transmissions.

[0089] The first transmission power is a minimum value between a maximum output power of the user equipment and a first value to be compared, and the first value to be compared is determined according to the number of repeated transmissions of the first PRACH.

[0090] The first value to be compared is determined by using a gain value calculated according to the number of repeated transmissions of the first PRACH, and combining at least one of a PRACH target received power, a first path loss value, and a power adjustment value configured on the network side.

[0091] The first value to be compared is a value obtained by adding the first path loss value, the power adjustment value, and the PRACH target received power to a gain value calculated according to the number of repeated transmissions of the first PRACH.

[0092] The first repeated transmission module 210 is configured to perform PRACH repeated transmission using the same first transmission power on a plurality of PRACH transmission occasions corresponding to the first PRACH repeated transmission number.

[0093] The second repeated transmission module 220 is configured to calculate a second transmission power at multiple PRACH transmission opportunities when PRACH repeated transmission is unsuccessful, and retransmit the PRACH repeated transmission according to the second transmission power, wherein the second transmission power is greater than the first transmission power.

[0094] The second repetitive transmission module 220 is configured to calculate the second transmission power at multiple PRACH transmission opportunities according to the PRACH power climbing step configured by the network side and the number of PRACH transmissions, wherein one PRACH repetitive transmission process is recorded as one in the number of PRACH transmissions.

[0095] The second transmission power is a minimum value of a maximum output power of the user equipment and a second value to be compared, and the second value to be compared is determined according to the PRACH power climbing step and the number of PRACH transmissions.

[0096] The second value to be compared is determined according to the PRACH power climb value, in combination with at least one of the PRACH target received power, the second path loss value, the power adjustment value configured on the network side, and the gain value calculated according to the number of PRACH repeated transmissions during retransmission. The PRACH power climb value is determined according to the PRACH power climb step and the number of PRACH transmissions.

[0097] The second value to be compared is the PRACH target received power plus the second path loss value, the power adjustment value, the PRACH power climb value, and a value obtained by subtracting a gain value calculated according to the number of PRACH repeated transmissions during retransmission.

[0098] The number of PRACH repetition transmissions during retransmission is equal to the first number of PRACH repetition transmissions.

[0099] The gain value calculated according to the number of PRACH repeated transmissions during retransmission is determined according to a logarithmic operation result of the number of PRACH repeated transmissions during retransmission.

[0100] The number of PRACH transmissions increases by 1 each time the PRACH is retransmitted and a first condition is met, wherein the first condition is that the user equipment selects the same reference signal as the previous PRACH repeated transmission during PRACH retransmission.

[0101] The second repeated transmission module 220 is configured to retransmit the PRACH repeated transmission when the PRACH repeated transmission is unsuccessful and the first PRACH transmission number is less than a first threshold.

[0102] The first threshold value is the maximum number of PRACH transmissions configured by the network side.

[0103] The second path loss value is a path loss value obtained based on measurement of a second downlink reference signal, the second downlink reference signal and the first downlink reference signal are the same type of signals, and the first downlink reference signal is a reference signal used when calculating the path loss value for repeated transmission of the PRACH.

[0104] The second repeated transmission module 220 is configured to perform retransmission of PRACH repeated transmission using the same second transmission power on multiple PRACH transmission occasions.

[0105] The third repetition transmission module 230 is configured to, after at least one retransmission of PRACH repetition transmission, retransmit the PRACH repetition transmission according to the second PRACH repetition transmission number when the second transmission power is greater than or equal to the second threshold value and there is a second PRACH repetition transmission number that is greater than the first PRACH repetition transmission number.

[0106] The second threshold value is the maximum output power of the user equipment.

[0107] The third repeated transmission module 230 is configured to calculate the third transmission power at multiple PRACH transmission opportunities according to the PRACH power climbing step configured on the network side, the number of PRACH transmissions, and the second PRACH repeated transmission number, and retransmit the PRACH repeated transmission according to the second PRACH repeated transmission number and the third transmission power.

[0108] The third transmission power is the minimum value of the maximum output power of the user equipment and the third value to be compared, and the third value to be compared is determined according to the PRACH power climbing value and the gain value calculated according to the second PRACH repeated transmission number, and the PRACH power climbing value is determined according to the PRACH power climbing step and the PRACH transmission number.

[0109] The third value to be compared is determined according to the PRACH power climb value and the gain value calculated according to the second PRACH repeated transmission times, and in combination with at least one of the PRACH target received power, the second path loss value, and the power adjustment value configured on the network side.

[0110] The third value to be compared is a value obtained by adding the second path loss value, the power adjustment value, the PRACH power climbing value to the PRACH target received power, and subtracting a gain value calculated according to the second PRACH repeated transmission number.

[0111] Figure 3 A schematic diagram showing the structure of a user equipment according to some embodiments of the present disclosure is shown.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] (1) A method for repeated PRACH transmission, performed by a user equipment, comprising:

[0118] Determine a first PRACH repetition transmission number according to a network side configuration, calculate a first transmission power at a plurality of PRACH transmission opportunities, and perform PRACH repetition transmission according to the first PRACH repetition transmission number and the first transmission power;

[0119] In the case that the PRACH repeated transmission is unsuccessful, a second transmission power is calculated at a plurality of PRACH transmission opportunities, and the PRACH repeated transmission is retransmitted according to the second transmission power, wherein the second transmission power is greater than the first transmission power.

[0120] (2) According to (1), calculating the second transmission power at multiple PRACH transmission opportunities includes: calculating the second transmission power at multiple PRACH transmission opportunities according to the maximum output power of the user equipment, the PRACH power climbing step configured by the network side, and the number of PRACH transmissions, wherein one PRACH repeated transmission process is recorded as one time in the number of PRACH transmissions.

[0121] (3) According to (1-2), the second transmission power is the minimum value of the maximum output power of the user equipment and the second value to be compared, and the second value to be compared is determined according to the PRACH power climbing step and the number of PRACH transmissions.

[0122] (4) According to (3), the second value to be compared is determined according to the PRACH power climbing value, in combination with at least one of the PRACH target received power, the second path loss value, the power adjustment value configured on the network side, and the gain value calculated according to the number of PRACH repeated transmissions during retransmission, and the PRACH power climbing value is determined according to the PRACH power climbing step size and the number of PRACH transmissions.

[0123] (5) According to (3-4), the second value to be compared is the PRACH target received power plus the second path loss value, the power adjustment value, the PRACH power climb value, and minus the gain value calculated according to the number of PRACH repeated transmissions during retransmission.

[0124] (6a) According to (1-5), the number of PRACH repetition transmissions during retransmission is equal to the first number of PRACH repetition transmissions.

[0125] (6b) According to (1-5), the gain value calculated according to the number of PRACH repeated transmissions during retransmission is determined according to the logarithmic operation result of the number of PRACH repeated transmissions during retransmission.

[0126] (7) According to (2-6a / b), the number of PRACH transmissions increases by 1 each time the PRACH is retransmitted and a first condition is met, wherein the first condition is that the user equipment selects the same reference signal as the previous PRACH retransmission during PRACH retransmission.

[0127] (8) According to (2-7), performing retransmission of PRACH repetition transmission includes: performing retransmission of PRACH repetition transmission when PRACH repetition transmission is unsuccessful and the first PRACH transmission number is less than a first threshold value.

[0128] (9) According to (8), the first threshold value is the maximum number of PRACH transmissions configured by the network side.

[0129] (10) According to (4-9), the second path loss value is a path loss value obtained based on a second downlink reference signal measurement, the second downlink reference signal and the first downlink reference signal are the same type of signals, and the first downlink reference signal is a reference signal used when calculating the path loss value for the PRACH repeated transmission.

[0130] (11) According to (1-10), retransmitting the PRACH repeated transmission according to the second transmission power includes: retransmitting the PRACH repeated transmission using the same second transmission power at multiple PRACH transmission occasions.

[0131] (12) According to (1-11), it also includes: after performing at least one retransmission of PRACH repetition transmission, when the second transmission power is greater than or equal to the second threshold value and there is a second PRACH repetition transmission number that is greater than the first PRACH repetition transmission number, retransmitting the PRACH repetition transmission according to the second PRACH repetition transmission number.

[0132] (13) According to (12), the second threshold value is the maximum output power of the user equipment.

[0133] (14) According to (12-13), retransmitting PRACH repeated transmission according to the second PRACH repeated transmission number includes: calculating the third transmission power at multiple PRACH transmission opportunities according to the PRACH power climbing step configured on the network side and the number of PRACH transmissions and the second PRACH repeated transmission number, and retransmitting PRACH repeated transmission according to the second PRACH repeated transmission number and the third transmission power.

[0134] (15) According to (14), the third transmission power is the minimum value of the maximum output power of the user equipment and the third value to be compared, the third value to be compared is determined according to the PRACH power climbing value and the gain value calculated according to the number of repeated transmissions of the second PRACH, and the PRACH power climbing value is determined according to the PRACH power climbing step and the number of PRACH transmissions.

[0135] (16) According to (15), the third value to be compared is determined based on the PRACH power climb value and the gain value calculated based on the second PRACH repeated transmission times, and combined with at least one of the PRACH target receiving power, the second path loss value, and the power adjustment value configured on the network side.

[0136] (17) According to (15-16), the third value to be compared is the PRACH target receiving power plus the second path loss value, the power adjustment value, the PRACH power climbing value, and the value obtained by subtracting the gain value calculated according to the number of repeated transmissions of the second PRACH.

[0137] (18) According to (1-17), determining the number of first PRACH repetition transmissions includes: determining the number of first PRACH repetition transmissions by comparing the current first downlink reference signal reception power with at least one reference signal reception power threshold in the network side configuration, the smaller the first downlink reference signal reception power is relative to the at least one reference signal reception power threshold, the greater the number of first PRACH repetition transmissions.

[0138] (19) According to (1-18), the first transmission power is the minimum value of the maximum output power of the user equipment and the first value to be compared, and the first value to be compared is determined according to the number of repeated transmissions of the first PRACH.

[0139] (20) According to (19), the first value to be compared is determined by using a gain value calculated based on the number of repeated transmissions of the first PRACH, and combining at least one of the PRACH target receiving power, the first path loss value, and the power adjustment value configured on the network side.

[0140] (21) According to (19), the first value to be compared is the PRACH target received power plus the first path loss value, the power adjustment value, and a value obtained by subtracting a gain value calculated according to the number of repeated transmissions of the first PRACH.

[0141] (22) According to (1-21), performing PRACH repetition transmission according to the first PRACH repetition transmission number and the first transmission power includes: performing PRACH repetition transmission using the same first transmission power at multiple PRACH transmission occasions corresponding to the first PRACH repetition transmission number.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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: Determine a first PRACH repetition transmission number according to a network side configuration, calculate a first transmission power at a plurality of PRACH transmission opportunities, and perform PRACH repetition transmission according to the first PRACH repetition transmission number and the first transmission power; In the case that the PRACH repeated transmission is unsuccessful, a second transmission power is calculated at a plurality of PRACH transmission opportunities, and the PRACH repeated transmission is retransmitted according to the second transmission power, wherein the second transmission power is greater than the first transmission power.

2. The method according to claim 1, calculating the second transmission power at multiple PRACH transmission opportunities comprises: According to the maximum output power of the user equipment, the PRACH power climbing step configured on the network side, and the number of PRACH transmissions, the second transmission power at multiple PRACH transmission opportunities is calculated, wherein one PRACH repeated transmission process is recorded as one in the number of PRACH transmissions.

3. According to the method of claim 2, the second transmission power is the minimum value of the maximum output power of the user equipment and the second value to be compared, and the second value to be compared is determined according to the PRACH power climbing step and the number of PRACH transmissions.

4. According to the method of claim 3, the second value to be compared is determined according to the PRACH power climbing value, in combination with at least one of the PRACH target received power, the second path loss value, the power adjustment value configured on the network side, and the gain value calculated according to the number of PRACH repeated transmissions during retransmission, and the PRACH power climbing value is determined according to the PRACH power climbing step size and the number of PRACH transmissions.

5. According to the method of claim 4, the second value to be compared is the PRACH target receiving power plus the second path loss value, the power adjustment value, the PRACH power climbing value, and minus the gain value calculated according to the number of PRACH repeated transmissions during retransmission.

6. The method according to any one of claims 4 to 5, wherein the number of PRACH repetition transmissions during retransmission is equal to the first PRACH repetition transmission number; or The gain value calculated according to the number of PRACH repeated transmissions during retransmission is determined according to a logarithmic operation result of the number of PRACH repeated transmissions during retransmission.

7. According to the method described in any one of claims 2-5, the number of PRACH transmissions increases by 1 each time PRACH is retransmitted and a first condition is met, wherein the first condition is that the user equipment selects the same reference signal as the previous PRACH repeated transmission during PRACH retransmission.

8. According to the method according to any one of claims 2 to 5, performing retransmission of PRACH repeated transmission comprises: When the PRACH repeated transmission is unsuccessful and the first PRACH transmission number is less than a first threshold value, retransmission of the PRACH repeated transmission is performed.

9. According to the method of claim 8, the first threshold value is the maximum number of PRACH transmissions configured by the network side.

10. According to the method described in any one of claims 4-5, the second path loss value is a path loss value obtained based on a second downlink reference signal measurement, the second downlink reference signal and the first downlink reference signal are the same type of signals, and the first downlink reference signal is a reference signal used when calculating the path loss value of the PRACH repeated transmission.

11. The method according to any one of claims 1 to 5, performing retransmission of PRACH repeated transmission according to the second transmission power comprises: The same second transmission power is used to perform retransmission of PRACH repeated transmission on multiple PRACH transmission occasions.

12. The method according to any one of claims 1 to 5, further comprising: After performing at least one retransmission of PRACH repetition transmission, when the second transmission power is greater than or equal to the second threshold value and there is a second PRACH repetition transmission number that is greater than the first PRACH repetition transmission number, retransmit the PRACH repetition transmission according to the second PRACH repetition transmission number.

13. The method according to claim 12, wherein the second threshold value is a maximum output power of the user equipment.

14. The method according to claim 12, performing retransmission of PRACH repetition transmission according to the second PRACH repetition transmission number comprises: According to the PRACH power climbing step size configured on the network side, the number of PRACH transmissions, and the second PRACH repeated transmission number, the third transmission power at multiple PRACH transmission times is calculated, and the PRACH repeated transmission is retransmitted according to the second PRACH repeated transmission number and the third transmission power.

15. According to the method of claim 14, the third transmission power is the minimum value of the maximum output power of the user equipment and the third value to be compared, the third value to be compared is determined according to the PRACH power climbing value and the gain value calculated according to the second PRACH repeated transmission number, and the PRACH power climbing value is determined according to the PRACH power climbing step and the PRACH transmission number.

16. According to the method of claim 15, the third value to be compared is determined based on the PRACH power climb value and the gain value calculated according to the second PRACH repeated transmission times, and combined with at least one of the PRACH target receiving power, the second path loss value, and the power adjustment value configured on the network side.

17. According to the method of claim 16, the third value to be compared is the PRACH target received power plus the second path loss value, the power adjustment value, the PRACH power climbing value, and a value obtained by subtracting a gain value calculated according to the second PRACH repeated transmission number.

18. According to the method according to any one of claims 1 to 5, determining the first PRACH repetition transmission number comprises: By comparing the current first downlink reference signal received power with the at least one reference signal received power threshold in the network side configuration, the number of first PRACH repetition transmissions is determined, the smaller the first downlink reference signal received power is relative to the at least one reference signal received power threshold, the greater the number of first PRACH repetition transmissions.

19. According to the method according to any one of claims 1-5, the first transmission power is the minimum value of the maximum output power of the user equipment and a first value to be compared, and the first value to be compared is determined according to the number of repeated transmissions of the first PRACH.

20. According to the method of claim 19, the first value to be compared is determined by using a gain value calculated according to the number of repeated transmissions of the first PRACH, and combining at least one of a PRACH target receiving power, a first path loss value, and a power adjustment value configured on the network side.

21. According to the method of claim 20, the first value to be compared is the PRACH target received power plus the first path loss value, the power adjustment value, and a value obtained by subtracting a gain value calculated according to the number of repeated transmissions of the first PRACH.

22. The method according to any one of claims 1 to 5, performing PRACH repeated transmission according to the first PRACH repeated transmission number and the first transmission power comprises: The same first transmission power is used to perform PRACH repetition transmission on multiple PRACH transmission occasions corresponding to the first PRACH repetition transmission number.

23. A user equipment, comprising: A module for executing the method according to any one of claims 1 to 22.

24. 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 1-22 based on instructions stored in the memory.

25. A non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method according to any one of claims 1 to 22.

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