WO2024093639A1

WO2024093639A1 - Method and apparatus for controlling prach transmission power in random access procedure

Info

Publication number: WO2024093639A1
Application number: PCT/CN2023/124268
Authority: WO
Inventors: 沈姝伶; 邢艳萍; 高雪娟; 司倩倩
Original assignee: 大唐移动通信设备有限公司
Priority date: 2022-11-04
Filing date: 2023-10-12
Publication date: 2024-05-10
Also published as: CN117998558A

Abstract

Embodiments of the present disclosure provide a method and apparatus for controlling PRACH transmission power in a random access procedure. The method comprises: a terminal determines PRACH transmission power of an Nth random access attempt on the basis of a reference signal selected in the Nth random access attempt and the number of PRACH transmissions of the Nth random access attempt, wherein N is an integer greater than 1, and the number of PRACH transmissions of the Nth random access attempt is greater than or equal to 1.

Description

Method and device for controlling PRACH transmission power in random access process

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to a Chinese patent application with application number 202211379127.X filed on November 4, 2022, and invention name “Method and device for controlling PRACH transmission power in random access process”, which is incorporated herein by reference in its entirety.

Technical Field

The present disclosure relates to the field of wireless communication technology, and in particular to a method and device for controlling PRACH transmission power in a random access process.

Background technique

In the design of random access in the New Radio (NR) system, the terminal can increase the probability of successful random access by increasing the transmit power of the Physical Random Access Channel (PRACH) (also known as power ramping) after a random access attempt fails. Specifically, when the terminal makes the first random access attempt, it will calculate the initial power of PRACH transmission. When the initial random access fails and the second, third or even more random access attempts are made, the terminal can increase the transmit power based on the initial transmit power of PRACH.

In the prior art, only one PRACH is sent during a random access attempt. Therefore, there is currently no power ramp-up mechanism for sending multiple PRACHs during a random access attempt. As a result, it is impossible to increase the transmission power of the PRACH when multiple PRACHs are sent during a random access attempt, which limits the flexibility of the random access design and cannot further improve the success rate of random access.

Summary of the invention

In view of the problems existing in the prior art, the embodiments of the present disclosure provide a method and device for controlling PRACH transmission power in a random access process.

In a first aspect, an embodiment of the present disclosure provides a method for controlling the transmission power of a physical random access channel (PRACH) in a random access process, which is applied to a terminal and includes:

Based on the reference signal selected by the Nth random access attempt and the Nth random access attempt A number of PRACH transmissions, determining a PRACH transmit power for the Nth random access attempt;

Wherein, N is an integer greater than 1, and the number of PRACH transmissions in the Nth random access attempt is greater than or equal to 1.

In some embodiments, determining the PRACH transmit power of the Nth random access attempt based on the reference signal selected by the Nth random access attempt and the number of PRACH transmissions of the Nth random access attempt includes:

Determine the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected for the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt; or,

Determine the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected for the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt.

In some embodiments, the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt, includes:

When the reference signal selected for the Nth random access attempt is the same as that for the N-1th random access attempt, and the number of PRACH transmissions for the Nth random access attempt is the same as that for the N-1th random access attempt, a power climb is performed according to the first power climb step size and the PRACH transmit power of the N-1th random access attempt.

When the reference signal selected for the Nth random access attempt is different from the reference signal selected for the N-1th random access attempt, and/or the number of PRACH transmissions in the Nth random access attempt is different from the number of PRACH transmissions in the N-1th random access attempt, power ramping is not performed.

In some embodiments, the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1st random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1st random access attempt before the Nth random access attempt, comprises:

When there is at least one random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, performing a power ramp-up according to the first power ramp-up step size and the PRACH transmit power of the most recent random access attempt satisfying the first condition;

The reference signal selected by the random access attempt that meets the first condition is the same as the reference signal selected by the Nth random access attempt, and the number of PRACH transmissions of the random access attempt that meets the first condition is the same as the number of PRACH transmissions of the Nth random access attempt.

If there is no random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, no power ramping is performed;

In some embodiments, the first power ramp-up step is a fixed value; or,

The first power ramp step is determined according to the number of PRACH transmissions in the Nth random access attempt and a first mapping relationship between the power ramp step and the number of PRACH transmissions; or,

The first power ramp step is determined according to the number of PRACH transmissions of the Nth random access attempt and the reference signal selected for the Nth random access attempt, and a second mapping relationship between the power ramp step and the number of PRACH transmissions and the reference signal.

In some embodiments, the fixed value of the first power ramp step, the first mapping relationship, One or more items of the second mapping relationships are predefined by the protocol or indicated by the network device.

In some embodiments, the reference signal comprises a synchronization signal block SSB or a channel state information reference signal CSI-RS.

In a second aspect, an embodiment of the present disclosure further provides a method for controlling the transmission power of a physical random access channel (PRACH) in a random access process, which is applied to a network device, including:

Sending a first signaling, where the first signaling is used to indicate a power climbing step size to the terminal, where the power climbing step size is used by the terminal to determine a PRACH transmit power of a random access attempt;

The first signaling includes one or more of the following:

A fixed value for the first power ramp-up step length;

A first mapping relationship between a power ramp step size and a number of PRACH transmissions;

A second mapping relationship between the power ramp step size and the number of PRACH transmissions and the reference signal.

In a third aspect, an embodiment of the present disclosure further provides a terminal, including a memory, a transceiver, and a processor;

A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

Determining a PRACH transmit power for the Nth random access attempt based on a reference signal selected for the Nth random access attempt and a number of PRACH transmissions for the Nth random access attempt;

In some embodiments, the determining, based on the reference signal selected by the Nth random access attempt and the number of PRACH transmissions of the Nth random access attempt, the PRACH transmit power of the Nth random access attempt comprises:

Determine the number of PRACH transmissions corresponding to the Nth random access attempt and the N-1st random access attempt before the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1st random access attempt before the Nth random access attempt. The PRACH transmit power of the Nth random access attempt.

When there is at least one random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, performing a power ramp-up according to a first power ramp-up step size and a PRACH transmit power of a most recent random access attempt satisfying the first condition;

In some embodiments, the Nth random access attempt and the Nth random access attempt Determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the N-1 random access attempts before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1 random access attempts before the Nth random access attempt, comprising:

In some embodiments, the first power ramp-up step is a fixed value; or,

In some embodiments, one or more of the fixed value of the first power ramp step, the first mapping relationship, and the second mapping relationship are predefined by a protocol or indicated by a network device.

In a fourth aspect, an embodiment of the present disclosure further provides a network device, including a memory, a transceiver, and a processor;

Sending a first signaling, where the first signaling is used to indicate a power ramp step size to the terminal, where the power ramp step size is used by the terminal to determine a PRACH transmit power for a random access attempt;

The first signaling includes one or more of the following:

A fixed value for the first power ramp-up step length;

In a fifth aspect, an embodiment of the present disclosure further provides a device for controlling a physical random access channel PRACH transmission power in a random access process, including:

a determining unit, configured to determine a PRACH transmit power for the Nth random access attempt based on a reference signal selected for the Nth random access attempt and a number of PRACH transmissions for the Nth random access attempt;

In a sixth aspect, an embodiment of the present disclosure further provides a device for controlling a physical random access channel PRACH transmission power in a random access process, including:

A sending unit, configured to send a first signaling, where the first signaling is used to indicate a power climbing step size to the terminal, where the power climbing step size is used by the terminal to determine a PRACH transmit power of a random access attempt;

The first signaling includes one or more of the following:

A fixed value for the first power ramp-up step length;

In the seventh aspect, an embodiment of the present disclosure also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is used to enable a computer to execute the method for controlling the transmission power of a physical random access channel PRACH in the random access process as described in the first aspect, or to execute the method for controlling the transmission power of a physical random access channel PRACH in the random access process as described in the second aspect.

In an eighth aspect, an embodiment of the present disclosure further provides a communication device, in which a computer program is stored, and the computer program is used to enable the communication device to execute the method for controlling the transmission power of a physical random access channel PRACH in the random access process as described in the first aspect, or to execute the method for controlling the transmission power of a physical random access channel PRACH in the random access process as described in the second aspect.

In a ninth aspect, the present disclosure also provides a processor-readable storage medium, wherein the processor The readable storage medium stores a computer program, which is used to enable the processor to execute the method for controlling the transmission power of the physical random access channel PRACH in the random access process as described in the first aspect as described above, or to execute the method for controlling the transmission power of the physical random access channel PRACH in the random access process as described in the second aspect as described above.

In the tenth aspect, an embodiment of the present disclosure also provides a chip product, in which a computer program is stored, and the computer program is used to enable the chip product to execute the method for controlling the transmission power of the physical random access channel PRACH of the random access process as described in the first aspect, or to execute the method for controlling the transmission power of the physical random access channel PRACH of the random access process as described in the second aspect.

The method and device for controlling the PRACH transmission power in the random access process provided by the embodiments of the present disclosure enable the terminal to determine the PRACH transmission power of the Nth random access attempt based on the reference signal selected for the Nth random access attempt and the number of PRACH transmissions in the Nth random access attempt, thereby being able to increase the PRACH transmission power when multiple PRACHs are sent in one random access attempt, thereby increasing the success rate of random access and the flexibility of random access design.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a flow chart of a method for controlling PRACH transmission power in a random access process provided by an embodiment of the present disclosure;

FIG2 is a second flow chart of a method for controlling PRACH transmission power in a random access process provided by an embodiment of the present disclosure;

FIG3 is a schematic diagram of the structure of a terminal provided in an embodiment of the present disclosure;

FIG4 is a schematic diagram of the structure of a network device provided in an embodiment of the present disclosure;

FIG5 is a schematic diagram of a structure of a device for controlling PRACH transmission power in a random access process according to an embodiment of the present disclosure;

FIG6 is a second schematic diagram of the structure of the apparatus for controlling PRACH transmission power in a random access process provided by an embodiment of the present disclosure.

Detailed ways

In the embodiments of the present disclosure, the term "and/or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and/or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the associated objects before and after are in an "or" relationship.

The term "plurality" in the embodiments of the present disclosure refers to two or more than two, and other quantifiers are similar thereto.

The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

In order to facilitate a clearer understanding of the technical solutions of the embodiments of the present disclosure, some technical contents related to the embodiments of the present disclosure are first introduced.

In the design of random access in the NR system, the terminal first selects a reference signal that meets the access conditions (for example, the RSRP of the reference signal is greater than a threshold value) based on the measurement results of the reference signal received power (RSRP) of the reference signal (such as the synchronization signal block (SSB) or the channel state information reference signal (CSI-RS)), and sends PRACH in the random access channel transmission opportunity (RACH Occasion, RO) associated with the selected reference signal to initiate random access. Furthermore, when multiple PRACH transmissions are supported, the terminal determines the number of PRACH transmissions used for the current random access attempt based on the RSRP measurement results of the downlink path loss reference. If the random access fails and the maximum number of attempts in the random access process is not reached, the terminal will continue to initiate the next random access. Due to changes in the channel state, the terminal may re-measure the RSRP of all reference signals and select the reference signal again based on the new measurement results. Similarly, during the next random access attempt, the number of PRACH transmissions determined by the terminal to be adopted may also change.

When the terminal makes its first random attempt, it calculates the initial power of the PRACH transmission. When the initial random access fails and the second, third or even more random access attempts are made, the terminal can increase the transmit power based on the initial PRACH transmit power, that is, perform power ramping.

However, there is currently no power ramp-up mechanism for sending multiple PRACHs during a random access attempt, so it is impossible to increase the transmit power of PRACH when sending multiple PRACHs during a random access attempt, which limits the flexibility of random access design and cannot further improve the success rate of random access.

FIG. 1 is a flow chart of a method for controlling PRACH transmission power in a random access process provided by an embodiment of the present disclosure. The method can be applied to a terminal. As shown in FIG. 1 , the method includes the following steps:

Step 100: Determine the PRACH transmit power of the Nth random access attempt based on the reference signal selected for the Nth random access attempt and the number of PRACH transmissions for the Nth random access attempt; wherein N is an integer greater than 1, and the number of PRACH transmissions for the Nth random access attempt is greater than or equal to 1.

Specifically, in the disclosed embodiments, the terminal may consider factors such as the reference signal selected for this random access attempt and the number of PRACH transmissions in this random access attempt when determining the PRACH transmission power for each random access attempt (RA attempt), and determine whether to perform power ramping or how to perform power ramping in this random access attempt based on different situations of these factors, thereby increasing the PRACH transmission power when sending multiple PRACHs in one random access attempt, thereby improving the success rate of random access.

In some embodiments, the number of PRACH transmissions in any random access attempt may be greater than or equal to 1, such as 1, 2, 4, or 8, etc. The number of PRACHs sent in each random access attempt may not be the same.

In some embodiments, the number of PRACH transmissions in any random access attempt may be greater than 1, such as 2, 4, or 8, etc. The number of PRACHs sent in each random access attempt may not be the same.

In some embodiments, the reference signal may include an SSB or a CSI-RS. The reference signal selected for each random access attempt may not be the same.

The present disclosure provides a method for controlling the PRACH transmission power in a random access process, a terminal The PRACH transmission power of the Nth random access attempt can be determined based on the reference signal selected for the Nth random access attempt and the number of PRACH transmissions in the Nth random access attempt, so that the PRACH transmission power can be improved when multiple PRACHs are sent in one random access attempt, thereby improving the success rate of random access and improving the flexibility of random access design.

In some embodiments, determining the PRACH transmit power of the Nth random access attempt based on the reference signal selected for the Nth random access attempt and the number of PRACH transmissions of the Nth random access attempt includes any of the following:

(1) Determine the PRACH transmit power of the Nth random access attempt based on the reference signals selected for the Nth random access attempt and the N-1th random access attempt, respectively, and the number of PRACH transmissions corresponding to the Nth random access attempt and the N-1th random access attempt, respectively.

Specifically, in the embodiment of the present disclosure, when determining the PRACH transmit power of the Nth random access attempt, the terminal can first determine the reference signals selected for the Nth random access attempt and the N-1th random access attempt, respectively, and the number of PRACH transmissions corresponding to the Nth random access attempt and the N-1th random access attempt, respectively, and based on the current and previous random access attempts, determine whether to perform power climbing for this random access attempt, or how to perform power climbing, etc.

In some embodiments, determining the PRACH transmit power of the Nth random access attempt based on reference signals respectively selected for the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt, includes:

In one implementation, if the reference signal selected for the Nth random access attempt is the same as the reference signal selected for the N-1th random access attempt (for example, the reference signals are both SSB numbered 0, referred to as SSB#0), and the number of PRACH transmissions for the Nth random access attempt is the same as the number of PRACH transmissions for the N-1th random access attempt (for example, the number of PRACH transmissions is equal to 2), in this case, the terminal may perform a power ramp-up based on the PRACH transmit power of the N-1th random access attempt. The step size for performing power climbing is the first power climbing step size, and the PRACH transmit power of the Nth random access attempt may be equal to the sum of the PRACH transmit power of the N-1th random access attempt and the first power climbing step size.

In some embodiments, the first power climbing step size may be a fixed value; or, the first power climbing step size may be determined based on the number of PRACH transmissions in the Nth random access attempt, and a first mapping relationship between the power climbing step size and the number of PRACH transmissions; or, the first power climbing step size may be determined based on the number of PRACH transmissions in the Nth random access attempt and the reference signal selected for the Nth random access attempt, and a second mapping relationship between the power climbing step size and the number of PRACH transmissions and the reference signal.

For example, the first power ramp-up step length may be a fixed step length, and the fixed step length is used each time the power ramp-up is performed.

For example, a first mapping relationship between the power climbing step size and the number of PRACH transmissions can be set, that is, different numbers of PRACH transmissions correspond to different power climbing step sizes. For example, assuming that when the number of PRACH transmissions is 1, the corresponding power climbing step size is p1; when the number of PRACH transmissions is 2, the corresponding power climbing step size is p2; when the number of PRACH transmissions is 4, the corresponding power climbing step size is p3; when the number of PRACH transmissions is 8, the corresponding power climbing step size is p4, then if the number of PRACH transmissions in the Nth random access attempt is 2, it can be determined that the first power climbing step size corresponding to the Nth random access attempt is p2.

For example, a second mapping relationship between the power climbing step size and the number of PRACH transmissions and the reference signal can be set, that is, different PRACH transmission numbers and reference signal combinations correspond to different power climbing step sizes. For example, assuming that the number of PRACH transmissions is 2 and the reference signal is SSB#0, the corresponding power climbing step size is p5; the number of PRACH transmissions is 2 and the reference signal is SSB#1, the corresponding power climbing step size is p6; the number of PRACH transmissions is 4 and the reference signal is SSB#1, the corresponding power climbing step size is p7; then if the number of PRACH transmissions for the Nth random access attempt is 2 and the reference signal selected for the Nth random access attempt is SSB#0, it can be determined that the first power climbing step size corresponding to the Nth random access attempt is p5.

In some embodiments, one or more of the fixed value of the first power ramp step, the first mapping relationship, and the second mapping relationship may be predefined by the protocol or indicated by a network device (eg, a base station). of.

In some embodiments, the network device may indicate one or more of the following through the first signaling:

A fixed value for the first power ramp-up step length;

In some embodiments, the first signaling can be a semi-static radio resource control (Radio Resource Control, RRC) signaling configured by a high layer, system information block 1 (System Information Block 1, SIB1) information or other dynamic signaling, and the specific circumstances are not limited.

In one implementation manner, when it is determined that the reference signal selected for the Nth random access attempt is different from that selected for the N-1th random access attempt, or the number of PRACH transmissions for the Nth random access attempt is different from that for the N-1th random access attempt, or both the reference signal and the number of PRACH transmissions corresponding to the Nth random access attempt and the N-1th random access attempt are different, the terminal may not perform power climbing, and the PRACH transmit power of the Nth random access attempt may be equal to the PRACH transmit power of the N-1th random access attempt.

(2) Determine the PRACH transmit power of the Nth random access attempt based on the reference signals selected for the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, respectively, and the number of PRACH transmissions corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, respectively.

Specifically, in the embodiment of the present disclosure, when determining the PRACH transmit power of the Nth random access attempt, the terminal may first determine the reference signals respectively selected by the Nth random access attempt and the N-1st random access attempt before the Nth random access attempt, and the reference signals respectively selected by the Nth random access attempt and the Nth random access attempt. The number of PRACH transmissions corresponding to the N-1 random access attempts before the random access attempt is used to determine whether to perform power climbing in this random access attempt, or how to perform power climbing, etc. based on the current and previous random access attempts.

In some embodiments, determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, includes:

The reference signal selected for the random access attempt that meets the first condition is the same as the reference signal selected for the Nth random access attempt, and the number of PRACH transmissions for the random access attempt that meets the first condition is the same as the number of PRACH transmissions for the Nth random access attempt.

In one implementation, if there is at least one random access attempt that meets the first condition in the N-1 random access attempts before the Nth random access attempt, in this case, the terminal may perform a power climb based on the PRACH transmit power of the most recent random access attempt that meets the first condition, and the step length of the power climb is the first power climb step length. Then, the PRACH transmit power of the Nth random access attempt may be equal to the sum of the PRACH transmit power of the most recent random access attempt that meets the first condition and the first power climb step length.

Among them, the random access attempt that meets the first condition refers to a random access attempt in which the reference signal and the number of PRACH transmissions are the same as those of the Nth random access attempt. For example, the reference signal corresponding to the Nth random access attempt is SSB#0, and the number of PRACH transmissions is 2, the reference signal corresponding to the N-1th random access attempt is SSB#1, and the number of PRACH transmissions is 2, the reference signal corresponding to the N-2th random access attempt is SSB#0, and the number of PRACH transmissions is 4, and the reference signal corresponding to the N-3rd random access attempt is SSB#0, and the number of PRACH transmissions is 2, then the N-3rd random access attempt is the most recent random access attempt that meets the first condition.

In some embodiments, the first power ramp step size may be a fixed value; or, the first power ramp step size may be based on the number of PRACH transmissions in the Nth random access attempt and the power ramp step size. The first power climbing step size is determined by a first mapping relationship between the power climbing step size and the number of PRACH transmissions; or, the first power climbing step size is determined according to the number of PRACH transmissions of the Nth random access attempt and the reference signal selected for the Nth random access attempt, and a second mapping relationship between the power climbing step size and the number of PRACH transmissions and the reference signal.

In some embodiments, one or more of the fixed value of the first power ramp step, the first mapping relationship, and the second mapping relationship may be predefined by a protocol or indicated by a network device.

If there is no random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, power ramping is not performed;

In one implementation, if there is no random access attempt that satisfies the first condition in the N-1 random access attempts before the N-th random access attempt, the N-th random access attempt does not perform power ramping, and the PRACH transmit power of the N-th random access attempt may be equal to the PRACH transmit power of the N-1-th random access attempt.

For example, assuming that the Nth random access attempt is the third random access attempt, the reference signal corresponding to the third random access attempt is SSB#0, and the number of PRACH transmissions is 8, the reference signal corresponding to the second random access attempt is SSB#0, and the number of PRACH transmissions is 4, and the reference signal corresponding to the first random access attempt is SSB#1, and the number of PRACH transmissions is 2. It can be seen that the reference signal and the number of PRACH transmissions corresponding to the two random access attempts before the third random access attempt are different from the reference signal and the number of PRACH transmissions corresponding to the third random access attempt. The terminal cannot find a random access attempt that meets the first condition, so the third random access attempt may not perform power climbing.

FIG. 2 is a method for controlling the PRACH transmission power in a random access process provided by an embodiment of the present disclosure. The second flow chart of the method can be applied to a network device (such as a base station), as shown in FIG2 , and the method includes the following steps:

Step 200: Send a first signaling, where the first signaling is used to indicate a power ramp step length to the terminal, where the power ramp step length is used by the terminal to determine a PRACH transmit power for a random access attempt;

The first signaling includes one or more of the following:

A fixed value for the first power ramp-up step length;

When the terminal performs power climbing, the power climbing step length (such as the first power climbing step length) used for the power climbing may be indicated by the network device.

A fixed value for the first power ramp-up step length;

The first signaling may be semi-static RRC signaling configured by a high layer, SIB1 information or other dynamic signaling, and the specific circumstances are not limited.

In some embodiments, the first power climbing step size may be a fixed value; or, the first power climbing step size corresponding to the Nth random access attempt may be determined based on the number of PRACH transmissions of the Nth random access attempt, and the first mapping relationship between the power climbing step size and the number of PRACH transmissions; or, the first power climbing step size corresponding to the Nth random access attempt may be determined based on the number of PRACH transmissions of the Nth random access attempt and the reference signal selected for the Nth random access attempt, and the second mapping relationship between the power climbing step size and the number of PRACH transmissions and the reference signal. , N is an integer greater than 1.

The method for controlling the PRACH transmission power in the random access process provided by the embodiment of the present disclosure can enable the network device to indicate to the terminal the power climbing step size for determining the PRACH transmission power of the Nth random access attempt, so that the terminal can also increase the PRACH transmission power when sending multiple PRACHs in one random access attempt, thereby improving the success rate of random access and enhancing the flexibility of random access design.

The methods provided in the various embodiments of the present disclosure are based on the same application concept, so the implementation of each method can refer to each other, and the repeated parts will not be repeated.

The methods provided in the above embodiments of the present disclosure are illustrated below by using embodiments of specific application scenarios.

Embodiment 1:

In this embodiment, it is assumed that the terminal transmits two PRACHs on two ROs associated with SSB#0, and the PRACH transmission power corresponding to this RA attempt is P1. However, the terminal fails to access the cell in this attempt, and the terminal subsequently initiates another RA attempt. The second RA attempt is the current RA attempt, and the terminal transmits M PRACHs on M ROs associated with SSB#A.

If SSB#A is SSB#0 and M=2, that is, the reference signal used by the current RA attempt and the number of PRACHs transmitted are the same as the reference signal used and the number of PRACHs transmitted in the previous RA attempt, the terminal accumulates a power ramp on the PRACH transmit power P1 corresponding to the previous RA attempt. For example, the counting parameter PREAMBLE_POWER_RAMPING_COUNTER corresponding to the power ramp is increased by 1. At this time, the PRACH transmit power corresponding to the current RA attempt is "P1+power ramping step". The power ramping step may be a fixed value, or a value corresponding to the current PRACH transmission number level M=2, or a value corresponding to the current reference signal SSB#0+current PRACH transmission number level M=2, which is not limited in this embodiment. The fixed value or the value corresponding to different PRACH transmission number levels may be predefined by the terminal and the network side through a protocol, or notified to the terminal by the network side through signaling, and the signaling may be semi-static RRC signaling configured by a high layer, SIB1 information or other dynamic signaling.

If SSB#A is SSB#1 and M=2, that is, the reference signal used by the current RA attempt is different from the reference signal used in the previous RA attempt, the current RA attempt does not perform power ramping.

If SSB#A is SSB#0 and M=4, that is, the number of PRACHs transmitted in the current RA attempt is different from the number of PRACHs transmitted in the previous RA attempt, the current RA attempt does not perform power ramping.

If SSB#A is SSB#1 and M=4, that is, the reference signal used by the current RA attempt and the number of PRACHs transmitted are different from the reference signal used and the number of PRACHs transmitted in the previous RA attempt, then the current RA attempt does not perform power ramping.

Embodiment 2:

In this embodiment, it is assumed that the terminal initially accesses and transmits 4 PRACHs on 4 ROs associated with SSB#0, and the PRACH transmission power corresponding to this RA attempt is P1. However, the terminal fails to access the cell in this attempt, and then initiates another RA attempt. The second RA attempt ends The terminal transmits two PRACHs on two ROs associated with SSB#1, and the PRACH transmission power corresponding to the second RA attempt is P2. Similarly, the terminal still fails to successfully access the cell in the second attempt, and then initiates the third RA attempt. The third RA attempt is the current RA attempt, and the terminal transmits M PRACHs on M ROs associated with SSB#A.

If SSB#A is SSB#0 and M=4, that is, the reference signal used in the current RA attempt and the number of PRACH transmissions are the same as those used in the first RA attempt, the terminal can accumulate a power ramp on the PRACH transmission power P1 corresponding to the first RA attempt. For example, add 1 to the counting parameter PREAMBLE_POWER_RAMPING_COUNTER corresponding to the power ramping. At this time, the PRACH transmission power corresponding to the current RA attempt is "P1+power ramping step size".

If SSB#A is SSB#1 and M=2, that is, the reference signal used in the current RA attempt and the number of PRACH transmissions are the same as the reference signal used in the last, i.e., the second, RA attempt and the number of PRACH transmissions, the terminal can accumulate a power ramp on the PRACH transmission power P2 corresponding to the last, i.e., the second RA attempt. For example, add 1 to the counting parameter PREAMBLE_POWER_RAMPING_COUNTER corresponding to the power ramping. At this time, the PRACH transmission power corresponding to the current RA attempt is "P2 + power ramping step size".

In the above two cases, the power ramp step may be a fixed value, or a value corresponding to the current PRACH transmission quantity level M=4/M=2, or a value corresponding to the current reference signal SSB#0+current PRACH transmission quantity level M=4/current reference signal SSB#1+current PRACH transmission quantity level M=2, which is not limited in this embodiment. The fixed value or the values corresponding to different levels may be predefined by the terminal and the network side through a protocol, or notified to the terminal by the network side through signaling, and the signaling may be semi-static RRC signaling configured by a high layer, SIB1 information, or other dynamic signaling.

If SSB#A is SSB#0 and M=2, that is, the terminal cannot find a RA attempt in the current random access process that uses the same reference signal and the same number of PRACHs transmitted as the current RA attempt, then the current RA attempt does not perform power ramping.

Similarly, if SSB#A is SSB#1 and M=4, or SSB#A is SSB#2 and M=2, or SSB#A is SSB#2 and M=4, the current RA attempt does not perform power ramping.

It should be noted that in all the above embodiments, the terminal performs power ramping based on the premise that the terminal does not switch the transmission beam. If the terminal switches the transmission beam, that is, changes the filter of the transmitting end, the terminal does not perform power ramping.

The methods and devices provided in the various embodiments of the present disclosure are based on the same application concept. Since the methods and devices solve problems based on similar principles, the implementation of the devices and methods can refer to each other, and the repeated parts will not be repeated.

FIG3 is a schematic diagram of the structure of a terminal provided in an embodiment of the present disclosure. As shown in FIG3 , the terminal includes a memory 320 , a transceiver 310 , and a processor 300 ; wherein the processor 300 and the memory 320 may also be arranged physically separately.

The memory 320 is used to store computer programs; the transceiver 310 is used to send and receive data under the control of the processor 300.

Specifically, the transceiver 310 is used to receive and send data under the control of the processor 300 .

Among them, in Figure 3, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 300 and various circuits of memory represented by memory 320 are linked together. The bus architecture can also link various other circuits such as peripherals, regulators, and power management circuits together, which are all well known in the art, and therefore, the present disclosure will not further describe them. The bus interface provides an interface. The transceiver 310 can be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, and these transmission media include transmission media such as wireless channels, wired channels, and optical cables. For different user devices, the user interface 330 can also be an interface that can be connected to external and internal devices, and the connected devices include but are not limited to keypads, displays, speakers, microphones, joysticks, etc.

The processor 300 is responsible for managing the bus architecture and general processing, and the memory 320 can store data used by the processor 300 when performing operations.

The processor 300 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (CPLD). The processor can also adopt a multi-core architecture.

The processor 300 calls the computer program stored in the memory 320 to obtain the The execution instruction executes any of the methods provided by the embodiments of the present disclosure, for example: determining the PRACH transmit power of the Nth random access attempt based on the reference signal selected for the Nth random access attempt and the number of PRACH transmissions for the Nth random access attempt; wherein N is an integer greater than 1, and the number of PRACH transmissions for the Nth random access attempt is greater than or equal to 1.

In some embodiments, determining a PRACH transmit power for the Nth random access attempt based on a reference signal selected for the Nth random access attempt and a number of PRACH transmissions for the Nth random access attempt includes:

Determine the PRACH transmit power of the Nth random access attempt based on the reference signals selected for the Nth random access attempt and the N-1th random access attempt, respectively, and the number of PRACH transmissions corresponding to the Nth random access attempt and the N-1th random access attempt, respectively; or,

The PRACH transmit power of the Nth random access attempt is determined based on the reference signals respectively selected for the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt.

The reference signal selected in the Nth random access attempt is different from the reference signal selected in the N-1th random access attempt, and/or the number of PRACH transmissions in the Nth random access attempt is different from that in the N-1th random access attempt. When the number of PRACH transmissions to be tested is different, no power ramping is performed.

In some embodiments, the first power ramp-up step is a fixed value; or,

The first power ramp step is determined according to the number of PRACH transmissions in the Nth random access attempt and the reference signal selected in the Nth random access attempt, and a second mapping relationship between the power ramp step and the number of PRACH transmissions and the reference signal.

In some embodiments, one or more of the fixed value of the first power ramp step, the first mapping relationship, and the second mapping relationship are predefined by the protocol or indicated by the network device.

FIG4 is a schematic diagram of the structure of a network device provided in an embodiment of the present disclosure. As shown in FIG4 , the network device includes a memory 420 , a transceiver 410 , and a processor 400 ; wherein the processor 400 and the memory 420 may also be arranged physically separately.

The memory 420 is used to store computer programs; the transceiver 410 is used to send and receive data under the control of the processor 400.

Specifically, the transceiver 410 is used to receive and send data under the control of the processor 400 .

In FIG. 4 , the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 400 and various circuits of memory represented by memory 420 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described in this disclosure. The bus interface provides an interface. The transceiver 410 may be a plurality of components, including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, which may include a wireless channel, a wired channel, an optical cable, and other transmission media.

The processor 400 is responsible for managing the bus architecture and general processing, and the memory 420 can store data used by the processor 400 when performing operations.

The processor 400 may be a CPU, an ASIC, an FPGA or a CPLD, and the processor may also adopt a multi-core architecture.

The processor 400 is configured to execute any of the methods provided in the embodiments of the present disclosure according to the obtained executable instructions by calling the computer program stored in the memory 420, for example: sending a first signaling, where the first signaling is used to indicate a power climbing step size to the terminal, where the power climbing step size is used by the terminal to determine the PRACH transmit power of the random access attempt;

The first signaling includes one or more of the following:

A fixed value for the first power ramp-up step length;

It should be noted that the above-mentioned terminal and network device provided in the embodiments of the present disclosure can realize All the method steps implemented in the above method embodiment are now described, and the same technical effects can be achieved. The parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

FIG. 5 is a schematic diagram of a structure of a device for controlling PRACH transmission power in a random access process provided by an embodiment of the present disclosure. As shown in FIG. 5 , the device includes:

A determining unit 500, configured to determine a PRACH transmit power for the Nth random access attempt based on a reference signal selected for the Nth random access attempt and a number of PRACH transmissions for the Nth random access attempt;

In some embodiments, based on the Nth random access attempt and the N-1th random access attempt, The method further comprises: determining a PRACH transmit power for the Nth random access attempt based on a reference signal selected separately and the number of PRACH transmissions corresponding to the Nth random access attempt and the N-1th random access attempt respectively, comprising:

In some embodiments, the first power ramp-up step is a fixed value; or,

FIG6 is a second structural diagram of a device for controlling PRACH transmission power in a random access process provided by an embodiment of the present disclosure. As shown in FIG6 , the device includes:

A sending unit 600 is configured to send a first signaling, where the first signaling is used to indicate a power ramp step length to the terminal, where the power ramp step length is used by the terminal to determine a PRACH transmit power for a random access attempt;

The first signaling includes one or more of the following:

A fixed value for the first power ramp-up step length;

It should be noted that the division of units in the embodiments of the present disclosure is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional unit in each embodiment of the present disclosure may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present disclosure can essentially or partly contribute to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present disclosure. The aforementioned storage media include: USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (Random Access Memory, RAM), magnetic disks, or optical disks, etc.

It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

On the other hand, an embodiment of the present disclosure further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is used to enable a computer to execute the method for controlling the PRACH transmission power of the random access process provided in the above embodiments.

It should be noted here that the computer-readable storage medium provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

The computer-readable storage medium can be any available medium or data storage device that can be accessed by a computer, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (such as CD, DVD, BD, HVD, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)), etc.

The technical solution provided by the embodiments of the present disclosure can be applicable to a variety of systems, especially 5G systems. For example, the applicable systems can be global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) general packet radio service (GPRS) system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, long term evolution advanced (LTE-A) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G new radio (NR) system, etc. These various systems all include terminal equipment and network equipment. The system can also include core network parts, such as the Evolved Packet System (EPS), 5G system (5GS), etc.

The terminal involved in the embodiments of the present disclosure may be a terminal that provides voice and/or data connectivity to a user. Device, a handheld device with wireless connection function, or other processing equipment connected to a wireless modem, etc. In different systems, the name of the terminal may also be different. For example, in a 5G system, the terminal may be called a user equipment (UE). A wireless terminal device can communicate with one or more core networks (CN) via a radio access network (RAN). A wireless terminal device can be a mobile terminal device, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal device. For example, it can be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device that exchanges language and/or data with a wireless access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs) and other devices. The wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal device, an access terminal device, a user terminal device, a user agent, and a user device, but is not limited in the embodiments of the present disclosure.

The network device involved in the embodiments of the present disclosure may be a base station, which may include multiple cells providing services for the terminal. Depending on the specific application scenario, the base station may also be called an access point, or may be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device may be used to interchange received air frames with Internet Protocol (IP) packets, and serve as a router between the wireless terminal device and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of the present disclosure may be a network device (Base Transceiver Station, BTS) in the Global System for Mobile communications (Global System for Mobile communications, GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or an evolutionary network device (evolutional Node B, eNB or e-NodeB) in the long term evolution (long term evolution, LTE) system, or a 5G base station in the 5G network architecture (next generation system). (gNB), may also be a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., which is not limited in the embodiments of the present disclosure. In some network structures, the network equipment may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be arranged geographically separately.

Network devices and terminals can each use one or more antennas for multiple input multiple output (MIMO) transmission. MIMO transmission can be single user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO). Depending on the form and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, or it can be diversity transmission, precoded transmission or beamforming transmission, etc.

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 computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program codes.

The present disclosure is described with reference to the flowchart and/or block diagram of the method, device (system), and computer program product according to the embodiment 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 process and/or box in the flowchart and/or block diagram can be implemented by computer executable instructions. These computer executable 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 produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one process or multiple processes in the flowchart and/or one box or multiple boxes in the block diagram.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.

Obviously, those skilled in the art can make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

A method for controlling the transmission power of a physical random access channel (PRACH) in a random access process, applied to a terminal, comprising:

Determining a PRACH transmit power for the Nth random access attempt based on a reference signal selected for the Nth random access attempt and a number of PRACH transmissions for the Nth random access attempt;

Wherein, N is an integer greater than 1, and the number of PRACH transmissions in the Nth random access attempt is greater than or equal to 1.
The method for controlling PRACH transmit power in a random access process according to claim 1, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signal selected by the Nth random access attempt and the number of PRACH transmissions of the Nth random access attempt comprises:

Determine the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected for the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt; or,

Determine the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected for the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt.
The method for controlling PRACH transmit power in a random access process according to claim 2, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt, comprises:

When the reference signal selected for the Nth random access attempt is the same as that for the N-1th random access attempt, and the number of PRACH transmissions for the Nth random access attempt is the same as that for the N-1th random access attempt, a power climb is performed according to the first power climb step size and the PRACH transmit power of the N-1th random access attempt.
The method for controlling the PRACH transmission power in the random access process according to claim 2, The determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt, includes:

When the reference signal selected for the Nth random access attempt is different from the reference signal selected for the N-1th random access attempt, and/or the number of PRACH transmissions in the Nth random access attempt is different from the number of PRACH transmissions in the N-1th random access attempt, power ramping is not performed.
The method for controlling PRACH transmit power in a random access process according to claim 2, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, comprises:

When there is at least one random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, performing a power ramp-up according to a first power ramp-up step size and a PRACH transmit power of a most recent random access attempt satisfying the first condition;

The reference signal selected by the random access attempt that meets the first condition is the same as the reference signal selected by the Nth random access attempt, and the number of PRACH transmissions of the random access attempt that meets the first condition is the same as the number of PRACH transmissions of the Nth random access attempt.
The method for controlling PRACH transmit power in a random access process according to claim 2, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, comprises:

If there is no random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, no power ramping is performed;

The reference signal selected by the random access attempt that meets the first condition is the same as the reference signal selected by the Nth random access attempt, and the number of PRACH transmissions of the random access attempt that meets the first condition is the same as the number of PRACH transmissions of the Nth random access attempt.
The method for controlling the PRACH transmit power in a random access process according to claim 3 or 5, wherein the first power ramp step is a fixed value; or

The first power ramp step is determined according to the number of PRACH transmissions in the Nth random access attempt and a first mapping relationship between the power ramp step and the number of PRACH transmissions; or,

The first power ramp step is determined according to the number of PRACH transmissions of the Nth random access attempt and the reference signal selected for the Nth random access attempt, and a second mapping relationship between the power ramp step and the number of PRACH transmissions and the reference signal.
The method for controlling the PRACH transmit power in the random access process according to claim 7, wherein one or more of the fixed value of the first power climbing step, the first mapping relationship, and the second mapping relationship are predefined by the protocol or indicated by the network device.
The method for controlling the PRACH transmission power in the random access process according to any one of claims 1 to 8, wherein the reference signal includes a synchronization signal block SSB or a channel state information reference signal CSI-RS.
A method for controlling the transmission power of a physical random access channel (PRACH) in a random access process, applied to a network device, comprising:

Sending a first signaling, where the first signaling is used to indicate a power ramp step size to the terminal, where the power ramp step size is used by the terminal to determine a PRACH transmit power for a random access attempt;

The first signaling includes one or more of the following:

A fixed value for the first power ramp-up step length;

A first mapping relationship between a power ramp step size and a number of PRACH transmissions;

A second mapping relationship between the power ramp step size and the number of PRACH transmissions and the reference signal.
A terminal comprises a memory, a transceiver, and a processor;

A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

Determining a PRACH transmit power for the Nth random access attempt based on a reference signal selected for the Nth random access attempt and a number of physical random access channel (PRACH) transmissions for the Nth random access attempt;

Wherein, N is an integer greater than 1, and the PRACH transmission of the Nth random access attempt is The input quantity is greater than or equal to 1.
The terminal according to claim 11, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signal selected by the Nth random access attempt and the number of PRACH transmissions of the Nth random access attempt comprises:

Determine the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected for the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt; or,

Determine the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected for the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt.
The terminal according to claim 12, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt comprises:

When the reference signal selected for the Nth random access attempt is the same as that for the N-1th random access attempt, and the number of PRACH transmissions for the Nth random access attempt is the same as that for the N-1th random access attempt, a power climb is performed according to the first power climb step size and the PRACH transmit power of the N-1th random access attempt.
The terminal according to claim 12, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt comprises:

When the reference signal selected for the Nth random access attempt is different from the reference signal selected for the N-1th random access attempt, and/or the number of PRACH transmissions in the Nth random access attempt is different from the number of PRACH transmissions in the N-1th random access attempt, power ramping is not performed.
The terminal according to claim 12, wherein the reference signal selected based on the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt is number, and the number of PRACH transmissions corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, respectively, to determine the PRACH transmit power of the Nth random access attempt, comprising:

When there is at least one random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, performing a power ramp-up according to a first power ramp-up step size and a PRACH transmit power of a most recent random access attempt satisfying the first condition;

The reference signal selected by the random access attempt that meets the first condition is the same as the reference signal selected by the Nth random access attempt, and the number of PRACH transmissions of the random access attempt that meets the first condition is the same as the number of PRACH transmissions of the Nth random access attempt.
The terminal according to claim 12, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, comprises:

If there is no random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, no power ramping is performed;

The reference signal selected by the random access attempt that meets the first condition is the same as the reference signal selected by the Nth random access attempt, and the number of PRACH transmissions of the random access attempt that meets the first condition is the same as the number of PRACH transmissions of the Nth random access attempt.
The terminal according to claim 13 or 15, wherein the first power climbing step is a fixed value; or

The first power ramp step is determined according to the number of PRACH transmissions in the Nth random access attempt and a first mapping relationship between the power ramp step and the number of PRACH transmissions; or,

The first power ramp step is determined according to the number of PRACH transmissions of the Nth random access attempt and the reference signal selected for the Nth random access attempt, and a second mapping relationship between the power ramp step and the number of PRACH transmissions and the reference signal.
The terminal according to claim 17, wherein one or more of the fixed value of the first power ramp step, the first mapping relationship, and the second mapping relationship are predefined by the protocol. or as indicated by a network device.
The terminal according to any one of claims 11 to 18, wherein the reference signal comprises a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS).
A network device, comprising a memory, a transceiver, and a processor;

A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

Sending a first signaling, where the first signaling is used to indicate a power climbing step size to the terminal, where the power climbing step size is used by the terminal to determine a physical random access channel PRACH transmit power of a random access attempt;

The first signaling includes one or more of the following:

A fixed value for the first power ramp-up step length;

A first mapping relationship between a power ramp step size and a number of PRACH transmissions;

A second mapping relationship between the power ramp step size and the number of PRACH transmissions and the reference signal.
A device for controlling the transmission power of a physical random access channel (PRACH) in a random access process, comprising:

a determining unit, configured to determine a PRACH transmit power of the Nth random access attempt based on a reference signal selected for the Nth random access attempt and a number of PRACH transmissions of the Nth random access attempt;

Wherein, N is an integer greater than 1, and the number of PRACH transmissions in the Nth random access attempt is greater than or equal to 1.
The device for controlling PRACH transmit power in a random access process according to claim 21, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signal selected by the Nth random access attempt and the number of PRACH transmissions of the Nth random access attempt comprises:

Determine the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected for the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt; or,

Based on the Nth random access attempt and the N-1 random access attempts before the Nth random access attempt The PRACH transmit power of the Nth random access attempt is determined based on the reference signals respectively selected for the access attempts and the numbers of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempts before the Nth random access attempt.
The device for controlling PRACH transmit power in a random access process according to claim 22, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt, comprises:

When the reference signal selected for the Nth random access attempt is the same as that for the N-1th random access attempt, and the number of PRACH transmissions for the Nth random access attempt is the same as that for the N-1th random access attempt, a power climb is performed according to the first power climb step size and the PRACH transmit power of the N-1th random access attempt.
The device for controlling PRACH transmit power in a random access process according to claim 22, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt, comprises:

When the reference signal selected for the Nth random access attempt is different from the reference signal selected for the N-1th random access attempt, and/or the number of PRACH transmissions in the Nth random access attempt is different from the number of PRACH transmissions in the N-1th random access attempt, power ramping is not performed.
The device for controlling PRACH transmit power in a random access process according to claim 22, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, comprises:

When there is at least one random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, performing a power ramp-up according to a first power ramp-up step size and a PRACH transmit power of a most recent random access attempt satisfying the first condition;

The reference signal selected by the random access attempt that meets the first condition is the same as the reference signal selected by the Nth random access attempt, and the number of PRACH transmissions of the random access attempt that meets the first condition is the same as the number of PRACH transmissions of the Nth random access attempt.
The device for controlling PRACH transmit power in a random access process according to claim 22, wherein the determining the PRACH transmit power of the Nth random access attempt based on the reference signals respectively selected in the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, and the number of PRACH transmissions respectively corresponding to the Nth random access attempt and the N-1th random access attempt before the Nth random access attempt, comprises:

If there is no random access attempt satisfying the first condition in the N-1 random access attempts before the Nth random access attempt, no power ramping is performed;

The reference signal selected by the random access attempt that meets the first condition is the same as the reference signal selected by the Nth random access attempt, and the number of PRACH transmissions of the random access attempt that meets the first condition is the same as the number of PRACH transmissions of the Nth random access attempt.
The device for controlling the PRACH transmit power in a random access process according to claim 23 or 25, wherein the first power ramp-up step is a fixed value; or

The first power ramp step is determined according to the number of PRACH transmissions in the Nth random access attempt and a first mapping relationship between the power ramp step and the number of PRACH transmissions; or,

The first power ramp step is determined according to the number of PRACH transmissions of the Nth random access attempt and the reference signal selected for the Nth random access attempt, and a second mapping relationship between the power ramp step and the number of PRACH transmissions and the reference signal.
The device for controlling the PRACH transmit power in the random access process according to claim 27, wherein one or more of the fixed value of the first power climbing step, the first mapping relationship, and the second mapping relationship are predefined by the protocol or indicated by the network device.
The device for controlling the PRACH transmission power in a random access process according to any one of claims 21 to 28, wherein the reference signal comprises a synchronization signal block SSB or a channel state information reference signal CSI-RS.
A device for controlling the transmission power of a physical random access channel (PRACH) in a random access process, comprising:

A sending unit, configured to send a first signaling, where the first signaling is used to indicate a power climbing step size to the terminal, where the power climbing step size is used by the terminal to determine a PRACH transmit power of a random access attempt;

The first signaling includes one or more of the following:

A fixed value for the first power ramp-up step length;

A first mapping relationship between a power ramp step size and a number of PRACH transmissions;

A second mapping relationship between the power ramp step size and the number of PRACH transmissions and the reference signal.
A computer-readable storage medium storing a computer program, wherein the computer program is used to cause a computer to execute the method according to any one of claims 1 to 9, or to execute the method according to claim 10.