CN117998558A

CN117998558A - Method and device for controlling PRACH (physical random Access channel) transmission power in random access process

Info

Publication number: CN117998558A
Application number: CN202211379127.XA
Authority: CN
Inventors: 沈姝伶; 邢艳萍; 高雪娟; 司倩倩
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2024-05-07
Also published as: WO2024093639A1

Abstract

The embodiment of the application provides a method and a device for controlling PRACH (physical random Access channel) transmission power in a random access process, wherein the method comprises the following steps: the terminal determines PRACH transmission power of the Nth random access attempt based on the reference signal selected by the Nth random access attempt and the PRACH transmission quantity 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. Therefore, when a plurality of PRACH are transmitted in one random access attempt, the transmission power of the PRACH can be improved, the success rate of the random access is improved, and the flexibility of the random access design is improved.

Description

Method and device for controlling PRACH (physical random Access channel) transmission power in random access process

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for controlling PRACH transmission power in a random access process.

Background

For Random access design in a New Radio (NR) system, after a Random access attempt fails, a terminal may increase the probability of success of Random access by increasing the transmission power (also called power ramp) of a Physical Random access channel (Physical Random ACCESS CHANNEL, PRACH). Specifically, when the terminal performs random attempt for the first time, the initial power of PRACH transmission is calculated, and when the initial random access fails to perform random access attempts for the second, third or even more times, the terminal can raise the transmission power based on the initial transmission power of the PRACH.

In the prior art, only one PRACH is sent in one random access attempt process, so that a power climbing mechanism for sending a plurality of PRACH in one random access attempt process does not exist at present, so that the sending power of the PRACH cannot be improved when the PRACH is sent in one random access attempt, the flexibility of random access design is limited, and the success rate of random access cannot be further improved.

Disclosure of Invention

Aiming at the problems existing in the prior art, the embodiment of the application provides a method and a device for controlling PRACH (physical random access channel) transmission power in a random access process.

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

determining PRACH transmission power of an nth random access attempt based on the selected reference signal 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 in the nth random access attempt is greater than or equal to 1.

Optionally, the determining the PRACH transmission power of the nth random access attempt based on the reference signal selected by the nth random access attempt and the PRACH transmission number of the nth random access attempt includes:

Determining PRACH transmission power of the Nth random access attempt based on reference signals respectively selected by the Nth random access attempt and the N-1 th random access attempt and PRACH transmission numbers respectively corresponding to the Nth random access attempt and the N-1 th random access attempt; or alternatively

And determining PRACH transmitting power of the Nth random access attempt based on the reference signals respectively selected by the Nth random access attempt and the N-1 random access attempts before the Nth random access attempt and the PRACH transmission numbers respectively corresponding to the Nth random access attempt and the N-1 random access attempts before the Nth random access attempt.

Optionally, the determining the PRACH transmission power of the nth random access attempt based on the reference signals respectively selected by the nth random access attempt and the N-1 th random access attempt and the PRACH transmission numbers respectively corresponding to the nth random access attempt and the N-1 th random access attempt includes:

and performing one power ramp-up according to the first power ramp-up step length and the PRACH transmission power of the N-1 th random access attempt under the condition that the N-1 th random access attempt is the same as the reference signal selected by the N-1 th random access attempt and the PRACH transmission number of the N-1 th random access attempt is the same as the PRACH transmission number of the N-1 th random access attempt.

In the case that the nth random access attempt is different from the reference signal selected by the nth-1 random access attempt and/or the number of PRACH transmissions of the nth random access attempt is different from the number of PRACH transmissions of the nth-1 random access attempt, no power ramp-up is performed.

Optionally, the determining the PRACH transmission power of the nth random access attempt based on the reference signal respectively selected by the nth random access attempt and 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 includes:

Performing a power ramp-up according to a first power ramp-up step and PRACH transmission power of a random access attempt which most recently meets a first condition when at least one random access attempt which meets the first condition exists in N-1 random access attempts before the Nth random access attempt;

wherein the reference signal selected by the random access attempt satisfying 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 satisfying the first condition is the same as the number of PRACH transmissions of the nth random access attempt.

If no random access attempt meeting the first condition exists in N-1 random access attempts before the Nth random access attempt, not performing power climbing;

Optionally, the first power climbing step length is a fixed value; or alternatively

The first power climbing step length is determined according to the PRACH transmission number of the Nth random access attempt and a first mapping relation between the power climbing step length and the PRACH transmission number; or alternatively

The first power climbing step length is determined according to the PRACH transmission number of the Nth random access attempt and the reference signal selected by the Nth random access attempt, and a second mapping relation between the power climbing step length, the PRACH transmission number and the reference signal.

Optionally, one or more of the fixed value of the first power ramp-up step, the first mapping relation, and the second mapping relation is predefined by a protocol or indicated by a network device.

Optionally, the reference signal includes a synchronization signal block SSB or a channel state information reference signal CSI-RS.

In a second aspect, an embodiment of the present application further provides a method for controlling PRACH transmission power of a physical random access channel in a random access procedure, which is applied to a network device, and includes:

Transmitting a first signaling, wherein the first signaling is used for indicating a power climbing step length to a terminal, and the power climbing step length is used for determining PRACH transmitting power of a random access attempt by the terminal;

Wherein the first signaling includes one or more of the following:

A fixed value of the first power ramp step;

A first mapping relation between the power climbing step length and the PRACH transmission number;

and a second mapping relation between the power climbing step length and the PRACH transmission quantity and the reference signal.

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

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

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

Wherein the first signaling includes one or more of the following:

A fixed value of the first power ramp step;

In a fifth aspect, an embodiment of the present application further provides a device for controlling PRACH transmission power of a physical random access channel in a random access procedure, where the device is applied to a terminal, and the device includes:

A determining unit, configured to determine PRACH transmission power of an nth random access attempt based on a reference signal selected by the nth random access attempt and a PRACH transmission number of the nth random access attempt;

In a sixth aspect, an embodiment of the present application further provides a device for controlling PRACH transmission power of a physical random access channel in a random access procedure, which is applied to a network device, including:

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

Wherein the first signaling includes one or more of the following:

A fixed value of the first power ramp step;

In a seventh aspect, an embodiment of the present application further provides a computer readable storage medium, where a computer program is stored, where the computer program is configured to cause a computer to perform the method for controlling the PRACH transmission power of a physical random access channel in a random access procedure according to the first aspect, or perform the method for controlling the PRACH transmission power of a physical random access channel in a random access procedure according to the second aspect.

In an eighth aspect, an embodiment of the present application further provides a communication device, where a computer program is stored, where the computer program is configured to cause the communication device to perform a method for controlling a transmission power of a physical random access channel PRACH in a random access procedure as described in the first aspect, or perform a method for controlling a transmission power of a physical random access channel PRACH in a random access procedure as described in the second aspect.

In a ninth aspect, an embodiment of the present application further provides a processor readable storage medium, where a computer program is stored, where the computer program is configured to cause a processor to perform a method for controlling PRACH transmission power of a physical random access channel in a random access procedure according to the first aspect, or perform a method for controlling PRACH transmission power of a physical random access channel in a random access procedure according to the second aspect.

In a tenth aspect, an embodiment of the present application further provides a chip product, where a computer program is stored, where the computer program is configured to enable the chip product to perform the method for controlling the transmission power of the PRACH of the physical random access channel in the random access procedure described in the first aspect, or perform the method for controlling the transmission power of the PRACH of the physical random access channel in the random access procedure described in the second aspect.

According to the method and the device for controlling the PRACH transmission power in the random access process, the terminal can determine the PRACH transmission power of the Nth random access attempt based on the reference signal selected by the Nth random access attempt and the PRACH transmission quantity of the Nth random access attempt, so that the PRACH transmission power can be improved when a plurality of PRACH are transmitted in one random access attempt, the success rate of random access is improved, and the flexibility of random access design is improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following descriptions are some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

Fig. 1 is a flow chart of a method for controlling PRACH transmission power in a random access procedure according to an embodiment of the present application;

Fig. 2 is a second flowchart of a method for controlling PRACH transmission power in a random access procedure according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a network device according to an embodiment of the present application;

Fig. 5 is a schematic structural diagram of a control device for PRACH transmission power in a random access procedure according to an embodiment of the present application;

fig. 6 is a second schematic structural diagram of a control device for PRACH transmission power in a random access procedure according to an embodiment of the present application.

Detailed Description

In the embodiment of the application, the term "and/or" describes the association relation of the association objects, which means that three relations can exist, for example, a and/or B can be expressed as follows: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The term "plurality" in embodiments of the present application means two or more, and other adjectives are similar.

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In order to facilitate a clearer understanding of the technical solutions of the embodiments of the present application, some technical contents related to the embodiments of the present application will be first described.

For random access design in an NR system, a terminal first selects a reference signal (such as RSRP greater than a threshold) meeting an access condition based on reference signal received Power (REFERENCE SIGNAL RECEIVED Power, RSRP) measurements on a reference signal (such as a synchronization signal block (Synchronization Signal Block, SSB) or a channel state Information reference signal (CHANNEL STATE Information-REFERENCE SIGNAL, CSI-RS)), and transmits a PRACH in a random access channel transmission opportunity (RACH Occasion, RO) associated with the selected reference signal to initiate random access. Further, when supporting multiple PRACH transmissions, the terminal determines the number of PRACH transmissions adopted by the current random access attempt according to the RSRP measurement result of the downlink loss reference. If the random access fails and the maximum number of attempts of the random access procedure is not reached, the terminal will continue to initiate the next random access. Due to the channel state change, the terminal may re-perform RSRP measurements on all reference signals, and select the reference signals again based on the new measurement results. Similarly, the number of PRACH transmissions that the terminal determines to use may also change during the next random access attempt.

The terminal calculates the initial power of the PRACH transmission when it makes a random attempt for the first time. Only when the initial random access fails to perform the second, third or even more random access attempts, the terminal can boost the transmission power based on the PRACH initial transmission power, i.e. perform power ramp-up.

However, at present, there is no power climbing mechanism for transmitting a plurality of PRACH in one random access attempt, so that the transmission power of the PRACH cannot be improved when a plurality of PRACH is transmitted in one random access attempt, flexibility of random access design is limited, and success rate of random access cannot be further improved.

Fig. 1 is a flow chart of a method for controlling PRACH transmission power in a random access procedure according to an embodiment of the present application, where the method may be applied to a terminal, as shown in fig. 1, and the method includes the following steps:

Step 100, determining PRACH transmission 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; 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.

Specifically, in the embodiment of the application, when determining the PRACH transmission power of each random access attempt (RA ATTEMPT), the terminal can consider the reference signal selected by the random access attempt and the factors such as the number of PRACH transmissions of the random access attempt, and determine whether or how to perform power climbing according to different conditions of the factors, so that the transmission power of the PRACH can be improved when the random access attempt transmits a plurality of PRACHs at one time, and the success rate of the random access is improved.

Alternatively, the number of PRACH transmissions for any one random access attempt may be greater than or equal to 1, such as 1, 2, 4, or 8, etc. The number of PRACH transmitted per random access attempt is not necessarily the same.

Alternatively, the number of PRACH transmissions for any one random access attempt may be greater than 1, such as 2,4, or 8, etc. The number of PRACH transmitted per random access attempt is not necessarily the same.

Alternatively, the reference signal may include SSB or CSI-RS. The reference signal selected for each random access attempt is not necessarily the same.

According to the control method for the PRACH transmission power in the random access process, the terminal can determine the PRACH transmission power of the Nth random access attempt based on the reference signal selected by the Nth random access attempt and the PRACH transmission number of the Nth random access attempt, so that the PRACH transmission power can be improved when a plurality of PRACH are transmitted in one random access attempt, the success rate of random access is improved, and the flexibility of random access design is improved.

Optionally, determining the PRACH transmission 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, including any one of the following:

(1) And determining PRACH transmission power of the Nth random access attempt based on the reference signals respectively selected by the Nth random access attempt and the N-1 th random access attempt and the PRACH transmission numbers respectively corresponding to the Nth random access attempt and the N-1 th random access attempt.

Specifically, in the embodiment of the present application, when determining the PRACH transmission 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-1 th random access attempt, and the PRACH transmission numbers respectively corresponding to the nth random access attempt and the N-1 th random access attempt, and determine whether or how to perform power ramp-up in the current random access attempt, based on the current and last random access attempt conditions.

Optionally, determining the PRACH transmission power of the nth random access attempt based on the reference signals respectively selected by the nth random access attempt and the N-1 th random access attempt and the PRACH transmission numbers respectively corresponding to the nth random access attempt and the N-1 th random access attempt includes:

In one embodiment, if the nth random access attempt is the same as the reference signal selected by the nth-1 random access attempt (for example, the reference signals are SSBs numbered 0, abbreviated as ssb#0), and the number of PRACH transmissions of the nth random access attempt is the same as the number of PRACH transmissions of the nth-1 random access attempt (for example, the number of PRACH transmissions is equal to 2), in which case, the terminal may perform one power ramp on the basis of the PRACH transmission power of the nth-1 random access attempt, and the step of performing the power ramp is the first power ramp step, the PRACH transmission power of the nth random access attempt may be equal to the sum of the PRACH transmission power of the nth-1 random access attempt and the first power ramp step.

Alternatively, the first power ramp step may be a fixed value; or the first power climbing step length can be determined according to the PRACH transmission number of the Nth random access attempt and a first mapping relation between the power climbing step length and the PRACH transmission number; or the first power climbing step length is determined according to the PRACH transmission number of the Nth random access attempt and the reference signal selected by the Nth random access attempt, and a second mapping relation between the power climbing step length, the PRACH transmission number and the reference signal.

For example, the first power ramp-up step may be a fixed step, which is used for each power ramp-up.

For example, a first mapping relationship between the power ramp-up step size and the number of PRACH transmissions may be set, i.e., different PRACH transmission numbers correspond to different power ramp-up step sizes. For example, assuming that the number of PRACH transmissions is 1, the corresponding power ramp-up step is p1; when the transmission quantity of the PRACH is 2, the corresponding power climbing step length is p2; when the transmission number of the PRACH is 4, the corresponding power climbing step length is p3; if the number of PRACH transmissions is 8, the corresponding power ramp-up step is p4, and if the number of PRACH transmissions in the nth random access attempt is 2, it may be determined that the first power ramp-up step corresponding to the nth random access attempt is p2.

For example, a second mapping relationship between the power ramp-up step size and the number of PRACH transmissions and the reference signal may be set, i.e., different PRACH transmission numbers and reference signal combinations correspond to different power ramp-up step sizes. For example, assuming that the number of PRACH transmissions is 2 and the reference signal is ssb#0, the corresponding power ramp-up step is p5; when the transmission number of PRACH is 2 and the reference signal is SSB#1, the corresponding power climbing step length is p6; when the transmission number of PRACH is 4 and the reference signal is SSB#1, the corresponding power climbing step length 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, then the first power ramp-up step corresponding to the nth random access attempt may be determined to be p5.

Optionally, one or more of the fixed value of the first power ramp-up step, the first mapping relation, the second mapping relation may be pre-defined by a protocol or indicated by a network device (e.g. a base station).

Optionally, the network device may indicate one or more of the following through the first signaling:

A fixed value of the first power ramp step;

Alternatively, the first signaling may be semi-static radio resource control (Radio Resource Control, RRC) signaling configured by a higher layer, system information block1 (System Information Block, SIB 1) information, or other dynamic signaling, and the specific situation is not limited.

In one embodiment, the terminal may not perform power ramp-up when it is determined that the nth random access attempt is different from the reference signal selected by the N-1 th random access attempt, or the number of PRACH transmissions of the nth random access attempt is different from the number of PRACH transmissions of the N-1 th random access attempt, or the number of PRACH transmissions and the reference signal corresponding to the nth random access attempt are both different from the number of PRACH transmissions corresponding to the N-1 th random access attempt, and the PRACH transmission power of the nth random access attempt may be equal to the PRACH transmission power of the N-1 th random access attempt.

(2) And determining PRACH transmission power of the nth random access attempt based on the reference signals respectively selected by the nth random access attempt and 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.

Specifically, in the embodiment of the present application, when determining the PRACH transmission power of the nth random access attempt, the terminal may first determine the reference signals selected by the nth random access attempt and the N-1 random access attempts before the nth random access attempt, and the number of PRACH transmissions corresponding to the nth random access attempt and the N-1 random access attempts before the nth random access attempt, and determine whether or how to perform power ramp-up in the current random access attempt based on the current and previous cases of multiple random access attempts.

Optionally, determining the PRACH transmission power of the nth random access attempt based on the reference signal respectively selected by the nth random access attempt and the N-1 random access attempts before the nth random access attempt and the number of PRACH transmissions respectively corresponding to the N-1 random access attempts before the nth random access attempt includes:

Performing a power ramp-up according to a first power ramp-up step and PRACH transmission power of a random access attempt that most recently satisfies a first condition in the case that at least one random access attempt satisfying the first condition exists in N-1 random access attempts before an nth random access attempt;

In one embodiment, if there is at least one random access attempt satisfying the first condition in N-1 random access attempts before the nth random access attempt, in this case, the terminal may perform a power ramp on the basis of the PRACH transmission power of the last random access attempt satisfying the first condition, and the step of performing the power ramp is the first power ramp step, and the PRACH transmission power of the nth random access attempt may be equal to the sum of the PRACH transmission power of the last random access attempt satisfying the first condition and the first power ramp step.

Wherein, the random access attempt satisfying 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, the number of prach transmissions is 2, the reference signal corresponding to the nth-1 random access attempt is ssb#1, the number of prach transmissions is 2, the reference signal corresponding to the nth-2 random access attempts is ssb#0, the number of prach transmissions is 4, the reference signal corresponding to the nth-3 random access attempts is ssb#0, and the number of prach transmissions is 2, then the nth-3 random access attempts are the last random access attempts satisfying the first condition.

Optionally, one or more of the fixed value of the first power ramp step, the first mapping relation, the second mapping relation may be predefined by a protocol or indicated by a network device.

In the case that no random access attempt meeting the first condition exists in N-1 random access attempts before the Nth random access attempt, power climbing is not performed;

In one embodiment, if no random access attempt satisfying the first condition exists in N-1 random access attempts before the nth random access attempt, the nth random access attempt does not perform power ramping, and the PRACH transmission power of the nth random access attempt may be equal to the PRACH transmission power of the nth-1 random access attempt.

For example, assuming that the nth random access attempt is the 3 rd random access attempt, the reference signal corresponding to the 3 rd random access attempt is ssb#0, the number of PRACH transmissions is 8, the reference signal corresponding to the 2 nd random access attempt is ssb#0, the number of PRACH transmissions is 4, the reference signal corresponding to the 1 st 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 2 nd random access attempts before the 3 rd random access attempt are different from the reference signal and the number of PRACH transmissions corresponding to the 3 rd random access attempt, and the terminal cannot find a random access attempt satisfying the first condition, then the 3 rd random access attempt may not perform power ramp.

Fig. 2 is a second flowchart of a method for controlling PRACH transmission power in a random access procedure according to an embodiment of the present application, where the method can be applied to a network device (e.g., a base station), and as shown in fig. 2, the method includes the following steps:

Step 200, a first signaling is sent, wherein the first signaling is used for indicating a power climbing step length to a terminal, and the power climbing step length is used for determining PRACH sending power of a random access attempt by the terminal;

Wherein the first signaling includes one or more of the following:

A fixed value of the first power ramp step;

In the case of a terminal performing a power climb, the power climb step employed to perform the power climb (such as the first power climb step) may be network equipment indicated.

A fixed value of the first power ramp step;

The first signaling may be a semi-static RRC signaling of a higher layer configuration, SIB1 information, or other dynamic signaling, and the specific situation is not limited.

Alternatively, the first power ramp step may be a fixed value; or the first power climbing step length corresponding to the nth random access attempt can be determined according to the PRACH transmission number of the nth random access attempt and the first mapping relation between the power climbing step length and the PRACH transmission number; or the first power ramp-up step corresponding to the nth random access attempt may be determined according to the number of PRACH transmissions in the nth random access attempt and the reference signal selected by the nth random access attempt, and a second mapping relationship between the power ramp-up step and the number of PRACH transmissions and the reference signal. Wherein N is an integer greater than 1.

According to the control method for the PRACH transmission power in the random access process, which is provided by the embodiment of the application, the network equipment can indicate the power climbing step length for determining the PRACH transmission power of the Nth random access attempt to the terminal, so that the terminal can also improve the PRACH transmission power when transmitting a plurality of PRACH in one random access attempt, the success rate of random access is improved, and the flexibility of random access design is improved.

The methods provided by the embodiments of the present application are based on the same application conception, so that the implementation of each method can be referred to each other, and the repetition is not repeated.

The following illustrates the method provided by each of the above embodiments of the present application by way of examples of specific application scenarios.

Example 1:

In this embodiment, it is assumed that the terminal transmits 2 PRACH on 2 ROs associated with ssb#0, and the PRACH transmission power corresponding to RA ATTEMPT is P1. However, in this attempt the terminal fails to access the cell, and the terminal then initiates RA ATTEMPT more times. The second time RA ATTEMPT is the current RA ATTEMPT, the terminal transmits M PRACH on the M ROs associated with ssb#a.

If ssb#a is ssb#0 and m=2, that is, the reference signal and the number of PRACH transmitted currently used by RA ATTEMPT are the same as the reference signal and the number of PRACH transmitted last time used in RA ATTEMPT, the terminal accumulates one power mapping on PRACH transmission power P1 corresponding to last time RA ATTEMPT. For example, the count parameter preamble_power_ RAMPING _counter corresponding to POWER mapping is incremented by 1. At this time, the PRACH transmission power corresponding to the current RA ATTEMPT is "p1+ power ramp step". The power ramp 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+the current PRACH transmission number level m=2, which is not limited in this embodiment. The fixed value or the value corresponding to the different PRACH transmission number grades may be predefined by the terminal and the network side through a protocol, or the network side notifies the terminal through signaling, where the signaling may be semi-static RRC signaling configured by a higher layer, SIB1 information, or other dynamic signaling, etc.

If ssb#a is ssb#1 and m=2, that is, the reference signal currently used by RA ATTEMPT is different from the reference signal used in RA ATTEMPT last time, power mapping is not performed at present RA ATTEMPT.

If ssb#a is ssb#0 and m=4, i.e., the number of PRACH transmitted currently RA ATTEMPT is different from the number of PRACH transmitted last RA ATTEMPT, power mapping is not performed currently RA ATTEMPT.

If ssb#a is ssb#1 and m=4, that is, the number of reference signals and PRACH transmitted currently RA ATTEMPT is different from the number of reference signals and PRACH transmitted last RA ATTEMPT, power mapping is not performed currently RA ATTEMPT.

Example 2:

In this embodiment, it is assumed that the initial access of the terminal transmits 4 PRACH on the 4 ROs associated with ssb#0, and the PRACH transmission power corresponding to RA ATTEMPT is P1. However, this time the terminal fails to access the cell, the terminal then initiates RA ATTEMPT more times. The second RA ATTEMPT terminal transmits 2 PRACH on the 2 ROs associated with ssb#1, and the PRACH transmission power corresponding to the second RA ATTEMPT is P2. Similarly, the second attempt terminal has not successfully accessed the cell yet, and the terminal then initiates RA ATTEMPT a third time. Third RA ATTEMPT is current RA ATTEMPT, the terminal transmits M PRACH on M ROs associated with ssb#a.

If ssb#a is ssb#0 and m=4, i.e., the reference signal and the number of PRACH transmissions currently employed by RA ATTEMPT are the same as those employed in first RA ATTEMPT, the terminal may accumulate one power mapping on PRACH transmission power P1 corresponding to first RA ATTEMPT. For example, the count parameter preamble_power_ RAMPING _counter corresponding to POWER mapping is incremented by 1. At this time, the PRACH transmission power corresponding to the current RA ATTEMPT is "p1+ power ramp step".

If ssb#a is ssb#1 and m=2, i.e., the number of PRACH times the reference signal and transmission currently adopted by RA ATTEMPT is the same as the number of PRACH times the reference signal and transmission were adopted in last time, i.e., second time RA ATTEMPT, the terminal may accumulate one power ramp on the PRACH transmission power P2 corresponding to last time, i.e., second time RA ATTEMPT. For example, the count parameter preamble_power_ RAMPING _counter corresponding to POWER mapping is incremented by 1. At this time, the PRACH transmission power corresponding to the current RA ATTEMPT is "p2+ power ramp step".

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

If ssb#a is ssb#0 and m=2, that is, the terminal cannot find the reference signal adopted by RA ATTEMPT and the number of PRACH transmitted once in the current random access process is the same as that of current RA ATTEMPT, at this time, current RA ATTEMPT does not perform power mapping.

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, no power mapping is currently performed by RA ATTEMPT.

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

The method and the device provided by the embodiments of the present application are based on the same application conception, and because the principles of solving the problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repetition is not repeated.

Fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present application, and as shown in fig. 3, the terminal includes a memory 320, a transceiver 310 and a processor 300; wherein the processor 300 and the memory 320 may also be physically separate.

A memory 320 for storing a computer program; a transceiver 310 for transceiving data under the control of the processor 300.

In particular, the transceiver 310 is used to receive and transmit data under the control of the processor 300.

Wherein in fig. 3, a bus architecture may comprise any number of interconnected buses and bridges, and in particular, one or more processors represented by processor 300 and various circuits of memory represented by memory 320, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., all as are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 310 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The user interface 330 may also be an interface capable of interfacing with an inscribed desired device for a different user device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

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

The processor 300 may be a central processing unit (Central Processing Unit, CPU), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), or complex Programmable logic device (Complex Programmable Logic Device, CPLD), or the processor may employ a multi-core architecture.

Processor 300 is operable to perform any of the methods provided by embodiments of the present application in accordance with the obtained executable instructions by invoking a computer program stored in memory 320, for example: determining PRACH transmission power of the nth random access attempt based on the selected reference signal of 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 in the nth random access attempt is greater than or equal to 1.

Optionally, determining the PRACH transmission 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:

Determining PRACH transmitting power of the nth random access attempt based on the reference signals respectively selected by the nth random access attempt and the (N-1) th random access attempt and PRACH transmission numbers respectively corresponding to the nth random access attempt and the (N-1) th random access attempt; or alternatively

And determining PRACH transmission power of the nth random access attempt based on the reference signals respectively selected by the nth random access attempt and 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.

Optionally, the first power ramp step is a fixed value; or alternatively

The first power climbing step length is determined according to the PRACH transmission number of the Nth random access attempt, the reference signal selected by the Nth random access attempt and a second mapping relation between the power climbing step length, the PRACH transmission number and the reference signal.

Optionally, one or more of the fixed value of the first power ramp-up step, the first mapping relation, the second mapping relation is pre-defined by a protocol or indicated by a network device.

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

Fig. 4 is a schematic structural diagram of a network device according to an embodiment of the present application, and as shown in fig. 4, 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 physically separate.

A memory 420 for storing a computer program; a transceiver 410 for transceiving data under the control of the processor 400.

In particular, the transceiver 410 is used to receive and transmit data under the control of the processor 400.

Wherein in fig. 4, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 400 and various circuits of memory represented by memory 420, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., all as are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 410 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc.

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

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

The processor 400 is configured to execute any of the methods provided by the embodiments of the present application according to the obtained executable instructions by calling a computer program stored in the memory 420, for example: transmitting a first signaling, wherein the first signaling is used for indicating a power climbing step length to a terminal, and the power climbing step length is used for determining PRACH transmitting power of a random access attempt by the terminal;

Wherein the first signaling includes one or more of the following:

A fixed value of the first power ramp step;

It should be noted that, the terminal and the network device provided by the embodiments of the present application can implement all the method steps implemented by the embodiments of the present application, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the embodiments of the present application are omitted herein.

Fig. 5 is a schematic structural diagram of a control device for PRACH transmission power in a random access procedure according to an embodiment of the present application, where the device may be applied to a terminal, as shown in fig. 5, and the device includes:

a determining unit 500, configured to determine PRACH transmission 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;

Optionally, the first power ramp step is a fixed value; or alternatively

Fig. 6 is a second schematic structural diagram of a control device for PRACH transmission power in a random access procedure according to an embodiment of the present application, where the device may be applied to a network device, as shown in fig. 6, and the device includes:

A transmitting unit 600, configured to transmit a first signaling, where the first signaling is used to indicate a power ramp step to a terminal, and the power ramp step is used by the terminal to determine PRACH transmission power of a random access attempt;

Wherein the first signaling includes one or more of the following:

A fixed value of the first power ramp step;

It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

It should be noted that, the above device provided in the embodiment of the present application can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.

On the other hand, the embodiment of the application also provides a computer readable storage medium, and the computer readable storage medium stores a computer program, and the computer program is used for making a computer execute the control method of the random access procedure PRACH transmission power provided by the above embodiments.

It should be noted that, the computer readable storage medium provided in the embodiment of the present application can implement all the method steps implemented in the above method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.

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 (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), etc.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G system. For example, applicable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (GENERAL PACKET Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR) systems, and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved PACKET SYSTEM, EPS), 5G system (5 GS), etc. may also be included in the system.

The terminal according to the embodiment of the application can be a device for providing voice and/or data connectivity for a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem, etc. The names of terminals may also be different in different systems, for example in a 5G system, a terminal may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as Personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal DIGITAL ASSISTANT, PDA) and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (ACCESS TERMINAL), user terminal device (user terminal), user agent (user agent), user equipment (user device), and embodiments of the present application are not limited.

The network device according to the embodiment of the present application may be a base station, where the base station may include a plurality of cells for providing services for the terminal. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. The network device may be configured to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), etc., which are not limited in the embodiment of the present application. In some network structures, the network devices may include centralized unit (centralized unit, CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.

Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions may each be made between the network device and the terminal using one or more antennas, and the MIMO transmissions may be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. The control method of the PRACH transmission power of the physical random access channel in the random access process is characterized by being applied to a terminal and comprising the following steps:

2. The method for controlling PRACH transmission power during random access according to claim 1, wherein determining PRACH transmission power for an 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 comprises:

3. The method for controlling PRACH transmission power during random access according to claim 2, wherein determining PRACH transmission power for the nth random access attempt based on the reference signal selected by the nth random access attempt and the N-1 th random access attempt, and the number of PRACH transmissions corresponding to the nth random access attempt and the N-1 th random access attempt, respectively, comprises:

4. The method for controlling PRACH transmission power during random access according to claim 2, wherein determining PRACH transmission power for the nth random access attempt based on the reference signal selected by the nth random access attempt and the N-1 th random access attempt, and the number of PRACH transmissions corresponding to the nth random access attempt and the N-1 th random access attempt, respectively, comprises:

5. The method for controlling PRACH transmission power during random access according to claim 2, wherein determining PRACH transmission power for an nth random access attempt based on reference signals respectively selected for the nth random access attempt and N-1 random access attempts before the nth random access attempt, and PRACH transmission numbers respectively corresponding to the nth random access attempt and N-1 random access attempts before the nth random access attempt, comprises:

6. The method for controlling PRACH transmission power during random access according to claim 2, wherein determining PRACH transmission power for an nth random access attempt based on reference signals respectively selected for the nth random access attempt and N-1 random access attempts before the nth random access attempt, and PRACH transmission numbers respectively corresponding to the nth random access attempt and N-1 random access attempts before the nth random access attempt, comprises:

7. The method for controlling PRACH transmission power according to claim 3 or 5, wherein the first power ramp-up step is a fixed value; or alternatively

8. The method of claim 7, wherein one or more of the fixed value of the first power ramp-up step, the first mapping relationship, and the second mapping relationship are predefined by a protocol or indicated by a network device.

9. The method according to any one of claims 1 to 6, wherein the reference signal comprises a synchronization signal block SSB or a channel state information reference signal CSI-RS.

10. The method for controlling the PRACH transmission power of the physical random access channel in the random access process is characterized by being applied to network equipment and comprising the following steps:

Wherein the first signaling includes one or more of the following:

A fixed value of the first power ramp step;

11. A terminal comprising a memory, a transceiver, and a processor;

Determining PRACH transmission power of an Nth random access attempt based on the selected reference signal of the Nth random access attempt and the PRACH transmission number of the physical random access channel of the Nth random access attempt;

12. The terminal of claim 11, wherein the determining the PRACH transmit power for the nth random access attempt based on the selected reference signal for the nth random access attempt and the number of PRACH transmissions for the nth random access attempt comprises:

13. The terminal of claim 12, wherein the determining the PRACH transmit power for the nth random access attempt based on the reference signal respectively selected for the nth random access attempt and the N-1 th random access attempt and the number of PRACH transmissions respectively corresponding to the nth random access attempt and the N-1 th random access attempt comprises:

14. The terminal of claim 12, wherein the determining the PRACH transmit power for the nth random access attempt based on the reference signal respectively selected for the nth random access attempt and the N-1 th random access attempt and the number of PRACH transmissions respectively corresponding to the nth random access attempt and the N-1 th random access attempt comprises:

15. The terminal of claim 12, wherein the determining PRACH transmit power for the nth random access attempt based on the reference signal respectively selected for the nth random access attempt and the N-1 random access attempts preceding 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 preceding the nth random access attempt, comprises:

16. The terminal of claim 12, wherein the determining PRACH transmit power for the nth random access attempt based on the reference signal respectively selected for the nth random access attempt and the N-1 random access attempts preceding 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 preceding the nth random access attempt, comprises:

17. The terminal of claim 13 or 15, wherein the first power ramp step size is a fixed value; or alternatively

18. The terminal of claim 17, wherein one or more of the fixed value of the first power ramp-up step, the first mapping relationship, and the second mapping relationship are pre-defined by a protocol or indicated by a network device.

19. The terminal according to any of the claims 11 to 16, characterized in that the reference signal comprises a synchronization signal block SSB or a channel state information reference signal CSI-RS.

20. A network device comprising a memory, a transceiver, and a processor;

transmitting a first signaling, wherein the first signaling is used for indicating a power climbing step length to a terminal, and the power climbing step length is used for determining the PRACH transmitting power of a random access attempt by the terminal;

Wherein the first signaling includes one or more of the following:

A fixed value of the first power ramp step;

21. A control device for PRACH transmission power of a physical random access channel in a random access procedure, which is applied to a terminal, comprising:

22. A control device for PRACH transmission power of a physical random access channel in a random access procedure, which is applied to a network device, and comprises:

Wherein the first signaling includes one or more of the following:

A fixed value of the first power ramp step;

23. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for causing a computer to perform the method of any one of claims 1 to 9 or to perform the method of claim 10.