WO2024093639A1 - Procédé et appareil de commande de puissance de transmission prach dans une procédure d'accès aléatoire - Google Patents

Procédé et appareil de commande de puissance de transmission prach dans une procédure d'accès aléatoire Download PDF

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Publication number
WO2024093639A1
WO2024093639A1 PCT/CN2023/124268 CN2023124268W WO2024093639A1 WO 2024093639 A1 WO2024093639 A1 WO 2024093639A1 CN 2023124268 W CN2023124268 W CN 2023124268W WO 2024093639 A1 WO2024093639 A1 WO 2024093639A1
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Prior art keywords
random access
access attempt
nth
prach
power
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PCT/CN2023/124268
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English (en)
Chinese (zh)
Inventor
沈姝伶
邢艳萍
高雪娟
司倩倩
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大唐移动通信设备有限公司
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Publication of WO2024093639A1 publication Critical patent/WO2024093639A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • 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.
  • 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.
  • PRACH Physical Random Access Channel
  • the terminal when the terminal makes the first random access attempt, it will calculate the initial power of PRACH transmission.
  • the terminal can increase the transmit power based on the initial transmit power of PRACH.
  • the embodiments of the present disclosure provide a method and device for controlling PRACH transmission power in a random access process.
  • 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:
  • PRACH physical random access channel
  • 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.
  • 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:
  • 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:
  • 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 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:
  • 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:
  • 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 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:
  • 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 first power ramp-up step is a fixed value
  • 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 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.
  • the reference signal comprises a synchronization signal block SSB or a channel state information reference signal CSI-RS.
  • 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:
  • PRACH physical random access channel
  • the first signaling includes one or more of the following:
  • 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:
  • 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 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:
  • the PRACH transmit power of the Nth random access attempt.
  • 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:
  • 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 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:
  • 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:
  • 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 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:
  • 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 first power ramp-up step is a fixed value
  • 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.
  • 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.
  • the reference signal comprises a synchronization signal block SSB or a channel state information reference signal CSI-RS.
  • an embodiment of the present disclosure further provides a network device, 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:
  • the first signaling includes one or more of the following:
  • 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;
  • 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.
  • 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:
  • 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.
  • 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.
  • 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.
  • 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 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.
  • 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.
  • the term "and/or” describes the association relationship of associated objects, indicating that three relationships may exist.
  • 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.
  • plurality in the embodiments of the present disclosure refers to two or more than two, and other quantifiers are similar thereto.
  • 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.
  • RSRP reference signal received power
  • SSB synchronization signal block
  • CSI-RS channel state information reference signal
  • 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.
  • 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.
  • the terminal 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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:
  • the terminal 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.
  • 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:
  • 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 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the network device may indicate one or more of the following through the first signaling:
  • 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.
  • RRC Radio Resource Control
  • SIB1 System Information Block 1, SIB1
  • 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:
  • 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.
  • the terminal 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.
  • 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.
  • 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.
  • 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.
  • 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 N-1th random access attempt is SSB#1
  • the number of PRACH transmissions is 2
  • the reference signal corresponding to the N-2th random access attempt is SSB#0
  • the number of PRACH transmissions is 4
  • the reference signal corresponding to the N-3rd random access attempt is SSB#0
  • 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.
  • 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.
  • 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.
  • 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 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 N-th random access attempt 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.
  • 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
  • the number of PRACH transmissions is 4
  • the reference signal corresponding to the first random access attempt is SSB#1
  • 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:
  • 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.
  • 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.
  • 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.
  • the network device may indicate one or more of the following through the first signaling:
  • 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.
  • 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 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.
  • 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.
  • 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.
  • the method for controlling the PRACH transmission power in the random access process 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.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the terminal transmits two PRACHs on two ROs associated with SSB#0, and the PRACH transmission power corresponding to this RA attempt is P1.
  • 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.
  • 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.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • 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.
  • 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.
  • 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.
  • 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".
  • 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.
  • the PRACH transmission power corresponding to the current RA attempt is "P2 + power ramping step size".
  • 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.
  • 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.
  • 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.
  • the transceiver 310 is used to receive and send data under the control of the processor 300 .
  • 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.
  • 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.
  • 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:
  • 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.
  • 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:
  • 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.
  • 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:
  • 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.
  • the number of PRACH transmissions to be tested is different, no power ramping is performed.
  • 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.
  • 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.
  • the first power ramp-up step is a fixed value
  • 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 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.
  • 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.
  • the reference signal comprises a synchronization signal block SSB or a channel state information reference signal CSI-RS.
  • FIG4 is a schematic diagram of the structure of a network device provided in an embodiment of the present disclosure.
  • 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.
  • the transceiver 410 is used to receive and send data under the control of the processor 400 .
  • 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:
  • 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;
  • 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.
  • 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:
  • 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.
  • 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:
  • 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 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:
  • 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.
  • 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.
  • the first power ramp-up step is a fixed value
  • 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 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.
  • 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.
  • the reference signal comprises a synchronization signal block SSB or a channel state information reference signal CSI-RS.
  • 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:
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • magnetic storage such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.
  • optical storage such as CD, DVD, BD, HVD, etc.
  • semiconductor storage such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)
  • 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.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD LTE frequency division duplex
  • TDD LTE time division duplex
  • LTE-A long term evolution advanced
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • NR new radio
  • the system can also include core network parts, such as the Evolved Packet
  • 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.
  • the name of the terminal may also be different.
  • the terminal in a 5G system, the terminal may be called a user equipment (UE).
  • UE user equipment
  • a wireless terminal device can communicate with one or more core networks (CN) via a radio access network (RAN).
  • RAN radio access network
  • 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.
  • 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.
  • 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.
  • 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.
  • IP Internet Protocol
  • the network device may also coordinate the attribute management of the air interface.
  • 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).
  • BTS Base Transceiver Station
  • GSM Global System for Mobile communications
  • CDMA Code Division Multiple Access
  • NodeB Wide-band Code Division Multiple Access
  • an evolutionary network device evolutional Node B, eNB or e-NodeB
  • LTE long term evolution
  • 5G base station 5G network architecture
  • 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.
  • CU centralized unit
  • DU distributed unit
  • 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).
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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Abstract

Des modes de réalisation de la présente divulgation concernent un procédé et un appareil de commande de puissance de transmission de PRACH dans une procédure d'accès aléatoire. Le procédé comprend les étapes suivantes : un terminal détermine une puissance de transmission de PRACH d'une N-ième tentative d'accès aléatoire sur la base d'un signal de référence sélectionné dans la N-ième tentative d'accès aléatoire et du nombre de transmissions de PRACH de la N-ième tentative d'accès aléatoire, N étant un nombre entier supérieur à 1, et le nombre de transmissions de PRACH de la N-ième tentative d'accès aléatoire étant supérieur ou égal à 1.
PCT/CN2023/124268 2022-11-04 2023-10-12 Procédé et appareil de commande de puissance de transmission prach dans une procédure d'accès aléatoire WO2024093639A1 (fr)

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Citations (4)

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US20180324716A1 (en) * 2017-05-04 2018-11-08 Ofinno Technologies, Llc RACH Power Adjustment
CN111355563A (zh) * 2018-12-24 2020-06-30 深圳市中兴微电子技术有限公司 一种随机接入方法及装置、终端、存储介质
US20210083822A1 (en) * 2018-06-08 2021-03-18 Fujitsu Limited Method and apparatus for determining power
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US20210083822A1 (en) * 2018-06-08 2021-03-18 Fujitsu Limited Method and apparatus for determining power
CN111355563A (zh) * 2018-12-24 2020-06-30 深圳市中兴微电子技术有限公司 一种随机接入方法及装置、终端、存储介质
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