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WO2012162987A1 - Procédé de détermination de puissance et équipement d'utilisateur - Google Patents

Procédé de détermination de puissance et équipement d'utilisateur Download PDF

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Publication number
WO2012162987A1
WO2012162987A1 PCT/CN2011/080128 CN2011080128W WO2012162987A1 WO 2012162987 A1 WO2012162987 A1 WO 2012162987A1 CN 2011080128 W CN2011080128 W CN 2011080128W WO 2012162987 A1 WO2012162987 A1 WO 2012162987A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmit power
random access
user equipment
preamble
access procedure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/080128
Other languages
English (en)
Chinese (zh)
Inventor
景叔武
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to PCT/CN2011/080128 priority Critical patent/WO2012162987A1/fr
Priority to CN201180002198.1A priority patent/CN103125136B/zh
Publication of WO2012162987A1 publication Critical patent/WO2012162987A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • 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

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a power determining method and a user equipment. Background technique
  • LTE Long Term Evolution
  • 3G Third Generation
  • UE International User Equipment
  • the success rate of access is very important, and the higher access success rate is beneficial to improve the reliability of the system; in the whole access process, power control, especially It is critical that the power control in the random access process is critical.
  • the network side device also known as the base station or the evolved base station (English is Evolved Universal Terrestrial Radio Access Network NodeB/Evolved) NodeB; hereinafter referred to as: eNodeB) Received and correctly demodulated; If the UE's transmit power is too high, it will affect the access of other UEs, and the power is too low to guarantee successful access.
  • the network side device also known as the base station or the evolved base station (English is Evolved Universal Terrestrial Radio Access Network NodeB/Evolved) NodeB; hereinafter referred to as: eNodeB) Received and correctly demodulated; If the UE's transmit power is too high, it will affect the access of other UEs, and the power is too low to guarantee successful access.
  • the UE and the network side device complete the handshake through a series of signaling interactions, and the preamble (Preamble in English) signal is the first handshake signaling in the access process, so the Preamble Whether the signal is successfully received by the network side device and correctly demodulated is the most important step for random access success, and the transmit power of the Preamble signal is the key to success.
  • the preamble Preamble in English
  • the UE calculates the transmission time and the transmission power of the Preamble signal according to the configuration information of the network side device. After the initial transmission failure of the Preamble signal, the UE recalculates the transmission time and the transmission power of the Preamble signal, according to the calculation result. Retransmitting, the number of retransmissions is passed by the network side device through the system message (English is System Information Block; hereinafter referred to as: SIB) is configured for the UE.
  • SIB System Information Block
  • the uplink power control of the LTE, the transmit power of the Preamble in the random access process is calculated by using the open loop power control, and the network side device configures the initial transmit power, the power up step and the maximum number of times of the UE, and passes the system message.
  • the configuration information is sent to the UE.
  • the transmit power of the preamble in the random access process always starts from a fixed value, and is upgraded according to the configured power up step, and the preamble is obtained after the maximum number of transmissions is reached. The transmit power is no longer raised, and if it is still not connected, the access fails.
  • the embodiment of the present invention provides a power determining method and a user equipment, so as to implement an initial transmit power of a preamble in a non-initial random access process, and improve a success rate of user equipment access.
  • An aspect of the present invention provides a power determining method, including:
  • the total uplink value of the transmit power is equal to the sum of the respective transmit power lifting values of the user equipment from the first random access procedure to the m-1th random access procedure; the user equipment is the nth random
  • the transmit power lifting value of the access procedure is equal to the transmit power of the last transmit preamble of the user equipment in the nth random access procedure and the first time of the user equipment in the nth random access procedure
  • the difference of the transmit power of the preamble is transmitted, where n is a positive integer, 1 ⁇ n ⁇ ml.
  • Another aspect of the present invention also provides a user equipment, including:
  • a processor configured to perform a total rise in initial transmit power and transmit power according to the user equipment The value determines the initial transmit power of the preamble in the mth random access process, where m is a positive integer, m>2; wherein the total lift value of the transmit power is equal to the first random access process of the user equipment to the mth a sum of the respective transmit power boost values of the random access procedure; the transmit power boost value of the nth random access procedure of the user equipment is equal to the last of the user equipment in the nth random access procedure a difference between a transmit power of a transmit preamble and a transmit power of a first transmit preamble of the user equipment in the nth random access procedure, where n is a positive integer, l ⁇ n ⁇ ml;
  • a transmitter for transmitting a preamble during a random access procedure for transmitting a preamble during a random access procedure.
  • the user equipment determines the initial transmit power of the preamble in the mth random access process according to the initial transmit power of the user equipment and the total rise value of the transmit power, so that the user equipment can determine the preamble in the non-initial random access process.
  • the initial transmit power, and then the transmit power of the preamble in the non-initial random access process may be determined according to the determined initial transmit power, thereby improving the success rate of the user equipment access and improving the reliability of the system.
  • FIG. 1 is a flow chart of an embodiment of a power determining method according to the present invention.
  • FIG. 2 is a flow chart of another embodiment of a power determining method according to the present invention.
  • FIG. 3 is a schematic structural diagram of an embodiment of a user equipment according to the present invention. detailed description
  • FIG. 1 is a flowchart of an embodiment of a power determining method according to the present invention. As shown in FIG. 1, the power determining method may include:
  • Step 101 The UE determines, according to the initial transmit power of the UE and the total raised value of the transmit power, an initial transmit power of the preamble in the mth random access process, where m is a positive integer, and m ⁇ 2.
  • the initial transmit power of the preamble in the mth random access procedure is equal to the sum of the initial transmit power of the UE and the total rise value of the transmit power.
  • the initial transmit power of the UE is configured by the network side device to the UE.
  • the total raised value of the foregoing transmit power is equal to the sum of the respective transmit power lifting values of the UE from the first random access procedure to the m-th random access procedure; the transmit power of the UE's nth random access procedure
  • the value of the rise is equal to the difference between the transmit power of the last transmit preamble of the UE in the nth random access procedure and the transmit power of the first transmit preamble of the UE during the nth random access procedure, where n is a positive integer.
  • the UE transmits the transmit power of the preamble in the nth random access process, which is recorded after the UE fails in the nth random access procedure; the UE sends the preamble for the first time in the nth random access procedure.
  • the transmit power may be recorded after the UE calculates the transmit power of the first transmit preamble in the nth random access procedure, or may be recorded after the nth random access procedure fails.
  • the UE may determine, according to the initial transmit power of the preamble in the mth random access procedure and the maximum transmit power of the UE, the transmit power of the ith transmit preamble in the mth random access procedure, where i is a positive integer, i ⁇ l.
  • the transmit power of the ith transmission preamble in the mth random access procedure is specifically:
  • min U represents the minimum value of the minimum of two parameters in ⁇ ;
  • P PRACH (i) is The transmit power of the ninth transmission of the preamble in the mth random access procedure; the initial transmit power of the preamble in the mth random access process, which is the maximum transmit power of the UE;
  • P DdtaPreambk is the power allocated to the UE by the network side device Offset value;
  • P is the current path loss value of the UE;
  • P Step is the power up step size configured by the network side device to the UE;
  • N tx (i-1 ) is the i th transmit preamble in the mth random access process The number of preamble retransmissions.
  • the network side device may be an access network node such as a base station or an eNodeB, which is not limited in this embodiment.
  • the UE determines the initial transmit power of the preamble in the mth random access procedure according to the initial transmit power of the UE and the total raised value of the transmit power, where m is a positive integer, m>2;
  • the initial transmit power of the preamble in the initial random access process, and the transmit power of the preamble in the non-initial random access process may be determined according to the determined initial transmit power, thereby improving the success rate of the UE access and improving the reliability of the system.
  • FIG. 2 is a flowchart of another embodiment of a power determining method according to the present invention.
  • an eNodeB is used as an example.
  • the power determining method may include:
  • Step 201 The UE receives the system message sent by the eNodeB, and obtains a configuration parameter of the power control carried by the system message.
  • Step 202 The UE calculates a transmit power of the preamble in the first random access procedure.
  • the first random access procedure is an initial random access procedure.
  • the transmit power of the preamble in the first random access process may be calculated according to the formula (2) by using the power control configuration parameter sent by the eNodeB to the UE.
  • Min ⁇ ⁇ indicates the minimum value of the two parameters in ⁇
  • P RACH (i) is the transmit power of the ith transmission of the first transmission in the first random access procedure, i ⁇ l; P init ⁇ The initial transmit power that the eNodeB configures to the UE;
  • P D w is a power offset value configured for the eNodeB to the UE
  • P is the current path loss value of the UE
  • P Step is a power boosting step configured for the eNodeB to the UE
  • 1 ⁇ ⁇ is the maximum transmit power of the UE.
  • Step 203 After the first random access procedure fails, the UE records the transmit power of the last transmitted preamble in the first random access procedure.
  • the UE still does not receive the random access response (Random Access Response; RAR) message sent by the eNodeB to the UE.
  • RAR Random Access Response
  • the UE may record the transmit power of each transmit preamble, or record only the transmit power of the first and last transmit preambles.
  • the UE performs the recorded action after calculating the transmit power of the i-th transmission of the preamble, or the UE performs the recorded action at other timings.
  • Step 204 The UE calculates a difference between the transmit power of the last transmit preamble of the UE in the first random access procedure and the transmit power of the first transmit preamble of the UE in the first random access procedure, where the difference is The value is taken as the transmit power boost value of the UE during the first random access procedure.
  • Step 205 The UE accumulates the respective transmit power lifting values of the UE from the first random access procedure to the m-1th random access procedure to obtain a total lifting value of the transmitting power.
  • the total lifting value of the above transmit power is equal to the sum of the respective transmit power uplift values of the UE from the first random access procedure to the m-1th random access procedure; wherein m is a positive integer, m ⁇ 2 .
  • the transmit power lifting value of the nth random access procedure of the UE is equal to the UE at the nth
  • the difference between the transmit power of the last transmit preamble in the secondary random access procedure and the transmit power of the first transmit preamble of the UE during the nth random access procedure, n is a positive integer, l ⁇ n ⁇ m- l
  • Step 206 The UE determines an initial transmit power of the preamble in the mth random access procedure according to the initial transmit power of the eNodeB configured to the UE and the total raised value of the transmit power.
  • the manner in which the UE determines the initial transmit power of the preamble in the mth random access procedure according to the initial transmit power of the eNodeB configured to the UE and the total rise value of the transmit power may be as shown in the formula (3).
  • Step 207 The UE determines, according to the initial transmit power of the preamble in the mth random access procedure and the maximum transmit power of the UE, the transmit power of the ith transmit preamble in the mth random access procedure, as shown below:
  • min ⁇ ⁇ represents the minimum value of the two parameters in the ⁇ ;
  • P PRACH ( i) is the transmit power of the ith transmission of the preamble in the mth random access procedure;
  • P is the power offset of the eNodeB configured to the UE Set: ⁇ is the current path loss value of the UE;
  • P Step is the power boost step configured for the eNodeB to the UE;
  • N tx (i-1 ) is the preamble before the ith transmission of the preamble in the mth random access procedure Number of passes.
  • the UE may record the transmit power of the first transmit preamble in the mth random access procedure.
  • Step 208 The UE sends a preamble according to the transmit power of the ith transmission preamble in the mth random access procedure determined in step 207.
  • Step 209 After the mth random access procedure fails, the UE records the transmit power of the last transmit preamble in the mth random access procedure.
  • Step 210 The UE calculates a difference between the transmit power of the last transmit preamble of the UE in the mth random access process and the transmit power of the first transmit preamble of the UE during the mth random access process, where the difference is The value is used as the transmit power boost value of the UE during the mth random access procedure, and then returns to step 205 until the random access procedure is successful.
  • steps 205 to 210 are performed to implement adjustment of the total lifting value of the transmit power, thereby implementing the adjustment.
  • the initial transmit power of the preamble in the m+1 random access process so that the initial transmit power of the preamble can be adjusted during each non-initial random access process, and the preamble can be further used in each non-initial random access process.
  • the transmit power is adjusted to improve the success rate of UE access, especially to improve and improve the success rate of UE access at a far point, and improve system reliability.
  • FIG. 3 is a schematic structural diagram of an embodiment of a user equipment according to the present invention.
  • the user equipment in this embodiment may implement the process of the embodiment shown in FIG. 1 of the present invention.
  • the user equipment may include: a processor 31 and a transmitter 32;
  • the processor 31 is configured to determine, according to the initial transmit power of the user equipment and the total raised value of the transmit power, an initial transmit power of the preamble in the mth random access process, where m is a positive integer, m>2; wherein, the foregoing transmit power
  • the total lifting value is equal to the sum of the respective transmit power lifting values of the user equipment from the first random access procedure to the m-1th random access procedure;
  • the transmit power lifting value of the nth random access procedure of the user equipment is equal to the User equipment last in the nth random access process
  • Transmitter 32 configured to send a preamble during a random access procedure.
  • the processor 31 may further determine, according to the initial transmit power of the preamble in the mth random access procedure and the maximum transmit power of the user equipment, that the transmitter 32 is in the mth random access process. Transmitting the transmit power of the preamble, i is a positive integer, i ⁇ l;
  • the transmitter 32 may also send the preamble transmit power in the mth random access procedure determined by the processor 31, and send the preamble in the mth random access procedure.
  • the processor 31 may determine the sum of the initial transmit power of the user equipment and the total boost value of the transmit power as the initial transmit power of the preamble in the mth random access procedure.
  • the processor 31 may determine the transmit power P PRACH (i) of the ith transmission preamble in the mth random access procedure according to the following formula :
  • P PRACH (i) min ⁇ P pressure, +P DeltaPreamble +P pl +P Step x N ⁇ C i-1 )] ⁇ ;
  • min ⁇ ⁇ represents the minimum value of the two parameters in ⁇ ;
  • P DdtaPl6ambl6 is the power offset value assigned to the user equipment by the network side device;
  • P pl is the current path loss value of the user equipment;
  • P Step is the power allocated to the user equipment by the network side device The step size is raised;
  • N te (i-1 ) is the number of preamble retransmissions before the ith transmission of the preamble in the mth random access procedure.
  • the processor 31 determines the initial transmit power of the preamble in the mth random access process according to the initial transmit power of the user equipment and the total rise value of the transmit power; thereby, the user equipment may determine the non-initial random access procedure.
  • the initial transmit power of the preamble can be used to determine the transmit power of the preamble in the non-initial random access process according to the determined initial transmit power, thereby improving the success rate of the access of the user equipment and improving the reliability of the system.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé de détermination de puissance et à un équipement d'utilisateur. Le procédé de détermination de puissance selon l'invention comprend l'étape suivante : un équipement d'utilisateur détermine la puissance de transmission initiale du préambule durant la procédure d'accès aléatoire m, sur la base de la puissance de transmission initiale de l'équipement d'utilisateur et de la valeur d'élévation totale de la puissance de transmission. Dans le procédé selon l'invention, m est un nombre entier positif et m ≥ 2. D'autre part, la valeur d'élévation totale de la puissance de transmission est égale à la somme de la valeur d'élévation de la puissance de transmission, entre la 1ère procédure d'accès aléatoire et la procédure d'accès aléatoire (m - 1) de l'équipement d'utilisateur. La présente invention permet d'améliorer le taux de réussite des tentatives d'accès de l'équipement d'utilisateur et de renforcer la fiabilité du système.
PCT/CN2011/080128 2011-09-23 2011-09-23 Procédé de détermination de puissance et équipement d'utilisateur Ceased WO2012162987A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2011/080128 WO2012162987A1 (fr) 2011-09-23 2011-09-23 Procédé de détermination de puissance et équipement d'utilisateur
CN201180002198.1A CN103125136B (zh) 2011-09-23 2011-09-23 功率确定方法和用户设备

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CN108811061A (zh) * 2017-04-28 2018-11-13 维沃移动通信有限公司 一种上行发送功率控制方法和终端
CN110337143A (zh) * 2013-08-13 2019-10-15 华为技术有限公司 一种发送前导序列的方法及用户设备
CN111726875A (zh) * 2014-06-13 2020-09-29 华为技术有限公司 一种确定发送功率的方法及用户设备

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CN108811061B (zh) * 2017-04-28 2020-06-19 维沃移动通信有限公司 一种上行发送功率控制方法和终端

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