WO2012034410A1 - Procédé et terminal mobile pour éviter un conflit d'accès aléatoire - Google Patents

Procédé et terminal mobile pour éviter un conflit d'accès aléatoire Download PDF

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Publication number
WO2012034410A1
WO2012034410A1 PCT/CN2011/074559 CN2011074559W WO2012034410A1 WO 2012034410 A1 WO2012034410 A1 WO 2012034410A1 CN 2011074559 W CN2011074559 W CN 2011074559W WO 2012034410 A1 WO2012034410 A1 WO 2012034410A1
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WO
WIPO (PCT)
Prior art keywords
random access
mobile terminal
response
transmission delay
access response
Prior art date
Application number
PCT/CN2011/074559
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English (en)
Chinese (zh)
Inventor
褚丽莉
赵刚
马睿
Original Assignee
中兴通讯股份有限公司
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Filing date
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012034410A1 publication Critical patent/WO2012034410A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method for performing random access collision avoidance and a mobile terminal.
  • the Enhanced NodeB enhances the Node B for a certain preamble sequence when detecting the preamble (reamble) sent by the user. Make relevant tests in the detection window. If the correlation peak in the detection window exceeds a certain threshold, it is considered that the user uses the preamble sequence for random access. However, in an actual scenario, there may be multiple users simultaneously transmitting the same preamble sequence on the same Resource Block. Thus theoretically, Node B can detect multiple correlation peaks within the window of the preamble sequence.
  • the enhanced node B only performs a random access response to a correlation peak exceeding the threshold in the detection window, that is, the enhanced node detects the peak value exceeding the threshold in the detection window and returns the random access to the corresponding user. response.
  • the message 3 is sent according to the synchronization command and the scheduling information of the message 3 (message 3).
  • the disadvantage of the above process is that when multiple users send a preamble at the same time, the same message may be caused by multiple users simultaneously transmitting the same message 3 on the same time-frequency resource according to the same authorization.
  • the demodulation reliability of the message 3 of the user who responds really selected by the eNB is reduced, and the access time of the interfering user is prolonged, and the spectrum utilization rate is reduced.
  • the present invention provides a method for performing random access collision avoidance.
  • the method includes: the mobile terminal uses the downlink synchronization signal to estimate the downlink transmission delay of the downlink signal, and parses the uplink transmission delay carried in the random access response after receiving the random access response, according to the downlink transmission And delaying the uplink transmission delay to determine whether the random access response is a random access request in response to the mobile terminal, and if yes, sending a message 3, if not, reselecting the random access opportunity and initiating random access .
  • the step of determining whether the random access response is a random access request in response to the mobile terminal includes:
  • the mobile terminal determines the downlink transmission delay and the uplink after receiving the random access response. Whether the absolute value of the difference of the transmission delay is less than or equal to the first error value, and if the absolute value of the difference is less than or equal to the first error value, determining that the random access response is a random access request in response to the mobile terminal; If the absolute value of the difference is greater than the first error value, it is determined that the random access response is not a random access request in response to the mobile terminal.
  • the offset amount is the time offset compensation of the downlink transmission delay, where the mobile terminal modifies the synchronization adjustment amount and advances the downlink transmission delay when transmitting the preamble sequence.
  • the duration is transmitted by the preamble sequence.
  • the step of determining whether the random access response is a random access request in response to the mobile terminal further includes:
  • the mobile terminal determines a difference between the value of the downlink transmission delay and the uplink transmission delay. Whether the absolute value is less than or equal to the second error value, and if the absolute value of the difference is less than or equal to the second error value, determining that the random access response is a random access request in response to the mobile terminal; if the absolute value of the difference is If it is greater than the second error value, it is determined that the random access response is not in response to the random access request of the mobile terminal.
  • the first error value and the second error value are empirical values that cause the random access collision probability of the user to be lower than a preset threshold during the simulation.
  • the present invention also provides a random access collision avoidance method.
  • a mobile terminal the mobile terminal is configured to: estimate a downlink transmission delay of the downlink signal by using a downlink synchronization signal, and parse the uplink transmission delay carried in the random access response after receiving the random access response, according to the Determining whether the random access response is a random access request in response to the mobile terminal, and if yes, sending a message 3, if not, reselecting the random access opportunity and Initiate random access.
  • the mobile terminal is further configured to: when the preamble sequence is sent, perform a time offset compensation for the downlink transmission delay; and the mobile terminal is configured to determine whether the random access response is in response to the The random access request of the mobile terminal: if the time offset compensation is performed when the preamble sequence is sent, after the random access response is received, determining that the difference between the downlink transmission delay and the uplink transmission delay is absolute Whether the value is less than or equal to the first error value, and if the absolute value of the difference is less than or equal to the first error value, determining that the random access response is in response to the random access request of the mobile terminal; if the absolute value of the difference is greater than The first error value determines that the random access response is not a random access request in response to the mobile terminal.
  • the mobile terminal is configured to perform the time offset compensation by: modifying a synchronization adjustment amount when transmitting the preamble sequence and transmitting the preamble sequence in advance of a duration of the downlink transmission delay.
  • the mobile terminal is further configured to determine whether the random access response is a random access request in response to the mobile terminal by: if the time offset compensation is not performed when the preamble sequence is sent, the random access is received After the response, determining whether the absolute value of the difference between the value of the downlink transmission delay and the uplink transmission delay is less than or equal to the second error value, and if the absolute value of the difference is less than or equal to the second error value, determining The random access response is a random access request in response to the mobile terminal; if the absolute value of the difference is greater than the second error value, it is determined that the random access response is not in response to the random access request of the mobile terminal.
  • the first error value and the second error value are empirical values that cause the random access collision probability of the user to be lower than a preset threshold during the simulation.
  • the value of the uplink transmission delay is carried in a synchronization command word of the random access response.
  • the invention can reduce conflicts in the random access process, reduce random access time of users, and improve spectrum utilization.
  • FIG. 1 is a schematic diagram of a method for performing random access collision avoidance in an embodiment of the present invention
  • FIG. 2 is a schematic diagram showing the timing relationship between the user and the network when the user performs time offset compensation in the present invention
  • FIG. 3 is a schematic diagram showing the timing relationship when the user interacts with the network in the case where the user does not perform the time offset compensation in the present invention.
  • the mobile terminal performing the random access collision avoidance is configured to: use the downlink synchronization signal to estimate the downlink transmission delay of the downlink signal, and parse the uplink transmission delay carried in the random access response after receiving the random access response, Determining, according to the downlink transmission delay and the uplink transmission delay, whether the random access response is a random access request in response to the mobile terminal, and if yes, sending a message 3, if not, reselecting the random access Timing and initiate random access.
  • the value of the uplink transmission delay is carried in the synchronization command word in the random access response. If the mobile terminal performs the time offset compensation of the downlink transmission delay when transmitting the preamble sequence, the mobile terminal determines the downlink transmission delay and the uplink after receiving the random access response. Whether the absolute value of the difference of the transmission delay is less than or equal to the first error value, and if the absolute value of the difference is less than or equal to the first error value, determining that the random access response is a random access request in response to the mobile terminal; If the absolute value of the difference is greater than the first error value, it is determined that the random access response is not a random access request in response to the mobile terminal.
  • the time offset compensation performed by the mobile terminal when the preamble sequence is transmitted is the time delay of the downlink transmission delay, where the mobile terminal modifies the synchronization adjustment amount and advances the duration of the downlink transmission delay when transmitting the preamble sequence. Sending the preamble sequence.
  • the mobile terminal determines, after receiving the random access response, a difference between the value of the downlink transmission delay and the uplink transmission delay. Whether the absolute value of the value is less than or equal to the second error value, and if the absolute value of the difference is less than or equal to the second error value, determining that the random access response is in response to the random access request of the mobile terminal; If the value is greater than the second error value, determining that the random access response is not in response to the mobile terminal Random access request.
  • the first error value and the second error value are empirical values that cause the random access collision probability of the user to be lower than a preset threshold during the simulation.
  • a method for performing random access collision avoidance includes: a mobile terminal estimates a downlink transmission delay (tl) of a downlink signal by using a downlink synchronization signal, and parses the random after receiving a random access response. An uplink transmission delay (t2) carried in the access response, determining, according to the downlink transmission delay and the uplink transmission delay, whether the random access response is a random access request in response to the mobile terminal, and if so, Then, message 3 is sent, and if not, the random access opportunity is reselected and random access is initiated.
  • tl downlink transmission delay
  • t2 uplink transmission delay
  • the value of the uplink transmission delay is carried in the synchronization command word in the random access response. If the mobile terminal performs the time offset compensation of the downlink transmission delay when transmitting the preamble sequence, after receiving the random access response, the mobile terminal determines the downlink transmission delay and the uplink transmission. Whether the absolute value of the difference is less than or equal to the first error value ⁇ , if yes, ie Then determining that the random access response is in response to the random access request of the mobile terminal; if the absolute value of the difference is greater than, determining that the random access response is not in response to the random access request of the mobile terminal.
  • the time offset compensation performed by the mobile terminal when the preamble sequence is transmitted is the time delay of the downlink transmission delay, where the mobile terminal modifies the synchronization adjustment amount and advances the duration of the downlink transmission delay when transmitting the preamble sequence. Sending the preamble sequence.
  • the mobile terminal determines the difference between the double value of the downlink transmission delay and the uplink transmission delay after receiving the random access response. Whether the absolute value of the value is less than or equal to the second error value A 2 , and if so, And determining that the random access response is a random access request in response to the mobile terminal; if the absolute value of the difference is greater than ⁇ 2 , determining that the random access response is not in response to the random access request of the mobile terminal.
  • the delay of the uplink message carrying the preamble sequence includes only one-way delay.
  • the delay of the uplink message carrying the preamble sequence includes a two-way delay.
  • the first error value and the second error value ⁇ 2 are introduced as redundancy to ensure that false detections and missed detections do not occur.
  • the first error value A and the second error value ⁇ 2 are empirical values that cause the random access collision probability of the user to be lower than a preset threshold during the simulation.
  • Step S101 The user estimates the downlink transmission delay by using the downlink synchronization signal.
  • Step S102 After the user performs the time offset compensation of the duration, the random access preamble is sent.
  • step S104 the relationship between ⁇ and ⁇ is determined, and I - ⁇ 2
  • Step S105 The user sends the message 3 according to the authorization information of the random access response.
  • Step S201 The user estimates the downlink transmission delay by using the downlink synchronization signal.
  • Step S202 After the user performs the time offset compensation with the duration of ⁇ , the random access preamble is sent.
  • step S204 the relationship between ⁇ and ⁇ is judged, and ⁇ ⁇ is not satisfied.
  • step S205 After the user retreats, reselect the random access time and perform random access.
  • Step S301 The user estimates the downlink transmission delay ⁇ by using the downlink synchronization signal.
  • Step S302 The user does not perform time offset compensation, and sends a random access preamble.
  • Step S303 The user receives the random access response, and parses the uplink transmission delay in the random access response that belongs to itself. In step S304, the judgment and relationship satisfy
  • Step S401 The user estimates the downlink transmission delay by using the downlink synchronization signal.
  • Step S402 The user does not perform time offset compensation, and sends a random access preamble.
  • Step S403 The user receives the random access response, and parses the uplink transmission delay in the random access response that belongs to itself.
  • step S404 the relationship between ⁇ and ⁇ is determined, and
  • step S405 after the user retreats, the random access time is reselected and random access is performed.
  • the invention can reduce conflicts in the random access process, reduce random access time of users, and improve spectrum utilization.

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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 porte sur un procédé et un terminal mobile pour éviter un conflit d'accès aléatoire, le procédé comprenant les opérations suivantes : le terminal mobile estime le retard de transmission en liaison descendante d'un signal de liaison descendante à l'aide d'un signal de synchronisation de liaison descendante, et après réception d'une réponse d'accès aléatoire, analyse le retard de transmission en liaison montante contenu dans la réponse d'accès aléatoire, et détermine si la réponse d'accès aléatoire répond ou non à une requête d'accès aléatoire du terminal mobile, conformément au retard de transmission en liaison descendante et au retard de transmission en liaison montante, et si oui, envoie le message 3, et si non, resélectionne un instant d'accès aléatoire et relance l'accès aléatoire. La présente invention peut réduire le conflit d'accès dans le processus d'accès aléatoire et le temps d'accès aléatoire d'utilisateurs, et améliorer le taux d'utilisation du spectre.
PCT/CN2011/074559 2010-09-16 2011-05-24 Procédé et terminal mobile pour éviter un conflit d'accès aléatoire WO2012034410A1 (fr)

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Application Number Priority Date Filing Date Title
CN2010102873273A CN102404864A (zh) 2010-09-16 2010-09-16 进行随机接入冲突规避的方法及移动终端
CN201010287327.3 2010-09-16

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Cited By (2)

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CN103384173A (zh) * 2013-01-07 2013-11-06 沈阳远方计控系统有限公司 无线远传多频点集抄系统规避干扰信号的方法
CN106961713A (zh) * 2016-01-12 2017-07-18 中兴通讯股份有限公司 一种上行接入方法及终端和基站

Families Citing this family (2)

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CN106793150B (zh) * 2016-12-14 2020-01-07 北京小米移动软件有限公司 无线链路的建立方法及终端
CN110268795B (zh) * 2019-02-14 2023-05-02 北京小米移动软件有限公司 随机接入消息传输方法、装置及存储介质

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JP2008271137A (ja) * 2007-04-19 2008-11-06 Nippon Telegr & Teleph Corp <Ntt> 無線アクセスシステム、基地局装置および加入者局装置
CN101478780A (zh) * 2008-01-04 2009-07-08 中兴通讯股份有限公司 一种蜂窝通讯系统中随机接入的方法
CN101589566A (zh) * 2007-06-18 2009-11-25 Lg电子株式会社 在无线通信系统中执行上行链路同步的方法

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JP2008271137A (ja) * 2007-04-19 2008-11-06 Nippon Telegr & Teleph Corp <Ntt> 無線アクセスシステム、基地局装置および加入者局装置
CN101589566A (zh) * 2007-06-18 2009-11-25 Lg电子株式会社 在无线通信系统中执行上行链路同步的方法
CN101478780A (zh) * 2008-01-04 2009-07-08 中兴通讯股份有限公司 一种蜂窝通讯系统中随机接入的方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103384173A (zh) * 2013-01-07 2013-11-06 沈阳远方计控系统有限公司 无线远传多频点集抄系统规避干扰信号的方法
CN106961713A (zh) * 2016-01-12 2017-07-18 中兴通讯股份有限公司 一种上行接入方法及终端和基站
CN106961713B (zh) * 2016-01-12 2021-07-09 中兴通讯股份有限公司 一种上行接入方法及终端和基站

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