WO2012109929A1 - Procédé de réglage d'avance de temps lte et station de base - Google Patents

Procédé de réglage d'avance de temps lte et station de base Download PDF

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Publication number
WO2012109929A1
WO2012109929A1 PCT/CN2011/082214 CN2011082214W WO2012109929A1 WO 2012109929 A1 WO2012109929 A1 WO 2012109929A1 CN 2011082214 W CN2011082214 W CN 2011082214W WO 2012109929 A1 WO2012109929 A1 WO 2012109929A1
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WO
WIPO (PCT)
Prior art keywords
time
value
offset
advance adjustment
base station
Prior art date
Application number
PCT/CN2011/082214
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English (en)
Chinese (zh)
Inventor
余秋星
陈琼
Original Assignee
中兴通讯股份有限公司
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.)
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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 WO2012109929A1 publication Critical patent/WO2012109929A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to an LTE time advance adjustment method and a base station. Background technique
  • TA Time Advance
  • the eNodeB evolved NodeB
  • the UE User Equipment
  • the parameters In order to maintain the uplink synchronization, the eNodeB instructs the UE to send a DMRS (DeModulation Reference Signal) or a SRS (Sounding Reference Signal) at a specified time. After the timing measurement, the eNodeB passes the physical downlink shared channel.
  • the time advance adjustment command is sent to the UE for adjustment to maintain uplink synchronization between the UE and the eNodeB.
  • the time advance adjustment command is expressed in multiples of 16 times Ts (lTs is the basic time unit of LTE) with respect to the current uplink timing, and is controlled by the MAC (Medium/Media Access Control) control unit. Come and send.
  • the MAC control unit carries a 6-bit time advance adjustment command ⁇ to indicate the relative absolute adjustment amount N with respect to the current.
  • the base station In the prior art, the base station generally obtains a smoothed value according to the measured instantaneous value or based on the instantaneous value, and then notifies the UE to perform TA adjustment.
  • the uplink signal-to-noise ratio is relatively high, the problem is not large, but in the case of low SNR, the measured instantaneous value is easily affected by noise and interference, and even the measurement at the adjacent time is obtained. The result will fluctuate in a wide range, so the time advance adjustment based on the prior art will cause the base station to process the uplink received signal.
  • the FFT (Fast Fourier Transformation) window contains information of adjacent symbols and introduces ISI (Inter Symbol Interference), which greatly deteriorates the performance of the uplink demodulation signal. System throughput has decreased. Summary of the invention
  • the main object of the present invention is to provide a time adjustment method and base station for LTE to improve the accuracy and efficiency of time advance adjustment.
  • a time advance adjustment method for LTE including:
  • the base station starts a TA timer
  • the base station measures and records the time-offset instantaneous value of the target UE
  • the base station saves the latest time-offset instantaneous value and uses the average value as the effective time-offset value. Before the TA timer expires, the base station sends a time advance adjustment command according to the valid time-offset period, and restarts the TA timer.
  • the condition for starting the TA timer is: the UE completes the random access procedure, or the base station completes the delivery timing advance adjustment command.
  • the base station measures and records the time-offset instantaneous value of the target UE, and specifically includes: calculating the time according to the channel response phase difference between adjacent or separated subcarriers of the uplink demodulation reference signal DMRS or the sounding reference signal SRS.
  • the partial instantaneous value is obtained, or the time-offset instantaneous value is obtained according to the arrival time of the first path or the strongest path of the channel estimated by the DMRS or the SRS.
  • the base station adjusts the command according to the effective time offset period before the timeout of the TA timer, which specifically includes:
  • a time advance adjustment command 4C is generated, wherein when the effective offset value # minus the TA expected value 73 ⁇ 4 tarefrt is greater than 8, then the time Adjust the command in advance to 32; when valid, the offset value is ⁇ 4 minus When the TA expectation value 73 ⁇ 4 tagfrt is less than -8, the time advance adjustment command 23 ⁇ 4C is 30; when the value is valid in other cases, the time advance adjustment command ⁇ 4C is 31, or the time advance adjustment command is generated according to the formula:
  • rowm (.) represents a rounding operation
  • the invention also provides a base station, comprising:
  • a timer start unit configured to start a TA timer
  • a measurement recording unit configured to measure and record a time-offset instantaneous value of the target UE
  • the calculation processing unit is configured to save the latest time-offset instantaneous value and use the average value as the effective time offset value;
  • the adjustment command is sent to the pre-adjustment command according to the valid period offset period before the TA timer expires, and the TA timer is restarted.
  • the timer starting unit is configured to: start a TA timer when the UE completes the random access procedure, or the base station completes the delivery timing advance adjustment command.
  • the measurement recording unit is configured to: calculate the time-offset instantaneous value according to a channel response phase difference between adjacent or spaced subcarriers of the DMRS or the SRS, or estimate the first path of the channel according to the DMRS or the SRS Or the arrival time of the strongest path is the instantaneous value of the time offset.
  • the adjustment command issuing unit is further configured to: before the TA timer expires, generate a time advance adjustment command TAC according to the calculated valid time offset value 73 ⁇ 4 # and the TA expected value r4 ⁇ t , where, when valid When the time offset value 73 ⁇ 4 # minus the TA expectation value is greater than 8, the time advance adjustment command 73 ⁇ 4c is 32; when the effective offset value # minus the expected value r4 ⁇ t is less than -8, the time advance adjustment command 73 ⁇ 4c is 30; When the value is valid in other cases, the time advance adjustment command 4C is 31, or the time advance adjustment command is generated according to the formula:
  • the technical solution of the present invention has the following beneficial effects:
  • the LTE time adjustment method and the base station provided by the present invention use the current average value of multiple time-offset instantaneous values as the effective time-offset value of the target UE, and determine the target UE.
  • the pre-adjustment command can be used to improve the accuracy of the time-biased measurement, avoiding the inaccurate adjustment of the time caused by the measurement inaccuracy caused by the noise and interference of the time-biased measurement, and even causing the problem of uplink out-of-step, especially
  • the accuracy of time advance adjustment under low SNR is improved; flexible selection of multiple time-offset instantaneous values can greatly reduce the implementation complexity of time advance adjustment while ensuring accuracy; for discontinuous scheduling and continuous read scheduling
  • the reliability of the time adjustment of the situation can be solved and improved, and the adjustment precision and efficiency of the time advancement are greatly improved, thereby ultimately improving the system throughput.
  • FIG. 1 is a schematic flowchart of a method according to an embodiment of the present disclosure
  • FIG. 1 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the embodiment of the present invention provides a time advance adjustment method for LTE, where the steps of the method are implemented by a base station, as shown in FIG. 1, the method includes the following steps:
  • the base station starts the TA timer.
  • the condition for starting the TA timer is: the UE completes the random access procedure, or the base station completes the delivery timing advance adjustment command.
  • S120 The base station measures and records the time-offset instantaneous value of the target UE. In other embodiments, the S120 specifically includes:
  • time-offset instantaneous value Obtaining the time-offset instantaneous value according to a channel response phase difference between adjacent or spaced subcarriers of the DMRS or SRS, or estimating a first path or a strongest path of the channel according to DMRS or SRS (the strongest path is: power)
  • the arrival time of the largest diameter is obtained as the time-biased instantaneous value.
  • the base station saves the latest time-offset instantaneous value, and takes the average value as the effective time offset value; wherein, the selection of the time-shifted instantaneous value may be selected according to the signal-to-noise ratio or taken as a fixed value. If the signal-to-noise ratio is selected, the value is large when the signal-to-noise ratio is low, and the value is small when the signal-to-noise ratio is high.
  • S140 Before the TA timer expires, the base station sends a time advance adjustment command according to the valid time offset period, and restarts the TA timer. By repeating S120 ⁇ S140, the adjustment process of the next time advance adjustment period can be performed.
  • the S140 specifically includes:
  • 3 ⁇ 4 rget generating a time advance adjustment command 4C, wherein, when the valid offset value # minus the TA expectation value is greater than 8, the time advance adjustment command 73 ⁇ 4c is 32; when valid, the offset value is 73 ⁇ 4 # minus
  • the time advance adjustment command 73 ⁇ 4c is 30; when the deviation is valid in other cases, the time advance adjustment command 4C is 31, or the time advance adjustment command 73 ⁇ 4c is generated according to the formula, the formula is:
  • rowm (.) represents a rounding operation
  • the time adjustment method of the LTE uses the current average value of the plurality of time-offset instantaneous values as the effective time offset value of the target UE, and determines that the time advance adjustment command is sent to the target UE, which can improve the time offset measurement.
  • An embodiment of the present invention further provides a base station.
  • the base station includes:
  • the timer starting unit 210 is configured to start the TA timer. In other embodiments, the timer starting unit 210 is configured to complete the random access procedure in the UE, or the base station completes the scheduling advance adjustment command. Start the TA timer under the conditions.
  • the measurement recording unit 220 is configured to measure and record a time-offset instantaneous value of the target UE. In other embodiments, more specifically, the measurement recording unit 220 is configured to use between adjacent or separated subcarriers according to the DMRS or the SRS.
  • the time-shift instantaneous value is obtained by calculating the channel response phase difference, or the time-offset instantaneous value is obtained according to the arrival time of the first path or the strongest path of the channel estimated by the DMRS or the SRS.
  • the calculation processing unit 230 is configured to save the latest time offset instantaneous value, and use the average value as the effective time offset value;
  • the adjustment command issuing unit 240 is configured to: before the TA timer expires, issue a time advance adjustment command according to the valid time offset period, and restart the TA timer.
  • the adjustment command issuing unit 240 is further configured to generate a time advance adjustment command according to the calculated valid time offset value # and the TA expected value r4 ⁇ t before the TA timer expires. 4C , wherein, when the effective offset value # minus the TA expected value 73 ⁇ 4 target is greater than 8, the time advance adjustment command 4C is 32; when valid, the offset value 73 ⁇ 4 # minus the TA expectation value ⁇ gfrt is less than -8, then the time advance The adjustment command 4C is 30; when the value is other value when valid, the time advance adjustment command 4C is 31, or the time advance adjustment command TAC is generated according to the formula, and the formula is: Where rowm (.) represents a rounding operation.
  • the base station uses the current average value of multiple time-offset instantaneous values as the effective time offset value of the target UE, and determines the time advance adjustment command to be delivered to the target UE, which can improve the accuracy of the time-offset measurement and avoid Due to the influence of noise and interference caused by time-biased measurement, the time advance adjustment caused by measurement inaccuracy is inaccurate, and even the problem of uplink out-of-step is caused, especially the accuracy of time advance adjustment under low SNR is greatly improved; Selecting multiple time-offset instantaneous values can greatly reduce the implementation complexity of time advance adjustment while ensuring accuracy; the reliability of time advance adjustment for discontinuous scheduling and continuous read scheduling can be solved and improved. The adjustment accuracy and efficiency of the time advancement are greatly improved, thereby ultimately improving the system throughput.

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

Abstract

L'invention concerne un procédé de réglage d'avance de temps LTE et une station de base. La valeur moyenne d'une pluralité de valeurs instantanées de décalage de temps actuellement les plus nouvelles est utilisée comme valeur de décalage de temps effectif pour un UE cible, et l'émission d'une commande de réglage d'avance de temps à destination de l'UE cible est confirmée, ce qui améliore la précision de la mesure de décalage de temps et prévient les imprécisions dans le réglage d'avance de temps résultant d'une mesure imprécise à cause du bruit et des interférences présents durant la mesure de décalage de temps, et même le problème de la désynchronisation de liaison ascendante et, en particulier, cela améliore grandement la précision du réglage d'avance de temps en cas de faible rapport signal sur bruit. La pluralité de valeurs instantanées de décalage de temps est sélectionnée de manière flexible, ce qui réduit grandement la complexité de la mise en œuvre du réglage d'avance de temps tout en garantissant la précision. La fiabilité du réglage d'avance de temps dans les conditions de planification discontinue et de planification continue est résolue et améliorée dans les deux cas, ce qui améliore grandement la précision et l'efficacité du réglage d'avance de temps et aboutit à une augmentation du débit du système.
PCT/CN2011/082214 2011-02-17 2011-11-15 Procédé de réglage d'avance de temps lte et station de base WO2012109929A1 (fr)

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Application Number Priority Date Filing Date Title
CN2011100414696A CN102647781A (zh) 2011-02-17 2011-02-17 Lte的时间提前调整方法及基站
CN201110041469.6 2011-02-17

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WO2018065865A1 (fr) * 2016-10-05 2018-04-12 Reliance Jio Infocomm Limited Système et procédé d'identification et d'optimisation automatiques de cellules de dépassement

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CN109076470B (zh) 2016-05-03 2020-10-16 华为技术有限公司 信号传输方法、装置和系统
CN109995422A (zh) * 2018-01-02 2019-07-09 北京松果电子有限公司 上行同步方法、装置、存储介质及电子设备
CN108834211B (zh) * 2018-04-23 2020-07-07 中国科学院自动化研究所 一种基于5g通信网络的定时调整方法及系统
CN113115428B (zh) * 2020-01-10 2022-04-12 大唐移动通信设备有限公司 一种上行同步调整方法及装置
CN112867137B (zh) * 2021-01-14 2022-08-19 江苏亨鑫众联通信技术有限公司 一种上行同步方法和装置
CN114449645A (zh) * 2022-02-15 2022-05-06 赛特斯信息科技股份有限公司 一种多扩展单元小站定时提前调整方法

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