WO2015076480A1 - Procédé de synchronisation temporelle entre unités de communication et système associé - Google Patents

Procédé de synchronisation temporelle entre unités de communication et système associé Download PDF

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Publication number
WO2015076480A1
WO2015076480A1 PCT/KR2014/007591 KR2014007591W WO2015076480A1 WO 2015076480 A1 WO2015076480 A1 WO 2015076480A1 KR 2014007591 W KR2014007591 W KR 2014007591W WO 2015076480 A1 WO2015076480 A1 WO 2015076480A1
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WO
WIPO (PCT)
Prior art keywords
gps
gps signal
signal
unit
remote radio
Prior art date
Application number
PCT/KR2014/007591
Other languages
English (en)
Korean (ko)
Inventor
이종구
김권
김형호
이길수
Original Assignee
주식회사 쏠리드
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 주식회사 쏠리드 filed Critical 주식회사 쏠리드
Publication of WO2015076480A1 publication Critical patent/WO2015076480A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0644—External master-clock

Definitions

  • the present invention is a communication unit that can synchronize the time synchronization of another remote radio unit or base band unit (BBU) using a GPS signal acquired by any one remote radio unit (RRU).
  • BBU base band unit
  • RRU remote radio unit
  • a general base station In general, if a general base station is installed in an area of a relatively small number of subscribers compared to the number of subscribers covered by the base station, waste is generated. In such an area, a remote unit (RU) such as a repeater may be installed. The waste factor is eliminated beforehand.
  • RU remote unit
  • a communication relay system of an in-building system for accommodating a terminal in a shadow and a hearing loss area in a building is implemented including a main unit and a plurality of remote units for controlling the remote unit.
  • GPS time is used as a reference time to synchronize the time with the base station.
  • GPS signal reception is not smooth, satellite installation due to problems such as antenna installation and jamming, etc. If a GPS signal is not received from the mobile station, time synchronization cannot be performed, resulting in a service failure.
  • the present invention provides a method of synchronizing time between communication units that can synchronize the time of the base station using the GPS signal from the remote radio unit even when the main unit does not receive a GPS signal because the remote radio unit has a GPS antenna, and To provide that system.
  • the present invention is the automatic switching and GPS between different communication units to receive a normal GPS signal from another remote wireless unit, if any one of the GPS antenna does not operate normally due to GPS antenna installation problem, jamming problem, etc.
  • a method and system for synchronizing time between communication units, including a delay compensation function for synchronizing delays, are provided.
  • a remote radio unit including a GPS antenna and receiving a GPS signal from a satellite via the GPS antenna; And a communication unit connected to the remote radio unit by the optical path and receiving the GPS signal through the optical path for time synchronization.
  • the communication unit is a base band unit (BBU) or other remote radio unit, and the communication unit may be connected to a plurality of remote radio units via respective optical paths.
  • BBU base band unit
  • the base band unit the optical transceiver for receiving a GPS signal through the optical path;
  • a GPS module for measuring a ratio (C / N ratio) between a carrier level and a noise level of the GPS signal;
  • a controller configured to generate switching information for selecting a GPS signal having the best signal quality using the measured C / N ratio;
  • a delay compensator for equalizing a time delay with respect to the GPS signal and outputting one GPS signal according to the switching information;
  • a communication unit converting the GPS signal into an RF signal and transmitting the same to an adjacent base station.
  • the bass band unit may further include a switch for selectively switching any one of the GPS signals received through the optical transceiver according to the switching information to output to the GPS module.
  • a method for synchronizing time in a communication system comprising a plurality of remote radio units and a base band unit connected via an optical path, each of the plurality of remote radio units having a GPS antenna; Receiving a GPS signal via an optical path from the plurality of remote wireless units; And time synchronization using the GPS signal received through the optical path.
  • the step of synchronizing time comprises: measuring a ratio (C / N ratio) of a carrier level and a noise level for each of the received GPS signals; Generating switching information for selecting a GPS signal having the best signal quality using the measured C / N ratio; And equalizing the time delay with respect to the GPS signal and outputting one GPS signal to another adjacent base station according to the switching information.
  • the remote wireless unit since the remote wireless unit includes a GPS antenna, even when the main unit does not receive the GPS signal, the GPS signal from the remote wireless unit may be received. It is effective to synchronize the time synchronization of the base station.
  • any one of the GPS antennas do not operate normally due to GPS antenna installation problem, jamming (Jamming) problem, etc., it can be automatically switched to receive the normal GPS signal from another remote wireless unit. And, there is an effect that can compensate for the GPS delay between different communication units.
  • FIG. 1 is a diagram schematically illustrating a configuration of an RRU wireless base station system according to an embodiment of the present invention.
  • FIG. 2 is a block diagram of an internal configuration of an RRU in accordance with an embodiment of the present invention.
  • FIG. 3 is a block diagram of an internal configuration of a BBU according to an embodiment of the present invention.
  • FIG. 4 is a block diagram of an internal configuration of a delay compensation unit according to an embodiment of the present invention.
  • FIG. 5 is a block diagram of an internal configuration of a delay compensation unit according to another embodiment of the present invention.
  • FIG. 6 is an example of a flowchart illustrating a method of synchronizing time between communication units in the case of FIG.
  • one component when one component is referred to as “connected” or “connected” with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.
  • the time synchronization of the baseband unit (BBU, hereinafter abbreviated as BBU) is performed based on a GPS signal obtained by additionally installing a GPS antenna in at least one remote radio unit (hereinafter referred to as RRU).
  • RRU remote radio unit
  • FIG. 1 is a view schematically showing the configuration of an RRU wireless base station system according to an embodiment of the present invention
  • FIG. 2 is a block diagram of an internal configuration of an RRU according to an embodiment of the present invention
  • the RRU wireless base station system 100 may include a plurality of RRUs 110 and one BBU 120.
  • the plurality of RRUs 110 and the BBU 120 may be connected by optical paths.
  • the RRUs 110 are installed at different locations and are means for transmitting and receiving radio signals under the control of the BBU 120.
  • the RRU 110 may include a GPS antenna 210, an RF unit 215, and an optical transceiver 220.
  • the block diagram of FIG. 2 shows only the configuration related to the embodiment of the present invention, and the original function of the RRU (that is, the function for providing RF service in relation to the terminal in the service area, that is, the RF antenna, etc.) It should be clearly clarified that the related elements are omitted.
  • the GPS antenna 210 is a means for receiving GPS signals from satellites.
  • the RF unit 215 amplifies the GPS signal received through the GPS antenna 210 to output to the optical transmitter 220. It is apparent that the RF unit 215 also performs a function of processing a terminal signal received from an RF antenna (not shown) or a service signal to be serviced to the terminal through the RF antenna.
  • the optical transceiver 220 is a means for converting the GPS signal converted through the RF unit 215 into an optical signal and outputting the optical signal to the BBU 120 through an optical path.
  • the optical transceiver 220 may receive an optical signal from the BBU 120, convert the optical signal into an RF signal, and transmit the RF signal to at least one terminal (not shown).
  • each RRU 110 receives the GPS signal from the satellite via the GPS antenna 210, and then to the RRU 110 or BBU 120 at another location connected via the optical path Can transmit
  • the BBU 120 is connected to each of the plurality of RRUs 110 by optical paths, and receives the GPS signals obtained from the RRU 110 through the optical paths to synchronize the time.
  • the BBU 120 may include an optical transceiver 310, a switch 315, a GPS module 320, a delay compensator 325, a communication unit 330, and a controller ( 335).
  • the optical transceiver 310 is a means for receiving the optically transmitted GPS signal received from the RRU (110).
  • the optical transceiver 310 may separate and output a plurality of optically transmitted GPS signals received from the plurality of RRUs 110.
  • the switch unit 315 is a means for switching any one of the plurality of GPS signals separated through the optical transceiver 310 under the control of the controller 335.
  • the switch unit 315 may be any one of a plurality of GPS signals separated through the optical transceiver 310 according to the control of the controller 335 (that is, according to switching information input through the controller 335). May be selectively output to the GPS module 320.
  • the GPS module 320 tracks and synchronizes an input GPS signal transferred through the switch unit 315.
  • the GPS module 320 measures and outputs the ratio (C / N ratio) between the carrier level and the noise level of the GPS signal, which is transferred and switched through the switch unit 315.
  • the delay compensator 325 equalizes the delays of the plurality of GPS signals separated by the optical transceiver 310, and then outputs the switched GPS signals under the control of the controller 335.
  • the BBU 120 receives GPS signals from the RRUs 110 located at different locations, and at this time, the distance between each RRU 110 and the BBU 120 (that is, the length of each optical path) is different, and thus a plurality of received GPS signals are received. Different time delays occur between the GPS signals. As such, when GPS signals having different delay times are transferred to the normal path, the GPS service may be momentarily disconnected. Therefore, to compensate for the symptom of the GPS signal being cut off due to different delays during GPS switching, it is necessary to equalize the delay of the GPS signal, and the delay compensator 325 performs delay equalization (compensation) of the GPS signal.
  • the delay compensator 325 down-converts the plurality of GPS signals separated by the optical transceiver 310 into IF signals, converts them into digital signals, and then converts the GPS signals of the different GPS signals based on the maximum length of the optical paths. Delay can be synchronized. Subsequently, the delay compensator 325 may up-convert and output the GPS signal according to the switching information input from the controller 335.
  • the detailed configuration of the delay compensation unit 325 will be described in detail with reference to FIGS. 4 and 5 to be described later.
  • the communication unit 330 is a means for transmitting the GPS signal, which is transferred through the delay compensator 325 and output, to another adjacent base station (not shown). This allows time synchronization between communication units.
  • the controller 335 is an internal component of the BBU 120 according to an embodiment of the present invention (for example, the optical transceiver 310, the switch 315, the GPS module 320, and the delay compensator 325). ), The communication unit 330, etc.).
  • control unit 335 generates switching information for selecting the GPS signal having the highest signal quality using the C / N ratio input through the GPS module 320 to switch unit 315 and delay compensation unit 325. You can also output This will be described in detail with reference to FIG. 6 to be described later.
  • FIG. 4 is a block diagram of an internal configuration of a delay compensation unit according to an embodiment of the present invention
  • FIG. 5 is a block diagram of an internal configuration of a delay compensation unit according to another embodiment of the present invention.
  • the delay compensator 325 may be implemented in a digital manner as shown in FIG. 4 or an analog manner as shown in FIG. 5 according to an exemplary embodiment of the present invention.
  • the delay compensator 325 may include a plurality of down converters 410, a plurality of ADCs 415, an FPGA 420, a DAC 425, and an up converter 430. Can be.
  • the down converter 410 is a means for down converting the GPS signal separated through the optical transceiver 310 into an IF signal for digital signal processing. Although not clearly shown in FIG. 4, a separate configuration for converting a plurality of GPS signals output by the optical transceiver 310 into an RF signal may be further included in the rear of the optical transceiver 310.
  • the plurality of ADCs 415 are means for converting an analog GPS signal into a digital signal and outputting the digital signal.
  • the FPGA 420 equalizes the delay of the GPS signal having a different time delay in a digital form output through each ADC 415 based on the maximum length of the optical path, and then selects any one according to the switching information of the controller 335. Means for outputting a GPS signal.
  • Only the GPS signal having the best signal quality can be selectively output according to the switching information, thereby solving the duplication problem of receiving a plurality of GPS signals.
  • a GPS signal instead of receiving a GPS signal through one GPS antenna, a plurality of GPS signals are received through a plurality of GPS antennas, and therefore, any one of the GPS antennas is caused by problems such as a GPS antenna problem and jamming. If the GPS signal is not normally received from the satellite, there is an advantage in that the GPS service can be provided without interruption by automatically switching to select a GPS antenna that is normally operated.
  • the DAC 425 is a means for converting a GPS signal in digital form into an analog signal.
  • the up converter 430 is a means for up-converting and outputting an analog IF signal (GPS signal).
  • the delay compensator 325 includes a plurality of down converters 410, a plurality of analog time compensators 416 and 417, an analog switch 418, and an up converter 430. It may include.
  • the down converter 410 is a means for down converting the GPS signal separated through the optical transceiver 310 into an IF signal for digital signal processing.
  • the plurality of analog time compensators 416 and 417 equalize the delays of GPS signals having different time delays with respect to the optical path having the maximum length.
  • the analog switch 418 is a means for outputting any one GPS signal according to the switching information of the control unit 335. According to this switching information, only the GPS signal having the best signal quality can be selectively output, thereby solving the duplication problem of receiving a plurality of GPS signals.
  • the up converter is a means for up-converting and outputting an analog IF signal (GPS signal).
  • FIG. 6 is an example of a flowchart illustrating a method of synchronizing time between communication units in the case of FIG. 1.
  • one BBU 120 is connected to a plurality of RRUs 110 through different optical paths, and each RRU 110 will be described with respect to a time synchronization at a base station including a GPS antenna. .
  • the BBU 120 receives GPS signals from a plurality of RRUs 110 connected through respective optical paths.
  • step 515 the BBU 120 measures the C / N ratio for each GPS signal received from each RRU 110.
  • the BBU 120 may select one GPS signal received from each RRU 110 to measure the C / N ratio.
  • the BBU 120 In operation 520, the BBU 120 generates switching information for selecting a GPS signal having the best signal quality using the measured C / N ratio of each GPS signal.
  • the BBU 120 equalizes the time delay for each GPS signal received from the plurality of RRUs 110 through the optical path, and then outputs one GPS signal to another adjacent base station according to the switching information. As a result, the BBU 120 may synchronize time with other adjacent base stations.
  • Computer-readable recording media include all kinds of recording media having data stored thereon that can be decrypted by a computer system.
  • ROM read only memory
  • RAM random access memory
  • magnetic tape magnetic tape
  • magnetic disk magnetic disk
  • flash memory an optical data storage device
  • the computer readable recording medium can also be distributed over computer systems connected over a computer network, stored and executed as readable code in a distributed fashion.

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

Abstract

L'invention concerne un système de synchronisation temporelle entre des unités de communication, comportant: une unité radio distante (RRU) qui comporte une antenne GPS et qui reçoit un signal GPS en provenance d'un satellite via l'antenne GPS; et une unité de communication qui est reliée à l'unité radio distante par une ligne optique et qui effectue une synchronisation temporelle en recevant le signal GPS via la ligne optique.
PCT/KR2014/007591 2013-11-19 2014-08-14 Procédé de synchronisation temporelle entre unités de communication et système associé WO2015076480A1 (fr)

Applications Claiming Priority (2)

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KR10-2013-0140412 2013-11-19
KR1020130140412A KR101631648B1 (ko) 2013-11-19 2013-11-19 통신 유닛 간 시각 동기화 방법 및 그 시스템

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CN109687899A (zh) * 2019-01-16 2019-04-26 武汉虹信通信技术有限责任公司 在扩展型皮基站上传输卫星同步信号的方法
EP3393077A4 (fr) * 2015-12-18 2019-09-11 Solid, Inc. Procédé et appareil pour compenser le retard de transmission optique
CN111327362A (zh) * 2018-12-13 2020-06-23 大唐移动通信设备有限公司 光路补偿系统、方法及基站

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CN114828202A (zh) * 2022-07-01 2022-07-29 深圳国人无线通信有限公司 一种基站空口同步对齐的方法及系统

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US20030011514A1 (en) * 2001-07-11 2003-01-16 Richard Kirchofer Interference rejection GPS antenna system
WO2006007762A1 (fr) * 2004-07-21 2006-01-26 Utstarcom Telecom Co., Ltd. Architecture extensible de systeme de station de base centralise
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WO2006007762A1 (fr) * 2004-07-21 2006-01-26 Utstarcom Telecom Co., Ltd. Architecture extensible de systeme de station de base centralise
US20110158332A1 (en) * 2005-01-12 2011-06-30 Huawei Technologies Co., Ltd. Distributed Base Station System and Method for Networking thereof and Base Band Unit
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Publication number Priority date Publication date Assignee Title
EP3393077A4 (fr) * 2015-12-18 2019-09-11 Solid, Inc. Procédé et appareil pour compenser le retard de transmission optique
US10581520B2 (en) 2015-12-18 2020-03-03 Solid, Inc. Apparatus and method for compensating optical transmission delay
US10887008B2 (en) 2015-12-18 2021-01-05 Solid. Inc. Apparatus and method for compensating optical transmission delay
CN111327362A (zh) * 2018-12-13 2020-06-23 大唐移动通信设备有限公司 光路补偿系统、方法及基站
CN111327362B (zh) * 2018-12-13 2021-06-22 大唐移动通信设备有限公司 光路补偿系统、方法及基站
CN109687899A (zh) * 2019-01-16 2019-04-26 武汉虹信通信技术有限责任公司 在扩展型皮基站上传输卫星同步信号的方法
CN109687899B (zh) * 2019-01-16 2021-10-22 武汉虹信科技发展有限责任公司 在扩展型皮基站上传输卫星同步信号的方法

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KR20150057281A (ko) 2015-05-28

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