WO2014101217A1 - Système de réseau et dispositif de réseau basés sur un point de fréquence de canal bcch commun - Google Patents

Système de réseau et dispositif de réseau basés sur un point de fréquence de canal bcch commun Download PDF

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Publication number
WO2014101217A1
WO2014101217A1 PCT/CN2012/088108 CN2012088108W WO2014101217A1 WO 2014101217 A1 WO2014101217 A1 WO 2014101217A1 CN 2012088108 W CN2012088108 W CN 2012088108W WO 2014101217 A1 WO2014101217 A1 WO 2014101217A1
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WO
WIPO (PCT)
Prior art keywords
base station
baseband processing
processing unit
group
information
Prior art date
Application number
PCT/CN2012/088108
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English (en)
Chinese (zh)
Inventor
刘敬全
王志伟
杨静
冯振杰
Original Assignee
华为技术有限公司
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.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2012/088108 priority Critical patent/WO2014101217A1/fr
Priority to CN201280002801.0A priority patent/CN103250443B/zh
Publication of WO2014101217A1 publication Critical patent/WO2014101217A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the embodiments of the present invention relate to the field of wireless communications, and more specifically, to a networking system and a network device based on a frequency of a broadcast control channel (Broadcast Control Channel, hereinafter referred to as "BCCH").
  • BCCH Broadcast Control Channel
  • GSM Global System for Mobile communications
  • the existing scheme for saving the BCCH frequency point is to make the radio remote unit under the same base station
  • Radio Frequency Unit transmits the same BCCH frequency information, and evolves the normal three sectors with three sectors and one sector using one BCCH frequency point.
  • RRU Radio Remote Unit
  • RU Radio Frequency Unit
  • the embodiment of the invention provides a system and a network device for sharing a BCCH frequency point network, which can save the BCCH frequency.
  • a system for sharing a BCCH frequency point network comprising: at least three base station groups, one of the base station groups being composed of at least two base stations, each of the base stations in the base station group using the same The BCCH frequency, the adjacent base station group uses different BCCH frequency points; at least one base station controller, the base station controller communicates with the base station in the base station group.
  • each base station in the base station group includes a baseband processing unit BBU, and further includes Containing at least one radio remote unit RRU or at least one radio unit RFU.
  • the method when the downlink data is sent, includes: configuring the one of the base stations in each of the base station groups
  • the baseband processing unit receives the information sent by the base station controller, and the specified baseband processing unit sends the information sent by the controller to each baseband processing unit of another base station in the same base station group, and each of the other base stations in the same base station group
  • the baseband processing unit then transmits the information to the RRU or RFU to which the respective connection is connected; or the baseband processing unit in each of the base stations receives system information transmitted by the base station controller, and the baseband processing unit transmits the information to each The RRU or RFU to which the baseband processing unit is connected.
  • the method when the uplink data is sent, the method includes: The baseband processing unit receives information transmitted by the RRU or RFU connected to the baseband processing unit, and each of the baseband processing units transmits the received information to a designated one of the base station groups of the base station where the baseband processing unit is located. a baseband processing unit in the base station, wherein the baseband processing unit of the designated base station transmits the received information to the base station controller; or the baseband processing unit in each of the base stations in the base station group receives Information transmitted by the RRU or RFU connected to the baseband processing unit, each of the baseband processing units transmitting the received information to the base station controller.
  • a base station in a second aspect, is provided, the base station using a BCCH frequency point; the base station and at least one base station adjacent to the base station use the same BCCH frequency point as the base station.
  • the base station and the base station using the same BCCH frequency and the neighboring base station are synchronized with the base station.
  • the base station in combination with the second aspect or the first possible implementation manner of the second aspect, includes a baseband processing unit BBU, and further includes at least one radio remote unit RRU or at least one radio unit RFU.
  • the base station in combination with the second aspect or the first or second possible implementation of the second aspect, communicates with the base station controller.
  • a base station group is provided, the base station group being constituted by at least two base stations in the first to third possible implementations of the second aspect or the second aspect.
  • the base station group communicates with the base station controller, including: when the downlink data is sent, the baseband processing unit in the designated one of the base stations in the base station group receives the information sent by the base station controller, by the designated baseband processing unit Transmitting the information sent by the controller to each baseband processing unit of another base station in the same base station group, and each baseband processing unit of the other base stations in the same base station group sends the information to the RRU or RFU connected to each other; or each The baseband processing unit in the base station receives the system information sent by the base station controller, and the baseband processing unit sends the information to the RRU or the RFU connected to each of the baseband processing units; when the uplink data is sent, the method includes: The baseband processing unit in each of the base stations in the base station group receives information transmitted by the RRU or RFU
  • the baseband processing unit of the base station transmits the received information to the base station controller; or the baseband processing unit in each of the base stations in the base station group receives the RRU or RFU connected to the baseband processing unit
  • the transmitted information, each of the baseband processing units transmits the received information to the base station controller.
  • a base station controller performs connection communication with the base station in the first to third possible implementation manners of the second aspect or the second aspect; or
  • the base station group in the aspect or the first or second possible implementation manner of the third aspect performs connection communication.
  • the fifth aspect provides a baseband processing unit, including: a receiving module, configured to receive information sent by an RRU or an RFU in the baseband processing unit where the receiving module is located, and to receive information sent by the base station controller. And being used for receiving information sent by another baseband processing unit; the sending module is configured to send information to the RRU or the RFU in the baseband processing unit where the sending module is located, and is further configured to send a message to the base station controller, Used to send information to other baseband processing units.
  • the baseband processing unit is located in the base station in any of the first to fourth aspects and any one of the first to fourth aspects.
  • a plurality of base stations form a base station group, and multiple base station groups use different BCCH frequency points, the maximum range saves the BCCH frequency point, and because the same BCCH frequency point is used in a wider range, The interference of the same frequency and adjacent frequency is further reduced.
  • FIG. 1 is a schematic diagram of networking of a shared BCCH frequency point according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of networking of multiple base station groups of a base station group in which three base stations form one base station group according to an embodiment of the present invention
  • FIG. 3 is a communication flowchart of a base station group and a base station controller in which three base stations constitute one base station group according to an embodiment of the present invention
  • FIG. 4 is a further communication flowchart of a base station group and a base station controller in which three base stations constitute one base station group according to an embodiment of the present invention
  • FIG. 5 is a schematic block diagram of a baseband processing unit according to an embodiment of the present invention.
  • FIG. 6 is a schematic block diagram of a baseband processing unit in accordance with another embodiment of the present invention. detailed description
  • FIG. 1 shows a schematic diagram of a networking system that shares BCCH frequencies in accordance with an embodiment of the present invention.
  • the networking system includes:
  • At least three base station groups one of which is composed of at least two base stations, each of the base stations in the base station group uses the same BCCH frequency point, and the adjacent base station group uses different BCCH frequency points;
  • At least one base station controller the base station controller in communication with the base station in the base station group.
  • a plurality of base stations form a base station group, and multiple base station groups use different BCCH frequency points, the maximum range saves the BCCH frequency point, and because the same BCCH frequency point is used in a wider range, Further, the effect of reducing interference of the same frequency and adjacent frequency is achieved.
  • the system includes at least three base station groups, and the base station group is not a separate network.
  • the base station group is composed of a plurality of base stations, is a type of packet division for multiple base stations, and each base station group is composed of how many base stations, depending on the number of existing BCCH frequency resources and the need to achieve the saved BCCH frequency.
  • the effect is that BCCH frequency resources are extremely scarce, or when more BCCH frequency points are needed, each base station group is composed of more base stations; BCCH frequency resources are relatively scarce, or less BCCH frequency points need to be saved.
  • each base station group is composed of fewer base stations.
  • a networking system a plurality of base station groups are included, and the number of base station groups in one system is determined by the range to be covered by the networking and the number of base stations constituting each base station group. Within a certain networking range, the coverage of each base station is determined, so the number of base stations is also determined. Then, when the number of base stations constituting each base station group is determined as needed, the number of base station groups is also determined within a certain network range.
  • All base stations in each base station group use the same BCCH frequency point, that is, the sectors covered by each base station in each base station group use the same BCCH frequency point, and each base station also uses the same BCCH frequency point, one base station All sectors in the group use the same BCCH frequency.
  • Adjacent base station groups use different BCCH frequencies. Within a certain network range, the number of base station groups can be determined. The allocation of the BCCH frequency is determined according to the number of BCCH frequencies used. The allocation of BCCH frequencies refers specifically to how many base station groups share a BCCH frequency. Within a certain network range, there are a certain number of available BCCH frequencies, and the number of base station groups is also determined.
  • each base station group uses different BCCH frequency points, that is, adjacent base station groups use different BCCH frequencies. Point;
  • the number of networking ranges and the number of BCCH frequencies determines that one BCCH frequency point needs to be used by multiple base station groups, when the BCCH frequency is allocated, the same base station group cannot use the same BCCH frequency.
  • the number of base station controllers is at least one, and one base station controller and multiple sets of base stations perform connection communication.
  • the number of base station controllers is determined according to the network coverage and other networking requirements.
  • the base station controller and all the base station groups perform connection communication; when the networking system has two or more base station controllers, each base station controller can be allocated according to requirements. A group of base stations connected to the communication.
  • synchronization is maintained between all base stations in each of the base station groups.
  • synchronization is maintained between all base stations in each base station group.
  • GPS Global Position System
  • the GPS clock system on the base station side of the GPS positioning device receives the information transmitted by the GPS satellite, obtains the pulse signal with the progress of 1PPS and the absolute time of the GPS; the base station clock circuit tracks the signal of the 1PPS to obtain the reference clock, and obtains more signals based on the reference clock.
  • the base station in each network adjusts the frame number according to the absolute number of frames, and the absolute frame number is obtained by the GPS absolute time estimation received by the base station.
  • airlink soft synchronization techniques can be used to maintain synchronization between all base stations within each base station group.
  • the frame number is adjusted by collecting the frame offset information calculated by the mobile station during the asynchronous handover, and the base station under the same base station controller is synchronized by using the slot number and the bit offset between the slots.
  • each base station in each base station group may include one baseband processing unit, and optionally, only one radio remote unit RRU or at least one radio frequency unit RFU, where the RRU or RFU mainly completes the intermediate frequency of the signal.
  • Processing such as digital I / Q modulation and demodulation, up and down frequency conversion, digital analog signal conversion, RF processing, duplex and other functions.
  • the base station controller communicates with the base station in the base station group, including: when downlink data is transmitted,
  • the baseband processing unit in the designated one of the base stations in each base station receives the information sent by the base station controller, and the information sent by the controller is sent by the designated baseband processing unit to each baseband processing unit of the other base stations in the same base station group.
  • the baseband processing units of other base stations in the same base station group then send information to the respective connected RRUs or RFUs.
  • the baseband processing unit in each base station receives system information sent by the base station controller, and the baseband processing unit sends the information to the RRU or RFU connected to each baseband processing unit.
  • the base station controller communicates with the base station in the base station group, including: when uplink data is transmitted,
  • the baseband processing unit in each base station in each base station group receives information sent by the RRU or RFU connected to the baseband processing unit, and each baseband processing unit sends the received information to the base station where the baseband processing unit is located.
  • the baseband processing unit in one of the designated base stations in the associated base station group transmits the received information to the base station controller by the baseband processing unit of the designated base station.
  • the baseband processing unit in each base station in each base station group receives information sent by the RRU or RFU connected to the baseband processing unit, and each baseband processing unit transmits the received information to the base station controller.
  • the designated baseband processing unit may optionally be in a base station group. Specify any baseband processing unit as the designated baseband processing unit.
  • the uplink data may include information such as level, power, TA value, and receiving angle.
  • the downlink data may include system information and the like.
  • FIG. 2 is a network diagram of a base station group in a shared BCCH frequency point system, where the system is composed of one base station controller, as shown in FIG. 2, and 20 networking systems are also provided.
  • the base station group is configured such that each small circle and three surrounding areas of the same pattern are enough to cover an area covered by a base station, and the area covered by the base station adjacent to the same pattern constitutes an area covered by a base station group;
  • the base station group is composed of three base stations; as shown in FIG.
  • all the cells covered by each of the three base station groups form a cluster, and the three base station groups are three base station groups with the same pattern in the figure, and each base station group in the cluster
  • the covered cells share one BCCH frequency point
  • each of the three base station groups in each cluster uses three BCCH frequency points
  • the three BCCH frequency points constitute one frequency point set, and the same frequency point set is used between the cluster and the cluster. That is, all the cells covered by the 60 base stations use a total of three BCCH frequency points, and the cells covered by the three base stations in each cluster respectively use the three different BCCH frequency points, and the same frequency point set is used between the cluster and the cluster.
  • the baseband processing unit in the base station corresponding to any cell in each base station group serves as a designated base station control unit.
  • the designated baseband processing unit is configured to receive system broadcast information or service information sent by the base station controller, and the designated baseband processing unit forwards to the other two baseband processing in the base station used by the other group in the same group.
  • each baseband processing unit receives the information forwarded by the designated baseband processing unit, and then forwards the information to the RRUs connected to each other; when the uplink data is transmitted, the baseband processing units in all the base stations in each group of base stations receive the RRUs sent by the connected RRUs.
  • the uplink data information is forwarded to the designated base station control unit in each group, and the designated baseband processing unit in each group of base stations receives uplink data information forwarded by other baseband processing units in the same group, and then the designated baseband processing unit will The uplink data information is forwarded to the base station controller.
  • the uplink data information includes information such as level, power, TA value, and reception angle.
  • the base station group is created, so that all the base stations in the base station group use the same BCCH frequency point, and the same anti-interference effect as the embodiment is required, compared with the existing technology for saving the BCCH frequency point.
  • the BCCH frequency point is used in the embodiment of the present invention. Therefore, the embodiment of the present invention achieves the effect of saving the BCCH frequency.
  • the embodiment of the present invention reduces the same frequency and adjacent frequency interference, and does not use the base station group structure in this embodiment.
  • a single BCCH frequency point covers a larger range, and the number of interference sources per unit area.
  • the embodiment of the present invention also effectively reduces the same frequency and adjacent frequency interference of the BCCH frequency network.
  • a base station uses a BCCH frequency point, and the base station and at least one base station adjacent to the base station use the same BCCH frequency point as the base station.
  • all the cells covered by the base station use one BCCH channel, and at least one of the base stations adjacent to the base station of the base station uses the same BCCH channel as the base station.
  • the base station is synchronized with a base station adjacent to the base station and using the same BCCH frequency point as the base station.
  • the global positioning system (GPS) clock synchronization method may be used to keep the base stations synchronized, and the GPS positioning system on the base station side of the GPS positioning device is configured in the communication network to receive the information sent by the GPS satellites.
  • the base station clock circuit tracks the signal of the 1PPS to obtain a reference clock, and obtains more signals based on the reference clock;
  • the base station in each network adjusts the frame number according to the absolute number of frames, The absolute number of frames is obtained from the GPS absolute time estimate received by the base station.
  • the air interface soft synchronization technique can be used to keep the base stations synchronized.
  • the frame number is adjusted by collecting the frame offset information calculated by the mobile station during the asynchronous handover, and the slot number between the time slot and the time slot is used to achieve the synchronization effect of the base station under the same base station controller.
  • the base station may include a BBU baseband processing unit, and optionally, at least one RRU or at least one RFU.
  • the base station in the embodiment of the present invention can implement the functions of the base station in the system embodiment of the present invention sharing the BCCH frequency.
  • the cell covered by the base station uses the same BCCH frequency point, and the same BCCH frequency point is used by the base station adjacent to the base station, so that the same BCCH frequency point covers a larger range, so that The BCCH frequency is saved within a fixed network range.
  • a base station group is provided, which is composed of at least two base stations in the base station embodiment provided by the present invention.
  • the base station group is not a single network device.
  • the base station group is composed of multiple base stations. It is a kind of packet division for multiple base stations. How many base stations are formed by each base station group depends on the number of existing BCCH frequency resources and The effect of saving the BCCH frequency, the BCCH frequency resource is extremely scarce, or the need to save more BCCH frequency, then each base station group is composed of more base stations; BCCH frequency resources are relatively scarce, or need Save less BCCH frequency, then every The base station group consists of fewer base stations.
  • synchronization is maintained between all base stations in the base station group.
  • a Global Position System (GPS) clock synchronization method may be used to synchronize all base stations in the base station group, and a GPS positioning system on the base station side of the GPS positioning device is configured in the communication network.
  • the information transmitted by the GPS satellite obtains the pulse signal of the progress of 1PPS and the absolute time of the GPS; the base station clock circuit tracks the signal of the 1PPS to obtain the reference clock, and obtains more signals based on the reference clock; the base station in each network is based on the absolute frame The number is adjusted by the frame number, and the absolute number of frames is obtained by the GPS absolute time estimation received by the base station.
  • air interface soft synchronization techniques can be used to maintain synchronization between all base stations within the base station group.
  • the frame number is adjusted by collecting the frame offset information calculated by the mobile station during the asynchronous handover, and the slot number and the bit offset between the slots are used to achieve the synchronization effect of the base station under the same base station controller.
  • FIG. 3 and FIG. 4 a communication diagram of a base station group composed of three base stations is shown.
  • a baseband processing unit in FIG. 3 and FIG. 4 is connected to the baseband processing unit.
  • the three RRUs/RFUs form a base station and the BSC is a base station controller.
  • the base station controller communicates with the base station in the base station group, including: when downlink data is transmitted,
  • the baseband processing unit in the designated one base station in each base station group receives the information sent by the base station controller, and the information sent by the controller is sent by the designated baseband processing unit to the other base station group.
  • Each baseband processing unit of the base station, and each baseband processing unit of other base stations in the same base station group sends information to the respective connected RRU or RFU.
  • the baseband processing unit in each base station receives system information transmitted by the base station controller, and the baseband processing unit transmits the information to the RRU or RFU to which each baseband processing unit is connected.
  • the base station controller communicates with the base station in the base station group, including: when uplink data is transmitted,
  • the baseband processing unit in each base station in each base station group receives information sent by the RRU or RFU connected to the baseband processing unit, and each baseband processing unit sends the received information.
  • the baseband processing unit in one of the designated base stations in the group of the base station to which the baseband processing unit is located is sent to the base station controller by the baseband processing unit of the designated base station.
  • the baseband processing unit in each base station in each base station group receives information sent by the RRU or RFU connected to the baseband processing unit, and each baseband processing unit sends the received information. Give the base station controller.
  • the designated baseband processing unit may optionally specify any one of the baseband processing units as a designated baseband processing unit in one base station group.
  • the cells covered by the base station group use the same BCCH frequency point, so that the same BCCH frequency point covers a larger range, so that the BCCH frequency point is saved within a fixed networking range.
  • FIG. 5 shows a schematic block diagram of a baseband processing unit in accordance with an embodiment of the present invention.
  • the baseband processing unit includes:
  • a receiving module configured to receive information sent by an RRU or an RFU in the baseband processing unit where the receiving module is located, to receive information sent by the base station controller, and to receive information sent by another baseband processing unit;
  • a sending module configured to send information to the RRU or RFU in the baseband processing unit where the sending module is located, to send a message to the base station controller, and to send information to other baseband processing units.
  • the baseband processing unit may be located in a base station in an embodiment of the system of the invention or in a base station embodiment or a base station group embodiment.
  • the baseband processor can communicate with other base stations in addition to communicating with the base station controller, so that the base station where the baseband processor is located can communicate with other base stations, so that different base stations are configured to use the same.
  • the base station group of the BCCH frequency thus saves the BCCH frequency.
  • FIG. 6 shows a schematic block diagram of a baseband processing unit in accordance with an embodiment of the present invention.
  • the baseband processing unit includes:
  • a receiver configured to receive information sent by an RRU or an RFU in the baseband processing unit where the receiver is located, to receive information sent by the base station controller, and to receive information sent by other baseband processing units;
  • a transmitter configured to send information to the RRU or RFU in the baseband processing unit where the transmitter is located, to send a message to the base station controller, and to send information to other baseband processing units.
  • the baseband processing unit may be located in the system embodiment or base station embodiment or base of the present invention. In the base station in the station group embodiment.
  • the baseband processor can communicate with other base stations in addition to communicating with the base station controller, so that the base station where the baseband processor is located can communicate with other base stations, so that different base stations are configured to use the same.
  • the base station group of the BCCH frequency thus saves the BCCH frequency.
  • the term "and/or” is merely an association describing the associated object, indicating that there may be three relationships.
  • a and / or B can mean: A exists separately, there are A and B, and there are three cases of B alone.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the components displayed for the unit may or may not be physical units, ie may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in various embodiments of the present invention may be integrated into one processing unit
  • each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like. The medium of the code.

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

Abstract

Des modes de réalisation de la présente invention concernent un système de réseau et un dispositif de réseau qui sont basés sur un point de fréquence de canal BCCH commun et qui permettent une mise en réseau efficace dans le cas de points de fréquence de canal BCCH inadéquats. Le système comprend : au moins trois groupes de stations de base, un groupe de stations de base étant composé d'au moins deux stations de base, toutes les stations de base dans chaque groupe de stations de base utilisant le même point de fréquence de canal BCCH tandis que des groupes de stations de base voisins utilisent des points de fréquence de canal BCCH différents; et au moins un contrôleur de station de base pour la communication avec les stations de base dans les groupes de stations de base. Les modes de réalisation de la présente invention prennent en charge une plus grande plage de mise en réseau, ce qui permet ainsi d'économiser la largeur de bande de canal BCCH, de réduire les interférences dans les réseaux et d'améliorer la capacité des réseaux, de sorte qu'une mise en réseau puisse être implémentée dans un mode utilisant des fréquences plus proches et que la largeur de bande opérationnelle soit davantage économisée.
PCT/CN2012/088108 2012-12-31 2012-12-31 Système de réseau et dispositif de réseau basés sur un point de fréquence de canal bcch commun WO2014101217A1 (fr)

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PCT/CN2012/088108 WO2014101217A1 (fr) 2012-12-31 2012-12-31 Système de réseau et dispositif de réseau basés sur un point de fréquence de canal bcch commun
CN201280002801.0A CN103250443B (zh) 2012-12-31 2012-12-31 共用bcch频点的组网系统和网络设备

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PCT/CN2012/088108 WO2014101217A1 (fr) 2012-12-31 2012-12-31 Système de réseau et dispositif de réseau basés sur un point de fréquence de canal bcch commun

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CN104080092A (zh) * 2014-07-15 2014-10-01 清华大学 一种基站分组方法及系统

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CN108377545B (zh) * 2018-01-31 2021-09-10 北京聚利科技有限公司 路侧单元无线同步方法、路侧设备及系统

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