WO2016078310A1 - 时钟同步方法、装置、级联基站系统和存储介质 - Google Patents

时钟同步方法、装置、级联基站系统和存储介质 Download PDF

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Publication number
WO2016078310A1
WO2016078310A1 PCT/CN2015/076719 CN2015076719W WO2016078310A1 WO 2016078310 A1 WO2016078310 A1 WO 2016078310A1 CN 2015076719 W CN2015076719 W CN 2015076719W WO 2016078310 A1 WO2016078310 A1 WO 2016078310A1
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clock synchronization
clock
synchronization information
information
base station
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PCT/CN2015/076719
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English (en)
French (fr)
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于鹏伟
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中兴通讯股份有限公司
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Publication of WO2016078310A1 publication Critical patent/WO2016078310A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

Definitions

  • the present invention relates to the field of electronic devices, and in particular, to a clock synchronization method and apparatus, a cascade base station system, and a storage medium.
  • a wireless communication base station especially a wireless device operating in a time division mode, requires a reliable, stable, and synchronized clock to ensure continuity of service of the terminal equipment between different base stations.
  • CDMA2000 Code Division Multiple Access 2000
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • LTE Long Term Evolution
  • the traditional base station cascade timing scheme is to use a satellite-like clock source, for example, each base station tracks a GPS (Global Positioning System) satellite signal to achieve full-network synchronization; the disadvantage is that the GPS antenna and the receiver are connected by a radio frequency cable.
  • the RF cable is too long, the GPS signal is too attenuated, the built-in GPS receiver cannot reliably collect the star, and if the GPS is installed at each site, the cost increases. Therefore, the existing base station clock synchronization scheme is not perfect.
  • the embodiments of the present invention are intended to provide a clock synchronization method, a device, a cascade base station system, and a storage medium, which at least partially solve the problem that the existing base station clock synchronization scheme is imperfect.
  • a first aspect of the embodiments of the present invention provides a clock synchronization method, including: acquiring first clock synchronization information from an external clock source, where the first clock synchronization information includes clock information of the external clock source; The synchronization information adjusts the local clock, and transmits the second clock synchronization information to other base stations in a preset manner, where the second clock synchronization information includes the first time The clock synchronization information is generated or generated based on the first clock synchronization information.
  • the transmitting the second clock synchronization information to the other base stations in a preset manner comprises: filling the second clock synchronization information into a message of the expandable information described in the flow control transmission protocol. Or constructing a new message suitable for flow control transmission protocol transmission according to the second clock synchronization information; based on the flow control transmission protocol, the flow control transmission protocol described in the scalable information message, the new message The message is transmitted to other base stations.
  • the message of the extensible information described in the flow control transport protocol comprises a heartbeat message.
  • the second clock synchronization information further includes one or more of leap second information, clock source type information, and clock source working state information.
  • a second aspect of the embodiments of the present invention provides a clock synchronization method, including: acquiring second clock synchronization information from at least one external base station; determining, as a clock reference, from each acquired second clock synchronization information according to a preset manner. Two clock synchronization information; the local clock is adjusted according to the second clock synchronization information as a clock reference.
  • the clock synchronization method further includes transmitting the acquired second clock synchronization information or the second clock synchronization information as a clock reference to other base stations in a preset manner.
  • the obtaining, by the at least one external base station, the second clock synchronization information comprises: acquiring, according to a flow control transmission protocol, a message from at least one external base station, where the message includes a location populated with the second clock synchronization information Deriving a message describing the extensible information described in the transport control protocol, or a new message constructed according to the second clock synchronization information and adapted to be transmitted by the flow control transport protocol; extracting the second from each of the obtained messages Clock synchronization information;
  • the message of the extensible information described in the flow control transport protocol comprises a heartbeat message.
  • the second clock synchronization information includes: clock source type information.
  • the determining, by using the preset second clock synchronization information, the second clock synchronization information as the clock reference includes: according to the clock source in each acquired second clock synchronization information.
  • a third aspect of the embodiments of the present invention provides a clock synchronization apparatus, including: a first acquiring module, configured to acquire first clock synchronization information from an external clock source, where the first clock synchronization information includes clock information of the clock source; The first adjustment module is configured to adjust the local clock according to the first clock synchronization information acquired by the first acquisition module; and the first transmission processing module is configured to transmit the second clock synchronization information to other base stations in a preset manner, where The second clock synchronization information includes the first clock synchronization information or is generated according to the first clock synchronization information.
  • the second clock synchronization device includes: a second acquiring module configured to acquire second clock synchronization information from the at least one external base station; and a determining module configured to synchronize the second clocks acquired from the second acquiring module according to the preset manner In the information, the second clock synchronization information is determined as a clock reference; and the second adjustment module is configured to adjust the local clock according to the second clock synchronization information as a clock reference.
  • a fourth embodiment of the present invention provides a cascading base station system, including at least two base stations participating in cascading, wherein at least one base station participating in the cascading includes the foregoing clock synchronization device, and other base stations participating in the cascading include the foregoing The latter clock synchronization device.
  • a fifth aspect of the embodiments of the present invention provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to perform at least one of the foregoing methods.
  • the clock synchronization method and device, the cascade base station system, and the storage medium provided by the embodiment of the present invention wherein a base station acquires first clock synchronization information from an external clock source, and adjusts a local clock according to the acquired first clock synchronization information, and presets
  • the method will include the first clock synchronization information or according to
  • the second clock synchronization information generated by the first clock synchronization information is transmitted to other base stations, and the other base station performs local clock adjustment according to the acquired second clock synchronization information, and may further transmit the second clock synchronization information to other base stations.
  • the clock synchronization information is transmitted by means of the link between the base stations, the clock synchronization information is shared between the base stations, and finally the clock synchronization of the plurality of base stations is achieved.
  • the clock synchronization information is transmitted between the base stations based on the SCTP (Stream Control Transmission Protocol). Since the existing base stations often have an SCTP link, the clock synchronization information is transmitted based on the SCTP, and the chain synchronization information may be omitted. Road, does not change the network topology, does not increase network load, reduce the cost of erection.
  • SCTP Stream Control Transmission Protocol
  • FIG. 1 is a flowchart of a clock synchronization method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a clock synchronization method according to another embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a clock synchronization apparatus according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a clock synchronization apparatus according to another embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a cascaded base station system according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a cascaded base station system according to another embodiment of the present invention.
  • the embodiment of the present invention provides a new technical solution, in which one base station (hereinafter collectively referred to as a first type of base station)
  • the external clock source acquires the first clock synchronization information, performs local clock adjustment according to the first clock synchronization information, and transmits the second clock synchronization information to other base stations (other base stations are established with the first type of base station to be capable of transmitting the second clock)
  • Synchronization information a base station of the link, for example, a base station having a relationship or a cascading relationship with the first type of base station, hereinafter referred to as a second type of base station, and a second type of base station adjusting the local clock according to the acquired second clock synchronization information, It is also possible to continue to transmit the second clock synchronization information to other base stations, and so on, to transmit clock synchronization information by means of a link
  • the clock synchronization process of the first type of base station includes the following processes:
  • the clock source includes but is not limited to: a satellite-like clock source (such as a GPS satellite), and an IEEE 1588 clock source. If it is a satellite clock source, the first type of base station can be obtained from the receiver. If it is an IEEE1588 clock source, the first type of base station can be obtained from the Announce message.
  • a satellite-like clock source such as a GPS satellite
  • IEEE 1588 clock source If it is a satellite clock source, the first type of base station can be obtained from the receiver. If it is an IEEE1588 clock source, the first type of base station can be obtained from the Announce message.
  • the first clock synchronization information may include: clock information of the clock source, and the following: the leap second information, the clock source type information, the clock source working state information, the number of seconds in the GPS time week, the number of GPS time weeks, and the alarm information. One or more.
  • the second clock synchronization information may include the first clock synchronization information or may be generated according to the first clock synchronization information.
  • the second clock synchronization information may be clock information of the clock source in the first type of base station synchronization information according to the first type of base station.
  • the clock information calculated by the second information.
  • the second clock synchronization information includes clock information of the clock source acquired by the first type of base station, so that the base station that receives the second clock synchronization information directly adjusts the local clock according to the clock information of the clock source, and is not It is limited to a base station that transmits the second clock synchronization information.
  • the second clock synchronization information may further include one or more of leap second information, clock source type information, and clock source working state information.
  • the other base station is a base station that establishes a communication link capable of transmitting the second clock synchronization information with the first type of base station. Since an existing SCTP link exists between the existing base stations, in order to avoid additional links between the base stations, an optional The second clock synchronization information is transmitted based on the SCTP.
  • the manner of transmitting the second clock synchronization information based on SCTP includes, but is not limited to, the following two types:
  • the second clock synchronization information is filled into the message of the scalable information described in the SCTP, and then the message of the scalable information described in the SCTP is transmitted to other base stations based on the SCTP.
  • the message is transmitted on an existing SCTP link with other base stations.
  • the messages of the extensible information described in the SCTP include, but are not limited to, a HEARTBEAT message.
  • the existing HEARTBEAT message usually has the following four fields: Type, Chunk Flags, HeatbeatLength, and HeartInformation; where the Type field usually occupies 8 bits and is used to fill the characters identifying the HEARTBEAT message; the Chunk Flags field usually takes 8 bits for padding. The flag bit of the data block; the HeatbeatLength field usually takes 16 bits to fill the length of the HEARTBEAT message, and the HeartInformation field is an expandable field.
  • the second clock synchronization information may be filled in the HeartInformation field.
  • the second clock synchronization information is filled in the field in a TLV (Type-Length-Variable) format, as shown in Table 1.
  • the HB Type indicates the clock information of the clock source and the leap second information; if the HB Type is 2, it indicates other information in the second clock synchronization information.
  • a new message suitable for SCTP transmission is constructed according to the second clock synchronization information, the new message carries the second clock synchronization information, and the new message is transmitted to other base stations based on the SCTP. As in The message is transmitted on an existing SCTP link with other base stations.
  • the first type of base station may establish a link with a plurality of other base stations, the first type of base station may transmit the second clock synchronization information to the plurality of other base stations.
  • the clock synchronization process of the second type of base station includes the following processes:
  • the second type of base station may establish a link with a plurality of external base stations, and therefore, it is possible to receive the second clock synchronization information sent by the plurality of external base stations.
  • the external base station may be a first type of base station or a second type of base station.
  • the second clock synchronization information is optionally acquired based on the SCTP.
  • the manner of acquiring the second clock synchronization information based on the SCTP includes but is not limited to the following two types:
  • the message of the scalable information described in the SCTP filled with the second clock synchronization information is obtained from the at least one external base station, such as acquiring the message on the existing SCTP link with the external base station.
  • the second clock synchronization information is extracted from the obtained message.
  • the messages of the extensible information described in the SCTP include, but are not limited to, a HEARTBEAT message.
  • the HEARTBEAT message described in the SCTP may be obtained from at least one external base station, and the second clock synchronization information may be extracted therefrom.
  • the second clock synchronization information includes clock source type information, and the obtained clock source type information in the second clock synchronization information and the preset clock source priority order are obtained from each of the acquired clock synchronization information.
  • the second clock synchronization information having the highest clock source priority is selected as the clock reference in the second clock synchronization information.
  • the clock source priority order is from high to low: satellite clock source, IEEE1588, 1PPS+TOD;
  • the second type of base station further transmits the acquired second clock synchronization information or the second clock synchronization information as a clock reference to other base stations in a preset manner. Since the second type of base station may establish a link with a plurality of other base stations, it may transmit to a plurality of other base stations, so that the second clock synchronization information can be transmitted and shared to more base stations.
  • FIG. 3 is a schematic diagram of a clock synchronization apparatus according to an embodiment of the present invention.
  • the clock synchronization apparatus 3 includes: a first acquisition module 31 configured to acquire first clock synchronization information from an external clock source, where The clock synchronization information includes clock information of the clock source; the first adjustment module 32 is configured to adjust the local clock according to the first clock synchronization information acquired by the first acquisition module 31; and the first transmission processing module 33 is configured to Transmitting the second clock synchronization information to the other base stations in a preset manner, the second clock synchronization information including the first clock synchronization information, or generated according to the first clock synchronization information.
  • the second clock synchronization information includes clock information of the clock source, so that the base station that receives the second clock synchronization information can directly adjust the local clock according to the clock information of the clock source, and is not limited to transmitting the second clock.
  • the second clock synchronization information may further include one or more of leap second information, clock source type information, and clock source working state information.
  • the first transmission processing module 33 includes: a first filler submodule and/or a first configuration submodule, and a first transmission submodule,
  • a first padding submodule configured to fill the second clock synchronization information into a message of the extensible information described in the SCTP;
  • the message of the extensible information described in the SCTP includes but not Limited to: heartbeat messages;
  • a first configuration submodule configured to construct a new message suitable for SCTP transmission according to the second clock synchronization information
  • the first transmission submodule is configured to transmit, according to the SCTP, the message of the extensible information and the new message constructed by the first configuration submodule described in the SCTP after the first padding submodule is filled to other base stations.
  • the clock synchronization apparatus 4 includes: a second acquisition module 41 configured to acquire second clock synchronization information from at least one external base station;
  • the module 42 is configured to determine second clock synchronization information as a clock reference in each second clock synchronization information acquired from the second acquisition module 41 according to a preset manner; and the second adjustment module 43 is configured to be based on the clock reference
  • the second clock synchronization information adjusts the local clock.
  • the second obtaining module comprises:
  • a sub-module configured to acquire a message from at least one external base station based on SCTP, the message comprising a message encapsulating the expandable information described in the SCTP of the second clock synchronization information, or synchronizing according to the second clock New messages constructed for information suitable for SCTP transmission;
  • Extracting the submodule configured to extract the second clock synchronization information from each message acquired by the obtaining submodule;
  • the second clock synchronization information includes: clock source type information.
  • the determining module 42 is specifically configured to select, according to the clock source type information in each second clock synchronization information acquired by the second obtaining module 41, and the preset clock source priority order, from the acquired second clock synchronization information.
  • the second clock synchronization information with the highest priority of the clock source is used as a clock reference.
  • the clock synchronization device 4 further includes:
  • the second transmission processing module 44 is configured to acquire the second acquisition module 41 in a preset manner. Each second clock synchronization information, or the second clock synchronization information determined by the determining module 43 as a clock reference, is transmitted to other base stations.
  • the present invention further provides a cascading base station system, comprising at least two base stations participating in cascading, wherein at least one of the base stations participating in the cascading is a first type of base station, that is, including the above-mentioned clock synchronization device 3, and other base stations participating in cascading are
  • the second type of base station includes the above-described clock synchronization device 4.
  • the first type of base station acquires first clock synchronization information from an external clock source through the clock synchronization device 3, performs local clock adjustment according to the first clock synchronization information, and transmits the second clock synchronization information to the second category with which the link is established.
  • the base station (optionally transmitted to the second type of base station with which the SCTP link is established), the second type of base station receiving the second clock synchronization information performs local clock adjustment according to the second clock synchronization information, and can continue to
  • the second clock synchronization information is transmitted to other base stations that establish a link with itself, and so on, the clock synchronization information is transmitted by using the link between the base stations, and the clock synchronization information is shared between the base stations, and finally the clocks of the multiple base stations are reached. Synchronize.
  • the cascading base station system includes three base stations, which are respectively cascaded base stations A, B, and C (the straight line in the figure indicates a cascading relationship), where the base station A and the base station B An X2 SCTP link is established between the base station A and the base station C (the dotted line indicates the SCTP link).
  • the base station A serves as the first type of base station
  • the base stations B and C serve as the second type of base station.
  • the base station A obtains the first clock synchronization information from the external clock source, and the first clock synchronization information includes the clock information of the clock source, the leap second information, the clock source type information, and the clock source working state information, and the base station A adjusts according to the first clock synchronization information.
  • a local clock, and the first clock synchronization information (this embodiment assumes that the first clock synchronization information is directly used as the second clock synchronization information) is filled into the HEARBEAT message in the SCTP, and the base station A is based on the base station B and the base station C.
  • the inter-SCTP link transmits the HEARBEAT message filled with the first clock synchronization information to the base stations B and C. After receiving the base station B and C, the first clock synchronization information in the HEARBEAT message is extracted, and the local clock adjustment is completed.
  • the cascading base station system includes three base stations, which are base stations A, B, and C that are sequentially cascaded (the straight line in the figure indicates a cascading relationship), where the base station A and the base An X2 SCTP link is established between the station C and the base station B and the base station C (the dotted line indicates the SCTP link).
  • the base stations A and B are used as the first type of base station, and the base station C is used as the second type.
  • the base station, the base stations A and B respectively obtain the first clock synchronization information from different external clock sources, and the first clock synchronization information acquired by the base station includes clock information of the clock source, leap second information, clock source type information, and clock source working state information, and the base station A and B respectively adjust the local clock according to the acquired first clock synchronization information, and fill the first clock synchronization information (which assumes that the first clock synchronization information is directly used as the second clock synchronization information) into the SCTP.
  • the HEARBEAT message is transmitted to the base station C based on the SCTP link between the base station C and the base station C, respectively.
  • the base station C receives the HEARBEAT message from the base station A and the HEARBEAT message from the base station B, respectively, and extracts the first clock synchronization information therein.
  • the base station A in this embodiment is the first clock synchronization information acquired from the satellite-like clock source, and the base station B is from 1 pps+tod.
  • the first clock synchronization information acquired by the clock source then the base station C selects the base station A transmission according to the clock source type information in the first clock synchronization information and the preset clock source priority order: the satellite clock source is higher than 1 pps+tod.
  • the first clock synchronization information comes as a clock reference, and the local clock is adjusted according to the first clock synchronization information transmitted by the base station A.
  • the clock synchronization information is transmitted by using the link between the base stations, the clock synchronization information is shared between the base stations, and finally the clock synchronization of the multiple base stations is achieved, and the GPS is not required to be installed at each station, which is cost-effective, and is particularly applicable.
  • the clock synchronization information is transmitted based on the SCTP, and the link may not be set, the network topology is not changed, the network load is not increased, and the installation cost is reduced.
  • the second clock synchronization information is filled into the HEARBEAT message in the SCTP for transmission, and it is more convenient to reconstruct the message.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute at least one of the methods described in the foregoing embodiments, such as The method shown in Figures 1 and/or 2 is shown.
  • the computer storage medium described in this embodiment may be a dynamic storage device or a read only memory (ROM, Read-Only Memory), random access memory (RAM), magnetic disk or optical disk, and the like, which can store a program code.
  • the computer storage medium can be a non-transitory storage medium; The program code is stored stably.

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Abstract

本发明公开一种时钟同步方法、装置、级联基站系统和计算机存储介质，第一类基站从外部时钟源获取第一时钟同步信息；根据第一时钟同步信息调整本地时钟，并以预设方式将第二时钟同步信息传输给其他基站，第二时钟同步信息包括所述第一时钟同步信息或者根据第一时钟同步信息生成。第二类基站从至少一个外部基站获取第二时钟同步信息；根据预设方式从各第二时钟同步信息中确定作为时钟基准的第二时钟同步信息；根据作为时钟基准的第二时钟同步信息调整本地时钟。本发明通过以上技术方案，借助基站间的链路来传输时钟同步信息，实现时钟同步信息在基站间的共享，最终达到多个基站的时钟同步，相比现有技术而言，无需在每个站点都架设GPS，节约成本。

Description

时钟同步方法、装置、级联基站系统和存储介质 技术领域
本发明涉及电子设备领域，尤其涉及一种时钟同步方法、装置、级联基站系统和存储介质。
背景技术
无线通信基站，尤其是以时分模式运营的无线设备，需要可靠、稳定、同步时钟以保证终端设备在不同基站之间切换业务的连续性。比如CDMA2000(Code Division Multiple Access 2000)、TD-SCDMA(Time Division-Synchronous Code Division Multiple Access)以及LTE(Long Term Evolution)都需要相位同步或帧号同步。传统的基站级联授时方案是，借助卫星类时钟源，例如每个基站都跟踪GPS(Global Positioning System)卫星信号，实现全网同步；缺点是由于GPS天线和接收机之间通过射频线缆连接，有些应用场景射频线缆过长，GPS信号衰减太大，内置GPS接收机无法可靠收星，另外如果每个站点都架设GPS，成本随之增大。因此，现有基站时钟同步方案并不完善。
发明内容
本发明实施例期望提供一种时钟同步方法、装置、级联基站系统和存储介质，至少部分解决现有基站时钟同步方案不完善的问题。
本发明实施例采用以下技术方案:
本发明实施例第一方面提供一种时钟同步方法，包括：从外部时钟源获取第一时钟同步信息，所述第一时钟同步信息包括所述外部时钟源的时钟信息；根据获取的第一时钟同步信息调整本地时钟，并以预设方式将第二时钟同步信息传输给其他基站，所述第二时钟同步信息包括所述第一时 钟同步信息，或者根据所述第一时钟同步信息生成。
在一些实施例中，所述以预设方式将所述第二时钟同步信息传输给其他基站包括：将所述第二时钟同步信息填充进流控制传输协议中所描述的可扩展信息的消息中；或者根据所述第二时钟同步信息构造适于流控制传输协议传输的新消息；基于所述流控制传输协议，将所述流控制传输协议中所描述的可扩展信息的消息、所述新消息传输给其他基站。
在一些实施例中，所述流控制传输协议中所描述的可扩展信息的消息包括：心跳消息。
在一些实施例中，所述第二时钟同步信息还包括：闰秒信息、时钟源类型信息、时钟源工作状态信息中的一种或多种。
本发明实施例第二方面提供一种时钟同步方法，包括：从至少一个外部基站获取第二时钟同步信息；根据预设方式从获取到的各第二时钟同步信息中，确定作为时钟基准的第二时钟同步信息；根据作为时钟基准的第二时钟同步信息调整本地时钟。
在一些实施例中，该时钟同步方法还包括：以预设方式将获取到的各第二时钟同步信息，或所述作为时钟基准的第二时钟同步信息传输给其他基站。
在一些实施例中，所述从至少一个外部基站获取第二时钟同步信息包括：基于流控制传输协议，从至少一个外部基站获取消息，所述消息包括填充有所述第二时钟同步信息的所述流控制传输协议中所描述的可扩展信息的消息，或根据所述第二时钟同步信息构造的适于流控制传输协议传输的新消息；从获取到的各消息中提取出所述第二时钟同步信息；
在一些实施例中，所述流控制传输协议中所描述的可扩展信息的消息包括：心跳消息。
在一些实施例中，所述第二时钟同步信息包括：时钟源类型信息。
在一些实施例中，所述根据预设方式从获取到的各第二时钟同步信息中，确定作为时钟基准的第二时钟同步信息包括：根据获取到的各第二时钟同步信息中的时钟源类型信息，以及预设的时钟源优先级顺序，从获取到的各第二时钟同步信息中选择出时钟源优先级最高的第二时钟同步信息作为时钟基准。
本发明实施例第三方面提供一种时钟同步装置，包括：第一获取模块，配置为从外部时钟源获取第一时钟同步信息，所述第一时钟同步信息包括所述时钟源的时钟信息；第一调整模块，配置为根据第一获取模块获取的所述第一时钟同步信息调整本地时钟；以及第一传输处理模块，配置为以预设方式将第二时钟同步信息传输给其他基站，所述第二时钟同步信息包括所述第一时钟同步信息，或者根据所述的第一时钟同步信息生成。
另一种时钟同步装置，包括：第二获取模块，配置为从至少一个外部基站获取第二时钟同步信息；确定模块，配置为根据预设方式从第二获取模块获取到的各第二时钟同步信息中，确定作为时钟基准的第二时钟同步信息；第二调整模块，配置为根据作为时钟基准的第二时钟同步信息调整本地时钟。
本发明实施例第四方面提供一种级联基站系统，包括至少两个参与级联的基站，其中至少一个参与级联的基站包括上述前一种时钟同步装置，其他参与级联的基站包括上述后一种时钟同步装置。
本发明实施例第五方面提供一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行上述方法的至少其中之一。
本发明实施例提供的时钟同步方法、装置、级联基站系统和存储介质，其中一个基站从外部时钟源获取第一时钟同步信息，根据获取的第一时钟同步信息调整本地时钟，并以预设方式将包括该第一时钟同步信息或根据 该第一时钟同步信息生成的第二时钟同步信息传输给其他基站，该其他基站根据获取到的第二时钟同步信息进行本地时钟的调整，还可以继续将第二时钟同步信息传出给其他基站，如此类推，借助基站间的链路来传输时钟同步信息，实现时钟同步信息在基站间的共享，最终达到多个基站的时钟同步，相比现有技术而言，无需在每个站点都架设GPS，节约成本。对于级联基站系统而言，只要其中一个参与级联的基站从外部时钟源获取第一时钟同步信息后，便可实现全系统基站的时钟同步。可选地，基站间基于SCTP(Stream Control Transmission Protocol，流控制传输协议)来传输时钟同步信息，由于现有基站间往往存在SCTP链路，因此基于SCTP来传输时钟同步信息，可以不另设链路、不改变网络拓扑、不增加网络负荷、降低架设成本。
附图说明
图1为本发明一实施例提供的时钟同步方法的流程图；
图2为本发明另一实施例提供的时钟同步方法的流程图；
图3为本发明一实施例提供的时钟同步装置的示意图；
图4为本发明另一实施例提供的时钟同步装置的示意图；
图5为本发明一实施例提供的级联基站系统的示意图；
图6为本发明另一实施例提供的级联基站系统的示意图。
具体实施方式
为了完善现有基站的时钟同步方案，避免在每个站点假设GPS，节约成本，简化网络拓扑，本发明实施例提供一种新的技术方案，其中一个基站(以下统称为第一类基站)从外部时钟源获取第一时钟同步信息，根据该第一时钟同步信息进行本地时钟调整，并将第二时钟同步信息传输给其他基站(其他基站是与第一类基站建立有能够传输该第二时钟同步信息的通 信链路的基站，例如与第一类基站具有关联关系或级联关系的基站，以下统称为第二类基站)，第二类基站根据获取到的第二时钟同步信息进行本地时钟的调整，还可以继续将第二时钟同步信息传出给其他基站，如此类推，借助基站间的链路来传输时钟同步信息，实现时钟同步信息在基站间的共享，最终达到多个基站的时钟同步。
作为一种实施例，第一类基站的时钟同步过程，如图1所示，包括如下流程：
S101、从外部时钟源获取第一时钟同步信息，所述第一时钟同步信息包括所述时钟源的时钟信息。
其中，时钟源包括但不局限于：卫星类时钟源(例如GPS卫星)、IEEE1588时钟源。如果是卫星类时钟源，第一类基站可以从接收机获取，如果是IEEE1588时钟源，第一类基站可以从通知(Announce)报文中获取。
第一时钟同步信息除了包括时钟源的时钟信息之外，还可以包括：闰秒信息、时钟源类型信息、时钟源工作状态信息、GPS时间周内秒数、GPS时间周数、告警信息中的一种或多种。
S102、根据获取的第一时钟同步信息调整本地时钟，并以预设方式将第二时钟同步信息传输给其他基站。
第二时钟同步信息可以包括第一时钟同步信息，或者根据第一时钟同步信息生成，例如，第二时钟同步信息可以是第一类基站根据第一时钟同步信息中的时钟源的时钟信息和闰秒信息计算出的时钟信息。可选地，第二时钟同步信息包括第一类基站获取到的时钟源的时钟信息，这样能够让接收到第二时钟同步信息的基站直接根据时钟源的时钟信息来调整本地时钟，而不受限于传输该第二时钟同步信息的基站。第二时钟同步信息还可以包括：闰秒信息、时钟源类型信息、时钟源工作状态信息中的一种或多种。
其他基站是与第一类基站建立有能够传输该第二时钟同步信息的通信链路的基站，由于现有基站间往往存在SCTP链路，因此，为了避免在基站间额外增设链路，可选地，基于SCTP来传输第二时钟同步信息。
基于SCTP来传输第二时钟同步信息的方式，包括但不局限于以下所列举的两种：
其一，将所述第二时钟同步信息填充进SCTP中所描述的可扩展信息的消息中，再基于SCTP，将该SCTP中所描述的可扩展信息的消息传输给其他基站。如在与其他基站间现有的SCTP链路上传输该消息。
SCTP中所描述的可扩展信息的消息包括但不局限于：心跳(HEARTBEAT)消息。
现有的HEARTBEAT消息通常有以下四个字段：Type、Chunk Flags、HeatbeatLength、HeartInformation；其中，Type字段通常占8位，用于填充标识HEARTBEAT消息的字符；Chunk Flags字段通常占8位，用于填充数据块的标志位；HeatbeatLength字段通常占16位，用于填充HEARTBEAT消息的长度，HeartInformation字段为可扩展字段。
本实施例可以在HeartInformation字段中填充第二时钟同步信息，可选地，以TLV(Type-Length-Variable)格式在该字段填充第二时钟同步信息，如表一所示。
表一
Figure PCTCN2015076719-appb-000001
例如，HB Type为1，则表示时钟源的时钟信息和闰秒信息；HB Type为2，则表示第二时钟同步信息中的其他信息。
其二，根据第二时钟同步信息构造适于SCTP传输的新消息，新消息中携带第二时钟同步信息，再基于SCTP，将该新消息传输给其他基站。如在 与其他基站间现有的SCTP链路上传输该消息。
由于，该第一类基站有可能与多个其他基站建立了链路，因此，该第一类基站可向多个其他基站传输第二时钟同步信息。
作为一种实施例，第二类基站的时钟同步过程，如图2所示，包括如下流程：
S201、从至少一个外部基站获取第二时钟同步信息。
第二类基站有可能与多个外部基站建立了链路，因此，有可能收到多个外部基站发送的第二时钟同步信息。该外部基站可以是第一类基站，也可以同是第二类基站。
由于现有基站间往往存在SCTP链路，因此，为了避免在基站间额外增设链路，可选地，基于SCTP来获取第二时钟同步信息。
基于SCTP来获取第二时钟同步信息的方式，包括但不局限于以下所列举的两种：
其一，基于SCTP，从至少一个外部基站获取填充有该第二时钟同步信息的SCTP中所描述的可扩展信息的消息，如在与外部基站间现有的SCTP链路上获取该消息，从获取到的该消息中提取出第二时钟同步信息。
SCTP中所描述的可扩展信息的消息包括但不局限于：心跳(HEARTBEAT)消息。可以从至少一个外部基站获取SCTP中所描述的HEARTBEAT消息，再从中提取出第二时钟同步信息。
其二，基于SCTP，从至少一个外部基站获取外部基站根据该第二时钟同步信息构造的适于流控制传输协议传输的新消息，该新消息中携带该第二时钟同步信息，如在与外部基站间现有的SCTP链路上获取该新消息，从获取到的该新消息中提取出第二时钟同步信息。
S202、根据预设方式从获取到的各第二时钟同步信息中，确定作为时钟基准的第二时钟同步信息。
作为一种实施例，第二时钟同步信息中包括时钟源类型信息，根据获取到的各第二时钟同步信息中的时钟源类型信息，以及预设的时钟源优先级顺序，从获取到的各第二时钟同步信息中选择出时钟源优先级最高的第二时钟同步信息作为时钟基准。可选地，时钟源优先级顺序由高到底为：卫星类时钟源、IEEE1588、1PPS+TOD；
S203、根据作为时钟基准的第二时钟同步信息调整本地时钟。
在一些实施例中，第二类基站还以预设方式将获取到的各第二时钟同步信息，或作为时钟基准的第二时钟同步信息传输给其他基站。由于该第二类基站可能与多个其他基站建立链路，因此可向多个其他基站传输，这样便能将第二时钟同步信息传下去，共享给更多的基站。
图3为本发明一实施例提供的时钟同步装置的示意图，如图3所示，时钟同步装置3包括：第一获取模块31，配置为从外部时钟源获取第一时钟同步信息，所述第一时钟同步信息包括所述时钟源的时钟信息；第一调整模块32，配置为根据第一获取模块31获取的所述第一时钟同步信息调整本地时钟；以及第一传输处理模块33，配置为以预设方式将第二时钟同步信息传输给其他基站，所述第二时钟同步信息包括所述第一时钟同步信息，或者根据所述的第一时钟同步信息生成。可选地，第二时钟同步信息包括时钟源的时钟信息，这样能够让接收到第二时钟同步信息的基站直接根据时钟源的时钟信息来调整本地时钟，而不受限于传输该第二时钟同步信息的基站。第二时钟同步信息还可以包括：闰秒信息、时钟源类型信息、时钟源工作状态信息中的一种或多种。
在一些实施例中，第一传输处理模块33包括：第一填充子模块和/或第一构造子模块，以及第一传输子模块，
第一填充子模块，配置为将所述第二时钟同步信息填充进SCTP中所描述的可扩展信息的消息中；SCTP中所描述的可扩展信息的消息包括但不局 限于：心跳消息；
第一构造子模块，配置为根据所述第二时钟同步信息构造适于SCTP传输的新消息；
第一传输子模块，配置为基于SCTP，将第一填充子模块填充后的该SCTP中所描述的可扩展信息的消息、第一构造子模块构造的所述新消息传输给其他基站。
图4为本发明另一实施例提供的时钟同步装置的示意图，如图4所示，时钟同步装置4包括：第二获取模块41，配置为从至少一个外部基站获取第二时钟同步信息；确定模块42，配置为根据预设方式从第二获取模块41获取到的各第二时钟同步信息中，确定作为时钟基准的第二时钟同步信息；第二调整模块43，配置为根据作为时钟基准的第二时钟同步信息调整本地时钟。
在一些实施例中，第二获取模块包括：
获取子模块，配置为基于SCTP，从至少一个外部基站获取消息，所述消息包括填充有所述第二时钟同步信息的SCTP中所描述的可扩展信息的消息，或根据所述第二时钟同步信息构造的适于SCTP传输的新消息；
提取子模块，配置为从获取子模块获取到的各消息中提取出所述第二时钟同步信息；
在一些实施例中，所述第二时钟同步信息包括：时钟源类型信息。确定模块42具体用于根据第二获取模块41获取到的各第二时钟同步信息中的时钟源类型信息，以及预设的时钟源优先级顺序，从获取到的各第二时钟同步信息中选择出时钟源优先级最高的第二时钟同步信息作为时钟基准。
在一些实施例中，该时钟同步装置4还包括：
第二传输处理模块44，配置为以预设方式将第二获取模块41获取到的 各第二时钟同步信息，或确定模块43确定的所述作为时钟基准的第二时钟同步信息传输给其他基站。
本发明还提供一种级联基站系统，包括至少两个参与级联的基站，其中至少一个参与级联的基站为第一类基站，即包括上述时钟同步装置3，其他参与级联的基站为第二类基站，即包括上述时钟同步装置4。第一类基站通过上述时钟同步装置3从外部时钟源获取第一时钟同步信息，根据该第一时钟同步信息进行本地时钟调整，并将第二时钟同步信息传输给与其建立链路的第二类基站(可选地，传输给与其建立有SCTP链路的第二类基站)，收到第二时钟同步信息的各第二类基站根据第二时钟同步信息进行本地时钟的调整，还可以继续将该第二时钟同步信息传出给与自身建立链路的其他基站，如此类推，借助基站间的链路来传输时钟同步信息，实现时钟同步信息在基站间的共享，最终达到多个基站的时钟同步。
作为一种实施例，如图5所示，级联基站系统包括三个基站，分别是依次级联的基站A、B、C(图中直线表示级联关系)，其中，基站A与基站B之间、基站A与基站C之间建立有X2的SCTP链路(图中虚线表示SCTP链路)，本实施例中，基站A作为第一类基站，基站B、C作为第二类基站，基站A从外部时钟源获取第一时钟同步信息，第一时钟同步信息包括时钟源的时钟信息、闰秒信息、时钟源类型信息和时钟源工作状态信息，基站A根据该第一时钟同步信息调整本地时钟，并将该第一时钟同步信息(本实施例假设第一时钟同步信息直接作为第二时钟同步信息)填充进SCTP中的HEARBEAT消息，基站A基于与基站B之间、与基站C之间的SCTP链路，将填充有第一时钟同步信息的HEARBEAT消息传输给基站B、C，基站B、C收到后，提取HEARBEAT消息中的第一时钟同步信息，完成本地时钟调整。
作为另一种实施例，如图6所示，级联基站系统包括三个基站，分别是依次级联的基站A、B、C(图中直线表示级联关系)，其中，基站A与基 站C之间、基站B与基站C之间建立有X2的SCTP链路(图中虚线表示SCTP链路)，本实施例中，基站A、B作为第一类基站，基站C作为第二类基站，基站A、B分别从不同外部时钟源获取第一时钟同步信息，各自获取的第一时钟同步信息包括时钟源的时钟信息、闰秒信息、时钟源类型信息和时钟源工作状态信息，基站A、B各自根据获取的第一时钟同步信息调整本地时钟，并将各自获取到的第一时钟同步信息(本实施例假设第一时钟同步信息直接作为第二时钟同步信息)填充进SCTP中的HEARBEAT消息，分别基于与基站C之间的SCTP链路传输给基站C，基站C分别接收到来自基站A的HEARBEAT消息和来自基站B的HEARBEAT消息，分别提取出其中的第一时钟同步信息，此时基站C需要从中确定一个作为时钟基准，假设本实施例中基站A是从卫星类时钟源获取的第一时钟同步信息、基站B是从1pps+tod时钟源获取的第一时钟同步信息，那么基站C根据第一时钟同步信息中的时钟源类型信息，以及预设的时钟源优先级顺序：卫星类时钟源高于1pps+tod，选择基站A传输来的第一时钟同步信息作为时钟基准，根据基站A传输来的第一时钟同步信息调整本地时钟。
本发明实施例中借助基站间的链路来传输时钟同步信息，实现时钟同步信息在基站间的共享，最终达到多个基站的时钟同步，无需在每个站点都架设GPS，节约成本，尤其适用于级联基站系统。由于现有基站间往往存在SCTP链路，因此基于SCTP来传输时钟同步信息，还可以不另设链路、不改变网络拓扑、不增加网络负荷、降低架设成本。将第二时钟同步信息填充进SCTP中的HEARBEAT消息来传输，还无需重构消息，更加方便。
本发明实施例还提供了一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权上述实施例中所述方法的至少其中之一，如图1和/或图2所示的方法。
本实施例所述的计算机存储介质可为动存储设备、只读存储器(ROM， Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质，在本实施例中所述计算机存储介质可为非瞬间存储介质；方便稳定存储所述程序代码。
以上内容是结合具体的实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。凡按照本发明原理所作的修改，都应当理解为落入本发明的保护范围。

Claims (19)

  1. 一种时钟同步方法，包括：
    从外部时钟源获取第一时钟同步信息，所述第一时钟同步信息包括所述外部时钟源的时钟信息；
    根据获取的第一时钟同步信息调整本地时钟，并以预设方式将第二时钟同步信息传输给其他基站，所述第二时钟同步信息包括所述第一时钟同步信息，或者根据所述第一时钟同步信息生成。
  2. 如权利要求1所述的时钟同步方法，其中，所述以预设方式将所述第二时钟同步信息传输给其他基站包括：
    将所述第二时钟同步信息填充进流控制传输协议中所描述的可扩展信息的消息中；或者根据所述第二时钟同步信息构造适于流控制传输协议传输的新消息；
    基于所述流控制传输协议，将所述流控制传输协议中所描述的可扩展信息的消息、所述新消息传输给其他基站。
  3. 如权利要求2所述的时钟同步方法，其中，所述流控制传输协议中所描述的可扩展信息的消息包括：心跳消息。
  4. 如权利要求1至3任一项所述的时钟同步方法，其中，所述第二时钟同步信息还包括：闰秒信息、时钟源类型信息、时钟源工作状态信息中的一种或多种。
  5. 一种时钟同步方法，包括：
    从至少一个外部基站获取第二时钟同步信息；
    根据预设方式从获取到的各第二时钟同步信息中，确定作为时钟基准的第二时钟同步信息；
    根据作为时钟基准的第二时钟同步信息调整本地时钟。
  6. 如权利要求5所述的时钟同步方法，其中，还包括：
    以预设方式将获取到的各第二时钟同步信息，或所述作为时钟基准的第二时钟同步信息传输给其他基站。
  7. 如权利要求5所述的时钟同步方法，其中，所述从至少一个外部基站获取第二时钟同步信息包括：
    基于流控制传输协议，从至少一个外部基站获取消息，所述消息包括填充有所述第二时钟同步信息的所述流控制传输协议中所描述的可扩展信息的消息，或根据所述第二时钟同步信息构造的适于流控制传输协议传输的新消息；
    从获取到的各消息中提取出所述第二时钟同步信息。
  8. 如权利要求7所述的时钟同步方法，其中，所述流控制传输协议中所描述的可扩展信息的消息包括：心跳消息。
  9. 如权利要求5至8任一项所述的时钟同步方法，其中，所述第二时钟同步信息包括：时钟源类型信息。
  10. 如权利要求9所述的时钟同步方法，其中，所述根据预设方式从获取到的各第二时钟同步信息中，确定作为时钟基准的第二时钟同步信息包括：
    根据获取到的各第二时钟同步信息中的时钟源类型信息，以及预设的时钟源优先级顺序，从获取到的各第二时钟同步信息中选择出时钟源优先级最高的第二时钟同步信息作为时钟基准。
  11. 一种时钟同步装置，包括：
    第一获取模块，配置为从外部时钟源获取第一时钟同步信息，所述第一时钟同步信息包括所述时钟源的时钟信息；
    第一调整模块，配置为根据第一获取模块获取的所述第一时钟同步信息调整本地时钟；
    第一传输处理模块，配置为以预设方式将第二时钟同步信息传输给其 他基站，所述第二时钟同步信息包括所述第一时钟同步信息，或者根据所述的第一时钟同步信息生成。
  12. 如权利要求11所述的时钟同步装置，其中，第一传输处理模块包括：
    第一填充子模块和/或第一构造子模块，以及第一传输子模块，
    第一填充子模块，配置为将所述第二时钟同步信息填充进流控制传输协议中所描述的可扩展信息的消息中；
    第一构造子模块，配置为根据所述第二时钟同步信息构造适于流控制传输协议传输的新消息；
    第一传输子模块，配置为基于所述流控制传输协议，将第一填充子模块填充后的所述流控制传输协议中所描述的可扩展信息的消息、第一构造子模块构造的所述新消息传输给其他基站。
  13. 一种时钟同步装置，包括：
    第二获取模块，配置为从至少一个外部基站获取第二时钟同步信息；
    确定模块，配置为根据预设方式从第二获取模块获取到的各第二时钟同步信息中，确定作为时钟基准的第二时钟同步信息；
    第二调整模块，配置为根据作为时钟基准的第二时钟同步信息调整本地时钟。
  14. 如权利要求13所述的时钟同步装置，其中，还包括：
    第二传输处理模块，配置为以预设方式将第二获取模块获取到的各第二时钟同步信息，或确定模块确定的所述作为时钟基准的第二时钟同步信息传输给其他基站。
  15. 如权利要求13所述的时钟同步装置，其中，第二获取模块包括：
    获取子模块，配置为基于流控制传输协议，从至少一个外部基站获取消息，所述消息包括填充有所述第二时钟同步信息的所述流控制传输协议 中所描述的可扩展信息的消息，或根据所述第二时钟同步信息构造的适于流控制传输协议传输的新消息；
    提取子模块，配置为从获取子模块获取到的各消息中提取出所述第二时钟同步信息。
  16. 如权利要求13至15任一项所述的时钟同步装置，其中，所述第二时钟同步信息包括：时钟源类型信息。
  17. 如权利要求16所述的时钟同步装置，其中，
    确定模块，配置为根据第二获取模块获取到的各第二时钟同步信息中的时钟源类型信息，以及预设的时钟源优先级顺序，从获取到的各第二时钟同步信息中选择出时钟源优先级最高的第二时钟同步信息作为时钟基准。
  18. 一种级联基站系统，包括至少两个参与级联的基站，其中至少一个参与级联的基站包括如权利要求11或12所述的时钟同步装置，其他参与级联的基站包括如权利要求13至17任一项所述的时钟同步装置。
  19. 一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1至10所述方法的至少其中之一。
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