WO2016090910A1 - 时钟同步方法、装置、基站及通信系统 - Google Patents

时钟同步方法、装置、基站及通信系统 Download PDF

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WO2016090910A1
WO2016090910A1 PCT/CN2015/083587 CN2015083587W WO2016090910A1 WO 2016090910 A1 WO2016090910 A1 WO 2016090910A1 CN 2015083587 W CN2015083587 W CN 2015083587W WO 2016090910 A1 WO2016090910 A1 WO 2016090910A1
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base station
clock synchronization
information
clock
neighboring
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PCT/CN2015/083587
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English (en)
French (fr)
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夏鹏
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中兴通讯股份有限公司
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Publication of WO2016090910A1 publication Critical patent/WO2016090910A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements

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  • This document relates to the field of synchronization of base station clocks in communication systems, and in particular, to a clock synchronization method, device, base station and communication system.
  • the use of air interface synchronization technology for clock synchronization between base stations has become popular. Compared with GPS and 1588 clock schemes, the base station hardware requirements are low, but it is more sensitive to the wireless network environment.
  • the air interface synchronization scheme of the related technology is that the base station directly selects the neighbor base station as the base station. If the synchronization target is used for clock synchronization, the synchronization target is not properly selected. For example, when the two base stations are synchronized with each other, an interlock problem occurs. As a result, the clock of the base station is abnormal, which may cause the air interface synchronization to be abnormal, so that the clock in the network cannot be strictly synchronized. Cause mutual interference.
  • the embodiment of the invention provides a clock synchronization method, device, base station and communication system, which can select a synchronization target according to clock communication information of a neighboring base station.
  • the embodiment of the present invention provides a clock synchronization method, which includes: acquiring clock synchronization information of a neighboring base station, the clock synchronization information includes a clock synchronization object and a clock synchronization level; and determining a target base station according to clock synchronization information of the neighboring base station; The target base station performs clock synchronization.
  • the foregoing embodiment further includes: updating a clock synchronization object in the clock synchronization information of the local base station as a target base station, where the clock synchronization level is a clock synchronization level +1 of the target base station.
  • the foregoing embodiment further includes: if the clock synchronization information of the neighboring base station is not obtained, or the target base station is not determined according to the clock synchronization information of the neighboring base station, setting the clock synchronization information of the local base station to be invalid.
  • the step of acquiring the clock synchronization information of the neighboring base station in the foregoing embodiment includes: monitoring the broadcast information of the neighboring area, determining the global identifier of the neighboring area according to the broadcast information, and determining the neighboring area according to the global identifier and the neighboring area.
  • the area base station communicates to acquire clock synchronization information of the neighboring base station.
  • the foregoing embodiment further includes: determining whether the local base station is in a synchronization state, and if not, determining the target base station according to the clock synchronization information of the neighboring base station.
  • the step of determining the target base station according to the clock synchronization information of the neighboring base station in the foregoing embodiment includes: determining, according to the clock synchronization information of the neighboring base station, that the clock synchronization object is not the base station to be selected, and from all the to-be-selected base stations. The base station with the lowest clock synchronization level is selected as the target base station.
  • the foregoing embodiment further includes: if the base station is in a synchronization state, determining, according to the clock synchronization information of the neighboring base station, whether the current synchronization object is interlocked with the local base station, and if yes, reselecting according to the clock synchronization information of the neighboring base station.
  • Target base station if the base station is in a synchronization state, determining, according to the clock synchronization information of the neighboring base station, whether the current synchronization object is interlocked with the local base station, and if yes, reselecting according to the clock synchronization information of the neighboring base station.
  • the step of determining whether the current synchronization object is interlocked with the local base station according to the clock synchronization information of the neighboring base station in the foregoing embodiment includes: determining whether the clock synchronization object in the clock synchronization information of the current synchronization object is the base station, and if so, Then, it is determined that the current synchronization object is interlocked with the local base station; or, whether the clock synchronization level in the clock synchronization information of the current synchronization object is greater than a threshold, and if yes, determining that the current synchronization object is interlocked with the local base station.
  • the embodiment of the present invention further provides a clock synchronization apparatus.
  • the method includes: an acquisition module, configured to acquire clock synchronization information of a neighboring base station, where the clock synchronization information includes a clock synchronization object and a clock synchronization level; And being configured to determine a target base station according to clock synchronization information of the neighboring base station; and a synchronization module configured to perform clock synchronization with the target base station.
  • the synchronization module in the foregoing embodiment is further configured to: after clock synchronization with the target base station, update a clock synchronization object in the clock synchronization information of the local base station as a target base station, where the clock synchronization level is a clock synchronization level of the target base station+ 1.
  • the synchronization module in the foregoing embodiment is further configured to: when the acquiring module does not obtain the clock synchronization information of the neighboring base station, or the determining module does not determine the target base station according to the clock synchronization information of the neighboring base station, Then, the clock synchronization information of the base station is set to be invalid.
  • the acquiring module in the foregoing embodiment is configured to monitor broadcast information of the neighboring cell, determine a global identifier of the neighboring cell according to the broadcast information, and obtain a neighboring cell base by communicating with the neighboring base station according to the global identifier.
  • Station clock synchronization information is configured to monitor broadcast information of the neighboring cell, determine a global identifier of the neighboring cell according to the broadcast information, and obtain a neighboring cell base by communicating with the neighboring base station according to the global identifier.
  • Station clock synchronization information is configured to monitor broadcast information of the neighboring cell, determine a global identifier of the neighboring cell according to the broadcast information, and obtain a neighboring cell base by communicating with the neighboring base station according to the global identifier.
  • the determining module in the foregoing embodiment is further configured to determine whether the base station is in a synchronization state, and if not, determine the target base station according to the clock synchronization information of the neighboring base station.
  • the determining module in the foregoing embodiment is configured to determine, according to the clock synchronization information of the neighboring base station, that the clock synchronization object is not the base station to be selected, and select, from all the to-be-selected base stations, the base station with the lowest clock synchronization level as the target base station. .
  • the determining module in the foregoing embodiment is further configured to: if the base station is in a synchronization state, determine, according to clock synchronization information of the neighboring base station, whether the current synchronization object is interlocked with the base station, and if yes, according to the clock of the neighboring base station The synchronization information reselects the target base station.
  • the determining module in the foregoing embodiment determines, according to the clock synchronization information of the neighboring base station, whether the current synchronization object is interlocked with the local base station, and includes: determining whether the clock synchronization object in the clock synchronization information of the current synchronization object is the base station. If yes, determine whether the current synchronization object is interlocked with the local base station; or, determine whether the clock synchronization level in the clock synchronization information of the current synchronization object is greater than a threshold, and if yes, determine that the current synchronization object is interlocked with the local base station.
  • the embodiment of the invention further provides a base station, which comprises the above clock synchronization device.
  • Embodiments of the present invention also provide a communication system including the foregoing base station.
  • the embodiment of the invention further provides a computer readable storage medium storing program instructions, which can be implemented when the program instructions are executed.
  • the solution provided by the embodiment of the present invention reduces the clock abnormality of the base station by controlling the selected synchronization target.
  • the clock synchronization information of the neighboring base station is acquired, and the synchronization target is selected according to the clock synchronization information, instead of If the related technology blindly directly uses the neighboring base station as the synchronization target of the clock synchronization, the occurrence of the interlock phenomenon is avoided; optionally, it is also determined whether the base station is interlocked according to the clock synchronization information of the neighboring base station, and is occurring. When interlocking, reselect the sync target.
  • FIG. 1 is a flowchart of a clock synchronization method according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of a clock synchronization apparatus according to a second embodiment of the present invention.
  • FIG. 3 is a flowchart of a clock synchronization method according to a third embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a communication system in a third embodiment of the present invention.
  • FIG. 1 is a flowchart of a clock synchronization method according to a first embodiment of the present invention. As shown in FIG. 1, the clock synchronization method provided in this embodiment includes the following steps:
  • S101 Acquire clock synchronization information of a neighboring base station, where the clock synchronization information includes a clock synchronization object and a clock synchronization level.
  • the acquisition timing can be performed periodically or manually by a maintenance personnel
  • S102 Determine a target base station according to clock synchronization information of the neighboring base station.
  • the embodiment shown in FIG. 1 may further include: updating a clock synchronization object in the clock synchronization information of the base station as a target base station, and a clock synchronization level being a clock synchronization level of the target base station+ 1.
  • the embodiment shown in FIG. 1 further includes: if the clock synchronization information of the neighboring base station is not obtained, or the target base station is not determined according to the clock synchronization information of the neighboring base station, setting the clock synchronization information of the base station to be invalid. .
  • the step of acquiring the clock synchronization information of the neighboring cell in the embodiment shown in FIG. 1 includes: monitoring the broadcast information of the neighboring cell, determining the global identifier of the neighboring cell according to the broadcast information, and communicating with the neighboring cell base station according to the global identifier, Obtain clock synchronization information of the neighboring base station.
  • the embodiment shown in FIG. 1 further includes: determining whether the base station is in a synchronization state, and if not, determining the target base station according to the clock synchronization information of the neighboring base station. .
  • the step of determining the target base station according to the clock synchronization information of the neighboring base station in the embodiment shown in FIG. 1 includes: determining, according to the clock synchronization information of the neighboring base station, that the clock synchronization object is not the local base station
  • the base station to be selected selects the base station with the lowest clock synchronization level from all the base stations to be selected as the target base station.
  • the foregoing embodiment further includes: if the base station is in a synchronization state, determining, according to the clock synchronization information of the neighboring base station, whether the current synchronization object is interlocked with the local base station, and if yes, reselecting according to the clock synchronization information of the neighboring base station.
  • Target base station if the base station is in a synchronization state, determining, according to the clock synchronization information of the neighboring base station, whether the current synchronization object is interlocked with the local base station, and if yes, reselecting according to the clock synchronization information of the neighboring base station.
  • the step of determining whether the current synchronization object is interlocked with the local base station according to the clock synchronization information of the neighboring base station in the foregoing embodiment includes: determining whether the clock synchronization object in the clock synchronization information of the current synchronization object is the base station, and if so, Then, it is determined that the current synchronization object is interlocked with the local base station; or, whether the clock synchronization level in the clock synchronization information of the current synchronization object is greater than a threshold, and if yes, determining that the current synchronization object is interlocked with the local base station.
  • the clock synchronization apparatus 2 is a schematic diagram of a clock synchronization apparatus according to a second embodiment of the present invention.
  • the clock synchronization apparatus 2 provided in this embodiment includes: an acquisition module 21, a determination module 22, and a synchronization module 23, where:
  • the obtaining module 21 is configured to acquire clock synchronization information of the neighboring base station, where the clock synchronization information includes a clock synchronization object and a clock synchronization level;
  • the determining module 22 is configured to determine the target base station according to the clock synchronization information of the neighboring base station;
  • the synchronization module 23 is configured to perform clock synchronization with the target base station.
  • the synchronization module 23 in the embodiment shown in FIG. 2 is further configured to: after clock synchronization with the target base station, update the clock synchronization object in the clock synchronization information of the base station to be the target base station, and the clock synchronization level is the target base station. Clock synchronization level +1.
  • the synchronization module 23 in the embodiment shown in FIG. 2 is further configured to: when the acquiring module does not obtain the clock synchronization information of the neighboring base station, or the determining module does not determine according to the clock synchronization information of the neighboring base station.
  • the clock synchronization information of the base station is set to be invalid.
  • the acquiring module 21 in the embodiment shown in FIG. 2 is configured to monitor broadcast information of a neighboring cell, determine a global identifier of the neighboring cell according to the broadcast information, and obtain a clock of the neighboring base station according to the global identifier and the neighboring base station. Synchronization information.
  • the determining module 22 in the embodiment shown in FIG. 2 is further configured to determine whether the base station is in a synchronization state, and if not, determine the target base station according to the clock synchronization information of the neighboring base station.
  • the determining module 22 in the embodiment shown in FIG. 2 is configured to determine, according to the clock synchronization information of the neighboring base station, that the clock synchronization object is not the base station to be selected, and select the lowest clock synchronization level from all the to-be-selected base stations.
  • the base station serves as a target base station.
  • the determining module 22 in the embodiment shown in FIG. 2 is further configured to determine, according to the clock synchronization information of the neighboring base station, whether the current synchronization object is interlocked with the base station, and if so, according to the neighboring base station.
  • the clock synchronization information of the area base station reselects the target base station.
  • the determining module 22 in the embodiment shown in FIG. 2 determines whether the current synchronization object is interlocked with the base station according to the clock synchronization information of the neighboring base station, and includes: determining a clock synchronization object in the clock synchronization information of the current synchronization object. Whether it is the base station, if yes, determining whether the current synchronization object is interlocked with the local base station; or determining whether the clock synchronization level in the clock synchronization information of the current synchronization object is greater than a threshold, and if so, determining that the current synchronization object is interlocked with the local base station.
  • the embodiment of the invention further provides a base station, which comprises the above clock synchronization device.
  • the embodiment of the invention further provides a communication system, which comprises the above base station.
  • the communication system includes five base stations: a base station a, a base station b, a base station c, a base station d, and a base station e.
  • the base station a uses a GPS timing method for clock synchronization, that is, the clock source is a standard clock source, and the base station is a base station.
  • the base station c, the base station d, and the base station e use the air interface synchronization technology for clock synchronization; as shown in FIG. 4(A), in the related art, since the base station c and the base station d are mutually synchronized targets, the clock thereof will have an error.
  • the base station e selects the base station d as the synchronization target, the acquired clock is also wrong. This will result in the clocks in the network being unable to be strictly synchronized, causing mutual interference.
  • the base station e selects the base station d to synchronize, the base station has a large number of synchronization hops, and the clock error is large. .
  • FIG. 3 is a flowchart of a clock synchronization method according to a third embodiment of the present invention. As shown in FIG. 3, the clock synchronization method in this embodiment includes the following steps:
  • S301 The communication system works, and the base station is powered on in turn;
  • the base station a adopts GPS timing, acquires a standard clock, and updates its clock synchronization information to the same The step is successful, the synchronization target is a standard clock, and the synchronization level is L0;
  • the base station b monitors the neighboring area broadcast to obtain the clock synchronization information of the base station a, synchronizes with the base station a, updates the clock synchronization information to the synchronization success, the synchronization target is the base station a, the synchronization level is L1, and the base station b monitors the neighboring area ( The cell formed by the base station a broadcasts, acquires the global identifier of the neighboring cell, and communicates with the neighboring base station (base station a) according to the global identifier, and acquires clock synchronization information of the base station a, the neighboring area involved in the following, and the clock of the neighboring base station. The way to synchronize information is the same and will not be described again.
  • the base station c monitors the neighboring cell broadcast to obtain the clock synchronization information of the base station a and the base station b, and determines the synchronization target. It is assumed that the cells formed by the base station a and the base station b are the neighboring cells of the cell formed by the base station c.
  • the clock synchronization information of a is synchronous, the synchronization target is the standard clock, the synchronization level is L0, the clock synchronization information of the base station b is the synchronization success, the synchronization target is the base station a, and the synchronization level is L1, according to the principle that the synchronization level is better. Selecting the base station a as the synchronization target; updating the clock synchronization information to the synchronization success, the synchronization target is the base station a, and the synchronization level is L1;
  • the base station d monitors the neighboring area broadcast to obtain the clock synchronization information of the base station b and the base station c, and determines the synchronization target. It is assumed that the cells formed by the base station b and the base station c are neighbors of the cell formed by the base station d. At this time, the base station b and the base station c have the same clock synchronization information, and select a base station as a synchronization target according to the signal strength, for example, the base station c; update its clock synchronization information to be successful, the synchronization target is the base station c, and the synchronization level is L2;
  • the base station e monitors the neighboring area broadcast to obtain the clock synchronization information of the base station b and the base station d, and determines the synchronization target. It is assumed that the cells formed by the base station b and the base station d are neighbors of the cell formed by the base station e. b and the clock synchronization information of the base station d are different. According to the principle that the synchronization level is better, the base station b is selected as the synchronization target; the clock synchronization information is updated successfully, the synchronization target is the base station b, and the synchronization level is L2;
  • S307 Periodically perform clock synchronization to avoid clock error.
  • the synchronization target and the synchronization level of each base station are as shown in FIG. 4(B).
  • the synchronization level is earlier, then the base station synchronizes the hop. The number is small and the clock synchronization error is small.
  • the base station c may select the base station d to enter The air interface is synchronized. If d is synchronized with the base station c, the base stations c and d are interlocked and the clocks are synchronized with each other. If the interlock occurs, the synchronization level of the base station c is L1, and the synchronization level of the base station d is L2;
  • Embodiments of the present invention provide various determinations as to whether an interlock occurs, as follows:
  • the base station c receives the clock synchronization information of the base station d as the synchronization success, the synchronization target is the base station c, and the synchronization level is L2. If the base station c synchronizes with the base station d, an interlock occurs, and the base station c needs to reselect the synchronization. Target, and temporarily set the synchronization state to invalid, so that the base station c and the base station d interlock can be released; when the base station a station recovers, the base station c reselects the base station a process synchronization, the interlock is released and restored to (B) in FIG. Case;
  • the base station c when the base station c is in the synchronous state, periodically monitors the neighboring area information and acquires the level of the neighboring area d as L2, and updates the self level to L3; the base station d also acquires the synchronous target base station c in the same manner as the L3, then the base station d update level is L4. Assuming that the threshold is limited to a maximum level of L4, when the base station c station updates its own level again, the maximum level is exceeded. At this time, the synchronization target needs to be reselected, and the synchronization status is temporarily set to be invalid, so that the base station c and the base station d can be unlocked.
  • the base station when the base station needs to perform clock synchronization, the clock synchronization information of the neighboring base station is acquired, and the synchronization target is selected according to the clock synchronization information, instead of blindly directly contacting the neighboring area.
  • the base station acts as a synchronization target for clock synchronization, avoiding the occurrence of interlocking phenomena;
  • the clock synchronization information of the neighboring base station is acquired, and the synchronization target is selected according to the clock synchronization information, instead of blindly directly synchronizing the neighboring base station as a clock synchronization as in the related art.
  • the goal is to avoid the occurrence of interlocks.

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Abstract

一种时钟同步方法、装置、基站及通信系统，所述方法包括：获取邻区基站的时钟同步信息，时钟同步信息包括时钟同步对象及时钟同步层级；根据邻区基站的时钟同步信息确定目标基站；与目标基站进行时钟同步。所述装置包括获取模块、确定模块和同步模块。

Description

时钟同步方法、装置、基站及通信系统 技术领域
本文涉及通信系统内基站时钟的同步领域，尤其涉及一种时钟同步方法、装置、基站及通信系统。
背景技术
基站之间采用空口同步技术进行时钟同步已经普及，其相对于GPS和1588等时钟方案对基站硬件要求低，但是对无线网络环境更加敏感；相关技术的空口同步方案是基站直接选择邻区基站作为同步目标进行时钟同步，同步目标的选择不当，如两个基站互为同步目标时，就会出现互锁问题，导致基站时钟异常，进而会导致空口同步异常，以至于网络中时钟无法严格同步，造成互相干扰。
发明内容
本发明实施例提供了一种时钟同步方法、装置、基站及通信系统，可以实现根据邻区基站的时钟通信信息选取同步目标。
本发明实施例提供了一种时钟同步方法，该方法包括：获取邻区基站的时钟同步信息，时钟同步信息包括时钟同步对象及时钟同步层级；根据邻区基站的时钟同步信息确定目标基站；与目标基站进行时钟同步。
可选地，上述实施例在与目标基站进行时钟同步之后，还包括：更新本基站的时钟同步信息中的时钟同步对象为目标基站，时钟同步层级为目标基站的时钟同步层级+1。
可选地，上述实施例还包括：若未获取到邻区基站的时钟同步信息，或者根据邻区基站的时钟同步信息未确定到目标基站，则设置本基站的时钟同步信息为无效。
可选地，上述实施例中的获取邻区基站的时钟同步信息的步骤包括：监听邻区的广播信息，根据广播信息确定邻区的全局标识，根据全局标识与邻 区基站通信，获取邻区基站的时钟同步信息。
可选地，上述实施例在根据邻区基站的时钟同步信息确定目标基站之前，还包括：判断本基站是否处于同步状态，若否，则根据邻区基站的时钟同步信息确定目标基站。
可选地，上述实施例中的根据邻区基站的时钟同步信息确定目标基站的步骤包括：根据邻区基站的时钟同步信息确定时钟同步对象不是本基站的待选择基站，从所有待选择基站中选择时钟同步层级最低的基站作为目标基站。
可选地，上述实施例还包括：若本基站处于同步状态，则根据邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁，若是，则根据邻区基站的时钟同步信息重新选择目标基站。
可选地，上述实施例中的根据邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁的步骤包括：判断当前同步对象的时钟同步信息中时钟同步对象是否为本基站，若是，则确定当前同步对象与本基站互锁；或者，判断当前同步对象的时钟同步信息中时钟同步层级是否大于阈值，若是，则确定当前同步对象与本基站互锁。
本发明实施例还提供了一种时钟同步装置，在一个实施例中，其包括：获取模块，设置为获取邻区基站的时钟同步信息，时钟同步信息包括时钟同步对象及时钟同步层级；确定模块，设置为根据邻区基站的时钟同步信息确定目标基站；以及同步模块，设置为与目标基站进行时钟同步。
可选地，上述实施例中的同步模块还设置为在与目标基站进行时钟同步之后，更新本基站的时钟同步信息中的时钟同步对象为目标基站，时钟同步层级为目标基站的时钟同步层级+1。
可选地，上述实施例中的同步模块还设置为当所述获取模块未获取到邻区基站的时钟同步信息，或者所述确定模块根据邻区基站的时钟同步信息未确定到目标基站时，则设置本基站的时钟同步信息为无效。
可选地，上述实施例中的获取模块是设置为监听邻区的广播信息，根据广播信息确定邻区的全局标识，根据全局标识与邻区基站通信，获取邻区基 站的时钟同步信息。
可选地，上述实施例中的确定模块还设置为判断本基站是否处于同步状态，若否，则根据邻区基站的时钟同步信息确定目标基站。
可选地，上述实施例中的确定模块是设置为根据邻区基站的时钟同步信息确定时钟同步对象不是本基站的待选择基站，从所有待选择基站中选择时钟同步层级最低的基站作为目标基站。
可选地，上述实施例中的确定模块还设置为若本基站处于同步状态，则根据邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁，若是，则根据邻区基站的时钟同步信息重新选择目标基站。
可选地，上述实施例中的确定模块根据所述邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁，包括：判断当前同步对象的时钟同步信息中时钟同步对象是否为本基站，若是，则确定当前同步对象与本基站互锁；或者，判断当前同步对象的时钟同步信息中时钟同步层级是否大于阈值，若是，则确定当前同步对象与本基站互锁。
本发明实施例还提供了一种基站，其包括上述时钟同步装置。
本发明实施例还提供了一种通信系统，其包括上述的基站。
本发明实施例还提供一种计算机可读存储介质，存储有程序指令，当该程序指令被执行时可实现上述方法。
本发明实施例提供的方案，通过控制选择的同步目标来降低基站时钟异常，在基站需要进行时钟同步时，获取邻区基站的时钟同步信息，根据该时钟同步信息进行同步目标的选择，而并非如相关技术盲目直接将邻区基站作为时钟同步的同步目标，避免了互锁现象的出现；可选地，还可以根据邻区基站的时钟同步信息确定本基站是否发生了互锁，并在发生互锁时，重新选择同步目标。
附图概述
图1为本发明第一实施例提供的时钟同步方法的流程图；
图2为本发明第二实施例提供的时钟同步装置的示意图；
图3为本发明第三实施例提供的时钟同步方法的流程图；
图4为本发明第三实施例中通信系统的示意图。
本发明的实施方式
第一实施例：
图1为本发明第一实施例提供的时钟同步方法的流程图，由图1可知，在本实施例提供的时钟同步方法包括以下步骤：
S101：获取邻区基站的时钟同步信息，时钟同步信息包括时钟同步对象及时钟同步层级；
获取时机可以是周期性执行，或者维护人员手动触发；
S102：根据邻区基站的时钟同步信息确定目标基站；
S103：与目标基站进行时钟同步。
可选地，图1所示实施例在与目标基站进行时钟同步之后，还可以包括：更新本基站的时钟同步信息中的时钟同步对象为目标基站，时钟同步层级为目标基站的时钟同步层级+1。
可选地，图1所示实施例还包括：若未获取到邻区基站的时钟同步信息，或者根据邻区基站的时钟同步信息未确定到目标基站，则设置本基站的时钟同步信息为无效。
可选地，图1所示实施例中的获取邻区基站的时钟同步信息的步骤包括：监听邻区的广播信息，根据广播信息确定邻区的全局标识，根据全局标识与邻区基站通信，获取邻区基站的时钟同步信息。
可选地，图1所示实施例在根据邻区基站的时钟同步信息确定目标基站之前，还包括：判断本基站是否处于同步状态，若否，则根据邻区基站的时钟同步信息确定目标基站。
可选地，图1所示实施例中的根据邻区基站的时钟同步信息确定目标基站的步骤包括：根据邻区基站的时钟同步信息确定时钟同步对象不是本基站 的待选择基站，从所有待选择基站中选择时钟同步层级最低的基站作为目标基站。
可选地，上述实施例还包括：若本基站处于同步状态，则根据邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁，若是，则根据邻区基站的时钟同步信息重新选择目标基站。
可选地，上述实施例中的根据邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁的步骤包括：判断当前同步对象的时钟同步信息中时钟同步对象是否为本基站，若是，则确定当前同步对象与本基站互锁；或者，判断当前同步对象的时钟同步信息中时钟同步层级是否大于阈值，若是，则确定当前同步对象与本基站互锁。
第二实施例：
图2为本发明第二实施例提供的时钟同步装置的示意图，由图2可知，在本实施例提供的时钟同步装置2包括：获取模块21、确定模块22及同步模块23，其中：
获取模块21，设置为获取邻区基站的时钟同步信息，时钟同步信息包括时钟同步对象及时钟同步层级；
确定模块22，设置为根据邻区基站的时钟同步信息确定目标基站；
同步模块23，设置为与目标基站进行时钟同步。
可选地，图2所示实施例中的同步模块23还设置为在与目标基站进行时钟同步之后，更新本基站的时钟同步信息中的时钟同步对象为目标基站，时钟同步层级为目标基站的时钟同步层级+1。
可选地，图2所示实施例中的同步模块23还设置为当所述获取模块未获取到邻区基站的时钟同步信息，或者所述确定模块根据邻区基站的时钟同步信息未确定到目标基站时，设置本基站的时钟同步信息为无效。
可选地，图2所示实施例中的获取模块21是设置为监听邻区的广播信息，根据广播信息确定邻区的全局标识，根据全局标识与邻区基站通信，获取邻区基站的时钟同步信息。
可选地，图2所示实施例中的确定模块22还设置为判断本基站是否处于同步状态，若否，则根据邻区基站的时钟同步信息确定目标基站。
可选地，图2所示实施例中的确定模块22是设置为根据邻区基站的时钟同步信息确定时钟同步对象不是本基站的待选择基站，从所有待选择基站中选择时钟同步层级最低的基站作为目标基站。
可选地，图2所示实施例中的确定模块22还设置为若本基站处于同步状态，则根据邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁，若是，则根据邻区基站的时钟同步信息重新选择目标基站。
可选地，图2所示实施例中的确定模块22根据所述邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁，包括：判断当前同步对象的时钟同步信息中时钟同步对象是否为本基站，若是，则确定当前同步对象与本基站互锁；或者，判断当前同步对象的时钟同步信息中时钟同步层级是否大于阈值，若是，则确定当前同步对象与本基站互锁。
本发明实施例还提供了一种基站，其包括上述时钟同步装置。
本发明实施例还提供了一种通信系统，其包括上述基站。
第三实施例：
如图4所示，通信系统包括基站a、基站b、基站c、基站d及基站e这5个基站，其中基站a采用GPS授时方式进行时钟同步，也即其时钟源为标准时钟源，基站b、基站c、基站d及基站e采用空口同步技术进行时钟同步；如图4中(A)所示，在相关技术中，由于基站c与基站d互为同步目标，其时钟将存在错误，若基站e选择基站d作为同步目标，获取的时钟也是错误的，这样就会导致网络中时钟无法严格同步，造成互相干扰，基站e选择基站d同步，基站同步跳数较大，时钟误差较大。
图3为本发明第三实施例提供的时钟同步方法的流程图，由图3可知，在本实施例的时钟同步方法包括以下步骤：
S301：通信系统工作，基站依次上电；
S302：基站a采用GPS授时，获取标准时钟，更新其时钟同步信息为同 步成功，同步目标为标准时钟，同步层级为L0；
S303：基站b监听邻区广播，以获取基站a的时钟同步信息，与基站a进行同步，更新其时钟同步信息为同步成功，同步目标为基站a，同步层级为L1；基站b监听邻区(基站a所形成的小区)广播，获取邻区的全局标识，根据全局标识与邻区基站(基站a)通信，获取基站a的时钟同步信息，下文所涉及的邻区及获取邻区基站的时钟同步信息的方式相同，不再赘述；
S304：基站c监听邻区广播，以获取基站a及基站b的时钟同步信息，确定同步目标；假定基站a及基站b分别形成的小区均为基站c所形成小区的邻区，此时，基站a的时钟同步信息为同步成功，同步目标为标准时钟，同步层级为L0，基站b的时钟同步信息为同步成功，同步目标为基站a，同步层级为L1，根据同步层级越前越好的原则，选择基站a为同步目标；更新其时钟同步信息为同步成功，同步目标为基站a，同步层级为L1；
S305：基站d监听邻区广播，以获取基站b及基站c的时钟同步信息，确定同步目标；假定基站b及基站c分别形成的小区均为基站d所形成小区的邻区，此时，基站b及基站c的时钟同步信息相同，根据信号强度选择一个基站作为同步目标，例如基站c；更新其时钟同步信息为同步成功，同步目标为基站c，同步层级为L2；
S306：基站e监听邻区广播，以获取基站b及基站d的时钟同步信息，确定同步目标；假定基站b及基站d分别形成的小区均为基站e所形成小区的邻区，此时，基站b及基站d的时钟同步信息不相同，根据同步层级越前越好的原则，选择基站b为同步目标；更新其时钟同步信息为同步成功，同步目标为基站b，同步层级为L2；
S307：周期性进行时钟同步，避免时钟出现误差。
采用上述时钟同步方法，每个基站的同步目标及同步层级如图4中(B)所示，与如图4中(A)相比，针对基站e，同步层级较前，那么基站同步的跳数就少，时钟同步误差就小。
上述实施例没有涉及互锁的识别及解锁，现结合图4进行说明：
如图4中(A)所示，当基站a发生异常时，基站c可能会选择基站d进 行空口同步，如果d原来就和基站c进行同步，就会导致基站c、d发生了互锁，时钟相互同步，假设发生互锁时，基站c的同步层级为L1，基站d的同步层级为L2；
本发明实施例提供了多种判断是否发生互锁，如下：
如，基站c接收到基站d的时钟同步信息为同步成功，同步目标为基站c，同步层级为L2，若基站c与基站d进行同步，就会发生互锁，此时基站c需要重新选择同步目标，并暂时将同步状态设置为无效，这样基站c和基站d互锁可以解除；当基站a站恢复时，基站c重新选择基站a进程同步，互锁解除并恢复为图4中(B)的情况；
又如基站c在同步状态下，周期监听邻区信息并获取邻区d的层级为L2时，更新自身层级为L3；基站d也会通过同样的方式获取同步目标基站c层级为L3，那么基站d更新层级为L4。假设阈值限制最大层级为L4，当基站c站再次更新自身层级时超过最大层级，此时需要重新选择同步目标，并暂时将同步状态设置为无效，这样基站c和基站d互锁可以解除。
综上可知，通过本发明实施例的实施，在基站需要进行时钟同步时，获取邻区基站的时钟同步信息，根据该时钟同步信息进行同步目标的选择，而并非如相关技术盲目直接将邻区基站作为时钟同步的同步目标，避免了互锁现象的出现；
可选地，还可以根据邻区基站的时钟同步信息确定本基站是否发生了互锁，并在发生互锁时，重新选择同步目标。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件完成，上述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。本发明实施例不限制于任何特定形式的硬件和软件的结合。
工业实用性
通过本发明实施例，在基站需要进行时钟同步时，获取邻区基站的时钟同步信息，根据该时钟同步信息进行同步目标的选择，而并非如相关技术盲目直接将邻区基站作为时钟同步的同步目标，避免了互锁现象的出现。

Claims (19)

  1. 一种时钟同步方法，包括：
    获取邻区基站的时钟同步信息，所述时钟同步信息包括时钟同步对象及时钟同步层级；
    根据所述邻区基站的时钟同步信息确定目标基站；
    与所述目标基站进行时钟同步。
  2. 如权利要求1所述的时钟同步方法，在与所述目标基站进行时钟同步之后，所述方法还包括：更新本基站的时钟同步信息中的时钟同步对象为所述目标基站，时钟同步层级为所述目标基站的时钟同步层级+1。
  3. 如权利要求1所述的时钟同步方法，所述方法还包括：若未获取到所述邻区基站的时钟同步信息，或者根据所述邻区基站的时钟同步信息未确定到目标基站，则设置本基站的时钟同步信息为无效。
  4. 如权利要求1所述的时钟同步方法，所述获取邻区基站的时钟同步信息的步骤包括：监听邻区的广播信息，根据所述广播信息确定所述邻区的全局标识，根据所述全局标识与邻区基站通信，获取所述邻区基站的时钟同步信息。
  5. 如权利要求1至4任一项所述的时钟同步方法，在根据所述邻区基站的时钟同步信息确定目标基站之前，所述方法还包括：判断本基站是否处于同步状态，若否，则根据所述邻区基站的时钟同步信息确定目标基站。
  6. 如权利要求5所述的时钟同步方法，其中，所述根据所述邻区基站的时钟同步信息确定目标基站的步骤包括：根据所述邻区基站的时钟同步信息确定时钟同步对象不是本基站的待选择基站，从所有待选择基站中选择时钟同步层级最低的基站作为所述目标基站。
  7. 如权利要求5所述的时钟同步方法，所述方法还包括：若本基站处于同步状态，则根据所述邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁，若是，则根据所述邻区基站的时钟同步信息重新选择目标基站。
  8. 如权利要求7所述的时钟同步方法，其中，根据所述邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁的步骤包括：判断所述当前同 步对象的时钟同步信息中时钟同步对象是否为本基站，若是，则确定所述当前同步对象与本基站互锁；或者，判断所述当前同步对象的时钟同步信息中时钟同步层级是否大于阈值，若是，则确定所述当前同步对象与本基站互锁。
  9. 一种时钟同步装置，包括：
    获取模块，设置为获取邻区基站的时钟同步信息，所述时钟同步信息包括时钟同步对象及时钟同步层级；
    确定模块，设置为根据所述邻区基站的时钟同步信息确定目标基站；以及
    同步模块，设置为与所述目标基站进行时钟同步。
  10. 如权利要求9所述的时钟同步装置，所述同步模块还设置为在与所述目标基站进行时钟同步之后，更新本基站的时钟同步信息中的时钟同步对象为所述目标基站，时钟同步层级为所述目标基站的时钟同步层级+1。
  11. 如权利要求9所述的时钟同步装置，所述同步模块还设置为当所述获取模块未获取到所述邻区基站的时钟同步信息，或者所述确定模块根据所述邻区基站的时钟同步信息未确定到目标基站时，设置本基站的时钟同步信息为无效。
  12. 如权利要求9所述的时钟同步装置，所述获取模块是设置为监听邻区的广播信息，根据所述广播信息确定所述邻区的全局标识，根据所述全局标识与邻区基站通信，获取所述邻区基站的时钟同步信息。
  13. 如权利要求9至12任一项所述的时钟同步装置，所述确定模块还设置为判断本基站是否处于同步状态，若否，则根据所述邻区基站的时钟同步信息确定目标基站。
  14. 如权利要求13所述的时钟同步装置，所述确定模块是设置为根据所述邻区基站的时钟同步信息确定时钟同步对象不是本基站的待选择基站，从所有待选择基站中选择时钟同步层级最低的基站作为所述目标基站。
  15. 如权利要求13所述的时钟同步装置，所述确定模块还设置为若本基站处于同步状态，则根据所述邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁，若是，则根据所述邻区基站的时钟同步信息重新选择目标 基站。
  16. 如权利要求15所述的时钟同步装置，所述确定模块根据所述邻区基站的时钟同步信息判断当前同步对象是否与本基站互锁，包括：判断所述当前同步对象的时钟同步信息中时钟同步对象是否为本基站，若是，则确定所述当前同步对象与本基站互锁；或者，判断所述当前同步对象的时钟同步信息中时钟同步层级是否大于阈值，若是，则确定所述当前同步对象与本基站互锁。
  17. 一种基站，包括如权利要求9至16任一项所述的时钟同步装置。
  18. 一种通信系统，包括如权利要求17所述的基站。
  19. 一种计算机可读存储介质，存储有程序指令，当该程序指令被执行时可实现权利要求1-8任一项所述的方法。
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US11025473B2 (en) * 2016-10-24 2021-06-01 Qualcomm Incorporated Techniques for use in reverse time alignment
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