WO2011144066A2 - 时钟同步的方法及装置 - Google Patents

时钟同步的方法及装置 Download PDF

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Publication number
WO2011144066A2
WO2011144066A2 PCT/CN2011/074527 CN2011074527W WO2011144066A2 WO 2011144066 A2 WO2011144066 A2 WO 2011144066A2 CN 2011074527 W CN2011074527 W CN 2011074527W WO 2011144066 A2 WO2011144066 A2 WO 2011144066A2
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clock synchronization
clock
synchronization
level
access point
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PCT/CN2011/074527
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English (en)
French (fr)
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WO2011144066A3 (zh
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杨景军
吴宇春
高承伟
王丰
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华为技术有限公司
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Priority to CN2011800005137A priority Critical patent/CN102440031A/zh
Priority to PCT/CN2011/074527 priority patent/WO2011144066A2/zh
Publication of WO2011144066A2 publication Critical patent/WO2011144066A2/zh
Publication of WO2011144066A3 publication Critical patent/WO2011144066A3/zh

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G7/00—Synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master

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  • the present invention relates to the field of network communications, and in particular, to a method and apparatus for clock synchronization.
  • the enterprise-level Femto synchronization methods generally include: GPS, 1588V2 and air interface synchronization. Synchronize macro networks over air interfaces, or synchronize clocks between Femto devices. Femto here refers broadly to home coverage solutions, including access points (Access). In addition to Point, AP, some other devices that are integrated on the network side. Enterprise-level Femto air interface synchronization involves synchronization source selection between multiple APs. Possible scenarios include:
  • All APs can detect the macro station signal
  • the AP that cannot detect the macro station signal can detect other APs in the same enterprise; the AP that cannot detect the macro station signal cannot detect other APs in the same enterprise, and there are multiple discontinuous ones in the enterprise.
  • the clock synchronization deployment has several methods such as home orphan coverage, enterprise non-continuous coverage, and enterprise continuous coverage.
  • the synchronization implementation includes GPS synchronization, synchronous macro network clock, 1588V2 clock synchronization, and Femto access point AP.
  • Several separate ways or combinations of clock synchronization and free oscillation In the prior art, for some or all of the above-mentioned second and third scenarios, the Femto cannot synchronize the macro network, and it is necessary to manually intervene to configure the specified synchronization mode through the AP management server (APM).
  • the clock synchronization between APs is complicated. The plug-and-play and configuration-free features of the AP are greatly challenged. Once the AP is reset, faulty, or the wireless environment changes, it needs to be reconfigured to bring maintenance work. A lot of work, there is still the risk of not being timely.
  • the embodiment of the invention provides a method and a device for clock synchronization.
  • the AP automatically forms an optimal clock synchronization network in various complicated scenarios, and maintains the plug-and-play of the AP. Free configuration features reduce system maintenance effort.
  • the embodiment of the invention provides a method for clock synchronization, the method comprising:
  • the AP adjacent to the access point AP uses the received AP with a higher clock synchronization level as a clock synchronization source to complete clock synchronization with the synchronization source.
  • the embodiment of the invention further provides a device for clock synchronization, the device comprising:
  • a clock synchronization level broadcast unit configured to broadcast a clock synchronization level of the access point AP under the Femto in a system broadcast message of the pico base station Femto;
  • the synchronization source selection unit is configured to use the received AP with a higher clock synchronization level as a clock synchronization source to complete clock synchronization with the synchronization source.
  • the method broadcasts a clock synchronization level of the access point AP under the Femto in a system broadcast message of the femto of the femto base station; an AP that is adjacent to the access point AP
  • the received AP with a higher clock synchronization level is used as the clock synchronization source to complete the clock synchronization with the synchronization source.
  • the AP automatically forms an optimal clock synchronization network in various complicated scenarios, and maintains the plug-and-play and configuration-free features of the AP, thereby reducing the system maintenance workload.
  • FIG. 1 is a schematic flowchart of a clock synchronization method according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a clock synchronization apparatus according to an embodiment of the present invention.
  • the embodiment of the invention provides a method and a device for clock synchronization.
  • the coverage area of an enterprise-level AP is generally an AP of the same device vendor. Therefore, the convenience of the user can be used to broadcast the clock synchronization level of the AP in the system broadcast message of the Femto cell, and the AP can synchronize the clock synchronization information of the neighboring APs.
  • the AP acts as a synchronization source to build the best clock synchronization network.
  • the continuous coverage of the enterprise can cover several other scenarios.
  • the orphaned coverage can be regarded as two cases in which a macro station is detected in a continuous coverage and a macro station is not detected; each area of the discontinuous coverage of the enterprise may be an isolated point or a continuous coverage area, so the embodiment of the present invention may focus on Analyze the scenarios in which the enterprise continuously covers.
  • FIG. 1 is a schematic flowchart of a clock synchronization method according to an embodiment of the present invention. The method includes:
  • Step 11 Broadcast the clock synchronization level of the access point AP under Femto in the system broadcast message of the pico base station Femto.
  • the access point AP of the femto base station Femto selects the synchronization source for clock synchronization, and then broadcasts the clock synchronization level of the access point AP, which can be utilized in the system broadcast message of the femto base station Femto without affecting the user.
  • the optional field of the UE is used to broadcast the clock synchronization level information.
  • the access point AP can detect the macro station, the macro station is synchronized, and the clock synchronization level of the access point AP is broadcasted to level 1, and it is assumed that the clock synchronization level of the macro station is level 0, which is determined by the frequency band. of;
  • the access point AP cannot detect the macro station, select the AP with the highest clock synchronization level as the synchronization source for synchronization, and set the clock synchronization level of the access point AP to the clock synchronization level of the synchronization source plus one.
  • the clock synchronization level of the access point AP is broadcast again.
  • the synchronizing the AP with the highest clock synchronization level as the synchronization source includes: selecting an AP whose clock source is a macro network, or an AP whose clock source is a self-oscillation source as a synchronization source.
  • the sorting selection may be performed according to the signal priority, that is, the target AP whose signal priority is prior is preferentially selected.
  • the access point AP does not detect the macro station and does not detect other APs, it uses its own free-running clock, and the clock synchronization level of the broadcast access point AP is M level.
  • the synchronization process of the access point AP is:
  • the synchronization source for reporting the AP to the AP management server APM is the macro station and the macro station ID.
  • the way to calculate the air interface propagation delay T_delay includes two cases:
  • the AP estimates the air interface propagation delay according to the path loss of the macro station to the AP;
  • the second case When the AP has a service bearer:
  • the AP sends an observation time difference SFN-SFN between the AP and the synchronization source to the UE controlled by the AP to perform measurement, SFN-SFN
  • the observation time difference is the difference between the frame reception times of the two access points (the serving cell and the target cell) measured on the UE, and is expressed in units of chips.
  • the AP timing is adjusted forward T_delay.
  • the AP needs to adjust the clock in multiple steps in consideration of the uplink synchronization requirement of the UE.
  • the AP also needs to calculate the delay of the period, and adjust the AP's own clock according to the calculation result, repeating 3 to 4 times, and the period can be seconds or minutes.
  • the access point AP can detect the macro station.
  • the AP that cannot detect the macro station can synchronize with the AP that has been synchronized to the macro station, specifically:
  • the target APs of the level are selected according to the signal priority order;
  • the AP that has performed the clock synchronization re-broadcasts the clock synchronization level of the AP in the optional field of the cell broadcast message SIB, specifically, the clock synchronization level of the synchronization source is increased by 1 for other APs to use as the synchronization reference.
  • the macro station cannot be detected and the AP of other AP signals cannot be detected, then its own free-running clock can be used; the APM is reported, and its clock synchronization level is broadcast in the broadcast information.
  • This situation is mainly used in a single AP or multiple APs. However, if all APs cannot detect a macro station, an AP needs to be used as the source clock, and other APs perform clock synchronization to the AP.
  • Step 12 The AP adjacent to the access point AP uses the received AP with a higher clock synchronization level as the clock synchronization source to complete clock synchronization with the synchronization source.
  • the AP adjacent to the access point AP can parse the received clock. Synchronization level information, and then select the AP with a higher clock synchronization level as the corresponding clock synchronization source to complete the clock synchronization with the synchronization source, thereby constructing an optimal clock synchronization network.
  • the method further includes:
  • the propagation delay of the synchronization object may be periodically calculated, and may be estimated according to the path loss, or by uplink pre-synchronization, or SFN-SFN observation time difference measurement; after obtaining T_delay, the cell is obtained. The clock is adjusted. This T_delay requires a period to calculate and correct.
  • the access point AP may also report the clock synchronization level information and the upper-level clock synchronization level information of the access point AP to the APM, and the APM determines, according to the received information, whether there is a plurality of clock small networks in the same coverage area. If there is a case where there are multiple clock small networks in the same coverage area, the APM promptly indicates that the AP in the closed loop reselects other upper-level clock stations and performs clock synchronization.
  • the indoor propagation delay generally does not exceed one chip, the number of synchronization layers between APs is increased by one, which may cause synchronization error of 1 chip. Therefore, to improve the error caused by the propagation delay between APs, the APs are synchronized.
  • the number of layers should be limited to 4 layers (4 chips).
  • the manner in which the AP synchronizes with the synchronization source may include:
  • the synchronization timing deviation is the propagation delay of the macro station to the AP. Initiating the uplink synchronization to the macro station can compensate the influence of the propagation delay on the AP synchronization error and improve the AP synchronization accuracy.
  • the AP uses the received time of the macro station DwPTS as its own DwPTS transmission time. In this mode, the AP's clock will be delayed compared to the macro station when it propagates.
  • the AP when the AP can detect the macro station and use the macro station as the synchronization source, when the AP provides the service to the UE and cannot perform the air interface synchronization to the macro station, the UE can also perform the SFN-SFN observation time difference measurement by the UE under the control of the AP. The reported time difference is synchronized with the macro station.
  • the embodiment of the present invention further provides a device for clock synchronization, which is disposed on an access point AP, as shown in FIG. 2 is a schematic structural diagram of a clock synchronization device provided, and the device includes:
  • the clock synchronization level broadcast unit 21 is configured to broadcast a clock synchronization level of the access point AP under the Femto in a system broadcast message of the pico base station Femto.
  • the synchronization source selection unit 22 is configured to use the received AP with a higher clock synchronization level as a clock synchronization source to complete clock synchronization with the synchronization source.
  • the apparatus may further include:
  • the clock synchronization level reporting unit 23 is configured to report the clock synchronization level information of the access point AP and the upper clock synchronization level information to the AP management server APM;
  • the clock source small network processing unit 24 is configured to determine, according to the APM, whether there is a plurality of clock source small networks in the same coverage area, and if yes, notify the access point AP to reselect other upper clock stations for synchronization.
  • the device may also include:
  • the period adjusting unit 25 is configured to calculate, during the clock synchronization tracking, the period of time and the propagation delay of the target base station, and perform synchronization adjustment of the clock.
  • the included units are only divided according to functional logic, but are not limited to the foregoing division, as long as the corresponding functions can be implemented; in addition, the specific names of the functional units It is also for convenience of distinguishing from each other and is not intended to limit the scope of protection of the present invention.
  • the storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the embodiment of the present invention automatically forms an optimal clock synchronization network between APs in various complicated scenarios through the idea of self-organization, and maintains the plug-and-play and configuration-free features of the AP. Reduced system maintenance workload.

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Abstract

本发明实施例提供了一种时钟同步的方法及装置。所述方法在微型基站Femto的系统广播消息中广播所述Femto下接入点AP的时钟同步等级；与所述接入点AP相邻的AP将所接收到的时钟同步等级较高的AP作为时钟同步源，完成与该同步源的时钟同步。本实施例通过自组织的思想，在各种复杂的场景中，使AP自动形成一张最佳的时钟同步网络，保持AP的即插即用和免配置特性，降低系统维护工作量。

Description

时钟同步的方法及装置
技术领域
本发明涉及网络通信领域，尤其涉及一种时钟同步的方法及装置。
发明背景
目前，企业级Femto的同步方式一般有：GPS，1588V2及空口同步。通过空口同步宏网络，或者时钟同步Femto设备之间的同步，这里的Femto广义上讲是指家庭覆盖解决方案，除了包括接入点（Access Point ，AP）外，还包括网络侧集成控制的一些其它设备，企业级Femto空口同步涉及到多AP之间的同步源选择问题，可能出现的场景包括：
1）所有AP均能检测到宏站信号；
2）部分AP能检测到宏站信号，其余AP无法检测到宏站信号；
这一场景下又包括：无法检测到宏站信号的AP能检测到同企业的其它AP；无法检测到宏站信号的AP也无法检测到同企业的其它AP，企业内部存在多个不连续的AP覆盖区；
3）所有AP均无法检测到宏站信号。
而时钟同步的部署有家庭孤点覆盖方式、企业非连续覆盖方式和企业连续覆盖方式等几种；同步实现方式有GPS同步、同步宏网络时钟、1588V2时钟同步、Femto接入点AP之间的时钟同步和自由振荡等几种单独方式或者组合方式。目前在现有技术中，对于上述第二、第三种场景下部分或者全部Femto不能同步宏网络的情况，需要由人工进行干预，通过AP管理服务器（APM）来配置指定的同步方式，这就使得AP之间的时钟同步变得复杂，AP的即插即用、免配置特性受到了极大的挑战，一旦AP复位、故障或者无线环境变化，就需要重新进行配置，给维护工作带来了很大的工作量，还存在维护不及时的风险。
发明内容
本发明实施例提供了一种时钟同步的方法及装置，通过自组织的思想，在各种复杂的场景中，使AP自动形成一张最佳的时钟同步网络，保持AP的即插即用和免配置特性，降低系统维护工作量。
本发明实施例提供了一种时钟同步的方法，所述方法包括：
在微型基站Femto的系统广播消息中广播所述Femto下接入点AP的时钟同步等级；
与所述接入点AP相邻的AP将所接收到的时钟同步等级较高的AP作为时钟同步源，完成与该同步源的时钟同步。
本发明实施例还提供了一种时钟同步的装置，所述装置包括：
时钟同步等级广播单元，用于在微型基站Femto的系统广播消息中广播所述Femto下接入点AP的时钟同步等级；
同步源选择单元，用于将所接收到的时钟同步等级较高的AP作为时钟同步源，完成与该同步源的时钟同步。
由上述所提供的技术方案可以看出，所述方法在微型基站Femto的系统广播消息中广播所述Femto下接入点AP的时钟同步等级；与所述接入点AP相邻的AP将所接收到的时钟同步等级较高的AP作为时钟同步源，完成与该同步源的时钟同步。本实施例通过自组织的思想，在各种复杂的场景中，使AP自动形成一张最佳的时钟同步网络，保持AP的即插即用和免配置特性，降低系统维护工作量。
附图简要说明
图1为本发明实施例所提供时钟同步方法的流程示意图；
图2为本发明实施例所提供时钟同步装置的结构示意图。
实施本发明的方式
本发明实施例提供了一种时钟同步的方法及装置，由于企业级AP的成片覆盖区域一般情况下是同一设备商的AP。所以可以利用此便利，在Femto小区的系统广播消息中利用不影响UE的可选字段，来广播本AP的时钟同步等级；同时AP之间可以解析相邻AP的时钟同步信息，选择最佳的AP作为同步源，从而建设最佳时钟同步网络。
在具体实施过程中，企业连续覆盖的情况可以涵盖其它几种场景。比如：孤点覆盖可以看作连续覆盖中检测到宏站和检测不到宏站的两种情况；企业非连续覆盖的每一片区域可以是孤点或连续覆盖区域，所以本发明实施例可以重点分析企业连续覆盖的场景。
为更好的描述本发明实施方式，现结合附图对本发明的具体实施方式进行说明，如图1所示为本发明实施例所提供时钟同步方法的流程示意图，所述方法包括：
步骤11：在微型基站Femto的系统广播消息中广播Femto下接入点AP的时钟同步等级。
在该步骤中，首先，微型基站Femto下的接入点AP选择同步源进行时钟同步，再广播该接入点AP的时钟同步等级，具体可以在微型基站Femto的系统广播消息中利用不影响用户端UE的可选字段来广播该时钟同步等级信息，具体实现中可分为三种情况：
1）若接入点AP能检测到宏站，则同步宏站，并广播本该接入点AP的时钟同步等级为1级，这里假定宏站的时钟同步等级为0级，是通过频段识别的；
2）若接入点AP不能检测到宏站，则选择时钟同步等级最高的AP作为同步源进行同步，并将该接入点AP的时钟同步等级设置成该同步源的时钟同步等级加1，再广播该接入点AP的时钟同步等级。
其中，所述选择时钟同步等级最高的AP作为同步源进行同步包括：选择时钟源头为宏网络的AP，或时钟源头为自振的AP作为同步源进行同步。
另外，若在选择过程中，时钟同步等级相同的目标AP有多个，则可以按照信号优先级进行排序选择，即信号优先级在前的目标AP优先选择。
3）若接入点AP检测不到宏站，也检测不到其它AP，则采用自身的自由振荡时钟，并广播接入点AP的时钟同步等级为M级。
举例来说，以上述第一种情况为例，若接入点AP能检测到宏站，则该接入点AP的同步流程为：
1）通过初始搜索确定宏站同步源。
2）向AP管理服务器APM上报本AP的同步源为宏站及宏站ID。
3）计算空口传播时延T_delay：
这里，计算空口传播时延T_delay的方式包含两种情况：
第一种情况：当接入点AP开机或无业务承载时：
i. AP根据宏站至AP的路损，自己估计空口传播时延；
ii. 通过发起上行接入获得；
第二种情况：当AP有业务承载时：
iii. AP向自己控制的UE下发AP和同步源之间的观测时间差SFN-SFN来进行测量，SFN-SFN 观察时间差是在UE 上测量的两个接入点 (服务小区和目标小区) 帧接收时间的差异，表示时以码片为单位。
iv. 如果UE不能上报与宏站的观察时间差，则业务释放后，进行无业务承载时的同步算法。
4）在AP观察到的同步源下行帧起始时刻的基础上，将AP定时向前调整T_delay。
当有UE接入AP时，考虑到UE的上行同步需求，AP调整时钟时需分多步调整。
5）AP还需要周期计算时延，并根据计算结果调整AP自身时钟，重复3～4次，周期可以是秒级或者分钟级。
上述例子描述了接入点AP能检测到宏站的情况，第二种情况下不能检测到宏站的AP可以向已同步到宏站的AP进行同步，具体来说：
首先向APM上报能检测到的相邻AP，再选择时钟同步等级最高的AP作为同步源，这里包括时钟源头为宏网络的AP或时钟源头为自振的AP，其中若有多个相同时钟同步等级的目标AP，则按照信号优先级排序选择；
然后，已进行时钟同步的AP在其小区广播消息SIB的可选字段中再广播本AP的时钟同步等级，具体为同步源的时钟同步等级加1，以便供其它AP做为同步参考。
第三种情况下，若不能检测到宏站，也不能检测到其他AP信号的AP，则可以采用自身的自由振荡时钟；向APM上报，并在广播信息中广播其时钟同步等级为M。这种情况主要是用在单AP、或者多AP，但所有AP都检测不到宏站的情况下，需要一个AP充当源时钟，其它AP再向这个AP进行时钟同步。
步骤12：与接入点AP相邻的AP将所接收到的时钟同步等级较高的AP作为时钟同步源，完成与该同步源的时钟同步。
在该步骤中，在接入点AP按照上述步骤11的操作完成时钟同步并广播本接入点AP的时钟同步等级之后，与该接入点AP相邻的AP就可以解析所接收到的时钟同步等级信息，再选择时钟同步等级较高的AP作为相应的时钟同步源，完成与该同步源的时钟同步，从而建设最佳的时钟同步网络。
通过上述的时钟同步过程，就可以通过自组织的思想，在各种复杂的场景中，使AP和相邻AP之间自动形成一张最佳的时钟同步网络，保持AP的即插即用和免配置特性，降低系统维护工作量。
另外，所述方法还包括：
在接入点AP进行时钟同步跟踪时，还可以周期计算与同步对象的传播时延，可以根据路损估算，或者通过上行预同步，或者SFN-SFN观察时间差测量；在得到T_delay后，对本小区时钟进行调整，这个T_delay需要周期进行计算和修正。
接入点AP还可以将本接入点AP的时钟同步等级信息、上级时钟同步等级信息上报到APM，由APM根据所接收到的信息判断是否存在同一覆盖区域有多个时钟小网的情况。若存在同一覆盖区域有多个时钟小网的情况，则由APM及时指示闭环中的AP重新选择其他上级时钟站再进行时钟同步。
另外，由于室内传播时延一般不超过1码片chip，AP之间同步层数每加1，可能引起1chip的同步误差，故为提升AP之间传播时延引起的误差，AP之间同步的层数应限制在4层（4chip）以内。
具体实施过程中，在上述步骤11中，AP与同步源进行时钟同步的方式可以包括：
1）向同步源发起上行接入，由同步源调整AP的同步定时偏差，达到AP设备与同步源的时钟同步。同步定时偏差即宏站至AP的传播时延，向宏站发起上行同步能补偿传播时延对AP同步误差的影响，提高AP同步精确度。
2）不向同步源发起上行接入，通过AP侦听同步源的下行信号， AP将宏站DwPTS的接收到时刻作为自己的DwPTS发送时刻。此方式下AP的时钟将比宏站滞后传播时延长度。
另外，在AP能检测到宏站，将宏站作为同步源时，AP向UE提供服务无法向宏站做空口同步时，也可通过AP控制下的UE做SFN-SFN观察时间差测量，通过UE上报的时间差来与宏站同步。
本发明实施例还提供了一种时钟同步的装置，该装置设置在接入点AP上，如图2所示为所提供时钟同步装置的结构示意图，所述装置包括：
时钟同步等级广播单元21，用于在微型基站Femto的系统广播消息中广播所述Femto下接入点AP的时钟同步等级。
同步源选择单元22，用于将所接收到的时钟同步等级较高的AP作为时钟同步源，完成与该同步源的时钟同步。
另外，所述装置还可包括：
时钟同步等级上报单元23，用于将接入点AP的时钟同步等级信息、以及上级时钟同步等级信息上报到AP管理服务器APM；
时钟源小网处理单元24，用于根据所述APM来判断是否存在同一覆盖区域有多个时钟源小网的情况，若存在则通知所述接入点AP重新选择其他上级时钟站进行同步。
所述装置还可包括：
周期调整单元25，用于所述接入点AP在进行时钟同步跟踪时，周期计算与目标基站的传播时延，进行本时钟的同步调整。
上述装置中各单元的具体实现过程可参考上述方法实施例中所述。
值得注意的是，上述装置实施例中，所包括的各个单元只是按照功能逻辑进行划分的，但并不局限于上述的划分，只要能够实现相应的功能即可；另外，各功能单元的具体名称也只是为了便于相互区分，并不用于限制本发明的保护范围。
另外，本领域普通技术人员可以理解实现上述方法实施例中的全部或部分步骤是可以通过程序来指令相关的硬件完成，相应的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
综上所述，本发明实施例通过自组织的思想，在各种复杂的场景中，使AP之间自动形成一张最佳的时钟同步网络，保持AP的即插即用和免配置特性，降低了系统维护工作量。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明实施例揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。

Claims (13)

  1. 一种时钟同步的方法，其特征在于，所述方法包括：
    在微型基站Femto的系统广播消息中广播所述Femto下接入点AP的时钟同步等级；
    与所述接入点AP相邻的AP将所接收到的时钟同步等级较高的AP作为时钟同步源，完成与该同步源的时钟同步。
  2. 如权利要求1所述的方法，其特征在于，所述广播所述Femto下接入点AP的时钟同步等级，具体包括：
    若AP能检测到宏站，则同步宏站，并广播接入点AP的时钟同步等级为1级。
  3. 如权利要求1所述的方法，其特征在于，所述广播所述Femto下接入点AP的时钟同步等级，具体包括：
    若AP不能检测到宏站，则选择时钟同步等级最高的AP作为同步源进行同步，并将该接入点AP的时钟同步等级设置成该同步源的时钟同步等级加1，再广播该接入点AP的时钟同步等级。
  4. 如权利要求3所述的方法，其特征在于，所述选择时钟同步等级最高的AP作为同步源进行同步，具体包括：
    选择时钟源头为宏网络的AP，或时钟源头为自振的AP作为同步源进行同步。
  5. 如权利要求3所述的方法，其特征在于，所述方法还包括：
    若时钟同步等级相同的目标AP有多个，则按照信号优先级进行排序选择。
  6. 如权利要求1所述的方法，其特征在于，所述广播所述Femto下接入点AP的时钟同步等级，具体包括：
    若AP检测不到宏站，也检测不到其它AP，则采用自身的自由振荡时钟，并广播接入点AP的时钟同步等级为M级。
  7. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    将接入点AP的时钟同步等级信息、以及上级时钟同步等级信息上报到AP管理服务器APM；
    根据所述APM来判断是否存在同一覆盖区域有多个时钟源小网的情况，若存在则重新选择其他上级时钟站进行同步。
  8. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    所述接入点AP在进行时钟同步跟踪时，周期计算与目标基站的传播时延，进行本时钟的同步调整。
  9. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    室内传播时延不超过1码片chip，且Femto之间同步的层数限制在4层以内。
  10. 如权利要求1所述的方法，其特征在于，所述在微型基站Femto的系统广播消息中，具体包括：
    在微型基站Femto的系统广播消息中利用不影响用户端UE的可选字段。
  11. 一种时钟同步的装置，其特征在于，所述装置包括：
    时钟同步等级广播单元，用于在微型基站Femto的系统广播消息中广播所述Femto下接入点AP的时钟同步等级；
    同步源选择单元，用于将所接收到的时钟同步等级较高的AP作为时钟同步源，完成与该同步源的时钟同步。
  12. 如权利要求11所述的装置，其特征在于，所述装置还包括：
    时钟同步等级上报单元，用于将接入点AP的时钟同步等级信息、以及上级时钟同步等级信息上报到AP管理服务器APM；
    时钟源小网处理单元，用于根据所述APM来判断是否存在同一覆盖区域有多个时钟源小网的情况，若存在则通知所述接入点AP重新选择其他上级时钟站进行同步。
  13. 如权利要求11所述的装置，其特征在于，所述装置还包括：
    周期调整单元，用于所述接入点AP在进行时钟同步跟踪时，周期计算与目标基站的传播时延，进行本时钟的同步调整。
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