WO2015196723A1 - 室内基站同步方法、装置及系统 - Google Patents
室内基站同步方法、装置及系统 Download PDFInfo
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- WO2015196723A1 WO2015196723A1 PCT/CN2014/092145 CN2014092145W WO2015196723A1 WO 2015196723 A1 WO2015196723 A1 WO 2015196723A1 CN 2014092145 W CN2014092145 W CN 2014092145W WO 2015196723 A1 WO2015196723 A1 WO 2015196723A1
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- the present invention relates to the field of communications, and in particular to a method, device and system for synchronizing indoor base stations.
- Ultra-dense networking is one of the key technologies of the fifth-generation (5G) mobile communication. It deploys a large number of micro-cell base stations in indoor crowd-intensive scenarios such as office buildings, supermarkets, railway stations, stadiums and dense residential areas, improving coverage and increasing
- the data service transmission rate is adapted to the demand of 1000 times of data traffic of 5G mobile communication in the future, and the large-scale deployment of miniaturized base stations indoors has become an important direction for the development of mobile communication in the future.
- the embodiment of the invention provides a method, a device and a system for synchronizing an indoor base station, so as to at least solve the problem that the indoor base station in the related art cannot meet the synchronization requirement of the communication system.
- an indoor base station synchronization method comprising: an indoor base station receiving a synchronization signal transmitted by a set ground pseudolite transmitting apparatus; and the indoor base station acquiring a precise time according to the received synchronization signal The indoor base station performs time synchronization according to the acquired precise time.
- the indoor base station obtains, by the indoor base station, the precise time according to the received synchronization signal, including: when the synchronization signal has multipath arrival, the indoor base station separates the synchronization of the first path arrival from the synchronization signal that arrives at the multipath a signal; the indoor base station obtains the pseudo satellite base station according to a synchronization signal arrival time of the first path arrival a delay value; the indoor base station calculates the precise time according to the precise time information in the synchronization signal and the calculated delay value.
- Receiving, by the indoor base station, the synchronization signal sent by the set pseudolite transmitting device on the ground comprising: the indoor base station receiving the synchronization signal by using a global positioning system GPS receiver of the indoor base station; or the indoor base station using the indoor
- the preset receiver of the base station receives the synchronization signal, wherein the preset receiver is only configured to receive the synchronization signal transmitted by the pseudolite transmitting device.
- the transmission frequency of the synchronization signal is the same as the transmission frequency of the space-based navigation satellite signal.
- an indoor base station synchronization apparatus comprising: a receiving module configured to receive a synchronization signal transmitted by a set ground pseudolite transmitting apparatus; and an obtaining module configured to receive according to the received The synchronization signal acquires a precise time; the synchronization module is configured to perform time synchronization of the indoor base station according to the acquired precise time.
- the obtaining module includes: a separating unit configured to: when the multipath arrival of the synchronization signal arrives, separate a synchronization signal that arrives at the first path from the synchronization signal that arrives at the multipath; and the acquiring unit is configured to be according to the first Obtaining a delay value of the pseudo-satellite base station when the synchronization signal arrives at the arrival time; and the calculating unit is configured to calculate the precise time according to the accurate time information in the synchronization signal and the calculated delay value.
- the receiving module receives the synchronization signal by: receiving the synchronization signal by using a global positioning system GPS receiver of the indoor base station; or receiving the synchronization signal by using a preset receiver of the indoor base station, where The preset receiver is only configured to receive a synchronization signal transmitted by the pseudolite transmitting device.
- an indoor base station synchronization system comprising: a pseudolite transmitting device and one or more indoor base stations; wherein the pseudolite transmitting device is disposed on the ground and configured to transmit a synchronization signal
- the indoor base station includes the indoor base station synchronization device described above, configured to receive the synchronization signal and perform synchronization according to the synchronization signal.
- the pseudolite transmitting device has a transmitting frequency that is the same as the transmitting frequency of the space-based navigation satellite.
- the pseudolite transmitting device has a transmission frequency of 1.56 GHz.
- the maximum distance between the pseudolite transmitting device and the indoor base station is 500 meters.
- the indoor base station receives the synchronization signal from the pseudolite transmitting device disposed on the ground, and performs synchronization according to the synchronization signal. Since the pseudolite transmitting device is disposed on the ground, the distance from the indoor base station is relatively close, The space loss is small, so that the indoor base station receives the synchronization signal strength, so that the indoor base station can reach the synchronization requirement of the communication system, and can improve the synchronization precision between the indoor base stations.
- FIG. 1 is a schematic structural diagram of an indoor base station synchronization system according to an embodiment of the present invention
- FIG. 2 is a schematic diagram showing the arrangement of a pseudolite transmitting device according to an embodiment of the present invention
- FIG. 3 is a schematic structural diagram of an indoor base station synchronization apparatus according to an embodiment of the present invention.
- FIG. 4 is a flowchart of a method for synchronizing indoor base stations according to an embodiment of the present invention
- FIG. 5 is a flow chart of a method for synchronizing indoor base stations in accordance with an alternate embodiment of the present invention.
- the indoor base station synchronizes according to the space-based navigation satellite signal, and the indoor base station cannot meet the synchronization requirement of the communication system.
- the pseudo-satellite transmitting device is used instead of the space-based navigation satellite to transmit the synchronization signal.
- the pseudolite transmitting device is a transmitter arranged to transmit a certain positioning and synchronizing signal on the ground, for example, to transmit a navigation message similar to a GPS signal, and the receiver can use the same method as the GPS signal synchronization. Receive pseudolite signals and synchronize them.
- the pseudo satellite signal can penetrate the indoor and receive for the indoor base station.
- an indoor base station synchronization system is provided.
- FIG. 1 is a schematic structural diagram of an indoor base station synchronization system according to an embodiment of the present invention.
- the system mainly includes: a pseudolite transmitting device 2 and one or more indoor base stations 4; wherein the pseudolite transmitting device 2 is disposed on the ground and configured to transmit a synchronization signal; the indoor base station 4 It is arranged to receive the synchronization signal and perform synchronization according to the synchronization signal.
- the pseudo satellite transmitting device 2 may also be plural.
- the indoor base station 4 may include the indoor base station synchronization device shown in FIG. 3, which will be specifically described below.
- the pseudolite transmission device has a transmission frequency (ie, an operating frequency) that is the same as a transmission frequency of the space-based navigation satellite.
- the transmission frequency of the pseudolite transmitting device may be the transmitting frequency of the GPS, that is, 1.56 GHz.
- a maximum distance between the pseudolite transmitting device and the indoor base station is 500 meters.
- the pseudolite transmitting apparatus may be disposed around an architectural building in which the indoor base station is located, so that the indoor base station can receive the synchronization signal.
- the free space loss of the pseudolite transmitting device to the indoor base station is:
- the penetrating loss of pseudo-satellite signals in indoors has a great relationship with the structure of indoor buildings. Generally, the penetration loss of indoor load-bearing walls is 20 dB, and the penetration loss of wooden partitions is 5 dB. It is assumed that pseudo-satellite signals pass through two load-bearing walls. After reaching the indoor base station with 5 wooden partition walls, the indoor penetration loss is:
- the pseudolite transmitting device Since the pseudolite transmitting device is arranged in a densely populated area, the transmitting power cannot be too high. Taking the transmitting power of 500 mw, that is, 27 dBm as an example, the pseudolite signal strength received by the indoor base station is:
- the satellite signal receiving sensitivity requirement of -160dBm is satisfied, so the pseudolite can cover the indoor environment with a transmission power of 500mw.
- the pseudo-satellite transmitting device transmits the same navigation message signal as the space-based navigation satellite, and the indoor base station receives the pseudo-satellite signal and obtains the accurate system time, thereby realizing synchronization between the base stations.
- an indoor base station synchronization device is further provided, and the device may be located in the indoor base station 4, or may not be disposed in the indoor base station 4, but may be disposed beside the indoor base station 4, and can be connected to the indoor The base station communicates.
- the apparatus mainly includes: a receiving module 32, configured to receive a synchronization signal sent by a set ground pseudolite transmitting apparatus; and an acquiring module. 34. Set to acquire a precise time according to the received synchronization signal; and the synchronization module 36 is configured to perform time synchronization of the indoor base station according to the acquired precise time.
- the obtaining module 34 may include: a separating unit configured to: when the multipath arrival of the synchronization signal arrives, separate the synchronization signal of the first path from the synchronization signal that arrives at the multipath; and acquire the unit, And being configured to acquire a delay value of the pseudo satellite base station according to the arrival time of the synchronization signal that arrives at the first path; and the calculating unit is configured to calculate, according to the accurate time information in the synchronization signal and the calculated delay value, Precise time.
- the receiving module 32 receives the synchronization signal by: receiving the synchronization signal by using a global positioning system GPS receiver of the indoor base station; or using a preset receiver of the indoor base station to receive the synchronization
- the synchronization signal is described, wherein the preset receiver is only configured to receive a synchronization signal transmitted by the pseudolite transmitting device.
- an indoor base station synchronization method is also provided.
- FIG. 4 is a flowchart of a method for synchronizing indoor base stations according to an embodiment of the present invention. As shown in FIG. 4, the method mainly includes the following steps S402 to S406.
- Step S402 the indoor base station receives the synchronization signal sent by the set pseudolite transmitting device on the ground.
- the synchronization signal has a transmission frequency that is the same as a transmission frequency of the space-based navigation satellite signal (eg, a GPS signal).
- the indoor base station may receive the synchronization signal by using a global positioning system (GPS) receiver of the indoor base station; or the indoor base station may also receive the synchronization signal by using a preset receiver of the indoor base station, where The preset receiver is only configured to receive a synchronization signal transmitted by the pseudolite transmitting device.
- GPS global positioning system
- Step S404 the indoor base station acquires a precise time according to the received synchronization signal.
- the indoor base station when performing step S404, first separates the synchronization signal of the first path arrival from the synchronization signal that arrives at the multipath, and then according to the First trail to The arrival time of the synchronization signal arrives at the time delay value of the pseudo satellite base station, and the precise time is calculated according to the precise time information in the synchronization signal and the calculated delay value.
- Step S406 the indoor base station performs time synchronization according to the acquired precise time.
- the indoor base station transmits the synchronization signal by using the outdoor pseudolite transmitting device to synchronize, thereby satisfying the synchronization requirement of the communication system and improving the synchronization precision between the base stations.
- FIG. 5 is a flowchart of a method for synchronizing an indoor base station according to an alternative embodiment of the present invention. As shown in FIG. 5, the method mainly includes the following steps S502 to S510.
- step S502 the outdoor pseudolite transmits a synchronization signal to the indoor, the signal format is the same as the GPS satellite signal, and the working frequency can be the same as the GPS satellite, and a separate working frequency point can also be used.
- the indoor base station receives the pseudolite signal using the GPS receiver, or receives it using an independent pseudolite receiver, and the receiving implementation algorithm is the same as the GPS.
- step S506 since the pseudolite signal propagates indoors, the multipath is reached. Therefore, the indoor base station receiver separates the first path arrival signal from the multipath arrival signal.
- Step S508 the indoor base station calculates a delay value of the pseudo satellite and the indoor base station according to the arrival time of the first path signal.
- Step S510 The indoor base station calculates the precise time obtained by the base station according to the accurate time information in the pseudo satellite signal message and the calculated delay value, and implements synchronization.
- All indoor base stations perform the above S502 to step S510 to obtain the precise time of the base station, so that all indoor base stations are synchronized in time.
- the pseudo-satellite transmitting device transmits the same navigation message signal as the space-based navigation satellite, and the indoor base station receives the pseudo-satellite signal and obtains the accurate system time, thereby achieving communication.
- the synchronization requirements of the system and the synchronization accuracy between the base stations can be improved.
- modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or separate them into individual integrated circuit modules, or Multiple of these modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
- an indoor base station synchronization method, apparatus, and system provided by an embodiment of the present invention have the following beneficial effects: an indoor base station receives a synchronization signal from a pseudolite transmitting device disposed on the ground, and performs synchronization according to the synchronization signal, due to the pseudo
- the satellite transmitting device is arranged on the ground, and is close to the indoor base station, and the free space loss is small, so that the indoor base station receives the synchronization signal strength, so that the indoor base station can reach the synchronization requirement of the communication system, and can improve the indoor base station. Synchronization accuracy.
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Abstract
本发明公开了一种室内基站同步方法、装置及系统。其中，该方法包括：室内基站接收设置的地面的伪卫星发射装置发送的同步信号；室内基站根据接收到的同步信号获取精确时间；室内基站根据获取到的精确时间进行时间同步。
Description
本发明涉及通信领域，具体而言，涉及一种室内基站同步方法、装置及系统。
超密集组网是第五代(5G)移动通信的关键技术之一，在写字楼、超级市场、火车站、体育馆及密集住宅区等室内人流密集场景进行大量微小区基站的部署，提高覆盖及增加数据业务传输速率，以适应未来5G移动通信的1000倍数据业务量需求，在室内大量部署小型化基站成为未来移动通信发展的一个重要方向。
在室内部署基站时，普通的天基导航卫星信号，如全球定位系统(GPS)、北斗和伽利略卫星，由于距离远，卫星信号自由空间损耗大，到达地面时的信号强度一般只有-150dBm，基站的卫星接收机灵敏度是-160dBm，因此基站设备可以在室外使用卫星同步方式来满足通信系统同步要求。但信号要到达室内，至少要增加20dBm的穿透损耗，则室内基站的卫星接收机无法接收到导航卫星信号，从而达不到通信系统的同步要求。另外有线网络同步(如IEEE 1588)方式受到家庭及室内固定网络条件限制，也往往难以达到基站间同步精度要求。
针对相关技术中室内基站达不到通信系统的同步要求的问题，目前尚未提出有效的解决方案。
发明内容
本发明实施例提供了一种室内基站同步方法、装置及系统，以至少解决相关技术中室内基站达不到通信系统的同步要求的问题。
根据本发明的一个实施例，提供了一种室内基站同步方法，包括：室内基站接收设置的地面的伪卫星发射装置发送的同步信号；所述室内基站根据接收到的所述同步信号获取精确时间；所述室内基站根据获取到的精确时间进行时间同步。
所述室内基站根据接收到的所述同步信号获取精确时间，包括：在所述同步信号存在多径到达的情况下，所述室内基站从多径到达的同步信号中分离出首径到达的同步信号；所述室内基站根据所述首径到达的同步信号到达时刻得到所述伪卫星基站的
时延值；所述室内基站根据所述同步信号中的精确时间信息和计算得到的时延值，计算得到所述精确时间。
室内基站接收设置的地面的伪卫星发射装置发送的同步信号，包括：所述室内基站使用所述室内基站的全球定位系统GPS接收机接收所述同步信号；或者，所述室内基站使用所述室内基站的预设接收机接收所述同步信号，其中，所述预设接收机只设置为接收伪卫星发射装置发送的同步信号。
所述同步信号的发射频率与天基导航卫星信号的发射频率相同。
根据本发明的另一个实施例，提供了一种室内基站同步装置，包括：接收模块，设置为接收设置的地面的伪卫星发射装置发送的同步信号；获取模块，设置为根据接收到的所述同步信号获取精确时间；同步模块，设置为根据获取到的精确时间进行室内基站的时间同步。
所述获取模块包括：分离单元，设置为在所述同步信号存在多径到达的情况下，从多径到达的同步信号中分离出首径到达的同步信号；获取单元，设置为根据所述首径到达的同步信号到达时刻获取所述伪卫星基站的时延值；计算单元，设置为根据所述同步信号中的精确时间信息和计算得到的时延值，计算得到所述精确时间。
所述接收模块通过以下方式接收所述同步信号：使用所述室内基站的全球定位系统GPS接收机接收所述同步信号；或者，使用所述室内基站的预设接收机接收所述同步信号，其中，所述预设接收机只设置为接收伪卫星发射装置发送的同步信号。
根据本发明的又一个实施例，提供了一种室内基站同步系统，包括：伪卫星发射装置和一个或多个室内基站；其中，所述伪卫星发射装置设置在地面上，设置为发射同步信号；所述室内基站包括上述的室内基站同步装置，设置为接收所述同步信号，并根据所述同步信号进行同步。
所述伪卫星发射装置的发射频率与天基导航卫星的发射频率相同。
所述伪卫星发射装置的发射频率1.56GHz。
所述伪卫星发射装置与所述室内基站的最大距离为500米。
通过本发明实施例，室内基站从设置在地面的伪卫星发射装置接收同步信号，根据该同步信号进行同步，由于伪卫星发射装置布置在地面，离室内基站距离较近，自
由空间损耗小，从而使得室内基站接收到同步信号强度较大，进而使得室内基站能够达到通信系统的同步要求，并能提高室内基站间的同步精度。
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是根据本发明实施例的室内基站同步系统的结构示意图；
图2是根据本发明实施例的伪卫星发射装置的布置示意图；
图3是根据本发明实施例的室内基站同步装置的结构示意图；
图4是根据本发明实施例的室内基站同步方法的流程图；
图5是根据本发明可选实施例的室内基站同步方法的流程图。
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
针对相关技术中，室内基站根据天基导航卫星信号进行同步而导致室内基站不能达到通信系统的同步要求的问题，本发明实施例采用伪卫星发射装置替代天基导航卫星发送同步信号。在本发明实施例中，伪卫星发射装置是布置在地面上发射某种定位及同步信号的发射器，例如，发射类似于GPS信号的导航电文，接收机可以使用和GPS信号同步相同的方法来接收伪卫星信号，并进行同步。本发明实施例中，由于伪卫星布置在地面，离用户接收机距离较近，自由空间损耗小，伪卫星信号就可以穿透室内，为室内基站接收。
根据本发明实施例，提供了一种室内基站同步系统。
图1为根据本发明实施例的室内基站同步系统的结构示意图。如图1所示，该系统主要包括：伪卫星发射装置2和一个或多个室内基站4；其中，所述伪卫星发射装置2设置在地面上，设置为发射同步信号；所述室内基站4设置为接收所述同步信号，并根据所述同步信号进行同步。
在本发明实施例中，伪卫星发射装置2也可以为多个。
可选地，室内基站4可以包括图3所示的室内基站同步装置，具体将在下面进行描述。
可选地，所述伪卫星发射装置的发射频率(即工作频率)与天基导航卫星的发射频率相同。例如，所述伪卫星发射装置的发射频率可以为GPS的发射频率，即1.56GHz。
可选地，在本发明实施例中，所述伪卫星发射装置与所述室内基站的最大距离为500米。
图2为本发明实施例中，伪卫星发射装置的布置图，如图2所示，伪卫星发射装置可以布置在室内基站位于的建筑大楼的周围，从而可以使室内基站能够接收到同步信号。
例如，设定伪卫星发射装置与室内基站的最大距离是500米，伪卫星发射装置使用和GPS相同的工作频点1.56GHz，则伪卫星发射装置到室内基站的自由空间损耗为：
L自＝32.45+20logf+20logd＝32.45+20log(1560)+20log(0.5)＝80.31dB
伪卫星信号在室内的穿透损耗和室内建筑物的结构关系很大，一般统计室内承重墙的穿透损耗是20dB，木板隔墙的穿透损耗是5dB，假设伪卫星信号经过2个承重墙和5个木板隔墙后到达室内基站，则室内穿透损耗是：
L穿＝20×2+5×5＝65dB
由于伪卫星发射装置布置在人员密集区，因此发射功率不能太高，以500mw的发射功率，即27dBm为例，则室内基站接收到的伪卫星信号强度是：
R＝27dBm–65dB–80.31dB＝–118.31dBm
满足-160dBm的卫星信号接收灵敏度要求，因此伪卫星以500mw的发射功率，是可以覆盖室内环境的。
通过本发明实施例提供的室内基站同步系统，由伪卫星发射装置发射与天基导航卫星相同的导航电文信号，室内基站接收伪卫星信号并获得精确系统时间，从而实现基站间的同步。
根据本发明实施例，还提供了一种室内基站同步装置，该装置可以位于上述室内基站4中，也可以不设置在室内基站4中，而是设置在室内基站4旁边，能够与所述室内基站进行通讯。
图3为根据本发明实施例的室内基站同步装置的结构示意图，如图3所示，该装置主要包括：接收模块32，设置为接收设置的地面的伪卫星发射装置发送的同步信号；获取模块34，设置为根据接收到的所述同步信号获取精确时间；同步模块36，设置为根据获取到的精确时间进行所述室内基站的时间同步。
可选地，所述获取模块34可以包括：分离单元，设置为在所述同步信号存在多径到达的情况下，从多径到达的同步信号中分离出首径到达的同步信号；获取单元，设置为根据所述首径到达的同步信号到达时刻获取所述伪卫星基站的时延值；计算单元，设置为根据所述同步信号中的精确时间信息和计算得到的时延值，计算得到所述精确时间。
可选地，所述接收模块32通过以下方式接收所述同步信号：使用所述室内基站的全球定位系统GPS接收机接收所述同步信号；或者，使用所述室内基站的预设接收机接收所述同步信号，其中，所述预设接收机只设置为接收伪卫星发射装置发送的同步信号。
根据本发明实施例，还提供了一种室内基站同步方法。
图4为根据本发明实施例的室内基站同步方法的流程图，如图4所示，主要包括以下步骤S402-步骤S406。
步骤S402，室内基站接收设置的地面的伪卫星发射装置发送的同步信号。
可选地，所述同步信号的发射频率与天基导航卫星信号(例如，GPS信号)的发射频率相同。
可选地，室内基站可以使用室内基站的全球定位系统(GPS)接收机接收所述同步信号；或者，所述室内基站也可以使用所述室内基站的预设接收机接收所述同步信号，其中，所述预设接收机只设置为接收伪卫星发射装置发送的同步信号。
步骤S404，所述室内基站根据接收到的所述同步信号获取精确时间。
可选地，在所述同步信号存在多径到达的情况下，则在执行步骤S404时，所述室内基站先从多径到达的同步信号中分离出首径到达的同步信号，然后根据所述首径到
达的同步信号到达时刻得到所述伪卫星基站的时延值，再根据所述同步信号中的精确时间信息和计算得到的时延值，计算得到所述精确时间。
步骤S406，所述室内基站根据获取到的精确时间进行时间同步。
通过本发明实施例提供的上述方法，室内基站通过室外布置伪卫星发射装置发射同步信号进行同步，从而可以满足通信系统的同步要求，并提高基站间同步精度。
图5为本发明实施例的一个可选实施方式中的室内基站同步方法的流程图，如图5所示，主要包括以下步骤S502-步骤S510。
步骤S502，室外伪卫星向室内发射同步信号，信号格式与GPS卫星信号相同，工作频点可以与GPS卫星相同，也可以使用单独的工作频点。
步骤S504，室内基站使用GPS接收机接收伪卫星信号，或使用独立的伪卫星接收机接收，接收实现算法与GPS相同。
步骤S506，由于伪卫星信号在室内传播，存在多径达到，因此，室内基站接收机从多径到达信号中分离出首径到达信号。
步骤S508，室内基站根据首径信号到达时刻计算得到伪卫星与室内基站的时延值。
步骤S510，室内基站根据伪卫星信号消息中的精确时间信息和计算得到的时延值，计算得到本基站获得的精确时间，实现同步。
所有室内基站都执行上述S502至步骤S510获得本基站的精确时间，从而使得所有室内基站在时间上同步。
从以上的描述中，可以看出，在本发明实施例中，由伪卫星发射装置发射与天基导航卫星相同的导航电文信号，室内基站接收伪卫星信号并获得精确系统时间，从而达到了通信系统的同步要求，并且能够提高基站间的同步精度。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将
它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
如上所述，本发明实施例提供的一种室内基站同步方法、装置及系统，具有以下有益效果：室内基站从设置在地面的伪卫星发射装置接收同步信号，根据该同步信号进行同步，由于伪卫星发射装置布置在地面，离室内基站距离较近，自由空间损耗小，从而使得室内基站接收到同步信号强度较大，进而使得室内基站能够达到通信系统的同步要求，并能提高室内基站间的同步精度。
Claims (11)
- 一种室内基站同步方法，包括：室内基站接收设置的地面的伪卫星发射装置发送的同步信号；所述室内基站根据接收到的所述同步信号获取精确时间；所述室内基站根据获取到的精确时间进行时间同步。
- 根据权利要求1所述的方法，其中，所述室内基站根据接收到的所述同步信号获取精确时间，包括：在所述同步信号存在多径到达的情况下，所述室内基站从多径到达的同步信号中分离出首径到达的同步信号；所述室内基站根据所述首径到达的同步信号到达时刻得到所述伪卫星基站的时延值；所述室内基站根据所述同步信号中的精确时间信息和计算得到的时延值，计算得到所述精确时间。
- 根据权利要求1所述的方法，其中，室内基站接收设置的地面的伪卫星发射装置发送的同步信号，包括：所述室内基站使用所述室内基站的全球定位系统GPS接收机接收所述同步信号；或者，所述室内基站使用所述室内基站的预设接收机接收所述同步信号，其中，所述预设接收机只设置为接收伪卫星发射装置发送的同步信号。
- 根据权利要求1至3中任一项所述的方法，其中，所述同步信号的发射频率与天基导航卫星信号的发射频率相同。
- 一种室内基站同步装置，包括：接收模块，设置为接收设置的地面的伪卫星发射装置发送的同步信号；获取模块，设置为根据接收到的所述同步信号获取精确时间；同步模块，设置为根据获取到的精确时间进行室内基站的时间同步。
- 根据权利要求5所述的装置，其中，所述获取模块包括：分离单元，设置为在所述同步信号存在多径到达的情况下，从多径到达的同步信号中分离出首径到达的同步信号；获取单元，设置为根据所述首径到达的同步信号到达时刻获取所述伪卫星基站的时延值；计算单元，设置为根据所述同步信号中的精确时间信息和计算得到的时延值，计算得到所述精确时间。
- 根据权利要求5或6所述的装置，其中，所述接收模块通过以下方式接收所述同步信号：使用所述室内基站的全球定位系统GPS接收机接收所述同步信号；或者，使用所述室内基站的预设接收机接收所述同步信号，其中，所述预设接收机只设置为接收伪卫星发射装置发送的同步信号。
- 一种室内基站同步系统，包括：伪卫星发射装置和一个或多个室内基站；其中，所述伪卫星发射装置设置在地面上，设置为发射同步信号；所述室内基站包括权利要求5至7中任一项所述的装置，设置为接收所述同步信号，并根据所述同步信号进行同步。
- 根据权利要求8所述的系统，其中，所述伪卫星发射装置的发射频率与天基导航卫星的发射频率相同。
- 根据权利要求9所述的系统，其中，所述伪卫星发射装置的发射频率1.56GHz。
- 根据权利要求8至10中任一项所述的系统，其中，所述伪卫星发射装置与所述室内基站的最大距离为500米。
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