CN103259607A - Clock synchronization method and clock synchronization device - Google Patents
Clock synchronization method and clock synchronization device Download PDFInfo
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- CN103259607A CN103259607A CN2012100394644A CN201210039464A CN103259607A CN 103259607 A CN103259607 A CN 103259607A CN 2012100394644 A CN2012100394644 A CN 2012100394644A CN 201210039464 A CN201210039464 A CN 201210039464A CN 103259607 A CN103259607 A CN 103259607A
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Abstract
The invention discloses a clock synchronization method and a clock synchronization device. The clock synchronization method comprises the following steps; a base band unit (BBU) receives global position system (GPS) information sent by a GPS receiver in a remote radio unit (RRU), and a clock synchronization module in a base station synchronously processes the GPS information received by the BBU. According to the clock synchronization method and the clock synchronization device, a single optical fiber resource and independent power supply electric supplying are not needed, and cost is saved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of clock synchronizing method and device.
Background technology
The base station that time division duplex (Time Division Duplex abbreviates TDD as) wireless network is strict and user's physical channel synchronously, i.e. air interface synchronization.Global positioning system (Global Positioning System abbreviates GPS as) is used as the reference synchronization benchmark at large.To be gps antenna be connected on the receiver in the base station by copper cable traditional application mode, because the decay of copper cable, copper cable length generally can not surpass 100m, otherwise just need install repeater additional; Secondly, the unbending characteristic of copper cable also causes constructional difficulties, in addition, disturbs and the GPS installation requirement has the headroom of 120 degree owing to exist, and therefore, the addressing of antenna and receiver is had certain limitation.So on the basis that traditional GPS uses, develop and to zoom out GPS, this technology is arranged receiver and antenna part, thereby is avoided above shortcoming by fiber optic stretch.But zooming out GPS needs independently far-pulling module, and needs independent fiber resource and power supply power supply, and this is that the enforcement of zooming out GPS causes certain difficulty.
Need independently far-pulling module at zooming out GPS in the correlation technique, also need the problem of independent fiber resource and power supply power supply, do not propose effective solution at present as yet.
Summary of the invention
The invention provides a kind of clock synchronizing method and device, need independently far-pulling module with the GPS that zooms out that solves at least in the correlation technique, also need one of problem of independent fiber resource and power supply power supply.
According to an aspect of the present invention, provide a kind of clock synchronizing method, having comprised: BBU receives the GPS information that sends from the GPS receiver in the RRU; Clock synchronization module in the base station is handled synchronously to the GPS information that BBU receives.
Preferably, the BBU reception comprises from the GPS information that the GPS receiver in the RRU sends: the transmitting-receiving interface module among the RRU receives the GPS information that the GPS receiver sends; Transmitting-receiving interface module among the BBU receives the GPS information that the transmitting-receiving interface module among the RRU sends.
Preferably, the transmitting-receiving interface module among the RRU and the transmitting-receiving interface module among the BBU are carried out transfer of data by optical fiber.
Preferably, clock synchronization module is arranged in BBU.
Preferably, GPS information comprises pulse per second (PPS) 1PPS and real-time time TOD information.
Preferably, after BBU receives the GPS information that sends from the GPS receiver in the RRU, also comprise: BBU carries out the fiber delay time compensation.
Preferably, the GPS information that BBU is received of the clock synchronization module in the base station is handled synchronously and comprised: clock synchronization module is adjusted local clock by GPS information.
According to another aspect of the present invention, provide a kind of clock synchronization apparatus, be positioned at the base station, having comprised: receiver module is used for receiving the GPS information that sends from the GPS receiver in the RRU; Synchronization module is used for the GPS information that receiver module receives is handled synchronously.
Preferably, receiver module comprises: receive submodule, be used for the GPS information of the transmitting-receiving interface module transmission of reception RRU.
Preferably, synchronization module comprises: synchronous submodule is used for adjusting local clock by GPS information.
By the present invention, the GPS receiver is placed RRU, by the Optical Fiber Transmission gps signal between BBU and the RRU, solved and zoomed out independently far-pulling module of GPS, also need the problem of independent fiber resource and power supply power supply, and then provide cost savings.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not constitute improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the clock synchronizing method of the embodiment of the invention;
Fig. 2 is the principle schematic according to the clock synchronizing method of the embodiment of the invention;
Fig. 3 is the schematic diagram that passes through CPRI control word carrying 1PPS and TOD according to the embodiment of the invention;
Fig. 4 is the structured flowchart synchronous according to the clock of the embodiment of the invention;
Fig. 5 is the synchronous structured flowchart one of clock according to the preferred embodiment of the invention;
Fig. 6 is the synchronous structured flowchart two of clock according to the preferred embodiment of the invention.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Embodiment one
The invention provides a kind of clock synchronizing method, Fig. 1 is the flow chart according to the clock synchronizing method of the embodiment of the invention, and as shown in Figure 1, this method comprises that following step S102 is to step S104.
Step S102, Base Band Unit (Base Band Unit abbreviates BBU as) receives the GPS information that sends from the GPS receiver in the Remote Radio Unit (Radio Remote Unit abbreviates RRU as).
Step S104, the clock synchronization module in the base station is handled synchronously to the GPS information that BBU receives.
In the correlation technique, zoom out GPS and need independently far-pulling module, also need the power supply of independent fiber resource and power supply, by the embodiment of the invention, the GPS receiver is placed RRU, get final product the transmit GPS signal by the existing equipment between BBU and the RRU, optical fiber and power supply unit have been comprised in the equipment, solved and zoomed out independently far-pulling module of GPS, also needed the problem of independent fiber resource and power supply power supply, and then provide cost savings.
Preferably, the BBU reception comprises from the GPS information that the GPS receiver in the RRU sends: the transmitting-receiving interface module among the RRU receives the GPS information that the GPS receiver sends; Transmitting-receiving interface module among the BBU receives the GPS information that the transmitting-receiving interface module among the RRU sends.In this preferred embodiment, by transmission information between the transmitting-receiving interface module, stability and promptness that the information that guaranteed is transmitted.
Preferably, the transmitting-receiving interface module among the RRU and the transmitting-receiving interface module among the BBU are carried out transfer of data by optical fiber.
Preferably, clock synchronization module is arranged in BBU.
Preferably, GPS information comprises pulse per second (PPS) 1PPS and real-time time TOD information.
Preferably, after BBU receives the GPS information that sends from the GPS receiver in the RRU, also comprise: BBU carries out the fiber delay time compensation.By this preferred embodiment, guaranteed that information transmitted has synchronised clock in the optical fiber.
Preferably, the GPS information that BBU is received of the clock synchronization module in the base station is handled synchronously and comprised: clock synchronization module is adjusted local clock by GPS information.By this preferred embodiment, realized that the clock of base station is synchronous.
Embodiment two
Fig. 2 is the principle schematic according to the clock synchronizing method of the embodiment of the invention, as shown in Figure 2, the GPS receiver is built among the RRU, gps antenna is connected on the RRU, form synchronization message after the conversion of relevant information through RRU inside of GPS receiver output, this synchronization message and BBU and RRU interface data sharing optical fiber are transferred to BBU, realize that the clock of base station is synchronous.
The described device of present embodiment comprises: GPS receiver module, transmitting-receiving interface module, clock synchronization module.The GPS receiving processing module is positioned at RRU, as a kind of preferred implementation, the time synchronized module can be placed in the BBU, and the two is by the communication of transmitting-receiving interface module.Two ends connect by optical fiber, are responsible for data transmit-receive.
The described method of present embodiment is as follows:
Integrated GPS receiver in the RRU, receiver is exported to the transmitting-receiving interface module with GPS information, and GPS information comprises pulse per second (PPS) (1 pulse per second abbreviates 1PPS as) and real-time time (Time Of Date abbreviates TOD as) information.
The transmitting-receiving interface module is carried to GPS information on common radio-frequency interface (Common Public Radio Interface the abbreviates CPRI as) agreement, and sends to BBU by optical fiber.
After the GPS information that the interface module of the interface module of BBU in receiving RRU sends, its clock synchronization module of transferring to BBU is handled, thereby reached the synchronous purpose of clock.
Compare with correlation technique, the described method and apparatus of present embodiment has adopted the inside that the GPS receiver is placed RRU, by the method for the Optical Fiber Transmission GPS information between BBU and RRU, relies on RRU to realize that GPS zooms out purpose, and present embodiment has the following advantages:
At first, independently zoom out GPS and need independently far-pulling module, present embodiment uses the mode that zooms out GPS and the shared fiber resource of RRU, can be by the purpose that GPS and the integrated GPS of realization of RRU are zoomed out, do not need independent far-pulling module, at simplified apparatus, the cost-effective while, also solved the installation question that independently zooms out GPS.
Secondly, independently zooming out GPS needs independent fiber resource, and present embodiment has overcome this defective, realizes that by existing fiber resource between BBU and RRU GPS zooms out, and saves fiber resource, adapts to the place of fiber resource anxiety.
In addition, independently zooming out GPS needs independent power supply power supply, and present embodiment carries out integrated design with GPS and RRU, does not need independent power supply unit and cable resource, is suitable for the place of condition of power supply difference and shortage of resources.
Embodiment three
Be described in detail below by the implementation procedure of an instantiation to the embodiment of the invention.Method for synchronous all the time according to the embodiment of the invention may further comprise the steps:
Step 4, the BBU side is carried out the optical-fiber time-delay compensation according to the CPRI agreement, and detects up superframe pulse frame frequency output by the transmitting-receiving interface module.
Step 5, the transmitting-receiving interface module of BBU side detects the GPS information of receiving according to the CPRI agreement, and according to superframe and the clocking value at place, with frame pulse relatively, recover the 1PPS pulse and also send to clock synchronization module.
Step 6, clock synchronization module carries out phase demodulation according to GPS information and the local clock received, carries out the local clock adjustment, adjusts the step 1 of returning the step present embodiment after finishing, and is synchronous up to finishing system clock.
Need to prove, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
The embodiment of the invention also provides a kind of clock synchronization apparatus, and this device can be used for realizing above-mentioned clock synchronizing method.This device can be positioned at the base station.Fig. 4 is the structured flowchart according to the clock synchronization apparatus of the embodiment of the invention, and as shown in Figure 4, this device comprises receiver module 42 and synchronization module 44, below its structure is described in detail.
Fig. 5 is the synchronous structured flowchart one of clock according to the preferred embodiment of the invention, and as shown in Figure 5, receiver module 42 comprises: receive submodule 422, be used for receiving the GPS information that the transmitting-receiving interface module of RRU sends.
Fig. 6 is the synchronous structured flowchart two of clock according to the preferred embodiment of the invention, and as shown in Figure 6, synchronization module 44 comprises: submodule 442 synchronously is used for adjusting local clock by GPS information.
Preferably, the transmitting-receiving interface module among the RRU and the transmitting-receiving interface module among the BBU are carried out transfer of data by optical fiber.
Preferably, clock synchronization module is arranged in BBU.
Preferably, GPS information comprises pulse per second (PPS) 1PPS and real-time time constant TOD information.
Preferably, said apparatus also comprises: compensating module is used for carrying out the fiber delay time compensation.
Need to prove that the clock synchronization apparatus of describing among the device embodiment is corresponding to above-mentioned method embodiment, its concrete implementation procedure had been carried out detailed description in method embodiment, do not repeat them here.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. clock synchronizing method is characterized in that comprising:
Base Band Unit BBU receives the GPS information that sends from the global position system GPS receiver in the radio frequency remote unit RRU;
Clock synchronization module in the base station is handled synchronously to the described GPS information that described BBU receives.
2. method according to claim 1 is characterized in that, BBU receives the GPS information that sends from the GPS receiver in the RRU and comprises:
Transmitting-receiving interface module among the described RRU receives the described GPS information that described GPS receiver sends;
Transmitting-receiving interface module among the described BBU receives the described GPS information that the transmitting-receiving interface module among the described RRU sends.
3. method according to claim 2 is characterized in that, the transmitting-receiving interface module among the described RRU and the transmitting-receiving interface module among the described BBU are carried out transfer of data by optical fiber.
4. method according to claim 1 is characterized in that, described clock synchronization module is arranged in described BBU.
5. method according to claim 1 is characterized in that, described GPS information comprises pulse per second (PPS) 1PPS and real-time time TOD information.
6. method according to claim 1 is characterized in that, after BBU receives the GPS information that sends from the GPS receiver in the RRU, also comprises: described BBU carries out the fiber delay time compensation.
7. method according to claim 1 is characterized in that, the described GPS information that the clock synchronization module in the described base station receives described BBU is handled synchronously and comprised: described clock synchronization module is adjusted local clock by described GPS information.
8. a clock synchronization apparatus is positioned at the base station, it is characterized in that comprising:
Receiver module is used for receiving the GPS information that sends from the global position system GPS receiver in the radio frequency remote unit RRU;
Synchronization module is used for the described GPS information that described receiver module receives is handled synchronously.
9. device according to claim 8 is characterized in that, described receiver module comprises: receive submodule, be used for the described GPS information of the transmitting-receiving interface module transmission of the described RRU of reception.
10. device according to claim 8 is characterized in that, described synchronization module comprises: synchronous submodule is used for adjusting local clock by described GPS information.
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| CN2012100394644A CN103259607A (en) | 2012-02-21 | 2012-02-21 | Clock synchronization method and clock synchronization device |
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| CN104158616A (en) * | 2014-07-28 | 2014-11-19 | 京信通信系统（中国）有限公司 | Clock synchronization method and device in optical fiber transmission system |
| KR20150057281A (en) * | 2013-11-19 | 2015-05-28 | 주식회사 쏠리드 | Time synchronization method and system between communication units |
| WO2015154443A1 (en) * | 2014-07-10 | 2015-10-15 | 中兴通讯股份有限公司 | Gps signal acquisition method and distributed base station |
| CN105429690A (en) * | 2014-09-23 | 2016-03-23 | 中兴通讯股份有限公司 | Signal transmission method and system |
| WO2016201619A1 (en) * | 2015-06-16 | 2016-12-22 | 华为技术有限公司 | Signal conversion method, and signal conversion apparatus and system |
| CN106375014A (en) * | 2015-07-22 | 2017-02-01 | 中兴通讯股份有限公司 | BBU-RRU time-delay setting method and apparatus |
| CN108370612A (en) * | 2015-12-09 | 2018-08-03 | 华为技术有限公司 | The method, apparatus and system that clock synchronizes between a kind of Base Band Unit |
| CN108738127A (en) * | 2018-04-13 | 2018-11-02 | 中国科学院微电子研究所 | Radio remote unit, baseband processing unit, distributed base station and synchronization method thereof |
| WO2019170108A1 (en) * | 2018-03-09 | 2019-09-12 | 华为技术有限公司 | Positioning method and device |
| CN111107621A (en) * | 2018-10-29 | 2020-05-05 | 大唐移动通信设备有限公司 | Synchronization method and device |
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| KR20150057281A (en) * | 2013-11-19 | 2015-05-28 | 주식회사 쏠리드 | Time synchronization method and system between communication units |
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| KR101943571B1 (en) * | 2014-07-10 | 2019-01-29 | 지티이 코포레이션 | GPS Signal Acquisition Method and Distributed Base Station |
| EP3169087A4 (en) * | 2014-07-10 | 2017-07-12 | ZTE Corporation | Gps signal acquisition method and distributed base station |
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| CN106471762B (en) * | 2015-06-16 | 2018-12-07 | 华为技术有限公司 | A kind of signal conversion method, chromacoder and system |
| CN106375014A (en) * | 2015-07-22 | 2017-02-01 | 中兴通讯股份有限公司 | BBU-RRU time-delay setting method and apparatus |
| CN108370612A (en) * | 2015-12-09 | 2018-08-03 | 华为技术有限公司 | The method, apparatus and system that clock synchronizes between a kind of Base Band Unit |
| CN108370612B (en) * | 2015-12-09 | 2020-11-06 | 华为技术有限公司 | Method, device and system for clock synchronization between baseband units |
| WO2019170108A1 (en) * | 2018-03-09 | 2019-09-12 | 华为技术有限公司 | Positioning method and device |
| CN110248378A (en) * | 2018-03-09 | 2019-09-17 | 华为技术有限公司 | A kind of localization method and device |
| US11412474B2 (en) | 2018-03-09 | 2022-08-09 | Huawei Technologies Co., Ltd. | Positioning method and apparatus |
| CN108738127A (en) * | 2018-04-13 | 2018-11-02 | 中国科学院微电子研究所 | Radio remote unit, baseband processing unit, distributed base station and synchronization method thereof |
| CN108738127B (en) * | 2018-04-13 | 2021-04-27 | 中国科学院微电子研究所 | Radio remote unit, baseband processing unit, distributed base station and synchronization method thereof |
| CN111107621A (en) * | 2018-10-29 | 2020-05-05 | 大唐移动通信设备有限公司 | Synchronization method and device |
| CN114220255A (en) * | 2021-12-29 | 2022-03-22 | 宜昌测试技术研究所 | Distributed acoustic equipment synchronous control system and method |
| CN114220255B (en) * | 2021-12-29 | 2024-05-10 | 宜昌测试技术研究所 | Distributed acoustic equipment synchronous control system and method |
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