CN102186236A - Method and device for timing synchronization among micro-cellular base stations - Google Patents
Method and device for timing synchronization among micro-cellular base stations Download PDFInfo
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Abstract
本发明公开了一种微蜂窝基站间定时同步方法，包括步骤：在非同步基站晶振的最大允许调整时间内，若没有UE接入，并且非同步基站只发送广播消息，则停止发送非同步基站的一个子帧的下行公共广播消息；检测该子帧，若检测到没有下行公共广播时隙数据的子帧，则把该子帧的下行公共广播时隙切换为上行时隙，并把对应的频点切换为同步基站的频点，以接收同步基站的下行公共广播时隙数据；根据接收到的下行公共广播时隙数据，进行信道估计得到定时偏移值和载干比；根据定时偏移值和载干比调整非同步基站的晶振，实现定时同步。还公开了一种微蜂窝基站间定时同步装置，在不影响正常业务的情况下，实现基站间的定时同步。
The invention discloses a timing synchronization method between micro-cellular base stations, which comprises the steps of: within the maximum allowable adjustment time of the crystal oscillator of the non-synchronous base station, if there is no UE access and the non-synchronous base station only sends broadcast messages, stop sending the non-synchronous base station A downlink public broadcast message of a subframe; detect the subframe, if a subframe without downlink public broadcast time slot data is detected, switch the downlink public broadcast time slot of the subframe to an uplink time slot, and set the corresponding The frequency point is switched to the frequency point of the synchronous base station to receive the downlink public broadcast time slot data of the synchronous base station; according to the received downlink public broadcast time slot data, channel estimation is performed to obtain the timing offset value and carrier-to-interference ratio; according to the timing offset Value and carrier-to-interference ratio to adjust the crystal oscillator of the non-synchronized base station to achieve timing synchronization. Also disclosed is a timing synchronization device between microcell base stations, which realizes timing synchronization between base stations without affecting normal business.
Description
Technical field
The present invention relates to moving communicating field, be specifically related to time synchronization method and device between a kind of microcell base station.
Background technology
Honeycomb type base station (Femtocel) is to utilize the microcellulor technology to realize the mobile communication system that the microcellulor sub-district covers, and it can reach is the purpose that the high density telephone traffic is provided in the microcellulor sub-district among a small circle.The honeycomb type base station comprises TDD (Time Division Duplexing, time division duplex) class base station, works based on the time-division in the base station of TDD type, so the TDD type of base station is for higher requirement is regularly arranged.
Existing base station regularly simultaneous techniques mainly contains GPS simultaneous techniques, 1588 protocol synchronization technology and intercepts technology.For the GPS simultaneous techniques: the base station receives the timing information of GPS, according to this information modification itself regularly, realizes synchronous.This requirement has GPS receiver module and use occasion can receive GPS information.
For 1588 protocol synchronization technology: the base station is extracted clock information and is adjusted the timing of itself by supporting the network of 1588 agreements.This requires network support 1588 agreements.
For the existing technology of intercepting: its main method is when base station initiated, and the synchronizing signal of adjacent base station is searched for, and makes regularly and adjacent base station synchronization.This method requires microcell base station to stop to send descending synchronous signal channel, and this will have influence on UE (User Equipment, subscriber terminal equipment) and insert, and searching algorithm needs independently hardware resource simultaneously, will increase system cost.
For microcell base station, adopt existing regularly simultaneous techniques can be subjected to the constraint of various conditions: simultaneous techniques complexity, cost have influence on regular traffic and use than higher.
Summary of the invention
The invention provides time synchronization method and device between a kind of microcell base station, under the situation that does not influence the microcell base station regular traffic, reduce the regularly synchronous cost and the complexity of simultaneous techniques, realize that the timing between microcell base station is synchronous.
Time synchronization method between a kind of microcell base station comprises step:
(1) maximum at asynchronous base station crystal oscillator allowed in the adjustment time, the UE that inquires about described asynchronous base station inserts situation and service conditions, if there is not UE to insert, and described asynchronous base station only sends broadcast, then stops to send the descending public broadcasting message of a subframe of described asynchronous base station;
(2) subframe being carried out in described asynchronous base station detects, if detect the subframe that does not have descending public broadcasting time slot data, then the descending public broadcasting time slot of described subframe is switched to ascending time slot, and the frequency of described descending public broadcasting time slot switched to the frequency of synchronising base station, to receive the descending public broadcasting time slot data of described synchronising base station;
(3), carry out the carrier/interface ratio that channel estimating obtains the timing slip value and the descending common broadcast channel of this synchronising base station that receives according to the descending public broadcasting time slot data of this synchronising base station that receives;
(4) adjust the crystal oscillator of described asynchronous base station according to described timing slip value and described carrier/interface ratio, realize regularly synchronously.
Preferably, said method can also comprise step: in described asynchronous base station the carrier/interface ratio pre-value is set, less than described carrier/interface ratio pre-value, timing adjustment is not carried out in then described asynchronous base station as if described carrier/interface ratio; If described carrier/interface ratio more than or equal to described carrier/interface ratio pre-value, is then carried out the operation of described step (4).
Also disclose timing synchronization device between a kind of microcell base station, having comprised:
Enquiry module is used for allowing in the adjustment time in the maximum of asynchronous base station crystal oscillator, and the UE that inquires about described asynchronous base station inserts situation and service conditions; If there is not UE to insert, and described asynchronous base station only sends broadcast, then stops to send the descending public broadcasting message of a subframe of described asynchronous base station;
Detection module is used for that subframe is carried out in described asynchronous base station and detects;
The time slot handover module, be used for testing result according to described detection module, if detect the subframe that does not have descending public broadcasting time slot data, then the descending public broadcasting time slot of described subframe is switched to ascending time slot, and the frequency of described descending public broadcasting time slot switched to the frequency of synchronising base station, to receive the descending public broadcasting time slot data of described synchronising base station;
Channel estimation module is used for the descending public broadcasting time slot data of this synchronising base station of receiving according to described time slot handover module, carries out that channel estimating obtains the timing slip value and the carrier/interface ratio of the descending common broadcast channel of this synchronising base station of receiving;
Synchronous adjusting module is used for adjusting according to described timing slip value and described carrier/interface ratio the crystal oscillator of described asynchronous base station, realizes regularly synchronously.
Above-mentioned timing device can also comprise:
Comparison module is used to be provided with the carrier/interface ratio pre-value, if described carrier/interface ratio, is not then carried out timing adjustment less than described carrier/interface ratio pre-value; If it is synchronous that described carrier/interface ratio more than or equal to described carrier/interface ratio pre-value, then notifies described synchronous adjusting module to carry out timing.
The present invention allows in the adjustment time by the maximum at asynchronous base station crystal oscillator, constantly inquire about this asynchronous service in base station situation, if there is not regular traffic to insert, then stop to send the descending public broadcasting message of a subframe of this asynchronous base station, then the descending public broadcasting time slot of this subframe is switched to ascending time slot, the frequency of this descending public broadcasting time slot is switched to the frequency of synchronising base station, be used for receiving the descending public broadcasting time slot data of synchronising base station; The data that receive are carried out channel estimating obtain timing slip value and carrier/interface ratio, carry out timing synchronously according to this timing slip value and carrier/interface ratio.Under the situation that does not influence the microcell base station regular traffic, reduce the regularly synchronous cost and the complexity of simultaneous techniques, realize that the timing between microcell base station is synchronous.
Description of drawings
Fig. 1 is a flow chart of the inventive method;
Fig. 2 is a schematic diagram of apparatus of the present invention;
Fig. 3 is another schematic diagram of apparatus of the present invention.
Embodiment
The present invention mainly is the base station at the TDD type, because worked based on the time-division in the base station of TDD type, so the TDD type of base station is had relatively high expectations for timing, introduces the present invention below in conjunction with accompanying drawing.
With reference to figure 1, time synchronization method between a kind of microcell base station comprises step:
101, in the certain hour,, in a subframe, stop to send descending public broadcasting time slot data according to the service conditions of microcell base station;
Maximum at asynchronous base station crystal oscillator allowed in the adjustment time, the UE that inquires about asynchronous base station inserts situation and service conditions, if there is not UE to insert, and asynchronous base station only sends broadcast, then stops to send the descending public broadcasting message of a subframe of asynchronous base station.
102, the descending public broadcasting time slot of this subframe is switched to up link, its frequency switches to the synchronising base station frequency;
Subframe is carried out in asynchronous base station to be detected, if detect the subframe that does not have descending public broadcasting time slot data, then the descending public broadcasting time slot of this subframe is switched to ascending time slot, and the frequency of descending public broadcasting time slot switched to the frequency of synchronising base station, to receive the descending public broadcasting time slot data of this synchronising base station.
103, the descending common broadcast channel of synchronising base station is carried out channel estimating, obtain deviant and carrier/interface ratio;
According to the descending public broadcasting time slot data of this synchronising base station that receives, carry out the carrier/interface ratio that channel estimating obtains the timing slip value and the descending common broadcast channel of this synchronising base station that receives.
104, adjust asynchronous base station according to deviant and carrier/interface ratio, realize synchronously.
Adjust the crystal oscillator of asynchronous base station according to timing slip value and carrier/interface ratio, realize regularly synchronously.
The present invention allows in the adjustment time by the maximum at asynchronous base station crystal oscillator, constantly inquire about this asynchronous service in base station situation, if there is not regular traffic to insert, then stop to send the descending public broadcasting message of a subframe of this asynchronous base station, then the descending public broadcasting time slot of this subframe is switched to ascending time slot, the frequency of this descending public broadcasting time slot is switched to the frequency of synchronising base station, be used for receiving the descending public broadcasting time slot data of synchronising base station; The data that receive are carried out channel estimating obtain timing slip value and carrier/interface ratio, carry out timing synchronously according to this timing slip value and carrier/interface ratio.Under the situation that does not influence the microcell base station regular traffic, reduce the regularly synchronous cost and the complexity of simultaneous techniques, realize that the timing between microcell base station is synchronous.
In order to improve the reliability of calibration, the carrier/interface ratio pre-value can be set, if the carrier/interface ratio that obtains through channel estimating is more than or equal to the carrier/interface ratio pre-value that is provided with, just carry out the timing adjustment of asynchronous base station, concrete steps can for:
In this asynchronous base station the carrier/interface ratio pre-value is set, less than described carrier/interface ratio pre-value, then timing adjustment is not carried out in this asynchronous base station as if this carrier/interface ratio; If this carrier/interface ratio more than or equal to the carrier/interface ratio pre-value, is then carried out the operation of above-mentioned steps 104.
Introduce device of the present invention below, with reference to figure 2, timing synchronization device between a kind of microcell base station comprises:
Enquiry module S1 is used for allowing in the adjustment time in the maximum of asynchronous base station crystal oscillator, and the UE that inquires about asynchronous base station inserts situation and service conditions; If there is not UE to insert, and this asynchronous base station only sends broadcast, then stops to send the descending public broadcasting message of a subframe of this asynchronous base station;
Detection module S2 is used for that subframe is carried out in this asynchronous base station and detects;
Time slot handover module S3, be used for testing result according to detection module S2, if detect the subframe that does not have descending public broadcasting time slot data, then the descending public broadcasting time slot of subframe is switched to ascending time slot, and the frequency of descending public broadcasting time slot switched to the frequency of synchronising base station, to receive the descending public broadcasting time slot data of synchronising base station;
Channel estimation module S4 is used for the descending public broadcasting time slot data of this synchronising base station of receiving according to time slot handover module S3, carries out that channel estimating obtains the timing slip value and the carrier/interface ratio of the descending common broadcast channel of this synchronising base station of receiving;
Synchronous adjusting module S5 is used for adjusting according to timing slip value and carrier/interface ratio the crystal oscillator of asynchronous base station, realizes regularly synchronously.
The present invention allows in the adjustment time by the maximum at asynchronous base station crystal oscillator, constantly inquire about this asynchronous service in base station situation, if there is not regular traffic to insert, then stop to send the descending public broadcasting message of a subframe of this asynchronous base station, then the descending public broadcasting time slot of this subframe is switched to ascending time slot, the frequency of this descending public broadcasting time slot is switched to the frequency of synchronising base station, be used for receiving the descending public broadcasting time slot data of synchronising base station; The data that receive are carried out channel estimating obtain timing slip value and carrier/interface ratio, carry out timing synchronously according to this timing slip value and carrier/interface ratio.Under the situation that does not influence the microcell base station regular traffic, reduce the regularly synchronous cost and the complexity of simultaneous techniques, realize that the timing between microcell base station is synchronous.
As Fig. 3, in order to improve the reliability of regularly adjusting, said apparatus can also comprise: comparison module S41 is used to be provided with the carrier/interface ratio pre-value, if carrier/interface ratio, is not then carried out timing adjustment less than this carrier/interface ratio pre-value; If it is synchronous that carrier/interface ratio more than or equal to this carrier/interface ratio pre-value, then notifies synchronous adjusting module S5 to carry out timing.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (4)
1. time synchronization method between a microcell base station is characterized in that,
(1) maximum at asynchronous base station crystal oscillator allowed in the adjustment time, the UE that inquires about described asynchronous base station inserts situation and service conditions, if there is not UE to insert, and described asynchronous base station only sends broadcast, then stops to send the descending public broadcasting message of a subframe of described asynchronous base station;
(2) subframe being carried out in described asynchronous base station detects, if detect the subframe that does not have descending public broadcasting time slot data, then the descending public broadcasting time slot of described subframe is switched to ascending time slot, and the frequency of described descending public broadcasting time slot switched to the frequency of synchronising base station, to receive the descending public broadcasting time slot data of described synchronising base station;
(3) carry out channel estimating according to the descending public broadcasting time slot data of the described synchronising base station that receives, obtain the carrier/interface ratio of the timing slip value and the descending common broadcast channel of this synchronising base station that receives;
(4) adjust the crystal oscillator of described asynchronous base station according to described timing slip value and described carrier/interface ratio, realize regularly synchronously.
2. time synchronization method between microcell base station according to claim 1 is characterized in that, comprises step before in described step (4):
In described asynchronous base station the carrier/interface ratio pre-value is set, less than described carrier/interface ratio pre-value, timing adjustment is not carried out in then described asynchronous base station as if described carrier/interface ratio; If described carrier/interface ratio more than or equal to described carrier/interface ratio pre-value, is then carried out the operation of described step (4).
3. timing synchronization device between a microcell base station is characterized in that, comprising:
Enquiry module is used for allowing in the adjustment time in the maximum of asynchronous base station crystal oscillator, and the UE that inquires about described asynchronous base station inserts situation and service conditions; If there is not UE to insert, and described asynchronous base station only sends broadcast, then stops to send the descending public broadcasting message of a subframe of described asynchronous base station;
Detection module is used for that subframe is carried out in described asynchronous base station and detects;
The time slot handover module, be used for testing result according to described detection module, if detect the subframe that does not have descending public broadcasting time slot data, then the descending public broadcasting time slot of described subframe is switched to ascending time slot, and the frequency of described descending public broadcasting time slot switched to the frequency of synchronising base station, to receive the descending public broadcasting time slot data of described synchronising base station;
Channel estimation module is used for the descending public broadcasting time slot data of this synchronising base station of receiving according to described time slot handover module, carries out that channel estimating obtains the timing slip value and the carrier/interface ratio of the descending common broadcast channel of this synchronising base station of receiving;
Synchronous adjusting module is used for adjusting according to described timing slip value and described carrier/interface ratio the crystal oscillator of described asynchronous base station, realizes regularly synchronously.
4. timing synchronization device between microcell base station according to claim 3 is characterized in that, also comprises:
Comparison module is used to be provided with the carrier/interface ratio pre-value, if described carrier/interface ratio, is not then carried out timing adjustment less than described carrier/interface ratio pre-value; If it is synchronous that described carrier/interface ratio more than or equal to described carrier/interface ratio pre-value, then notifies described synchronous adjusting module to carry out timing.
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| CN102802257A (en) * | 2012-08-06 | 2012-11-28 | 京信通信系统（广州）有限公司 | Base station synchronizing method and device and base station system |
| CN103167600A (en) * | 2013-03-29 | 2013-06-19 | 京信通信系统（广州）有限公司 | Method and device for synchronizing base stations |
| CN103379614A (en) * | 2012-04-11 | 2013-10-30 | 中国移动通信集团公司 | A method for synchronizing air interfaces of home base stations and base stations |
| CN104853427A (en) * | 2014-02-17 | 2015-08-19 | 中国移动通信集团公司 | Synchronization method for household base station, and household base station |
| CN111278102A (en) * | 2020-01-16 | 2020-06-12 | 深圳前海中电慧安科技有限公司 | Base station synchronization method, device, server and storage medium |
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| CN103379614A (en) * | 2012-04-11 | 2013-10-30 | 中国移动通信集团公司 | A method for synchronizing air interfaces of home base stations and base stations |
| CN103379614B (en) * | 2012-04-11 | 2016-12-07 | 中国移动通信集团公司 | The air interface synchronization method of Home eNodeB and base station |
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| CN104853427A (en) * | 2014-02-17 | 2015-08-19 | 中国移动通信集团公司 | Synchronization method for household base station, and household base station |
| CN111278102A (en) * | 2020-01-16 | 2020-06-12 | 深圳前海中电慧安科技有限公司 | Base station synchronization method, device, server and storage medium |
| CN111278102B (en) * | 2020-01-16 | 2022-08-09 | 深圳前海中电慧安科技有限公司 | Base station synchronization method, device, server and storage medium |
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