CN103813436A - Method for synchronizing household base station air interface, apparatus, and household base station - Google Patents
Method for synchronizing household base station air interface, apparatus, and household base station Download PDFInfo
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- CN103813436A CN103813436A CN201210437475.8A CN201210437475A CN103813436A CN 103813436 A CN103813436 A CN 103813436A CN 201210437475 A CN201210437475 A CN 201210437475A CN 103813436 A CN103813436 A CN 103813436A
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Abstract
The embodiment of the invention provides a method for synchronizing a household base station air interface, an apparatus, and a household base station. The method comprises: performing cell search on an air interface environment in order to single out multiple base stations as candidate synchronization source base stations according to the quality of acquired various base station signals; and selecting one from the candidate synchronization source base stations as a current synchronization source base station; reselecting one from the candidate synchronization source base stations as a current synchronization source base station when it is monitored that the signal quality of the current synchronization source base station deteriorates; maintaining synchronization between the household base station and the selected current synchronization source base station. A problem is resolved that a single synchronization source base station is used in a conventional household base station air interface synchronizing process such that the synchronization source has a high probability in out of synchronism and that when the synchronization source is out of synchronism, a new synchronization source base station cannot be automatically switched to such that the normal service of a user terminal is influenced. The invention relates to communication technical field.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method, device and Home eNodeB of Home eNodeB air interface synchronization.
Background technology
Home eNodeB is mainly used in grand Internet and puts supplementary and residential quarters degree of depth covering scene.Home eNodeB is flexible owing to disposing, one of network construction form that has become extensive employing in 3G/4G wireless communication system with low cost.Due to the distributed deployment characteristic of Home eNodeB, how to complete the Time and Frequency Synchronization between a large amount of Home eNodeB, become the key technology of family base station system.Classical Time and Frequency Synchronization technology comprises that global positioning system (GPS, Global Position System) is synchronous, and IEEE1588 is synchronous, and NTP (Network Time Protocol) (NTP, Network Time Protocol) is synchronous, and some types such as air interface synchronization.Wherein air interface synchronization, owing to not needing to revise current network framework, realizes the factors such as convenience and is extensively adopted.
In prior art, the air interface synchronization of Home eNodeB has all adopted and the method for single synchronisation source base station synchronization, namely only has a synchronisation source base station to be used for synchronizeing with Home eNodeB, and does not consider that the swinging of signal of this synchronisation source base station is qualitative.When this synchronisation source base station is due to shade or block while causing signal attenuation, the probability of synchronisation source step-out is higher.Once there is synchronisation source step-out, can directly stop the service to terminal and again search for new synchronisation source, thereby affecting the regular traffic of user terminal.
Summary of the invention
The embodiment of the present invention provides a kind of Home eNodeB air interface synchronization method, device and Home eNodeB, adopt single synchronisation source base station in order to solve in existing Home eNodeB air interface synchronization process, make synchronisation source step-out probability high, the synchronisation source base station that can not automatically switch new in the time there is synchronisation source step-out, thus the problem of user terminal regular traffic affected.
Based on the problems referred to above, the method for a kind of Home eNodeB air interface synchronization that the embodiment of the present invention provides, comprising:
The environment of eating dishes without rice or wine is carried out to Cell searching, select multiple base stations as candidate's synchronisation source base station according to the signal quality of the each base station signal getting, and select one as current synchronisation source base station from described candidate's synchronisation source base station;
In the time monitoring the signal quality generation deterioration of current synchronisation source base station, from described candidate's synchronisation source base station, reselect one as current synchronisation source base station;
Keep synchronizeing with selected current synchronisation source base station.
The device of a kind of Home eNodeB air interface synchronization that the embodiment of the present invention provides, comprising:
Search module, for the environment of eating dishes without rice or wine is carried out to Cell searching, selects multiple base stations as candidate's synchronisation source base station according to the signal quality of the each base station signal getting;
Select module, select one as current synchronisation source base station for the candidate's synchronisation source base station searching out from described search module; And in the time that monitoring module monitors occurs to worsen to the signal quality of current synchronisation source base station, from described candidate's synchronisation source base station, reselect one as current synchronisation source base station;
Monitoring modular, for monitoring the signal quality of current synchronisation source base station;
Synchronization module, for keeping synchronizeing with selected current synchronisation source base station.
The Home eNodeB that the embodiment of the present invention provides, comprises the device of the above-mentioned Home eNodeB air interface synchronization that the embodiment of the present invention provides.
The beneficial effect of the embodiment of the present invention comprises:
The method of a kind of Home eNodeB air interface synchronization that the embodiment of the present invention provides, device and Home eNodeB, by the environment of eating dishes without rice or wine is carried out to Cell searching, and select the candidate synchronisation source base station of multiple base stations as Home eNodeB according to the signal quality of the base station signal getting, from candidate's synchronisation source base station, select again one as current synchronisation source base station, in the time monitoring current synchronisation source base station signal quality generation deterioration, just from candidate's synchronisation source base station, again select a base station, the current synchronisation source base station that signal quality is occurred to worsen replaces, to each current synchronisation source base station, it is synchronous that Home eNodeB all keeps with it.Like this by selecting the good multiple candidate's synchronisation sources of signal quality base station as the synchronous candidate base station of Home eNodeB, do not have with only having a synchronisation source base station to synchronize with Home eNodeB in prior art compared with candidate's synchronisation source base station, in the time of current synchronisation source base station signal degradation, can automatically from multiple candidate's synchronisation sources base station, select next synchronisation source base station and make Home eNodeB keep with it synchronous, solve in existing Home eNodeB air interface synchronization process and adopted single synchronisation source base station, make synchronisation source step-out probability high, the synchronisation source base station that can not automatically switch new in the time there is synchronisation source step-out, thereby affect the problem of user terminal regular traffic.
Accompanying drawing explanation
The flow chart of the method for a kind of Home eNodeB air interface synchronization that Fig. 1 provides for the embodiment of the present invention;
The flow chart of the air interface synchronization method as an example of TD-SCDMA communication system example that Fig. 2 provides for the embodiment of the present invention;
The structure chart of the device of a kind of Home eNodeB air interface synchronization that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with Figure of description, the embodiment of method, device and the Home eNodeB of a kind of Home eNodeB air interface synchronization that the embodiment of the present invention is provided describes.
The method of a kind of Home eNodeB air interface synchronization that the embodiment of the present invention provides, as shown in Figure 1, specifically comprises the following steps:
S101, the environment of eating dishes without rice or wine is carried out to Cell searching, select multiple base stations as candidate's synchronisation source base station according to the signal quality of the each base station signal getting;
S102, from above-mentioned candidate's synchronisation source base station, select one as current synchronisation source base station;
S103, when monitor current synchronisation source base station signal quality occur worsen time, from described candidate's synchronisation source base station, reselect one as current synchronisation source base station;
S104, with selected current synchronisation source base station keep synchronize.
Further, in the said method step S101 providing in the embodiment of the present invention, complexity issue, at least two base stations, is considered in multiple base stations, preferably 3-5.
Preferably, in the said method step S102 providing in the embodiment of the present invention, can select the best base station of signal quality in candidate base station as first current synchronisation source base station of selecting, and complete initial synchronisation with this base station.
Preferably, in the said method step S103 providing in the embodiment of the present invention, can irregularly monitor or periodically monitor to determine whether the signal quality of current synchronisation source base station worsens to the signal quality of current synchronisation source base station.
In the situation of periodic monitoring, in the time monitoring current synchronisation source base station signal quality lower than pre-set threshold value and continue the cycle of setting, arbitrary base station the current synchronisation source base station that can select to occur to worsen except signal quality in candidate's synchronisation source base station, to be replaced because signal quality at that time occurs to worsen because do the base station of excessive preamble source base station, and now signal quality may take a turn for the better, therefore also can again be chosen as new current synchronisation source base station, but preferably from not yet do described candidate's synchronisation source base station of excessive preamble source base station, select the best base station of signal quality as new current synchronisation source base station, this new current synchronisation source base station is monitored, in the time that this new current synchronisation source base station signal quality also worsens, select next current synchronisation source base station with same method, by that analogy.
Further, in the said method step S103 providing in the embodiment of the present invention, signal quality worsens, can determine lower than pre-set threshold value by irregularly or periodically monitoring current synchronisation source base station signal quality one or many, preferably, can select according to the receiver sensitivity of the performance index setting of Home eNodeB as pre-set threshold value.
In embodiments of the present invention, if the signal quality of current synchronisation source base station does not worsen in current period, continue to monitor deserving preamble source base station, and constantly adjust the local crystal oscillator of Home eNodeB, to reach and the Time and Frequency Synchronization of the signal of eating dishes without rice or wine of deserving preamble source base station.
Further, in said method step S101, the signal power of each base station signal that first basis gets and the weighted sum of signal to noise ratio, signal power or signal-to-noise ratio metric go out the signal quality of each base station signal; Then sort according to the quality of the signal quality of measuring out, start to select successively multiple base stations of setting quantity from the best base station of signal quality as candidate's synchronisation source base station.But the embodiment of the present invention is not limited in the metric form of above-mentioned base station signal quality.
Further, in the said method providing in the embodiment of the present invention, can also carry out following step: worsen if monitor the signal quality of current synchronisation source base station, and in above-mentioned candidate's synchronisation source base station, do not exist signal quality that the base station of worsening does not occur, the signal quality that is candidate's synchronisation source base station of selecting in above-mentioned steps S101 all worsens, there are not other synchronisation source base stations that can replace, judge synchronisation source step-out; After synchronisation source step-out, Home eNodeB can be temporarily not with any base station synchronization, or re-execute above-mentioned steps S101 to step S104.
Further, in the said method step S101 providing in the embodiment of the present invention, in obtaining base station signal quality, can also obtain the essential information such as frequency and cell id of each base station, utilize frequency and the each candidate's synchronisation source of cell id information unique identification base station.
Further, in the said method step S102 providing in the embodiment of the present invention, from the candidate's synchronisation source base station searching out, select first current synchronisation source base station, and complete initial synchronisation, and in step S103, in the time that current synchronisation source base station signal quality occurs to worsen, from candidate's synchronisation source base station, reselect one as current synchronisation source base station, and keep with it synchronous, due to the whole network synchronizing characteristics of synchronous communication system, do not need each all with first current synchronisation source base station outside follow-up current synchronisation source base station re-start initial synchronisation, only need to convert the base-band informations such as scrambler, constantly adjust local crystal oscillator, keep and the eat dishes without rice or wine Time and Frequency Synchronization of signal of follow-up current synchronisation source base station.Therefore can not affect the regular traffic of user terminal.
Further, the method of a kind of Home eNodeB air interface synchronization that the embodiment of the present invention provides can be used in any synchronous communication system, for example: TD SDMA access technology (TD-SCDMA, TimeDivision-Synchronous Code Division Multiple Access), TD-SCDMA Long Term Evolution (TD-LTE, TD-SCDMA Long Term Evolution), worldwide interoperability for microwave access technology (WiMAX, Worldwide Interoperability for Microwave Access) etc.
For the method for above-mentioned a kind of Home eNodeB air interface synchronization that the embodiment of the present invention provides is described better, describe as an example of TD-SCDMA communication system example below, as shown in Figure 2:
After S201, Home eNodeB power on, carry out one by one Cell searching according to candidate's frequency collection, obtain cell id and the corresponding signal power (this sentences the tolerance of signal power as cell signal quality) of all candidate cells;
S202, according to the signal power obtaining in S201, all candidate cells are sorted, and choose the best N of signal quality wherein, signal power is descending be arranged in the list of candidate's synchronisation source c1, c2 ... cN};
S203, choose the best synchronisation source base station c1 of signal quality as current synchronisation source base station, and complete with it initial synchronisation by cell search process, it should be noted that the whole network synchronizing characteristics due to synchro system, all candidate's synchronisation sources base station is all Time and Frequency Synchronization eating dishes without rice or wine;
S204, the sensitivity threshold value that receiver is set are Th=-108dBm;
S205, in the regular traffic of Home eNodeB, periodically monitor the signal quality of current synchronisation source base station;
S206, judge that whether the signal quality of current synchronisation source base station worsens, and if not, performs step S207; If signal quality worsens, the signal quality that continuous N time monitors current synchronisation source base station, lower than sensitivity threshold value, performs step S208; M for example can get 5;
S207, constantly adjust local crystal oscillator, to keep and the eat dishes without rice or wine Time and Frequency Synchronization of signal of current synchronisation source base station, then get back to step S205;
S208, judge signal quality occur worsen current synchronisation source base station whether be last base station in the candidate's synchronisation source station list in above-mentioned steps S202, the poorest base station cN of signal quality in candidate's synchronisation source base station of selecting in step S202; If so, perform step S210, if not, perform step S209;
S209, from candidate's synchronisation source station list, choose one and not yet do excessive preamble source base station and the best base station of signal quality, be in the candidate's synchronisation source list in step S202, signal quality is only worse than the base station of the current synchronisation source base station of signal quality generation deterioration, replace the current synchronisation source base station that signal quality is occurred to worsen, (for example become new current synchronisation source base station, in the time that c1 is current synchronisation source base station and signal quality generation deterioration, selecting c2 is that c1 is replaced in current synchronisation source base station), then get back to step S205;
S210, judge synchronisation source step-out.
Based on same inventive concept, the embodiment of the present invention also provides a kind of device and Home eNodeB of Home eNodeB air interface synchronization, because the principle that these devices are dealt with problems with Home eNodeB is similar to the method for aforementioned Home eNodeB air interface synchronization, therefore the enforcement of this device and Home eNodeB can be referring to the enforcement of preceding method, repeats part and repeat no more.
The embodiment of the present invention also provides a kind of device of Home eNodeB air interface synchronization, as shown in Figure 3, comprising:
Search module 301, for the environment of eating dishes without rice or wine is carried out to Cell searching, selects multiple base stations as candidate's synchronisation source base station according to the signal quality of the each base station signal getting;
Select module 302, select one as current synchronisation source base station for the candidate's synchronisation source base station searching out from search module 301; And in the time that monitoring modular 303 monitors the signal quality generation deterioration of current synchronisation source base station, from above-mentioned candidate's synchronisation source base station, reselect one as current synchronisation source base station;
Monitoring modular 303, for monitoring the signal quality of current synchronisation source base station;
Synchronization module 304, for keeping synchronizeing with selected current synchronisation source base station.
Further, in the said apparatus that the embodiment of the present invention provides, select module 302, specifically for selecting the best base station of signal quality as current synchronisation source base station from above-mentioned candidate's synchronisation source base station.
Further, in the said apparatus that the embodiment of the present invention provides, monitoring modular 303, specifically for periodically monitoring the signal quality of current synchronisation source base station; Select module 302, specifically for when monitoring module monitors to current synchronisation source base station signal quality lower than pre-set threshold value and when the cycle that continues to set, from not yet do above-mentioned candidate's synchronisation source base station of excessive preamble source base station, select the best base station of signal quality as current synchronisation source base station.
Further, in the said apparatus that the embodiment of the present invention provides, search module 301, the signal power of each base station signal getting specifically for basis and the weighted sum of signal to noise ratio, signal power or signal-to-noise ratio metric go out the signal quality of each base station signal; Quality according to the signal quality of measuring out sorts, and starts to select successively multiple base stations of setting quantity as candidate's synchronisation source base station from the best base station of signal quality.
Further, in the said apparatus that the embodiment of the present invention provides, can also comprise: step-out judge module 305, if worsen to the signal quality of current synchronisation source base station for monitoring module monitors, and in above-mentioned candidate's synchronisation source base station, do not exist signal quality that the base station of worsening does not occur, judge synchronisation source step-out.
The embodiment of the present invention provides a kind of Home eNodeB, comprises the above-mentioned Home eNodeB air interface synchronization device that the embodiment of the present invention provides.
The method of a kind of Home eNodeB air interface synchronization that the embodiment of the present invention provides, device and Home eNodeB, by the environment of eating dishes without rice or wine is carried out to Cell searching, and select the candidate synchronisation source base station of multiple base stations as Home eNodeB according to the signal quality of the base station signal getting, from candidate's synchronisation source base station, select again one as current synchronisation source base station, in the time monitoring current synchronisation source base station signal quality generation deterioration, just from candidate's synchronisation source base station, select a base station, the current synchronisation source base station that signal quality is occurred to worsen replaces, to each current synchronisation source base station, it is synchronous that Home eNodeB all keeps with it.Like this by selecting the good multiple candidate's synchronisation sources of signal quality base station as the synchronous candidate base station of Home eNodeB, do not have with only having a synchronisation source base station to synchronize with Home eNodeB in prior art compared with candidate's synchronisation source base station, in the time of current synchronisation source base station signal degradation, can automatically from multiple candidate's synchronisation sources base station, select next synchronisation source base station and make Home eNodeB keep with it synchronous, solve in existing Home eNodeB air interface synchronization process and adopted single synchronisation source base station, make synchronisation source step-out probability high, the synchronisation source base station that can not automatically switch new in the time there is synchronisation source step-out, thereby affect the problem of user terminal regular traffic.
Through the above description of the embodiments, those skilled in the art can be well understood to the embodiment of the present invention and can realize by hardware, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, the technical scheme of the embodiment of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise that some instructions are in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can be distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.The module of above-described embodiment can be merged into a module, also can further split into multiple submodules.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
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| CN106170134A (en) * | 2016-08-15 | 2016-11-30 | 南京熊猫电子股份有限公司 | Arrange net multi-hop of eating dishes without rice or wine of a kind of LTE smallcell indoor synchronizes self-configuring self-organization method |
| CN106304162A (en) * | 2016-08-04 | 2017-01-04 | 福建三元达网络技术有限公司 | The method and system of seamless switching synchronisation source |
| CN106559152A (en) * | 2015-09-28 | 2017-04-05 | 联芯科技有限公司 | The communication dynamic switching method of frequency, self-organizing network nodes and no-manned machine distant control system |
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| CN109618405A (en) * | 2019-01-29 | 2019-04-12 | 南京邮电大学 | A distributed network synchronization method for small cells based on gossip algorithm |
| CN114126033A (en) * | 2021-11-16 | 2022-03-01 | 中信科移动通信技术股份有限公司 | Air interface synchronization method and system for indoor branch base station |
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| CN114126033A (en) * | 2021-11-16 | 2022-03-01 | 中信科移动通信技术股份有限公司 | Air interface synchronization method and system for indoor branch base station |
| WO2023087738A1 (en) * | 2021-11-16 | 2023-05-25 | 中信科移动通信技术股份有限公司 | Air interface synchronization method and system for indoor distribution base station |
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Application publication date: 20140521 |