CN101136688A - TD-SCDMA system extension unit synchronization method and device - Google Patents
TD-SCDMA system extension unit synchronization method and device Download PDFInfo
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- CN101136688A CN101136688A CNA200610112758XA CN200610112758A CN101136688A CN 101136688 A CN101136688 A CN 101136688A CN A200610112758X A CNA200610112758X A CN A200610112758XA CN 200610112758 A CN200610112758 A CN 200610112758A CN 101136688 A CN101136688 A CN 101136688A
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Abstract
This invention provides a method for synchronizing zoom-out units of the TD-SCDMA system including: a base station gets a synchronous signal necessary for synchronization from a synchronous signal source and transmits it to zoom-out units via transmission links, which get the signal and delay the set timed deviation then to switch the empty, besides, a synchronizing device is provided including: a synchronous signal source unit of a base station, a master control unit, a digital interface unit, a zoom-out digital interface unit and zoom-out units realizing synchronization between a base station and zoom-out units and synchronization among themselves and real time calibration to the synchronization.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of TD-SCDMA system extension unit synchronization method and device.
Background technology
Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time-Division Synchronization CodeDivision-Multiple-Access) system is a synchro system, needs a plurality of base stations to realize synchronously.Traditional TD-SCDMA system mainly be adopt global positioning system (GPS, Global Positioning System) antenna realize between the base station synchronously; For the extension unit of TD-SCDMA system, generally speaking, extension unit is connected with the base station by optical fiber.
Usually the distance of extension unit and base station is far away, and extension unit can't directly obtain the GPS synchronizing signal from the base station.A kind of possible method is all to install the GPS receiving element to each extension unit, thus realize between the base station synchronously.Yet,, use this scheme can bring a series of problems such as design, installation, cost because extension unit is an outdoor equipment.Therefore, this scheme is very impracticable.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of TD-SCDMA system extension unit synchronization method and device, can realize between base station and extension unit and the extension unit synchronously, and can be to carrying out real time calibration synchronously.
The technical scheme that realizes the object of the invention is as follows:
A kind of TD-SCDMA system extension unit synchronization method, base station side obtains the synchronizing signal that system synchronization needs by source of synchronising signal, is sent to extension unit in real time by transmission link; Extension unit gets access to synchronizing signal, postpones the switch work of the laggard line space mouth of timing offset of setting.
Preferably, set the timing offset of each extension unit according to following steps:
, calculate respectively as benchmark with distance base station extension unit farthest, and each extension unit is given in configuration according to the time delay measures of each extension unit and baseband processing unit.
Preferably, according to following steps synchronizing signal is carried out initial configuration:
A, base station side periodically detect the initial configuration that whether needs extension unit is carried out synchronizing signal, then continue step B if desired, otherwise wait until that next sense cycle continues to detect;
B, detecting the digital interface that constantly initial value of synchronizing signal is set to base station side, the base station side digital interface adds the digital interface that sends to extension unit after 1 in moment of a subframe duration subsequently with initial value, and the digital interface of extension unit is upgraded the synchronizing signal value constantly at next subframe duration.
Preferably, further comprise: base station side is periodically carried out real time calibration to the synchronizing signal of extension unit.
Preferably, carry out the real time calibration of synchronizing signal according to following steps:
The base station digital interface is received after the calibration synchronizing signal, recomputate in calibration synchronizing signal value constantly next and that source of synchronising signal is synchronous, and the synchronizing signal value after next one calibration will add up constantly is set to digital interface, digital interface is in the moment of next subframe duration, is sent to the digital interface of extension unit after synchronizing signal is added up once more; By the time in the moment of next again subframe duration, the base station side digital interface is updated to new calibration synchronizing signal value with the synchronizing signal value of self maintained; The digital interface of extension unit is updated to digital interface in the moment of next subframe duration with it after receiving new calibration synchronizing signal value synchronously.
Preferably, described initial configuration sense cycle and calibration sense cycle are set at the integral multiple of subframe duration respectively according to actual conditions.
Preferably, described source of synchronising signal is the comprehensive regularly feed system BITS of global position system GPS or building.
In addition, the invention provides a kind of TD-SCDMA system extension unit synchronizer, comprise base station synchronization signal source unit, base station main control unit, base station digital interface unit and zoom out digital interface unit and extension unit;
Described base station main control unit obtains the synchronizing signal that system synchronization needs by base station synchronization signal source unit, is sent to extension unit in real time by transmission link; After extension unit gets access to synchronizing signal, postpone the switch work of the laggard line space mouth of timing offset of setting.
Preferably, the intermediate frequency subelement of described extension unit is set the timing offset of each extension unit in such a way:
, calculate respectively as benchmark with distance base station extension unit farthest, and each extension unit is given in configuration according to the time delay measures of each extension unit and baseband processing unit.
Preferably, described base station digital interface unit periodically detects the initial configuration that whether needs extension unit is carried out synchronizing signal, in the time need carrying out initial configuration: be set to the base station digital interface unit detecting the initial value of base station main control unit constantly with synchronizing signal to synchronizing signal, the base station digital interface unit sends to after moment of a subframe duration subsequently adds 1 with initial value and zooms out digital interface unit, zooms out digital interface unit and upgrades the synchronizing signal value in the moment of next subframe duration.
Preferably, described base station digital interface unit is periodically carried out real time calibration to the synchronizing signal of extension unit.
Preferably, carry out the real time calibration of synchronizing signal in such a way:
The base station main control unit is received after the calibration synchronizing signal, recomputate in calibration synchronizing signal value constantly next and that source of synchronising signal is synchronous, and the synchronizing signal value after next one calibration will add up constantly is set to the base station digital interface unit, the base station digital interface unit is in the moment of next subframe duration, is sent to after synchronizing signal is added up once more and zooms out digital interface unit; By the time in the moment of next again subframe duration, the base station digital interface unit is updated to new calibration synchronizing signal value with the synchronizing signal value of self maintained; Zoom out after digital interface unit receives new calibration synchronizing signal value, it is updated to digital interface synchronously in the moment of next subframe duration.
Preferably, described initial configuration sense cycle and calibration sense cycle are set at the integral multiple of subframe duration respectively according to actual conditions.
Preferably, described source of synchronising signal is the comprehensive regularly feed system BITS of global position system GPS or building.
Compared with prior art, technical scheme provided by the invention has following beneficial effect:
The invention provides a kind of carry out when using baseband remote technology between base station and extension unit, the extension unit in the TD-SCDMA base station synchronous and with the implementation method of step calibration.It realizes Synchronization Design between base station and extension unit and the extension unit by the synchronous scheme of base station and extension unit principal and subordinate, and can be to carrying out real time calibration synchronously.
The present invention is in implementation procedure, only use GPS or other isochronous resources in base station side, as the comprehensive regularly feed system (BITS of building, Building Integrated Timing Supply System), and extension unit only needs to keep synchronously by transmission link and base station, that is: base station side utilizes source of synchronising signal (for example GPS) to obtain the synchronizing signal that system synchronization needs, transmission link by base station and extension unit (optical fiber or other, as twisted-pair feeder) these signals are sent to extension unit in real time, and can be as required by the real time calibration of base station side initiation to the extension unit synchronizing signal.
Below in conjunction with the drawings and specific embodiments the present invention is further described.
Description of drawings
Fig. 1 is the frame structure schematic diagram that TD-SCDMA eats dishes without rice or wine;
Fig. 2 is a 5ms frame timing relationship schematic diagram of the present invention;
Fig. 3 is that TD-SCDMA base station baseband of the present invention zooms out schematic diagram;
Fig. 4 is the reciprocal process schematic diagram between base station of the present invention and the extension unit;
Fig. 5 is a TD-SCDMA system extension unit synchronizer block diagram of the present invention;
Fig. 6 is a TD-SCDMA system extension unit synchronizing process schematic diagram of the present invention.
Embodiment
Zoom out in the TD-SCDMA base station system of design in employing, extension unit and base station be generally in same address, but distance is far away, and the extension unit by chain networking can reach tens kilometers apart from the base station farthest.Extension unit is mainly finished the frequency upconversion/downconversion of baseband signal, the functions such as control of the switch of eating dishes without rice or wine.
The TD-SCDMA system is a kind of synchro system, according to this characteristic of TD-SCDMA system, requires by the frame signal of a plurality of TD-SCDMA base station synchronous on eating dishes without rice or wine.For synchronous TD-SCDMA system, require each signal of base station to align eating dishes without rice or wine, the frame signal of promptly eating dishes without rice or wine is initial alignment of the same moment.The frame of TD-SCDMA system is the cycle with 5ms, if promptly a plurality of TD-SCDMA base station has the 5ms signal of alignment, so just can realize the signal Synchronization of eating dishes without rice or wine of different base station.Below all with the TD-SCDMA system at the subframe duration be under the situation of 5ms extension unit be that example describes synchronously.
Design for baseband extension, if extension unit is not known the 5ms frame synchronization information, then extension unit need be controlled by the base station in real time to the timing of the control/frame signal of eating dishes without rice or wine of duplexer, and design is got up like this, and comparatively complexity and reliability are low in system.And if extension unit itself is known the 5ms frame synchronization information, then extension unit can be autonomous fully to the timing of the control of duplexer and the frame signal of eating dishes without rice or wine, and so just design of energy simplified system and reliability are higher.
In the TD-SCDMA system, a wireless frame length is 10ms, is divided into two 5ms subframes.The structure of these two subframes is identical.As shown in Figure 1, be the subframe structure of TD-SCDMA system.Each subframe comprises 7 conventional time slots (TS0～6) and 3 special time slots (DwPTS, GP and UpPTS).Wherein: time slot 0 (TS0, Time Slot 0) and downlink pilot frequency channel (DwPCH, Downlink PilotChannel) are fixed as descending time slot; Ascending pilot channel (UpPCH, Uplink Pilot Channel) and TS1 are fixed as ascending time slot; TS2 to TS6 all can be configured to ascending time slot or descending time slot, is separated by transfer point (Switch Point) between the uplink and downlink time slot.A subframe has and only has two transfer points, and first transfer point (Switch Point1) is fixed between DwPCH and the UpPCH, and second transfer point (Switch Point2) position can be at the end of any one time slot among the TS1 to TS6.
The radio frames length of TD-SCDMA is 5ms (6400chip, 1chip is 0.78125us), extension unit is after getting access to 5ms synchronizing signal starting point, according to the length of each time slot in the wireless frame structure and just can know the position of switching point exactly according to the configuration of time slot, for typical Three Up Three Down configuration, first transfer point is at the GP time slot, and second transfer point is between TS3 and TS4.
In addition, the 5ms frame synchronizing signal is that this medium can be an optical fiber, also can be cable/microwave or the like by the transmission of the physical medium that is connected between base station and the extension unit.
Yet, under extension unit and base station distance situation far away, because through different propagation delay times, when the 5ms frame signal that causes coming from the base station arrives different extension unit and asynchronous, therefore also need to compensate, to guarantee the frame signal alignment of eating dishes without rice or wine according to the propagation delay time of different extension units to the base station.
The time point that comes from the 5ms frame arrival remote radio unit (RRS, Remote Radio FrequencySubsystem) of base station depends on the distance of RRS and base station.Because the TD-SCDMA system is a synchro system, the signal that requires each RRS emission is in the alignment of eating dishes without rice or wine.So should be reference with RRS farthest, as shown in Figure 2, RRS0 be nearest from the base station, and RRS7 from the base station farthest.When RRS0 gets access to the 5ms frame from the base station, need the switch work of the laggard line space mouth of time-delay Δ T1.The timing offset of each RRS distance RRS is farthest calculated and is disposed to RRS by the time delay measures of intermediate frequency unit (IFU, Intermediate Frequency Unit) according to RRS and baseband processing unit (BBU, Baseband Unit).Because the slot length of TSO and DwPTS is certain, so RRS can calculate the position of first switching point automatically, the position of second switching point is set up in the sub-district to dispose in the message by IFU and is given RRS.Because RRS does not have the data buffering ability, the field programmable gate array of IFU (FPGA:Field Programmable Gate Array) needs to send according to the relevant RRS data of time-delay situation buffer memory and in suitable moment point.
In addition, the present invention requires the distance that zooms out farthest of RRS to need less than the transmission range of 1 5ms in the time, though the present invention has this restriction, but for real system, transmission range is 1500 kilometers (by lighies velocity) above the 5ms time, therefore, this defective of the present invention program also can not be subjected to the restriction of practical application at present.
System's subframe numbers (SubSFN, Sub-System Frame Number) is a counting of radio frame number in the TD-SCDMA system.The every 5ms of the value of SubSFN increases by one.Again return when the value of SubSFN is increased to 8192 and be changed to 0, system realizes by SubSFN synchronously.The initial SubSFN counting of extension unit is by base station configuration.
Shown in Fig. 4 and 6, initial SubSFN concrete configuration procedure declaration is as follows:
Whether the software of base station indoor unit control figure interface needs extension unit is carried out initial SubSFN configuration every a sense cycle (as 80ms), when the full base station SubSFN of initiation calibrated, new initial configuration value can send to base station indoor unit control figure interface.In case receive new initial configuration value, then base station indoor unit control figure interface just begins to carry out initial SubSFN configuration, detecting the digital interface that constantly initial SubSFN (SubSFN_I) is set to the base station indoor unit, the digital interface of base station indoor unit adds 1 (SubSFN_I+1) sends to extension unit by the GP time slot digital interface with initial SubSFN Configuration Values constantly at back to back 5ms, the digital interface of extension unit is (SubSFN_I+1) in the SubSFN value of next 5ms update software interface, thereby finish the SubSFN initial configuration of extension unit, and it is synchronous to reach the SubSFN of base station side and extension unit.
After initial SubSFN configuration, also need usually carrying out the SubSFN calibration between base station and the extension unit, detailed process is described as follows:
Initiate after the SubSFN calibration base station, the software of control figure interface is received after the calibration SubSFN (SubSFN_C), recomputate in 80ms SubSFN value (SubSFN_C#) constantly next and that GPS is synchronous, and constantly (SubSFN_C#+1) is set to digital interface at next 80ms, digital interface is sent to (SubSFN_C#+1+1) digital interface of outdoor extension unit in the moment of next 5ms; Then wait until the moment of next 5ms, the base station side digital interface is updated to new calibration SubSFN value (SubSFN_C#+1+1) with the SubSFN value of oneself safeguarding again.
The digital interface of outdoor extension unit receives after (SubSFN_C#+1+1), is not updated on the software interface with (SubSFN_C#+1+1) at once, but in the moment of next 5ms, upgrades (SubSFN_C#+1+1) synchronously to software interface; New like this calibration SubSFN value (SubSFN_C#+1+1) just comes into force on outdoor extension unit, and maintenance is synchronous with base station SubSFN's.
Every 5ms constantly, after digital interface adds 1 (SubSFN_T) with the SubSFN of own maintenance, send to the digital interface of outdoor extension unit, whole process does not need the participation of software.After the digital interface of outdoor extension unit is received SubSFN_T, at once SubSFN_T is not updated in the register, but at next 5ms constantly, upgrades SubSFN_T synchronously to software interface.
The design frame chart of TD-SCDMA baseband extension base station can be as shown in Figure 3: system is made of dominant base and extension unit; wherein dominant base is seated in indoor; extension unit is seated in outdoor; extension unit is connected by optical fiber with Base station Interface Unit by zooming out interface unit; usually the cascade of extension unit is all supported in the base station, as connected in series.
Again as shown in Figure 5, TD-SCDMA baseband extension base station synchronization device specifically comprises: base station synchronization signal source unit 51, and as GPS, base station main control unit 52, both link to each other; Baseband processing unit 54, Base station Interface Unit 53, zoom out interface unit 55 and several extension units 56.
In the needs calibration, the synchronous even number that base station main control unit 52 reports by GPS51 calculates the calibration SubSFN value of base station second; Then every 5ms, the base station main control unit adds up automatically and calibrates SubSFN, be distributed to IUB interface unit 53, baseband processing unit 54 and zoom out interface unit 55 by clock/control link, these unit come into force constantly to upper layer software (applications) notice SubSFN at next 5ms; After the SubSFN that the indoor base station digital interface unit zooms out interface unit with arrival adds up, be sent to by optical fiber and zoom out digital interface unit, zoom out digital interface unit and come into force constantly to upper strata soft notice SubSFN, and add up once more and send to next extension unit at next 5ms.Like this, just can realize the asynchronous calibration of SubSFN and calibration after finishing synchronously in real time.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any 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 (14)
1. TD-SCDMA system extension unit synchronization method is characterized in that:
Base station side obtains the synchronizing signal that system synchronization needs by source of synchronising signal, is sent to extension unit in real time by transmission link; Extension unit gets access to synchronizing signal, postpones the switch work of the laggard line space mouth of timing offset of setting.
2. the method for claim 1 is characterized in that, sets the timing offset of each extension unit according to following steps:
, calculate respectively as benchmark with distance base station extension unit farthest, and each extension unit is given in configuration according to the time delay measures of each extension unit and baseband processing unit.
3. the method for claim 1 is characterized in that, according to following steps synchronizing signal is carried out initial configuration:
A, base station side periodically detect the initial configuration that whether needs extension unit is carried out synchronizing signal, then continue step B if desired, otherwise wait until that next sense cycle continues to detect;
B, detecting the digital interface that constantly initial value of synchronizing signal is set to base station side, the base station side digital interface adds the digital interface that sends to extension unit after 1 in moment of a subframe duration subsequently with initial value, and the digital interface of extension unit is upgraded the synchronizing signal value in the moment of next subframe duration.
4. the method for claim 1 is characterized in that, further comprises: base station side is periodically carried out real time calibration to the synchronizing signal of extension unit.
5. method as claimed in claim 4 is characterized in that, carries out the real time calibration of synchronizing signal according to following steps:
The base station digital interface is received after the calibration synchronizing signal, recomputate in calibration synchronizing signal value constantly next and that source of synchronising signal is synchronous, and the synchronizing signal value after next one calibration will add up constantly is set to digital interface, digital interface is in the moment of next subframe duration, is sent to the digital interface of extension unit after synchronizing signal is added up once more; By the time in the moment of next again subframe duration, the base station side digital interface is updated to new calibration synchronizing signal value with the synchronizing signal value of self maintained; The digital interface of extension unit is updated to digital interface in the moment of next subframe duration with it after receiving new calibration synchronizing signal value synchronously.
6. as claim 3 or 4 described methods, it is characterized in that described initial configuration sense cycle and calibration sense cycle are set at the integral multiple of subframe duration respectively according to actual conditions.
7. the method for claim 1 is characterized in that, described source of synchronising signal is the comprehensive regularly feed system BITS of global position system GPS or building.
8. a TD-SCDMA system extension unit synchronizer is characterized in that, comprises base station synchronization signal source unit, base station main control unit, base station digital interface unit and zooms out digital interface unit and extension unit;
Described base station main control unit obtains the synchronizing signal that system synchronization needs by base station synchronization signal source unit, is sent to extension unit in real time by transmission link; After extension unit gets access to synchronizing signal, postpone the switch work of the laggard line space mouth of timing offset of setting.
9. device as claimed in claim 8 is characterized in that, the intermediate frequency subelement of described extension unit is set the timing offset of each extension unit in such a way:
, calculate respectively as benchmark with distance base station extension unit farthest, and each extension unit is given in configuration according to the time delay measures of each extension unit and baseband processing unit.
10. device as claimed in claim 8, it is characterized in that, described base station digital interface unit periodically detects the initial configuration that whether needs extension unit is carried out synchronizing signal, in the time need carrying out initial configuration: be set to the base station digital interface unit detecting the initial value of base station main control unit constantly with synchronizing signal to synchronizing signal, the base station digital interface unit sends to after moment of a subframe duration subsequently adds 1 with initial value and zooms out digital interface unit, zooms out digital interface unit and upgrades the synchronizing signal value constantly at next subframe duration.
11. device as claimed in claim 8 is characterized in that, described base station digital interface unit is periodically carried out real time calibration to the synchronizing signal of extension unit.
12. device as claimed in claim 11 is characterized in that, carries out the real time calibration of synchronizing signal in such a way:
The base station main control unit is received after the calibration synchronizing signal, recomputate in calibration synchronizing signal value constantly next and that source of synchronising signal is synchronous, and the synchronizing signal value after next one calibration will add up constantly is set to the base station digital interface unit, the base station digital interface unit is in the moment of next subframe duration, is sent to after synchronizing signal is added up once more and zooms out digital interface unit; By the time in the moment of next again subframe duration, the base station digital interface unit is updated to new calibration synchronizing signal value with the synchronizing signal value of self maintained; Zoom out after digital interface unit receives new calibration synchronizing signal value, it is updated to digital interface synchronously in the moment of next subframe duration.
13., it is characterized in that described initial configuration sense cycle and calibration sense cycle are set at the integral multiple of subframe duration respectively according to actual conditions as claim 10 or 11 described devices.
14. device as claimed in claim 8 is characterized in that, described source of synchronising signal is the comprehensive regularly feed system BITS of global position system GPS or building.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102869086A (en) * | 2012-09-25 | 2013-01-09 | 京信通信系统（中国）有限公司 | Method and device for adjusting signal transmission time |
| WO2013097412A1 (en) * | 2011-12-28 | 2013-07-04 | 华为技术有限公司 | Method, device and system for acquiring feedback delay |
| CN103259607A (en) * | 2012-02-21 | 2013-08-21 | 中兴通讯股份有限公司 | Clock synchronization method and clock synchronization device |
| US8917621B2 (en) | 2011-12-28 | 2014-12-23 | Huawei Technologies Co., Ltd. | Method and apparatus for obtaining feedback delay |
| CN109392000A (en) * | 2017-08-09 | 2019-02-26 | 电信科学技术研究院 | It is a kind of to position, measure report method and device |
| CN112235860A (en) * | 2019-07-15 | 2021-01-15 | 中兴通讯股份有限公司 | Active antenna unit time delay alignment method and device and active antenna unit |
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| CN101166059B (en) * | 2002-06-11 | 2012-05-02 | 华为技术有限公司 | An automatic time delay measurement method and system for optical fiber remote soft base station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2013097412A1 (en) * | 2011-12-28 | 2013-07-04 | 华为技术有限公司 | Method, device and system for acquiring feedback delay |
| US8917621B2 (en) | 2011-12-28 | 2014-12-23 | Huawei Technologies Co., Ltd. | Method and apparatus for obtaining feedback delay |
| CN103259607A (en) * | 2012-02-21 | 2013-08-21 | 中兴通讯股份有限公司 | Clock synchronization method and clock synchronization device |
| CN102869086A (en) * | 2012-09-25 | 2013-01-09 | 京信通信系统（中国）有限公司 | Method and device for adjusting signal transmission time |
| CN102869086B (en) * | 2012-09-25 | 2015-06-17 | 京信通信系统（中国）有限公司 | Method and device for adjusting signal transmission time |
| CN109392000A (en) * | 2017-08-09 | 2019-02-26 | 电信科学技术研究院 | It is a kind of to position, measure report method and device |
| CN112235860A (en) * | 2019-07-15 | 2021-01-15 | 中兴通讯股份有限公司 | Active antenna unit time delay alignment method and device and active antenna unit |
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