CN101047428A - Device and method for support transmitting multi-mode base station clock synchronous signal - Google Patents
Device and method for support transmitting multi-mode base station clock synchronous signal Download PDFInfo
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Abstract
A method for transmitting clock synchronous signal supporting multimode base station includes generating system clock according to clock inputted into base station, generating synchronous burst containing synchronous information in system supported by multimode base station according to generated system clock and outputting system clock and synchronous burst to rear panel of multimode base station. The device used for realizing said method is also disclosed.
Description
Technical field
The present invention relates to the signal tranmission techniques, relate in particular to the apparatus and method of supporting that the Multi-Mode Base Station clock sync signal transmits.
Background technology
In the research and development of base station; industry has been released the type of Multi-Mode Base Station; Multi-Mode Base Station promptly is the base station that can support two or more radio open standards in the rack of a base station simultaneously; for example support gsm (GSM simultaneously; Global System for Mobilecommunications), Wideband Code Division Multiple Access (WCDMA) (WCDMA; Wideband Code Division MultipleAccess) and CDMA 2000 radio open standards such as (CDMA2000, Code Division Multiple Access 2000).
For the transmission problem of the clock sync signal of Multi-Mode Base Station, current have two kinds of settling modes.The first is stacked on the veneer of different systems in the rack, and the veneer of different systems is not shared.Therefore, for public part, modules such as for example master control, transmission, clock synchronization all do not have to share.Specifically referring to Fig. 1, Fig. 1 is the schematic diagram according to the multichannel synchronizing signal transmission of prior art one.As can see from Figure 1, the transmission separate processes of the clock sync signal of different systems, do not share, the clock system that is different systems is according to the timing reference input that is obtained, handle and recover the required clock sync signal of this standard respectively, for example system clock, frame timing cycle signal and frame number etc. send system clock, frame timing cycle signal and frame number to the base band veneer of this standard then respectively by backboard by the clock bus of each standard.Yet this settling mode need keep many cover clock bus on backboard, and in general, clock sync signal need be sent to a plurality of base band veneers by clock bus, consider the importance of clock sync signal again, need carry out active and standby part of design clock bus, so, cabling on the backboard is a lot, influence signal quality, bring difficulty also for printed circuit board (PCB) (PCB, the Printed Circuit Block) design of backboard, in addition, also increase design cost.
Another settling mode that the Multi-Mode Base Station clock sync signal transmits problem is, clock sync signal for multiple different systems, the unified employing transmitted global positioning system (GPS, Global PositionSystem) method of standard second signal and gps time, GPS standard second signal is 1 pulse (1PPS each second, 1 Pulse Per Second), be the standard second signal of GPS output; Gps time is the standard time of atomic clock on the satellite of GPS output; GPS standard second signal and gps time cooperate the absolute time that can obtain current time, can form clock frequency signal.Specifically referring to Fig. 2, Fig. 2 is according to the transmission GPS standard second signal of prior art two and the schematic diagram of gps time.As can see from Figure 2, different systems all adopts unified GPS standard second signal and gps time as clock reference, and the base band veneer of each standard recovers the required system clock of this standard, frame timing cycle signal and frame number respectively according to the GPS standard second signal and the gps time that transmit by backboard.Yet this settling mode requires no matter which type of is eated dishes without rice or wine standard all to need the support of GPS, in fact, does not need time synchronized such as standards such as WCDMA and GSM, can not adopt GPS fully, and therefore, the cost of this solution is higher.
Summary of the invention
In view of this; the object of the present invention is to provide a kind of device of supporting that the Multi-Mode Base Station clock sync signal transmits; solve the transmission problem of Multi-Mode Base Station clock sync signal at low cost; particularly; this device comprises: be used for according to the clock reference that is input to Multi-Mode Base Station produce and the output system clock to the system clock generation module of multimode base station backboard, this device also comprises:
Synchronization Burst (burst) generation module is used for generating according to system clock the synchronous burst of the synchronizing information that comprises standard that Multi-Mode Base Station is supported, and synchronous burst is exported to the backboard of Multi-Mode Base Station.
Described synchronous burst generation module comprises:
First frequency divider is used for dividing from described system clock the periodic signal of the synchronous burst that occurs frequently, and the output periodic signal is to the multi-frame generation module;
Support the multi-frame generation module that standard quantity is identical with Multi-Mode Base Station, be used for producing according to described periodic signal the multi-frame of the synchronizing information that contains required standard, the output multi-frame is to multiplexing framing module;
Multiplexing framing module is used for according to system clock and periodic signal the multi-frame of multi-frame generation module output being carried out multiplexing framing, generates the synchronous burst of the synchronizing information that comprises standard that Multi-Mode Base Station is supported, exports synchronous burst to the base station backboard.
Described multi-frame generation module comprises:
Second frequency divider is used for according to the synchronous periodic signal branch of burst signal multiframe period that occurs frequently;
The effective judge module of standard, be used for according to multiframe period signal and synchronously the periodic signal of burst judge whether standard effective;
Counter, be used for by to multiframe period signal count the generation frame number;
Cyclical Redundancy Check (CRC) verification module is used for the frame number that pre-configured system types, the judged result sum counter of the effective judge module output of standard are exported is carried out CRC check;
The framing module is used for the result to pre-configured system types, the effective judge module output of standard, the frame number of counter output and the check value of CRC check module output and arranges, and composition and output multi-frame are to multiplexing framing module.
Described synchronous burst generation module further comprises:
The temporal information frame module is used for generating the temporal information frame that comprises gps time information according to described periodic signal and gps time, and the output time information frame is to multiplexing framing module;
Described multiplexing framing module is used for the temporal information frame of the multi-frame of multi-frame generation module output and the output of temporal information frame module is carried out multiplexing framing.
The present invention also provides a kind of method of supporting that the Multi-Mode Base Station clock sync signal transmits in addition, solves the transmission problem of Multi-Mode Base Station clock sync signal at low cost, and particularly, this method comprises:
The clock reference that A, basis input to Multi-Mode Base Station produces system clock;
B, generate the synchronous burst of the synchronizing information that comprises standard that Multi-Mode Base Station is supported, and system clock and synchronous burst are exported to the backboard of Multi-Mode Base Station according to the system clock that produced.
Described step B comprises:
B1, according to the occur frequently periodic signal of synchronous burst of described system clock branch;
B2, according to divide the synchronous burst that occurs frequently periodic signal produce and to support standard quantity multi-frame identical, that comprise synchronizing information with Multi-Mode Base Station;
B3, multi-frame is carried out multiplexing framing, produce synchronous burst, be sent to the backboard of Multi-Mode Base Station together with system clock according to described system clock and periodic signal.
Described step B2 comprises:
B21, according to occur frequently signal multiframe period of corresponding standard of the periodic signal branch of described synchronous burst;
B22, according to divide occur frequently multiframe period signal and synchronously the periodic signal of burst judge whether corresponding standard effective;
B23, by to described multiframe period signal count the generation frame number;
B24, effectively whether value and the frame number that produced carry out CRC check to pre-configured system types, the standard judged;
B25, with described system types, standard whether effectively, frame number and CRC check value rearrange multi-frame;
B26, repeat above step, until the multi-frame that has produced all standards that Multi-Mode Base Station is supported.
When the support of GPS was arranged, between described step B2 and step B3, this method further comprised: according to periodic signal and the gps time generation time information frame of described synchronous burst; Described in the step B3 multi-frame being carried out multiplexing framing comprises: multi-frame and temporal information frame are carried out multiplexing framing.Described temporal information frame comprises: temporal information type, temporal information and Cyclical Redundancy Check CRC information.Whether described temporal information comprises: effectively, temporal information content, jump second and global position system GPS time.
The cycle of described synchronous burst is 10 milliseconds.
Be the least common multiple in standard self frame timing cycle and synchronous burst cycle described multiframe period.
Described synchronous burst comprises: fixing start bit, pre-configured standard number, multi-frame and fixing stop bits.Described synchronous burst further comprises: the temporal information frame.
Can see that from above technical scheme the apparatus and method that support Multi-Mode Base Station clock sync signal provided by the invention transmits have following beneficial effect:
1, because the present invention's synchronous information such as frame number that various standards are required forms Synchronization Burst (burst) by multiplexing framing, and employing same system clock, so Synchronization Burst and system clock can be overlapped the base band veneer that the synchronised clock bus sends various standards to one, thereby reduced the cabling on the backboard, reduced cost simultaneously;
2, because the shared cover bus of the clock sync signal of multiple standard has reduced the interconnect bus between clock veneer and the base band veneer, improve the signal quality of monoboard clock signal, and reduced relevant interface device, reduced equipment cost;
3, because scheme provided by the invention is to form synchronous burst by multiplexing framing, so can satisfy the clock synchronization demand of single mode base station by revising software arrangements;
When 4, scheme provided by the invention need be supported new standard in the base station, only need to revise a software arrangements relevant and get final product, thereby make the autgmentability of base station and adaptability strong with synchronous burst.
Description of drawings
Fig. 1 is the schematic diagram according to the multichannel synchronizing signal transmission of prior art one;
Fig. 2 is according to the transmission GPS standard second signal of prior art two and the schematic diagram of gps time;
Fig. 3 is the block diagram according to the device of transmission clock synchronizing signal of the present invention;
Fig. 4 is the block diagram according to the multi-frame generation module in the synchronous burst generation module of the present invention;
Fig. 5 is the method flow diagram according to transmission clock synchronizing signal of the present invention.
Embodiment
In order to make the features and advantages of the present invention clearer, the invention will be further described in conjunction with specific embodiments with reference to the accompanying drawings.
Each base band veneer of base station is when handling miscellaneous service, usually need clock sync signal as a reference, clock sync signal comprises system clock, frame timing cycle signal and base station frame number (BFN, Basetransceiver station Frame Number), can further include temporal information.Timing reference input when system clock is managed business as each base band veneer usually; Frame timing cycle signal is generally used for representing the frame period; Frame number is generally used for locating concrete business datum, and frame timing cycle signal and frame number cooperate the position that is used for representing concrete business datum.In Multi-Mode Base Station, different systems can adopt identical system clock, but the frame timing cycle signal of different systems has nothing in common with each other, and for example, the frame timing cycle of GSM is 4.615 milliseconds (promptly 60/13 milliseconds), and the frame timing cycle of WCDMA is 10 milliseconds.Similarly, the frame number figure place of different systems also may be different, and for example, the frame number figure place of WCDMA is 12, and the frame number figure place of GSM is 22.In addition; picture CDMA2000, Time Division-Synchronous Code Division Multiple Access (TD-SCDMA; Time-Division Synchronization Code Division MultipleAccess) standard such as; also need gps time equal time information realize in the network between each base station synchronously; therefore; in the design that the clock sync signal of the Multi-Mode Base Station of supporting these standards transmits, also need temporal information is sent to the base band veneer of these standards.
Main thought of the present invention just is that the compositions such as frame timing cycle, frame number and temporal information in the clock sync signal that the base band veneer of each standard of Multi-Mode Base Station is required have the synchronous burst of anchor-frame form, and then system clock in the clock sync signal and synchronous burst are overlapped the base band veneer that clock bus sends each standard to one.Therefore, the base band veneer of the various standards of eating dishes without rice or wine of Multi-Mode Base Station can and recover the required clock sync signal of this standard the burst synchronously from the cover system clock that sends of clock bus.
Below, be example with the dual-mode base station of supporting GSM and two kinds of standards of eating dishes without rice or wine of WCDMA, describe frame format and the production process thereof of synchronous burst in detail.
Burst adopts the form of burst to transmit relevant synchronised clock information synchronously, and this burst is periodic.Here, the frame timing cycle of considering WCDMA is 10 milliseconds, also simple on handling simultaneously, and the cycle of burst is set to 10 milliseconds.Certainly, also the cycle of burst can be arranged to other numerical value, for example 20 milliseconds etc.In this synchronous burst, provide required frame number of various standards and temporal information etc. according to set form.Particularly, referring to table 1, table 1 illustrates the frame format of burst, and the unit in the table 1 is bit (bit).
| The start bit | The standard number | Type | Whether standard is effective | Frame number | ?CRC | |
| 1 | 8 | 8 | 1 | 63 | ?16 | |
| Type | Whether standard is effective | Frame number | ?CRC | |||
| 8 | 1 | 63 | ?16 | |||
| Type | Temporal information | ?CRC | Stop bits | |||
| 8 | 64 | ?16 | 1 | |||
Table 1
As shown in table 1, first row and last row are respectively start bit and the stop bits of burst in the table 1, and they take 1bit respectively, and the start bit can be high level " 1 "; Stop bits can be low level " 0 ".
Secondary series in the table 1 is the standard number, takies 8bit, and its value is represented the number of the standard of eating dishes without rice or wine of this Multi-Mode Base Station support.In the present embodiment, Multi-Mode Base Station is supported GSM and two kinds of standards of eating dishes without rice or wine of WCDMA, and therefore, the number of the standard of eating dishes without rice or wine is 2, is dual-mode base station.
Next, in the table 1 from the type to the Cyclical Redundancy Check 4 list items of (CRC, Cyclic Redundancy Check) 88bit altogether, be one group, multi-frame as a kind of standard of eating dishes without rice or wine, the synchronizing information content of representing a kind of standard of eating dishes without rice or wine is in the present embodiment with the multi-frame of this group as WCDMA, in this 88bit, initial 8bit represents type, represent standard, for example, can represent the standard of eating dishes without rice or wine of WCDMA FDD (R6) with 01h; Middle 64bit represents the content of the type, and wherein a bit represents whether this standard effective in 10 millisecond periods of burst, can represent effectively by putting 1, put 0 represent invalid; Other 63bit represents the frame number of this standard, because the frame number figure place of WCDMA is 12, so the 63bit of expression frame number enough represents the frame number of WCDMA; The last 16bit of each group is the check value of CRC, is the CRC check to this group front 72bit.4 following list items 88bit altogether are second group, and are the same with first group 88bit, only as the multi-frame of another standard of eating dishes without rice or wine, represent the information of other standard, promptly are the information of GSM standard in the present embodiment.
In table 1, also comprise last group 88bit, as the temporal information frame, be used for representing temporal information (TOD, Time Of Day), be used to represent timing informations such as the needed GPS absolute time of standard such as CDMA2000.Type can represent that the specific definition of temporal information is as shown in table 2 with 70h.
| Temporal information | ||||
| Whether effective | Idle | The TOD detailed content | Jump second | Gps time |
| 0 | ?15bit | 01h | ?8bit | ?32bit |
Table 2
In the present embodiment, because the base station is a dual-mode base station of supporting GSM and WCDMA, GSM and WCDMA do not need time synchronized, so do not need gps time, so mid-0 at the whether effectively list item of this group, it is invalid to represent, when the base station supports CDMA2000 etc. to need the standard of GSP time, can be used for expression effectively at the list item of correspondence mid-1; Next, the free time goes out 15bit; In the TOD detailed content, what represent to transmit with the 01h of 8bit is gps time; The 8bit of jump second represents difference number second between Current GPS time and the universal coordinated time (UTC, Universal Time Coordinated), and UTC is the zebra time of standard, i.e. GMT; In gps time, represent since the second number of the gps time on January 6th, 1980 with 32bit.So, in burst, comprise the TOD information shown in the table 2, can make the Multi-Mode Base Station support need the standard of gps time.
Table 1 only provides the frame format of synchronous burst under the dual-mode base station situation; when Multi-Mode Base Station is supported two or more eating dishes without rice or wine during standard; only need represent accordingly that by the software arrangements front increase of one group of express time information in the end the list item of standard gets final product according to the frame format of the burst shown in the table 1.Similarly, also can delete the list item of expression standard, satisfy the needs of single mode base station.
Below in conjunction with Fig. 3, Fig. 4 and Fig. 5, the apparatus and method of transmission clock synchronizing signal in the dual-mode base station of supporting WCDMA and two kinds of standards of eating dishes without rice or wine of GSM are described, wherein important description has the forming process of the synchronous burst of above-mentioned frame format.
Referring to Fig. 3, Fig. 3 is the block diagram of the device of transmission clock synchronizing signal.As can see from Figure 3; the device of transmission clock synchronizing signal comprises synchronous burst generation module and system clock generation module; system clock in the Multi-Mode Base Station clock sync signal is produced by the system clock generation module, in the clock sync signal corresponding to the frame number of various standards, temporal information etc. synchronously information produce by synchronous burst generation module is unified.
The system clock generation module is used for producing the required system clock of dual-mode base station according to the clock reference of input.The one tunnel synchronous burst that generates with synchronous burst generation module of system clock is input to backboard as clock sync signal, and another road is input to synchronous burst generation module.Because system clock is the clock reference of base band veneer when managing business, the base band veneer also needs to recover work clock from system clock when work, so here, base band veneer for various standards adopts same system clock, the system clock that produces through the system clock generation module is input to the base band veneer of various standards by backboard, recovers the work clock that self needs through processing such as phase-locked loops by the base band veneer.The system clock generation module can cooperate by the various software and hardwares that are used to produce system clock in the prior art to be realized, for example phase-locked loop, phase demodulation module, filtering software etc.The clock reference of input can be the timing reference input of input outside the base station, and for example radio network controller (RNC, Radio Network Controller) is exported, when needing the standard of gps time, and can also be with gps time as timing reference input.
The system clock that synchronous burst generation module is used for being produced according to the system clock generation module generates the synchronous burst of the synchronizing information that comprises standard that Multi-Mode Base Station is supported, burst is input to backboard with system clock synchronously.In the present embodiment, the burst generation module comprises first frequency divider, WCDMA multi-frame generation module, GSM multi-frame generation module, temporal information frame generation module and multiplexing framing module synchronously.
First frequency divider is used for the system clock that the system clock generation module produces is carried out frequency division, tells the cycle of synchronous burst, is exemplified as 10 milliseconds here.Whether effectively synchronously the cycle of burst is except as the reference that sends synchronous burst, also be used at the multi-frame generation module as the reference datas of various multiframe periods and judge various standards benchmark.
The multi-frame generation module is used for the cycle according to the synchronous burst of first frequency divider generation, produces the multi-frame that also output comprises various standard synchronizing informations.Specifically WCDMA multi-frame generation module and GSM multi-frame generation module in the present embodiment.
Referring to Fig. 4, the multi-frame generation module is described.Multi-frame generation module shown in Figure 4 comprises second frequency divider, the effective judge module of standard, counter, CRC check module and framing module.
Second frequency divider is used for producing signal multiframe period according to the periodic signal of synchronous burst.For WCDMA multi-frame generation module, because the frame timing cycle of WCDMA is 10 milliseconds, the cycle of burst is 10 milliseconds synchronously, WCDMA is effective all the time in the cycle of synchronous burst, so WCDMA also is 10 milliseconds multiframe period, second frequency divider is used to produce 10 milliseconds WCDMA multiframe period.For GSM multi-frame generation module, the frame timing cycle of GSM is 60/13 millisecond, the cycle of burst is 10 milliseconds synchronously, GSM is just effective when the cycle of the 6th synchronous burst, so be 60 milliseconds the multiframe period of GSM, be self frame timing cycle and the least common multiple in burst cycle synchronously, second frequency divider is used to produce 60 milliseconds GSM multiframe period.Signal multiframe period that second frequency divider is told exports the effective judge module sum counter of standard respectively to.
The effective judge module of standard be used for according to the periodic signal of synchronous burst and multiframe period signal judge whether the standard that will produce multi-frame effective, and the output judged result is to CRC check module and framing module.For WCDMA multi-frame generation module, the cycle of burst equates that with the multiframe period of WCDMA so in each synchronous burst cycle, the WCDMA standard is effective all the time, judged result is always 1 synchronously.For GSM multi-frame generation module, per six synchronous burst cycles just equate with the multiframe period of GSM, so per six synchronous burst cycles, the GSM standard is just effective, and when invalid, judged result puts 0.
Counter is used for by producing frame number to counting multiframe period, and the frame number that counter produces exports CRC check module and framing module respectively to.For WCDMA multi-frame generation module, equate with self frame timing cycle multiframe period, counter increases progressively until the figure place that reaches the WCDMA frame number with 1, it is an every input signal multiframe period in the counter, counter just adds 1, and as frame number output, until the frame number figure place that count down to WCDMA, circulation again again.For GSM multi-frame generation module, be 60 milliseconds a multiframe period, be promptly 60/13 millisecond of 13 self frame timing cycle, so counter increases progressively until the figure place that reaches the GSM frame number with 13, be a GSM of every input signal multiframe period in the counter, counter just adds 13, and exports as frame number, until the frame number figure place that count down to GSM, circulation again again.
The CRC check module be used for to system types, standard whether effectively and frame number carry out CRC check, and the output verification value is to the framing module.Wherein standard whether effectively and frame number come from the output of the effective judge module sum counter of standard respectively; system types is then pre-configured according to the design of Multi-Mode Base Station; because when the transmission of design dual-mode base station clock sync signal; just knownly in advance need to support WCDMA and the GSM standard of eating dishes without rice or wine; so when forming multi-frame, pre-configured the eat dishes without rice or wine 01h and the 04h of standard of WCDMA and GSM that represent respectively is input to CRC check module and framing module.
The framing module is used for the frame number of the result of system types, the effective judge module output of standard, counter output and the check value of CRC check module output are arranged, form the multi-frame in the form as shown in table 1, and export multi-frame to multiplexing framing module according to 10 milliseconds periodic signal.
As the standard that needs temporal information, for example during CDMA2000, also need the support of GPS, this moment is by temporal information frame generation module generation time information frame.Temporal information frame generation module is used for according to cycle and the gps time information of burst produce the temporal information frame of form as shown in Table 1 and Table 2 synchronously.At this moment, can be with the unified timing reference input of GPS as the base station.
The multi-frame of the corresponding standard that the multi-frame generation module of various standards is produced is input in the multiplexing framing module.Because start bit and the stop bits of burst are fixed synchronously, and know the standard of eating dishes without rice or wine of Multi-Mode Base Station support at the beginning of the design of Multi-Mode Base Station in advance, so the standard number also can be pre-configured.Multiplexing framing module is used for the multi-frame of input and fixing start bit, stop bits and pre-configured standard number are lined up, and forms synchronous burst as shown in table 1.When existence needed the standard of temporal information, multiplexing framing module was further used for the temporal information frame that multi-frame and temporal information frame generation module produce is carried out multiplexing, generates synchronous burst.
The system clock that synchronous burst that synchronous burst generation module is generated and system clock generation module produce is input to backboard by a cover clock bus, is sent to the base band veneer of various standards by backboard.The base band veneer can be selected standard to one's name according to the type of standard from synchronous burst frame number etc. is information synchronously, and can utilize phase-locked loop etc. to recover work clock from system clock.Therefore, the scheme that present embodiment provides only keeps a cover clock bus on backboard, with respect to prior art, reduced cabling and the interface device on the backboard, has reduced equipment cost.
Referring to Fig. 5, the method for the dual-mode base station clock sync signal transmission of supporting WCDMA and two kinds of standards of eating dishes without rice or wine of GSM is described.Fig. 5 is the method flow diagram of transmission clock synchronizing signal, and concrete steps are as follows:
The clock reference that step 501, basis are input to dual-mode base station produces the system clock of base station;
Here, the periodic signal that from system clock, divides the 10 milliseconds of synchronous burst of conduct that occur frequently.
Here, produce WCDMA multi-frame and GSM multi-frame.When needing the standard of temporal information, can also be according to the support of burst cycle and GPS synchronously, generation time information frame.The process of the multi-frame of concrete certain standard of generation is as follows:
According to divide multiframe period of the corresponding standard that occurs frequently, multiframe period be corresponding standard self frame timing cycle cycle of synchronous burst and the least common multiple in burst cycle synchronously; Cycle according to multiframe period and synchronous burst judges whether standard is effective; By to counting the generation frame number multiframe period; Effectively whether value and frame number carry out CRC check to pre-configured system types, standard; With system types, standard whether effectively, frame number and CRC check value rearrange multi-frame.
Abovely the problem that the dual-mode base station clock sync signal of supporting WCDMA and two kinds of standards of eating dishes without rice or wine of GSM transmits has been described with reference to Fig. 3, Fig. 4 and Fig. 5; yet the present invention is not limited thereto; when needs are supported multiple eating dishes without rice or wine during standard; only need suitably to revise software arrangements, the multi-frame that generates corresponding standard according to the frame format of synchronous burst gets final product.Similarly, also can satisfy the demand of single mode base station by suitable modification software arrangements.In addition, above embodiment only exemplarily describes the apparatus and method that form synchronous burst, yet the present invention also is not limited to this, and the apparatus and method of the synchronous burst of generation in addition also should be included within the scope of the present invention.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (14)
1, a kind of device of supporting that the Multi-Mode Base Station clock sync signal transmits, comprise be used for according to the clock reference that is input to Multi-Mode Base Station produce and the output system clock to the system clock generation module of multimode base station backboard, it is characterized in that this device also comprises:
Synchronization Burst burst generation module is used for generating according to system clock the synchronous burst of the synchronizing information that comprises standard that Multi-Mode Base Station is supported, and synchronous burst is exported to the backboard of Multi-Mode Base Station.
2, device according to claim 1 is characterized in that, described synchronous burst generation module comprises:
First frequency divider is used for dividing from described system clock the periodic signal of the synchronous burst that occurs frequently, and the output periodic signal is to the multi-frame generation module;
Support the multi-frame generation module that standard quantity is identical with Multi-Mode Base Station, be used for producing according to described periodic signal the multi-frame of the synchronizing information that contains required standard, the output multi-frame is to multiplexing framing module;
Multiplexing framing module is used for according to system clock and periodic signal the multi-frame of multi-frame generation module output being carried out multiplexing framing, generates the synchronous burst of the synchronizing information that comprises standard that Multi-Mode Base Station is supported, exports synchronous burst to the base station backboard.
3, device according to claim 2 is characterized in that, described multi-frame generation module comprises:
Second frequency divider is used for according to the synchronous periodic signal branch of burst signal multiframe period that occurs frequently;
The effective judge module of standard, be used for according to multiframe period signal and synchronously the periodic signal of burst judge whether standard effective;
Counter, be used for by to multiframe period signal count the generation frame number;
Cyclical Redundancy Check CRC check module is used for the frame number that pre-configured system types, the judged result sum counter of the effective judge module output of standard are exported is carried out CRC check;
The framing module is used for the result to pre-configured system types, the effective judge module output of standard, the frame number of counter output and the check value of CRC check module output and arranges, and composition and output multi-frame are to multiplexing framing module.
According to claim 2 or 3 described devices, it is characterized in that 4, described synchronous burst generation module further comprises:
The temporal information frame module is used for generating the temporal information frame that comprises gps time information according to described periodic signal and global position system GPS time, and the output time information frame is to multiplexing framing module;
Described multiplexing framing module is used for the temporal information frame of the multi-frame of multi-frame generation module output and the output of temporal information frame module is carried out multiplexing framing.
5, a kind of method of supporting that the Multi-Mode Base Station clock sync signal transmits is characterized in that this method comprises:
The clock reference that A, basis input to Multi-Mode Base Station produces system clock;
B, generate the synchronous burst of the synchronizing information that comprises standard that Multi-Mode Base Station is supported, and system clock and synchronous burst are exported to the backboard of Multi-Mode Base Station according to the system clock that produced.
6, method according to claim 5 is characterized in that, described step B comprises:
B1, according to the occur frequently periodic signal of synchronous burst of described system clock branch;
B2, according to divide the synchronous burst that occurs frequently periodic signal produce and to support standard quantity multi-frame identical, that comprise synchronizing information with Multi-Mode Base Station;
B3, multi-frame is carried out multiplexing framing, produce synchronous burst, be sent to the backboard of Multi-Mode Base Station together with system clock according to described system clock and periodic signal.
7, method according to claim 6 is characterized in that, described step B2 comprises:
B21, according to occur frequently signal multiframe period of corresponding standard of the periodic signal branch of described synchronous burst;
B22, according to divide occur frequently multiframe period signal and synchronously the periodic signal of burst judge whether corresponding standard effective;
B23, by to described multiframe period signal count the generation frame number;
B24, effectively whether value and the frame number that produced carry out CRC check to pre-configured system types, the standard judged;
B25, with described system types, standard whether effectively, frame number and CRC check value rearrange multi-frame;
B26, repeat above step, until the multi-frame that has produced all standards that Multi-Mode Base Station is supported.
8, method according to claim 6 is characterized in that, when the support of GPS was arranged, between described step B2 and step B3, this method further comprised:
Periodic signal and gps time generation time information frame according to described synchronous burst;
Described in the step B3 multi-frame being carried out multiplexing framing comprises: multi-frame and temporal information frame are carried out multiplexing framing.
9, method according to claim 8 is characterized in that, described temporal information frame comprises:
Temporal information type, temporal information and Cyclical Redundancy Check CRC information.
10, method according to claim 9 is characterized in that, described temporal information comprises:
Whether effectively, temporal information content, jump second and global position system GPS time.
According to claim 6 or 7 described methods, it is characterized in that 11, the cycle of described synchronous burst is 10 milliseconds.
According to claim 6 or 7 described methods, it is characterized in that 12, be the least common multiple in standard self frame timing cycle and synchronous burst cycle described multiframe period.
13, method according to claim 5 is characterized in that, described synchronous burst comprises:
Fixing start bit, pre-configured standard number, multi-frame and fixing stop bits.
14, method according to claim 13 is characterized in that, described synchronous burst further comprises:
The temporal information frame.
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