CN102130712A - Synchronizing method, device and base station - Google Patents
Synchronizing method, device and base station Download PDFInfo
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Abstract
The embodiment of the invention provides a synchronizing method, device and base station. The synchronizing method comprises the following steps of: determining a time offset according to a time slot proportion of subframes of a time division-synchronization code division multiple access (TD-SCDMA) system and a subframe proportion of wireless frames of a long term evolution system; and configuring the starting time of a first subframe in the wireless frames of the LTE system, wherein the starting time is ahead of time of the time offset compared with a synchronous signal, and the starting time of the first time slot in the subframe of the TD-SCDMA system is aligned with the synchronous signal. The invention realizes the uplink and downlink time slot alignment of the subframes of the TD-SCDMA system and the wireless frames of the LTE system and avoids the interference between the TD-SCDMA system and the LTE system while networking; moreover, the TD-SCDMA system and the LTE system can use the same medium ratio frequency system, thereby the cost is reduced; in addition, the synchronization of the LTE system does not depend on the TD-SCDMA system, thereby the coupling is reduced.
Description
Technical field
The embodiment of the invention relates to communication technical field, relates in particular to a kind of method for synchronous, device and base station.
Background technology
Time division duplex Long Term Evolution (Time Division Duplexing Long Term Evolution; Hereinafter to be referred as: TDD LTE) and TD SDMA (Time Division-SynchronousCode Division Multiple Access; Hereinafter to be referred as: TD-SCDMA) all belong to time division duplex (Time Division Duplexing; Hereinafter to be referred as TDD) pattern, i.e. uplink and downlink transfer are used the dual-mode of identical frequency band, distinguish uplink and downlink transfer and switch according to the time.The time slot of physical layer is divided into up, descending two parts, does not need paired frequency.But the TDD system all needs the strict synchronism between the base station, if asynchronous between the base station, then the last guild of a sub-district of possibility is subjected to the descending interference of other sub-districts, and following guild is subjected to the uplink interference of other sub-districts, if disturb very seriously, system just can't work fully like this.
The TDD system is the whole network synchro system, requires between all base stations the strict retention time synchronous.Simultaneous techniques in the TDD system between the base station mainly contains 2 kinds:
(1) utilizes the external sync port, for example: global positioning system (Global PositioningSystem; Hereinafter to be referred as: GPS), big-dipper satellite or transmit the exact time synchronization signal by the wire transmission network;
(2) pass through air interface synchronization with adjacent base station.
All there is clock system separately the base station of TDD LTE system and TD-SCDMA system, for example: GPS etc.The base station of TD-SCDMA system is with time slot 0 (Time Slot 0; Hereinafter to be referred as: TS0) synchronous reference signal with clock system output aligns; The synchronous reference signal of subframe 0 with synchro system output alignd in the base station of TDD LTE system.
When TDD LTE system and TD-SCDMA system group network, if the clock system of TDD LTE system and TD-SCDMA system reference is same set of, for example: GPS, then because the difference of the two frame structure has interference in some period; If the clock system of TDD LTE system and TD-SCDMA system reference does not have correlation, then disturbing to be at random fully, uncontrollable.
Interference when eliminating TDD LTE system and the networking of TD-SCDMA system same frequency section, TDD LTE system can obtain the up switching point of coming downwards to of TD-SCDMA system (Downlink-to-Uplink Switch Point earlier; Hereinafter to be referred as: DUSP) information and go upward to descending switching point (Uplink-to-Downlink Switch Point; Hereinafter to be referred as: UDSP) information; Then, TDD LTE system aligns the UDSP of TDD LTE system with the UDSP of TD-SCDMA system, and the DUSP of TDD LTE system is alignd with the DUSP of TD-SCDMA system.
But, in the said method, the TD-SCDMA system that depends on synchronously of TDD LTE system, the information of the TD-SCDMA system that TDD LTE system need obtain is many, for example: DUSP information and UDSP information, and also more complicated can't be obtained or obtain to these information possibly.
Summary of the invention
The embodiment of the invention provides a kind of method for synchronous, device and base station.
The embodiment of the invention provides a kind of method for synchronous, comprising:
According to the subframe proportioning of the radio frames of the time slot proportion of the subframe of TD SDMA (TD-SCDMA) system and Long Term Evolution (LTE) system, determine time offset;
The initial moment of disposing first subframe in the radio frames of described LTE system shifts to an earlier date described time offset than synchronizing signal, and initial moment and described sync line-up of first time slot in the subframe of described TD-SCDMA system.
The embodiment of the invention also provides a kind of synchronizer, comprising:
Determination module is used for the subframe proportioning according to the radio frames of the time slot proportion of the subframe of TD SDMA (TD-SCDMA) system and Long Term Evolution (LTE) system, determines time offset;
Configuration module, the initial moment that is used for disposing first subframe of radio frames of described LTE system shifts to an earlier date described time offset than synchronizing signal, and initial moment and described sync line-up of first time slot in the subframe of described TD-SCDMA system.
The embodiment of the invention also provides a kind of base station, comprises above-mentioned synchronizer.
The embodiment of the invention is determined time offset according to the subframe proportioning of the radio frames of the time slot proportion of the subframe of TD-SCDMA system and LTE system; Then, in the radio frames of configuration LTE system the initial moment of first subframe than synchronizing signal this time offset in advance, and initial moment and this sync line-up of first time slot in the subframe of TD-SCDMA system.Thereby realized that the subframe of TD-SCDMA system aligns the interference when having avoided TD-SCDMA system and LTE system group network with the uplink and downlink timeslot of the radio frames of LTE system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of an embodiment of method for synchronous of the present invention;
Fig. 2 is the flow chart of another embodiment of method for synchronous of the present invention;
Fig. 3 is the schematic diagram of an embodiment of frame structure of the radio frames of the subframe of TD-SCDMA of the present invention system and TDD LTE system;
Fig. 4 is the flow chart of another embodiment of method for synchronous of the present invention;
Fig. 5 is the structural representation of an embodiment of synchronizer of the present invention;
Fig. 6 is the structural representation of another embodiment of synchronizer of the present invention;
Fig. 7 is the structural representation of the embodiment in base station of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope of protection of the invention.
Fig. 1 is the flow chart of an embodiment of method for synchronous of the present invention, and as shown in Figure 1, this method can comprise:
LTE system in the present embodiment can be TDD LTE system, also can be the LTE (LTEAdvanced of evolution; Hereinafter to be referred as: LTE-A) system, but the embodiment of the invention is that example describes with TDD LTE.
In the present embodiment, LTE system and the same synchronizing signal of TD-SCDMA system reference.Synchronizing signal in the present embodiment can be the synchronizing signal (SYNC) of existing clock system output, for example: the synchronizing signal (SYNC) of GPS output.
The foregoing description has realized that the subframe of TD-SCDMA system aligns with the uplink and downlink timeslot of the radio frames of LTE system, interference when having avoided TD-SCDMA system and LTE system group network, and TD-SCDMA system and LTE system can use same middle radio system, have reduced cost.
Fig. 2 is the flow chart of another embodiment of method for synchronous of the present invention, and present embodiment is that TDD LTE system is that example describes with the LTE system.
As shown in Figure 2, this method can comprise:
For instance, the time slot proportion of the subframe of TD-SCDMA system is 5 descending (Down Link; Hereinafter to be referred as: DL)-2 up (Up Link; Hereinafter to be referred as: in the time of UL), the subframe proportioning that can select the radio frames of TDD LTE system is 3DL-1UL.At this moment, the frame structure of TD-SCDMA system and TDD LTE system can be as shown in Figure 3, and Fig. 3 is the schematic diagram of an embodiment of frame structure of the radio frames of the subframe of TD-SCDMA of the present invention system and TDDLTE system; Certainly the embodiment of the invention is not limited in this, Fig. 3 only is the example of frame structure of the radio frames of the subframe of TD-SCDMA system and TDD LTE system, the time slot proportion of the subframe of TD-SCDMA system also can be other numerical value, accordingly, the subframe proportioning of the radio frames of TDD LTE system also can be other numerical value, as shown in table 2, do not list one by one at this.
Wherein, the initial moment of first subframe is the initial moment of subframe 0 in the radio frames of TDD LTE system in the radio frames of TDD LTE system.
Particularly, in the TDD LTE system, each radio frames is 10 milliseconds, is divided into 10 subframes, 1 millisecond of each subframe.10 subframes are divided into 3 kinds, are respectively sub-frame of uplink, descending sub frame and special subframe.The subframe proportioning of the radio frames of TDD LTE system is in 10 subframes, the number of sub-frame of uplink, descending sub frame and special subframe and position.
Obtained after the subframe proportioning of radio frames of TDD LTE system, can determine first duration between the descending switching point of going upward in the radio frames of initial moment of subframe 0 in the radio frames of TDD LTE system and TDD LTE system, as shown in Figure 3, in the present embodiment, first duration is 3 milliseconds, i.e. 3000 microseconds.
Wherein, the initial moment of first time slot is the initial moment of time slot 0 in the subframe of TD-SCDMA system in the subframe of TD-SCDMA system.
Particularly, in the TD-SCDMA system, each wireless frame length is 10 milliseconds, comprises 25 milliseconds subframe.Each subframe comprises 7 time slots, and the time slot proportion of the subframe of TD-SCDMA system is in 7 time slots, the proportioning of ascending time slot and descending time slot.
Obtained after the time slot proportion of subframe of TD-SCDMA system, can determine second duration between the descending switching point of going upward in the subframe of initial moment of time slot 0 in the subframe of TD-SCDMA system and TD-SCDMA system, as shown in Figure 3, in the present embodiment, second duration is the duration sum of time slot 0, time slot 1, time slot 2, DwPTS, GP and UpPTS.In the TD-SCDMA system, each time slot is made up of 864 chips (chips), and the duration of each time slot is 864 chips/1.28 million per second=675 microseconds; Between the time slot 0 of the subframe of TD-SCDMA system and the time slot 1 by descending time slot (Downlink Pilot Time Slot; Hereinafter to be referred as: DwPTS), protection (Guard Period at interval; Hereinafter to be referred as: GP) and ascending time slot (Uplink Pilot Time Slot; Hereinafter to be referred as: UpPTS) form, DwPTS, GP and UpPTS are made up of 96 chips, 96 chips and 160 chips respectively, so the duration of DwPTS, GP and UpPTS is respectively 75 microseconds, 75 microseconds and 125 microseconds.
So, second duration=675 microseconds+675 microseconds+675 microseconds+75 microseconds+75 microseconds+125 microseconds=2300 microseconds.
Need to prove, the reclosing time that goes upward to descending switching point in the subframe that goes upward to TD-SCDMA system in descending switching point and the step 203 in the step 202 in the radio frames of TDD LTE system is more than or equal to predetermined first threshold, first threshold can be set according to concrete applicable cases, usually this first threshold is the positive number that is not more than 12.5 microseconds, for example: this first threshold can be made as 10 microseconds.
Present embodiment does not limit the execution sequence of step 202 and step 203, can first execution in step 202, and execution in step 203 again; Perhaps, can first execution in step 203, execution in step 202 again; Perhaps, can executed in parallel step 202 and step 203.
Be example still with frame structure shown in Figure 3, when the time slot proportion of the subframe of TD-SCDMA system is 5DL-2UL, when the subframe proportioning of the radio frames of TDD LTE system was 3DL-1UL, the difference of first duration and second duration was 3000 microseconds-2300 microsecond=700 microseconds, and promptly the time side-play amount is 700 microseconds.
In the present embodiment, can determine the up switching point that comes downwards in the subframe of TD-SCDMA system according to the time slot proportion of the subframe of TD-SCDMA system, then according to the subframe proportioning of the radio frames that comes downwards to up switching point and TDD LTE system in the subframe of TD-SCDMA system, determine the up switching point that comes downwards in the radio frames of TDD LTE system, last according to the special subframe proportioning that up switching point is determined the radio frames of TDD LTE system that comes downwards in the radio frames of TDD LTE system; Wherein, the reclosing time that comes downwards to up switching point in the radio frames that comes downwards to up switching point and TDD LTE system in the subframe of TD-SCDMA system is more than or equal to the second predetermined threshold value, second threshold value can be set according to concrete applicable cases, usually this second threshold value is the positive number that is not more than 75 microseconds, for example: second threshold value can be made as 10 microseconds.
Definite method to the special subframe proportioning of the radio frames of TDD LTE system is specifically introduced below.
The special subframe of TDD LTE system is made up of DwPTS, GP and UpPTS, in the frame structure of the radio frames of TDD LTE system, come downwards to up switching point and be arranged in GP, in the frame structure of the subframe of TD-SCDMA system, come downwards to up switching point and also be arranged in GP.For realizing TDD LTE system and TD-SCDMA system common mode, the up switching point that comes downwards in the subframe that comes downwards to up switching point and TD-SCDMA system in the radio frames of TDD LTE system is alignd, the GP that is TDD LTE system and TD-SCDMA system must have superposed part, and superposed part must be more than or equal to the second predetermined threshold value, this second threshold value can be determined according to concrete applicable cases, be generally the positive number that is not more than 75 microseconds, for example: second threshold value can be made as 10 microseconds.
In conjunction with Fig. 3, promptly require to satisfy simultaneously following (a) and (b) two conditions:
(a) finish time of the GP in the subframe that can not be later than the TD-SCDMA system finish time of the DwPTS in the radio frames of TDD LTE system;
(b) the initial moment of the UpPTS in the radio frames of TDD LTE system can not be early than the finish time of the DwPTS in the subframe of TD-SCDMA system.
Therefore, can obtain following expression:
The duration of GP in the subframe of duration+TD-SCDMA system of DwPTS in the subframe of the duration+TD-SCDMA system of time slot 0 in the subframe of duration＜time offset+TD-SCDMA system of DwPTS in the radio frames of the duration of subframe 0 in the radio frames of TDD LTE system+TDD LTE system; (1)
The duration of DwPTS in the subframe of the duration+TD-SCDMA system of time slot 0 in the subframe of duration＞time offset+TD-SCDMA system of GP in the radio frames of the duration of DwPTS+TDD LTE system in the radio frames of the duration of subframe 0 in the radio frames of TDD LTE system+TDD LTE system; (2)
In above-mentioned inequality (1) and (2), the duration of subframe 0 is fixed as 1 millisecond in the radio frames of TDD LTE system; The duration of time slot 0 is fixed as 675 microseconds in the subframe of TD-SCDMA system; The duration of the duration of DwPTS and GP is also fixed in the subframe of TD-SCDMA system, is 75 microseconds.
Behind above-mentioned numerical value substitution inequality (1) and (2), can obtain:
Duration＜time offset+675 microseconds+75 microseconds of DwPTS+75 microseconds (3) in the radio frames of 1 millisecond+TDD LTE system
Duration＞time offset+675 microseconds of GP+75 microseconds (4) in the radio frames of the duration of DwPTS+TDD LTE system in the radio frames of 1 millisecond+TDD LTE system
Because therefore duration=1 of GP millisecond in the radio frames of duration+TDD LTE system of DwPTS in the radio frames of duration+TDD LTE system of UpPTS in the radio frames of TDD LTE system can be transformed to formula (4):
Duration＞time offset+675 microseconds of UpPTS+75 microseconds (5) in the radio frames of 2 milliseconds-TDD LTE system
In formula (3) and the formula (5), the duration of the duration of DwPTS and GP is by Cyclic Prefix (Cyclic Prefix in the radio frames of TDD LTE system; Hereinafter to be referred as: CP) the special subframe proportioning of the radio frames of pattern and TDD LTE system is determined jointly.
The CP pattern of TDD LTE system comprises common CP (Normal CP) and expansion CP (ExtendedCP).
In Normal CP, each 1 millisecond of subframe is made up of 14 symbols, and wherein symbol 0 and 7 is made up of (2048+160) individual sampled point, and other symbols outside the divided-by symbol 0 and 7 are made up of (2048+144) individual sampled point;
In Extended CP, each 1 millisecond of subframe is made up of 12 symbols, and each symbol is formed by (2048+512) individual sampled point.
When the time slot proportion of the subframe of TD-SCDMA system is 5DL-2UL, when the subframe proportioning of the radio frames of TDD LTE system was 3DL-1UL, definite mode of the special subframe proportioning of the radio frames of TDD LTE system was as follows:
When the CP pattern of TDD LTE system was Normal CP, the symbolic number of supposing DwPTS was n, and the symbolic number of UpPTS is m, after substitution formula (3) and the formula (5), can obtain:
1 millisecond+(n * (2048+144)+16)/30.72＜700 microseconds+675 microseconds+75 microseconds+75 microseconds (6)
2 milliseconds-m * (2048+144)/30.72＞700 microsecond+675 microseconds+75 microseconds (7)
Can obtain by formula (6) and formula (7): symbolic number n＜7.3 of DwPTS in the radio frames of TDD LTE system, symbolic number m＜7.7 of UpPTS in the radio frames of TDD LTE system.
The special subframe of stipulating in the LTE agreement disposes 9 kinds, and is as shown in table 1.Under the Normal CP situation, the situation of having only DwPTS to get 3 symbols can satisfy the requirement of n＜7.3.Therefore the special subframe proportioning of TDD LTE system can select 0 or 5.
Table 1
In the present embodiment, the subframe proportioning and the special subframe proportioning of the radio frames of the TDD LTE system of the time slot proportion correspondence of the subframe of 3 kinds of TD-SCDMA systems, and the time offset that calculates can be as shown in table 2.
Table 2
Wherein, the initial moment of first subframe is the initial moment of subframe 0 in the radio frames of TDD LTE system in the radio frames of TDD LTE system, and the initial moment of first time slot is the initial moment of time slot 0 in the subframe of TD-SCDMA system in the subframe of TD-SCDMA system.
Particularly, in the present embodiment, the synchronizing signal (SYNC) of the same set of clock system output of TDD LTE system and TD-SCDMA system reference, for example: the 1pps pulse of GPS output, the initial moment of time slot 0 aligns with SYNC in the subframe of configuration TD-SCDMA system, the initial moment of subframe 0 shifts to an earlier date above-mentioned time offset than SYNC in the radio frames of TDD LTE system, in the present embodiment, this time offset is 700 microseconds, the initial moment of promptly disposing subframe 0 in the radio frames of TDD LTE system is than SYNC 700 microseconds in advance, as shown in Figure 3.The uplink and downlink timeslot of the subframe of the radio frames of TDD LTE system and TD-SCDMA system alignment like this comes downwards to up switching point and goes upward to descending switching point and also aligns.
The foregoing description has realized that the subframe of TD-SCDMA system aligns with the uplink and downlink timeslot of the radio frames of TDD LTE system, even the TD-SCDMA system is different with the frame structure of TDD LTE system, the overlapping and interference that causes of up-downgoing can not appear when TD-SCDMA system and TDD LTE system group network yet; When TDD LTE system and TD-SCDMA system group network, can realize coming downwards to up switching point and go upward to descending switching point and align, therefore can use same in radio system, reduced cost; In addition, the TD-SCDMA system that do not rely on synchronously of TDD LTE system has reduced coupling.
Fig. 4 is the flow chart of another embodiment of method for synchronous of the present invention, and present embodiment is that TDD LTE system is that example describes with the LTE system.
As shown in Figure 4, this embodiment can comprise:
Step 401 according to the subframe proportioning of the radio frames of TDD LTE system, is selected the time slot proportion of the subframe of TD-SCDMA system.
Particularly, the subframe proportioning of the radio frames of TDD LTE system can be chosen any one kind of them from #2 (3DL-1UL), #1 (2DL-2UL), these 3 kinds of subframe proportionings of #0 (1DL-3UL), selects the time slot proportion of the subframe of TD-SCDMA system then according to the subframe proportioning of the radio frames of TDD LTE system.
In the present embodiment, the subframe proportioning that can select the radio frames of TDD LTE system is #2 (3DL-1UL), and the time slot proportion of the subframe of TD-SCDMA system is 5DL-2UL.At this moment, the frame structure of TD-SCDMA system and TDD LTE system as shown in Figure 3.Certainly the embodiment of the invention is not limited in this, Fig. 3 only is an example of the frame structure of TD-SCDMA system and TDD LTE system, the time slot proportion of the subframe of TD-SCDMA system also can be other numerical value, accordingly, the subframe proportioning of the radio frames of TDD LTE system also can be other numerical value, as shown in table 2, do not list one by one at this.
Step 402 according to the subframe proportioning of the radio frames of TDD LTE system, is determined first duration between the descending switching point of going upward in the radio frames of initial moment of first subframe in the radio frames of TDD LTE system and TDD LTE system.
Particularly, the method that provides in the method for determining first duration in the present embodiment and the present invention's step 202 embodiment illustrated in fig. 2 is identical, does not repeat them here.In the present embodiment, first duration is 3 milliseconds, i.e. 3000 microseconds.
Step 403 according to the time slot proportion of the subframe of TD-SCDMA system, is determined second duration between the descending switching point of going upward in the subframe of initial moment of first time slot in the subframe of TD-SCDMA system and TD-SCDMA system.
Particularly, the method that provides in the method for determining second duration in the present embodiment and the present invention's step 203 embodiment illustrated in fig. 2 is identical, does not repeat them here.In the present embodiment, second duration is 2300 microseconds.
Need to prove, the reclosing time that goes upward to descending switching point in the subframe that goes upward to TD-SCDMA system in descending switching point and the step 403 in the step 402 in the radio frames of TDD LTE system is more than or equal to predetermined first threshold, first threshold can be set according to concrete applicable cases, usually this first threshold is the positive number that is not more than 12.5 microseconds, for example: this first threshold can be made as 10 microseconds.
Present embodiment does not limit the execution sequence of step 402 and step 403, can first execution in step 402, and execution in step 403 again; Perhaps, can first execution in step 403, execution in step 402 again; Perhaps, can executed in parallel step 402 and step 403.
Step 404 is calculated the difference of first duration and second duration, and this difference is time offset.
Be example still with frame structure shown in Figure 3, when the subframe proportioning of the radio frames of TDD LTE system is 3DL-1UL, when the time slot proportion of the subframe of TD-SCDMA system was 5DL-2UL, the difference of first duration and second duration was 3000 microseconds-2300 microsecond=700 microseconds, and promptly the time side-play amount is 700 microseconds.
Wherein, the method that provides in definite method of the special subframe proportioning of the radio frames of TDD LTE system and the present invention's step 204 embodiment illustrated in fig. 2 is identical, does not repeat them here.
In the present embodiment, the time slot proportion of the special subframe proportioning of the subframe proportioning correspondence of the radio frames of 3 kinds of TDD LTE systems and the subframe of TD-SCDMA system, and the time offset that calculates can be as shown in table 3.
Table 3
Wherein, the initial moment of first subframe is the initial moment of subframe 0 in the radio frames of TDD LTE system in the radio frames of TDD LTE system, and the initial moment of first time slot is the initial moment of time slot 0 in the subframe of TD-SCDMA system in the subframe of TD-SCDMA system.
Particularly, in the present embodiment, the synchronizing signal (SYNC) of the same set of clock system output of TDD LTE system and TD-SCDMA system reference, for example: the 1pps pulse of GPS output, the initial moment of time slot 0 aligns with SYNC in the subframe of configuration TD-SCDMA system, the initial moment of subframe 0 shifts to an earlier date above-mentioned time offset than SYNC in the radio frames of TDD LTE system, in the present embodiment, this time offset is 700 microseconds, the initial moment of promptly disposing subframe 0 in the radio frames of TDD LTE system is than SYNC 700 microseconds in advance, as shown in Figure 3.The uplink and downlink timeslot of the subframe of the radio frames of TDD LTE system and TD-SCDMA system alignment like this comes downwards to up switching point and goes upward to descending switching point and also aligns.
The foregoing description has realized that the subframe of TD-SCDMA system aligns with the uplink and downlink timeslot of the radio frames of TDD LTE system, even the TD-SCDMA system is different with the frame structure of TDD LTE system, the overlapping and interference that causes of up-downgoing can not appear when TD-SCDMA system and TDD LTE system group network yet; When TDD LTE system and TD-SCDMA system group network, can realize coming downwards to up switching point and go upward to descending switching point and align, therefore can use same in radio system, reduced cost; In addition, the TD-SCDMA system that do not rely on synchronously of TDD LTE system has reduced coupling.
Fig. 2 of the present invention or embodiment illustrated in fig. 4 be that TDD LTE system is that example describes with the LTE system, when the LTE system was the LTE-A system, embodiment was identical with the execution mode of Fig. 2 of the present invention or introduction embodiment illustrated in fig. 4, does not repeat them here.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 5 is the structural representation of an embodiment of synchronizer of the present invention, and the synchronizer of present embodiment can be used as the part of base station, realizes the present invention's flow process embodiment illustrated in fig. 1.As shown in Figure 5, this synchronizer can comprise: determination module 51 and configuration module 52.
Wherein, determination module 51 is used for the subframe proportioning according to the radio frames of the time slot proportion of the subframe of TD-SCDMA system and LTE system, determines time offset;
In the present embodiment, LTE system and the same synchronizing signal of TD-SCDMA system reference.Synchronizing signal in the present embodiment can be the synchronizing signal (SYNC) of existing clock system output, for example: the synchronizing signal (SYNC) of GPS output.
Above-mentioned synchronizer has realized that the subframe of TD-SCDMA system aligns the interference when having avoided TD-SCDMA system and LTE system group network with the uplink and downlink timeslot of the radio frames of LTE system; In addition, the TD-SCDMA system that do not rely on synchronously of LTE system has reduced coupling.
Fig. 6 is the structural representation of another embodiment of synchronizer of the present invention, and the synchronizer of present embodiment can be used as the part of base station, realizes Fig. 1 of the present invention, Fig. 2 or flow process embodiment illustrated in fig. 4.As shown in Figure 6, this synchronizer can comprise: determination module 61 and configuration module 62.In addition, this synchronizer can also comprise selection module 63; Perhaps, this synchronizer can also comprise the first switching point determination module 64, the second switching point determination module 65 and proportioning determination module 66; Perhaps, this synchronizer can also comprise selection module 63, the first switching point determination module 64, the second switching point determination module 65 and proportioning determination module 66.
Wherein, determination module 61 is used for the subframe proportioning according to the radio frames of the time slot proportion of the subframe of TD-SCDMA system and LTE system, determines time offset; Particularly, in the present embodiment, determination module 61 can comprise: first determines submodule 611, second definite submodule 612 and the calculating sub module 613.
Wherein, first determines to be used for the subframe proportioning according to the radio frames of LTE system by submodule 611, determines first duration between the descending switching point of going upward in the radio frames of initial moment of first subframe in the radio frames of LTE system and this LTE system;
Second determines to be used for the time slot proportion according to the subframe of TD-SCDMA system by submodule 612, determines second duration between the descending switching point of going upward in the subframe of initial moment of first time slot in the subframe of TD-SCDMA system and this TD-SCDMA system; Wherein, the reclosing time that goes upward to descending switching point in the subframe that goes upward to descending switching point and TD-SCDMA system in the radio frames of LTE system is more than or equal to predetermined first threshold, first threshold can be set according to concrete applicable cases, usually this first threshold is the positive number that is not more than 12.5 microseconds, for example: this first threshold can be made as 10 microseconds;
Calculating sub module 613 is used to calculate the difference of first duration and second duration, and this difference is time offset.
Configuration module 62, the initial moment that is used for disposing first subframe of radio frames of LTE system shifts to an earlier date above-mentioned time offset than synchronizing signal, and initial moment and above-mentioned sync line-up of first time slot in the subframe of TD-SCDMA system.
In the present embodiment, select module 63, be used for time slot proportion, select the subframe proportioning of the radio frames of LTE system according to the subframe of TD-SCDMA system; And/or selection module 63 is used for the subframe proportioning according to the radio frames of LTE system, selects the time slot proportion of the subframe of TD-SCDMA system.
In the present embodiment, the first switching point determination module 64, be used for according to the time slot proportion of the subframe of TD-SCDMA system determine the TD-SCDMA system subframe come downwards to up switching point;
The second switching point determination module 65, the subframe proportioning of the radio frames that comes downwards to up switching point and LTE system that is used for the subframe of the TD-SCDMA system that determines according to the first switching point determination module 64 is determined the up switching point that comes downwards in the radio frames of LTE system; Wherein, the reclosing time that comes downwards to up switching point in the radio frames that comes downwards to up switching point and LTE system in the subframe of TD-SCDMA system is more than or equal to the second predetermined threshold value; Second threshold value can be set according to concrete applicable cases, and this second threshold value is the positive number that is not more than 75 microseconds usually, for example: second threshold value can be made as 10 microseconds;
Proportioning determination module 66, be used for the LTE system that determines according to the second switching point determination module 65 radio frames come downwards to the special subframe proportioning that up switching point is determined the radio frames of LTE system.
The foregoing description has realized that the subframe of TD-SCDMA system aligns with the uplink and downlink timeslot of the radio frames of LTE system, can not occur the overlapping and interference that causes of up-downgoing when TD-SCDMA system and LTE system group network; When LTE system and TD-SCDMA system group network, can use same middle radio system, reduce cost.
Fig. 7 is the structural representation of the embodiment in base station of the present invention, and as shown in Figure 7, this base station can comprise: synchronizer 71, baseband processing module 72 and middle radio frequency processing module 73;
Wherein, synchronizer 71 is used for the subframe proportioning according to the radio frames of the time slot proportion of the subframe of TD-SCDMA system and LTE system, determines time offset; And in the radio frames of configuration LTE system the initial moment of first subframe shift to an earlier date above-mentioned time offset than synchronizing signal, and initial moment and this sync line-up of first time slot in the subframe of TD-SCDMA system; Particularly, this synchronizer 71 can be realized by Fig. 5 of the present invention or synchronizer shown in Figure 6;
Baseband processing module 72 is used for the data of the radio frames of the LTE system after synchronizer 71 configuration are carried out Base-Band Processing; And the data in the subframe of the TD-SCDMA system after synchronizer 71 configuration are carried out Base-Band Processing;
Middle radio frequency processing module 73 is used for by the data after 72 processing of antenna transmitting baseband processing module.
The foregoing description has realized that the subframe of TD-SCDMA system aligns with the uplink and downlink timeslot of the radio frames of LTE system, can not occur the overlapping and interference that causes of up-downgoing when TD-SCDMA system and LTE system group network; And, when LTE system and TD-SCDMA system group network, can use same middle radio frequency processing module 73, reduced cost.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the 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 among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (12)
1. a method for synchronous is characterized in that, comprising:
According to the subframe proportioning of the radio frames of the time slot proportion of the subframe of TD SDMA (TD-SCDMA) system and Long Term Evolution (LTE) system, determine time offset;
The initial moment of disposing first subframe in the radio frames of described LTE system shifts to an earlier date described time offset than synchronizing signal, and initial moment and described sync line-up of first time slot in the subframe of described TD-SCDMA system.
2. method according to claim 1 is characterized in that, the subframe proportioning of the time slot proportion of described subframe according to TD SDMA (TD-SCDMA) system and the radio frames of Long Term Evolution (LTE) system is determined also to comprise before the time offset:
According to the time slot proportion of the subframe of described TD-SCDMA system, select the subframe proportioning of the radio frames of described LTE system.
3. method according to claim 1 is characterized in that, the subframe proportioning of the time slot proportion of described subframe according to TD SDMA (TD-SCDMA) system and the radio frames of Long Term Evolution (LTE) system is determined also to comprise before the time offset:
According to the subframe proportioning of the radio frames of described LTE system, select the time slot proportion of the subframe of described TD-SCDMA system.
4. according to any described method of claim 1-3, it is characterized in that, the subframe proportioning of the time slot proportion of described subframe according to TD SDMA (TD-SCDMA) system and the radio frames of Long Term Evolution (LTE) system, determine that time offset comprises:
According to the subframe proportioning of the radio frames of described LTE system, determine first duration between the descending switching point of going upward in the radio frames of initial moment of first subframe in the radio frames of described LTE system and described LTE system;
According to the time slot proportion of the subframe of described TD-SCDMA system, determine second duration between the descending switching point of going upward in the subframe of initial moment of first time slot in the subframe of described TD-SCDMA system and described TD-SCDMA system;
Calculate the difference of described first duration and described second duration, described difference is described time offset.
5. method according to claim 4 is characterized in that, the reclosing time that goes upward to descending switching point in the subframe that goes upward to descending switching point and described TD-SCDMA system in the radio frames of described LTE system is more than or equal to predetermined first threshold.
6. method according to claim 1 is characterized in that, also comprises:
Determine the up switching point that comes downwards in the subframe of described TD-SCDMA system according to the time slot proportion of the subframe of described TD-SCDMA system;
According to the subframe proportioning of the radio frames that comes downwards to up switching point and described LTE system in the subframe of described TD-SCDMA system, determine the up switching point that comes downwards in the radio frames of described LTE system; Wherein, the reclosing time that comes downwards to up switching point in the radio frames that comes downwards to up switching point and described LTE system in the subframe of described TD-SCDMA system is more than or equal to the second predetermined threshold value;
According to the special subframe proportioning that up switching point is determined the radio frames of described LTE system that comes downwards in the radio frames of described LTE system.
7. a synchronizer is characterized in that, comprising:
Determination module is used for the subframe proportioning according to the radio frames of the time slot proportion of the subframe of TD SDMA (TD-SCDMA) system and Long Term Evolution (LTE) system, determines time offset;
Configuration module, the initial moment that is used for disposing first subframe of radio frames of described LTE system shifts to an earlier date described time offset than synchronizing signal, and initial moment and described sync line-up of first time slot in the subframe of described TD-SCDMA system.
8. device according to claim 7 is characterized in that, also comprises:
Select module, be used for time slot proportion, select the subframe proportioning of the radio frames of described LTE system according to the subframe of described TD-SCDMA system; And/or,
Described selection module is used for the subframe proportioning according to the radio frames of described LTE system, selects the time slot proportion of the subframe of described TD-SCDMA system.
9. according to claim 7 or 8 described devices, it is characterized in that described determination module comprises:
First determines submodule, is used for the subframe proportioning according to the radio frames of described LTE system, determines first duration between the descending switching point of going upward in the radio frames of initial moment of first subframe in the radio frames of described LTE system and described LTE system;
Second determines submodule, be used for time slot proportion, determine second duration between the descending switching point of going upward in the subframe of initial moment of first time slot in the subframe of described TD-SCDMA system and described TD-SCDMA system according to the subframe of described TD-SCDMA system;
Calculating sub module is used to calculate the difference of described first duration and described second duration, and described difference is described time offset;
Wherein, the reclosing time that goes upward to descending switching point in the subframe that goes upward to descending switching point and described TD-SCDMA system in the radio frames of described LTE system is more than or equal to predetermined first threshold.
10. synchronizer according to claim 7 is characterized in that, also comprises:
The first switching point determination module, be used for according to the time slot proportion of the subframe of described TD-SCDMA system determine described TD-SCDMA system subframe come downwards to up switching point;
The second switching point determination module, the subframe proportioning of the radio frames that comes downwards to up switching point and described LTE system that is used for the subframe of the TD-SCDMA system that determines according to the described first switching point determination module is determined the up switching point that comes downwards in the radio frames of described LTE system; Wherein, the reclosing time that comes downwards to up switching point in the radio frames that comes downwards to up switching point and described LTE system in the subframe of described TD-SCDMA system is more than or equal to the second predetermined threshold value;
The proportioning determination module is used for the special subframe proportioning that up switching point is determined the radio frames of described LTE system that comes downwards to of the LTE system that determines according to the described second switching point determination module.
11. a base station is characterized in that, comprises any described synchronizer according to claim 7-10.
12. base station according to claim 11 is characterized in that, also comprises:
Baseband processing module is used for the data of the radio frames of the LTE system after the configuration of described synchronizer are carried out Base-Band Processing; And the data in the subframe of the TD-SCDMA system after the configuration of described synchronizer are carried out Base-Band Processing;
In the radio frequency processing module, be used for launching data after described baseband processing module is handled by antenna.
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| CN2010100039412A CN102130712A (en) | 2010-01-13 | 2010-01-13 | Synchronizing method, device and base station |
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Application publication date: 20110720 |