CN101854205B - Uplink synchronization method and device and network equipment - Google Patents
Uplink synchronization method and device and network equipment Download PDFInfo
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- CN101854205B CN101854205B CN 200910048915 CN200910048915A CN101854205B CN 101854205 B CN101854205 B CN 101854205B CN 200910048915 CN200910048915 CN 200910048915 CN 200910048915 A CN200910048915 A CN 200910048915A CN 101854205 B CN101854205 B CN 101854205B
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Abstract
The invention discloses an uplink synchronization method, an uplink synchronization device and network equipment. The method comprises the following steps of: receiving a random access request initiated by a terminal; determining the arrival time range of an uplink synchronization signal according to the specific timing advance (TA) value and a signal propagation zero delay; searching the uplink synchronization signal in the arrival time range of the uplink synchronization signal according to the set detection window length; and if the uplink synchronization signal sent by the terminal according to the specific TA value is searched, continuing the random access process. The method can reduce the calculated amount of uplink synchronization detection by optimizing the uplink synchronization process, so that a home base station which uses a cheap baseband processing chip with low processing capacity can complete uplink synchronization detection.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method, device and network equipment of uplink synchronous.
Background technology
Home eNodeB (Home NodeB) is a kind of small-sized honeycomb base station, compares the characteristics that general base station has low-power, little covering, can provide the service of covering among a small circle for the client at assigned addresses such as family or office scenes.
Home eNodeB is a kind of indoor covering product of low price normally, usually can adopt shipment amount baseband processing chip large, that price is lower to realize the receiving algorithm of its air interface up link and the transmission algorithm of down link in order to reduce cost.For Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time-Division Synchronization Code Division-Multiple-Access) Home eNodeB adopts ripe and cheap TD-SCDMA terminal baseband processing chip to be one and selects preferably.
Owing to general TD-SCDMA terminal baseband processing chip designs for terminal, and must consider to realize the distinctive Baseband processing algorithm in part base station when being used for Home eNodeB, wherein to detect (being sense terminals uplink synchronous code (SYNC_UL, Synchronous Uplink)) function be that terminal does not possess and the base station is prerequisite to uplink synchronous.
The core of uplink synchronous detection algorithm is that the SYNC_UL code of preserving with this locality to received signal in the regular hour window carries out related operation, judge to receive in the signal whether have the SYNC_UL code according to correlated results, thereby learn whether have terminal to attempt to initiate the uplink random access procedure.As shown in Figure 1, be the frame structure schematic diagram of TD_SCDMA system.Wherein, the structure of descending pilot frequency time slot (DwPTS, Downlink Pilot Time Slot), protection interval (GP, General Protect), three special time slots of uplink pilot time slot (UpPTS, Uplink Pilot Time Slot) as shown in Figure 2.Traditional base station can be take GP+UpPTS as Sync_UL receive window, perhaps the GP+UpPTS+ part TS1 time is the window of Sync_UL, detects by related operation and receives the Sync_UL code that whether exists terminal to send in the signal.Suppose from length to be that the baseband receiving signals that the GP original position of 96chip begins is S (n), n=0,1 ... N-1 represents respectively the 0th to (N-1) individual chip plural number reception signal; Suppose that local 128 Sync_UL codes preserving are L (m, n), wherein m=0 ... 127, represent the code character sequence number of Sync_UL, n=0 ... 127, L (m, n) represents the complex values of n chip of m group Sync_UL code.Then the related operation result of base station detection Sync_ULSync_UL code is:
L in the formula 1
*(m, n) is the conjugation of L (m, n); Wherein, maximum occurrences (l+1) can be described as the length of detection window, and the base station need to calculate 128 correlated results of (l+1) * and carry out the uplink synchronous detection.When take GP+UpPTS as receive window, be 128 (l+1).This moment, the base station need to calculate 16384 correlated results, and namely C (0,0) is to C (127,127), and one or more and the thresholding of therefrom selecting mould value maximum is compared to mutually and judges the foundation that whether has Sync_UL in the reception signal.If receive window further enlarges, detection window will enlarge thereupon in the formula 1, and then the number of correlated results can corresponding increase.Can find out that from formula 1 wherein each correlated results needs 128 complex multiplications and 127 complex addition.Although use some fast related operation (such as the computing based on FFT) can significantly dwindle operand, for common terminal baseband processing chip, remain very considerable.
In practice process, the inventor finds through research: merely the uplink synchronous detection algorithm of traditional base station is transplanted in the ordinary terminal baseband processing chip imappropriately, the ordinary terminal baseband processing chip may can't be realized this function because not possessing enough disposal abilities; Perhaps the ordinary terminal baseband processing chip causes it not have enough resources to be engaged in the Base-Band Processing of high speed data transfer because expending ample resources for the uplink synchronous detection, thereby causes the data-handling capacity of Home eNodeB larger decline to occur.Therefore, for the Home eNodeB that uses the ordinary terminal baseband processing chip, the existing synchronization detecting method of simply continuing to use the traditional base station then can bring larger expense, even can't realize.
Summary of the invention
The embodiment of the invention provides a kind of method, device and network equipment of uplink synchronous, the uplink synchronous process is optimized, can reduce the operand that uplink synchronous detects, in order to use the Home eNodeB of ordinary terminal baseband processing chip can finish the uplink synchronous measuring ability.
The embodiment of the invention provides following technical scheme:
Propagate the scope time of advent that zero propagation is determined uplink synchronizing signals according to specific timing advance TA value and signal;
Search for uplink synchronizing signals in the time of advent of described uplink synchronizing signals in the scope with the detection window length of setting;
If search terminal with the uplink synchronizing signals that specific T A value sends, then continue random access procedure.
The embodiment of the invention provides a kind of device of uplink synchronous, comprising:
Determining unit is used for propagating the scope time of advent that zero propagation is determined uplink synchronizing signals according to specific timing advance TA value and signal;
Setup unit is used for setting detection window length;
Search unit, the detection window length that is used for setting with described setup unit is searched for uplink synchronizing signals in the time of advent of the definite uplink synchronizing signals of described determining unit in the scope;
Processing unit searches terminal with the uplink synchronizing signals that specific T A value sends if be used for described search unit, then processes according to random access procedure.
The embodiment of the invention also provides a kind of Home eNodeB, comprises the device of uplink synchronous, and wherein, described device comprises:
Determining unit is used for propagating the scope time of advent that zero propagation is determined uplink synchronizing signals according to specific timing advance TA value and signal;
Setup unit is used for setting detection window length;
Search unit, the detection window length that is used for setting with described setup unit is searched for uplink synchronizing signals in the time of advent of the definite uplink synchronizing signals of described determining unit in the scope;
Processing unit searches terminal with the uplink synchronizing signals that specific T A value sends if be used for described search unit, then processes according to random access procedure.
The method of the uplink synchronous that the embodiment of the invention provides, device and the network equipment are optimized the uplink synchronous process, can reduce the operand that uplink synchronous detects, in order to use the Home eNodeB of ordinary terminal baseband processing chip can finish the uplink synchronous measuring ability.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the frame structure schematic diagram of TD_SCDMA system in the prior art;
Fig. 2 is the structural representation of DwPTS in the prior art, GP, three special time slots of UpPTS;
Fig. 3 be Sync_DL and Sync_UL in the prior art signal transmitting and receiving regularly concern schematic diagram;
Fig. 4 is the method flow diagram of the embodiment of the invention one uplink synchronous;
Fig. 5 be the embodiment of the invention two propagation delay times be 0 and the TA of Sync_UL be fixed as 48 o'clock signal transmitting and receiving schematic diagram regularly;
Fig. 6 is the structure drawing of device of the embodiment of the invention three uplink synchronous;
Fig. 7 be the embodiment of the invention four propagation delay times be 0 and the TA of Sync_UL be fixed as 46 o'clock signal transmitting and receiving schematic diagram regularly.
Embodiment
The embodiment of the invention provides a kind of method, device and network equipment of uplink synchronous, the uplink synchronous process is optimized, can reduce the operand that uplink synchronous detects, in order to use the Home eNodeB of ordinary terminal baseband processing chip can finish the uplink synchronous measuring ability.For making purpose of the present invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings, the present invention is described in more detail.
As shown in Figure 3, for the signal transmitting and receiving of Sync_DL and Sync_UL regularly concern schematic diagram.Wherein, employed basic time unit is lasting time of 1 chip (chip), i.e. 1/ (1.28*10 in the TD-SCDMA system
6) second.In Fig. 3, the base station is at t
D0Constantly begin to send the signal of Sync_DL, according to t
D0The frame structure of the moment and TD-SCDMA can be extrapolated the standard original position t of Sync_UL
U0, t
U0With t
D0Differ the time of 160 chips, i.e. t
U0=t
D0+ 160.The Sync_DL code is through Δ t
1Propagation delay time after at t
D1Moment incoming terminal.Terminal is with t
D1Constantly as the initial time of Sync_DL signal, and can extrapolate the standard original position t of Sync_UL according to the frame structure of TD-SCDMA standard
U1, t
U1With t
D1Differ the time of 160 chips, i.e. t
U1=t
D1+ 160.And t
D1=t
D0+ Δ t
1, obviously, t
U1=t
U0+ Δ t
1Terminal can be at the standard original position t of Sync_UL when sending the signal of Sync_UL
U1Δ t before
2Constantly send, this delivery time is t
U2, obvious t
U2=t
U1-Δ t
2And the SYNC_UL signal can pass through Δ t
1Propagation delay time after at t
U3Constantly arrive the base station, obviously t
U3=t
U2+ Δ t
1
Again as shown in Figure 3, the signal propagation delay is Δ t
1, the transmission lead that terminal sends the Sync_UL signal is Δ t
2(TA).The initial time t of the Sync_UL signal that it is received for the base station
U3With its according to self regularly and the standard initial time t of the standard frame Sync_UL that calculates out
U0Compare, there is following relation in both:
t
u3=t
u0-Δt
2＋2Δt
1
Because Δ t
1The transmission range that depends on signal, Δ t
2(TA) depend on choosing of terminal self, and these two factors all are that the base station can not accurately be predicted, so the traditional base station is necessary to search for the Sync_UL signal that may exist by the slip related operation in a larger window.
Two factors of distance that the base station sense terminals sends time point that the employed window size of Sync_UL signal and terminal send the Sync_UL signal, reach terminal and base station are relevant.On the one hand, based on existing third generation collaborative project system (3GPP, 3
RdGeneration Partnership Project) standard, the terminal suitable delivery time of having the right to choose voluntarily within the specific limits, namely terminal can be set Δ t
2, herein with Δ t
2Timing advance (TA, the Timing Advanced) value that is called Sync_UL, take electromagnetic transmission time corresponding to 1 chip during as basic time unit, the span of TA is usually between 0 to 96; On the other hand, the signal timing that terminal itself is obtained is base station signal through obtaining behind the incoming terminal after the wireless channel time-delay, and for the TD-SCDMA system that spreading rate is 1.28M, road corresponding to the time of 1 chip is through propagation delay.
Yet for Home eNodeB, common covering radius is the tens of rice of number Mi Naizhi, propagation delay Δ t
1Very little, can be approximately 0.Therefore as long as fixing the TA value of terminal transmission Sync_UL, the base station just can be determined the position of uplink synchronizing signals Sync_UL substantially, and namely the possible value of l can significantly be dwindled in the formula 1, thereby reduces the computational complexity that detects synchronously.Such as when detection window length is made as 3chip, only need be calculated as follows correlated results
(formula 2)
Only need calculate 128*3 correlated results and can detect synchronously this moment, and it is much smaller than the quantity of 16384 correlated results of the prior art.
As shown in Figure 4, be the method flow diagram of the embodiment of the invention one uplink synchronous, wherein terminal sends uplink synchronizing signals with specific T A value, and then the processing procedure of Home eNodeB is as follows:
If step 403, Home eNodeB search terminal with the uplink synchronizing signals that specific T A value sends, then continue random access procedure.
Need to prove that described TA value can be any value between 0～96, be fixed as 48,46,52 etc. such as the TA value; Described detection window length is that it can be set according to actual conditions, such as being set as 3chip, 5chip etc. according to the deviation range of the upward signal due in of the timing error setting of terminal and base station.
Below by a concrete application example, such scheme of the present invention is further elaborated.
As shown in Figure 5, for the embodiment of the invention two propagation delay times be 0 and the TA of Sync_UL be fixed as 48 o'clock signal transmitting and receiving schematic diagram regularly.As can be seen from Figure, the base station can know clearly the Sync_UL actual time of arrival t that receives
U2Standard zero-time t than the Sync_UL that calculates out according to frame structure
U0Shifted to an earlier date the time of 48 chip.If give terminal the actual error that sends reservation ± 1chip between timing and the base station received signal timing, then consider the factor of device timing accuracy error, the base station can be set to 3chip with search window length.Suppose from length to be that the baseband receiving signals that the GP original position of 96chip begins is S (n), n=0,1 ... N-1 represents respectively the 0th to (N-1) individual chip plural number reception signal; Suppose that local 128 Sync_UL codes preserving are L (m, n), wherein m=0 ... 127, represent the code character sequence number of Sync_UL, n=0 ... 127, L (m, n) represents the complex values of n chip of m group Sync_UL code.Then the related operation of base station detection Sync_ULSync_UL code is:
Be that the base station need to calculate 128 * 3=384 correlated results, be respectively C (0,47), C (Isosorbide-5-Nitrae 7) ... C (127,47), C (0,48), C (Isosorbide-5-Nitrae 8) ... C (127,48), C (0,49), C (Isosorbide-5-Nitrae 9) ... C (127,49).
The method of the uplink synchronous that the embodiment of the invention one, two provides is optimized the uplink synchronous process, for example, and with propagation delay Δ t
1Ignore; The TA value that terminal is sent Sync_UL is fixing, so that the base station can be determined the position of uplink synchronizing signals Sync_UL substantially, be that the possible span of l is significantly dwindled in the formula 1, thereby can reduce the operand that uplink synchronous detects, in order to use the Home eNodeB of ordinary terminal baseband processing chip can finish the uplink synchronous measuring ability.
One of ordinary skill in the art will appreciate that and realize that all or part of step that above-described embodiment method is carried is to come the relevant hardware of instruction to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises step of embodiment of the method one or a combination set of when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics of unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
The above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
As shown in Figure 6, the structure drawing of device of the uplink synchronous that provides for the embodiment of the invention three comprises: determining unit 610, setup unit 620, search unit 630, and processing unit 640; Wherein:
Described determining unit 610 is used for propagating the scope time of advent that zero propagation is determined uplink synchronizing signals according to specific timing advance TA value and signal;
Described setup unit 620 is used for setting detection window length;
Described search unit 630, the detection window length that is used for setting with described setup unit 620 is searched for uplink synchronizing signals in the scope of the uplink synchronizing signals that described determining unit 610 is determined;
Described processing unit 640 searches described terminal with the uplink synchronizing signals that specific T A value sends if be used for described search unit 630, then processes according to random access procedure.
Wherein, described determining unit 610 is set detection window length according to the timing error of terminal and base station.Preferably, described detection window length setting is 3 chips.
Described search unit 630 can be by the method search uplink synchronizing signals of slip related operation.
In addition, the selection range of described specific TA value is between 0～96.Preferably, described specific TA value is 48.
Simultaneously, the embodiment of the invention also provides a kind of Home eNodeB, comprises the device of uplink synchronous, and its structure repeats no more shown in aforementioned herein.
Below by a concrete application example, such scheme of the present invention is further elaborated.
As shown in Figure 7, for the embodiment of the invention four propagation delay times be 0 and the TA of Sync_UL be fixed as 46 o'clock signal transmitting and receiving schematic diagram regularly.As can be seen from Figure, the base station can know clearly the Sync_UL actual time of arrival t that receives
U2Standard zero-time t than the Sync_UL that calculates out according to frame structure
U0Shifted to an earlier date the time of 46 chip.If give terminal the actual error that sends reservation ± 1chip between timing and the base station received signal timing, then consider the factor of device timing accuracy error, the base station can be set to 3chip with search window length.Suppose from length to be that the baseband receiving signals that the GP original position of 96chip begins is S (n), n=0,1 ... N-1 represents respectively the 0th to (N-1) individual chip plural number reception signal; Suppose that local 128 Sync_UL codes preserving are L (m, n), wherein m=0 ... 127, represent the code character sequence number of Sync_UL, n=0 ... 127, L (m, n) represents the complex values of n chip of m group Sync_UL code.Then the related operation of base station detection Sync_ULSync_UL code is:
Be that the base station need to calculate 128 * 3=384 correlated results, be respectively C (0,49), C (Isosorbide-5-Nitrae 9) ... C (127,49), C (0,50), C (1,50) ... C (127,50), C (0,51), C (1,51) ... C (127,51).
Need to prove that the TA value in above-described embodiment is not limited to the example in the literary composition; Described detection window length can be set according to the timing error of terminal and base station in practice, can be set as 3chip, 5chip etc., but be not limited to this.In addition, give terminal actual send regularly and base station received signal regularly between the error of reservation also can set according to actual conditions, that is to say this error be not limited to above-described embodiment ± 1chip, can also be ± 3chip etc., can certainly be error free, be 0chip.
In sum, this paper provides a kind of method, device and network equipment of uplink synchronous, the uplink synchronous process is optimized, can reduces the operand that uplink synchronous detects, in order to use the Home eNodeB of ordinary terminal baseband processing chip can finish the uplink synchronous measuring ability.
More than method, device and the network equipment of uplink synchronous provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand the solution of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (13)
1. the method for a uplink synchronous is characterized in that, comprising:
Propagate the scope time of advent that zero propagation is determined uplink synchronizing signals according to specific timing advance TA value and signal;
Search for uplink synchronizing signals in the time of advent of described uplink synchronizing signals in the scope with the detection window length of setting;
If search terminal with the uplink synchronizing signals that specific T A value sends, then continue random access procedure.
2. the method for uplink synchronous according to claim 1 is characterized in that: described detection window length is to set according to the timing error of terminal and base station.
3. the method for uplink synchronous according to claim 1 is characterized in that, described search uplink synchronizing signals is that the detection window length of setting was undertaken by the method for slip related operation in the scope in the time of advent of described uplink synchronizing signals.
4. the method for uplink synchronous according to claim 1, it is characterized in that: the selection range of described specific TA value is between 0～96.
5. the method for uplink synchronous according to claim 4, it is characterized in that: described specific TA value is 48.
6. the method for uplink synchronous according to claim 1, it is characterized in that: the detection window length of described setting is 3 chips.
7. the device of a uplink synchronous is characterized in that, comprising:
Determining unit is used for propagating the scope time of advent that zero propagation is determined uplink synchronizing signals according to specific timing advance TA value and signal;
Setup unit is used for setting detection window length;
Search unit, the detection window length that is used for setting with described setup unit is searched for uplink synchronizing signals in the time of advent of the definite uplink synchronizing signals of described determining unit in the scope;
Processing unit searches terminal with the uplink synchronizing signals that specific T A value sends if be used for described search unit, then processes according to random access procedure.
8. the device of uplink synchronous according to claim 7 is characterized in that: described determining unit is used for setting detection window length according to the timing error of terminal and base station.
9. the device of uplink synchronous according to claim 7 is characterized in that, described search unit is specifically searched for uplink synchronizing signals by the method for slip related operation.
10. the device of uplink synchronous according to claim 7, it is characterized in that: the selection range of described specific TA value is between 0～96.
11. the device of uplink synchronous according to claim 10 is characterized in that: described specific TA value is 48.
12. the device of uplink synchronous according to claim 7 is characterized in that: the detection window length of described setting is 3 chips.
13. a Home eNodeB is characterized in that, comprises the device such as the described uplink synchronous of claim 7 to 12 any one.
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| CN102457954B (en) * | 2010-10-18 | 2014-06-04 | 中国移动通信集团江苏有限公司 | Synchronization method for home base station and home base station |
| CN109474986A (en) * | 2018-12-27 | 2019-03-15 | 西安电子科技大学 | Uplink synchronisation method, device, equipment, storage medium and LTE communication system |
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| US20090061877A1 (en) * | 2006-07-14 | 2009-03-05 | Gallagher Michael D | Generic Access to the Iu Interface |
| CN101296487A (en) * | 2007-04-28 | 2008-10-29 | 中兴通讯股份有限公司 | Uplink Synchronization method for mobile communication system |
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