CN101136697B - Downlink synchronization tracking method of time-division synchronization CDMA access system - Google Patents
Downlink synchronization tracking method of time-division synchronization CDMA access system Download PDFInfo
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Abstract
This invention relates to a down-line synchronous tracking method for TD-SCDMA access system, in which, a terminal carries out SYNC down-line synchronous track based on the SYNC-DL code sequence in a down-line pilot time slot with a set SYNC-DL code tracking period to get a SYNC timed adjustment volume, if there is available Midamble timed adjustment volume based on the estimation of service time slot Midamble code channel at present, then it is weight-averaged with the timed adjustment volume and takes the averaged value as the timed adjustment volume of the down-line synchronized track to reduce UE power loss and prolongs waiting time and avoids the limitation of only utilizing Midamble channel estimation value to make down-line synchronization track.
Description
Technical field
The present invention relates to a kind of downlink synchronization tracking method of time-division synchronization CDMA access system.
Background technology
TD-SCDMA (Time Division Synchronous Code Division Multiple Access, the TD SDMA access) in the system, the up-downgoing channel is operated in identical frequency, different time slots is to UE (User Equipment, subscriber equipment), the up-downgoing channel may exist and interferes with each other, simultaneously, also exist to disturb between the different sub-districts, thus the TD-SCDMA system to synchronous requirement than higher.
In the practical application, owing to the restriction of temperature, volume, power consumption, cost etc., the frequency accuracy of the crystal oscillator that UE selects for use is not very high usually, has local crystal oscillator drift; In addition, in mobile environment, the position of UE can constantly change, and these reasons all can cause the variation regularly of UE subframe.For reception and restituted signal that can be correct, need to follow the tracks of subframe variation regularly, adjust the reception timing of this sub-district and adjacent sub-district.
Generally speaking, PN sign indicating number (Pseudo-random Number, the pseudo noise code) synchronizing process in CDMA (Code Division Multiple Access, the code division multiple access insert) system is divided into the PN sign indicating number and catches (synchronously thick) and PN code tracking (smart synchronous) two parts.It is the frequency and the phase place of the local PN sign indicating number of coarse adjustment that the PN sign indicating number is caught, and makes this locality PN sign indicating number that produces and the PN intersymbol timing error that receives less than 1 chip (chip) time interval Tc.Can adopt based on the parallel capture scheme of sliding relevant serial Acquisition Scheme or estimating based on time delay.The PN code tracking is then adjusted the local code phase place automatically, further dwindles timing error, makes it the part less than chip-spaced, reaches local code and receives PN code frequency and phase place precise synchronization.
The TD-SCDMA system also is a kind of cdma system, frame structure by the TD-SCDMA system can be known, there are two data segments to carry out down-going synchronous for terminal, be descending pilot frequency time slot DwPTS (Downlink Piloting Time Slot, the Midamble sign indicating number of SYNC-DL descending pilot frequency time slot) (DownlinkSynchronize, down-going synchronous) sign indicating number sequence and downlink business time slot (in lead sign indicating number) sequence.The data that this two time periods receive can be used for carrying out related operation with local SYNC-DL sign indicating number or Midamble sign indicating number, realize synchronously by the search correlation peak.The PN sign indicating number of TD-SCDMA system down link is caught in other words and is slightly finished in the Cell searching stage synchronously, and precision is 1 chip, and PN code tracking essence is in other words realized in the downlink synchronization tracking stage synchronously.
Realize that by above-mentioned two data segments downlink synchronization tracking respectively has pluses and minuses:
1, use the SYNC-DL sign indicating number sequence among the descending pilot frequency time slot DwPTS to realize downlink synchronization tracking (being called for short line trace under the SYNC-DL sign indicating number):
Protection between conventional time slot TS0～TS6 (Guard Period, abbreviation GP) at interval has only 16 chips, and long protection time slot GP is all arranged, the long 16chip of the GP of TS0 last part, the long 32chip of the GP that the DwPTS previous section comprises before and after the SYNC-DL.Like this, GP 48chip altogether before the SYNC-DL; If UE and service base station distance are distant, when UE does handover measurement, within 48chip, can receive the DwPTS of the Node B (B node) of a vicinity, the range difference of corresponding two the Node B of 48chip is 11.25km; Protection after SYNC-DL GP at interval is 96chip, is used for avoiding the interference between ascending pilot frequency UpPTS and the descending pilot frequency DwPTS, does not consider time delay influence, can guarantee that radius of society does not receive not interference less than 11.25km the time.That is to say, be to disturb for a short time with the benefit of DwPTS, and reasonable downlink synchronization tracking performance can be arranged.But this method needs UE in the downlink data receiving time slot, also will receive and handle the SYNC-DL sign indicating number sequence among the descending pilot frequency time slot DwPTS that the base station sends, the line correlation computing of going forward side by side, to realize downlink synchronization tracking, can strengthen the UE power consumption like this, reduce the UE stand-by time.
2, receive the business time-slot data according to UE and carry out downlink synchronization tracking (being called for short line trace under the Midamble sign indicating number):
Business time-slot all needs to carry out Midamble sign indicating number channel estimating before joint-detection, can carry out downlink synchronization tracking according to this channel estimation results.Its advantage is that downlink synchronization tracking can be directly carries out with the channel estimation results of joint-detection, does not need extra related operation, saves software and hardware resources and power consumption.Prior art typically uses Steiner (Jiri STAJNER) channel estimator and carries out joint-detection channel estimating before, estimates the channel estimation value in all Midamble skews simultaneously.
Can know by the regulation to the method for salary distribution of Midamble in 3GPP (3rd Generation Partnership Project, third generation partner program) the TS25.221 agreement:
(1) under Midamble sign indicating number default (Default) allocation model, for this sub-district UE, the Midamble skew is known, can accurately know the position of channel estimation window, carries out downlink synchronization tracking with the channel estimation value in the channel estimation window then; And, carry out the Midamble offset detection earlier for adjacent sub-district, and according to the result of offset detection, find out the channel estimation window that belongs to activation, carry out downlink synchronization tracking with the channel estimation value in the channel estimation window that activates;
(2) under Midamble sign indicating number public (Common) allocation model, no matter be this sub-district or adjacent sub-district, the Midamble skew all needs to detect, and has determined to carry out downlink synchronization tracking with the channel estimation value in the corresponding channel estimation window after the Midamble skew.
But be to use Midamble sign indicating number downlink synchronization tracking method can face following problem: when the firm start of mobile phone also is not activated joint-detection, not have available channel estimating information to use for downlink synchronization tracking; And business time-slot is not that each subframe all sends, and sometimes may not send business, and UE does not carry out the channel estimating of business time-slot, does not have available channel estimating information to use for downlink synchronization tracking yet; In addition, the performance of Midamble offset detection also can have influence on the performance of downlink synchronization tracking.
Summary of the invention
Technical problem to be solved by this invention is, overcome the deficiency of prior art downlink synchronization tracking method, propose the downlink synchronization tracking method of time-division synchronization CDMA access system that a kind of UE of saving software and hardware resources and power consumption also can guarantee the downlink synchronization tracking performance.
In order to address the above problem, the invention provides a kind of downlink synchronization tracking method of time-division synchronization CDMA access system, it is characterized in that, terminal is carried out SYNC downlink synchronization tracking based on the SYNC-DL sign indicating number sequence in the descending pilot frequency time slot with the descending tracking cycle of setting of SYNC-DL sign indicating number, obtains regularly adjustment amount of SYNC; If current have a regularly adjustment amount of available Midamble based on business time-slot Midamble sign indicating number channel estimating, then itself and above-mentioned SYNC timing adjustment amount are weighted on average, the timing adjustment amount of this weighted average as described downlink synchronization tracking.
In addition, described weighted average adopts following formula to calculate:
Δ＝β×ΔSYNC+(1-β)×ΔMidamble；
Wherein, Δ is the timing adjustment amount of described downlink synchronization tracking, and Δ SYNC is a regularly adjustment amount of described SYNC, and Δ Midamble is a regularly adjustment amount of described Midamble;
β is a weight coefficient, 0＜β＜1.
In addition, described β value is set according to system emulation or field testing.
In addition, if current no available described Midamble timing adjustment amount, then with the timing adjustment amount of described SYNC timing adjustment amount as described downlink synchronization tracking.
In addition, if system does not have the demodulation business time-slot, the descending tracking cycle of then described SYNC-DL sign indicating number is the following line trace basic cycle; Otherwise the descending tracking cycle of described SYNC-DL sign indicating number is set to down N times of line trace basic cycle, and N is an integer, N＞1.
In addition, described N value is set according to system emulation or field testing, and under the prerequisite that satisfies the system communication performance requirement, selection can make described power consumption of terminal reach minimum N value.
In addition, when system is carrying out joint-detection demodulation business time-slot, with the described Midamble timing adjustment amount of described output of following line trace basic cycle based on business time-slot Midamble sign indicating number channel estimating.
As from the foregoing, the present invention carries out line trace under the Midamble sign indicating number by when the current joint-detection demodulation business time-slot, at this moment can carry out line trace under the SYNC sign indicating number with the bigger cycle; In the time can't carrying out under the Midamble sign indicating number line trace, carry out line trace under the SYNC sign indicating number with the less cycle; With the weighted average of two kinds of methods as final frame adjustment amount regularly, can reduce the UE power consumption with respect to only utilizing SYNC-DL sign indicating number sequence to carry out downlink synchronization tracking, prolongs standby time also can avoid only utilizing the channel estimation value of Midamble to carry out the limitation of downlink synchronization tracking.
Description of drawings
Line trace execution cycle schematic diagram under the SYNC-DL sign indicating number of Fig. 1 when not carrying out line trace under the Midamble sign indicating number;
Line trace execution cycle schematic diagram under the SYNC-DL sign indicating number of Fig. 2 when carrying out line trace under the Midamble sign indicating number;
Fig. 3 is an embodiment of the invention TD-SCDMA system descending method for synchronized flow chart.
Embodiment
Because in the communication environment of reality, the frame of UE is not that each subframe all can change regularly, therefore downlink synchronization tracking does not need each subframe all to adjust and upgrades frame position regularly, and only need adjust a frame timing position every the regular hour just can guarantee systematic function.Such as 60 subframes (300ms), adjust to upgrade a frame timing position, the UE frame that can follow the tracks of the 1/8chip precision under the application scenarios of 350km/h (km/hour) regularly changes.So, if do downlink synchronization tracking, only need a timing of per 60 subframes output adjustment amount with SYNC-DL sign indicating number sequence, upgrade one time the frame timing position, just can guarantee the performance of the downlink synchronization tracking of 1/8chip precision.
Basic ideas of the present invention are, if current system does not carry out line trace under the Midamble sign indicating number, then the cycle of line trace is set to down the line trace basic cycle under the SYNC-DL sign indicating number, for example, 60 subframes, and current system is being when carrying out under the Midamble sign indicating number line trace, can the SYNC-DL sign indicating number under cycle of line trace be set to down the integral multiple of line trace basic cycle.
Describe the present invention below in conjunction with drawings and Examples.
Line trace execution cycle schematic diagram under SYNC-DL sign indicating number when Fig. 1 does not carry out line trace under the Midamble sign indicating number for current system.
Line trace execution cycle schematic diagram under SYNC-DL sign indicating number when Fig. 2 is carrying out line trace under the Midamble sign indicating number for current system.
As shown in Figure 2, when joint-detection demodulation business time-slot, line trace can move always under the Midamble sign indicating number, carries out the output of an adjustment amount every PeriodMidamble=60 subframe, and adjustment amount is then periodically exported in line trace under the SYNC-DL sign indicating number.
Fig. 3 is an embodiment of the invention TD-SCDMA system descending method for synchronized flow chart.As shown in Figure 3, downlink synchronization tracking comprises following steps:
101: adjust the descending tracking cycle PeriodSYNC of SYNC-DL sign indicating number, promptly judge: the current joint-detection demodulation business time-slot that whether carrying out,
If not, then make PeriodSYNC=PeriodADJ;
If then make PeriodSYNC=N * PeriodADJ;
PeriodADJ is the following line trace basic cycle, and this value is relevant with the maximum rate travel V of target, when target maximum rate travel V=350km/h that system need support, and PeriodADJ=60 (subframe).
N is the descending tracking cycle multiple of SYNC-DL sign indicating number, and when joint-detection demodulation business time-slot, in the time of promptly can using under the Midamble sign indicating number line trace, the N that the descending tracking cycle of SYNC-DL sign indicating number can be made as down the line trace basic cycle doubly; Otherwise the descending tracking cycle of SYNC-DL sign indicating number equals the following line trace basic cycle.The purpose of doing like this is to reduce the power consumption of UE.
Above-mentioned N value need be set according to system emulation or field testing, under the prerequisite that satisfies system communication performance requirement (for example, Block Error Rate can satisfy system requirements), selects to make the UE power consumption to reach minimum N value.
For example, N is set to 8, PeriodADJ=60, and then PeriodSYNC is 480 subframes, i.e. 1200ms so.
102: make sub-frame count SubFrameCnt=SubFrameCnt+1;
103: judge whether to start line trace under the SYNC-DL sign indicating number:, carry out next step, otherwise jump to step 102 if SubFrameCnt 〉=PeriodSYNC then makes SubFrameCnt=0 by sub-frame count SubFrameCnt value;
When carrying out, above-mentioned steps 103 also needs execution in step 113;
104: make count value m=m+1;
The initial value of above-mentioned m is 0.
105: receive current subframe comprise SYNC-DL sign indicating number sequence this in interior front and back 32 chips data of totally 128 chips;
106: the SYNC-DL sign indicating number sequence with 64 chips of the data of above-mentioned 128 chips and this locality (being UE) carries out related calculation, and obtains 64 DP (Delay profile, time delay function) value:
Wherein, r (k) is the IQ data segment of SYNC-DL sign indicating number part, k=i+l=1～128;
Sync (l) is the SYNC-DL sign indicating number sequence of sub-district, and length is 64 chips;
Conj () grips function altogether;
I is DP call number i=1～64 of sub-district; J is an imaginary unit.
107: in order to reduce The noise, obtain stable frame regularly, can average with each DP (i) value of continuous a plurality of subframes, obtain each DP (i) of current subframe average AveDP (m, i);
A kind of average method of calculating commonly used is to adopt IIR (Infinite Impulse Response, infinite impulse response) filter coefficient to calculate the weighted average of each AveDP (i) as weights:
During m=1: AveDP (m, i)=DP (m, i);
M＞1 o'clock: AveDP (m, i)=α * AveDP (m-1, i)+(1-α) * DP (m, i);
α is configurable filter coefficient, 0≤α≤1.
108: judge the value of m, if m 〉=MCnt then carries out next step; Otherwise jump to step 104;
MCnt is when carrying out under SYNC-DL sign indicating number line trace, for obtaining the number of the required continuous subframes of each DP (i) average; This value need be set according to system emulation or field testing, under the prerequisite that satisfies system communication performance requirement (for example, Block Error Rate can satisfy system requirements), selects minimum MCnt value.For example, MCnt can get 4.
109: make AveDP (i)=AveDP (m, i); Make m=0;
110: in order to obtain more accurate frame regularly, the AveDP sequence that each AveDP (i) forms is carried out 4 times of interpolations, obtain AveDP ' (j), j=1,2 ..., 256; Obtaining precision is the AveDP sequence of 1/4 chip;
In be inserted with the method for a lot of maturations, do not give unnecessary details here.
111: above-mentioned each AveDP ' (j) is compared with the time delay function threshold value of setting, the deletion adjacent multi-path, keep surpass thresholding AveDP ' (j); The position that surpasses article one footpath of thresholding promptly is frame timing position TP_SYNC;
The calculating of above-mentioned time delay function threshold value can be adopted and commonly used multiply by one greater than 1 coefficient or multiply by a time delay function threshold algorithm computation less than 1 coefficient based on maximum and obtain based on noise level.
112: above-mentioned frame timing position and SYNC ideal frame timing position TimingTarget_SYNC are compared, obtain SYNC adjustment amount (unit is a chip), and it is kept among the register REG_SYNC:
ΔSYNC＝TP_SYNC-TimingTarget_SYNC；
In order to keep stability, can set and adjust step-length step, as the step=1/4 chip, obtain the SYNC adjustment amount of adjusting through step-length (unit is a chip):
ΔSYNC＝sign(TP_SYNC-TimingTarget_SYNC)×1/4
Wherein sign (x) is a sign function, and x was greater than 0 o'clock sign (x)=1, and x equals 0 o'clock sign (x)=0, and x was less than 0 o'clock sign (x)=-1.
113: judge whether joint-detection starts (promptly judging the current joint-detection demodulation business time-slot that whether carrying out), if execution in step 114, otherwise execution in step 119;
114: obtain channel estimation value h on the Midamble sign indicating number by the Steiner channel estimator of joint-detection, the precision of this value is 1 chip;
115: in order to reduce The noise, obtain stable timing and multipath, adopt and above-mentioned steps 107 similar methods, with the h of continuous a plurality of subframes or | h|
2Value averages, obtain h or | h|
2Mean value, represent with AveH;
116: in order to obtain higher timing accuracy, the channel estimation value of chip precision need be carried out 8 times of interpolations, obtain 1/8chip accuracy A veH_Interplolation sequence;
In be inserted with the method for a lot of maturations, do not give unnecessary details here.
117: the channel estimating threshold value of above-mentioned AveH_Interplolation sequence and setting is compared, and the deletion adjacent multi-path, keep the AveH_Interplolation value that surpasses thresholding; Article one footpath that surpasses the channel estimating threshold value promptly is accurate Midamble frame timing position TP_Midamble;
The calculating of above-mentioned channel estimating threshold value can be adopted and commonly used multiply by one greater than 1 coefficient or multiply by a time delay function threshold algorithm computation less than 1 coefficient based on maximum and obtain based on noise level.
118: above-mentioned frame timing position and Midamble ideal frame timing position TimingTarget_Midamble are compared, obtain the Midamble adjustment amount, and it is kept among the register REG_Midamble:
ΔMidamble＝TP_Midamble-TimingTarget_Midamble；
In order to keep the stable of timing and multipath, can set the step-length step of each adjustment, as the step=1/8 chip, obtain the SYNC adjustment amount of adjusting through step-length (unit is a chip):
ΔMidamble＝sign(TP_Midamble-TimingTarget_Midamble)×1/8
Wherein, above-mentioned Midamble ideal frame timing position TimingTarget_ Midamble is set at following value:
In the following formula, W is the channel estimating window width, and ceil () is the function that rounds up.
119: obtain comprehensive adjustment magnitude Δ according to above-mentioned Δ SYNC:
If do not have available Midamble sign indicating number adjustment magnitude, then adjustment amount Δ=Δ SYNC;
If do not have available SYNC adjustment magnitude, then adjustment amount Δ=Δ Midamble;
If available SYNC adjustment magnitude is arranged, available Midamble sign indicating number adjustment magnitude is also arranged, then adjustment amount Δ=β * Δ SYNC+ (1-β) * Δ Midamble;
The span of above-mentioned weight coefficient β is: 0＜β＜1; This value is set according to system emulation or field testing.
Above-mentioned steps 104～112 and step 113～118th, executed in parallel.
Above embodiment is to be the cycle to carry out line trace under the SYNC sign indicating number with PeriodADJ+4 or N * PeriodADJ+4 frame, also can be defined as other value greater than PeriodADJ this cycle.
As from the foregoing, the present invention is by when joint-detection starts, and when carrying out under the Midamble sign indicating number line trace, carries out line trace under the SYNC sign indicating number with the cycle greater than PeriodADJ; In the time can't carrying out under the Midamble sign indicating number line trace, be the cycle to carry out line trace under the SYNC sign indicating number with PeriodADJ; With the weighted average of two kinds of methods as final adjustment amount.
Claims (7)
1. downlink synchronization tracking method of time-division synchronization CDMA access system, it is characterized in that, terminal is carried out SYNC downlink synchronization tracking based on the SYNC-DL sign indicating number sequence in the descending pilot frequency time slot with the descending tracking cycle of setting of SYNC-DL sign indicating number, obtains regularly adjustment amount of SYNC; If current have a regularly adjustment amount of available Midamble based on business time-slot Midamble sign indicating number channel estimating, then itself and above-mentioned SYNC timing adjustment amount are weighted on average, the timing adjustment amount of this weighted average as described downlink synchronization tracking.
2. downlink synchronization tracking method of time-division synchronization CDMA access system as claimed in claim 1 is characterized in that, described weighted average adopts following formula to calculate:
Δ＝β×ΔSYNC+(1-β)×ΔMidamble；
Wherein, Δ is the timing adjustment amount of described downlink synchronization tracking, and Δ SYNC is a regularly adjustment amount of described SYNC, and Δ Midamble is a regularly adjustment amount of described Midamble;
β is a weight coefficient, 0＜β＜1.
3. downlink synchronization tracking method of time-division synchronization CDMA access system as claimed in claim 2 is characterized in that, described β value is set according to system emulation or field testing.
4. downlink synchronization tracking method of time-division synchronization CDMA access system as claimed in claim 1, it is characterized in that, if current no available described Midamble is adjustment amount regularly, then with the timing adjustment amount of described SYNC timing adjustment amount as described downlink synchronization tracking.
5. downlink synchronization tracking method of time-division synchronization CDMA access system as claimed in claim 1 is characterized in that, if system does not have the demodulation business time-slot, the descending tracking cycle of then described SYNC-DL sign indicating number is the following line trace basic cycle; Otherwise the descending tracking cycle of described SYNC-DL sign indicating number is set to down N times of line trace basic cycle, and N is an integer, N＞1.
6. downlink synchronization tracking method of time-division synchronization CDMA access system as claimed in claim 5, it is characterized in that, described N value is set according to system emulation or field testing, and under the prerequisite that satisfies the system communication performance requirement, selection can make described power consumption of terminal reach minimum N value.
7. downlink synchronization tracking method of time-division synchronization CDMA access system as claimed in claim 5, it is characterized in that, when system is carrying out joint-detection demodulation business time-slot, with the described Midamble timing adjustment amount of described output of following line trace basic cycle based on business time-slot Midamble sign indicating number channel estimating.
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| CN101615922B (en) * | 2008-06-24 | 2012-12-05 | 中兴通讯股份有限公司 | Downlink synchronous tracking method and downlink synchronous tracking device |
| CN101714889B (en) * | 2008-10-07 | 2013-02-06 | 联芯科技有限公司 | Method and device for improving accuracy rate of downlink pilot frequency time slot search |
| CN101714890B (en) * | 2008-10-07 | 2013-05-29 | 联芯科技有限公司 | Method and device for improving searching accuracy of SYNC code by two-frame data |
| CN101753167B (en) * | 2008-11-28 | 2013-06-05 | 中兴通讯股份有限公司 | Synchronous tracking and adjacent subdistrict distance measuring method and system |
| CN103841609B (en) * | 2012-11-27 | 2018-09-11 | 中兴通讯股份有限公司 | Downlink synchronization tracking method and device when TD-SCDMA switches |
| CN114244464B (en) * | 2021-11-16 | 2022-12-09 | 中国科学院上海微系统与信息技术研究所 | Synchronization method of multi-hop mobile ad hoc network |
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| EP1148751A1 (en) * | 2000-04-19 | 2001-10-24 | Siemens Aktiengesellschaft | Method for signalling of the base station identifier code |
| CN1553586A (en) * | 2003-12-19 | 2004-12-08 | 大唐移动通信设备有限公司 | Descending synchronous calibrating method and apparatus for TD-SCDMA system |
| CN1925364A (en) * | 2006-09-15 | 2007-03-07 | 北京北方烽火科技有限公司 | Frequency synchronization method for TD-SCDMA system and device using this method |
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| EP1148751A1 (en) * | 2000-04-19 | 2001-10-24 | Siemens Aktiengesellschaft | Method for signalling of the base station identifier code |
| CN1553586A (en) * | 2003-12-19 | 2004-12-08 | 大唐移动通信设备有限公司 | Descending synchronous calibrating method and apparatus for TD-SCDMA system |
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