CN104254100A - Uplink timing advance measuring method - Google Patents
Uplink timing advance measuring method Download PDFInfo
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- CN104254100A CN104254100A CN201310254588.9A CN201310254588A CN104254100A CN 104254100 A CN104254100 A CN 104254100A CN 201310254588 A CN201310254588 A CN 201310254588A CN 104254100 A CN104254100 A CN 104254100A
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Abstract
The invention discloses an uplink timing advance (TA) measuring method. The method comprises steps that: A, frequency domain channel estimation is carried out, and inverse fast Fourier transform on the frequency domain channel estimation result is carried out to a time domain; B, front 1-NCP sampling points in frequency domain channel estimation are taken as a first detection window, back m sampling points are taken as a second detection window, the first detection window and the second detection window are merged as a third detection window, wherein the m is smaller than or equal to the natural number NCP, and the NCP is the cyclic prefix sampling point number; C, the peak value position of channel impulse response in the third detection window is searched, peak value positions in one TA adjustment period are averaged to acquire peak value position information after smoothing, the information is recorded as Peak, a peak value location P-real of real reception signals is determined, P-real=Peak-Ncp-1; and D, a difference value between the estimated peak value location and a target value is computed, and adjustment on the TA value is carried out according to the difference value. Through the method, a base station can not only estimate the TA value of UE delay sending, but also can estimate the TA value of UE in-advance sending.
Description
Technical field
The application relates to wireless communication technology field, particularly relates to a kind of method of measurement of uplink timing advance.
Background technology
In wireless communication system, in order to ensure the orthogonality of upward signal between different user devices (UE), control UE is needed to adopt different uplink timing advances (TA:Timing Advance) to send signal, namely the UE that distance base station (eNB) is far away comparatively early sends, and the more late transmission of the UE of distance eNB close together, the receive clock finally making each UE signal arrive receiver is consistent.ENB indicates UE to adopt the size of TA value by sending uplink clock control signal.
Usually, if UE does not send signal for a long time, need to carry out TA estimation recovery uplink synchronous, after initial synchronisation is set up by sending random access leader sequence, remain synchronous by other uplink reference signals again, and then ensure the complete and continuous of communication process.
At present, 3GPP(3
rdgeneration Partnership Project) a related protocol regulation UE how to report TA value and eNB end how to use this value to adjust, and the circular of TA value is realized by each manufacturer, current published document (Chen Yu, Wen Xiangming, Zheng Wei, " a kind of based on LTE TDD system uplink synchronous control algolithm ", electronics and information journal, in August, 2010) in, the computational methods of TA value are studied.The method utilizes the estimation of the channel impulse response original position of user, peak and end position, and the uplink synchronous of carrying out this user controls.The method comprises inner ring Synchronization Control and outer shroud Synchronization Control two parts.Inner ring Synchronization Control is according to main footpath, and the position in first footpath and tail footpath, exports TA value when satisfying condition, i.e. timing adjustment values.Outer shroud Synchronization Control is mainly used to adjustment aim TA value.
TA method of measurement flow process of the prior art as shown in Figure 1, comprising:
Step 101: carry out channel estimation in frequency domain, carries out 256 inverse fast fourier transform (IFFT) to channel estimation in frequency domain result and transforms to time domain;
Step 102: the front 1 ~ N getting channel estimation in frequency domain
cPindividual sampled point is as detection window;
Step 103: the main path position (position that detection window self-energy is the strongest) determining channel impulse response in detection window, first path position (10% position occurred of first most powerful path energy), and tail path position (10% position occurred of last most powerful path energy), and the position in a TA adjustment cycle is averaged, obtain the positional information smoothly, be respectively main footpath Peak, first footpath Start, tail footpath End.
During step 104:TA adjustment, calculate the difference between peak and desired value (Target) estimated, adjust according to difference, adjustment step-length is a TA value (16Ts), represents with δ.Wherein Ts is the time-domain sampling unit of LTE system definition, 1Ts=1/ (15000*2048) second
Δ＝Target-Peak
IfΔ＜-TA/2&&Start＞TA
δ＝TA
IfΔ＞TA/2&&End＜Ncp-TA
δ＝-TA
Else
δ＝0
Step 105: export TA adjusted value δ.
TA computational methods disclosed in above-mentioned document are also current main flow implementation methods, but the method is when applying, and there are the following problems:
Current TA computational methods adjust TA value when next UE sends according to the difference between the peak of channel estimating and preset value, but the method can only estimate that UE postpones TA value when sending with target peak, and TA value when correctly cannot estimate that UE sends with target peak in advance, this can cause because UE sends in advance, and eNB windows, position relatively lags behind, the partial information of next OFDM symbol is included in the time of reception of current sign, and this will cause larger intersymbol interference.
Summary of the invention
This application provides a kind of method of measurement of uplink timing advance, TA value base station can not only being estimated when UE delays transmission, also can estimate TA value when UE sends in advance.
The method of measurement of a kind of uplink timing advance TA that the embodiment of the present application provides, comprising:
A, carry out channel estimation in frequency domain, inverse fast fourier transform is carried out to time domain to channel estimation in frequency domain result;
B, get the front 1 ~ N of channel estimation in frequency domain
cPindividual sampled point is as the first detection window, and described first detection window and the second detection window, as the second detection window, merge, as the 3rd detection window by a rear m sampled point; Wherein, m is for being less than or equal to N
cPnatural number; N
cPit is cyclic prefix samples point number;
The peak of channel impulse response in C, search the 3rd detection window, and the peak in a TA adjustment cycle is averaged, obtain the peak-location information smoothly, be designated as Peak, and determine the peak value position P_real in actual Received signal strength, P_real=Peak-Ncp-1;
Difference between the peak that D, calculating estimate and desired value, adjusts TA value according to difference.
Preferably, described inverse fast fourier transform is 256 inverse fast fourier transforms.
Preferably, the value of described m is 1/3 × N
cP.
Preferably, step D comprises: set the difference between peak and desired value that estimates as Δ, if Δ <-TA/2, then TA adjusted value is a positive step-length, if Δ >TA/2, then TA adjusted value is a negative step-length, if-TA/2< Δ <TA/2, then TA adjusted value is zero.
Preferably, described step-length is 16Ts.
As can be seen from the above technical solutions, the application redesigns detection window, no matter UE sends in advance or delays transmission, can the peak of channel response be included in detection window, to determine timing position more exactly, estimate the Timing Advance needing adjustment, its principle is as follows: eNB receives the continuous radio frame signal from same UE, if cause the first detection window not comprise channel response peak information because UE sends too early, in the second detection window, the channel response peak information in the original position of next subframe can be included; If UE delays to reach, in the first detection window, then can comprise channel response peak information, in the second detection window, then there is no corresponding information.Thus, the first detection window and the second detection window are merged the channel information that can both can comprise when UE arrives in advance in the 3rd detection window obtained by the application, also can comprise channel information when UE delays to reach.3rd detection window can find out channel response peak preferably, and then can estimate Timing Advance comparatively accurately.
Accompanying drawing explanation
Fig. 1 is TA method of measurement schematic flow sheet of the prior art;
Fig. 2 is that time domain timing method of the prior art delays detection schematic diagram of windowing;
The time domain timing method that Fig. 3 provides for the embodiment of the present application delays detection schematic diagram of windowing;
The TA method of measurement schematic flow sheet that Fig. 4 provides for the embodiment of the present application.
Embodiment
The application has done improvement for current up timing estimation algorithms Problems existing, a kind of new TA method of measurement is proposed, TA value base station can not only being estimated when UE delays transmission, also can estimate TA value when UE sends in advance, and then not affect data demodulation process below.
For making the know-why of technical scheme, feature and technique effect clearly, below in conjunction with specific embodiment, technical scheme is described in detail.
The technical essential of the TA method of measurement that the embodiment of the present application provides comprises:
(1) base station end observation window scope is expanded, one is received the rear N of data length
cPindividual sampled point also includes observation scope in.As shown in Figure 3, detection window 2 and detection window 1 are merged into a large detection window;
(2) in this observation window, find the peak of channel response, then compare with target peak position, determine timing adjustment amount;
(3) less owing to delaying probability of happening of windowing, and delay the amount of windowing and be generally also no more than 1/3*N
cP, thus, according to the needs of implementation complexity, adjustment detection window size can be considered, such as, detection window 2 reduced hunting zone to 1/3 × N
cP.
Wherein, N
cPit is the cyclic prefix samples point number specified in 3GPP36.211.
The TA method of measurement flow process that the embodiment of the present application provides as shown in Figure 4, comprises the steps:
Step 401: carry out channel estimation in frequency domain, carries out 256 inverse fast fourier transform (IFFT) to channel estimation in frequency domain result and transforms to time domain.
Step 402: the front 1 ~ N getting channel estimation in frequency domain
cPindividual sampled point is as detection window 1, and two detection window, as detection window 2, merge, as new detection window by a rear m sampled point.Wherein, m is for being less than or equal to N
cPnatural number.In the embodiment of the present application, the value of m is 1/3 × N
cP.
Step 403: the peak of channel impulse response in searching and detecting window, and the peak in a TA adjustment cycle is averaged, obtain the peak-location information smoothly, be designated as Peak, and determine the peak value position P_real in actual Received signal strength, P_real=Peak-Ncp-1
If P_real>0, represent OFDM symbol peak to be detected normally windowing in position, now signal delays transmission, windows position in advance;
If P_real<0, represent OFDM symbol peak to be detected not normally windowing in position, now signal sends in advance, windows position rearward.
Step 404: calculate the difference between peak and desired value estimated, adjust according to difference to TA value, adjustment step-length is a TA value (16Ts), represents with δ.If Δ <-TA/2, then TA adjusted value is a positive TA value, if Δ >TA/2, then TA adjusted value is a negative TA value, if-TA/2< Δ <TA/2, then TA adjusted value is zero:
Δ＝Target-P_real
IfΔ＜-TA/2
δ＝TA
IfΔ＞TA/2
δ＝-TA
Else
δ＝0
Step 405: export TA adjusted value δ.
The TA method of measurement that the application provides can estimate the peak of channel response more accurately, and wherein, the large I of detection window 2 reduces according to the actual requirements, to reduce the complexity of realization.Technical scheme is not only applicable to LTE system, is also applicable to the communication system needing to calculate TA value that other are similar.
The foregoing is only the preferred embodiment of the application; not in order to limit the protection range of the application; within all spirit in technical scheme and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.
Claims (5)
1. a method of measurement of uplink timing advance TA, is characterized in that, comprising:
A, carry out channel estimation in frequency domain, inverse fast fourier transform is carried out to time domain to channel estimation in frequency domain result;
B, get the front 1 ~ N of channel estimation in frequency domain
cPindividual sampled point is as the first detection window, and described first detection window and the second detection window, as the second detection window, merge, as the 3rd detection window by a rear m sampled point; Wherein, m is for being less than or equal to N
cPnatural number; N
cPit is cyclic prefix samples point number;
The peak of channel impulse response in C, search the 3rd detection window, and the peak in a TA adjustment cycle is averaged, obtain the peak-location information smoothly, be designated as Peak, and determine the peak value position P_real in actual Received signal strength, P_real=Peak-Ncp-1;
Difference between the peak that D, calculating estimate and desired value, adjusts TA value according to difference.
2. method according to claim 1, is characterized in that, described inverse fast fourier transform is 256 inverse fast fourier transforms.
3. method according to claim 1, is characterized in that, the value of described m is 1/3 × N
cP.
4. method according to claim 1, it is characterized in that, step D comprises: set the difference between peak and desired value that estimates as Δ, if Δ <-TA/2, then TA adjusted value is a positive step-length, if Δ >TA/2, then TA adjusted value is a negative step-length, if-TA/2< Δ <TA/2, then TA adjusted value is zero.
5. method according to claim 4, is characterized in that, described step-length is 16Ts.
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| WO2016184155A1 (en) * | 2015-05-21 | 2016-11-24 | 中兴通讯股份有限公司 | Method of processing timing offset and device utilizing same |
| CN106376051A (en) * | 2016-08-26 | 2017-02-01 | 上海斐讯数据通信技术有限公司 | Network device and data sending method |
| CN108124307A (en) * | 2016-11-30 | 2018-06-05 | 联发科技股份有限公司 | Communicator and its performance enhancement |
| CN110493820A (en) * | 2019-09-24 | 2019-11-22 | 辰芯科技有限公司 | A kind of propagation delay time appraisal procedure, device, communication node and storage medium |
| CN110881215A (en) * | 2019-11-20 | 2020-03-13 | 重庆邮电大学 | Five-window combined timing advance estimation calibration method and system thereof |
| CN113853827A (en) * | 2019-05-13 | 2021-12-28 | 松下电器（美国）知识产权公司 | Transmission device, reception device, transmission method, and reception method |
| CN116528271A (en) * | 2023-06-28 | 2023-08-01 | 极芯通讯技术(南京)有限公司 | Method for adaptively adjusting physical random access channel detection window and related equipment thereof |
| WO2023178998A1 (en) * | 2022-03-21 | 2023-09-28 | 大唐移动通信设备有限公司 | Ta estimation method, network device, apparatus, and storage medium |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016184155A1 (en) * | 2015-05-21 | 2016-11-24 | 中兴通讯股份有限公司 | Method of processing timing offset and device utilizing same |
| CN106376051A (en) * | 2016-08-26 | 2017-02-01 | 上海斐讯数据通信技术有限公司 | Network device and data sending method |
| CN106376051B (en) * | 2016-08-26 | 2020-03-13 | 上海斐讯数据通信技术有限公司 | Network equipment and data sending method |
| CN108124307A (en) * | 2016-11-30 | 2018-06-05 | 联发科技股份有限公司 | Communicator and its performance enhancement |
| CN113853827A (en) * | 2019-05-13 | 2021-12-28 | 松下电器（美国）知识产权公司 | Transmission device, reception device, transmission method, and reception method |
| CN113853827B (en) * | 2019-05-13 | 2024-04-30 | 松下电器（美国）知识产权公司 | Transmitting apparatus, receiving apparatus, transmitting method, and receiving method |
| CN110493820A (en) * | 2019-09-24 | 2019-11-22 | 辰芯科技有限公司 | A kind of propagation delay time appraisal procedure, device, communication node and storage medium |
| CN110881215A (en) * | 2019-11-20 | 2020-03-13 | 重庆邮电大学 | Five-window combined timing advance estimation calibration method and system thereof |
| WO2023178998A1 (en) * | 2022-03-21 | 2023-09-28 | 大唐移动通信设备有限公司 | Ta estimation method, network device, apparatus, and storage medium |
| CN116528271A (en) * | 2023-06-28 | 2023-08-01 | 极芯通讯技术(南京)有限公司 | Method for adaptively adjusting physical random access channel detection window and related equipment thereof |
| CN116528271B (en) * | 2023-06-28 | 2023-08-29 | 极芯通讯技术(南京)有限公司 | Method for adaptively adjusting physical random access channel detection window and related equipment thereof |
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