CN104640195A - Data transmission method - Google Patents
Data transmission method Download PDFInfo
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- CN104640195A CN104640195A CN201310571111.3A CN201310571111A CN104640195A CN 104640195 A CN104640195 A CN 104640195A CN 201310571111 A CN201310571111 A CN 201310571111A CN 104640195 A CN104640195 A CN 104640195A
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- data
- taguard
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- prach
- timing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Disclosed is a data transmission method. The data transmission method includes that a base station eNB receives data ahead of A sample points; after subjecting all the received data to medium radio frequency processing, the eNB estimates timing offset of received PRACH (physical random access channel) data to be Nta_PRACH; UE's first timing initial lead is determined according to the Nta_PRACH and a predetermined numerical value TAGuard set in a system, and the eNB transmits the UE's first timing initial lead to UE; the UE transmits the data according to the first timing initial lead; TAGuard point data transit is performed on other physical channels to compensate timing offset caused by the fact that the base station eNB receives the data ahead of TAGuard sample points; timing estimation is performed through uplink pilot signals, timing offset between the eNB and the UE is estimated, and second timing initial lead is calculated and is updated continuously. After the data transmission method is applied, the eNB can avoid intersymbol interference and achieve minimizing of the timing offset.
Description
Technical field
The application relates to communication technical field, more specifically, relates to a kind of method transmitting data.
Background technology
In LTE system, after user (UE) receiver is synchronous with base station (eNB), eNB estimates initial timing lead (TA) by random access procedure, and eNB issues initial TA value to UE.The initial TA that UE is issued by setting eNB, adjustment data arrive the moment of eNB.After this, eNB needs to estimate TA by pilot frequency sequence, and constantly upgrades TA value, and issues this value, makes UE adjust the time sending data, reaches the object with eNB time synchronized.
ENB receives the targeting sequencing of UE.Be correlated with by targeting sequencing and local sequence, according to correlation peak with without the difference calculation delay of the target peak position in timing offset situation, the distance generation of this time delay mainly UE and eNB, be denoted as TimingEsti, evaluated error is denoted as ± Δ T.
Existing technical scheme is, by initial timing, eNB first estimates that TimingEsti, UE are after compensate for the timing offset TimingEsti of UE and eNB due to distance generation, then allow UE time delay send a system predetermined value TAGuard.If initial TimingEsti is less than predetermined value TAGuard, then do not adjust the Timing Advance of UE; The intersymbol interference that prior art can be avoided UE to arrive eNB in advance and cause.When predetermined value TAGuard is more than or equal to the evaluated error of TimingEsti, i.e. TAGuard >=Δ T, can ensure that the data that UE sends can delay TAGuard arrival eNB again, this avoid the intersymbol interference of OFDM symbol.
Because prior art is accurately determining on the basis of TimingEsti, then allow the time delay of a UE delayed delivery TAGuard, although avoid the intersymbol interference brought due to timing estimation error, but still there is timing offset.Be equivalent to there is individual phase rotating between the subcarrier of the N point OFDM symbol of accurate timing, utilize channel estimating and equilibrium can eliminate this phase rotating to a certain extent and bring change.Due to the imperfection of channel estimating, under high code check high modulation mode, performance is slightly lost.And the channel having code to divide in LTE system upward signal, as PUCCH, SRS etc., these channels when there being timing offset, the orthogonality of orthogonal code along with the change of timing offset large and be deteriorated, performance loss is larger.
Summary of the invention
The embodiment of the present invention proposes a kind of method transmitting data, and eNB can either avoid the intersymbol interference of the reception data that may cause due to timing estimation error, can realize minimizing of timing error again.
The technical scheme of the embodiment of the present invention is as follows:
Transmit a method for data, described method comprises:
Base station eNB shifts to an earlier date A sampling point and receives data;
After penetrating intermediate frequency process to all reception data, eNB estimates that the timing offset of the Physical Random Access Channel PRACH data received is Nta_PRACH;
By the first Timing Advance setting predetermined value TAGuard in Nta_PRACH and system and determine UE;
UE sends data according to the first Timing Advance.
Described eNB shifts to an earlier date A sampling point reception data and comprises:
Measure and set predetermined value TAGuard in system the pre-set time of hardware acceptance data window and determine A;
ENB shifts to an earlier date A sampling point and receives data.
With TAGuard, amount pre-set time of hardware acceptance data window determines that A comprises:
(amount+TAGuard pre-set time of hardware acceptance data window) * Ts=A, Ts is the sampling period.
Describedly determine that first Timing Advance of UE comprises by Nta_PRACH and TAGuard:
Nta_PRACH is greater than TAGuard, Nta_PRACH – TAGuard=first Timing Advance.
Describedly determine that first Timing Advance of UE comprises by Nta_PRACH and TAGuard: Nta_PRACH is less than or equal to TAGuard, and the first Timing Advance equals zero.
Described method comprises further:
Reception data for non-PRACH are removed after cyclic prefix CP, by last to orthogonal frequency division multiplex OFDM symbol of the data-moving of a front TAGuard sampling point, then do fast Fourier FFT process;
ENB does channel estimating to the data after FFT process, the position of the impulse response peak value of channel estimating with accurately arrive the alternate position spike of the channel estimating peak of eNB for estimate timing offset;
The second Timing Advance is calculated according to estimation timing offset;
UE sends data according to the second Timing Advance, and eNB calculates described alternate position spike again.
As can be seen from technique scheme, eNB shifts to an earlier date A sampling point reception data in embodiments of the present invention; After penetrating intermediate frequency process to all reception data, eNB estimates that the timing offset of the PRACH data received is Nta_PRACH; By the first Timing Advance setting predetermined value TAGuard in Nta_PRACH and system and determine UE; UE sends data according to the first Timing Advance.ENB receive advance data can reduce the intersymbol interference that timing offset causes.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram of transmission data.
Embodiment
Express clearly clear for making the object, technical solutions and advantages of the present invention, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, first when transmitting PRACH channel data, determine the first Timing Advance, UE sends data according to the first Timing Advance.ENB receive advance data can avoid intersymbol interference.
In addition, in the non-PRACH channel data process of reception, then first moving data determines the second Timing Advance, and periodically updates the second Timing Advance.The receive advance TAGuard of eNB setting samples, and in order to guarantee the timing offset compensated because eNB receive advance brings, thus reaches the minimized object of timing offset.
See the method flow schematic diagram that accompanying drawing 1 is transmission data, specifically comprise the following steps:
101, eNB shifts to an earlier date A sampling point reception data.
Specify in LTE system, UE sends up-link wireless frame i can (N more Zao than corresponding descending sub frame
tA+ N
tAoffset) × Ts.Wherein Ts is sampling time unit, N
tAoffsetfor amount pre-set time of hardware acceptance data window in the real system of regulation, N
tAit is the time delay estimated value that the distance between UE and eNB produces.N
tAidentical with TimingEsti of the prior art.
N
tAoffsetdetermine A with the predetermined value TAGuard set in eNB, eNB shifts to an earlier date A sampling point and receives data.The eNB receive advance time is (N
tAoffset+ TAGuard) × Ts, i.e. A=(N
tAoffset+ TAGuard) × Ts.TAGuard × Ts is the predetermined time of opening reception data window in advance, and the register preset value being about to compensate hardware acceptance time delay reduces TAGuard.
Shift to an earlier date A sampling point by eNB to receive, wherein N
tAoffsetindividual sampling point is the value that agreement specifies, and the introducing of TAGuard compensates the timing offset that timing estimation error brings, and avoids the intersymbol interference caused when arriving eNB in advance.That the time delay error of hardware can also be avoided in addition to cause may delay reception condition.
102, the first Timing Advance is determined.
ENB receiver is after penetrating intermediate frequency process, and the estimation of deviation that the PRACH channel that estimation receives does initial timing is Nta_PRACH(Ts), the time delay estimated value that the distance between UE and eNB produces is expressed as N
tA, i.e. the first Timing Advance.Due to N
tAoffsetbe the number of samples that in agreement, regulation UE sends in advance, eNB also correspondingly shifts to an earlier date N simultaneously
tAoffsetsampling point receives, then this value can not cause the delay inequality between UE and eNB, can not embody the impact of this value in Nta_PRACH.
Because TAGuard is the extra receive advance data time that eNB introduces, this value can be included in the time Yanzhong of estimation, and their relation is Nta_PRACH=(N
tA+ TAGuard) Ts, and UE needs the time delay of adjustment to be the time delay N that the distance between UE and eNB produces
tA, therefore have N
tA=(Nta_PRACH-TAGuard) × Ts.Owing to specifying in agreement that the TA issued is in units of 16Ts, so need N
tAbe scaled in units of Ts, then be issued to UE.UE is according to N
tAsend data.
Owing to specifying N in agreement
tAbe more than or equal to zero, if so Nta_PRACH is greater than TAGuard, then have Nta_PRACH – TAGuard=N
tA.Otherwise the first Timing Advance equals zero.
103, the second Timing Advance is determined.
The reception data of non-PRACH channel remove CP, by last to OFDM symbol of the data-moving of a front TAGuard sampling point, do fast Fourier (FFT) and process.Do the data-moving of TAGuard point, extra TAGuard the sampling point introduced in advance to compensate base station eNB receives the timing offset that data are brought.
Data-moving only moves GuardTA sampling point, because A is (amount+TAGuard pre-set time of hardware acceptance data window) * Ts.And amount pre-set time of hardware acceptance data window, be that UE and eNB uses, UE will shift to an earlier date, and " amount pre-set time of the hardware acceptance data window " time sends, and eNB also shifts to an earlier date, and " amount pre-set time of the hardware acceptance data window " time receives.Therefore, the relative eNB of UE is advanced by TAGuard sampling point, needs last to OFDM symbol of the data-moving of a front TAGuard sampling point.
Concrete can pass through circulating register, TAGuard+1 sampling point is received sampling point as first and reads, finally read TAGuard sampling point above again.Compensate for the timing offset that receive advance brings like this, then do the operations such as FFT.
The data of FFT process comprise pilot signal or the interception reference signal of Traffic Channel.Channel estimating is done to the data after FFT process.The position of the impulse response peak value of channel estimating with accurately arrives the alternate position spike of the channel estimating peak of eNB for estimate timing offset, target is that to adjust estimation timing differentials be 0.The second Timing Advance is conventionally calculated according to estimation timing offset.When UE sends data again, then send according to the second Timing Advance.Then the second Timing Advance is periodically updated, so that the delay inequality between real-Time Compensation UE and eNB.
Due in the transmitting procedure of data, first carry out the transmission of PRACH channel data, then carry out the transmission of non-PRACH channel data.Wherein, the transmission of non-PRACH channel data comprises repeatedly, so in the transmitting procedure of non-PRACH channel data repeatedly, upgrades the second Timing Advance.UE transmits non-PRACH channel data according to the second Timing Advance, the timing offset that the change compensating eNB and UE transmission range brings.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. transmit a method for data, it is characterized in that, described method comprises:
Base station eNB shifts to an earlier date A sampling point and receives data;
After penetrating intermediate frequency process to all reception data, eNB estimates that the timing offset of the Physical Random Access Channel PRACH data received is Nta_PRACH;
By the first Timing Advance setting predetermined value TAGuard in Nta_PRACH and system and determine UE;
UE sends data according to the first Timing Advance.
2. transmit the method for data according to claim 1, it is characterized in that, described eNB shifts to an earlier date A sampling point reception data and comprises:
Measure and set predetermined value TAGuard in system the pre-set time of hardware acceptance data window and determine A;
ENB shifts to an earlier date A sampling point and receives data.
3. transmit the method for data according to claim 2, it is characterized in that, with TAGuard, amount pre-set time of hardware acceptance data window determines that A comprises:
(amount+TAGuard pre-set time of hardware acceptance data window) * Ts=A, Ts is the sampling period.
4. transmit the method for data according to claim 1, it is characterized in that, describedly determine that first Timing Advance of UE comprises by Nta_PRACH and TAGuard:
Nta_PRACH is greater than TAGuard, Nta_PRACH – TAGuard=first Timing Advance.
5. transmit the method for data according to claim 1, it is characterized in that, describedly determine that first Timing Advance of UE comprises by Nta_PRACH and TAGuard: Nta_PRACH is less than or equal to TAGuard, and the first Timing Advance equals zero.
6. transmit the method for data according to claim 1, it is characterized in that, described method comprises further:
Reception data for non-PRACH are removed after cyclic prefix CP, by last to orthogonal frequency division multiplex OFDM symbol of the data-moving of a front TAGuard sampling point, then do fast Fourier FFT process;
ENB does channel estimating to the data after FFT process, the position of the impulse response peak value of channel estimating with accurately arrive the alternate position spike of the channel estimating peak of eNB for estimate timing offset;
The second Timing Advance is calculated according to estimation timing offset;
UE sends data according to the second Timing Advance, and eNB calculates described alternate position spike again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310571111.3A CN104640195B (en) | 2013-11-13 | 2013-11-13 | A kind of method for transmitting data |
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| CN201310571111.3A CN104640195B (en) | 2013-11-13 | 2013-11-13 | A kind of method for transmitting data |
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| CN104640195B CN104640195B (en) | 2018-03-30 |
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Cited By (6)
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| WO2017107197A1 (en) * | 2015-12-25 | 2017-06-29 | 海能达通信股份有限公司 | Upstream access method, apparatus and base station in lte system |
| WO2018202116A1 (en) * | 2017-05-05 | 2018-11-08 | 华为技术有限公司 | Communication method, network device and terminal device |
| CN109168174A (en) * | 2018-08-02 | 2019-01-08 | 重庆邮电大学 | A method of mobile terminal location is carried out using beam characteristics |
| CN109981512A (en) * | 2017-12-28 | 2019-07-05 | 展讯通信（上海）有限公司 | Time offset estimation method and device, storage medium, the terminal of ofdm system |
| CN111279762A (en) * | 2017-11-27 | 2020-06-12 | 华为技术有限公司 | Synchronization method and device |
| CN112702774A (en) * | 2020-12-11 | 2021-04-23 | 杭州红岭通信息科技有限公司 | Processing method of base station side of access channel |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017107197A1 (en) * | 2015-12-25 | 2017-06-29 | 海能达通信股份有限公司 | Upstream access method, apparatus and base station in lte system |
| WO2018202116A1 (en) * | 2017-05-05 | 2018-11-08 | 华为技术有限公司 | Communication method, network device and terminal device |
| CN111279762A (en) * | 2017-11-27 | 2020-06-12 | 华为技术有限公司 | Synchronization method and device |
| CN111279762B (en) * | 2017-11-27 | 2021-12-28 | 华为技术有限公司 | Synchronization method and device |
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| CN109168174A (en) * | 2018-08-02 | 2019-01-08 | 重庆邮电大学 | A method of mobile terminal location is carried out using beam characteristics |
| CN109168174B (en) * | 2018-08-02 | 2021-09-28 | 重庆邮电大学 | Method for positioning mobile terminal by using beam characteristics |
| CN112702774A (en) * | 2020-12-11 | 2021-04-23 | 杭州红岭通信息科技有限公司 | Processing method of base station side of access channel |
| CN112702774B (en) * | 2020-12-11 | 2022-09-02 | 杭州红岭通信息科技有限公司 | Method for processing base station side of access channel |
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| CN104640195B (en) | 2018-03-30 |
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