CN103379616B - A kind of time advance method of adjustment for LTE and device - Google Patents
A kind of time advance method of adjustment for LTE and device Download PDFInfo
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Abstract
The present invention provides a kind of time advance method of adjustment for Long Term Evolution LTE and device, and wherein, the method comprises the following steps: that Timing Advance TA measured value is smoothed by A, scheduler, and adds up in scheduled time window length effectively TA population of measured values；B, carry out time advance adjustment according to TA smooth value；C, effective TA population of measured values is compared with predetermined number threshold value, if less than predetermined number threshold value, then perform step D；Otherwise, terminate；D, scheduler are leading to LTE high level application-specific, and wherein, Special leader refers to the predefined targeting sequencing for non-competing Stochastic accessing.The present invention can be greatly improved the precision that time advance adjusts.
Description
Technical field
The present invention relates to wireless communication technology, particularly to a kind of time advance method of adjustment for LTE
And device.
Background technology
In Long Term Evolution (Long Term Evolution, LTE) system, Timing Advance (Time Advance,
TA) it is one and receives subscriber equipment (User for characterizing evolution base station (evolved NodeB, eNodeB)
Equipment, UE) parameter of timing offset of sent data.In order to keep uplink synchronous, base station refers to
Show UE regulation time point send uplink demodulation reference signal (Demodulation reference signal,
DMRS) or detection reference signal (sounding reference signal, SRS), obtain through Timing measurement
By Physical Downlink Shared Channel, time advance adjusts order to TA, eNodeB to be handed down to UE and adjust
Whole, to keep the uplink synchronous of UE Yu eNodeB.
In LTE, it is relative to current up timing that time advance adjusts order, with 16 times of Ts (1Ts
The basic time unit of LTE) multiple represent, and by the time adjust MAC Control Element
Issue.Time adjusts the time advance adjustment order TA carrying 6 bits in MAC Control Element, uses
Indicate relative to current definitely adjustment amount NTA, oldRelative adjustment amount, span is TA=0,1 ..., 63,
The newest absolute adjustment amount is expressed as NTA, new=NTA, old+ (TA-31) × 16, unit is Ts.
In prior art, usually base station is according to the instantaneous TA value measured, or puts down based on instantaneous value
The sliding smooth value that obtains, then notice UE carries out the adjustment of TA.But, under low signal-to-noise ratio, owing to surveying
The instantaneous value of amount is easily affected by noise and interference and is become inaccurate.If it addition, the TA that can obtain
Measured value is less, considers further that UE mobility can make actual TA value have time varying characteristic, based on existing
Technology carries out the adjustment of time advance, base station can be made not reach when adjusting the up delivery time of UE intended
As a result, even disturb (ISI) between created symbol, thus greatly deteriorate the performance of uplink demodulation so that be
System throughput degradation.
Summary of the invention
In order to solve the problems referred to above, the present invention provides a kind of time advance method of adjustment for LTE and dress
Put, it is possible to increase the precision of time advance adjustment and efficiency.
The time advance method of adjustment for Long Term Evolution LTE of the present invention, comprises the following steps:
Timing Advance TA measured value is smoothed by A, scheduler, and it is long to add up scheduled time window
Interior effectively TA population of measured values；
B, carry out time advance adjustment according to TA smooth value；
C, effective TA population of measured values is compared with predetermined number threshold value, if less than pre-
Fixed number threshold value, then perform step D；Otherwise, terminate；
D, scheduler are leading to LTE high level application-specific, and wherein, Special leader refers to predefined use
Targeting sequencing in non-competing Stochastic accessing.
Wherein, in described step A, effective TA measured value refers to, it is thus achieved that corresponding during TA measured value
Signal to Interference plus Noise Ratio is higher than predetermined Signal to Interference plus Noise Ratio thresholding.
Wherein, in described step B, carry out time advance adjustment according to TA smooth value, put down including TA
Issue TA to UE when sliding value meets regularization condition and adjust order, and exceed predetermined at TA timer
Issuing to UE when time gate limit value and TA smooth value are unsatisfactory for regularization condition maintains synchronize not adjust TA
Command process.
Wherein, described TA smooth value meets regularization condition and refers to based on TA smooth value once or continuous several times
More than the condition of TA expectation adjusting range, wherein, TA expectation adjusting range referred to through the scheduled time
The interval of convergence of TA value after time advance adjustment.
Wherein, to be that TA timer period deducts a fixing non-negative time inclined for described predetermined time gate limit value
Shifting amount.
It addition, after described step D, may further include: judge whether that Special leader is arrived in application,
If it is, perform step E；Otherwise, step G is performed；
E, issuing Special leader to UE, notice UE initiates Stochastic accessing；
F, after receiving the accidental access signal of UE, issue accidental access response, then terminate；
G, judge whether TA timer exceedes scheduled time thresholding, if it does, then issue unregulated
TA order, is then back to step A；If be less than, the most directly return step A.
The time advance adjusting apparatus for Long Term Evolution LTE of the present invention, including scheduler and request slip
Unit, wherein, described scheduler, for Timing Advance TA measured value is smoothed, and add up
Effective TA population of measured values in scheduled time window length；And for according to the notice of described application unit to
LTE high level application-specific is leading；Described application unit, for carrying out time advance tune according to TA smooth value
Whole；Effective TA population of measured values is compared with predetermined number threshold value, if less than predetermined
Number threshold value, then notify that described scheduler is leading to LTE high level application-specific, wherein, and Special leader
Refer to the predefined targeting sequencing for non-competing Stochastic accessing.
Wherein, described effective TA measured value refers to, it is thus achieved that Signal to Interference plus Noise Ratio corresponding during TA measured value is higher than
Predetermined Signal to Interference plus Noise Ratio thresholding；Described carry out time advance adjustment according to TA smooth value, including TA smooth value
Issue TA to UE when meeting regularization condition and adjust order, and exceed the predetermined time at TA timer
Issuing to UE when threshold value and TA smooth value are unsatisfactory for regularization condition maintains synchronize not adjust TA order
Processing, wherein, described predetermined time gate limit value is that TA timer period deducts a fixing non-negative time
Side-play amount.
Wherein, described TA smooth value meets regularization condition and refers to based on TA smooth value once or continuous several times
More than the condition of TA expectation adjusting range, wherein, TA expectation adjusting range referred to through the scheduled time
The interval of convergence of TA value after time advance adjustment.
Furthermore it is also possible to farther include judging unit, it is used for judging whether application unit applies for before special
Lead, if application to; issue Special leader to UE, notice UE initiation Stochastic accessing, and receiving
After the accidental access signal of UE, issue accidental access response；If not applying for arriving, then judge TA timing
Whether device exceedes scheduled time thresholding, if it does, then issue unregulated TA order, then notifies to adjust
Timing Advance TA measured value is smoothed by degree device, and adds up effectively TA in scheduled time window length
Population of measured values；If be less than, the most directly Timing Advance TA measured value is put down by notice scheduler
Sliding process, and add up in scheduled time window length effectively TA population of measured values.
The invention has the beneficial effects as follows: according to the time advance method of adjustment for LTE and the dress of the present invention
Put, according to sharpening result and effective TA population of measured values statistics of TA measured value, less effectively in acquisition
By triggering non-competing random access procedure during TA measured value, when obtaining more effective TA measured value
Carry out time advance adjustment by TA smooth value, substantially increase the precision that time advance adjusts, it is to avoid
When effectively TA measured value is less, TA smooth value cannot reflect that actual TA value changes, and smooths based on this
Value carries out time advance and adjusts inaccurate, the problem even introducing ISI, it is achieved maintenance rapidly and efficiently is up
Synchronize, thus finally improve throughput of system.
Accompanying drawing explanation
Fig. 1 is the basic procedure schematic diagram of the time advance method of adjustment of the embodiment of the present invention.
Detailed description of the invention
Hereinafter, the time advance method of adjustment for LTE and the dress of the present invention is described in detail with reference to accompanying drawing 1
Put.
The time advance method of adjustment for Long Term Evolution LTE of the present invention, comprises the following steps:
100, Timing Advance TA measured value is smoothed by scheduler, and adds up scheduled time window
Effective TA population of measured values in long；
200, time advance adjustment is carried out according to TA smooth value；
300, effective TA population of measured values is compared with predetermined number threshold value, if be less than
Predetermined number threshold value, then perform step 400；Otherwise, terminate；
400, scheduler is leading to LTE high level application-specific, and wherein, Special leader refers to predefined
Targeting sequencing for non-competing Stochastic accessing.
Wherein, in described step 100, effective TA measured value refers to, it is thus achieved that corresponding during TA measured value
Signal to Interference plus Noise Ratio higher than predetermined Signal to Interference plus Noise Ratio thresholding.
Wherein, in described step 200, carry out time advance adjustment according to TA smooth value, including TA
Issue TA to UE when smooth value meets regularization condition and adjust order, and exceed predetermined at TA timer
Time gate limit value and TA smooth value issue to UE when being unsatisfactory for regularization condition and maintain synchronize not adjust TA
Command process.
Wherein, described TA smooth value meets regularization condition and refers to based on TA smooth value once or continuous several times
More than the condition of TA expectation adjusting range, wherein, TA expectation adjusting range referred to through the scheduled time
The interval of convergence of TA value after time advance adjustment.
Wherein, to be that TA timer period deducts a fixing non-negative time inclined for described predetermined time gate limit value
Shifting amount.
It addition, after described step 400, may further include: judge whether that Special leader is arrived in application,
If it is, perform step 500；Otherwise, step 700 is performed；
500, issuing Special leader to UE, notice UE initiates Stochastic accessing；
600, after receiving the accidental access signal of UE, issue accidental access response, then terminate；
700, judge whether TA timer exceedes scheduled time thresholding, do not adjust if it does, then issue
TA order, be then back to step 100；If be less than, the most directly return step 100.
The time advance adjusting apparatus for Long Term Evolution LTE of the present invention, including scheduler and request slip
Unit, wherein, scheduler, for Timing Advance TA measured value is smoothed, and add up predetermined
Effective TA population of measured values in time window；And it is high to LTE for the notice according to described application unit
Layer application-specific is leading；Application unit, for carrying out time advance adjustment according to TA smooth value；Will be effectively
TA population of measured values compares with predetermined number threshold value, if less than predetermined number threshold value,
Then notifying that described scheduler is leading to LTE high level application-specific, wherein, Special leader refers to pre-define
The targeting sequencing for non-competing Stochastic accessing.
Wherein, effective TA measured value refers to, it is thus achieved that Signal to Interference plus Noise Ratio corresponding during TA measured value is higher than predetermined
Signal to Interference plus Noise Ratio thresholding；Described carry out time advance adjustment according to TA smooth value, meet including TA smooth value
Issue TA to UE during regularization condition and adjust order, and exceed predetermined time threshold at TA timer
Issuing to UE when value and TA smooth value are unsatisfactory for regularization condition maintains synchronize not adjust TA command process,
Wherein, described predetermined time gate limit value is that TA timer period deducts a fixing non-negative time offset.
Wherein, TA smooth value meets regularization condition and refers to that once or continuous several times exceedes based on TA smooth value
The condition of TA expectation adjusting range, wherein, TA expectation adjusting range refers to carry through the time of the scheduled time
The interval of convergence of TA value after front adjustment.
Furthermore it is also possible to farther include judging unit, it is used for judging whether application unit applies for before special
Lead, if application to; issue Special leader to UE, notice UE initiation Stochastic accessing, and receiving
After the accidental access signal of UE, issue accidental access response；If not applying for arriving, then judge TA timing
Whether device exceedes scheduled time thresholding, if it does, then issue unregulated TA order, then notifies to adjust
Timing Advance TA measured value is smoothed by degree device, and adds up effectively TA in scheduled time window length
Population of measured values；If be less than, the most directly Timing Advance TA measured value is put down by notice scheduler
Sliding process, and add up in scheduled time window length effectively TA population of measured values.
Reference accompanying drawing 1, the basic procedure schematic diagram of the timing advance method of adjustment that the embodiment of the present invention provides,
The flow process of this embodiment can be realized by base station, specifically includes following steps:
S101, TA measured value is smoothed by scheduler, and adds up effectively TA in scheduled time window length
Population of measured values.Wherein, effective TA measured value refers to obtain Signal to Interference plus Noise Ratio height corresponding during TA measured value
In predetermined Signal to Interference plus Noise Ratio thresholding.
Specifically, physical layer is measured by eNodeB scheduler and the TA measured value that reports is smoothed,
Wherein physical layer can by the demodulated reference signal of physical uplink Traffic Channel (PUSCH), physically
Row controls demodulated reference signal or detection reference signal (Sounding) the acquisition TA of channel (PUCCH)
Measured value.
Time counter is set, the effective TA population of measured values in statistics scheduled time window length, wherein, time
Between the initial time of counter zero setting be that eNodeB issues accidental access response in UE initial access process
Moment, and zero setting after reaching scheduled time window length.
Wherein it is possible to use following formula to be smoothed:
TASoomthedk=(1-α) TAMeasuredk-1+α·TAMeasuredk
Wherein, TAMeasuredkRepresent kth effective TA measured value, TASoomthedkRepresent that kth TA is put down
Sliding value, α represents forgetting factor, and 0≤α≤1.
S102, carries out time advance adjustment according to TA smooth value.
Specifically, carry out time advance adjustment according to TA smooth value, meet including TA smooth value and adjust bar
Issue TA to UE during part and adjust order, and exceed predetermined time threshold and TA at TA timer and put down
Issuing to UE when sliding value is unsatisfactory for regularization condition maintains synchronize not adjust TA command process.
Wherein, TA smooth value meets regularization condition and refers to that once or continuous several times exceedes based on TA smooth value
The condition of TA expectation adjusting range.
Wherein, scheduled time thresholding is to deduct a fixing non-negative time offset by TA timer period
Obtain.
Wherein, TA expectation adjusting range refers to the convergence of TA value after time advance after a while adjusts
Interval.
For the uplink loss preventing TA timer expiry from causing, need in TA timer predetermined time
Thresholding and time now TA smooth value is unsatisfactory for regularization condition, issues a unregulated timing advance to UE
Adjust order.
S103, effective TA population of measured values of statistics compares with predetermined number threshold value.If do not surpassed
Cross predetermined number threshold value, then perform step S104；Otherwise, step S111 is performed.
S104: scheduler is leading to high-rise application-specific.
Wherein, this Special leader refers to the predefined targeting sequencing for non-competing Stochastic accessing.?
In LTE, high level carry out leading management and distribution.
S105: judge whether that application is to Special leader: if application is arrived, then perform step S106；If
Apply for less than, then perform step S108.
S106: issue Special leader to UE, notice UE initiates Stochastic accessing.
Specifically, eNodeB controls instruction (Downlink Control Indication, DCI) by descending
1A issues the configuration index of Special leader and Stochastic accessing to UE, and notice UE initiates Stochastic accessing.
UE, after receiving DCI 1A, initiates Stochastic accessing in the corresponding time with corresponding form.
S107: after receiving the accidental access signal of UE, issues accidental access response, and forwards step to
S111。
Specifically, after UE receives DCI1A, Stochastic accessing can be initiated；ENodeB receives the random of UE
Access after signal, issue accidental access response message, including timing adjustment information, uplink authorization and interim
C-RNTI (Cell Radio Network Temporary Identifier, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI).
S108: judge whether TA timer exceedes scheduled time thresholding, if be less than, the most directly returns
Step 101；If it does, then issue unregulated TA order, it is then back to step 101；
S109: terminate.
In sum, according to the time advance method of adjustment for LTE and the device of the present invention, according to TA
The sharpening result of measured value and effective TA population of measured values statistics, when obtaining less effective TA measured value
By triggering non-competing random access procedure, smoothed by TA when obtaining more effective TA measured value
Value carries out time advance adjustment, substantially increases the precision that time advance adjusts, it is to avoid measure at effective TA
When being worth less, TA smooth value cannot reflect that actual TA value changes, and carries based on this smooth value time of carrying out
Front adjustment is inaccurate, the problem even introducing ISI, it is achieved maintenance uplink synchronous rapidly and efficiently, thus
Improve throughput of system eventually.
Be above to make those of ordinary skill in the art understand the present invention, and the present invention is carried out detailed
Describe, however, it is contemplated that can also be made it in the range of the claim without departing from the present invention is contained
Changing and modifications of it, these change and modifications the most within the scope of the present invention.
Claims (10)
1. the time advance method of adjustment for Long Term Evolution LTE, it is characterised in that include following
Step:
Timing Advance TA measured value is smoothed by A, scheduler, and it is long to add up scheduled time window
Interior effectively TA population of measured values；
B, carry out time advance adjustment according to TA smooth value；
C, effective TA population of measured values is compared with predetermined number threshold value, if less than pre-
Fixed number threshold value, then perform step D；Otherwise, terminate；
D, scheduler are leading to LTE high level application-specific, and wherein, Special leader refers to predefined use
Targeting sequencing in non-competing Stochastic accessing.
2. the time advance method of adjustment for LTE as claimed in claim 1, it is characterised in that
In described step A, effective TA measured value refers to, it is thus achieved that Signal to Interference plus Noise Ratio corresponding during TA measured value is higher than
Predetermined Signal to Interference plus Noise Ratio thresholding.
3. the time advance method of adjustment for LTE as claimed in claim 1, it is characterised in that
In described step B, carry out time advance adjustment according to TA smooth value, meet including TA smooth value and adjust
During condition to UE issue TA adjust order, and TA timer exceed predetermined time gate limit value and
Issuing to UE when TA smooth value is unsatisfactory for regularization condition maintains synchronize not adjust TA command process.
4. the time advance method of adjustment for LTE as claimed in claim 3, it is characterised in that institute
State TA smooth value meet regularization condition refer to based on TA smooth value once or continuous several times more than TA expect
The condition of adjusting range, wherein, TA expectation adjusting range refers to that the time advance through the scheduled time adjusts
The interval of convergence of rear TA value.
5. the time advance method of adjustment for LTE as claimed in claim 3, it is characterised in that institute
Stating predetermined time gate limit value is that TA timer period deducts a fixing non-negative time offset.
6. the time advance method of adjustment for LTE as according to any one of claim 1 to 5, its
It is characterised by, after described step D, farther includes: judge whether that Special leader is arrived in application, as
Fruit is, then perform step E；Otherwise, step G is performed；
E, issuing Special leader to UE, notice UE initiates Stochastic accessing, then performs step F；
F, after receiving the accidental access signal of UE, issue accidental access response, then method terminates；
G, judge whether TA timer exceedes scheduled time thresholding, if it does, then issue unregulated
TA order, is then back to step A；If be less than, the most directly return step A.
7. the time advance adjusting apparatus for Long Term Evolution LTE, it is characterised in that include scheduling
Device and application unit, wherein,
Described scheduler, for being smoothed Timing Advance TA measured value, and adds up pre-timing
Between effective TA population of measured values in window length；And it is high-rise to LTE for the notice according to described application unit
Application-specific is leading；
Described application unit, for carrying out time advance adjustment according to TA smooth value；Effective TA is measured
Value number compares with predetermined number threshold value, if less than predetermined number threshold value, then notified
Described scheduler is leading to LTE high level application-specific, wherein, Special leader refer to predefined for
The targeting sequencing of non-competing Stochastic accessing.
8. the time advance adjusting apparatus for Long Term Evolution LTE as claimed in claim 7, its feature
It is,
Described effective TA measured value refers to, it is thus achieved that Signal to Interference plus Noise Ratio corresponding during TA measured value is higher than predetermined letter
Dry making an uproar compares thresholding；
Described carry out time advance adjustment according to TA smooth value, when meeting regularization condition including TA smooth value
Issue TA to UE and adjust order, and exceed predetermined time gate limit value and TA at TA timer and smooth
Issuing to UE when value is unsatisfactory for regularization condition maintains synchronize not adjust TA command process, wherein, described
Predetermined time gate limit value is that TA timer period deducts a fixing non-negative time offset.
9. the time advance adjusting apparatus for Long Term Evolution LTE as claimed in claim 7, its feature
Being, described TA smooth value meets regularization condition and refers to that once or continuous several times exceedes based on TA smooth value
The condition of TA expectation adjusting range, wherein, TA expectation adjusting range refers to carry through the time of the scheduled time
The interval of convergence of TA value after front adjustment.
10. the time advance for Long Term Evolution LTE as according to any one of claim 7 to 9 adjusts
Device, it is characterised in that farther include judging unit, is used for judging whether application unit applies for special
Leading, if application to; issue Special leader to UE, notice UE initiation Stochastic accessing, and receiving
After the accidental access signal of UE, issue accidental access response；If not applying for arriving, then judge TA timing
Whether device exceedes scheduled time thresholding, if it does, then issue unregulated TA order, then notifies to adjust
Timing Advance TA measured value is smoothed by degree device, and adds up effectively TA in scheduled time window length
Population of measured values；If be less than, the most directly Timing Advance TA measured value is put down by notice scheduler
Sliding process, and add up in scheduled time window length effectively TA population of measured values.
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| US10455603B2 (en) * | 2016-12-06 | 2019-10-22 | Qualcomm Incorporated | Wireless transmission timing based on timing advance values in shortened transmission time interval transmissions |
| CN110838898B (en) | 2018-08-15 | 2021-01-26 | 上海朗帛通信技术有限公司 | Method and device used in wireless communication node |
| CN112583747B (en) * | 2019-09-30 | 2022-05-17 | 华为技术有限公司 | Method for receiving indication, method for sending indication and communication device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101883423A (en) * | 2009-05-07 | 2010-11-10 | 大唐移动通信设备有限公司 | Method, system and device for determining position information of terminal |
| CN102595527A (en) * | 2012-03-21 | 2012-07-18 | 武汉邮电科学研究院 | Method and device for long term evolution (LTE) change-over judgment based on timing advance (TA) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101883423A (en) * | 2009-05-07 | 2010-11-10 | 大唐移动通信设备有限公司 | Method, system and device for determining position information of terminal |
| CN102595527A (en) * | 2012-03-21 | 2012-07-18 | 武汉邮电科学研究院 | Method and device for long term evolution (LTE) change-over judgment based on timing advance (TA) |
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