CN103379616A - Time-advance adjustment method and device for LTE - Google Patents
Time-advance adjustment method and device for LTE Download PDFInfo
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- CN103379616A CN103379616A CN2012101200877A CN201210120087A CN103379616A CN 103379616 A CN103379616 A CN 103379616A CN 2012101200877 A CN2012101200877 A CN 2012101200877A CN 201210120087 A CN201210120087 A CN 201210120087A CN 103379616 A CN103379616 A CN 103379616A
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Abstract
The invention provides a time-advance adjustment method and device for the LTE. The method comprises the following steps: A, conducting smoothing processing on measured values of TA by a scheduler, and counting the number of the effective measured values of the TA within the preset time window; B, conducting time-advance adjustment according to the smoothing value of the TA; C, comparing the number of the effective measured values of the TA with the preset number threshold value, if the number of the effective measured values of the TA does not exceed the preset number threshold value, executing the step D, and otherwise ending the step; D, applying for a dedicated leader by the scheduler from the LTE high level, wherein the dedicated leader is a predefined leader sequence used for non-competitive random access. The time-advance adjustment method and device for the LTE can greatly improve the accuracy of the time-advance adjustment.
Description
Technical field
The present invention relates to wireless communication technology, particularly a kind of time advance method of adjustment and device for LTE.
Background technology
Long Term Evolution (Long Term Evolution, LTE) in the system, Timing Advance (Time Advance, TA) be one and be used for characterizing evolution base station (evolved NodeB, eNodeB) receive the parameter of the timing offset of subscriber equipment (User Equipment, the UE) data that send.In order to keep uplink synchronous, base station indication UE sends uplink demodulation reference signal (Demodulation reference signal at official hour point, DMRS) or detection reference signal (sounding reference signal, SRS), obtain TA through Timing measurement, eNodeB is handed down to UE by Physical Downlink Shared Channel with time advance adjustment order and adjusts, to keep the uplink synchronous of UE and eNodeB.
Among the LTE, time advance adjustment order is with respect to current up timing, represents with the multiple of 16 times of Ts (1Ts is the basic time unit of LTE), and adjusts MAC Control Element by the time and issue.Time is adjusted the time advance adjustment order TA that has carried 6 bits in the MAC Control Element, is used to refer to respect to current absolute adjustment amount N
TA, oldRelative adjustment amount, span is T
A=0,1 ..., 63, so new absolute adjustment amount is expressed as N
TA, new=NTA, old+ (T
A-31) * 16, unit is Ts.
In the prior art, generally be the base station according to the instantaneous TA value of measuring, perhaps smoothly obtain smooth value based on instantaneous value, then notify UE to carry out the adjustment of TA.But, under low signal-to-noise ratio, owing to the instantaneous value of measuring is subjected to the impact of Noise and Interference to become inaccurate easily.In addition, if the TA measured value that can obtain is less, consider again the meeting of UE mobility so that actual TA value has time varying characteristic, carry out the adjustment of time advance based on prior art, meeting is not so that the base station reaches expected result when adjusting the up delivery time of UE, even disturb (ISI) between created symbol, thus greatly worsen the performance of uplink demodulation, so that throughput of system descends.
Summary of the invention
In order to address the above problem, the invention provides a kind of time advance method of adjustment and device for LTE, can improve precision and efficient that time advance is adjusted.
Time advance method of adjustment for Long Term Evolution LTE of the present invention comprises the following steps:
A, scheduler carry out smoothing processing to Timing Advance TA measured value, and the long interior effectively TA population of measured values of statistics scheduled time window;
B, carry out the time advance adjustment according to the TA smooth value;
C, effective TA population of measured values and predetermined number threshold value are compared, if be no more than predetermined number threshold value, then execution in step D; Otherwise, finish;
D, scheduler are leading to the high-rise application-specific of LTE, and wherein, Special leader refers to predefined for the non-competing at random targeting sequencing of access.
Wherein, in described steps A, effectively the TA measured value refers to, corresponding Signal to Interference plus Noise Ratio is higher than predetermined Signal to Interference plus Noise Ratio thresholding when obtaining the TA measured value.
Wherein, in described step B, carry out the time advance adjustment according to the TA smooth value, comprise when the TA smooth value satisfies regularization condition that issuing TA to UE adjusts order, and the TA timer surpass predetermined time threshold value and the TA smooth value issue to UE when not satisfying regularization condition and keep the synchronous TA command process of not adjusting.
Wherein, described TA smooth value satisfy regularization condition refer to based on the TA smooth value once or continuous several times surpass the condition of TA expectation adjusting range, wherein, the interval of convergence of TA value after TA expectation adjusting range refers to adjust through the time advance of the scheduled time.
Wherein, threshold value is to deduct a fixing non-negative time offset amount TA timer cycle described predetermined time.
In addition, after described step D, may further include: judge whether application to Special leader, if so, execution in step E then; Otherwise, execution in step G;
E, issue Special leader to UE, notice UE initiates at random access;
F, after receiving the accidental access signal of UE, issue accidental access response, then finish;
G, judge that whether the TA timer surpasses scheduled time thresholding, if surpass, then issue unregulated TA order, then return steps A; If be no more than, then directly return steps A.
Time advance adjusting device for Long Term Evolution LTE of the present invention comprises scheduler and application unit, and wherein, described scheduler is used for Timing Advance TA measured value is carried out smoothing processing, and the long interior effectively TA population of measured values of statistics scheduled time window; And be used for according to the notice of described application unit leading to the high-rise application-specific of LTE; Described application unit is used for carrying out the time advance adjustment according to the TA smooth value; Effective TA population of measured values and the number threshold value of being scheduled to are compared, if be no more than predetermined number threshold value, then notify described scheduler leading to the high-rise application-specific of LTE, wherein, Special leader refers to predefined for the non-competing at random targeting sequencing of access.
Wherein, described effective TA measured value refers to that corresponding Signal to Interference plus Noise Ratio is higher than predetermined Signal to Interference plus Noise Ratio thresholding when obtaining the TA measured value; Describedly carry out the time advance adjustment according to the TA smooth value, comprise that issuing TA to UE when the TA smooth value satisfies regularization condition adjusts order, and the TA timer surpass predetermined time threshold value and the TA smooth value issue to UE when not satisfying regularization condition and keep the synchronous TA command process of not adjusting, wherein, threshold value is to deduct a fixing non-negative time offset amount TA timer cycle described predetermined time.
Wherein, described TA smooth value satisfy regularization condition refer to based on the TA smooth value once or continuous several times surpass the condition of TA expectation adjusting range, wherein, the interval of convergence of TA value after TA expectation adjusting range refers to adjust through the time advance of the scheduled time.
In addition, can further include judging unit, be used for judging whether application unit applies for Special leader, if application to issue Special leader to UE, notice UE initiation accesses at random, and after receiving the accidental access signal of UE, issues accidental access response; If application is not arrived, judge then whether the TA timer surpasses scheduled time thresholding, if surpass, then issue unregulated TA order, then notify scheduler that Timing Advance TA measured value is carried out smoothing processing, and the long interior effectively TA population of measured values of statistics scheduled time window; If be no more than, then directly notify scheduler that Timing Advance TA measured value is carried out smoothing processing, and the long interior effectively TA population of measured values of statistics scheduled time window.
The invention has the beneficial effects as follows: according to time advance method of adjustment and the device for LTE of the present invention, level and smooth result and effective TA population of measured values statistics according to the TA measured value, when obtaining less effective TA measured value, pass through to trigger non-competing random access procedure, when obtaining more effective TA measured value, carry out the time advance adjustment by the TA smooth value, greatly improved the precision that time advance is adjusted, avoid that the TA smooth value can't reflect actual TA value variation when effectively the TA measured value is less, and carry out time advance based on this smooth value and adjust inaccurate, even the problem of introducing ISI, realize the uplink synchronous of keeping rapidly and efficiently, thereby finally improve throughput of system.
Description of drawings
Fig. 1 is the basic procedure schematic diagram of the time advance method of adjustment of the embodiment of the invention.
Embodiment
Below, 1 describe time advance method of adjustment and device for LTE of the present invention in detail with reference to the accompanying drawings.
Time advance method of adjustment for Long Term Evolution LTE of the present invention comprises the following steps:
100, scheduler carries out smoothing processing to Timing Advance TA measured value, and the long interior effectively TA population of measured values of statistics scheduled time window;
200, carry out the time advance adjustment according to the TA smooth value;
300, effective TA population of measured values and the number threshold value of being scheduled to are compared, if be no more than predetermined number threshold value, then execution in step 400; Otherwise, finish;
400, scheduler is leading to the high-rise application-specific of LTE, and wherein, Special leader refers to predefined for the non-competing at random targeting sequencing of access.
Wherein, in described step 100, effectively the TA measured value refers to, corresponding Signal to Interference plus Noise Ratio is higher than predetermined Signal to Interference plus Noise Ratio thresholding when obtaining the TA measured value.
Wherein, in described step 200, carry out the time advance adjustment according to the TA smooth value, comprise when the TA smooth value satisfies regularization condition that issuing TA to UE adjusts order, and the TA timer surpass predetermined time threshold value and the TA smooth value issue to UE when not satisfying regularization condition and keep the synchronous TA command process of not adjusting.
Wherein, described TA smooth value satisfy regularization condition refer to based on the TA smooth value once or continuous several times surpass the condition of TA expectation adjusting range, wherein, the interval of convergence of TA value after TA expectation adjusting range refers to adjust through the time advance of the scheduled time.
Wherein, threshold value is to deduct a fixing non-negative time offset amount TA timer cycle described predetermined time.
In addition, after described step 400, may further include: judge whether application to Special leader, if so, then execution in step 500; Otherwise, execution in step 700;
500, issue Special leader to UE, notice UE initiates at random access;
600, after receiving the accidental access signal of UE, issue accidental access response, then finish;
700, judge whether the TA timer surpasses scheduled time thresholding, if surpass, then issue unregulated TA order, then return step 100; If be no more than, then directly return step 100.
Time advance adjusting device for Long Term Evolution LTE of the present invention comprises scheduler and application unit, and wherein, scheduler is used for Timing Advance TA measured value is carried out smoothing processing, and the long interior effectively TA population of measured values of statistics scheduled time window; And be used for according to the notice of described application unit leading to the high-rise application-specific of LTE; Application unit is used for carrying out the time advance adjustment according to the TA smooth value; Effective TA population of measured values and the number threshold value of being scheduled to are compared, if be no more than predetermined number threshold value, then notify described scheduler leading to the high-rise application-specific of LTE, wherein, Special leader refers to predefined for the non-competing at random targeting sequencing of access.
Wherein, effectively the TA measured value refers to, corresponding Signal to Interference plus Noise Ratio is higher than predetermined Signal to Interference plus Noise Ratio thresholding when obtaining the TA measured value; Describedly carry out the time advance adjustment according to the TA smooth value, comprise that issuing TA to UE when the TA smooth value satisfies regularization condition adjusts order, and the TA timer surpass predetermined time threshold value and the TA smooth value issue to UE when not satisfying regularization condition and keep the synchronous TA command process of not adjusting, wherein, threshold value is to deduct a fixing non-negative time offset amount TA timer cycle described predetermined time.
Wherein, the TA smooth value satisfy regularization condition refer to based on the TA smooth value once or continuous several times surpass the condition of TA expectation adjusting range, wherein, the interval of convergence of TA value after TA expectation adjusting range refers to adjust through the time advance of the scheduled time.
In addition, can further include judging unit, be used for judging whether application unit applies for Special leader, if application to issue Special leader to UE, notice UE initiation accesses at random, and after receiving the accidental access signal of UE, issues accidental access response; If application is not arrived, judge then whether the TA timer surpasses scheduled time thresholding, if surpass, then issue unregulated TA order, then notify scheduler that Timing Advance TA measured value is carried out smoothing processing, and the long interior effectively TA population of measured values of statistics scheduled time window; If be no more than, then directly notify scheduler that Timing Advance TA measured value is carried out smoothing processing, and the long interior effectively TA population of measured values of statistics scheduled time window.
With reference to the accompanying drawings 1, the basic procedure schematic diagram of the timing advance method of adjustment that the embodiment of the invention provides, the flow process of this embodiment can realize by the base station, specifically may further comprise the steps:
S101, scheduler carries out smoothing processing to the TA measured value, and the long interior effectively TA population of measured values of statistics scheduled time window.Corresponding Signal to Interference plus Noise Ratio was higher than predetermined Signal to Interference plus Noise Ratio thresholding when wherein, effectively the TA measured value referred to obtain the TA measured value.
Particularly, the eNodeB scheduler is measured physical layer and the TA measured value that reports carries out smoothing processing, and wherein physical layer can obtain the TA measured value by the demodulated reference signal of physical uplink Traffic Channel (PUSCH), demodulated reference signal or the detection reference signal (Sounding) of Physical Uplink Control Channel (PUCCH).
The setup times counter, the effective TA population of measured values in statistics scheduled time window is long, wherein, the initial time of time counter zero setting is the moment that eNodeB issues accidental access response in the UE initial access process, and is reaching the long rear zero setting of scheduled time window.
Wherein, can adopt following formula to carry out smoothing processing:
TASoomthed
k＝(1-α)·TAMeasured
k-1+α·TAMeasured
k
Wherein, TAMeasured
kRepresent k effectively TA measured value, TASoomthed
kRepresent k TA smooth value, α represents forgetting factor, and 0≤α≤1.
S102 carries out the time advance adjustment according to the TA smooth value.
Particularly, carry out the time advance adjustment according to the TA smooth value, comprise when the TA smooth value satisfies regularization condition that issuing TA to UE adjusts order, and the TA timer surpass predetermined time thresholding and the TA smooth value issue to UE when not satisfying regularization condition and keep the synchronous TA command process of not adjusting.
Wherein, the TA smooth value satisfy regularization condition refer to based on the TA smooth value once or continuous several times surpass the condition of TA expectation adjusting range.
Wherein, scheduled time thresholding is to deduct a fixing non-negative time offset amount by the TA timer cycle to obtain.
Wherein, TA expectation adjusting range refers to the interval of convergence of TA value after time advance is after a while adjusted.
For the uplink loss that prevents that the TA timer expiry from causing, in the time of need at TA timer predetermined time thresholding and this moment, the TA smooth value did not satisfy regularization condition, issue a unregulated timing advance adjustment order to UE.
S103, effective TA population of measured values and the predetermined number threshold value of statistics compare.If be no more than the predetermined number threshold value, execution in step S104 then; Otherwise, execution in step S111.
S104: scheduler is leading to high-rise application-specific.
Wherein, this Special leader refers to predefined for the non-competing at random targeting sequencing of access.In LTE, carry out leading management and distribution by high level.
S105: judge whether that application is to Special leader: if apply for arriving, execution in step S106 then; If application is less than, execution in step S108 then.
S106: issue Special leader to UE, notice UE initiates at random access.
Particularly, the configuration index that eNodeB indicates (Downlink Control Indication, DCI) 1A to issue Special leader and access at random to UE by descending control, notice UE initiates at random access.UE initiates at random access in the corresponding time with corresponding form after receiving DCI 1A.
S107: after receiving the accidental access signal of UE, issue accidental access response, and forward step S111 to.
Particularly, after UE receives DCI1A, can initiate to access at random; ENodeB issues accidental access response message after receiving the accidental access signal of UE, comprises timing adjustment information, uplink authorization and interim C-RNTI (Cell Radio Network Temporary Identifier, Cell Radio Network Temporary Identifier/Identity, Cell-RNTI).
S108: judge that whether the TA timer surpasses scheduled time thresholding, if be no more than, then directly returns step 101; If surpass, then issue unregulated TA order, then return step 101;
S109: finish.
In sum, according to time advance method of adjustment and the device for LTE of the present invention, level and smooth result and effective TA population of measured values statistics according to the TA measured value, when obtaining less effective TA measured value, pass through to trigger non-competing random access procedure, when obtaining more effective TA measured value, carry out the time advance adjustment by the TA smooth value, greatly improved the precision that time advance is adjusted, avoid that the TA smooth value can't reflect actual TA value variation when effectively the TA measured value is less, and carry out time advance based on this smooth value and adjust inaccurate, even the problem of introducing ISI, realize the uplink synchronous of keeping rapidly and efficiently, thereby finally improve throughput of system.
More than be in order to make those of ordinary skills understand the present invention; and the detailed description that the present invention is carried out; but can expect; within not breaking away from the scope that claim of the present invention contains, can also make other changes and modifications, these variations and revising all in protection scope of the present invention.
Claims (10)
1. a time advance method of adjustment that is used for Long Term Evolution LTE is characterized in that, comprises the following steps:
A, scheduler carry out smoothing processing to Timing Advance TA measured value, and the long interior effectively TA population of measured values of statistics scheduled time window;
B, carry out the time advance adjustment according to the TA smooth value;
C, effective TA population of measured values and predetermined number threshold value are compared, if be no more than predetermined number threshold value, then execution in step D; Otherwise, finish;
D, scheduler are leading to the high-rise application-specific of LTE, and wherein, Special leader refers to predefined for the non-competing at random targeting sequencing of access.
2. the time advance method of adjustment for LTE as claimed in claim 1 is characterized in that, in described steps A, effectively the TA measured value refers to, corresponding Signal to Interference plus Noise Ratio is higher than predetermined Signal to Interference plus Noise Ratio thresholding when obtaining the TA measured value.
3. the time advance method of adjustment for LTE as claimed in claim 1, it is characterized in that, in described step B, carry out the time advance adjustment according to the TA smooth value, comprise when the TA smooth value satisfies regularization condition that issuing TA to UE adjusts order, and the TA timer surpass predetermined time threshold value and the TA smooth value issue to UE when not satisfying regularization condition and keep the synchronous TA command process of not adjusting.
4. the time advance method of adjustment for LTE as claimed in claim 3, it is characterized in that, described TA smooth value satisfy regularization condition refer to based on the TA smooth value once or continuous several times surpass the condition of TA expectation adjusting range, wherein, TA expectation adjusting range refers to the interval of convergence through TA value after the time advance adjustment of the scheduled time.
5. the time advance method of adjustment for LTE as claimed in claim 3 is characterized in that, described predetermined time threshold value be to deduct a fixing non-negative time offset amount TA timer cycle.
6. such as each described time advance method of adjustment for LTE in the claim 1 to 5, it is characterized in that, after described step D, further comprise: judge whether application to Special leader, if so, execution in step E then; Otherwise, execution in step G;
E, issue Special leader to UE, notice UE initiates at random access;
F, after receiving the accidental access signal of UE, issue accidental access response, then finish;
G, judge that whether the TA timer surpasses scheduled time thresholding, if surpass, then issue unregulated TA order, then return steps A; If be no more than, then directly return steps A.
7. a time advance adjusting device that is used for Long Term Evolution LTE is characterized in that, comprises scheduler and application unit, wherein,
Described scheduler is used for Timing Advance TA measured value is carried out smoothing processing, and the long interior effectively TA population of measured values of statistics scheduled time window; And be used for according to the notice of described application unit leading to the high-rise application-specific of LTE;
Described application unit is used for carrying out the time advance adjustment according to the TA smooth value; Effective TA population of measured values and the number threshold value of being scheduled to are compared, if be no more than predetermined number threshold value, then notify described scheduler leading to the high-rise application-specific of LTE, wherein, Special leader refers to predefined for the non-competing at random targeting sequencing of access.
8. the time advance adjusting device for Long Term Evolution LTE as claimed in claim 7 is characterized in that,
Described effective TA measured value refers to that corresponding Signal to Interference plus Noise Ratio is higher than predetermined Signal to Interference plus Noise Ratio thresholding when obtaining the TA measured value;
Describedly carry out the time advance adjustment according to the TA smooth value, comprise that issuing TA to UE when the TA smooth value satisfies regularization condition adjusts order, and the TA timer surpass predetermined time threshold value and the TA smooth value issue to UE when not satisfying regularization condition and keep the synchronous TA command process of not adjusting, wherein, threshold value is to deduct a fixing non-negative time offset amount TA timer cycle described predetermined time.
9. the time advance adjusting device for Long Term Evolution LTE as claimed in claim 7, it is characterized in that, described TA smooth value satisfy regularization condition refer to based on the TA smooth value once or continuous several times surpass the condition of TA expectation adjusting range, wherein, TA expectation adjusting range refers to the interval of convergence through TA value after the time advance adjustment of the scheduled time.
10. such as each described time advance adjusting device for Long Term Evolution LTE in the claim 7 to 9, it is characterized in that, further comprise judging unit, be used for judging whether application unit applies for Special leader, if the application to issue Special leader to UE, notice UE initiates at random access, and after receiving the accidental access signal of UE, issues accidental access response; If application is not arrived, judge then whether the TA timer surpasses scheduled time thresholding, if surpass, then issue unregulated TA order, then notify scheduler that Timing Advance TA measured value is carried out smoothing processing, and the long interior effectively TA population of measured values of statistics scheduled time window; If be no more than, then directly notify scheduler that Timing Advance TA measured value is carried out smoothing processing, and the long interior effectively TA population of measured values of statistics scheduled time window.
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| CN110024318A (en) * | 2016-12-06 | 2019-07-16 | 高通股份有限公司 | Wireless transmission timing based on the timing advance value in the transmission time interval transmission through shortening |
| CN110838898A (en) * | 2018-08-15 | 2020-02-25 | 上海朗帛通信技术有限公司 | Method and device used in wireless communication node |
| CN112583747A (en) * | 2019-09-30 | 2021-03-30 | 华为技术有限公司 | Method for receiving indication, method for sending indication and communication device |
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| CN110024318A (en) * | 2016-12-06 | 2019-07-16 | 高通股份有限公司 | Wireless transmission timing based on the timing advance value in the transmission time interval transmission through shortening |
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| CN112583747A (en) * | 2019-09-30 | 2021-03-30 | 华为技术有限公司 | Method for receiving indication, method for sending indication and communication device |
| WO2021063210A1 (en) * | 2019-09-30 | 2021-04-08 | 华为技术有限公司 | Instruction receiving method, instruction sending method, and communication apparatus |
| 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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