CN102685915A - Self-adaptive dispatching method of uplink signal channel detection pilot frequency - Google Patents

Self-adaptive dispatching method of uplink signal channel detection pilot frequency Download PDF

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CN102685915A
CN102685915A CN2012101341127A CN201210134112A CN102685915A CN 102685915 A CN102685915 A CN 102685915A CN 2012101341127 A CN2012101341127 A CN 2012101341127A CN 201210134112 A CN201210134112 A CN 201210134112A CN 102685915 A CN102685915 A CN 102685915A
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srs
base station
channel
sinr
uplink
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CN102685915B (en
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余少伟
裴丽
温晓东
刘超
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Beijing Jiaotong University
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Abstract

The invention discloses a self-adaptive dispatching method of an uplink signal channel detection pilot frequency, which relates to the technical field of the dispatching of the mobile communication in long-term evolution system, and solves the self-adaptive dispatching problem of the uplink signal channel detection pilot frequency. The method comprises the steps that a base station firstly detects the characteristics of a signal channel between reference pilot frequency user equipment (UE) and the base station based on a reference pilot frequency of an uplink signal channel of the UE; secondly the base station estimates a difference value between the signal-to-interference-plus-noise ratio (SINR) of the uplink signal of each UE and the SINR of a control target according to the characteristics of the signal channel and estimates a movement speed of each UE according to the correlation property of the signal channel between the UE and the base station; and thirdly, the base station classifies the UE applying for the dispatching of software requirement specifications (SRS) according to the movement speed of the UE and the difference value between the SINR of the UE uplink signal and the SINR of the control target and self-adaptively dispatches and allocates an uplink SRS resource of each UE according to the type and the quantity of the UE applying for the dispatching of the SRS.

Description

A kind of self-adapting dispatching method of ascending channel detecting pilot frequency
Technical field
The present invention relates to the dispatching technique field in Long Term Evolution (Long Term Evolution the is called for short LTE) system of mobile communication, the self-adapting dispatching method of the ascending channel detecting pilot frequency in the particularly a kind of LTE system.
Background technology
In TD-LTE (Long Term Evolution is called for short LTE) system, mainly utilize Sounding Reference Signal (Sounding Reference Signal is called for short SRS) that up channel is surveyed.Transmit uncorrelated SRS with uplink data channels and ascending control information and be mainly used in the uplink signal-channel quality estimation.Carry out the frequency selective scheduling of up link according to the result of uplink SRS channel estimating; The selection (MCS) of modulating adaptively and encode, the uplink channel information based on SRS also can be used for uplink power control, up timing estimation, supports the various initialization of the current not UE (user equipment subscriber equipment) of scheduling and support arrival bearing UE to estimate and generate the functions such as down beam shaping of pointing to arrival bearing UE according to certain criterion according to the spatial coherence of UE upward signal in addition.
The base station can be sent SRS or periodically send SRS in configuration UE single ground.SRS always is positioned at last the single carrier orthogonal frequency division that has disposed subframe and takes in (single carrier orthogonal frequency division multiplex is called for short SC-OFDM) symbol.The base station is through the transmission cycle T of the SRS of the specific dedicated signaling parameter configuration UE of UE SRSWith SRS sub-frame offset T OffsetThe SRS cycle of UE can be configured to 2,5,10,20,40,80,160 or 320 milliseconds.In order to support a plurality of UE frequency selective scheduling; Having SRS that different detective bandwidths require from different UEs submits to stack at frequency spectrum and puts; The SRS that is certain UE is mapped to the subcarrier that sequence number is an odd number; The SRS of another one UE is mapped to the subcarrier that sequence number is an even number, like this, is that the subcarrier that 2 FDM (Frequency Division Multiplex) that interweave make the SRS signal occupy has the pectination frequency spectrum with repetition factor.Secondly; In order to support more UE to survey the demand of same frequency range channel information simultaneously; The LTE system has also introduced code division multiplexing in the transmission of SRS; Support at most SRS that 8 UE send with identical basic sequence
Figure BDA0000159447580000021
wherein
Figure BDA0000159447580000022
multiplexing on identical Resource Block, utilize the difference circulation time shift of same basic sequence
Figure BDA0000159447580000023
to realize that mutual quadrature isolates.In addition; When UE is nearer apart from the base station; The base station can be easy to control UE and send the wide detection of filled band most complete channel information is provided, but can not further increase its transmitted power to keep filled band when wide as UE, and channel estimating performance can descend along with the increase of path loss.In order to improve received signal to noise ratio and to support that more UE carries out the SRS channel detection; The LTE system has introduced the channel detection of narrow band mode; The channel detection of also claiming frequency-hopping mode; Being UE SRS surveys the subband of appointment in every SRS cycle, according to certain frequency hopping pattern, surveys complete upstream band channel information through a plurality of SRS week after dates.The TD-LTE system supports multiple SRS band width configuration; According to the 3GPP standard; The LTE system of 20MHz supports SRS frequency hopping bandwidth that 4,24,48 and 96 Resource Block are arranged; The minimum detective bandwidth of supporting is 4 Resource Block, and a minimum detective bandwidth provides the high-quality uplink channel information from power limited UE.Detective bandwidth also is defined as to each other multiple each other, promptly as a tree structure to support the frequency hopping of different arrowbands SRS bandwidth.The factor that influences SRS frequency hopping band width configuration comprises the maximum power of UE, can support to survey the quantity of UE, and the detective bandwidth that from the uplink scheduling that relies on channel conditions, benefits etc.In the LTE system, the specific SRS bandwidth of a given UE use is configured through one 2 bit UE special parameter " SRS bandwidth ".
In a word, the LTE system is that the SRS configuration of UE provides and enriches flexible way, supports time division multiplexing, code division multiplexing, frequency division multiplexing and the combination between them.But the UE SRS maximum UE number that different combinations can be supported is different, for example; In the TD-LTE system; Suppose when the SRS cycle is 5 milliseconds, survey that each SRS dredges maximum 8 cyclic shifts of supporting if carry out broad-band channel; Totally 2 SRS of the SRS that surveys based on full bandwidth dredges, and can only support 16 UE to carry out channel detection altogether.In addition; Different combinations is applicable to different wireless propagation environments; The difference of SRS configuration has different influences to the uplink channel estimation error based on SRS under different wireless channel environments, and the error of the down beam shaping that calculates based on the uplink SRS spatial coherence is also had different influences.System is in actual motion; Accurate fair which UE in base station sends the SRS channel detection and base station configuration UE is sent SRS by which kind of mode; Wireless channel communication environments between these and base station and UE, the distance of UE and base station, the quantity etc. that the UE of SRS is sent in request in the sub-district all has much relations.For example, macrocyclic SRS is very little to the channel estimation errors of UE uplink SRS during the UE walking, and during the operation of UE high speed, because wireless channel environment significantly variation in time, macrocyclic SRS is obvious to the channel estimation errors of UE uplink SRS; In addition, adopt many UE SRS of the code division multiplexing that different circulation time shifts (CS) make up, because the influence of radio propagation channel multipath, the numeral between UE no longer keeps quadrature, has different interference between UE, this disturb along with the UE number of code division multiplexing what and different; Once more; Because the UE uplink transmission power is limited; When UE has sent SRS with maximum power, when the SRS signal to noise ratio that base station side receives still was lower than control target, UE can adopt the arrowband frequency hopping to come the enhanced uplink transmitted power; Improve the signal to noise ratio of base station receiver side SRS, improve the channel estimation errors of uplink SRS.In the TD-LTE system, the channel estimating that descending beam shape-endowing weight value is based on uplink SRS is come according to the certain criterion estimation, the whether accurate throughput that has a strong impact on cell downlink of downlink wave beam inborn nature.In order to improve descending cell throughout, according to the wireless propagation environment between UE and base station, the adaptive real-time adjustment SRS parameter of UE separately is a kind of good selection.
Existing standard has just provided the various configurations mode that SRS supports; Also there are not at present related application and document to set foot in the number of sending the UE of SRS according to wireless propagation environment between UE and base station and request; Based on the throughput-maximized criterion of cell downlink; Take all factors into consideration above-mentioned different factor, the adaptive scheduling in base station and dispose the method for each UE SRS resource.
Summary of the invention
Sign in this; The invention provides a kind of ascending channel detecting pilot frequency self-adapting dispatching method; This method under the situation of the quantity and the wireless channel environment between UE and base station that take into full account scheduling UE, adaptive scheduling and dispose the SRS parameter of each UE, the downlink throughput capacity of maximization sub-district.This invention provides a kind of method of real network operation to the adaptive scheduling of ascending channel detecting pilot frequency.
Operation principle of the present invention is the letter interference ratio of the UE SRS signal that receives of the base station Doppler frequency shift of monitoring uplink UE in real time, base station side; And the UE quantity of sending SRS; Consider the translational speed of UE; Limited SRS cycle, code division multiplexing coefficient and the different frequency hopping bandwidth different with UE SRS of UE transmitted power is to the Different Effects of uplink SRS channel estimation errors; According to condition of different is the different SRS parameter of UE configuration of appointment, minimizes uplink SRS channel estimation errors and maximization cell downlink throughput with this.
The key step that this scheme comprises is following: at first, the reference pilot of up PUSCH of each UE of base station monitors or PUCCH channel according to the autocorrelation between the pilot tone of different time-gap, is estimated the translational speed of each UE; Secondly, channel estimating is done according to the pilot tone RS of each UE ascending channel detecting pilot frequency SRS or upstream data shared channel PUSCH in the base station, estimates the SINR (Signal Interference and Noise Ratio) of the up reception signal of each UE; Once more, the UEUE number of base station statistics application transmission SRS; Next, whether comprehensive these information in base station reach control target with UE by reception SINR and are divided into two types, and UE receives the preferential employing arrowband frequency-hopping mode that SINR does not reach control target, and UE receives the preferential employing broadband mode that SINR reaches control target.UE in the arrowband frequency-hopping mode, according to this type of UE what with and the size of Doppler frequency shift with receive SINR and divide cyclic shift different under the basic sequence (CS) with the no frequency hopping bandwidth of the big or small employing of the difference of control target, different SRS cycles, different code division multiplexing coefficient and same code.UE in broadband mode according to this type of UE what with and the size of Doppler frequency shift adopt different cyclic shift (CS) under no SRS cycle and code division multiplexing coefficient and the same base sequence.In view of the above, immediately dispatch and dispose the transmission SRS parameter of all UE that need send the sounding channel pilot tone effectively, satisfy the maximum validation of resource ground and utilize, to minimize uplink SRS channel estimation errors and maximization cell downlink throughput.
Concrete technical scheme of the present invention is following:
A kind of self-adapting dispatching method of uplink SRS, this method comprises the steps:
Step 1: translational speed or the Doppler frequency shift of estimating this UE according to the up RS of PUSCH that specifies UE or PUCCH.
This step comprises following three sub-steps:
Step 1-1: suppose H (k, s, m, a) expression slot s, subframe m, subcarrier k, the PUSCH of antenna a or the channel estimating of PUCCH, if the up number of reception antenna altogether is A, total number of sub-carriers is K, then the correlation function of subframe m time slot 0 and time slot 1 is: R Δ l ( m ) = 1 A Σ a = 0 A - 1 1 K Σ k = 0 K - 1 H ( k , 0 , m , a ) H * ( k , 1 , m , a )
Wherein, R Δ l(m) differ the mean value that the channel between the time slot of Δ l OFDM symbol is correlated with in the expression subframe m on two times;
Step 1-2: with R Δ l(m) level and smooth between a plurality of subframes, suppose that smoothing factor is p＜1, then,
R ‾ Δl ( m ) = p * R ‾ Δl ( m - 1 ) + ( 1 - p ) * R Δl ( m ) ;
Step 1-3: utilize the channel correlation function Relation with the translational speed of UE
Figure BDA0000159447580000054
Get the Doppler frequency shift f of UE dSo the estimating speed of UE does
Figure BDA0000159447580000055
J wherein 0Be zero Bessel function, c is the light velocity, f cBe the base station center carrier frequency;
Method according to the correlation function derivation UE translational speed between channel time slot between UE and base station has multiple; Can estimate the Doppler frequency shift of UE based on the zero passage point value first time of the zero Bessel function of revising; Also can utilize the relation of Bessel function and Doppler frequency shift to carry out the Doppler frequency shift that interpolation is estimated UE, again according to the translational speed of the Doppler frequency shift derivation UE of UE.
Step 2: channel estimating is carried out based on the upstream data shared channel PUSCH of UE or pilot tone RS or the uplink SRS of ascending control channel PUCCH in the base station, obtains uplink UE and receives the SINR estimated value;
Step 3: the base station is according to the translational speed V of UE UEWith the SINR of base station reception UE, UE is divided three classes: category-A is lower than v for UE speed ThAnd UE receives SINR and is not less than control target SINR TargetCategory-B is lower than v for UE speed ThAnd receive SINR less than control target SINR TargetThe C class is higher than v for UE speed ThThe base station is according to the UE number of different classification of UE and application SRS scheduling, the uplink SRS resource of distributing and dispatching each UE respectively.
Step 3 comprises following 4 sub-steps:
Step 3-1: for C class UE; Because its translational speed is too high; Become too fast during wireless channel, have reciprocity based on the up-downgoing channel, the hypothesis prerequisite of the down beam shaping power that generates according to the spatial coherence of uplink SRS channel is no longer set up; The descending transmission of UE will switch to transmission diversity or the big transmission mode that postpones of circulation this moment, no longer consider the SRS scheduling of such UE;
Step 3-2: for the sub-district of having only category-A UE, be example with the TD-LTE system, when being no more than 2 UE SRS, configuration T Srs=5ms, M Cdm=1 (T SrsFor SRS sends cycle, M CdmBe the code division multiplexing coefficient); When being no more than 4 UE SRS, configuration T Srs=5ms, M Cdm=4 and UE between the circulation time shift keep big as far as possible; When being no more than 16 UE SRS, for middle low speed UE configuration T Srs=10ms, M Cdm=4; For high speed UE configuration T Srs=10ms, M Cdm=8; When being no more than 32 UE SRS, for middle low speed UE configuration T Srs=20ms, M Cdm=4; For high speed UE configuration T Srs=20ms, M Cdm=8; When being no more than 64 UE SRS, for middle low speed UE configuration T Srs=40ms, M Cdm=4; For high speed UE configuration T Srs=20ms, M Cdm=8; When being no more than 128 UE SRS, for middle low speed UE configuration T Srs=40ms, M Cdm=4, b Hop=1/2 (b HopBe the frequency hopping coefficient, half of 1/2 expression full bandwidth); For high speed UE configuration T Srs=20ms, M Cdm=8, b Hop=1/2; When being no more than 256 UE SRS, for middle low speed UE configuration T Srs=40ms, M Cdm=8, b Hop=1/2; For high speed UE configuration T Srs=20ms, M Cdm=8, b Hop=1/4; When surpassing 256 UE SRS, adopt T Srs=40ms, M Cdm=8, b Hop=1/4.Above-mentioned b HopThe wide part of filled band during expression frequency hopping bandwidth.
Step 3-3:, preferentially adopt the arrowband frequency hopping to come power to strengthen for the category-B UE that is in the edge, sub-district.Reception SINR and target value difference Dif as UE Ab≤3dB preferentially adopts 1/2 frequency hopping, and promptly the UE number is no more than at 4 o'clock, adopts T Srs=5ms, M Cdm=1, b Hop=1/2; The UE number is no more than at 16 o'clock, adopts T Srs=5ms, M Cdm=4, b Hop=1/2; The UE number is no more than at 32 o'clock, adopts T Srs=5ms, M Cdm=8, b Hop=1/2; The UE number is no more than at 64 o'clock, adopts T Srs=10ms, M Cdm=8, b Hop=1/2; The UE number is no more than at 128 o'clock, adopts T Srs=10ms, M Cdm=8, b Hop=1/4.Reception SINR and target value difference 3＜Dif as UE AbDuring≤6dB, preferential 1/4 frequency hopping that adopts during low speed, preferential 1/2 frequency hopping that adopts during middling speed, promptly the UE number is no more than at 8 o'clock, adopts T Srs=5ms, M Cdm=1, b Hop=1/4; The UE number is no more than at 32 o'clock, adopts T Srs=5ms, M Cdm=4, b Hop=1/4; The UE number is no more than at 64 o'clock, adopts T Srs=5ms, M Cdm=8, b Hop=1/4; The UE number is no more than at 128 o'clock, adopts T Srs=10ms, M Cdm=8, b Hop=1/4.
Step 3-4: the sub-district that category-B UE is arranged again for existing category-A UE; Based on sub-district maximize throughput criterion; Preferentially select priority scheduling and configuration low speed UE according to scheduling and the equipping rules of category-B UE SRS, according to principle scheduling and the configuration middling speed UE of category-A UE, middling speed UE is the short SRS cycle T of configuration as far as possible SRS, the UE of power limited preferentially adopts frequency-hopping mode to strengthen time domain transmitting power.
The estimation to the UE translational speed in the said step 1 preferentially utilizes the RS pilot tone on the up shared data channel of the UE PUSCH, has only current subframe just to adopt when the PUSCH of this UE does not send and carries the periodically RS pilot tone of the up PUCCH of control information of UE.In addition, the estimation to the UE translational speed in the step 1 is in some cycles, to accomplish, for example 40ms or longer.In order to obtain stable UE moving speed estimation, the estimating speed of UE need carry out smothing filtering between subframe.
In the step 2, can be to the estimation of UE upstream sinr based on the ascending control channel PUCCH of UE transmission, up shared data channel PUSCH or ascending channel detecting pilot frequency SRS, the three has the different power control target respectively.
In the step 3, SRS power control target has individual scope, because of coverage radius of cell different and slightly different with loaded service, the described speed threshold v of step 3 in addition ThCan obtain through the off-line link simulation.
Among the step 3-1; For high-speed mobile UE, the up-downgoing channel is satisfying reciprocity no longer, will bring great error based on the downlink wave beam inborn nature that the channel estimating of SRS produces; The inapplicable wave beam inborn nature of such UE downlink transfer; Base station side is no longer considered to distribute ascending channel detecting pilot frequency SRS to this UE, with adaptive other transmission mode that switches to, as sending the big space division multiplexing that postpones of classification or circulation.
Among the step 3-2, to the scheduling of category-A UE, defining from the off-line link simulation of low speed and middling speed can obtain.According to the relation of Doppler frequency shift and UE translational speed, the UE translational speed is also relevant with the operating frequency of system to the influence of scheduling.In addition, when the number of UE needn't take 8 circulation time shifts,, distribute the circulation time shift of each UE should keep big as far as possible at interval in order to reduce the interference between UE.
Among the step 3-3, to the scheduling of category-B UE, step 6 has only provided a kind of example, and the SRS of UE can also adopt narrower subband hopping to obtain transmitted power bigger on the respective sub-bands as required.
Among the step 3-4, in the actual operation of LTE system, category-A and category-B UE coexistence are big probability events.Category-A still is the category-B priority scheduling according to different measurement criterions and difference.The scheduling of category-A and category-B UE can be one and repeatedly optimize the process of coordinating repeatedly.
The present invention compares the beneficial effect that is had with prior art:
1. taken all factors into consideration the different code division multiplexing coefficient between UE in the adaptive scheduling of the present invention to UE SRS, between UE between different frequency hopping bandwidth and UE different SRS cycle the difference that Different Effects and this influence of uplink SRS channel estimation errors brings downlink wave beam inborn nature performance is worsened;
2. the present invention sends the UE number of SRS and the wireless propagation environment between UE and base station to also having taken all factors into consideration in the adaptive scheduling of UE SRS;
3. the invention allows for the method for in the LTE system, effectively estimating the UE translational speed;
4. the self adaptation concocting method of ascending channel detecting pilot frequency not only is suitable for the TD-LTE system among the present invention; Also be suitable for the TD-LTE-A system, the wave beam forming that said down beam shaping comprises single current list UE also comprises the wave beam forming of the single UE of multithread and the wave beam forming of many UE multithread.
Description of drawings
Fig. 1 executes in the example adaptive scheduling flow chart of uplink SRS in the LTE system for the present invention;
Fig. 2 is the flow chart of UE velocity estimation in the LTE system in the embodiment of the invention;
Fig. 3 is the flow chart that the SRS of category-A UE dispatches in the LTE system in the embodiment of the invention;
Fig. 4 is the flow chart that the SRS of category-B UE dispatches in the LTE system in the embodiment of the invention.
Embodiment
In order more clearly to illustrate the object of the invention, technical scheme and advantage, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is done further detailed description.
Core concept of the present invention is that the base station monitors the signal quality of the UE that the Doppler frequency shift of uplink UE, base station side receive in real time; And the UE quantity of SRS is sent in request; Whether limited the translational speed of comprehensive consideration UE, UE transmitted power SRS cycle, code division multiplexing coefficient and the different frequency hopping bandwidth different with UE to the Different Effects of uplink SRS channel estimation errors; Be the different SRS parameter of UE configuration of appointment, minimize uplink SRS channel estimation errors and maximization cell downlink throughput with this.
Below in conjunction with accompanying drawing, embodiment of the present invention or method are described in detail.
Execution mode
A kind of self-adapting dispatching method of ascending channel detecting pilot frequency referring to Fig. 1, may further comprise the steps:
The UE number of A, base station statistics application SRS scheduling is also estimated its translational speed;
The SINR of B, each UE signal that receives of base station estimation;
C, base station distribute the SRS of uplink SRS resource, control and each UE of scheduling of each UE to send according to the SINR of the signal of the translational speed of the UE of application SRS scheduling and this UE that base station side receives and the difference of controlled target SINR respectively to the UE classification and according to the classification and the UE number of application SRS scheduling.
Said steps A is referring to Fig. 2, shown in comprise following substep:
The PUSCH of appointment UE or the up reference pilot signal of PUCCH are extracted in A1, base station on frequency domain, preferentially adopt the uplink reference signals RS on the UEPUSCH;
Correlation function R (m) between the time slot of A2, the PUSCH that calculates appointment UE or the RS channel estimating on the PUCCH;
Suppose H (k, s, m, a) expression s time slot; The m subframe, the k subcarrier, on a antenna based on the channel estimating of the reference signal of PUSCH or PUCCH, if the up number of reception antenna altogether is A; Total number of sub-carriers is K, and then in the TD-LTE system, the time slot 0 of subframe m and the correlation function of time slot 1 are:
R Δl ( m ) = 1 A Σ a = 0 A - 1 1 K Σ k = 0 K - 1 H ( k , 0 , m , a ) H * ( k , 1 , m , a )
Wherein, R Δ l(m) differ the mean value that the channel between the time slot of Δ l OFDM symbol is correlated with in the expression subframe m on two times;
A3, with R Δ l(m) level and smooth between a plurality of subframes, suppose that smoothing factor is p＜1, then,
R ‾ Δl ( m ) = p * R ‾ Δl ( m - 1 ) + ( 1 - p ) * R Δl ( m ) ;
A4, utilize the channel correlation function
Figure BDA0000159447580000103
Relation with the translational speed of UE
Figure BDA0000159447580000104
Get the Doppler frequency shift f of UE dSo, the estimating speed of UE
Figure BDA0000159447580000105
J wherein 0Be zero Bessel function, c is the light velocity, f cBe the base station center carrier frequency.
Said step B comprises: the uplink channel estimation of UE calculates the reception Signal Interference and Noise Ratio SINR of UE based on the PUSCH of UE or RS or the SRS of PUCCH according to the uplink channel estimation result of each UE.
Said step C comprises following substep:
Step C1: be not higher than the UE of thresholding for translational speed, whether the base station reaches the desired value that presets according to the translational speed of each UE and their SINR is divided three classes UE, and the category-A UE that base station up reception SINR does not reach desired value preferentially adopts the arrowband frequency-hopping mode; Base station up reception SINR reaches the category-B UE that presets desired value and preferentially adopts broadband mode; The C class UE that translational speed surpasses thresholding is with the distribution SRS resource of lowest priority or be not assigned with the SRS resource, or such UE switched to send divides collection or the big transmission mode that postpones of circulation.
Step C2: the category-A UE in the arrowband frequency-hopping mode, according to this type of UE what with and the size of Doppler frequency shift with receive RX SINRAdopt different cyclic shift (CS) under no frequency hopping bandwidth, SRS cycle and code division multiplexing coefficient and the same base sequence with the difference size of control target;
Step C3: the category-B UE in broadband mode, according to this type of UE what with and the size of Doppler frequency shift adopt different cyclic shift (CS) under no SRS cycle and code division multiplexing coefficient and the same base sequence;
Step C4: the sub-district that category-B UE is arranged again for existing category-A UE; The base station can be based on maximum downstream throughput principle priority scheduling category-A UE; Also can be based on poll principle equity dispatching category-A and category-B UE; Also can also be based on WRR packet scheduling strategy scheduling category-A and category-B UE based on the scheduling category-A and the category-B UE of Proportional Fair principle equal proportion;
Step C5: in view of the above, the transmission SRS parameter of all UE that need send the sounding channel pilot tone is dispatched and disposed in the base station immediately effectively, satisfies the maximum validation of resource ground and utilize, to minimize uplink SRS channel estimation errors and maximization cell downlink throughput.
For further introducing the present invention, set forth respectively below in conjunction with Fig. 3 and Fig. 4, symbol T among the figure, CDM and Hop are equal to following symbol T respectively Srs, M CdmAnd b Hop
Suppose the up RX of the UE of request transmission SRS SINRCan both reach desired value, and the UE number is N.The UE number N here can be arbitrary value, is recommended as and is not more than 256 arbitrary value.
As shown in Figure 3, when N≤2, the base station disposes the SRS cycle T of NUE respectively Srs, code division multiplexing coefficient M CdmWith frequency hopping coefficient b HopBe T Srs=5ms, M Cdm=1, b Hop=1 (b HopBe that 1 expression filled band is wide, 1/2 expression half-band width); When N≤8, configuration T Srs=5ms, M Cdm=4, b Hop=1; When N≤16, for low speed UE configuration T Srs=10ms, M Cdm=4, b Hop=1; For high speed UE configuration T Srs=5ms, M Cdm=8, b Hop=1; When N≤32, for low speed UE configuration T Srs=20ms, M Cdm=4, b Hop=1; For high speed UE configuration T Srs=10ms, M Cdm=8, b Hop=1; When N≤64, for low speed UE configuration T Srs=40ms, M Cdm=4, b Hop=1; For high speed UE configuration T Srs=20ms, M Cdm=8, b Hop=1; When N≤128, dispose for low speed UE
Figure BDA0000159447580000121
For high speed UE configuration T Srs=20ms, M Cdm=8, When N≤256, for low speed UE configuration T Srs=40ms, M Cdm=8,
Figure BDA0000159447580000124
For high speed UE configuration T Srs=20ms, M Cdm=8,
Figure BDA0000159447580000125
Suppose the up RX of the UE of request transmission SRS SINRAll can not reach desired value, and the UE number is N, the UE number N here can be arbitrary value, is recommended as and is not more than 256 arbitrary value.
As shown in Figure 4, when N≤4, the base station disposes the SRS cycle T of NUE respectively Srs, code division multiplexing coefficient M CdmWith frequency hopping coefficient b HopBe T Srs=5ms, M Cdm=1,
Figure BDA0000159447580000126
(b HopBe that 1 expression filled band is wide, 1/2 expression half-band width); When N≤16, configuration T Srs=5ms, M Cdm=4,
Figure BDA0000159447580000127
When N≤32, configuration T Srs=5ms, M Cdm=8,
Figure BDA0000159447580000128
When N≤64, configuration T Srs=10ms, M Cdm=8,
Figure BDA0000159447580000129
When N≤128, configuration T Srs=20ms, M Cdm=8,
Figure BDA00001594475800001210
When N≤256, configuration T Srs=40ms, M Cdm=8,
Figure BDA00001594475800001211
Suppose the up RX of the UE of request transmission SRS SINRCan reach the U of desired value aNumber is N a, low speed U wherein Lv_a1Number N A1, middling speed U Mv_a2Number N A2RX SINRCan not reach the U of desired value bNumber is N-N a, low speed U Lv_b1Number N B1, middling speed U Mv_b2Number N B2The UE number N here can be arbitrary value, is recommended as and is not more than 256 arbitrary value.
At this moment, select priority scheduling and configuration low speed U according to scheduling and the equipping rules of category-B UE SRS Lv_a1And U Lv_b1, according to principle scheduling and the configuration middling speed U of category-A UE Mv_b2And U Mv_a2, middling speed UE is the short SRS cycle T of configuration as far as possible SRS, the U of power limited bThe preferential frequency-hopping mode that adopts strengthens time domain transmitting power.
So far, accomplish category-A UE, category-B UE, the SRS adaptive scheduling of category-A and category-B mixing UE also finishes the adaptive scheduling of present embodiment ascending channel detecting pilot frequency.

Claims (8)

1. the self-adapting dispatching method of an ascending channel detecting pilot frequency is characterized in that, this method may further comprise the steps:
The UE number of A, base station statistics application SRS scheduling is also estimated its translational speed;
The SINR of B, each UE signal that receives of base station estimation;
C, base station distribute the SRS of uplink SRS resource, control and each UE of scheduling of each UE to send according to the SINR of the signal of the translational speed of the UE of application SRS scheduling and this UE that base station side receives and the difference of controlled target SINR respectively to the UE classification and according to the classification and the UE number of application SRS scheduling.
2. method according to claim 1 is characterized in that, said steps A comprises:
The PUSCH of appointment UE or the up reference pilot signal of PUCCH are extracted in A1, base station on frequency domain,
The preferential uplink reference signals RS that adopts on the UEPUSCH;
Correlation function R (m) between the time slot of A2, the PUSCH that calculates appointment UE or the RS channel estimating on the PUCCH;
Suppose H (k, s, m, a) expression s time slot; The m subframe, the k subcarrier, on a antenna based on the channel estimating of the reference signal of PUSCH or PUCCH, if the up number of reception antenna altogether is A; Total number of sub-carriers is K, and then in the TD-LTE system, the time slot 0 of subframe m and the correlation function of time slot 1 are:
Figure DEST_PATH_FDA0000175285051
Wherein, R Δ l(m) differ the mean value that the channel between the time slot of Δ l OFDM symbol is correlated with in the expression subframe m on two times;
A3, with R Δ l(m) level and smooth between a plurality of subframes, suppose that smoothing factor is p<1, then,
A4, utilize the channel correlation function
Figure DEST_PATH_FDA0000175285053
Relation with the translational speed of UE , the Doppler frequency shift f of UE dSo, the estimating speed of UE , J wherein 0Be zero Bessel function, c is the light velocity, f cBe the base station center carrier frequency.
3. method according to claim 1 is characterized in that, said step B comprises:
The uplink channel estimation of UE calculates the reception Signal Interference and Noise Ratio SINR of UE based on the PUSCH of UE or RS or the SRS of PUCCH according to the uplink channel estimation result of each UE.
4. method according to claim 1 is characterized in that, said step C comprises:
Be higher than the UE that ascending channel detecting pilot frequency SRS is sent in the request of presetting thresholding for translational speed, its transmission mode to transmission diversity or circulation delay CDD will be switched in the base station; Be not higher than the UE of thresholding for translational speed, whether the base station reaches the desired value that presets according to the translational speed of each UE and their SINR is divided three classes UE, and the category-A UE that base station up reception SINR does not reach desired value preferentially adopts the arrowband frequency-hopping mode; Base station up reception SINR reaches the category-B UE that presets desired value and preferentially adopts broadband mode, and the C class UE that translational speed surpasses thresholding is with the distribution SRS resource of lowest priority or be not assigned with the SRS resource;
UE in the arrowband frequency-hopping mode, according to the number of this type of UE with and the size of translational speed and base station receive different CS (cyclic shift) under the employing of difference size no frequency hopping bandwidth, SRS cycle and the code division multiplexing coefficient and the same base sequence of SINR and control target; UE in broadband mode according to the number of this type of UE with and the size of translational speed adopt different CS under no SRS cycle, code division multiplexing coefficient and the same base sequence; In view of the above; The instant transmission SRS parameter of dispatching and dispose all UE that need send the sounding channel pilot tone effectively; The maximum validation ground that satisfies the ascending channel detecting pilot frequency resource utilizes, to minimize uplink SRS channel estimation errors and maximization cell downlink throughput.
5. the method for the adaptive scheduling of the ascending channel detecting pilot frequency of stating according to claim 1 is characterized in that also comprise: the SRS of UE can only be configured in last OFDM symbol of sub-frame of uplink in the LTE system; According to the channel conditions between UE and base station, the resource of each UE ascending channel detecting pilot frequency on frequency domain, time domain and sign indicating number territory dynamically distributed in the base station.
6. the estimation of UE translational speed according to claim 2; It is characterized in that; Also comprise: the zero passage point value first time that the channel correlation function between UE and base station time slot can also be based on the zero Bessel function of correction to the mapping relations of UE translational speed is estimated the Doppler frequency shift of UE; Also can be to utilize the relation of Bessel function and Doppler frequency shift to carry out the Doppler frequency shift that interpolation is estimated UE, derive the speed of UE again according to the Doppler frequency shift of UE.
7. the process of transmitting of the base stations control according to claim 4 and the ascending channel detecting pilot frequency of each UE equipment of scheduling; It is characterized in that; Also comprise: when comprising the scheduling of category-A and category-B UE in the sub-district simultaneously; Priority scheduling category-A UE, the distribution of category-A UE and category-B UE SRS resource also need be based on repetitious the coordination between UE and optimization under the maximized principle of downlink throughput capacity.
8. according to described each method of claim 1 to 7, it is characterized in that, also comprise:
Each UE appliance services grade of base station monitors; Preferential to the high UE devices allocation uplink SRS resource of the grade of service, perhaps the scheduling of the uplink SRS of preferential that the grade of service is high UE is arranged in and helps improving on the ascending channel detecting pilot frequency resource of SRS channel estimating quality.
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