CN104219770B - LTE system downlink dispatching method and device - Google Patents

LTE system downlink dispatching method and device Download PDF

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CN104219770B
CN104219770B CN201310211037.4A CN201310211037A CN104219770B CN 104219770 B CN104219770 B CN 104219770B CN 201310211037 A CN201310211037 A CN 201310211037A CN 104219770 B CN104219770 B CN 104219770B
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resource block
information
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CN104219770A (en
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刘洋
杨姗
陈鹏
佘小明
蒋峥
李欣
赵嵩
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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Abstract

The present invention discloses a kind of LTE system downlink dispatching method and device.Wherein in LTE system downlink dispatching method, when intra-cell users feed back PMI and/or RI, the pre-coding matrix historical information of intra-cell users is generated, updates the precoding matrix information of intra-cell users.Judge whether pre-coding matrix historical informations of the user k on i-th of resource block and precoding matrix information current on i-th of resource block user k are identical, if both are different, equitable proportion modifying factors of the user k on i-th of resource block is the normal number less than 1.Calculate the equitable proportion factors of the user k on i-th of resource block, priority of the generation user k on i-th of resource block.For each resource block, the user for selecting priority maximum is scheduled.Thus it can prevent the change of this community user pre-coding matrix from producing excessive influence to the Signal to Interference plus Noise Ratio result of calculation of neighbor cell user, and ensure the fairness between user.

Description

LTE system downlink dispatching method and device
Technical field
The present invention relates to the communications field, more particularly to a kind of LTE（Long Term Evolution, Long Term Evolution）System Downlink dispatching method and device.
Background technology
In LTE system, when dynamic dispatching exactly will be most suitable, frequency, null resource distribute to some user, are to realize One of important guarantee of LTE system multi-user diversity gain, the overall performance of system is largely determined, so scheduling Technology is considered as the core technology in LTE system, in communication process, the limited bandwidth resources of multiple users to share, how Resource is distributed between user, the problem of whether justice first has to consider as dispatching technique distributed.
At present, dispatching algorithm more conventional in LTE system is equitable proportion（Proportional Fair, referred to as：PF） Dispatching algorithm.For example, in one kind in the prior art, utilize the ACK of user feedback（Acknowledgement, confirm response）/ NACK（Negative Acknowledgement, negative response）Information, situation dynamic is retransmitted according to current time system business Adjustresources distribute.But the prior art does not account for the situation of change using channel quality, it is impossible to according to channel quality The adaptive regulating system fairness of change and throughput, so as to which the proportional fair scheduling of the prior art optimization can not Effective optimum choice of sector throughput and service fairness is provided.
At another in the prior art, scheduling instance and the peak transfer rate and average transmission of previous moment speed are utilized Rate information, the size of adaptive adjustment scheduling priority factor；Either utilize the different target rate of user's different business Scope, with suitable for mixed service, but the prior art does not account for descending interference caused by multiple cell is independently dispatched and become Change.
A kind of prior art also be present, the variations situation undergone according to each user, utilize what is be calculated The adjustment dispatching priority size of user's rate adaptive transmission, still, the prior art is also without in view of user feedback Channel quality and user the channel quality of experience be present inconsistent, can so cause the meter of user's transmission rate Do not calculate accurately really.
A kind of in addition, conventional UE（User Equipment, user equipment）Side CQI（Channel Quality Indicator, channel quality instruction）Estimation scheme, it is that interference covariance is averaged after UE sides are to detection, estimates UE accordingly May be interfered size, if but because the interference equivalent channel change of neighbor cell is too fast, this scheme can not Improve the CQI of feedback reliability.
3GPP（The3rd Generation Partnership Project, third generation partner program）LTE protocol Mention, based on CRS（Common Reference Signal, public reference signal）CQI measurement when, pass through upper-layer configured ΔoffsetTo carry out CQI adjustment, the scope of CQI feedback value can be adjusted by this mode, but still has problems with：
1.ΔoffsetMain purpose is in order to from CRS SINR（Signal to Interference plus Noise Ratio, Signal to Interference plus Noise Ratio）Estimation uses DRS（Dedicated Reference Signal, DRS (Dedicated Reference Signal)）Reality SINR, it is applied only to TM8/TM9 transmission modes in LTE system；
2. a cell becomes very sensitive to the small-scale disturbance of adjacent cell because of the presence of precoding, semi-static by upper strata It is not high to configure real-time；
3. ΔoffsetIt is broadband value, so as configuration subband feedback PMI（Precoding Matrix Indicator, in advance Encoder matrix indicates）When, do not reach and select gain frequently well.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of LTE system downlink dispatching method and device.This can be reduced Influence of the scheduling of cell to the interference variations of other community users, the accuracy of all community user scheduling is improved, so as to carry Rise systematic entirety energy.
According to an aspect of the present invention, there is provided a kind of LTE system downlink dispatching method, including：
Receiving intra-cell users feeding back precoding matrix configured information PMI and/or rank indication information RI acquisition of information Moment, the extraction intra-cell users precoding matrix information associated with the preceding n acquisition of information moment；
Using the intra-cell users precoding matrix information associated with the preceding n acquisition of information moment, used in generation cell The pre-coding matrix historical information at family；
Update the precoding matrix information of intra-cell users, the current precoding matrix information of storage intra-cell users with Current information obtains the incidence relation at moment；
Judge that pre-coding matrix historical informations of the user k on i-th of resource block is taken in user k in i-th of resource block Whether preceding precoding matrix information is identical；
If pre-coding matrix historical informations of the user k on i-th of resource block and user k are current on i-th of resource block Precoding matrix information differ, then equitable proportion modifying factor αs of the user k on i-th of resource blockk,iIt is for β, wherein β Normal number less than 1；
According to channel quality indication (CQI) information CQIs of the user k on i-th of resource blockk,i, and user k average transmission speed Rate rk, calculate equitable proportion factor fs of the user k on i-th of resource blockk,i；
Utilize equitable proportion factor fs of the user k on i-th of resource blockk,i, ratios of the user k on i-th of resource block Fair modifying factor αk,i, obtain priority of the user k on i-th of resource block
For each resource block, the user for selecting priority maximum is scheduled.
Preferably, if pre-coding matrix historical informations of the user k on i-th of resource block and user k are in i-th of resource block Upper current precoding matrix information is identical, then equitable proportion modifying factor αs of the user k on i-th of resource blockk,iFor 1；
Then perform and utilize equitable proportion factor f of the user k on i-th of resource blockk,i, user k is in i-th of resource block On equitable proportion modifying factor αk,i, obtain priority of the user k on i-th of resource blockThe step of.
Preferably, the equitable proportion factor f using user k on i-th of resource blockk,i, user k is on i-th of resource block Equitable proportion modifying factor αk,i, obtain priority of the user k on i-th of resource blockThe step of include：
Preferably, the step of precoding matrix information for updating intra-cell users, includes：
Precoding matrix information RP current on i-th of resource block user kk,iFor：
RPk,i=RIk,i×l+PMIk,i
Wherein RIk,iFor rank indication informations of the user k on i-th of resource block, PMIk,iIt is user k in i-th of resource block On pre-coding matrix instruction information, l is precoding sample number.
Preferably, the channel quality indication (CQI) information CQI according to user k on i-th of resource blockk,i, and user k's is flat Equal transmission rate rk, calculate equitable proportion factor fs of the user k on i-th of resource blockk,iThe step of include：
Equitable proportion factor fs of the user k on i-th of resource blockk,iFor：
According to another aspect of the present invention, there is provided a kind of LTE system descending scheduling device, including receiving unit, information carry Take unit, pre-coding matrix historical information generation unit, updating block, recognition unit, modifying factor setting unit, equitable proportion Factor calculating unit, priority calculation unit, scheduling unit, incidence relation memory cell, wherein：
Receiving unit, for receiving the pre-coding matrix instruction information PMI and/or rank indication information of intra-cell users feedback RI；
Information extraction unit, for receiving intra-cell users feeding back precoding matrix configured information PMI in receiving unit And/or the rank indication information RI acquisition of information moment, extracted from incidence relation memory cell related to the preceding n acquisition of information moment The intra-cell users precoding matrix information of connection；
Pre-coding matrix historical information generation unit, for using in the cell associated with the preceding n acquisition of information moment User's precoding matrix information, generate the pre-coding matrix historical information of intra-cell users；
Updating block, for updating the precoding matrix information of intra-cell users, by the current precoding of intra-cell users The incidence relation that matrix information obtains the moment with current information is stored in incidence relation memory cell；
Recognition unit, for judging pre-coding matrix historical informations of the user k on i-th of resource block with user k i-th Whether current precoding matrix information is identical on individual resource block；
Modifying factor setting unit, for the judged result according to recognition unit, if user k is on i-th of resource block The pre-coding matrix historical information precoding matrix information current on i-th of resource block with user k differs, then user k exists Equitable proportion modifying factor α on i-th of resource blockk,iFor β, wherein β is the normal number less than 1；
Equitable proportion factor calculating unit, for the channel quality indication (CQI) information according to user k on i-th of resource block CQIk,i, and user k average transmission rate rk, calculate equitable proportion factor fs of the user k on i-th of resource blockk,i；
Priority calculation unit, for the equitable proportion factor f using user k on i-th of resource blockk,i, user k exists Equitable proportion modifying factor α on i-th of resource blockk,i, obtain priority of the user k on i-th of resource block；
Scheduling unit, for for each resource block, the user for selecting priority maximum to be scheduled；
Incidence relation memory cell, during for storing the precoding matrix informations of intra-cell users with corresponding acquisition of information The incidence relation at quarter.
Preferably, modifying factor setting unit is additionally operable to the judged result according to recognition unit, if user k is in i-th of money Pre-coding matrix historical information in source block is identical with the precoding matrix information that user k is current on i-th of resource block, then uses Equitable proportion modifying factor αs of the family k on i-th of resource blockk,iFor 1；Then indicate that priority calculation unit performs and utilize user Equitable proportion factor fs of the k on i-th of resource blockk,i, equitable proportion modifying factor αs of the user k on i-th of resource blockk,i, Obtain priority of the user k on i-th of resource blockOperation.
Preferably, priority calculation unit specifically utilizes formula
Obtain priority of the user k on i-th of resource block, wherein fk,iThe ratio for being user k on i-th of resource block Example fairness index, αk,iThe equitable proportion modifying factor for being user k on i-th of resource block.
Preferably, updating block specifically utilizes formula
RPk,i=RIk,i×l+PMIk,i
Update user k precoding matrix information RP current on i-th of resource blockk,i, wherein RIk,iIt is user k i-th Rank indication information on individual resource block, PMIk,iThe pre-coding matrix instruction information for being user k on i-th of resource block, l is pre- Coded samples number.
Preferably, equitable proportion factor calculating unit specifically utilizes formula
Calculate the equitable proportion factors of the user k on i-th of resource block.
The present invention prevents this community user pre-coding matrix by the influence of the consideration pre-coding matrix when dispatching user Change and excessive influence is produced on the Signal to Interference plus Noise Ratio result of calculation of neighbor cell user so that the channel of neighbor cell user feedback Quality can more characterize it and carve undergone channel quality when called, and ensure that the fairness between user.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the schematic diagram of LTE system downlink dispatching method one embodiment of the present invention.
Fig. 2 is the schematic diagram of LTE system descending scheduling device one embodiment of the present invention.
Fig. 3 is the user throughput CDF of dispatching method of the present invention and dispatching method in the prior art（Cumulative Distribution Function, cumulative distribution function）Figure.
Fig. 4 is the network diagram for realizing the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Below Description only actually at least one exemplary embodiment is illustrative, is never used as to the present invention and its application or makes Any restrictions.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work premise Lower obtained every other embodiment, belongs to the scope of protection of the invention.
Unless specifically stated otherwise, the part and positioned opposite, the digital table of step otherwise illustrated in these embodiments Do not limited the scope of the invention up to formula and numerical value.
Simultaneously, it should be appreciated that for the ease of description, the size of the various pieces shown in accompanying drawing is not according to reality Proportionate relationship draw.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable In the case of, the technology, method and apparatus should be considered as authorizing part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
Fig. 1 is the schematic diagram of LTE system downlink dispatching method one embodiment of the present invention.As shown in figure 1, the present embodiment Method and step is as follows：
Step 101, intra-cell users feeding back precoding matrix configured information PMI and/or rank indication information RI are being received Acquisition of information moment, the extraction intra-cell users precoding matrix information associated with the preceding n acquisition of information moment.
Step 102, the intra-cell users precoding matrix information associated with the preceding n acquisition of information moment, generation are utilized The pre-coding matrix historical information of intra-cell users.
Step 103, the precoding matrix information of intra-cell users, the current pre-coding matrix of storage intra-cell users are updated Information obtains the incidence relation at moment with current information.
Step 104, judge pre-coding matrix historical informations of the user k on i-th of resource block with user k in i-th of money Whether current precoding matrix information is identical in source block.
Step 105, if pre-coding matrix historical informations of the user k on i-th of resource block and user k are in i-th of resource Current precoding matrix information differs on block, then equitable proportion modifying factor αs of the user k on i-th of resource blockk,iFor β, wherein β are the normal number less than 1.
Step 106, the channel quality indication (CQI) information CQI according to user k on i-th of resource blockk,i, and user k's is flat Equal transmission rate rk, calculate equitable proportion factor fs of the user k on i-th of resource blockk,i。
Wherein, can be according to channel quality indication (CQI) information CQIs of the user k on i-th of resource blockk,i, obtain user k institutes energy The average transmission rate r reachedk。CQIk,iRepresent user k SINR corresponding to the CQI of the last feedback on i-th of resource block Value.
Step 107, the equitable proportion factor f using user k on i-th of resource blockk,i, user k is in i-th of resource block On equitable proportion modifying factor αk,i, obtain priority of the user k on i-th of resource block
Step 108, for each resource block, the user for selecting priority maximum is scheduled.
The LTE system downlink dispatching method provided based on the above embodiment of the present invention, it is pre- by considering when dispatching user The influence of encoder matrix, prevent the change of this community user pre-coding matrix is calculated the Signal to Interference plus Noise Ratio of neighbor cell user from producing Excessive influence so that the channel quality of neighbor cell user feedback can more characterize it and carve undergone channel matter when called Amount, and ensure that the fairness between user.
, wherein it is desired to explanation, in above-mentioned steps 101, if n is 1, that is, is utilized and upper acquisition of information moment phase Pre-coding matrix historical information of the intra-cell users precoding matrix information of association as intra-cell users.If n is more than 1, i.e., Handled using the associated intra-cell users precoding matrix information of multiple acquisition of information moment before, to obtain cell The pre-coding matrix historical information of interior user, in this case, it can use at simple average or average weighted mode Reason, nearer from the current information acquisition moment, the weight that can set corresponding information is bigger.
Preferably, in the above-described embodiments, if pre-coding matrix historical informations of the user k on i-th of resource block is with using Precoding matrix information current on i-th of resource block family k is identical, then equitable proportions of the user k on i-th of resource block is repaiied Positive divisor αk,iFor 1.Then perform and utilize equitable proportion factor f of the user k on i-th of resource blockk,i, user k i-th money Equitable proportion modifying factor α in source blockk,i, obtain priority of the user k on i-th of resource blockThe step of.
That is, equitable proportion modifying factor αk,iValue be：
Wherein RPk,iFor user k precoding matrix informations current on i-th of resource block, RP_Hk,iIt is user k i-th Pre-coding matrix historical information on individual resource block.Parameter beta is semi-static constant by upper-layer configured.
Preferably, the above-mentioned equitable proportion factor f using user k on i-th of resource blockk,i, user k is in i-th of resource Equitable proportion modifying factor α on blockk,i, obtain priority of the user k on i-th of resource blockThe step of include：
So as to proportion of utilization justice modifying factor αk,i, can obtain priority of the user k on i-th of resource block
Preferably, the step of precoding matrix information of above-mentioned renewal intra-cell users includes：
Precoding matrix information RP current on i-th of resource block user kk,iFor：
RPk,i=RIk,i×l+PMIk,i
Wherein RIk,iFor rank indication informations of the user k on i-th of resource block, PMIk,iIt is user k in i-th of resource block On pre-coding matrix instruction information, l is precoding sample number.For example, l=16 in 4 antenna.So as to utilize RIk,iAnd PMIk,i Precoding matrix information that can be current on i-th of resource block to user k is updated.
Preferably, the above-mentioned channel quality indication (CQI) information CQI according to user k on i-th of resource blockk,i, and user k Average transmission rate rk, calculate user k includes in the step of equitable proportion factor on i-th of resource block：
Equitable proportion factor fs of the user k on i-th of resource blockk,iFor：
Fig. 2 is the schematic diagram of LTE system descending scheduling device one embodiment of the present invention.As shown in Fig. 2 the device includes Receiving unit 201, information extraction unit 202, pre-coding matrix historical information generation unit 203, updating block 204, identification are single Member 205, modifying factor setting unit 206, equitable proportion factor calculating unit 207, priority calculation unit 208, scheduling unit 209th, incidence relation memory cell 210, wherein：
Receiving unit 201, for receiving the pre-coding matrix instruction information PMI and/or order instruction of intra-cell users feedback Information RI；
Information extraction unit 202, for receiving intra-cell users feeding back precoding matrix configured information in receiving unit The PMI and/or rank indication information RI acquisition of information moment, from when the extraction of incidence relation memory cell 210 and preceding n acquisition of information Carve associated intra-cell users precoding matrix information；
Pre-coding matrix historical information generation unit 203, for utilizing the cell associated with the preceding n acquisition of information moment Interior user's precoding matrix information, generate the pre-coding matrix historical information of intra-cell users；
Updating block 204, for updating the precoding matrix information of intra-cell users, by current pre- of intra-cell users The incidence relation that encoder matrix information obtains the moment with current information is stored in incidence relation memory cell 210；
Recognition unit 205, for judging that pre-coding matrix historical informations of the user k on i-th of resource block exists with user k Whether current precoding matrix information is identical on i-th of resource block；
Modifying factor setting unit 206, for the judged result according to recognition unit 205, if user k is in i-th of resource Pre-coding matrix historical information on the block precoding matrix information current on i-th of resource block with user k differs, then uses Equitable proportion modifying factor αs of the family k on i-th of resource blockk,iFor β, wherein β is the normal number less than 1；
Equitable proportion factor calculating unit 207, for indicating letter according to channel qualities of the user k on i-th of resource block Cease CQIk,i, and user k average transmission rate rk, calculate equitable proportion factor fs of the user k on i-th of resource blockk,i；
Priority calculation unit 208, for the equitable proportion factor f using user k on i-th of resource blockk,i, user k Equitable proportion modifying factor α on i-th of resource blockk,i, obtain priority of the user k on i-th of resource block
Scheduling unit 209, for for each resource block, the user for selecting priority maximum to be scheduled；
Incidence relation memory cell 210, the precoding matrix information for storing intra-cell users obtain with corresponding information Take the incidence relation at moment.
The LTE system descending scheduling device provided based on the above embodiment of the present invention, it is pre- by considering when dispatching user The influence of encoder matrix, prevent the change of this community user pre-coding matrix is calculated the Signal to Interference plus Noise Ratio of neighbor cell user from producing Excessive influence so that the channel quality of neighbor cell user feedback can more characterize it and carve undergone channel matter when called Amount, and ensure that the fairness between user.
Preferably, modifying factor setting unit 206 is additionally operable to the judged result according to recognition unit 205, if user k is Pre-coding matrix historical information on the i resource block precoding matrix information phase current on i-th of resource block with user k Together, then equitable proportion modifying factor αs of the user k on i-th of resource blockk,iFor 1；Then instruction priority calculation unit 208 is held Row utilizes equitable proportion factor fs of the user k on i-th of resource blockk,i, equitable proportions of the user k on i-th of resource block repair Positive divisor αk,i, obtain priority of the user k on i-th of resource blockOperation.
Preferably, priority calculation unit 208 specifically utilizes formula
Obtain priority of the user k on i-th of resource blockWherein fkiThe ratio for being user k on i-th of resource block Example fairness index, αk,iThe equitable proportion modifying factor for being user k on i-th of resource block.
Preferably, updating block 204 specifically utilizes formula
RPk,i=RIk,i×l+PMIk,i
Update user k precoding matrix information RP current on i-th of resource blockk,i, wherein RIk,iIt is user k i-th Rank indication information on individual resource block, PMIk,iThe pre-coding matrix instruction information for being user k on i-th of resource block, l is pre- Coded samples number.
Preferably, equitable proportion factor calculating unit 207 specifically utilizes formula
Calculate the equitable proportion factors of the user k on i-th of resource block.
Below by specific example, present invention is described.It is corresponding imitative for using simulation parameter as shown in table 1 True sector spectrum efficiency is as shown in table 2.
Carrier frequency 2GHz
Bandwidth 10MHz
Sub-carrier number 600
RB bandwidth 180kHz
Subframe lengths 1msec
Topology 6 side shapes, 19 cells, 57 sectors
Number of users 10/ sector
Antenna form 3D antennas, 15 degree of angle of declinations
Station spacing 500m
Transmit power 46dBm
Noise figure 9dB
Large scale fading model COST-Walfish-Ikegami-Model
Penetration loss 20dB
Shade variance 8dB
Shade correlation 0.5 (between standing)/1.0 (in standing)
Channel model SCME
Antenna number 4 hairs 1 are received
Channel estimation It is preferable
Receiver MMSE
Feedback system PUSCH mode3-1
PMI/CQI feedback cycles (delay) 5msec(6msec)
The RI update cycles 100msec
Service source Full buffer traffic
HARQ Chase merges
Table 1
Table 2
It can be seen that, compared with conventional PF algorithms, the selection to this community user carries out the pact of pre-coding matrix from table 2 Beam, sector average throughput improve 42%, and cell edge throughput improves 37%.Another contrast scheme is that user terminal calculates During CQI, the interference covariance of user is averaged in time, this scheme is compared with actual measurement disturbs progress CQI to calculate, energy Certain throughput gain is enough obtained, but performance is worse than the performance of this patent method.
Fig. 3 is that the user throughput CDF of dispatching method of the present invention and dispatching method in the prior art schemes.Can be with from Fig. 3 See, user throughput CDF curves of the invention are substantially better than scheme of the prior art.
Fig. 4 is the network diagram for realizing the present invention.Assuming that in moment t, adjacent cell user UE0 measurement channel qualities CQI0 And base station is fed back to, now this cell scheduling user UE1, and UE1 pre-coding matrix is w1, then UE0 is measured CQI0For：
Wherein H00w0For UE0 signal power,For UE0 noise power, H10w1Jamming power for eNB1 to UE0, C For w0Affiliated domain, argmax refers to by selecting w0Make fraction numerical value maximum below.
In moment t+1, this cell scheduling user UE2, and UE2 pre-coding matrix is w2, then UE0 can undergo channel Quality is：
Wherein H10w2Jamming power for eNB1 to UE0.
Because base station is according to feedback CQI0UE0 modulation coding mode is selected, so：
Work as SINR0＞ CQI0, then base station underestimate the channel quality of user, cause user's transmission rate relatively low；
Work as SINR0＜ CQI0, then base station over-evaluated the channel quality of user, cause user transmission be likely to malfunction；
So after the delay selection scheduling user when, by implement the present invention, consider and prelist when dispatching user The influence of code matrix, that is, the user that deviation selection pre-coding matrix is constant, i.e., meet w as far as possible2=w1.For LTE FDD （Frequency Division Duplexing, FDD）Downlink transfer, due to the small yardstick H of the interference signal of this cell10 Change is slower, therefore disclosure satisfy that condition similar in the feedback CQI and SINR actually undergone, that is, can meet SINR0=CQI0, So as to prevent the change of this community user pre-coding matrix from producing excessive shadow to the interference signal intensity of neighbor cell user Ringing so that the channel quality of neighbor cell user feedback can more characterize it and carve undergone channel quality when called, and It ensure that the fairness between user.
One of ordinary skill in the art will appreciate that hardware can be passed through by realizing all or part of step of above-described embodiment To complete, by program the hardware of correlation can also be instructed to complete, described program can be stored in a kind of computer-readable In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
Description of the invention provides for the sake of example and description, and is not exhaustively or by the present invention It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Select and retouch State embodiment and be to more preferably illustrate the principle and practical application of the present invention, and one of ordinary skill in the art is managed The present invention is solved so as to design the various embodiments with various modifications suitable for special-purpose.

Claims (10)

  1. A kind of 1. LTE system downlink dispatching method, it is characterised in that including：
    Intra-cell users feeding back precoding matrix configured information PMI and/or rank indication information RI the acquisition of information moment are being received, The extraction intra-cell users precoding matrix information associated with the preceding n acquisition of information moment；
    Using the intra-cell users precoding matrix information associated with the preceding n acquisition of information moment, intra-cell users are generated Pre-coding matrix historical information；
    Update the precoding matrix information of intra-cell users, the current precoding matrix information of storage intra-cell users and current letter Breath obtains the incidence relation at moment；
    Judge that pre-coding matrix historical informations of the user k on i-th of resource block and user k are current on i-th of resource block Whether precoding matrix information is identical；
    If pre-coding matrix historical informations of the user k on i-th of resource block and user k are current pre- on i-th of resource block Encoder matrix information differs, then equitable proportion modifying factor αs of the user k on i-th of resource blockk,iFor β, wherein β be less than 1 normal number；
    According to channel quality indication (CQI) information CQIs of the user k on i-th of resource blockk,i, and user k average transmission rate rk, Calculate equitable proportion factor fs of the user k on i-th of resource blockk,i；
    Utilize equitable proportion factor fs of the user k on i-th of resource blockk,i, equitable proportions of the user k on i-th of resource block Modifying factor αk,i, obtain priority of the user k on i-th of resource block
    For each resource block, the user for selecting priority maximum is scheduled.
  2. 2. according to the method for claim 1, it is characterised in that
    If pre-coding matrix historical informations of the user k on i-th of resource block and user k are current pre- on i-th of resource block Encoder matrix information is identical, then equitable proportion modifying factor αs of the user k on i-th of resource blockk,iFor 1；
    Then perform and utilize equitable proportion factor f of the user k on i-th of resource blockk,i, user k is on i-th of resource block Equitable proportion modifying factor αk,i, obtain priority of the user k on i-th of resource blockThe step of.
  3. 3. method according to claim 1 or 2, it is characterised in that
    Utilize equitable proportion factor fs of the user k on i-th of resource blockk,i, equitable proportions of the user k on i-th of resource block Modifying factor αk,i, obtain priority of the user k on i-th of resource blockThe step of include：
    <mrow> <msub> <mover> <mi>f</mi> <mo>&amp;OverBar;</mo> </mover> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>f</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>&amp;times;</mo> <msub> <mi>&amp;alpha;</mi> <mrow> <mi>k</mi> <mo>.</mo> <mi>i</mi> </mrow> </msub> <mo>.</mo> </mrow>
  4. 4. method according to claim 1 or 2, it is characterised in that
    The step of precoding matrix information for updating intra-cell users, includes：
    Precoding matrix information RP current on i-th of resource block user kk,iFor：
    RPk,i=RIk,i×l+PMIk,i
    Wherein RIk,iFor rank indication informations of the user k on i-th of resource block, PMIk,iIt is user k on i-th of resource block Pre-coding matrix instruction information, l are precoding sample number.
  5. 5. method according to claim 1 or 2, it is characterised in that
    According to channel quality indication (CQI) information CQIs of the user k on i-th of resource blockk,i, and user k average transmission rate rk, Calculate equitable proportion factor fs of the user k on i-th of resource blockk,iThe step of include：
    Equitable proportion factor fs of the user k on i-th of resource blockk,iFor：
    <mrow> <msub> <mi>f</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <mi>log</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <msub> <mi>CQI</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> <msub> <mi>r</mi> <mi>k</mi> </msub> </mfrac> <mo>.</mo> </mrow>
  6. 6. a kind of LTE system descending scheduling device, it is characterised in that including receiving unit, information extraction unit, pre-coding matrix It is historical information generation unit, updating block, recognition unit, modifying factor setting unit, equitable proportion factor calculating unit, preferential Level computing unit, scheduling unit, incidence relation memory cell, wherein：
    Receiving unit, for receiving the pre-coding matrix instruction information PMI and/or rank indication information RI of intra-cell users feedback；
    Information extraction unit, for receiving unit receive intra-cell users feeding back precoding matrix configured information PMI and/or At the rank indication information RI acquisition of information moment, extracted from incidence relation memory cell associated with the preceding n acquisition of information moment Intra-cell users precoding matrix information；
    Pre-coding matrix historical information generation unit, for utilizing the intra-cell users associated with the preceding n acquisition of information moment Precoding matrix information, generate the pre-coding matrix historical information of intra-cell users；
    Updating block, for updating the precoding matrix information of intra-cell users, by the current pre-coding matrix of intra-cell users The incidence relation that information obtains the moment with current information is stored in incidence relation memory cell；
    Recognition unit, for judging pre-coding matrix historical informations of the user k on i-th of resource block with user k in i-th of money Whether current precoding matrix information is identical in source block；
    Modifying factor setting unit, for the judged result according to recognition unit, if user k prelisting on i-th of resource block The code matrix historical information precoding matrix information current on i-th of resource block with user k differs, then user k is at i-th Equitable proportion modifying factor α on resource blockk,iFor β, wherein β is the normal number less than 1；
    Equitable proportion factor calculating unit, for the channel quality indication (CQI) information CQI according to user k on i-th of resource blockk,i, And user k average transmission rate rk, calculate equitable proportion factor fs of the user k on i-th of resource blockk,i；
    Priority calculation unit, for the equitable proportion factor f using user k on i-th of resource blockk,i, user k is at i-th Equitable proportion modifying factor α on resource blockk,i, obtain priority of the user k on i-th of resource block
    Scheduling unit, for for each resource block, the user for selecting priority maximum to be scheduled；
    Incidence relation memory cell, for the precoding matrix information for storing intra-cell users and corresponding acquisition of information moment Incidence relation.
  7. 7. device according to claim 6, it is characterised in that
    Modifying factor setting unit is additionally operable to the judged result according to recognition unit, if user k prelisting on i-th of resource block Code matrix historical information is identical with the precoding matrix information that user k is current on i-th of resource block, then user k is in i-th of money Equitable proportion modifying factor α in source blockk,iFor 1；Then indicate that priority calculation unit is performed using user k in i-th of resource Equitable proportion factor f on blockk,i, equitable proportion modifying factor αs of the user k on i-th of resource blockk,i, user k is obtained Priority on i resource blockOperation.
  8. 8. the device according to claim 6 or 7, it is characterised in that
    Priority calculation unit specifically utilizes formula
    <mrow> <msub> <mover> <mi>f</mi> <mo>&amp;OverBar;</mo> </mover> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>f</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>&amp;times;</mo> <msub> <mi>&amp;alpha;</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> </mrow>
    Obtain priority of the user k on i-th of resource blockWherein fk,iThe ratio for being user k on i-th of resource block is public The flat factor, αk,iThe equitable proportion modifying factor for being user k on i-th of resource block.
  9. 9. the device according to claim 6 or 7, it is characterised in that
    Updating block specifically utilizes formula
    RPk,i=RIk,i×l+PMIk,i
    Update precoding matrix information RPs of the user k on i-th of resource blockk,i, wherein RIk,iIt is user k in i-th of resource block On rank indication information, PMIk,iThe pre-coding matrix instruction information for being user k on i-th of resource block, l is precoding sample Number.
  10. 10. the device according to claim 6 or 7, it is characterised in that
    Equitable proportion factor calculating unit specifically utilizes formula
    <mrow> <msub> <mi>f</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>=</mo> <mfrac> <mrow> <mi>log</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>+</mo> <msub> <mi>CQI</mi> <mrow> <mi>k</mi> <mo>,</mo> <mi>i</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> <msub> <mi>r</mi> <mi>k</mi> </msub> </mfrac> </mrow>
    Calculate the equitable proportion factors of the user k on i-th of resource block.
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