CN102291839A - Method and device for transmitting CQI (channel quality indicator) information - Google Patents

Method and device for transmitting CQI (channel quality indicator) information Download PDF

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CN102291839A
CN102291839A CN2011102352266A CN201110235226A CN102291839A CN 102291839 A CN102291839 A CN 102291839A CN 2011102352266 A CN2011102352266 A CN 2011102352266A CN 201110235226 A CN201110235226 A CN 201110235226A CN 102291839 A CN102291839 A CN 102291839A
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transmission point
cooperation transmission
information
cqi
terminal
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CN102291839B (en
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倪浩
高秋彬
彭莹
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China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
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China Academy of Telecommunications Technology CATT
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Abstract

The embodiment of the invention provides a method and device for transmitting CQI (channel quality indicator) information, aiming to improve the calculation accuracy of the CQI information in a CoMP (coordinated multipoint transmission/reception) situation. The existing CQI information generation method can only generate the CQI information of single transmitting point, is difficult to obtain favorable multipoint coordination scheduling and precoding results and cannot accurately calculate a downlink CQI after scheduling. Moreover, by adopting the technical scheme provided by the embodiment of the invention, a terminal can obtain the CQI information of each corresponding coordinated transmitting point respectively according to a channel matrix and PMI (precoding matrix indicator) information corresponding to each coordinated transmitting point and the sum of interference and noise power beyond the measured coordinated transmitting points, and then send the CQI information of each coordinated transmitting point to a network side, thus the network side can implement more accurate scheduling and precoding, as well as link adaptation, and furthermore, the system performance can be promoted as a whole.

Description

A kind of CQI transmission of Information method and device
Technical field
The present invention relates to the communications field, particularly the transmission method of a kind of CQI and device.
Background technology
Carry out terminal scheduling and link circuit self-adapting in order to assist the base station, at the intrasystem CoMP of LTE (Long Term Evolution) (coordinated multipoint transmission/reception, the multipoint cooperative transmission) in, terminal needs reporting base station to arrive CQI (the Channel Quality Indicator of this terminal, the channel quality indication) information, be that terminal need be fed back corresponding C QI information at cooperation transmission point (comprising main transmission point and non-main transmission point), be used for processes such as the scheduling of base station and link circuit self-adapting; Wherein, corresponding regular hour of each CQI and frequency resource.
So-called CoMP promptly is the cooperation transmission between a plurality of transmission points that separate on the geographical position.Common, a plurality of transmission points are meant the base station of different districts, or, a plurality of RRH (Remote Radio Unit) of the base station of a sub-district and its control.The CoMP flow process can be divided into descending cooperation transmission and up unite reception.Descending cooperation transmission mainly is divided into two kinds of transmission plan: CS/CB (coordinated scheduling/coordinated beamforming, cooperative scheduling/precoding) and JP (joint processing, Combined Treatment) again.
Cooperative scheduling/precoding technique is meant between each transmission point and distributes by time, frequency and the space resources of coordinating terminal, reduce or avoid transmitting a little between the phase mutual interference, thereby raising terminal, the especially performance of edge, sub-district terminal; Specifically as shown in Figure 1, terminal scheduling is carried out by the running time-frequency resource of coordinating terminal room in three sub-districts, three terminal schedulings that interfere with each other easily to mutually orthogonal running time-frequency resource, thereby avoided the interference of minizone, the different different running time-frequency resource of arrows representative among Fig. 1.
And the Combined Treatment scheme can be divided into JT (joint transmission, joint transmission) and DPS (dynamic point selection, dynamic transmission point selection).Joint transmission is meant that a plurality of transmission points send data to terminal simultaneously, thereby has strengthened the received signal of terminal, improves terminal capabilities; Specifically as shown in Figure 2, simultaneously to a terminal transmission signal, terminal receives behind the signal of three sub-districts its mutual superposition on identical running time-frequency resource for three sub-districts, thereby has strengthened the received signal of terminal, has avoided the interference of minizone again.The dynamic transmission point selection is meant dynamic switching terminal transmission point, always selects the some transmission signals to the terminal optimum from cooperation transmission point.
In order to realize terminal scheduling, operation such as precoding and link circuit self-adapting, in LTE, terminal need be measured and feeds back the base station to the CSI (channel condition information) of terminal according to the downlink reference signal of base station, wherein, so-called downlink reference signal, can be CRS (cell-specific reference signals cell special reference), also can be CSI-RS (channel-state information reference signals, channel state information reference signals) or the like, and in the CSI information of terminal feedback, comprised CQI information, that feed back with CQI information may be PMI (precoding matrix indicator, pre-coding matrix index) information and RI (rank indication, data fluxion indication information) information, further, can also comprise relative phase information.
At present, in the LTE system, terminal needs to measure its signal power P that receives when the CQI information that formation reports 0, and interference power and noise power, what in fact terminal measured may be to disturb and the noise power sum, for ease of statement, interference and noise power sum is expressed as I.And under the prior art, terminal adopts formula one to calculate the CQI of feedback usually:
CQI n = Q ( P 0 , n I n ) Formula one
Wherein, CQI nFeedback CQI on the expression frequency range n, P 0, nSignal power on the frequency range n that the expression terminal is measured, I nInterference and noise power on the expression frequency range n, Q () is default quantization function.
In order to support the CoMP scheme, in LTE-A (Long Term Evolution of upgrading) system, feedback to the CSI information of terminal strengthens, be that terminal need be according to each macrocell in the measuring assembly or/and the transmission point arrives the downlink reference signal of terminal, measure each macrocell or/and the transmission point arrives the CSI information of terminal, after terminal is carried out scalar or vector quantization to these CSI information that record again then, feed back to the base station of each macrocell or/and respectively transmit a little.
Yet, in present LTE-A system, the base station receive that terminal is calculated with reference to LTE system executive mode and the CSI information of feedback after, the scheduling and the MCS (modulation coding mode) that can't finish terminal select, this be because:
1) each transmission point may carry out combined dispatching and precoding, and PMI that comprises in the CSI information and relative phase information can not reflect the amplitude information of interchannel;
2) because the employing of technology such as cooperative scheduling/precoding and Combined Treatment make that great changes will take place for the interference level of terminal before and after the base station scheduling, and terminal can not be predicted the interference level situation of change after dispatching when forming the CSI information of feedback.
Summary of the invention
The embodiment of the invention provides a kind of CQI transmission of Information method and device, in order under the CoMP scene, improves the computational accuracy of CQI information.
The concrete technical scheme that the embodiment of the invention provides is as follows:
A kind of CQI transmission of Information method comprises:
Receive the downlink reference signal that each cooperation transmission point sends;
The downlink reference signal that sends according to each cooperation transmission point obtains the channel matrix and the PMI information of corresponding cooperation transmission point respectively;
Measurement is from interference outside the cooperation transmission point and noise power sum;
Corresponding according to each cooperation transmission point respectively channel matrix and PMI information, and described interference and noise power sum are calculated the CQI information of corresponding cooperation transmission point;
The CQI information of each cooperation transmission point is mail to network side, make network side carry out respective handling according to described CQI information.
A kind of CQI transmission of Information processing method comprises:
The receiving terminal side is according to the CQI information at each cooperation transmission point of above-mentioned the whole bag of tricks feedback;
According to the CQI information of each the cooperation transmission point that receives, carry out respective handling.
A kind of CQI transmission of Information device comprises:
Receiving element is used to receive the downlink reference signal that each cooperation transmission point sends;
First processing unit, the downlink reference signal that is used for sending according to each cooperation transmission point respectively obtains the channel matrix and the PMI information of corresponding cooperation transmission point;
Measuring unit is used to measure from interference outside the cooperation transmission point and noise power sum;
Second processing unit is used for corresponding according to each cooperation transmission point respectively channel matrix and PMI information, and described interference and noise power sum, calculates the CQI information of corresponding cooperation transmission point;
Transmitting element is used for the CQI information of each cooperation transmission point is mail to network side, makes network side carry out respective handling according to described CQI information.
A kind of CQI transmission of Information processing unit comprises:
Communication unit is used to receive the CQI information at each cooperation transmission point that above-mentioned various device feeds back;
Processing unit is used for the CQI information according to each the cooperation transmission point that receives, and carries out respective handling.
In the embodiment of the invention, a kind of production method of the CQI information based on a plurality of cooperation transmission points is provided and has utilized the CQI information of a plurality of cooperation transmission points to recomputate the method for the descending CQI of terminal, the combined dispatching that is used for a plurality of cooperation transmission points, precoding, and link of terminal self adaptation, existing C QI information generation method can only produce the CQI information of single transmission point, be difficult to obtain good multipoint cooperative scheduling and precoding result, can't accurately calculate the descending CQI of scheduling terminal afterwards, and the technical scheme that adopts inventive embodiments to provide, channel matrix and PMI information that terminal is can be respectively corresponding according to each cooperation transmission point, with measure from interference outside the cooperation transmission point and noise power sum, obtain the CQI information of corresponding cooperation transmission point, then, CQI information with each cooperation transmission point mails to network side again, thereby make network side can implement more accurate scheduling and precoding, and link circuit self-adapting, and then elevator system performance on the whole.
Description of drawings
Fig. 1 is prior art figure below cooperative scheduling/precoding schematic diagram;
Fig. 2 is a joint transmission schematic diagram under the prior art;
Fig. 3 is a communication system architectural framework schematic diagram in the embodiment of the invention;
Fig. 4 is a termination function structural representation in the embodiment of the invention;
Fig. 5 is a base station functions structural representation in the embodiment of the invention;
Fig. 6 is a terminal feedback CQI information flow chart in the embodiment of the invention;
Fig. 7 carries out the respective handling flow chart for base station in the embodiment of the invention based on the CQI information of terminal feedback.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiment of the present invention is elaborated.
Consult Fig. 3, Fig. 4 and shown in Figure 5, in the embodiment of the invention, communication system (as, the LTE-A system), comprise several base stations and terminal, wherein
Terminal comprises receiving element 40, first processing unit 41, measuring unit 42, second processing unit 43, transmitting element 44, wherein,
Receiving element 40 is used to receive the downlink reference signal that each cooperation transmission point sends;
First processing unit 41, the downlink reference signal that is used for sending according to each cooperation transmission point respectively obtains the channel matrix and the PMI information of corresponding cooperation transmission point;
Measuring unit 42 is used to measure from interference outside the cooperation transmission point and noise power sum;
Second processing unit 43 is used for corresponding according to each cooperation transmission point respectively channel matrix and PMI information, and interference and noise power sum, calculates the CQI information of corresponding cooperation transmission point;
Transmitting element 44 is used for the CQI information of each cooperation transmission point is mail to network side, makes network side carry out respective handling according to CQI information.
The base station comprises communication unit 50 and processing unit 51,
Communication unit 50 is used to receive the CQI information at each cooperation transmission point of the device feedback of claim 10-14;
Processing unit 51 is used for the CQI information according to each the cooperation transmission point that receives, and carries out respective handling.
Based on technique scheme, to consult shown in Figure 6ly, in the embodiment of the invention, terminal is as follows to the detailed process of network side feedback CQI information:
Step 600: in CoMP, terminal receives the downlink reference signal that each cooperation transmission point sends.
In step 600, each cooperation transmission point is CRS or CSI-RS to the downlink reference signal that terminal sends.
In the present embodiment, will be designated as c to the cooperation transmission point set that terminal j sends downlink reference signal j, j is a terminal serial number, terminal needs respectively according to set c jIn the downlink reference signal that sends of each cooperation transmission point measure the CSI that corresponding cooperation transmission is put terminal, this CSI comprises the cooperation transmission point at least to CQI, the PMI of terminal and a kind of or combination in any among the RI, can also comprise relative phase information.
Step 610: the downlink reference signal that terminal sends according to each cooperation transmission point respectively obtains the channel matrix and the pre-coding matrix indication PMI information of corresponding cooperation transmission point.
With any one cooperation transmission point is example, when execution in step 610, specifically may further comprise the steps:
At first, terminal is constructed the channel matrix of this any one cooperation transmission point on each selected subcarrier respectively according to the downlink reference signal of any one cooperation transmission point transmission.In the present embodiment, the sequence number of any one cooperation transmission point is designated as i, the sequence number of any one subcarrier is designated as n, then the defeated some i of cooperation association channel matrix to terminal j on subcarrier n is expressed as H Ij, n, the dimension of this channel matrix is N R, j* N T, i, N wherein R, jThe reception antenna number of expression terminal j, N T, iThe number of transmit antennas of expression cooperation transmission point i.
Then, terminal is calculated the corresponding PMI information that obtains according to each channel matrix that obtains.In the practical application, at different subcarriers, terminal can adopt different linearities to receive processing array, also can adopt unified linearity to receive processing array; In the present embodiment, the linearity reception processing array that terminal j is adopted on subcarrier n is designated as u J, n, terminal j can be with u J, nMultiply each other with the signal matrix that receives at subcarrier n, obtain to be used for the signal phasor of subsequent brew demodulation.
For example, terminal j can adopt formula two directly to calculate and obtain corresponding PMI information according to each channel matrix that obtains, and is specific as follows:
v ij = ξ ( rsv ( 1 | N | Σ n ∈ N ( H ij , n ) H H ij , n ) ) Formula two
Wherein, v IjExpression cooperation transmission point i is to the PMI information of terminal j, v IjCan be a vector, also can be a matrix (together, repeating no more down), and ξ () expression is arrived the PMI code word to DUAL PROBLEMS OF VECTOR MAPPING; The right main singular vector of matrix is got in rsv () expression, and N represents the subcarrier set, | N| represents number of sub carrier wave, H Ij, nExpression cooperation association fails some i channel matrix to terminal j on subcarrier n, (.) HThe transformation of ownership of expression conjugation.
The set of subcarrier that N represents, its corresponding frequency range can be a PRB (frequency resource block), subband or whole system frequency range.
Again for example, terminal j can receive processing array according to each channel matrix that obtains and corresponding linearity, and is when adopting formula three to calculate corresponding PMI information, specific as follows:
v ij = ξ ( rsv ( 1 | N | Σ n ∈ N ( u j , n H ij , n ) H u j , n H ij , n ) ) Formula three
Wherein, v IjExpression cooperation transmission point i is to the PMI information of terminal j, and ξ () expression is arrived the PMI code word to DUAL PROBLEMS OF VECTOR MAPPING; The right main singular vector of matrix is got in rsv () expression, and N represents the subcarrier set, | N| represents number of sub carrier wave, H Ij, nExpression cooperation association fails some i channel matrix to terminal j on subcarrier n, u J, nThe linearity that the expression terminal j adopts on subcarrier n receives processing array, (.) HThe transformation of ownership of expression conjugation.
Step 620: terminal measure from outside the cooperation transmission point (promptly from gathering c jOutside) interference and noise power sum.
In the present embodiment, above-mentioned interference and noise power sum are designated as I n
Step 630: channel matrix and PMI information that terminal is corresponding according to each cooperation transmission point respectively, and above-mentioned interference and noise power sum, calculate the CQI information of corresponding cooperation transmission point.
Be example still with any one cooperation transmission point, in the present embodiment, when execution in step 630, terminal can be at least according to the channel matrix and the PMI information of the interference that records and noise power sum, above-mentioned any one cooperation transmission point correspondence, and the local linearity that adopts receives processing array, calculate the CQI information of above-mentioned any one cooperation transmission point, specifically can be divided into following two kinds of situations and carry out:
Under first kind of situation, cooperation transmission point i is main transmission point, so-called main transmission point promptly is meant the cooperation transmission point that sends the active data signal in cooperative scheduling/precoding and dynamic transmission point selection to terminal, and is selected by terminal in joint transmission or by a cooperation transmission point that sends the active data signal to terminal of base station definition.In the present embodiment, the main transmission point of terminal j is gathered c at cooperation transmission point jMiddle sequence number is designated as 0, and is also like this in the subsequent embodiment, will repeat no more.
At this moment, terminal can be according to interference that records and noise power sum, main transmission corresponding channel matrix and a PMI information, and the local linearity that adopts receives processing array, the CQI information of the main transmission point of calculating; Perhaps, terminal also can be according to received power, the interference that records and the noise power sum at the non-main transmission point that record, main transmission corresponding channel matrix and a PMI information, and the local linearity that adopts receives processing array, the CQI information of the main transmission point of calculating.
For example, terminal j can adopt formula four to calculate the CQI information of main transmission point, at this moment, and the CQI feedback quantity that the CQI information of main transmission point can only comprise an expression when not considering cooperation transmission point interference, what is called does not consider that cooperation transmission point disturbs, and promptly is meant only to consider set c jOutside interference, promptly only consider I n, (together, will repeat no more down) is specific as follows:
γ 0j=Q (g ({ γ 0j, n| n ∈ N})) formula four
Wherein, γ 0jThe main transmission point of expression to terminal j do not consider the interference of cooperation transmission point the time the CQI feedback quantity, Q (.) represents quantization function, the default CQI mapping function of g () expression, concrete can be the EESM (Exponential Effective SINR Mapping, index equivalence SINR mapping function) that is used to average.γ 0j, nThe main transmission point of expression on the subcarrier n to terminal j do not consider the interference of cooperation transmission point the time SINR (Signal to Interference plus Noise Ratio), || .|| represents to ask modular arithmetic, H 0j, nThe main transmission point of expression arrives the channel matrix of terminal j, u on subcarrier n J, nThe linearity that the expression terminal j adopts on subcarrier n receives processing array, v 0jThe main transmission point of expression is to the PMI information of terminal j, I nInterference and noise power sum outside the expression cooperation transmission point.
Again for example, terminal j can adopt formula five to calculate the CQI information of main transmission point, at this moment, CQI feedback quantity when the CQI information of master's transmission point can comprise an expression consideration cooperation transmission point interference and a CQI feedback increment, the increment of the CQI feedback quantity of the CQI feedback quantity of this CQI feedback increment when not considering that cooperation transmission point disturbs when considering the interference of cooperation transmission point, specific as follows:
γ 0 j ′ = Q ( g ( { γ 0 j , n ′ | n ∈ N } ) ) Δ 0 j = Q ( g ( { γ 0 j , n | n ∈ N } ) / g ( { γ 0 j , n ′ | n ∈ N } ) ) Formula five
Wherein, γ ' 0jCQI feedback quantity when the consideration cooperation transmission point that the main transmission point of expression arrives terminal j disturbs, Δ 0jThe main transmission point of expression is to the γ of terminal j 0jWith respect to γ ' 0jCQI feedback increment, Q (.) represent quantization function, the CQI mapping function that g () expression is preset, γ 0j, nThe main transmission point of expression on the subcarrier n to terminal j do not consider the interference of cooperation transmission point the time SINR, γ ' 0j, nSINR when the main transmission point of expression arrives terminal j on subcarrier n consideration cooperation transmission point disturbs, γ 0 j , n = | | u j , n H 0 j , n v 0 j | | 2 I n , γ 0 j , n ′ = | | u j , n H 0 j , n v 0 j | | 2 I n + I 0 , n , || .|| represents to ask modular arithmetic, u J, nThe linearity that the expression terminal j adopts on subcarrier n receives processing array, H 0j, nThe main transmission point of expression arrives the channel matrix of terminal j, v on subcarrier n 0jThe main transmission point of expression is to the PMI information of terminal j, I nInterference and noise power sum outside the expression cooperation transmission point, I 0, nExpression set c jThe terminal received power of interior non-main transmission point can be measured or be calculated by terminal.
Under second kind of situation, cooperation transmission point i is non-main transmission point, at this moment, terminal can be put the channel matrix and the PMI information of i correspondence according to cooperation transmission, main transmission corresponding channel matrix and a PMI information, and the local linearity that adopts receives processing array, the CQI information of calculating cooperation transmission point i.In the present embodiment, the corresponding CQI information of each non-main transmission point is that example describes with a non-main transmission point only herein.
For example, terminal j can adopt the CQI information of formula 6 any one non-transmission point of calculating, and is specific as follows:
γ Ij=Q (g ({ γ Ij, n| n ∈ N})), (i ∈ c j, i ≠ 0) and formula six
Wherein, γ IjTo the CQI feedback quantity of terminal j, Q (.) represents quantization function to expression cooperation transmission point i (being non-main transmission point), the default CQI mapping function of g () expression, γ Ij, nExpression cooperation transmission point i arrives the SINR of terminal j on subcarrier n, γ ij , n = | | u j , n H 0 j , n v 0 j | | 2 | | u j , n H ij , n v ij | | 2 , (i ∈ c j, i ≠ 0), || .|| represents to ask modular arithmetic, u J, nThe linearity that the expression terminal j adopts on subcarrier n receives processing array, H 0j, nThe main transmission point of expression arrives the channel matrix of terminal j, v on subcarrier n 0jThe main transmission point of expression is to the PMI information of terminal j, H Ij, nExpression cooperation transmission point i (being non-main transmission point) arrives the channel matrix of terminal j, v on subcarrier n IjExpression cooperation transmission point i (being non-main transmission point) is to the PMI information of terminal j.
Step 640: terminal mails to network side with the CQI information of each cooperation transmission point, makes network side carry out respective handling according to the CQI information that receives.
In the present embodiment, when terminal mails to network side in the CQI information with each cooperation transmission point, the CQI information of each cooperation transmission point can be mail at least the base station of network side by main transmission point, specifically comprise:
If main transmission point is the base station, then terminal mails to corresponding cooperation transmission point respectively with the CQI information of each cooperation transmission point, mails to the base station by the name a person for a particular job CQI information of reception of each cooperation transmission; Perhaps, terminal directly mails to the base station with the CQI information of each cooperation transmission point;
If main transmission point be the base station, then terminal mails to the cooperation transmission point of correspondence respectively with the CQI information of each cooperation transmission point, mails to the base station by the name a person for a particular job CQI information of reception of each cooperation transmission; Perhaps, terminal mails to corresponding cooperation transmission point respectively with the CQI information of each cooperation transmission point, mails to main transmission point by each cooperation transmission CQI information that receives of naming a person for a particular job, and mails to the base station by the name a person for a particular job CQI information of each cooperation transmission point of main transmission again; Perhaps, terminal directly mails to main transmission point with the CQI information of each cooperation transmission point, mails to the base station by the main CQI information of transmitting the receipts of each cooperation transmission point of naming a person for a particular job.
On the other hand, terminal can also send PMI information, RI information and relative phase information of each cooperation transmission point or the like in the process of the CQI information that sends each cooperation transmission point to the base station.Wherein, the feedback system of other information such as PMI information, RI information and relative phase information also can be with reference to the concrete executive mode of step 640 and is carried out, and does not repeat them here.
Based on the foregoing description, respective handling will be carried out to terminal according to the CQI information that obtains in the base station after the CQI information that receives the terminal feedback, so, consult shown in Figure 7ly, in the embodiment of the invention, the detailed process that respective handling is carried out based on the CQI information of terminal feedback in the base station is as follows:
Step 700: the CQI information that base station receiving terminal side is fed back according to the variety of way in the step 600-step 640 at each cooperation transmission point,
Corresponding with step 640, in the embodiment of the invention, when execution in step 700, the CQI information of each cooperation transmission point of at least one cooperation transmission point receiving terminal side feedback can be passed through in the base station, is specially:
If this locality is the base station, then receiving terminal passes through the corresponding C QI information that each cooperation transmission point sends, perhaps, and the CQI information of each cooperation transmission point that receiving terminal directly sends;
If this locality is not the base station, then receiving terminal is by the corresponding C QI information of each cooperation transmission point transmission; Perhaps, receiving terminal is by the CQI information of each cooperation transmission point of main transmission point transmission.
On the other hand, the base station in the process of the CQI information of each cooperation transmission point that receiving terminal sends, PMI information, RI information and relative phase information of each cooperation transmission point that can also the receiving terminal transmission or the like.Wherein, the receive mode of other information such as PMI information, RI information and relative phase information also can be with reference to the concrete executive mode of step 700 and is carried out, and does not repeat them here.
Step 710: respective handling is carried out according to the CQI information of each the cooperation transmission point that receives in the base station.
In the present embodiment, when execution in step 710, specifically comprise:
At first, the total SINR of computing terminal on each selected subcarrier distinguished according to the CQI information and the corresponding PMI information of each the cooperation transmission point that receives in the base station.
Be specially: the base station can be dispatched terminal based on the corresponding PMI information of CQI information of each the cooperation transmission point that receives, promptly distribute corresponding running time-frequency resource, then, the base station is again according to the CQI information and the corresponding PMI information of each the cooperation transmission point that receives, in conjunction with the scheduling result and the precoding result of terminal, calculate the total SINR of terminal on each selected subcarrier respectively.Wherein, so-called selected subcarrier promptly is meant when dispatch terminal the base station, is each subcarrier of terminal distribution.
For example, in the present embodiment, suppose that the base station dispatches terminal j on subcarrier n by the main transmission point of terminal j, simultaneously, suppose that the main transmission of base station by terminal j dispatched terminal P simultaneously on subcarrier n, be that the base station has been dispatched to terminal j and terminal p on the same running time-frequency resource, certainly, also can dispatch the more other-end of more number, be example with one only herein, and, will be based on set c jThe terminal set of final scheduling is designated as
Figure BDA0000083724300000121
Will be based on set c jThe cooperation transmission point set of final scheduling is designated as s j, s jBe c jSubclass, be that the base station is from c jIn pick out s jIn comprised the cooperation transmission point that has distributed identical running time-frequency resource for terminal j; Further, suppose that the pre-coding matrix that cooperation transmission point i adopts when on subcarrier n terminal j being sent signal is W Ij, n, i ∈ s j, then the base station can adopt formula seven to come the total SINR of computing terminal j on subcarrier n, and concrete mode is as follows:
γ ^ j , n = γ ^ 0 j | | v 0 j H W ij , n | | 2 1 + γ ^ 0 j | | v 0 j H W 0 p , n | | 2 + Σ q ∈ U c j , q ≠ j , p γ ^ 0 j γ lj | | v lj H w lq , n | | 2 Formula seven
Wherein, The total SINR of expression terminal j on subcarrier n,
Figure BDA0000083724300000124
The main transmission point of expression to terminal j do not consider that cooperation transmission point disturbs the time CQI information, if terminal j employing formula four expression CQI feedback quantities, then
Figure BDA0000083724300000125
If terminal j adopts formula five to express CQI feedback quantity and CQI feedback increment, then (.) HThe transformation of ownership of expression conjugation, v 0jThe main transmission point of expression is to the PMI information of terminal j, W Ij, nThe pre-coding matrix that expression cooperation transmission point i adopts during to terminal j transmission signal on subcarrier n, W 0p, nThe pre-coding matrix that the main transmission point of expression adopts when on subcarrier n terminal P being sent signal, terminal p represents the other-end that the main transmission point of terminal j is dispatched simultaneously on subcarrier n, terminal q represents the other-end that the non-main transmission point of terminal j is dispatched simultaneously on subcarrier n, cooperation transmission point l represents the main transmission point of terminal q, herein, be example only also to have dispatched an other-end, γ LjExpression cooperation transmission point l is to the CQI feedback quantity of terminal j, v LjExpression cooperation transmission point l is to the PMI information of terminal j, w Lq, nThe pre-coding matrix that expression cooperation transmission point l adopts during to terminal q transmission signal on subcarrier n.
Secondly, the total SINR on each subcarrier that the base station will obtain is mapped as unified descending CQI.
In the present embodiment, the base station can adopt formula eight to carry out the unified mapping of descending CQI, and is specific as follows:
γ ^ j = g ( { γ ^ j , n | n ∈ B } ) Formula eight
Wherein,
Figure BDA0000083724300000132
The descending CQI of expression terminal j, the default CQI mapping function of g () expression,
Figure BDA0000083724300000133
Be the total SINR of terminal j on subcarrier n, B represents that the base station is the selected subcarrier set of terminal when carrying out terminal scheduling, and the frequency band of B correspondence can be a PRB, subband or whole system frequency band.
At last, the base station is carried out modulating-coding MCS selection according to the descending CQI that obtains to terminal, and the downlink transfer amount of information of definite terminal.
In the embodiment of the invention, a kind of production method of the CQI information based on a plurality of cooperation transmission points is provided and has utilized the CQI information of a plurality of cooperation transmission points to recomputate the method for the descending CQI of terminal, the combined dispatching that is used for a plurality of cooperation transmission points, precoding, and link of terminal self adaptation, existing C QI information generation method can only produce the CQI information of single transmission point, be difficult to obtain good multipoint cooperative scheduling and precoding result, can't accurately calculate the descending CQI of scheduling terminal afterwards, and the technical scheme that adopts inventive embodiments to provide, channel matrix and PMI information that terminal is can be respectively corresponding according to each cooperation transmission point, with measure from interference outside the cooperation transmission point and noise power sum, obtain the CQI information of corresponding cooperation transmission point, then, CQI information with each cooperation transmission point mails to network side again, thereby make network side can implement more accurate scheduling and precoding, and link circuit self-adapting, and then elevator system performance on the whole.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (18)

1. a channel quality indicator (CQI) transmission of Information method is characterized in that, comprising:
Receive the downlink reference signal that each cooperation transmission point sends;
The downlink reference signal that sends according to each cooperation transmission point obtains the channel matrix and the pre-coding matrix indication PMI information of corresponding cooperation transmission point respectively;
Measurement is from interference outside the cooperation transmission point and noise power sum;
Corresponding according to each cooperation transmission point respectively channel matrix and PMI information, and described interference and noise power sum are calculated the CQI information of corresponding cooperation transmission point;
The CQI information of each cooperation transmission point is mail to network side, make network side carry out respective handling according to described CQI information.
2. the method for claim 1 is characterized in that, the downlink reference signal that sends according to any one cooperation transmission point obtains the channel matrix and the PMI information of this cooperation transmission point, comprising:
Construct the channel matrix of this any one cooperation transmission point on each selected subcarrier respectively according to the downlink reference signal that described any one cooperation transmission point sends;
According to each channel matrix that obtains, calculate the corresponding PMI information that obtains.
3. method as claimed in claim 1 or 2, it is characterized in that, channel matrix and the PMI information corresponding according to any one cooperation transmission point, and described interference and noise power sum, calculate the CQI information of this cooperation transmission point, comprise: at least according to described interference and noise power sum, corresponding channel matrix and the PMI information of described any one cooperation transmission point, and corresponding linear receives processing array, calculates the CQI information of described any one cooperation transmission point.
4. method as claimed in claim 3, it is characterized in that, at least according to described interference and noise power sum, corresponding channel matrix and the PMI information of described any one cooperation transmission point, and corresponding linear receives processing array, calculate the CQI information of described any one cooperation transmission point, comprising:
If described any one cooperation transmission point is main transmission point, then according to described interference and noise power sum, corresponding channel matrix and the PMI information of described any one cooperation transmission point, and corresponding linear receives processing array, calculates described any one cooperation transmission point correspondence do not consider the interference of cooperation transmission point the time the CQI feedback quantity; Perhaps, according to received power at non-main transmission point, described interference and noise power sum, corresponding channel matrix and the PMI information of described any one cooperation transmission point, and corresponding linear receives processing array, the increment of the CQ feedback quantity when the CQI feedback quantity was with respect to the interference of consideration cooperation transmission point when CQI feedback quantity and CQI feedback increment when calculating the corresponding consideration cooperation transmission point of described any one cooperation transmission point and disturbing, this CQI feedback incremental representation did not consider that cooperation transmission point disturbs;
If described any one cooperation transmission point is non-main transmission point, then corresponding channel matrix and PMI information according to this any one cooperation transmission point, corresponding channel matrix and the PMI information of main transmission point, and corresponding linear receives processing array, calculates the CQI feedback quantity of this any one cooperation transmission point.
5. method as claimed in claim 1 or 2 is characterized in that, the CQI information of each cooperation transmission point is mail to network side, comprising: the CQI information of each cooperation transmission point is reported to network side by main transmission point at least.
6. a channel quality indicator (CQI) transmission of Information processing method is characterized in that, comprising:
The receiving terminal side is according to the CQI information at each cooperation transmission point of each described method feedback of claim 1-5;
According to the CQI information of each the cooperation transmission point that receives, carry out respective handling.
7. method as claimed in claim 6 is characterized in that, the CQI information at each cooperation transmission point of receiving terminal side feedback comprises: at least by the main CQI information of transmitting each cooperation transmission point of some receiving terminal side feedback.
8. as claim 6 or 7 described methods, it is characterized in that,, carry out respective handling, comprising according to the CQI information of each the cooperation transmission point that receives:
According to the CQI and the corresponding PMI information of each the cooperation transmission point that receives, calculate the total Signal to Interference plus Noise Ratio SINR of described terminal on each selected subcarrier respectively;
Total SINR on each subcarrier that obtains is mapped as unified descending CQI;
According to the descending CQI that obtains terminal is carried out the downlink transfer amount of information that modulating-coding MCS selects and determines terminal.
9. method as claimed in claim 8, it is characterized in that, CQI and corresponding PMI information according to each the cooperation transmission point that receives, calculate the total Signal to Interference plus Noise Ratio SINR of described terminal on each selected subcarrier respectively, comprise: CQI information and corresponding PMI information based on each the cooperation transmission point that receives are dispatched terminal, again according to the CQI information and the corresponding PMI information of described each cooperation transmission point, in conjunction with the scheduling result and the precoding result of described terminal, calculate the total SINR of described terminal on each selected subcarrier respectively.
10. a channel quality indicator (CQI) transmission of Information device is characterized in that, comprising:
Receiving element is used to receive the downlink reference signal that each cooperation transmission point sends;
First processing unit, the downlink reference signal that is used for sending according to each cooperation transmission point respectively obtain the channel matrix and the pre-coding matrix indication PMI information of corresponding cooperation transmission point;
Measuring unit is used to measure from interference outside the cooperation transmission point and noise power sum;
Second processing unit is used for corresponding according to each cooperation transmission point respectively channel matrix and PMI information, and described interference and noise power sum, calculates the CQI information of corresponding cooperation transmission point;
Transmitting element is used for the CQI information of each cooperation transmission point is mail to network side, makes network side carry out respective handling according to described CQI information.
11. device as claimed in claim 10 is characterized in that, the downlink reference signal that described first processing unit sends according to any one cooperation transmission point obtains the channel matrix and the PMI information of this cooperation transmission point, comprising:
The downlink reference signal that described first processing unit sends according to described any one cooperation transmission point is constructed the channel matrix of this any one cooperation transmission point on each selected subcarrier respectively;
Described first processing unit calculates the corresponding PMI information that obtains according to each channel matrix that obtains.
12. as claim 10 or 11 described devices, it is characterized in that, channel matrix and PMI information that described second processing unit is corresponding according to any one cooperation transmission point, and described interference and noise power sum, calculate the CQI information of this cooperation transmission point, comprise: described second processing unit is at least according to described interference and noise power sum, corresponding channel matrix and the PMI information of described any one cooperation transmission point, and corresponding linear receives processing array, the CQI information of described any one the cooperation transmission point of calculating.
13. device as claimed in claim 12, it is characterized in that, described second processing unit is at least according to described interference and noise power sum, corresponding channel matrix and the PMI information of described any one cooperation transmission point, and corresponding linear receives processing array, calculate the CQI information of described any one cooperation transmission point, comprising:
If described any one cooperation transmission point is main transmission point, then described second processing unit is according to described interference and noise power sum, corresponding channel matrix and the PMI information of described any one cooperation transmission point, and corresponding linear receives processing array, calculates described any one cooperation transmission point correspondence do not consider the interference of cooperation transmission point the time CQI feedback quantity; Perhaps, according to received power at non-main transmission point, described interference and noise power sum, corresponding channel matrix and the PMI information of described any one cooperation transmission point, and corresponding linear receives processing array, the increment of the CQ feedback quantity when the CQI feedback quantity was with respect to the interference of consideration cooperation transmission point when CQI feedback quantity and CQI feedback increment when calculating the corresponding consideration cooperation transmission point of described any one cooperation transmission point and disturbing, this CQI feedback incremental representation did not consider that cooperation transmission point disturbs;
If described any one cooperation transmission point is non-main transmission point, channel matrix and PMI information that then described second processing unit is corresponding according to this any one cooperation transmission point, corresponding channel matrix and the PMI information of main transmission point, and corresponding linear receives processing array, calculates the CQI feedback quantity of this any one cooperation transmission point.
14. as claim 10 or 11 described devices, it is characterized in that, when described transmitting element mails to network side with the CQI information of each cooperation transmission point, the CQI information of each cooperation transmission point reported to network side by main transmission point at least.
15. a channel quality indicator (CQI) transmission of Information processing unit is characterized in that, comprising:
Communication unit is used to receive the CQI information at each cooperation transmission point that each described device of claim 10-14 feeds back;
Processing unit is used for the CQI information according to each the cooperation transmission point that receives, and carries out respective handling.
16. device as claimed in claim 15 is characterized in that, described communication unit receiving terminal side feedback at the CQI information of each cooperation transmission point the time, the CQI information of each the cooperation transmission point that feeds back by main transmission point receiving terminal side at least.
17., it is characterized in that described processing unit carries out respective handling according to the CQI information of each the cooperation transmission point that receives, and comprising as claim 15 or 16 described devices:
Described processing unit calculates the total Signal to Interference plus Noise Ratio SINR of described terminal on each selected subcarrier respectively according to the CQI and the corresponding PMI information of each the cooperation transmission point that receives;
Total SINR on each subcarrier that described processing unit will obtain is mapped as unified descending CQI;
Described processing unit carries out the downlink transfer amount of information that modulating-coding MCS selects and determines terminal according to the descending CQI that obtains to terminal.
18. device as claimed in claim 17, it is characterized in that, described processing unit is according to the CQI and the corresponding PMI information of each the cooperation transmission point that receives, calculate the total Signal to Interference plus Noise Ratio SINR of described terminal on each selected subcarrier respectively, comprise: described processing unit is dispatched terminal based on the CQI information and the corresponding PMI information of each the cooperation transmission point that receives, again according to the CQI information and the corresponding PMI information of described each cooperation transmission point, in conjunction with the scheduling result and the precoding result of described terminal, calculate the total SINR of described terminal on each selected subcarrier respectively.
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