CN102291839B - 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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CN102291839B
CN102291839B CN201110235226.6A CN201110235226A CN102291839B CN 102291839 B CN102291839 B CN 102291839B CN 201110235226 A CN201110235226 A CN 201110235226A CN 102291839 B CN102291839 B CN 102291839B
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terminal
cooperation transmission
transmission point
amp
main transfer
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CN201110235226.6A
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CN102291839A (en
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倪浩
高秋彬
彭莹
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电信科学技术研究院
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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 transmission method of CQI information 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 base station, at the intrasystem CoMP of LTE (Long Term Evolution) (coordinated multipoint transmission/reception, coordinated multipoint transmission) in, terminal needs reporting base station to arrive CQI (the Channel Quality Indicator of this terminal, channel quality indication) information, be that terminal need to be fed back corresponding CQI information for cooperation transmission point (comprising main transfer point and non-main transfer point), for the process such as scheduling and link circuit self-adapting of base station; Wherein, corresponding regular hour of each CQI and frequency resource.

So-called CoMP is the cooperation transmission between the multiple transfer points that separate on geographical position.Common, multiple transfer points refer to the base station of different districts, or, multiple RRH (Remote Radio Unit) of the base station of Yi Ge community and its control.CoMP flow process can be divided into descending cooperation transmission and up combine reception.Descending cooperation transmission is mainly divided into again two kinds of transmission plan: CS/CB (coordinated scheduling/coordinated beamforming, cooperative scheduling/precoding) and JP (joint processing, Combined Treatment).

Cooperative scheduling/precoding technique refers between each transfer point and distributes by time, frequency and the space resources of coordinating terminal, reduces or avoids the phase mutual interference between transfer point, thereby improving terminal, the especially performance of edge, community terminal; Specifically as shown in Figure 1, terminal scheduling is carried out by the running time-frequency resource of coordinating terminal room in San Ge community, three terminal schedulings that easily interfere with each other to mutually orthogonal running time-frequency resource, thereby avoided the interference of minizone, in Fig. 1, different arrows represents different running time-frequency resources.

And Combined Treatment scheme can be divided into JT (joint transmission, joint transmission) and DPS (dynamic point selection, dynamic transmission point selection).Joint transmission refers to that multiple transfer points send data to terminal simultaneously, thereby has strengthened the reception signal of terminal, improves terminal capabilities; Specifically as shown in Figure 2, San Ge community is simultaneously to a terminal transmission signal on identical running time-frequency resource, and terminal superposes it after receiving the signal of San Ge community mutually, thereby has strengthened the reception signal of terminal, has avoided again the interference of minizone.Dynamic transmission point selection refers to dynamic switching terminal transfer point, always from cooperation transmission point, selects the some signal transmission to terminal optimum.

In order to realize terminal scheduling, the operation such as precoding and link circuit self-adapting, in LTE, terminal need to be measured and feed back the CSI (channel condition information) of base station to terminal according to the downlink reference signal of base station transmitting, 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) etc., and in the CSI of terminal feedback information, comprise CQI information, that feed back together 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 LTE system, when CQI information that terminal reports in formation, need to measure the signal power P that it receives 0, and interference power and noise power, what in fact terminal measured may be to disturb and noise power sum, for ease of statement, interference and noise power sum is expressed as to I.And under prior art, terminal adopts formula one to calculate the CQI of feedback conventionally:

CQI n = Q ( P 0 , n I n ) Formula one

Wherein, CQI nrepresent the feedback CQI on frequency range n, P 0, nsignal power on the frequency range n that expression terminal is measured, I nrepresent interference and noise power on frequency range n, Q () is default quantization function.

In order to support CoMP scheme, in LTE-A (Long Term Evolution of upgrading) system, the feedback of the CSI information to terminal strengthens, be terminal need to be according to each macrocell in measuring assembly or/and transfer point to the downlink reference signal of terminal, measure each macrocell or/and transfer point to the CSI information of terminal, then the CSI information that terminal records these is again carried out after scalar or vector quantization, feeds back to the base station of each macrocell or/and each transfer point.

But, in current LTE-A system, base station receive that terminal is calculated with reference to LTE system executive mode and the CSI information fed back after, scheduling and the MCS (modulation coding mode) that can't complete terminal select, this be because:

1) each transfer point may be carried out combined dispatching and precoding, and the PMI comprising in CSI information and relative phase information can not reflect the amplitude information of interchannel;

2) due to the employing of the technology such as cooperative scheduling/precoding and Combined Treatment, make before and after base station scheduling, great changes will take place for the interference level of terminal, and terminal can not be predicted scheduling interference level situation of change afterwards in the time forming the CSI information of feedback.

Summary of the invention

The embodiment of the present invention provides a kind of transmission method and device of CQI information, in order under CoMP scene, improves the computational accuracy of CQI information.

The concrete technical scheme that the embodiment of the present invention provides is as follows:

A transmission method for CQI information, comprising:

Receive the downlink reference signal that each cooperation transmission point sends;

The downlink reference signal sending according to each cooperation transmission point respectively obtains channel matrix and the PMI information of corresponding cooperation transmission point;

Measure from the interference outside cooperation transmission point and noise power sum;

Put corresponding channel matrix and PMI information according to each cooperation transmission respectively, and described interference and noise power sum, calculate 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 method for transmission processing for CQI information, comprising:

Receiving terminal side is according to the CQI information for each cooperation transmission point of above-mentioned the whole bag of tricks feedback;

According to the CQI information of the each cooperation transmission point receiving, carry out respective handling.

A transmitting device for CQI information, comprising:

Receiving element, the downlink reference signal sending for receiving each cooperation transmission point;

The first processing unit, for obtaining respectively channel matrix and the PMI information of corresponding cooperation transmission point according to the downlink reference signal of each cooperation transmission point transmission;

Measuring unit, for measuring from the interference outside cooperation transmission point and noise power sum;

The second processing unit, for putting corresponding channel matrix and PMI information according to each cooperation transmission respectively, and described interference and noise power sum, calculates the CQI information of corresponding cooperation transmission point;

Transmitting element, 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 transmission processing device for CQI information, comprising:

Communication unit, for receiving the CQI information for each cooperation transmission point of above-mentioned various device feedbacks;

Processing unit, for according to the CQI information of the each cooperation transmission point receiving, carries out respective handling.

In the embodiment of the present invention, a kind of production method of the CQI information based on multiple cooperation transmission points is provided and has utilized the CQI information of multiple cooperation transmission points to recalculate the method for the descending CQI of terminal, for the combined dispatching of multiple cooperation transmission points, precoding, and the link circuit self-adapting of terminal, existing CQI information generation method can only produce the CQI information of single transfer point, be difficult to obtain good multipoint cooperative scheduling and precoding result, cannot accurately calculate the descending CQI of scheduling terminal afterwards, and the technical scheme that adopts inventive embodiments to provide, terminal can be put corresponding channel matrix and PMI information according to each cooperation transmission respectively, with measure from the interference outside cooperation transmission point and noise power sum, obtain the CQI information of corresponding cooperation transmission point, then, again the CQI information of each cooperation transmission point is mail to network side, thereby make network side can implement to dispatch more accurately and precoding, and link circuit self-adapting, and then elevator system performance on the whole.

Accompanying drawing explanation

Fig. 1 is prior art figure below cooperative scheduling/precoding schematic diagram;

Fig. 2 is joint transmission schematic diagram under prior art;

Fig. 3 is communication system architectural framework schematic diagram in the embodiment of the present invention;

Fig. 4 is termination function structural representation in the embodiment of the present invention;

Fig. 5 is base station functions structural representation in the embodiment of the present invention;

Fig. 6 is terminal feedback CQI information flow chart in the embodiment of the present invention;

Fig. 7 is that in the embodiment of the present invention, the CQI information of base station based on terminal feedback is carried out respective handling flow chart.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is elaborated.

Consult shown in Fig. 3, Fig. 4 and Fig. 5, in the embodiment of the present invention, communication system (as, LTE-A system), comprise some base stations and terminal, wherein

Terminal comprises receiving element 40, the first processing unit 41, measuring unit 42, the second processing unit 43, transmitting element 44, wherein,

Receiving element 40, the downlink reference signal sending for receiving each cooperation transmission point;

The first processing unit 41, for obtaining respectively channel matrix and the PMI information of corresponding cooperation transmission point according to the downlink reference signal of each cooperation transmission point transmission;

Measuring unit 42, for measuring from the interference outside cooperation transmission point and noise power sum;

The second processing unit 43, for putting corresponding channel matrix and PMI information according to each cooperation transmission respectively, and interference and noise power sum, calculates the CQI information of corresponding cooperation transmission point;

Transmitting element 44, 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.

Base station comprises communication unit 50 and processing unit 51,

Communication unit 50, the CQI information for each cooperation transmission point of feeding back for receiving the device of claim 10-14;

Processing unit 51, for according to the CQI information of the each cooperation transmission point receiving, carries out respective handling.

Based on technique scheme, to consult shown in Fig. 6, in the embodiment of the present 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, the downlink reference signal that each cooperation transmission point sends to terminal is CRS or CSI-RS.

In the present embodiment, the cooperation transmission point set that sends downlink reference signal to terminal j is designated as to c j, j is terminal serial number, terminal needs respectively according to set c jin the downlink reference signal that sends of each cooperation transmission point measure corresponding cooperation transmission and put the CSI of terminal, this CSI at least comprises cooperation transmission point to one or combination in any in CQI, PMI and the RI of terminal, can also comprise relative phase information.

Step 610: the downlink reference signal that terminal sends according to each cooperation transmission point respectively obtains channel matrix and the pre-coding matrix indication PMI information of corresponding cooperation transmission point.

Take any one cooperation transmission point as example, performing step at 610 o'clock, specifically comprise the following steps:

First the downlink reference signal that, terminal sends according to any one cooperation transmission point is constructed respectively the channel matrix of this any one cooperation transmission point on each selected subcarrier.In the present embodiment, the sequence number of any one cooperation transmission point is designated as to i, the sequence number of any one subcarrier is designated as to n, defeated some i of cooperative co 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, wherein N r, jrepresent the reception antenna number of terminal j, N t, irepresent the number of transmit antennas of cooperation transmission point i.

Then, terminal, according to the each channel matrix obtaining, is calculated the corresponding PMI information that obtains.In practical application, for different subcarriers, terminal can adopt different linear reception & disposal matrixes, also can adopt unified linear reception & disposal matrix; In the present embodiment, the linear reception & disposal matrix that terminal j is adopted on subcarrier n is designated as u j, n, terminal j can be by u j, nmultiply each other with the signal matrix receiving at subcarrier n, obtain the signal phasor for subsequent brew demodulation.

For example, terminal j can be according to the each channel matrix obtaining, and adopts formula two directly to calculate and obtains corresponding PMI information, specific as follows:

v ij = ξ ( rsv ( 1 | N | Σ n ∈ N ( H ij , n ) H H ij , n ) ) Formula two

Wherein, v ijrepresent the PMI information of cooperation transmission point i to terminal j, v ijcan be a vector, can be also a matrix (lower same, to repeat no more), and ξ () represents DUAL PROBLEMS OF VECTOR MAPPING to PMI code word; Rsv () represents to get the right main singular vector of matrix, and N represents subcarrier set, | N| represents number of sub carrier wave, H ij, nrepresent defeated some i of cooperative co channel matrix to terminal j on subcarrier n, (.) hrepresent the conjugation transformation of ownership.

The subcarrier set 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 be according to the each channel matrix obtaining and corresponding linear reception & disposal matrix, while 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 ijrepresent the PMI information of cooperation transmission point i to terminal j, ξ () represents DUAL PROBLEMS OF VECTOR MAPPING to PMI code word; Rsv () represents to get the right main singular vector of matrix, and N represents subcarrier set, | N| represents number of sub carrier wave, H ij, nrepresent defeated some i of cooperative co channel matrix to terminal j on subcarrier n, u j, nrepresent the linear reception & disposal matrix that terminal j adopts on subcarrier n, (.) hrepresent the conjugation transformation of ownership.

Step 620: terminal measure from outside cooperation transmission point (from gather c joutside) interference and noise power sum.

In the present embodiment, above-mentioned interference and noise power sum are designated as to I n.

Step 630: terminal is put corresponding channel matrix and PMI information according to each cooperation transmission respectively, and above-mentioned interference and noise power sum, calculate the CQI information of corresponding cooperation transmission point.

Still take any one cooperation transmission point as example, in the present embodiment, performing step at 630 o'clock, terminal can at least be put corresponding channel matrix and PMI information according to interference and noise power sum, above-mentioned any one cooperation transmission of recording, and the linear reception & disposal matrix of local employing, 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:

In the first situation, cooperation transmission point i is main transfer point, so-called main transfer point refers to the cooperation transmission point that sends active data signal in cooperative scheduling/precoding and dynamic transmission point selection to terminal, and a cooperation transmission point to terminal transmission active data signal of being selected by terminal in joint transmission or being defined by base station.In the present embodiment, the main transfer point of terminal j is gathered to c at cooperation transmission point jmiddle sequence number is designated as 0, also like this in subsequent embodiment, will repeat no more.

Now, terminal can be according to the interference recording and noise power sum, and the channel matrix that main transfer point is corresponding and PMI information, and the local linear reception & disposal matrix adopting are calculated the CQI information of main transfer point; Or, terminal also can be according to the received power for non-main transfer point recording, the interference recording and noise power sum, the channel matrix that main transfer point is corresponding and PMI information, and the local linear reception & disposal matrix adopting, calculate the CQI information of main transfer point.

For example, terminal j can adopt formula four to calculate the CQI information of main transfer point, now, and the CQI feedback quantity that the CQI information of main transfer point can only comprise an expression while not considering that cooperation transmission point disturbs, what is called does not consider that cooperation transmission point disturbs, and refers to and only considers set c joutside interference, only consider I n, (lower same, will to repeat no more) is specific as follows:

γ 0j=Q (g ({ γ 0j, n| n ∈ N})) formula four

Wherein, γ 0jrepresent main transfer point to terminal j do not consider cooperation transmission point disturb time CQI feedback quantity, Q (.) represents quantization function, g () represents default CQI mapping function, concrete can be the EESM for averaging (Exponential Effective SINR Mapping, index equivalence SINR mapping function).γ 0j, nrepresent main transfer point on subcarrier n to terminal j do not consider cooperation transmission point disturb time SINR (Signal to Interference plus Noise Ratio), || .|| represents to ask modular arithmetic, H 0j, nrepresent main transfer point channel matrix to terminal j on subcarrier n, u j, nrepresent the linear reception & disposal matrix that terminal j adopts on subcarrier n, v 0jrepresent the PMI information of main transfer point to terminal j, I nrepresent interference and noise power sum outside cooperation transmission point.

Again for example, terminal j can adopt formula five to calculate the CQI information of main transfer point, now, CQI feedback quantity when the CQI information of main transfer point can comprise an expression consideration cooperation transmission point interference and a CQI feedback increment, the increment of the CQI feedback quantity that this CQI feedback increment is CQI feedback quantity while 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 ' 0jrepresent CQI feedback quantity when main transfer point is disturbed to the consideration cooperation transmission point of terminal j, Δ 0jrepresent the γ of main transfer point to terminal j 0jwith respect to γ ' 0jcQI feedback increment, Q (.) represents quantization function, g () represents default CQI mapping function, γ 0j, nrepresent main transfer point on subcarrier n to terminal j do not consider cooperation transmission point disturb time SINR, γ ' 0j, nrepresent SINR when main transfer point is disturbed to the consideration cooperation transmission point of terminal j on subcarrier n, 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, nrepresent the linear reception & disposal matrix that terminal j adopts on subcarrier n, H 0j, nrepresent main transfer point channel matrix to terminal j on subcarrier n, v 0jrepresent the PMI information of main transfer point to terminal j, I nrepresent interference and noise power sum outside cooperation transmission point, I 0, nrepresent set c jthe terminal received power of interior non-main transfer point, can be measured or be calculated by terminal.

In the second situation, cooperation transmission point i is non-main transfer point, now, terminal can be put channel matrix and the PMI information that i is corresponding according to cooperation transmission, the channel matrix that main transfer point is corresponding and PMI information, and the local linear reception & disposal matrix adopting, the CQI information of calculating cooperation transmission point i.In the present embodiment, the corresponding CQI information of each non-main transfer point only describes as an example of a non-main transfer point example herein.

For example, terminal j can adopt the CQI information of formula six any one non-transfer point of calculating, specific as follows:

γ ij=Q (g ({ γ ij, n| n ∈ N})), (i ∈ c j, i ≠ 0) and formula six

Wherein, γ ijrepresent the CQI feedback quantity of cooperation transmission point i (being non-main transfer point) to terminal j, Q (.) represents quantization function, and g () represents default CQI mapping function, γ ij, nrepresent cooperation transmission point i SINR to 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, nrepresent the linear reception & disposal matrix that terminal j adopts on subcarrier n, H 0j, nrepresent main transfer point channel matrix to terminal j on subcarrier n, v 0jrepresent the PMI information of main transfer point to terminal j, H ij, nrepresent cooperation transmission point i (being non-main transfer point) channel matrix to terminal j on subcarrier n, v ijrepresent the PMI information of cooperation transmission point i (being non-main transfer point) to terminal j.

Step 640: the CQI information of each cooperation transmission point is mail to network side by terminal, makes network side carry out respective handling according to the CQI information receiving.

In the present embodiment, terminal, in the time that the CQI information of each cooperation transmission point is mail to network side, can at least mail to the CQI information of each cooperation transmission point the base station of network side by main transfer point, specifically comprise:

If main transfer point is base station, the CQI information of each cooperation transmission point is mail to respectively corresponding cooperation transmission point by terminal, by each cooperation transmission name a person for a particular job receive CQI information mail to base station; Or the CQI information of each cooperation transmission point is directly mail to base station by terminal;

If main transfer point is not base station, the CQI information of each cooperation transmission point is mail to respectively corresponding cooperation transmission point by terminal, by each cooperation transmission name a person for a particular job receive CQI information mail to base station; Or the CQI information of each cooperation transmission point is mail to respectively corresponding cooperation transmission point by terminal, mail to main transfer point by each cooperation transmission CQI information receiving of naming a person for a particular job, then by main transfer point, the CQI information of each cooperation transmission point is mail to base station; Or the CQI information of each cooperation transmission point is directly mail to main transfer point by terminal, by main transfer point, the CQI information of the receipts of each cooperation transmission point is mail to base station.

On the other hand, terminal, sending to base station in the process of CQI information of each cooperation transmission point, can also send PMI information, RI information and relative phase information of each cooperation transmission point etc.Wherein, the feedback system of other information such as PMI information, RI information and relative phase information also can be carried out with reference to the concrete executive mode of step 640, does not repeat them here.

Based on above-described embodiment, base station is receiving after the CQI information of terminal feedback, carry out respective handling to terminal according to the CQI information obtaining, so, consult shown in Fig. 7, in the embodiment of the present invention, it is as follows that the CQI information of base station based on terminal feedback is carried out the detailed process of respective handling:

Step 700: the CQI information for each cooperation transmission point that base station receiving terminal side is fed back according to the variety of way in step 600-step 640,

Corresponding with step 640, in the embodiment of the present invention, performing step at 700 o'clock, base station can, by the CQI information of each cooperation transmission point of at least one cooperation transmission point receiving terminal side feedback, be specially:

If this locality is base station, the corresponding CQI information that receiving terminal sends by each cooperation transmission point, or, the CQI information of each cooperation transmission point that receiving terminal directly sends;

If this locality is not base station, the corresponding CQI information that receiving terminal sends by each cooperation transmission point; Or, the CQI information of each cooperation transmission point that receiving terminal sends by main transfer point.

On the other hand, in the process of the CQI information of each cooperation transmission point that base station sends at receiving terminal, PMI information, RI information and relative phase information of each cooperation transmission point that all right receiving terminal sends etc.Wherein, the receive mode of other information such as PMI information, RI information and relative phase information also can be carried out with reference to the concrete executive mode of step 700, does not repeat them here.

Step 710: respective handling, according to the CQI information of the each cooperation transmission point receiving, is carried out in base station.

In the present embodiment, performing step at 710 o'clock, specifically comprising:

First, base station is according to the CQI information of the each cooperation transmission point receiving and corresponding PMI information, respectively total SINR of computing terminal on each selected subcarrier.

Be specially: base station can the corresponding PMI information of CQI information of each cooperation transmission point based on receiving be dispatched terminal, distribute corresponding running time-frequency resource, then, base station is again according to the CQI information of the each cooperation transmission point receiving and corresponding PMI information, in conjunction with scheduling result and the precoding result of terminal, calculate respectively the total SINR of terminal on each selected subcarrier.Wherein, so-called selected subcarrier refers to when dispatch terminal base station, is each subcarrier of terminal distribution.

For example, in the present embodiment, suppose that base station dispatches terminal j on subcarrier n by the main transfer point of terminal j, meanwhile, suppose that base station dispatched terminal P by the main transfer point of terminal j on subcarrier n simultaneously, be that base station has been dispatched to terminal j and terminal p on same running time-frequency resource, certainly, also can dispatch the more other-end of more number, herein only take one as example, and, will be based on set c jthe terminal set of final scheduling is designated as will be based on set c jthe cooperation transmission point set of final scheduling is designated as s j, s jfor c jsubset, be that 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 during to terminal j transmitted signal on subcarrier n is W ij, n, i ∈ s j, base station can adopt formula seven to carry out 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, represent the total SINR of terminal j on subcarrier n, represent main transfer point to terminal j do not consider cooperation transmission point disturb time CQI information, if terminal j adopt formula four express CQI feedback quantity, if terminal j adopts formula five to express CQI feedback quantity and CQI feedback increment, (.) hrepresent the conjugation transformation of ownership, v 0jrepresent the PMI information of main transfer point to terminal j, W ij, nrepresent the pre-coding matrix that cooperation transmission point i adopts during to terminal j transmitted signal on subcarrier n, W 0p, nrepresent the pre-coding matrix that main transfer point adopts during to terminal P transmitted signal on subcarrier n, terminal p represents the other-end that the main transfer point of terminal j is dispatched on subcarrier n simultaneously, terminal q represents the other-end that the non-main transfer point of terminal j is dispatched on subcarrier n simultaneously, cooperation transmission point l represents the main transfer point of terminal q, herein, also only to have dispatched an other-end as example, γ ljrepresent the CQI feedback quantity of cooperation transmission point l to terminal j, v ljrepresent the PMI information of cooperation transmission point l to terminal j, w lq, nrepresent the pre-coding matrix that cooperation transmission point l adopts during to terminal q transmitted signal on subcarrier n.

Secondly, the total SINR on the each subcarrier obtaining is mapped as unified descending CQI by base station.

In the present embodiment, base station can adopt formula eight to carry out the unified mapping of descending CQI, specific as follows:

γ ^ j = g ( { γ ^ j , n | n ∈ B } ) Formula eight

Wherein, the descending CQI that represents terminal j, g () represents default CQI mapping function, for the total SINR of terminal j on subcarrier n, B represents that base station is the selected subcarrier set of terminal in the time carrying out terminal scheduling, and the frequency band that B is corresponding can be a PRB, subband or whole system frequency band.

Finally, base station is carried out modulating-coding MCS selection according to the descending CQI obtaining to terminal, and the downlink transfer amount of information of definite terminal.

In the embodiment of the present invention, a kind of production method of the CQI information based on multiple cooperation transmission points is provided and has utilized the CQI information of multiple cooperation transmission points to recalculate the method for the descending CQI of terminal, for the combined dispatching of multiple cooperation transmission points, precoding, and the link circuit self-adapting of terminal, existing CQI information generation method can only produce the CQI information of single transfer point, be difficult to obtain good multipoint cooperative scheduling and precoding result, cannot accurately calculate the descending CQI of scheduling terminal afterwards, and the technical scheme that adopts inventive embodiments to provide, terminal can be put corresponding channel matrix and PMI information according to each cooperation transmission respectively, with measure from the interference outside cooperation transmission point and noise power sum, obtain the CQI information of corresponding cooperation transmission point, then, again the CQI information of each cooperation transmission point is mail to network side, thereby make network side can implement to dispatch more accurately 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 and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.

Claims (12)

1. a transmission method for channel quality indicator CQI information, is characterized in that, comprising:
Receive the downlink reference signal that each cooperation transmission point sends;
The downlink reference signal sending according to each cooperation transmission point respectively obtains channel matrix and the pre-coding matrix indication PMI information of corresponding cooperation transmission point;
Measure from the interference outside cooperation transmission point and noise power sum;
Calculate respectively the CQI information of each 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;
Wherein, the described CQI information of calculating respectively each cooperation transmission point, comprising:
If any one cooperation transmission point is main transfer point, according to described interference and noise power sum, the channel matrix that main transfer point is corresponding and PMI information, and corresponding linear reception & disposal matrix, calculate described main transfer point corresponding do not consider cooperation transmission point disturb time CQI feedback quantity; Or, according to the received power for non-main transfer point, described interference and noise power sum, the channel matrix that main transfer point is corresponding and PMI information, and corresponding linear reception & disposal matrix, CQI feedback quantity and CQI feedback increment when calculating consideration cooperation transmission point corresponding to described main transfer point and disturbing, the increment of the CQI feedback quantity of CQI feedback quantity when considering the interference of cooperation transmission point when this CQI feedback incremental representation does not consider that cooperation transmission point disturbs;
If described any one cooperation transmission point is non-main transfer point, according to channel matrix corresponding to this non-main transfer point and PMI information, the channel matrix that main transfer point is corresponding and PMI information, and corresponding linear reception & disposal matrix, calculate the CQI feedback quantity of this non-main transfer point.
2. the method for claim 1, is characterized in that, the downlink reference signal sending according to any one cooperation transmission point obtains channel matrix and the PMI information of this cooperation transmission point, comprising:
The downlink reference signal sending according to described any one cooperation transmission point is constructed respectively the channel matrix of this any one cooperation transmission point on each selected subcarrier;
According to the each channel matrix obtaining, calculate the corresponding PMI information that obtains.
3. 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 at least reported to network side by main transfer point.
4. a method for transmission processing for channel quality indicator CQI information, is characterized in that, comprising:
Receiving terminal side is according to the CQI information for each cooperation transmission point of the method feedback described in claim 1-3 any one;
According to the CQI information of the each cooperation transmission point receiving, carry out respective handling.
5. method as claimed in claim 4, is characterized in that, the CQI information for each cooperation transmission point of receiving terminal side feedback, comprising: the CQI information of the each cooperation transmission point at least feeding back by main transfer point receiving terminal side.
6. the method as described in claim 4 or 5, is characterized in that, according to the CQI information of the each cooperation transmission point receiving, carries out respective handling, comprising:
According to the CQI of the each cooperation transmission point receiving and corresponding PMI information, calculate respectively the total Signal to Interference plus Noise Ratio SINR of described terminal on each selected subcarrier;
Total SINR on the each subcarrier obtaining is mapped as to unified descending CQI;
According to the descending CQI obtaining, terminal is carried out the downlink transfer amount of information of modulating-coding MCS selection and definite terminal;
Wherein, suppose that the pre-coding matrix that cooperation transmission point i adopts during to terminal j transmitted signal on subcarrier n is W ij, n, i ∈ s j, adopt following formula to carry out the total SINR of computing terminal j on subcarrier n:
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 cj , q ≠ j , p γ ^ 0 j γ lj | | V lj H W lq , n | | 2
Wherein, represent the total SINR of terminal j on subcarrier n, represent main transfer point to terminal j do not consider cooperation transmission point disturb time CQI information, v 0jrepresent the PMI information of main transfer point to terminal j, W ij, nrepresent the pre-coding matrix that cooperation transmission point i adopts during to terminal j transmitted signal on subcarrier n, W 0p, nrepresent the pre-coding matrix that main transfer point adopts during to terminal P transmitted signal on subcarrier n, terminal p represents the other-end that the main transfer point of terminal j is dispatched on subcarrier n simultaneously, terminal q represents the other-end that the non-main transfer point of terminal j is dispatched on subcarrier n simultaneously, cooperation transmission point 1 represents the main transfer point of terminal q, wherein computing formula be:
If terminal j adopts formula four to express CQI feedback quantity,
If terminal j adopts formula five to express CQI feedback quantity and CQI feedback increment, (.) hrepresent the conjugation transformation of ownership;
Described formula four is: γ 0j=Q (g ({ γ 0j, n| n ∈ N}))
Wherein, γ 0jrepresent main transfer point to terminal j do not consider cooperation transmission point disturb time CQI feedback quantity, Q (.) represents quantization function, g () represents default CQI mapping function, γ 0j, nrepresent main transfer point on subcarrier n to terminal j do not consider that cooperation transmission point disturbs time letter dry than SINR, || || represent to ask modular arithmetic, H 0j, nrepresent main transfer point channel matrix to terminal j on subcarrier n, u j,nrepresent the linear reception & disposal matrix that terminal j adopts on subcarrier n, v 0jrepresent the PMI information of main transfer point to terminal j, I nrepresent interference and noise power sum outside cooperation transmission point;
Described formula five is: 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 } ) )
Wherein, γ ' 0jrepresent CQI feedback quantity when main transfer point is disturbed to the consideration cooperation transmission point of terminal j, Δ 0jrepresent the γ of main transfer point to terminal j 0jwith respect to γ ' 0jcQI feedback increment, Q (.) represents quantization function, g () represents default CQI mapping function, γ 0j, nrepresent main transfer point on subcarrier n to terminal j do not consider cooperation transmission point disturb time SINR, γ ' 0j, nrepresent SINR when main transfer point is disturbed to the consideration cooperation transmission point of terminal j on subcarrier n, 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,nrepresent the linear reception & disposal matrix that terminal j adopts on subcarrier n, H 0j, nrepresent main transfer point channel matrix to terminal j on subcarrier n, v 0jrepresent the PMI information of main transfer point to terminal j, I nrepresent interference and noise power sum outside cooperation transmission point, I 0, nrepresent set c jthe terminal received power of interior non-main transfer point.
7. a transmitting device for channel quality indicator CQI information, is characterized in that, comprising:
Receiving element, the downlink reference signal sending for receiving each cooperation transmission point;
The first processing unit, the channel matrix and the pre-coding matrix that obtain corresponding cooperation transmission point for the downlink reference signal sending according to each cooperation transmission point are respectively indicated PMI information;
Measuring unit, for measuring from the interference outside cooperation transmission point and noise power sum;
The second processing unit, for putting corresponding channel matrix and PMI information according to each cooperation transmission respectively, and described interference and noise power sum, calculates the CQI information of corresponding cooperation transmission point;
Transmitting element, 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;
Wherein, the described CQI information of calculating respectively each cooperation transmission point, comprising:
If any one cooperation transmission point is main transfer point, according to described interference and noise power sum, the channel matrix that main transfer point is corresponding and PMI information, and corresponding linear reception & disposal matrix, calculate described main transfer point corresponding do not consider cooperation transmission point disturb time CQI feedback quantity; Or, according to the received power for non-main transfer point, described interference and noise power sum, the channel matrix that main transfer point is corresponding and PMI information, and corresponding linear reception & disposal matrix, CQI feedback quantity and CQI feedback increment when calculating consideration cooperation transmission point corresponding to described main transfer point and disturbing, the increment of the CQI feedback quantity of CQI feedback quantity when considering the interference of cooperation transmission point when this CQI feedback incremental representation does not consider that cooperation transmission point disturbs;
If described any one cooperation transmission point is non-main transfer point, according to channel matrix corresponding to this non-main transfer point and PMI information, the channel matrix that main transfer point is corresponding and PMI information, and corresponding linear reception & disposal matrix, calculate the CQI feedback quantity of this non-main transfer point.
8. device as claimed in claim 7, is characterized in that, the downlink reference signal that described the first processing unit sends according to any one cooperation transmission point obtains channel matrix and the PMI information of this cooperation transmission point, comprising:
The downlink reference signal that described the first processing unit sends according to described any one cooperation transmission point is constructed respectively the channel matrix of this any one cooperation transmission point on each selected subcarrier;
Described the first processing unit, according to the each channel matrix obtaining, calculates the corresponding PMI information that obtains.
9. install as claimed in claim 7 or 8, it is characterized in that, when the CQI information of each cooperation transmission point is mail to network side by described transmitting element, the CQI information of each cooperation transmission point is at least reported to network side by main transfer point.
10. a transmission processing device for channel quality indicator CQI information, is characterized in that, comprising:
Communication unit, for receiving the CQI information for each cooperation transmission point of the device feedback described in claim 7-9 any one;
Processing unit, for according to the CQI information of the each cooperation transmission point receiving, carries out respective handling.
11. devices as claimed in claim 10, is characterized in that, when the CQI information for each cooperation transmission point of described communication unit receiving terminal side feedback, and the CQI information of the each cooperation transmission point at least feeding back by main transfer point receiving terminal side.
12. devices as claimed in claim 11, is characterized in that, described processing unit, according to the CQI information of the each cooperation transmission point receiving, carries out respective handling, comprising:
Described processing unit, according to the CQI of the each cooperation transmission point receiving and corresponding PMI information, calculates respectively the total Signal to Interference plus Noise Ratio SINR of described terminal on each selected subcarrier;
The total SINR on the each subcarrier obtaining is mapped as unified descending CQI by described processing unit;
Described processing unit carries out the downlink transfer amount of information of modulating-coding MCS selection and definite terminal to terminal according to the descending CQI obtaining;
Wherein, suppose that the pre-coding matrix that cooperation transmission point i adopts during to terminal j transmitted signal on subcarrier n is W ij, n, i ∈ s j, adopt following formula to carry out the total SINR of computing terminal j on subcarrier n:
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 cj , q ≠ j , p γ ^ 0 j γ lj | | V lj H W lq , n | | 2
Wherein, represent the total SINR of terminal j on subcarrier n, represent main transfer point to terminal j do not consider cooperation transmission point disturb time CQI information, v 0jrepresent the PMI information of main transfer point to terminal j, W ij, nrepresent the pre-coding matrix that cooperation transmission point i adopts during to terminal j transmitted signal on subcarrier n, W 0p, nrepresent the pre-coding matrix that main transfer point adopts during to terminal P transmitted signal on subcarrier n, terminal p represents the other-end that the main transfer point of terminal j is dispatched on subcarrier n simultaneously, terminal q represents the other-end that the non-main transfer point of terminal j is dispatched on subcarrier n simultaneously, cooperation transmission point 1 represents the main transfer point of terminal q, wherein computing formula be:
If terminal j adopts formula four to express CQI feedback quantity,
If terminal j adopts formula five to express CQI feedback quantity and CQI feedback increment, (.) hrepresent the conjugation transformation of ownership;
Described formula four is: γ 0j=Q (g ({ γ 0j, n| n ∈ N}))
Wherein, γ 0jrepresent main transfer point to terminal j do not consider cooperation transmission point disturb time CQI feedback quantity, Q (.) represents quantization function, g () represents default CQI mapping function, γ 0j, nrepresent main transfer point on subcarrier n to terminal j do not consider that cooperation transmission point disturbs time letter dry than SINR, || || represent to ask modular arithmetic, H 0j, nrepresent main transfer point channel matrix to terminal j on subcarrier n, u j,nrepresent the linear reception & disposal matrix that terminal j adopts on subcarrier n, v 0jrepresent the PMI information of main transfer point to terminal j, I nrepresent interference and noise power sum outside cooperation transmission point;
Described formula five is: 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 } ) )
Wherein, γ ' 0jrepresent CQI feedback quantity when main transfer point is disturbed to the consideration cooperation transmission point of terminal j, Δ 0jrepresent the γ of main transfer point to terminal j 0jwith respect to γ ' 0jcQI feedback increment, Q (.) represents quantization function, g () represents default CQI mapping function, γ 0j, nrepresent main transfer point on subcarrier n to terminal j do not consider cooperation transmission point disturb time SINR, γ ' 0j, nrepresent SINR when main transfer point is disturbed to the consideration cooperation transmission point of terminal j on subcarrier n, 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,nrepresent the linear reception & disposal matrix that terminal j adopts on subcarrier n, H 0j, nrepresent main transfer point channel matrix to terminal j on subcarrier n, v 0jrepresent the PMI information of main transfer point to terminal j, I nrepresent interference and noise power sum outside cooperation transmission point, I 0, nrepresent set c jthe terminal received power of interior non-main transfer point.
CN201110235226.6A 2011-08-16 2011-08-16 Method and device for transmitting CQI (channel quality indicator) information CN102291839B (en)

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