CN102291740B - Method and device for transmitting channel quality indication (CQI) - Google Patents

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

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CN102291740B
CN102291740B CN201110234923.XA CN201110234923A CN102291740B CN 102291740 B CN102291740 B CN 102291740B CN 201110234923 A CN201110234923 A CN 201110234923A CN 102291740 B CN102291740 B CN 102291740B
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cqi
transfer point
channel matrix
point
base station
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CN102291740A (en
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倪浩
高秋彬
彭莹
张然然
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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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Priority to PCT/CN2012/079847 priority patent/WO2013023543A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link

Abstract

The invention discloses a method for transmitting channel quality indication (CQI), which is used for realizing transmission of the CQI aiming at multiple transmission points so as to improve the accuracy of scheduling and reduce interferences between neighbor cells. The method comprises the following steps of: receiving reference signals transmitted by multiple transmission points; by aiming at each transmission point, constructing a channel matrix Hij, n according to the reference signal transmitted by the transmission point; measuring the sum In of interferences and system noise power outside the multiple transmission points; calculating the CQI of a main transmission point according to the channel matrix H0j, n of the main transmission point in the multiple transmission points and the In, and by aiming at each collaborative transmission point except the main transmission point in the multiple transmission points, calculating the CQI of the collaborative transmission point according to the H0j, n of the main transmission point and the Hij, n of the collaborative transmission point; and at least transmitting the calculated CQI of the multiple transmission points to the main transmission point. The invention also discloses a device for implementing the method.

Description

A kind of method and device that transmits CQI
Technical field
The present invention relates to the communications field, particularly relate to the method and the device that transmit CQI.
Background technology
In order to assist base station to carry out user's scheduling and link circuit self-adapting, in LTE (Long Term Evolution) system, terminal needs reporting base station to arrive the channel quality indication (CQI) information (CQI) of this terminal.Corresponding regular hour of each CQI and frequency resource.Subscriber equipment (UE) need to be according to cell special reference (the cell-specific reference signals of base station transmitting, or channel state information reference signals (channel-stateinformation reference signals CRS), etc. CSI-RS) reference signal is measured, and calculates and feedback CQI.Feedback comprises periodic feedback and non-periodic feedback.Periodic feedback comprises 1-0,2-0,1-1 and 2-1 totally 4 kinds of feedback models, and these feedback models comprise 1 altogether, 1a, 2,2a, 2b, 2c, 3,4,5 and 6 reporting types in totally 9.Wherein in reporting types 1,1a, 2,2b, 2c and 4 reporting information, comprise channel quality indication (CQI) information.Non-periodic feedback has comprised 1-2,2-0,2-2,3-0,3-1 totally 5 kinds of feedback models, all comprises channel quality indication (CQI) information feedback in these feedback models.
Another kind of mode is, in TDD (time division duplex) system, base station can be according to detection reference signal (the sounding reference symbol of UE transmitting, SRS) measure the uplink channel information of UE to base station, then utilize channel reciprocity to obtain the descending channel information of base station to UE.Or simultaneously with reference to CQI and to the measurement result of SRS to operations such as UE dispatch.
Proposed at present coordinated multipoint transmission technology, this technology is the cooperation between the multiple transfer points that separate on geographical position.Multiple transfer points comprise the base station of different districts and multiple RRH (long distance wireless head) that base station is controlled.Coordinated multipoint transmission technology can be divided into descending cooperation transmission and up combine reception.
But the existing CQI recording and the measurement to SRS, be all for single transmission point, there is no the measurement scheme for multiple transfer points.If utilize existing CQI and the measurement result to SRS, by the accuracy of the operations such as impact scheduling and link circuit self-adapting adjustment.
Summary of the invention
The embodiment of the present invention provides method and the device of a kind of CQI of transmission, for realizing the transmission for the CQI of many transfer points, to improve the accuracy of scheduling, reduces the interference between adjacent area.
Transmit a method of CQI, be applied in UE side, comprise the following steps:
Receive the reference signal that multiple transfer points send;
For each transfer point, the reference signal structure channel matrix H sending according to this transfer point ij, n;
Measure from the interference outside described multiple transfer points and system noise power sum I n;
According to the channel matrix H of main transfer point in multiple transfer points 0j, nand I ncalculate the channel quality indicator (CQI) of this main transfer point, and for the each cooperation transmission point except main transfer point in multiple transfer points, according to the H of main transfer point 0j, nh with this cooperation transmission point ij, ncalculate the channel quality indicator (CQI) of this cooperation transmission point;
The CQI that calculates described multiple transfer points is at least sent to main transfer point.
A method of transmitting CQI, is applied to network side, comprises the following steps:
Main transfer point receives the CQI that user equipment (UE) sends, and this CQI is according to main transfer point H ij, nand I ncalculate H ij, naccording to the channel matrix of the reference signal structure of main transfer point transmission, I ncome interference and system noise power sum outside the place transfer point set of autonomous transfer point;
Modulation coding mode MCS selection is carried out according to the CQI obtaining in base station corresponding to main transfer point.
A kind of user equipment (UE), comprising:
Interface module, the reference signal sending for receiving multiple transfer points;
Constructing module, for for each transfer point, constructs channel matrix H according to the reference signal of this transfer point transmission ij, n;
Measurement module, for measuring from the interference outside described multiple transfer points and system noise power sum I n;
Computing module, for according to the H of the main transfer point of multiple transfer points 0j, nand I ncalculate the channel quality indicator (CQI) of this main transfer point, and for the each cooperation transmission point except main transfer point in multiple transfer points, according to the H of main transfer point 0j, nh with this cooperation transmission point ij, ncalculate the channel quality indicator (CQI) of this cooperation transmission point, and indicate interface module that the CQI that calculates described multiple transfer points is at least sent to main transfer point.
A kind of base station, comprising:
Interface module, the CQI sending for receiving user equipment (UE), this CQI is according to main transfer point H ij, nand I ncalculate H ij, naccording to the channel matrix of the reference signal structure of main transfer point transmission, I ncome interference and system noise power sum outside the place transfer point set of autonomous transfer point;
Control module, for carrying out MCS selection according to the CQI obtaining.
A kind of transfer point equipment, comprising:
First interface module, the CQI sending for receiving user equipment (UE), this CQI is according to main transfer point H ij, nand I ncalculate H ij, naccording to the channel matrix of the reference signal structure of main transfer point transmission, I ncome interference and system noise power sum outside the place transfer point set of autonomous transfer point;
The second interface module, for the CQI receiving is transmitted to corresponding base station, makes base station carry out MCS selection according to the CQI obtaining.
In the embodiment of the present invention, calculate CQI for multiple transfer points, especially consider interference and system noise power sum outside multiple transfer points, the CQI obtaining like this makes the operation such as scheduling and link circuit self-adapting adjustment in coordinated multipoint transmission more accurate.
Accompanying drawing explanation
Fig. 1 is the method flow diagram of UE transmission CQI in the embodiment of the present invention;
Fig. 2 is the main method flow chart of network side transmission CQI in the embodiment of the present invention;
Fig. 3 is the detailed method flow chart of network side transmission CQI in the embodiment of the present invention;
Fig. 4 is the structure chart of UE in the embodiment of the present invention;
Fig. 5 is the primary structure figure of base station in the embodiment of the present invention;
Fig. 6 is the detailed structure view of base station in the embodiment of the present invention;
Fig. 7 is the primary structure figure of transfer point equipment in the embodiment of the present invention;
Fig. 8 is the detailed structure view of transfer point equipment in the embodiment of the present invention.
Embodiment
In the embodiment of the present invention, calculate CQI for multiple transfer points, especially consider interference and system noise power sum outside multiple transfer points, the CQI obtaining like this makes the operation such as scheduling and link circuit self-adapting adjustment in coordinated multipoint transmission more accurate.
In the present embodiment, multiple transfer points form transfer point set c j, the multiple transfer points in the present embodiment refer to transfer point set c in other words jin transfer point.Certain UE relatively, transfer point set c ja transfer point be main transfer point, other transfer point is cooperation transmission point.Main transfer point refers to the transfer point that sends useful signal in cooperative scheduling/wave beam forming and dynamic transmission point selection to UE, the transfer point to UE transmission useful signal that specify base station or UE selects in joint transmission.If there is the transfer point of multiple transmission useful signals, main transfer point is in the transfer point of the plurality of transmission useful signal, by specifying or UE selects base station.Transfer point can base station or the equipment such as RRH.
Referring to Fig. 1, the method flow that transmits CQI in the present embodiment is as follows:
Step 101: receive the reference signal that multiple transfer points send.Reference signal comprises CRS or CSI-RS etc.
Step 102: for each transfer point, the reference signal structure channel matrix H sending according to this transfer point ij, n.
Step 103: measure from the interference outside described multiple transfer points and system noise power sum I n.
Step 104: according to the channel matrix H of main transfer point in multiple transfer points 0j, nand I ncalculate the channel quality indicator (CQI) of this main transfer point, and for the each cooperation transmission point except main transfer point in multiple transfer points, according to the H of main transfer point 0j, nh with this cooperation transmission point ij, ncalculate the channel quality indicator (CQI) of this cooperation transmission point.
Step 105: the CQI that calculates described multiple transfer points is at least sent to main transfer point.Concrete, the CQI of the each transfer point calculating is sent to respectively to corresponding transfer point, and the cooperation transmission CQI receiving that names a person for a particular job is transmitted to main transfer point or base station corresponding to main transfer point.Or, the CQI of all transfer points that calculate is directly sent to main transfer point, send to corresponding base station by main transfer point.
Above flow process is realized by UE, and the CQI calculating is at least sent to main transfer point.
Concrete, UE receives transfer point set c jthe reference signal that each transfer point in (for the transfer point set of UEj) sends.By the reference signal structure channel matrix H of receiving ij, n, the dimension of this matrix is N r, j× N t, i, wherein N r, jrepresent UEj reception antenna number, N t, irepresent transfer point i number of transmit antennas.And measure from the interference outside described multiple transfer points and system noise power sum I n.Then by formula γ 0j=Q (g ({ γ 0j, n| n ∈ N})) calculate the CQI of main transfer point, wherein, the sequence number of establishing main transfer point is 0, γ 0jrepresent the CQI of main transfer point,
Figure BDA0000083707360000051
h 0j, nrepresent the channel matrix of main transfer point.G () represents CQI mapping function, that concrete can be EESM (exponential effective SINR mapping, the effective Signal to Interference plus Noise Ratio mapping of index) mapping function, N represents subcarrier set, and its corresponding frequency range can be a Resource Block, subband or whole system frequency range.Q () represents quantization function, ‖ ‖ representing matrix delivery, acquisition be signal power.The formula that calculates the CQI of certain the cooperation transmission point except main transfer point is γ ij=Q (g ({ γ ij, n| n ∈ N})), (i ∈ c j, i ≠ 0), wherein
Figure BDA0000083707360000052
(i ∈ c j, i ≠ 0).Consider that base station obtains channel matrix and is difficult to be dispatched to the scene of synchronization from multiple transfer points, the CQI feedback that base station need obtain cooperation transmission point, can effectively improve the accuracy of scheduling for this scene like this.If base station obtains channel matrix and can be dispatched to synchronization from multiple transfer points, or base station obtains the channel matrix of multiple transfer points from UE, can not obtain the CQI feedback of cooperation transmission point.
UE can also further calculate CQI increment for main transfer point, and computing formula is:
Δ 0j=Q (g ({ γ 0j, n| n ∈ N})/g (γ ' 0j, n| n ∈ N})), wherein i 0, nfor user measures or calculates set c jin except main transfer point user's received power sum of other transfer point.CQI increment is the increment of CQI of the CQI while not considering that cooperation cell is disturbed while relatively considering that cooperation cell is disturbed.Consider quantizing range, transmission CQI increment can improve the precision of CQI feedback.
If UE has reported CQI increment, preferably, the computing formula of the CQI being used in conjunction with CQI increment is γ 0j=Q (g (γ ' 0j, n|n ∈ N})).
Because the present embodiment provides CQI increment, therefore need existing feedback model and feedback kind to improve, or define new feedback kind.
The feedback model and/or the feedback kind that adopt to main transfer point feedback of down channel information comprise CQI increment size.The feedback model of periodic feedback and feedback kind are supported CQI increment information feedback; The feedback model of non-periodic feedback is supported CQI increment information feedback.Concrete, for example 5 kinds of feedback models of Physical Uplink Shared Channel (physical uplink shared channel, PUSCH) being expanded, feedback model 1-2 is to comprising broadband CQI increment size in the feedback of main transfer point.Feedback model 3-0 and 3-1 are to the CQI increment size that comprises each subband in sets of subbands in the feedback of main transfer point.Feedback model 2-0 and 2-2 are to a CQI increment size on the subband that comprises M size in the feedback of main transfer point and select for the UE of k, and M and k are parameter preset.
Or, in PUCCH periodic feedback, increase new feedback kind, make the feedback kind of periodic feedback support CQI increment information feedback.For example, define new feedback kind, this new feedback kind is on the basis of feedback kind 1b, 1c, 1d, to support respectively subband PMI, CQI and CQI increment, or subband CQI and CQI increment, or subband CQI increment information feedback.And for example, define new feedback kind, this new feedback kind is on the basis of feedback kind 2d, to support broadband P MI, CQI and CQI increment information feedback; And for example, define new feedback kind, this new feedback kind is on the basis of feedback kind 4a, 4b, to support respectively broadband CQI and CQI increment, or broadband CQI increment information feedback.
Network side can be according to operations such as this CQI dispatch, referring to the following examples after receiving CQI.
Referring to Fig. 2, in the present embodiment, the main method flow process of network side transmission CQI is as follows:
Step 201: main transfer point receives the CQI that user equipment (UE) sends, and this CQI is according to main transfer point H ij, nand I ncalculate H ij, naccording to the channel matrix of the reference signal structure of main transfer point transmission, I ncome interference and system noise power sum outside the place transfer point set of autonomous transfer point.
Step 202: base station corresponding to main transfer point carried out MCS (modulation coding mode) according to the CQI obtaining and selected.If main transfer point is base station, directly obtains CQI and carry out MCS selection.If main transfer point is not base station, the CQI receiving is transmitted to base station, carry out MCS selection by base station according to the CQI obtaining.
If dispatch UE after obtaining CQI base station, in order to improve accuracy, CQI need be calculated again, referring to the following examples.
Referring to Fig. 3, in the present embodiment, the detailed method flow process of network side transmission CQI is as follows:
Step 301: base station obtains the CQI of multiple transfer points.For example, base station obtains CQI from multiple transfer points.Or base station obtains the CQI of multiple transfer points from main transfer point.
Step 302: base station obtains the channel matrix of multiple transfer points for example, described base station obtains channel matrix from multiple transfer points or described base station obtains the channel matrix about multiple transfer points from UE or described base station obtains the channel matrix about multiple transfer points from main transfer point
Figure BDA0000083707360000074
Base station can also be according to the CQI that receives to the same transfer point of correspondence
Figure BDA0000083707360000075
adjust, obtain the channel matrix after adjusting
Figure BDA0000083707360000076
or base station obtains channel matrix from multiple transfer points, be each transfer point according to the CQI receiving to the same transfer point of correspondence channel matrix after adjusting
Step 303: interference and the system noise power sum outside the transfer point set of autonomous transmission point place calculated according to the channel matrix of the main transfer point of the CQI receiving and acquisition in base station
Figure BDA0000083707360000079
if receive CQI increment, base station calculates according to the CQI receiving and the channel matrix of CQI increment and acquisition
Figure BDA00000837073600000710
Step 304: base station according to the channel matrix, pre-coding matrix of the multiple transfer points that obtain and
Figure BDA00000837073600000711
recalculate CQI.If computation complexity allows, base station can be according to the channel matrix, pre-coding matrix, linearity test matrix that obtain and
Figure BDA00000837073600000712
recalculate CQI.
Step 305: MCS selection is carried out according to the CQI calculating in base station.
The present embodiment is applicable to base station and carries out cooperative scheduling or joint transmission, also can be for single cell scheduling or transmission.Can obviously improve the precision of CQI for single cell scheduling or transmission.
Below the embodiment shown in Fig. 3 is elaborated.
Base station obtains the CQI information γ of multiple transfer points ij, and obtain the channel matrix of multiple transfer points
Figure BDA00000837073600000713
base station is to channel matrix
Figure BDA0000083707360000081
the formula of adjusting is:
Figure BDA0000083707360000083
represent the channel matrix of main transfer point,
Figure BDA0000083707360000084
represent the channel matrix after adjusting.If channel matrix is adjusted by transfer point, also adopt this formula.This adjustment be based on UE to base station the transmitting power of (or transfer point), therefore adjust mode not unique, for example can use with on average adjusting on subcarrier set N.Base station can utilize the channel matrix after adjusting to carry out user's scheduling, and calculates the pre-coding matrix of each transfer point.
Suppose on subcarrier n, user j to be dispatched, the transfer point quantity that sends useful signal to user j is M, M>=1, and transfer point set is s j,
Figure BDA0000083707360000087
if transfer point set c jthe set of interior final dispatched users is the precoding of base station calculates transfer point set s jin transfer point i be W to the pre-coding matrix of user j transmitted signal ij, n, i ∈ s j.Interference and the system noise power sum outside the transfer point set of autonomous transmission point place calculated for main transfer point in base station
Figure BDA0000083707360000089
formula be:
Figure BDA00000837073600000810
if CQI increment is received in base station, formula is then SINR is calculated in base station, and in the situation that considering maximum merging, formula is
Figure BDA00000837073600000812
Figure BDA00000837073600000813
represent the SINR calculating.If computational complexity allows, utilize linearity test matrix computations SINR, formula is
the SINR on each subcarrier is mapped to a single CQI value by base station, SINR quantized, and formula is
Figure BDA00000837073600000815
γ jrepresent the CQI that finally calculates, B represents the subcarrier set of base station scheduling, and its corresponding frequency band can be a Resource Block, subband or whole system frequency band.Base station, according to the user CQI recalculating, can determine the modulation coding mode of user's downlink transfer use and the size of transmission information amount.
The implementation procedure of having understood transmission CQI by above description, this process is mainly realized by UE, transfer point and base station, and the built-in function to these three equipment and result are introduced below.
Referring to Fig. 4, in the present embodiment, UE comprises: interface module 401, constructing module 402, measurement module 403 and computing module 404.
The reference signal that interface module 401 sends for receiving multiple transfer points.
Constructing module 402, for for each transfer point, is constructed channel matrix H according to the reference signal of this transfer point transmission ij, n.
Measurement module 403 is for measuring from the interference outside described multiple transfer points and system noise power sum I n.
Computing module 404 is for according to the H of the main transfer point of multiple transfer points 0j, nand I ncalculate the channel quality indicator (CQI) of this main transfer point, and for the each cooperation transmission point except main transfer point in multiple transfer points, according to the H of main transfer point 0j, nh with this cooperation transmission point ij, nthe channel quality indicator (CQI) of this cooperation transmission point, and indicate interface module 401 that the CQI that calculates described multiple transfer points is at least sent to main transfer point.
Computing module 404 is also for according to the H of main transfer point 0j, nand I ncalculate the CQI increment of this main transfer point, and indicate interface module that the CQI increment calculating is at least sent to main transfer point.CQI increment is the increment of CQI of the CQI while not considering that cooperation cell is disturbed while relatively considering that cooperation cell is disturbed.The CQI of the each transfer point calculating is sent to respectively corresponding transfer point by interface module 401, and the cooperation transmission CQI receiving that names a person for a particular job is transmitted to main transfer point; Or, the CQI of all transfer points that calculate is directly sent to main transfer point.
The feedback model and/or the feedback kind that adopt to main transfer point feedback of down channel information comprise CQI increment size.The feedback model of periodic feedback and feedback kind are supported CQI increment information feedback; The feedback model of non-periodic feedback is supported CQI increment information feedback.For example, feedback model 1-2 is to comprising broadband CQI increment size in the feedback of main transfer point.Feedback model 3-0 and 3-1 are to the CQI increment size that comprises each subband in sets of subbands in the feedback of main transfer point.Feedback model 2-0 and 2-2 are to a CQI increment size on the subband that comprises M size in the feedback of main transfer point and select for the UE of k, and M and k are parameter preset.The feedback kind of periodic feedback is supported CQI increment information feedback.
Referring to Fig. 5, in the present embodiment, base station comprises: interface module 501 and control module 502.In the present embodiment, base station comprises the function as main transfer point.
The CQI that interface module 501 sends for receiving user equipment (UE), this CQI is according to main transfer point H 0j, nand I ncalculate H 0j, naccording to the channel matrix of the reference signal structure of main transfer point transmission, I ncome interference and system noise power sum outside the place transfer point set of autonomous transfer point.
Control module 502 is for carrying out MCS selection according to the CQI obtaining.
While described UE having been carried out to scheduling after control module 502 is being received CQI, described base station also comprises: computing module 503, and shown in Figure 6.Computing module 503 is for recalculating CQI.Control module 502 is carried out MCS selection according to the CQI calculating.
Interface module 501 is also for obtaining the channel matrix of multiple transfer points computing module 503 calculates interference and the system noise power sum outside the transfer point set of autonomous transmission point place according to the channel matrix of main transfer point in multiple transfer points of the CQI receiving and acquisition
Figure BDA0000083707360000102
according to the channel matrix, pre-coding matrix of the multiple transfer points that obtain and
Figure BDA0000083707360000103
recalculate CQI.Wherein, interface module 501 obtains channel matrix from multiple transfer points
Figure BDA0000083707360000104
or, obtain the channel matrix about multiple transfer points from UE
Figure BDA0000083707360000105
Computing module 503 also for according to the CQI that receives to the same transfer point of correspondence adjust, obtain the channel matrix after adjusting
Figure BDA0000083707360000107
or interface module 501 obtains channel matrix from multiple transfer points, be each transfer point according to the CQI receiving to the same transfer point of correspondence
Figure BDA0000083707360000108
channel matrix after adjusting
Figure BDA0000083707360000109
Computing module 503 can calculate according to the channel matrix of the CQI receiving and CQI increment and acquisition
Figure BDA00000837073600001010
in addition, computing module 503 can be according to the channel matrix, pre-coding matrix, linearity test matrix that obtain and recalculate CQI.
Referring to Fig. 7, in the present embodiment, transfer point equipment comprises: first interface module 701 and the second interface module 702.In the present embodiment, transfer point equipment is not base station, as is the equipment such as RRH.
The CQI that first interface module 701 sends for receiving user equipment (UE), this CQI is according to main transfer point H 0j, nand I ncalculate H 0j, naccording to the channel matrix of the reference signal structure of main transfer point transmission, I ncome interference and system noise power sum outside the place transfer point set of autonomous transfer point.
The second interface module 702, for the CQI receiving is transmitted to corresponding base station, makes base station carry out MCS selection according to the CQI obtaining.
The second interface module 702 is also for obtaining the channel matrix about multiple transfer points
Figure BDA0000083707360000111
and the channel matrix of acquisition is sent to corresponding base station.Concrete, the second interface module obtains channel matrix from other transfer point and this locality or, obtain the channel matrix about multiple transfer points by first interface module from UE
Figure BDA0000083707360000113
Described transfer point equipment also comprises: adjusting module 703, and shown in Figure 8.Adjusting module 703 for according to the CQI that receives to the same transfer point of correspondence
Figure BDA0000083707360000114
adjust, obtain the channel matrix after adjusting
Figure BDA0000083707360000115
or the second interface module 702 obtains channel matrix from other transfer point, be each transfer point according to the CQI receiving to the same transfer point of correspondence
Figure BDA0000083707360000116
channel matrix after adjusting
Figure BDA0000083707360000117
In the embodiment of the present invention, calculate CQI for multiple transfer points, especially consider interference and system noise power sum outside multiple transfer points, the CQI obtaining like this makes the operation such as scheduling and link circuit self-adapting adjustment in coordinated multipoint transmission more accurate.The embodiment of the present invention is also by channel matrix and linearity test matrix computations CQI after CQI increment, adjustment, improved accuracy and the precision of CQI from multiple angles, and then the accuracy of the operation such as base station scheduling and link circuit self-adapting adjustment while having improved coordinated multipoint transmission.And the embodiment of the present invention has improved multiple implementation in multiple links, can reduce load of base station or reduce network transmission resource.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, completely implement software example or the form in conjunction with the embodiment of software and hardware aspect.And the present invention can adopt the form at one or more upper computer programs of implementing of computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) that wherein include computer usable program code.
The present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, equipment (system) and computer program.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction that makes to carry out by the processor of computer or other programmable data processing device produces the device for realizing the function of specifying at flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame on computer or other programmable devices.
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 (28)

1. a method of transmitting CQI, is characterized in that, comprises the following steps:
Receive the reference signal that multiple transfer points send;
For each transfer point, the reference signal structure channel matrix H sending according to this transfer point ij, n;
Measure from the interference outside described multiple transfer points and system noise power sum I n;
According to the channel matrix H of main transfer point in multiple transfer points 0j, nand I ncalculate the channel quality indicator (CQI) of this main transfer point, and for the each cooperation transmission point except main transfer point in multiple transfer points, according to the H of main transfer point 0j, nh with this cooperation transmission point ij, ncalculate the channel quality indicator (CQI) of this cooperation transmission point;
The CQI that calculates described multiple transfer points is at least sent to main transfer point.
2. the method for claim 1, is characterized in that, also comprises step: according to the H of main transfer point 0j, nand I ncalculate the CQI increment of this main transfer point, and the CQI increment calculating is at least sent to main transfer point.
3. method as claimed in claim 2, is characterized in that, CQI increment is the increment that the CQI while not considering that cooperation transmission point disturbs considers the CQI in cooperation transmission point when interference relatively.
4. method as claimed in claim 2, is characterized in that, the feedback model and/or the feedback kind that adopt to main transfer point feedback of down channel information comprise CQI increment size.
5. method as claimed in claim 4, is characterized in that, the feedback model of periodic feedback and feedback kind are supported CQI increment information feedback; The feedback model of non-periodic feedback is supported CQI increment information feedback.
6. method as claimed in claim 2, is characterized in that, according to the H of main transfer point in multiple transfer points 0j, nand I nthe step of calculating the channel quality indicator (CQI) of this main transfer point comprises: according to the H of main transfer point in multiple transfer points 0j, n, I nwith user's received power sum of cooperation transmission point in described multiple transfer points, calculate the channel quality indicator (CQI) of this main transfer point.
7. the method for claim 1, is characterized in that, at least sends to the step of main transfer point to comprise the CQI that calculates described multiple transfer points:
The CQI of the each transfer point calculating is sent to respectively to corresponding transfer point, and the cooperation transmission CQI receiving that names a person for a particular job is transmitted to main transfer point; Or
The CQI of all transfer points that calculate is directly sent to main transfer point.
8. a method of transmitting CQI, is characterized in that, comprises the following steps:
Main transfer point receives the CQI that user equipment (UE) sends, and this CQI is according to main transfer point H 0j, nand I ncalculate H 0j, naccording to the channel matrix of the reference signal structure of main transfer point transmission, I ncome interference and system noise power sum outside the place transfer point set of autonomous transfer point;
Modulation coding mode MCS selection is carried out according to the CQI obtaining in base station corresponding to main transfer point;
Main transfer point receives after the CQI of user equipment (UE) transmission, if dispatch described UE described base station, also comprises step: CQI is recalculated in base station corresponding to main transfer point; The step that MCS selection is carried out according to the CQI obtaining in base station corresponding to main transfer point comprises: MCS selection is carried out according to the CQI calculating in base station corresponding to main transfer point;
The step that CQI is recalculated in base station corresponding to main transfer point comprises: described base station obtains the channel matrix of multiple transfer points
Figure FDA0000432714420000021
interference and the system noise power sum outside the transfer point set of autonomous transmission point place calculated according to the channel matrix of the main transfer point of the CQI receiving and acquisition in described base station
Figure FDA0000432714420000022
described base station according to the channel matrix, pre-coding matrix of the multiple transfer points that obtain and
Figure FDA0000432714420000023
recalculate CQI.
9. method as claimed in claim 8, is characterized in that, described base station obtains the channel matrix of multiple transfer points
Figure FDA0000432714420000024
step comprise:
Described base station obtains channel matrix from multiple transfer points
Figure FDA0000432714420000025
or
Described base station obtains the channel matrix about multiple transfer points from UE
Figure FDA0000432714420000026
10. method as claimed in claim 9, is characterized in that, described base station obtains channel matrix from multiple transfer points
Figure FDA0000432714420000027
after, also comprise step: described base station according to the CQI receiving to the same transfer point of correspondence
Figure FDA0000432714420000028
adjust, obtain the channel matrix after adjusting
Figure FDA0000432714420000029
or
Described base station obtains channel matrix from multiple transfer points, is each transfer point according to the CQI receiving to the same transfer point of correspondence
Figure FDA00004327144200000210
channel matrix after adjusting
Figure FDA00004327144200000211
11. methods as claimed in claim 8, is characterized in that, interference and the system noise power sum outside the transfer point set of autonomous transmission point place calculated according to the CQI receiving and the channel matrix of acquisition in described base station
Figure FDA0000432714420000031
step comprise: described base station calculates according to the CQI receiving and the channel matrix of CQI increment and acquisition
Figure FDA0000432714420000032
12. methods as claimed in claim 8, is characterized in that, described base station according to the channel matrix, pre-coding matrix that obtain and
Figure FDA0000432714420000033
the step that recalculates CQI comprises: described base station according to the channel matrix, pre-coding matrix, linearity test matrix that obtain and recalculate CQI.
13. 1 kinds of user equipment (UE)s, is characterized in that, comprising:
Interface module, the reference signal sending for receiving multiple transfer points;
Constructing module, for for each transfer point, constructs channel matrix H according to the reference signal of this transfer point transmission ij, n;
Measurement module, for measuring from the interference outside described multiple transfer points and system noise power sum I n;
Computing module, for according to the channel matrix H of the main transfer point of multiple transfer points 0j, nand I ncalculate the channel quality indicator (CQI) of this main transfer point, and for the each cooperation transmission point except main transfer point in multiple transfer points, according to the H of main transfer point 0j, nh with this cooperation transmission point ij, ncalculate the channel quality indicator (CQI) of this cooperation transmission point, and indicate interface module that the CQI that calculates described multiple transfer points is at least sent to main transfer point.
14. UE as claimed in claim 13, is characterized in that, computing module is also for according to the H of main transfer point 0j, nand I ncalculate the CQI increment of this main transfer point, and indicate interface module that the CQI increment calculating is at least sent to main transfer point.
15. UE as claimed in claim 14, is characterized in that, CQI increment is the increment of CQI of the CQI while not considering that cooperation cell is disturbed while relatively considering that cooperation cell is disturbed.
16. UE as claimed in claim 14, is characterized in that, the feedback model and/or the feedback kind that adopt to main transfer point feedback of down channel information comprise CQI increment size.
17. UE as claimed in claim 16, is characterized in that, the feedback model of periodic feedback and feedback kind are supported CQI increment information feedback; The feedback model of non-periodic feedback is supported CQI increment information feedback.
18. UE as claimed in claim 14, is characterized in that, computing module is according to the H of main transfer point in multiple transfer points 0j, n, I nwith user's received power sum of cooperation transmission point in described multiple transfer points, calculate the channel quality indicator (CQI) of this main transfer point.
19. UE as claimed in claim 13, is characterized in that, the CQI of the each transfer point calculating is sent to respectively corresponding transfer point by interface module, and the cooperation transmission CQI receiving that names a person for a particular job is transmitted to main transfer point; Or, the CQI of all transfer points that calculate is directly sent to main transfer point.
20. 1 kinds of base stations, is characterized in that, comprising:
Interface module, the CQI sending for receiving user equipment (UE), this CQI is according to main transfer point H 0j, nand I ncalculate H 0j, naccording to the channel matrix of the reference signal structure of main transfer point transmission, I ncome interference and system noise power sum outside the place transfer point set of autonomous transfer point;
Control module, for carrying out MCS selection according to the CQI obtaining;
While described UE having been carried out to scheduling after control module is being received CQI, described base station also comprises: computing module, for recalculating CQI; Control module specifically for, carry out MCS selection according to the CQI calculating;
Interface module specifically for, obtain the channel matrix of multiple transfer points computing module specifically for, calculate interference and the system noise power sum outside the transfer point set of autonomous transmission point place according to the channel matrix of main transfer point in multiple transfer points of the CQI receiving and acquisition
Figure FDA0000432714420000042
according to the channel matrix, pre-coding matrix of the multiple transfer points that obtain and
Figure FDA0000432714420000043
recalculate CQI.
21. base stations as claimed in claim 20, is characterized in that, interface module obtains channel matrix from multiple transfer points or, obtain the channel matrix about multiple transfer points from UE
22. base stations as claimed in claim 21, is characterized in that, computing module also for according to the CQI that receives to the same transfer point of correspondence adjust, obtain the channel matrix after adjusting or
Interface module obtains channel matrix from multiple transfer points, is each transfer point according to the CQI receiving to the same transfer point of correspondence
Figure FDA0000432714420000051
channel matrix after adjusting
Figure FDA0000432714420000052
23. base stations as claimed in claim 20, is characterized in that, computing module calculates according to the CQI receiving and the channel matrix of CQI increment and acquisition
Figure FDA0000432714420000053
24. base stations as claimed in claim 20, is characterized in that, computing module according to the channel matrix, pre-coding matrix, linearity test matrix that obtain and
Figure FDA0000432714420000054
recalculate CQI.
25. 1 kinds of transfer point equipment, is characterized in that, comprising:
First interface module, the CQI sending for receiving user equipment (UE), this CQI is according to main transfer point H 0j, nand I ncalculate H 0j, naccording to the channel matrix of the reference signal structure of main transfer point transmission, I ncome interference and system noise power sum outside the place transfer point set of autonomous transfer point;
The second interface module, for the CQI receiving is transmitted to corresponding base station, makes base station carry out MCS selection according to the CQI obtaining;
Described the second interface module is also for obtaining the channel matrix about multiple transfer points
Figure FDA0000432714420000055
and the channel matrix of acquisition is sent to corresponding base station.
26. transfer point equipment as claimed in claim 25, is characterized in that, the second interface module obtains channel matrix from other transfer point and this locality
Figure FDA0000432714420000056
or
The second interface module obtains the channel matrix about multiple transfer points by first interface module from UE
Figure FDA0000432714420000057
27. transfer point equipment as claimed in claim 25, is characterized in that, also comprise: adjusting module, for according to the CQI that receives to the same transfer point of correspondence
Figure FDA0000432714420000058
adjust, obtain the channel matrix after adjusting
Figure FDA0000432714420000059
28. transfer point equipment as claimed in claim 26, is characterized in that, the second interface module obtains channel matrix from other transfer point, are each transfer points according to the CQI receiving to the same transfer point of correspondence
Figure FDA00004327144200000510
channel matrix after adjusting
Figure FDA00004327144200000511
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