CN101789813B - Feedback method of channel quality information and terminal - Google Patents

Abstract

The invention discloses a feedback method of channel quality information (CQI) and a terminal. In the method, the terminal feeds back CQI to the network side, wherein CQI comprises the wideband CQI index of the serving cell and the wideband differential CQI index offset level of each coordinating cell in a plurality of coordinating cells; and the wideband differential CQI index offset level of the coordinating cell is the wideband CQI index of the serving cell minus the wideband CQI index of the coordinating cell. The technical scheme provided by the invention solves the problem that the overhead is high when the terminal feeds back CQI during CoMP transmission in the related art, thus further reducing the feedback overhead of the terminal.

Description

Channel quality information feedback method and terminal

Technical field

The present invention relates to the communications field, specifically, relate to channel quality information (ChannelQuality Information, referred to as the CQI) feedback method in multipoint cooperative (CoordinationMultiPoint, referred to as CoMP) transmission technology and terminal.

Background technology

In order to provide higher throughput, solve the interference problem of minizone simultaneously, new generation of wireless communication system is considered to introduce cooperation multiple-input and multiple-output (the MultipleInput Multiple Output between network level, referred to as MIMO) technology, wherein, here new generation of wireless communication system can be senior Long Term Evolution (Long-Term Evolution Advance, referred to as LTE-Advance), senior international mobile telecommunication (International MobileTelecommunication Advance, referred to as IMT-Advance) etc.And in LTE-Advance, formal CoMP transmission technology to be studied as a kind of alternative technique.Because the antenna distance of Cell Edge User apart from multiple neighbor cell is more or less the same, therefore, utilize the transmitting antenna of multiple community to cooperate and realize higher capacity and the transmitting of cell edge place wireless link, the interference problem that the user that can eliminate cell edge place completely causes.

Above-mentioned coordinated multipoint transmission technical characterstic is:

(1) by multiple base station (Base Station, referred to as the BS) cooperation on identical Radio Resource, be a mobile terminal (Mobile Station, referred to as MS) service jointly.

(2) each BS can be that one or more MS serves on identical Radio Resource simultaneously.

At present, in CoMP, based on LTE R8, multiple viewpoint is proposed respectively.Wherein, based on the CoMP cooperation transmission method of antenna port 5 (antenna port 5), due to can compatible LTE version (Release, referred to as R) 8 users and being widely used.

In LTE R8, antenna port 5 Physical Uplink Shared Channel (Physical UplinkShare Channel, referred to as PUSCH) upper aperiodic channel quality instruction (ChannelQuality Indicator, referred to as CQI) the following two kinds of patterns of feedback support: Mode2-0, Mode 3-0, two kinds of pattern: Mode 1-0, Mode 2-0 below the periodic CQI feedback support of Physical Uplink Control Channel (Physical Uplink Control Channel, referred to as PUCCH).

Below respectively to CQI feedback Mode 2-0 aperiodic on above-mentioned PUSCH, being described below of Mode 3-0:

(1) Mode 2-0 is subscriber equipment (User Equipment, referred to as UE) subband (subband) that selects feedback, UE is select M reasonable subband N number of subband of k from size, and wherein, the value of k with M is relevant with descending system bandwidth.The number N of Subband by calculate, wherein, N _rB ^dLfor descending system bandwidth.The UE CQI that feedback one is average on M the subband selected, this CQI value reflects the CQI (indicating (Rank Indicator, referred to as RI) to have nothing to do with the order calculated or feed back) of all layers; UE reports broadband (wideband) CQI simultaneously; For the sending mode (that is, mode 3) of Open-Loop Spatial Multiplexing, UE is according to the RI reported, and feedback CQI, for other sending mode, situation about reporting is identical with the situation of RI=1.CQI feedback expense is:

4(wideband CQI)+2(subband differential CQI)+L(Positionof the M selected subband)bits

Particularly, 4 bits are for transmitting wideband CQI index, and 2 bits are for transmitting subband differential CQI index, and L bits is for transmitting Position of the Mselected subband.

(2) Mode 3-0 is the subband feedback of high-rise configuration, UE reports a wideband CQI, UE is that each subband reports subband CQI (suppose to transmit and carry out on the subband of high level configuration), the CQI of Wideband and subband represents the channel quality of first Codeword streams of code words, and the situation for RI > 1 is applicable equally; Subband differential CQI offset level=subband CQI index-wideband CQI index, CQI feedback expense is:

4(wideband CQI)+2N(subband differential CQI)bits

Particularly, 4 bits are for transmitting wideband CQI index, and 2N bits is for transmitting subband differential CQI index.

Respectively periodicity CQI feedback Mode 1-0, Mode2-0 on above-mentioned PUCCH are described below below:

(1) Mode 1-0 is the feedback of wideband, and for the sending mode of mode 3, in the subframe (subframe) that RI reports, UE determines that in subband S set RI, a UE report according to type 3, comprises a RI; Reporting the subframe of CQI, UE to report a wideband CQI, assuming that transmit in subband S set, for the transmission of mode 3, the RI that CQI periodically reported according to the last time calculates, and for other transmission mode, calculates CQI according to RI=1.CQI feedback expense is:

4 (wideband CQI) bits, that is, 4bits is for transmitting wideband CQI.

(2) Mode 2-0 is the feedback that UE selects subband, for the transmission of mode 3, determines that RI, a UE report according to type 3, comprise a RI at the subframe that RI reports, UE in subband S set; Report the subframe of CQI, UE reports according to type 4, according to reporting of the last time periodicity RI, feeds back a wideband CQI; Report subframe at selection subband CQI, UE is at each N of J bandwidth fragmentation _jthe reasonable subband of subband Resource selection, the subband that UE is selecting reports a CQI according to type 1, comprise the mark of L bit, chance is reported at respective continuous print, each bandwidth fragmentation perform the reporting of type1 successively, CQI represents the channel quality on all layers, does not consider RI here; For the transmission of mode 3, the selection of relatively good subband and the calculating of CQI, depend on the RI that the last time reports, for other transmission mode, and RI=1.CQI feedback expense is:

4(wideband CQI)bits

4 (subband CQI)+1 or 2 (subband label)

Particularly, 4bits is for transmitting wideband CQI index, 1bit or 2bits is for transmitting subband label.

In collaborative multiple spot CoMP, if terminal is according to existing feedback system, for mode 3-0 aperiodic, feedback overhead is:

$4*B+2*(N_{S_{\mathrm{cell}}}+N_{C_{\mathrm{cell},1}}+\·\·\·\·\·\·+N_{C_{\mathrm{cell},(M-1)}})\mathrm{bits}$

Wherein, B is the community number (comprising Serving cell) of cooperative transmission, for the subband subband number of Serving cell, for the subband number of each cooperation cell.As can be seen from the above equation, along with the increase of cooperation cell number, feedback overhead linear growth.

As can be seen from foregoing description, in CoMP transmission, expense when terminal carries out CQI feedback is larger.

Summary of the invention

For in correlation technique during CoMP transmission, the problem that expense when terminal carries out CQI feedback is larger and propose the present invention, for this reason, main purpose of the present invention is the CQI feedback scheme providing improvement, to solve the problem one of at least.

According to an aspect provided by the invention, provide a kind of channel quality information feedback method.

Channel quality information feedback method according to the present invention comprises: terminal is to network side feeds back CQI information, wherein, CQI information comprises: the broadband CQI index difference offset level of each cooperation cell in the broadband CQI index of Serving cell and multiple cooperation cell, wherein, the broadband CQI index difference offset level of cooperation cell is the broadband CQI index that the broadband CQI index of Serving cell deducts this cooperation cell.

According to another aspect provided by the invention, additionally provide a kind of channel quality information feedback method.

Channel quality information feedback method according to the present invention comprises: terminal is to network side feeds back CQI information, wherein, CQI information comprises: each subband CQI index difference offset level of the CQI index difference offset level on each subband of Serving cell and each cooperation cell in multiple cooperation cell, wherein, the subband CQI index difference offset level of Serving cell is the broadband CQI index that each subband CQI index of Serving cell deducts Serving cell, the subband CQI index difference offset level of cooperation cell is the broadband CQI index that this subband CQI index of this cooperation cell deducts Serving cell.

According to another aspect provided by the invention, additionally provide a kind of channel quality information feedback method.

Channel quality information feedback method according to the present invention comprises: terminal is to network side feeds back CQI information, wherein, CQI information comprises: the broadband CQI index of Serving cell, the broadband CQI index difference offset level of each cooperation cell in multiple cooperation cell, the average CQI index difference offset level of multiple subbands in the Serving cell that terminal is selected and multiple cooperation cell, wherein, the broadband CQI index difference offset level of cooperation cell is the broadband CQI index that the broadband CQI index of Serving cell deducts this cooperation cell, the average CQI index difference offset level of multiple subband is the broadband CQI index that the average CQI index of multiple subband deducts Serving cell.

According to another aspect provided by the invention, additionally provide a kind of channel quality information feedback terminal.

Channel quality information feedback terminal according to the present invention comprises: receiver module, determination module, feedback module and calling module.Wherein, receiver module is for receiving the Downlink Control Information from network side, and wherein, Downlink Control Information is used to indicate the feedback system that terminal carries out ground CQI feedback aperiodic; The Downlink Control Information determination terminal that determination module is used for receiving according to receiver module carries out the feedback system of CQI feedback; Feedback module is used for the feedback system determined according to determination module, and to network side feeds back CQI information, wherein, CQI information comprises: broadband CQI index and/or subband CQI index, broadband CQI index difference offset level and/or subband CQI index difference offset level; Calling module, for the feedback system determined according to determination module, calls feedback module and feeds back.

Pass through the present invention, adopt when terminal carries out CQI feedback, feedback information comprises the method for the CQI index difference offset level redefined, when solving CoMP transmission in correlation technique, the problem that expense when terminal carries out CQI feedback is larger, and then reduce the feedback overhead of terminal.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the schematic diagram of wideband CQI feedback in the CoMP according to the embodiment of the present invention;

Fig. 2 is the schematic diagram of cooperation cell subband CQI index differential relationship in the CoMP according to the embodiment of the present invention;

Fig. 3 is the schematic diagram of subband CQI feedback in the CoMP according to the embodiment of the present invention;

Fig. 4 is the structured flowchart of the terminal according to the embodiment of the present invention.

Embodiment

Functional overview

When considering CoMP transmission in the technology of pass, the problem that expense when terminal carries out CQI feedback is larger, embodiments provide the CQI feedback scheme of improvement, when terminal carries out CQI feedback, feedback information comprises the CQI index difference offset level redefined, below by respectively for carrying out wideband CQI feedback according to the instruction of network side, carry out subband CQI feedback according to the instruction of described network side, terminal selects subband CQI to carry out feedback three kinds of feedback systems to be described in detail.

It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.

In CoMP, the pilot tone participating in each community of cooperation is orthogonal design, Serving cell can the cell ID (Cell ID) of each cooperation cell of notification terminal, terminal can be measured thus and obtain the channel information of each cooperation cell to terminal, now, LTE-A terminal can obtain the wideband CQI of each cooperation cell and the CQI information of each cooperation cell subband respectively, suppose there is B community and carry out cooperation transmission (B comprises Serving cell), the subband number of Serving cell is each cooperation cell subband number is respectively

Embodiment of the method

Embodiment one

According to embodiments of the invention, provide a kind of CQI feedback method, be applied to terminal and carry out wideband CQI feedback, wherein, cooperation transmission is carried out in Serving cell and multiple cooperation cell of terminal, the method comprises: terminal is to network side feeds back CQI information, wherein, CQI information comprises: the wideband CQI index difference offset level of each cooperation cell in the wideband CQI index of Serving cell and multiple cooperation cell, wherein, the wideband CQI index difference offset level of cooperation cell is the wideband CQI index that the wideband CQI index of Serving cell deducts this cooperation cell.

Adopt this embodiment, the expense that the wideband CQI index difference offset level of each cooperation cell uses is 3bits.

Particularly, the wideband CQI index of each cooperation cell is carried out differential feedback, the offset table of differential feedback can continue to use the situation of two the CW transmission in single community, S _cellrepresent Serving cell, C _cellrepresent cooperation cell, in CoMP, wideband CQI differentialoffset level (differential offset grade) is defined as:

B C _cellwideband CQI offset level=S _cellwideband CQI index-b C _cellwideband CQI index

Wideband CQI differential offset level in CoMP does difference respectively with the wideband CQI index of Serving cell and the wideband CQI index of each cooperation cell, the wideband CQI index of terminal feedback Serving cell and each cooperation cell wideband CQI index difference offset level, wideband CQI feedback expense is:

4(S _cellwideband CQI)+3*(B-1)

Wherein, 3* (B-1) is C _cellwideband CQI feedback expense, wideband differential offset table of grading can continue to use existing wideband differential offset table of grading, also can redefine.

Fig. 1 is the schematic diagram of wideband CQI feedback in the CoMP according to the embodiment of the present invention, as shown in Figure 1, Serving cell wideband CQI takies 4bit, each cooperation cell wideband differential CQI takies 3bit, wherein, cooperation cell comprises: cooperation cell 1,2...... cooperation cell, cooperation cell (B-1).

By this embodiment, in CoMP during wideband CQI feedback, reduce the feedback overhead of terminal.

Embodiment two

According to embodiments of the invention, provide a kind of CQI feedback method, be applied to high-rise configuration subband CQI feedback, wherein, cooperation transmission is carried out in Serving cell and multiple cooperation cell of terminal, the method comprises: terminal is to network side feeds back CQI information, wherein, CQI information comprises: each subband CQI index difference offset level of the CQI index difference offset level on each subband of Serving cell and each cooperation cell in multiple cooperation cell, wherein, the subband CQI index difference offset level of Serving cell is the wideband CQI index that this subband CQI index of Serving cell deducts Serving cell, the subband CQI index difference offset level of cooperation cell is the wideband CQI index that this subband CQI index of this cooperation cell deducts Serving cell.The expense that each subband CQI index difference offset level of each cooperation cell here uses is 2bits.

Fig. 2 is the schematic diagram of cooperation cell subband CQI index differential relationship in the CoMP according to the embodiment of the present invention, as shown in Figure 2, for 2 cooperation cell, carry out difference to each cooperation cell subband CQI index and Serving cell wideband CQI index, cooperation cell subband differential offset level is defined as:

B C _celln-th _jindividual subband offset level=b C _celln-th _jindividual subband CQI index-S _cellwideband CQI index

Wherein, $1\≤n_j\≤N_{C_{\mathrm{cell},b}},$ be b cooperation cell subband number.In CoMP, the physical relationship of subband difference offset level is: the CQI index on each subband in cooperation cell and Serving cell wideband CQI index carry out difference,

Now, the differential offset grade of the CQI index on each subband in terminal feedback Serving cell and each cooperation cell each subband CQI index and Serving cell wideband CQI index, the expense when subband of high-rise configuration feeds back is:

$2*N_{S_{\mathrm{cell}}}+2*N_{C_{\mathrm{cell},1}}+2*N_{C_{\mathrm{cell},2}}+\·\·\·\·\·\·+2*N_{C_{\mathrm{cell},(B-1)}}\mathrm{bits}$

In above-mentioned formula, CoMP transmission is carried out in B community, wherein, it is Serving cell the CQI feedback of individual subband, $2*N_{C_{\mathrm{cell},1}}+2*N_{C_{\mathrm{cell},2}}+\·\·\·\·\·\·+2*N_{C_{\mathrm{cell},(B-1)}}$ It is the differential CQI offset level that each cooperation cell each subband CQI index deducts Serving cell wideband CQI index.Subband differential CQI offset level table can adopt existing Subband differential CQI offset level table, also can redefine.

Fig. 3 is the schematic diagram of subband CQI feedback in the CoMP according to the embodiment of the present invention, and as shown in Figure 3, Serving cell subband CQI takies cooperation cell 1 subband differential CQI takies (2*N _{cell, 1}bits), cooperation cell 2 subband differential CQI takies (2*N _{cell, 2}bits) ... cooperation cell (B-1) subband differential CQI takies (2*N _{cell, (B-1)}bits).

Further, CQI information can also comprise: the wideband CQI index difference offset level of each cooperation cell in the wideband CQI index of Serving cell and multiple cooperation cell, wherein, the wideband CQI index difference offset level of cooperation cell is the wideband CQI index that the wideband CQI index of Serving cell deducts this cooperation cell.The expense that the wideband CQI index difference offset level of each cooperation cell here uses is 3bits.

When the subband feedback of this high level configuration, the feedback overhead of LTE-A terminal wideband and subband is:

$4+2*N_{S_{\mathrm{cell}}}+2*N_{C_{\mathrm{cell},1}}+2*N_{C_{\mathrm{cell},2}}+\·\·\·\·\·\·+2*N_{C_{\mathrm{cell},(B-1)}}+3*(B-1)\mathrm{bits}$

By this embodiment, in CoMP during subband CQI feedback, reduce the feedback overhead of terminal.

Embodiment three

According to embodiments of the invention, provide a kind of CQI feedback method, be applied to terminal and select subband CQI feedback, wherein, cooperation transmission is carried out in Serving cell and multiple cooperation cell of terminal, the method comprises: terminal is to network side feeds back CQI information, wherein, CQI information comprises: the wideband CQI index of Serving cell, the wideband CQI index difference offset level of each cooperation cell in multiple cooperation cell, the average CQI index difference offset level of multiple more excellent subband in the Serving cell that terminal is selected and multiple cooperation cell, wherein, the wideband CQI index difference offset level of cooperation cell is the wideband CQI index that the wideband CQI index of Serving cell deducts this cooperation cell, the average CQI index difference offset level of multiple more excellent subband is the wideband CQI index that the average CQI index of multiple more excellent subband deducts Serving cell, the expense that the wideband CQI index difference offset level of each cooperation cell here uses is 3bits.

Particularly, when terminal selects subband to feed back, in the Serving cell that terminal is selected the CQI of individual better subband, in each cooperation cell the CQI of individual better subband, expense is indicated in order to effectively reduce terminal feedback subband, the subband that terminal can select CQI value close in multiple preferably sets of subbands feeds back, substantially suitable with R8 terminal feedback expense in order to ensure, regulation selects at most M preferably subband, indicates the position of subband with Lbit.CQI offset level average on M subband is defined as:

M the average CQI index-S of more excellent subband of M more excellent subband average CQI offsetlevel=B the community selection of B cooperation with service community selection _cellwideband CQI index

Now, terminal feedback Serving cell wideband CQI index (4bits) and each cooperation wideband CQI differential offset grade (3bits), report the CQI differential offset grade (2bits) that the M of multiple cooperation transmission communities comprehensive selection more excellent subband is average simultaneously.Feedback overhead is as follows:

4+3*(B-1)+L+2 bits

Wherein, L is preferably M subband position instruction.

By this embodiment, when terminal selects subband to feed back in CoMP, reduce the feedback overhead of terminal.

Be described in detail below in conjunction with the implementation procedure of example to the embodiment of the present invention, this example comprises the steps:

The first step, each community ID of Serving cell notice LTE-A terminal cooperative transmission, terminal carries out channel measurement.LTE-A terminal measures each cooperation cell to terminal wideband CQI and subband CQI according to the public guide frequency of each cooperation cell; LTE-A terminal according to high level (namely, RRC) CQI feedback is carried out in configuration, if RRC configurating terminal is wideband CQI feedback, then proceed to second step, if RRC configurating terminal is high-rise configuration subband CQI feedback, then proceed to the 3rd step, if RRC is configured to terminal select subband feedback, then proceed to the 4th step.

Second step, when RRC configurating terminal is wideband CQI feedback, proceeds as follows:

The wideband CQI index of terminal feedback Serving cell and each cooperation cell wideband CQI index difference offset level, the wideband CQI index difference offset level of cooperation cell is defined as:

B C _cellwideband CQI offset level=S _cellwideband CQI index-b C _cellwideband CQI index

Wideband CQI differential offset level is the wideband CQI index deducting each cooperation cell with the widebandCQI index of Serving cell, and feedback overhead is:

4(S _cellwideband CQI)+3*(B-1)

3rd step, when terminal is high-rise configuration subband CQI feedback, proceeds as follows:

The same prior art of Serving cell subband differential offset tier definition.Cooperation cell subband differential offset grade is defined as:

B C _celln-th _jindividual subband offset level=b C _celln-th _jindividual subband CQI index-S _cellwideband CQI index

Concrete difference is: the CQI index on each subband in cooperation cell deducts Serving cell wideband CQI index, $1\≤n_j\≤N_{C_{\mathrm{cell},b}}$ Be n-th of b cooperation cell _jindividual subband.Now, the differential offset grade of the CQI index offset grade on each subband in terminal feedback Serving cell and each cooperation cell each subband CQI index and Serving cell wideband CQI index.Subband CQI feedback expense is:

$2*N_{S_{\mathrm{cell}}}+2*N_{C_{\mathrm{cell},1}}+2*N_{C_{\mathrm{cell},2}}+\·\·\·\·\·\·+2*N_{C_{\mathrm{cell},(B-1)}}\mathrm{bits}$

The feedback overhead of LTE-A terminal wideband and subband CQI is:

$4+2*N_{S_{\mathrm{cell}}}+2*N_{C_{\mathrm{cell},1}}+2*N_{C_{\mathrm{cell},2}}+\·\·\·\·\·\·+2*N_{C_{\mathrm{cell},(B-1)}}+3*(B-1)\mathrm{bits}$

4th step, when RRC is configured to terminal selection subband feedback, proceeds as follows:

When terminal selects subband to feed back, Serving cell is selected the CQI of individual better subband, each cooperation cell is selected respectively the CQI of individual better subband, expense is indicated in order to effectively reduce terminal feedback subband, the subband that terminal can select CQI value close in multiple preferably sets of subbands feeds back, substantially suitable with R8 terminal feedback expense in order to ensure, regulation selects at most M preferably subband, indicates the position of subband with L bit.CQI offset level average on M subband is defined as:

M the average CQI index-S of more excellent subband of M more excellent subband average CQI offsetlevel=B the community selection of B cooperation with service community selection _cellwideband CQI index

Now, terminal feedback Serving cell wideband CQI index (4bits) and each cooperation wideband CQI differential offset grade (3bits), report the CQI differential offset grade (2bits) that the M of multiple cooperation transmission communities comprehensive selection more excellent subband is average simultaneously.Feedback overhead is as follows:

4+3*(B-1)+L+2 bits

Wherein, L is preferably M subband position instruction.

5th step, LTE-A terminal can according to the configuration of RRC, select flexibly step 2, three, three kinds of feedback systems of four feed back.

In CoMP, LTE-A terminal is to Serving cell feeds back CQI information, or to the community feeds back CQI information of multiple cooperative transmission, here CQI information comprises Serving cell to the wideband CQI of terminal and subband CQI, and each cooperation cell is to the wideband CQI of terminal and subband CQI information, the feedback system of four kinds of CQI information is as above-mentioned step 2, step 3, step 4.

Below above-mentioned implementation process is described in conjunction with instantiation.

Example one

With high-rise configurating terminal for subband is fed back to example, the feedback overhead of LTE-A terminal is:

$4+2*N_{S_{\mathrm{cell}}}+2*N_{C_{\mathrm{cell},1}}+2*N_{C_{\mathrm{cell},2}}+\·\·\·\·\·\·+2*N_{C_{\mathrm{cell},(M-1)}}+3*(B-1)\mathrm{bits}$

When CoMP transmission is carried out in Liang Ge community, and each community subband number is equal, i.e. B=2, $N_{S_{\mathrm{cell}}}=N_{C_{\mathrm{cell}}},$ Assuming that $N_{\mathrm{RB}}^{\mathrm{DL}}=26$ Time, $N_{S_{\mathrm{cell}}}=N_{C_{\mathrm{cell}}}=7,$ Adopt the existing feedback method of R8 terminal, expense is 4*2+2*14=36bits, and adopt the method that the embodiment of the present invention provides, expense is: 4+2*7+2*7+3=35bits, and therefore, feedback overhead reduces 1bits.

Example two

When three cell cooperative transmission, system bandwidth is constant, B=3, $N_{S_{\mathrm{cell}}}=N_{C_{\mathrm{cell},1}}=N_{C_{\mathrm{cell},2}}=7,$ Adopt the feedback overhead of existing feedback method to be 4*3+2*7*3=54bits, adopt the feedback method that the embodiment of the present invention provides, expense is 4+2*7+2*7+2*7+3*2=52bits, and therefore, feedback overhead decreases 2bits.

By above-mentioned example, reduce the feedback overhead of terminal, improve the flexibility of CoMP scheduling.

Device embodiment

According to embodiments of the invention, provide a kind of terminal.Fig. 4 is the structured flowchart of the terminal according to the embodiment of the present invention, and as shown in Figure 4, this terminal comprises: receiver module 42, determination module 44, feedback module 46, calling module 48, be described in detail said structure below.

Receiver module 42, for receiving the Downlink Control Information from network side, wherein, Downlink Control Information is used to indicate the feedback system of terminal CQI feedback; Determination module 44, be connected to receiver module 42, Downlink Control Information determination terminal for receiving according to receiver module 42 carries out the feedback system of CQI feedback, and wherein, feedback system comprises: broadband CQI feedback, high-rise configuration subband CQI feedback, terminal select subband CQI feedback; Feedback module 46, for the feedback system determined according to determination module, to network side feeds back CQI information, wherein, CQI information comprises: broadband CQI index and/or subband CQI index, broadband CQI index difference offset level and/or subband CQI index difference offset level; Calling module 48, is connected to determination module 44 and feedback module 46, for the feedback system determined according to determination module 44, calls feedback module 46 and feeds back.

Particularly, above-mentioned feedback system comprises three kinds of situations, will be described in detail below to these three kinds of situations.

(1) if feedback system is broadband CQI feedback, then CQI information comprises: the broadband CQI index difference offset level of each cooperation cell in the broadband CQI index of Serving cell and multiple cooperation cell, wherein, the broadband CQI index difference offset level of cooperation cell is the broadband CQI index that the broadband CQI index of Serving cell deducts this cooperation cell.

(2) if feedback system is high-rise configuration subband CQI feedback, then CQI information comprises: each subband CQI index difference offset level of the CQI index offset grade on each subband of Serving cell and each cooperation cell in multiple cooperation cell, wherein, the subband CQI index difference offset level of cooperation cell is the broadband CQI index that this subband CQI index of this cooperation cell deducts Serving cell.

Further, CQI information can also comprise: the broadband CQI index difference offset level of each cooperation cell in the broadband CQI index of Serving cell and multiple cooperation cell, wherein, the broadband CQI index difference offset level of cooperation cell is the broadband CQI index that the broadband CQI index of Serving cell deducts this cooperation cell.

(3) if feedback system is terminal select subband CQI feedback, then CQI information comprises: the broadband CQI index of Serving cell, the broadband CQI index difference offset level of each cooperation cell in multiple cooperation cell, the average CQI index difference offset level of multiple more excellent subband in the Serving cell that terminal is selected and multiple cooperation cell, wherein, the broadband CQI index difference offset level of cooperation cell is the broadband CQI index that the broadband CQI index of Serving cell deducts this cooperation cell, the average CQI index difference offset level of multiple more excellent subband is the broadband CQI index that the average CQI index of multiple more excellent subband deducts Serving cell.

By this embodiment, provide the terminal that the CQI information fed back to network side comprises broadband CQI index and/or subband CQI index, broadband CQI index difference offset level and/or subband CQI index difference offset level, the feedback overhead of terminal can be reduced.

In sum, by the above embodiments of the present invention, the feedback overhead of terminal CQI during collaborative multicast communication effectively can be reduced; Differential feedback is carried out for wideband CQI, the expense of wideband CQI feedback can be reduced, and along with the reduction of the increase feedback overhead of cooperation cell number more obvious; When selecting subband feedback for terminal, can when feedback overhead be suitable, for user distributes better resource.Network side is according to the multi-cell channel information of terminal feedback, scheduling of resource flexibly can be realized, namely, terminal contains the channel information on each cooperation cell wideband CQI index and each subband and optimum subband to the CQI information that Serving cell is fed back, network side can comprehensive these channel informations, carry out Resourse Distribute flexibly.

Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (13)

1. a channel quality information CQI feedback method, is applied to terminal and carries out broadband CQI feedback, and wherein, cooperation transmission is carried out in Serving cell and multiple cooperation cell of described terminal, and it is characterized in that, described method comprises:

Described terminal is to network side feeds back CQI information, and wherein, described CQI information comprises: the broadband CQI index difference offset level of each cooperation cell in the broadband CQI index of described Serving cell and described multiple cooperation cell,

Wherein, the broadband CQI index difference offset level of cooperation cell is the broadband CQI index that the broadband CQI index of described Serving cell deducts this cooperation cell.

2. method according to claim 1, is characterized in that, the expense that the broadband CQI index difference offset level of described each cooperation cell uses is 3 bits.

3. a channel quality information CQI feedback method, be applied to high-rise configuration subband CQI feedback, wherein, cooperation transmission is carried out in Serving cell and multiple cooperation cell of terminal, and it is characterized in that, described method comprises:

Described terminal is to network side feeds back CQI information, and wherein, described CQI information comprises: each subband CQI index difference offset level of the CQI index difference offset level on each subband of described Serving cell and each cooperation cell in described multiple cooperation cell,

Wherein, the subband CQI index difference offset level of Serving cell is the broadband CQI index that each subband CQI index of Serving cell deducts Serving cell, and the subband CQI index difference offset level of cooperation cell is the broadband CQI index that this subband CQI index of this cooperation cell deducts described Serving cell.

4. method according to claim 3, is characterized in that, the expense that each subband CQI index difference offset level of described each cooperation cell uses is 2 bits.

5. method according to claim 3, is characterized in that, described CQI information also comprises:

The broadband CQI index difference offset level of each cooperation cell in the broadband CQI index of described Serving cell and described multiple cooperation cell, wherein, the broadband CQI index difference offset level of described cooperation cell is the broadband CQI index that the broadband CQI index of described Serving cell deducts this cooperation cell.

6. method according to claim 5, is characterized in that, the expense that the broadband CQI index difference offset level of described each cooperation cell uses is 3 bits.

7. a channel quality information CQI feedback method, be applied to terminal and select subband CQI feedback, wherein, cooperation transmission is carried out in Serving cell and multiple cooperation cell of described terminal, and it is characterized in that, described method comprises:

Described terminal is to network side feeds back CQI information, wherein, described CQI information comprises: the average CQI index difference offset level of multiple subbands in the described Serving cell that the broadband CQI index difference offset level of each cooperation cell in the broadband CQI index of described Serving cell, described multiple cooperation cell, described terminal are selected and described multiple cooperation cell

Wherein, the broadband CQI index difference offset level of described cooperation cell is the broadband CQI index that the broadband CQI index of described Serving cell deducts this cooperation cell, and the average CQI index difference offset level of described multiple subband is the broadband CQI index that the average CQI index of described multiple subband deducts described Serving cell.

8. method according to claim 7, is characterized in that, the expense that the broadband CQI index difference offset level of described each cooperation cell uses is 3 bits.

9. a terminal, is characterized in that, comprising:

Receiver module, for receiving the Downlink Control Information from network side, wherein, described Downlink Control Information is used to indicate the feedback system that terminal carries out aperiodic CQI feedback;

Determination module, the described Downlink Control Information for receiving according to described receiver module determines that described terminal carries out the feedback system of CQI feedback;

Feedback module, for the feedback system determined according to described determination module, to described network side feeds back CQI information, wherein, described CQI information comprises: broadband CQI index and/or subband CQI index, broadband CQI index difference offset level and/or subband CQI index difference offset level;

Calling module, for the described feedback system determined according to described determination module, calls described feedback module and feeds back.

10. terminal according to claim 9, is characterized in that, described feedback system is broadband CQI feedback; Described CQI information comprises: the broadband CQI index difference offset level of each cooperation cell in the broadband CQI index of Serving cell and multiple cooperation cell, wherein, the broadband CQI index difference offset level of described cooperation cell is the broadband CQI index that the broadband CQI index of described Serving cell deducts this cooperation cell.

11. terminals according to claim 9, is characterized in that, described feedback system is high-rise configuration subband CQI feedback; Described CQI information comprises: each subband CQI index difference offset level of the CQI index offset grade on each subband of Serving cell and each cooperation cell in multiple cooperation cell, wherein, the subband CQI index difference offset level of described cooperation cell is the broadband CQI index that this subband CQI index of this cooperation cell deducts described Serving cell.

12. terminals according to claim 11, it is characterized in that, described CQI information also comprises: the broadband CQI index difference offset level of each cooperation cell in the broadband CQI index of described Serving cell and described multiple cooperation cell, wherein, the broadband CQI index difference offset level of described cooperation cell is the broadband CQI index that the broadband CQI index of described Serving cell deducts this cooperation cell.

13. terminals according to claim 9, is characterized in that, described feedback system is that terminal selects subband CQI feedback, described CQI information comprises: the broadband CQI index of Serving cell, the broadband CQI index difference offset level of each cooperation cell in multiple cooperation cell, the average CQI index difference offset level of the multiple subbands in the described Serving cell that described terminal is selected and described multiple cooperation cell, wherein, the broadband CQI index difference offset level of described cooperation cell is the broadband CQI index that the broadband CQI index of described Serving cell deducts this cooperation cell, the average CQI index difference offset level of described multiple subband is the broadband CQI index that the average CQI index of described multiple subband deducts described Serving cell.