CN102325013A

CN102325013A - Channel state information transmission method and device

Info

Publication number: CN102325013A
Application number: CN201110202554A
Authority: CN
Inventors: 高雪娟; 沈祖康; 林亚男
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2011-07-19
Filing date: 2011-07-19
Publication date: 2012-01-18
Anticipated expiration: 2031-07-19
Also published as: WO2013010439A1; CN102325013B

Abstract

The embodiment of the invention discloses a channel state information transmission method and device and relates to the technical field of radio communication, and the method and device provided by the invention are used for solving the problem of how to simultaneously transmit CSI (Channel State Information) of a plurality of downlink carriers. The method comprises: determining the downlink carriers needing CSI compression in the plurality of downlink carriers needing to feed back the CSI in a current uplink sub-frame by a terminal; compressing the CSI of the downlink carriers which need the CSI compression; and feeding back the compressed CSI corresponding to the downlink carriers needing the CSI compression, and the CSI corresponding to the downlink carriers, except for the downlink carriers needing the CSI compression, in the plurality of downlink carriers needing to feed back the CSI in the current uplink sub-frame, to a base station in the current uplink sub-frame. The method and the device can be used for realizing the scheme of simultaneously transmitting the CSI of the plurality of downlink carriers in a same uplink sub-frame, so that the base station can simultaneously obtain the CSI of the plurality of downlink carriers to improve the accuracy of downlink scheduling.

Description

Channel condition information transmission method and equipment

Technical field

The present invention relates to wireless communication field, relate in particular to a kind of channel condition information transmission method and equipment.

Background technology

For long-term evolution upgrading (Long Term Evolution Advanced; LTE-A) system is for supporting than Long Term Evolution (Long Term Evolution, LTE) the wideer system bandwidth of system; Can be with distributing to some spectrum aggregatings of existing systems; Gather into big bandwidth and supply with long-term evolution multi-carrier system use, i.e. carrier aggregation (Carrier Aggregation, CA) technology.The up-downgoing carrier wave can asymmetricly dispose in this moment system, and promptly the user may take N1 >=1 carrier wave and carries out downlink transfer, and N2 >=1 carrier wave carries out uplink, and is as shown in Figure 1.

In LTE-A version 10 (Rel-10) the CA system; In order effectively to carry out carrier dispatching and link circuit self-adapting process; The base station need obtain user terminal (User Equipment; (Channel State Information CSI), carries out multi-carrier scheduling with this to the channel condition information of a plurality of descending carriers of UE) measuring.CSI can comprise order indication (Rank Indicator; RI) information, channel quality indication (Channel Quality Indicator; CQI) information and pre-coding matrix indication (Precoding Matrix Indicator; PMI) information, wherein CQI information is divided into broadband CQI (Wide-band CQI) information and subband CQI (Sub-band CQI) information again.UE can report pattern (Reporting Mode) to go up the periodic CSI information of sending at Physical Uplink Control Channel (PUCCH) according to following four kinds:

First kind, Mode 1-0 (being that broadband CQI reports pattern, no PMI):

Type (Type) 3 reports that report in the subframe (only effective): UE to report to comprise a RI at RI for transmission mode 3;

Report in the subframe at CQI: UE need report Type 4 report that comprises a broadband CQI, though RI whether greater than 1, this CQI only comprises the CQI of code word 0; For transmission mode 3, CQI calculates based on the RI that reports at last, for other transmission modes, calculates based on RI=1.

Second kind, Mode 1-1 (being that CQI+ single PMI in broadband reports pattern):

Type 3 reports that report in the subframe (only effective): UE to report to comprise a RI at RI to transmission mode 4,8,9;

Report in the subframe at RI and a PMI (first PMI) (only to transmission mode 9 subpattern 1 (submode 1) down and disposed under 8CSI-RS (channel condition information-pilot signal) port case effectively): UE reports Type 5 reports that comprise a RI and PMI joint instructions;

Report in the subframe at CQI and PMI: UE chooses a PMI from codebook subset, and confirms that a broadband CQI, this CQI are that hypothesis all uses the single PMI of above-mentioned selection to calculate in all subbands; When RI＞1, this CQI also comprises space, the broadband differential CQI value of one 3 bit, promptly representes the difference value of CQI of CQI and the numeral 0 of code word 1; For transmission mode 4,8 and 9; The CQI value is to calculate based on the RI that reports at last, for other transmission modes, to calculate based on RI=1; UE reports Type 2/2b/2c report according to following situation:

For transmission mode 4 and 8: report the Type2 report that comprises an above-mentioned broadband CQI and the 2nd PMI who selects (second PMI);

For the transmission mode that is configured in submode1 9: report the Type2b report that comprises an above-mentioned broadband CQI and the 2nd PMI who selects;

For the transmission mode that is configured in submode2 9: report the Type2c report of first and second PMI that comprise above-mentioned broadband CQI and confirm according to the above-mentioned single PMI that selects.

The third, Mode 2-0 (being that subband CQI reports pattern, no PMI):

Type 3 reports that report in the subframe (only effective): UE to report to comprise a RI at RI for transmission mode 3;

Report in the subframe at CQI: UE need report Type 4 report that comprises a broadband CQI, though RI whether greater than 1, this CQI only comprises the CQI of code word 0; For transmission mode 3, this CQI calculates based on the RI that reports at last, for other transmission modes, calculates based on RI=1;

CQI at selected subband reports in the subframe: UE should include N in every J portions of bandwidth _jSelect a first-selected subband in the subband set of subband; Report comprise one should the first-selection subband CQI and Type 1 report of L bit flag that should the first-selection subband; This CQI value only is reflected in the transmission on the selected subband in the portions of bandwidth that determines in the step; Type 1 report of each portions of bandwidth will each continuous report opportunity successively repeating query report, though RI whether greater than 1, this CQI only comprises the CQI of code word 0; For transmission mode 3, the selection of first-selected subband and the CQI of this subband calculate based on last RI that reports, and for other transmission mode, calculate based on RI=1.

The 4th kind, Mode 2-1 (being that subband CQI+PMI reports pattern):

Report in the subframe (, then only effective): UE need report Type 3 reports that comprise a RI for transmission mode 4,8 and 9 if the port number of CSI-RS is configured to 2 or 4 at RI;

RI in the transmission mode 9 that has disposed 8 port CSI-RS reports in the subframe: UE reports Type 6 reports that comprise a RI value and a precoding type indication (PTI, precoder type indication) value;

CQI and PMI report in the subframe in the broadband: UE chooses a PMI value from codebook subset; And:

Need report a Type 2 reports to the transmission mode except transmission mode 9: UE; Comprise: a broadband CQI value; This CQI is that hypothesis all uses the above-mentioned single PMI that chooses to calculate in all subbands, and a PMI who selects (wideband PMI) value; When RI＞1, also comprise space, the broadband differential CQI value of one 3 bit;

To transmission mode 9: when PTI=0, UE need report the Type2a report of a PMI value that comprises a selection; When PTI=1 or CSI-RS port are 2 or 4; UE need report a Type2b report; Comprise: a broadband CQI value, this CQI is that hypothesis all uses the above-mentioned single PMI that chooses to calculate in all subbands, and the 2nd PMI value of a selection; When RI＞1, also comprise space, the broadband differential CQI value of one 3 bit;

For transmission mode 4,8 and 9, the CQI value is to be that condition is calculated with the last RI that reports, and for other transmission modes, is that condition is calculated with RI=1;

CQI at selected subband reports in the subframe: UE should include N in every J portions of bandwidth _jSelect a first-selected subband in the subband set of subband;

Transmission mode except the transmission mode 9 that has disposed 8 port CSI-RS: UE is Type1 report of each portions of bandwidth transmission opportunity each self-contained continuous reporting; Comprise: the CQI value of code word 0 in this first-selection subband; And the L bit flag of first-selected subband, the transmission on the subband that this CQI value is only selected in the portions of bandwidth of the last step decision of reaction is when RI＞1; Comprise that also extra 3 bits represent the subband space differential CQI value of code word 1 with respect to the CQI offset level of code word 0; Wherein, code word 1 offset level=code word 0 subband CQI sequence number-code word 1 subband CQI sequence number, and suppose to use in all subbands the single PMI that reports recently to calculate;

To having disposed the transmission mode 9 of 8 port CSI-RS: when PTI=0; UE needs to report chance to report a Type2b report continuously at each, comprising: a broadband CQI value, and this CQI is that hypothesis all uses single PIM to calculate in all subbands; And the 2nd PMI value of selecting from codebook subset; When RI＞1, also comprise one 3 bit width carrying space differential CQI value, its differential mode is the same;

To transmission mode 9: when PTI=1; UE self-contained continuously reports send a Type1a report for each portions of bandwidth opportunity at each, comprises: the CQI value of code word 0 in this first-selection subband, and the L bit flag of first-selected subband; Transmission on the subband of selecting in this CQI value portions of bandwidth that only a last step of reaction determines; When RI＞1, also comprise extra 3 bit subband space differential CQI values, its differential mode is the same; And suppose in all subbands, to use the single PMI that reports recently to calculate, and the 2nd PMI value of from codebook subset, selecting;

For transmission mode 4,8 and 9, the selection of first-selected subband and subband CQI value are calculated based on last RI that reports, and for other transmission mode, calculate based on RI=1.

In a sub-frame of uplink, an only corresponding a kind of CSI reporting types of carrier wave (Reporting Type), as shown in table 1; The maximum CSI number of bits of feedback of a carrier wave be 11 bits (wherein; For subband CQI pattern, subband index L is 2 bits to the maximum), cycle CSI transmission of Information adopts PUCCH format 2/2a/2b in the LTE-A Rel-10 system; Its maximum transfer capacity is 13 bits; Therefore only be supported in the CSI of a descending carrier of feedback in the sub-frame in the Rel-10 system, the CSI of each descending carrier reports and can pass through time division multiplexing (Time Division Multiplex, TDM) mode is fed back in principle.If exist a plurality of carrier waves need feed back CSI in the current subframe simultaneously, then according to reporting Type priority to select the CSI with carrier wave of high priority to report: that priority is the highest is Types 3,5; 6, secondly 2a is Types 2; 2b, 2c, 4; That priority is minimum is Types 1,1a.If exist a plurality of carrier waves to have identical high priority type simultaneously, then select to report the CSI of the carrier wave of minimum carrier index according to carrier index.

Table 1: every kind of PUCCH CSI reports the bit number of pattern

Wherein, antenna ports is an antenna port.Spatial multiplexing is a spatial reuse.

In addition, in LTE-A Rel-10CA system, for the UE that has disposed a plurality of carrier waves; If only (Primary Cell Pcell) receives data, then continues to use the Rel-8/9 behavior at main carrier; I.e. configuration according to higher level parameters simultaneousAckNackAndCQI determines whether to support ACK/NACK and cycle CSI in PUCCH, to transmit, if support, then adopts PUCCH format 2 (for extended cyclic prefix (CP; Or PUCCH format 2a/2b (for conventional CP) simultaneously transferring ACK/NACK and CSI Cyclic Prefix)); If do not support, then UE will lose cycle CQI/PMI/RI, feeding back ACK/NACK; If receive data at a plurality of carrier waves, then do not support ACK/NACK and cycle CQI/PMI/RI in PUCCH, to transmit, this moment, UE always lost cycle CQI/PMI/RI, feeding back ACK/NACK.

In realizing process of the present invention, the inventor finds to exist in the prior art following technical problem:

At present in the LTE-ARel-10 system; Consider that the CSI transmission capacity is limited, UE can only feed back the CSI of a descending carrier at a sub-frame of uplink, and considers that the feedback density of ACK/NACK and CSI is all bigger in the LTE-A system; In the current mechanism; It is also bigger that CSI is dropped the probability that does not report, so the base station can not in time obtain the CSI of a plurality of descending carriers, thereby influence the descending scheduling accuracy.The CSI of a plurality of descending carriers of support transmits simultaneously and does not also have concrete scheme at present.

Summary of the invention

The embodiment of the invention provides a kind of channel condition information transmission method and equipment, and how simultaneously the CSI that is used to solve a plurality of descending carriers the problem of transmission.

A kind of channel condition information CSI transmission method, this method comprises:

The terminal is confirmed and need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need be carried out the descending carrier that CSI compresses;

Said terminal is compressed the CSI that said needs carry out the descending carrier of CSI compression;

Said terminal is at the CSI of current sub-frame of uplink after the said needs of base station feedback carry out the corresponding compression of the descending carrier of CSI compression and the CSI that need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carries out the descending carrier correspondence the descending carrier of CSI compression except that said needs.

A kind of channel condition information CSI method of reseptance, this method comprises:

The descending carrier that need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need carry out the CSI compression at terminal is confirmed in the base station;

The CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression is confirmed in the base station;

The base station confirm after the needs at said terminal carry out the corresponding compression of the descending carrier of CSI compression the CSI number of bits of feedback, with the corresponding CSI number of bits of feedback sum of descending carrier the descending carrier that CSI compresses of need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carrying out at said terminal except that said needs; For said terminal in the CSI of current sub-frame of uplink actual feedback number of bits of feedback; And according to the CSI number of bits of feedback of said actual feedback, the CSI in current sub-frame of uplink feedback decodes to said terminal.

A kind of terminal, this terminal comprises:

Determination module is used for confirming and need need carries out the descending carrier that CSI compresses at a plurality of descending carriers of current sub-frame of uplink feedback CSI;

Compression module, the CSI that is used for said needs are carried out the descending carrier of CSI compression compresses;

Feedback module is used at the CSI of current sub-frame of uplink after the said needs of base station feedback carry out the corresponding compression of the descending carrier of CSI compression and the CSI that need carry out the descending carrier correspondence the descending carrier of CSI compression at a plurality of descending carriers of current sub-frame of uplink feedback CSI except that said needs.

A kind of base station, this base station comprises:

The carrier wave determination module, what be used for definite terminal need need carry out the descending carrier that CSI compresses at a plurality of descending carriers of current sub-frame of uplink feedback CSI;

The bit number determination module is used for confirming the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression;

Receiver module; The needs that are used for confirming said terminal carry out after the corresponding compression of the descending carrier of CSI compression the CSI number of bits of feedback, with said terminal need carry out the corresponding CSI number of bits of feedback sum of descending carrier the descending carrier that CSI compresses at a plurality of descending carriers of current sub-frame of uplink feedback CSI except that said needs; For said terminal in the CSI of current sub-frame of uplink actual feedback number of bits of feedback; And according to the CSI number of bits of feedback of said actual feedback, the CSI in current sub-frame of uplink feedback decodes to said terminal.

In the scheme that the embodiment of the invention provides, the terminal is confirmed and need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need be carried out the descending carrier that CSI compresses; The CSI that said needs is carried out the descending carrier of CSI compression compresses; And at the CSI of current sub-frame of uplink after the said needs of base station feedback carry out the corresponding compression of the descending carrier of CSI compression and the CSI that need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carries out the descending carrier correspondence the descending carrier of CSI compression except that said needs; The base station then receives the CSI that transmits on the sub-frame of uplink according to the method for correspondence.It is thus clear that the present invention compresses the CSI that has realized transmitting simultaneously at same sub-frame of uplink a plurality of descending carriers through self adaptation to CSI, solved technical problem to be solved by this invention.

Description of drawings

Fig. 1 is a carrier aggregation system sketch map of the prior art;

The method flow sketch map that Fig. 2 provides for the embodiment of the invention;

Another method schematic flow sheet that Fig. 3 provides for the embodiment of the invention;

The device structure sketch map that Fig. 4 provides for the embodiment of the invention;

Another device structure sketch map that Fig. 5 provides for the embodiment of the invention.

Embodiment

For the CSI that the solves a plurality of descending carriers problem of transmission how simultaneously; The embodiment of the invention provides a kind of CSI transmission method; In this method; After the CSI that the descending carrier of CSI compression is carried out to the needs of determining in the terminal compresses, the CSI after the compression and the CSI that need not carry out the descending carrier of CSI compression are transmitted at current sub-frame of uplink simultaneously.

Referring to Fig. 2, the CSI transmission method that the embodiment of the invention provides may further comprise the steps:

Step 20: the terminal is confirmed and need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need be carried out the descending carrier that CSI compresses;

Step 21: the terminal is compressed the CSI that said needs carry out the descending carrier of CSI compression;

Step 22: the terminal is at the CSI of current sub-frame of uplink after the said needs of base station feedback carry out the corresponding compression of the descending carrier of CSI compression and the CSI that need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carries out the descending carrier correspondence the descending carrier of CSI compression except that said needs.

In the step 20, the terminal confirms that the descending carrier that need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need carry out the CSI compression, its concrete realization can adopt a kind of in following three kinds of methods:

The first, the terminal is the CSI reporting types of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI as required, the descending carrier of confirming to carry out the CSI compression;

The second, the terminal is confirmed in a plurality of descending carriers of current sub-frame of uplink feedback CSI, to belong to the descending carrier in the descending carrier set that system defines in advance or high-level signaling is pre-configured, the descending carrier that carries out the CSI compression for needs;

The 3rd, the terminal is the priority of each descending carrier and/or the priority of CSI reporting types in a plurality of descending carriers of current sub-frame of uplink feedback CSI as required, the descending carrier of confirming to carry out the CSI compression.

In the above-mentioned first method, the terminal descending carrier that the CSI reporting types of each descending carrier confirms to carry out the CSI compression in a plurality of descending carriers of current sub-frame of uplink feedback CSI as required, its concrete realization can be following:

Whether terminal judges need surpass the bit number threshold value by the corresponding CSI bit number of CSI reporting types of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI; If; Then confirm and need the CSI of the corresponding descending carrier of this CSI reporting types be compressed; Otherwise, do not need to confirm the CSI of the corresponding descending carrier of this CSI reporting types to compress.

Preferable, said bit number threshold value is 4 or 5.

In the step 21, the terminal is compressed the CSI that said needs carry out the descending carrier of CSI compression, can adopt following two kinds of methods:

Method one: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprised PMI information, the PMI information in the CSI reporting types that this descending carrier is corresponding of terminal was given up, with the CSI of remaining CSI after as compression; Perhaps,

Method two: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprised CQI information, the CQI information in the CSI reporting types that this descending carrier is corresponding of terminal was given up, with the CSI of remaining CSI after as compression.

Preferable, when the CSI that a pair of said needs of employing method carry out the descending carrier of CSI compression at the terminal compressed, the terminal was also compressed the corresponding many code words CQI of the said descending carrier of many codeword transmission, and concrete compression method is exemplified below:

Example one, terminal select the CQI of a code word in many code words as the CSI after compressing, and give up the CQI of all the other code words,

Example two, the CQI of a code word in many code words is selected at the terminal, and confirms the indication information of the code word that the CQI of said selection is corresponding, with the CQI of said selection code word and the said indication information CSI after as compression, gives up the CQI of all the other code words;

Example three, the CQI of a code word in many code words is selected at the terminal, and confirms the 1 or 2 bit space difference values of the CQI of all the other code words with respect to the CQI of said selection code word, with the CQI of said selection code word and the said space parallax score value CSI after as compression;

Example four, the average of the CQI of each code word in many code words is confirmed at the terminal, as the CSI after the compression.

Concrete, making an appointment or high-level signaling that the base station issues of terminal basis and base station confirms to select the CQI of which code word in many code words; Perhaps,

The CQI of which code word in many code words is confirmed to select according to channel condition in the terminal; Perhaps,

The CQI of which code word in many code words is confirmed to select according to the CQI of the predefined code word that is used for confirming to give up in the base station skew OFFSET value with respect to the CQI that reports code word in the terminal.

Preferable, when the CSI that a pair of said needs of employing method carry out the descending carrier of CSI compression at the terminal compressed, if the CSI after the compression comprises CQI, then this CQI calculated according to fixing PMI.

Said fixing PMI is that a pre-configured PMI of high-level signaling is passed through in the base station, perhaps is a PMI who makes an appointment in terminal and base station, and the needs that perhaps report for terminal the last time carry out the corresponding PMI of descending carrier of CSI compression.

Preferable, before the CSI of the descending carrier that said needs is carried out the CSI compression compressed, the terminal was chosen a kind of method according to the high-level signaling that the base station issues from said two kinds of methods; And adopting the method for choosing, the CSI that said needs is carried out the descending carrier of CSI compression compresses.

Preferable, when the terminal was compressed at the CSI of the descending carrier that said needs is carried out the CSI compression, the CSI that comprises the descending carrier of subband CQI in the CSI reporting types corresponding in the descending carrier that said needs carry out the CSI compression can be at first given up at the terminal.

Preferable; After step 21, before the step 22; If total CSI bit number that said needs carry out the CSI after the corresponding compression of the descending carrier of CSI compression and need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carry out the CSI of the descending carrier correspondence the descending carrier of CSI compression except that said needs; Surpass CSI transmission upper limit bit; Then the terminal is according to the priority of the CSI reporting types of the priority of each descending carrier in said a plurality of descending carriers and/or each descending carrier; The CSI that need in current subframe, feed back part descending carrier in a plurality of descending carriers of CSI gives up, and makes the bit number of remaining CSI be no more than said CSI transmission upper limit bit; So, in the step 22, the terminal is carried out CSI at current sub-frame of uplink to base station feedback and is given up the remaining CSI in back.

In the step 22, Physical Uplink Control Channel (PUCCH) or Physical Uplink Shared Channel (PUSCH) can be passed through to base station feedback CSI in the terminal.

In this method, said CSI information can comprise: a kind of or combination in any in CQI information, PMI information, RI information, the PTI information.

Referring to Fig. 3, the embodiment of the invention provides a kind of CSI method of reseptance, may further comprise the steps:

Step 30: the descending carrier that need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need carry out the CSI compression at terminal is confirmed in the base station;

Step 31: the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression is confirmed in the base station;

Step 32: the base station confirm after the needs at said terminal carry out the corresponding compression of the descending carrier of CSI compression the CSI number of bits of feedback, with the corresponding CSI number of bits of feedback sum of descending carrier the descending carrier that CSI compresses of need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carrying out at said terminal except that said needs; For said terminal in the CSI of current sub-frame of uplink actual feedback number of bits of feedback; And according to the CSI number of bits of feedback of said actual feedback, the CSI in current sub-frame of uplink feedback decodes to said terminal.

In the step 30, the descending carrier that need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need carry out the CSI compression at said terminal, base station, its concrete realization can be adopted a kind of in following three kinds of methods:

The first, the base station is according to the CSI reporting types of needs each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI at said terminal, the descending carrier of confirming to carry out the CSI compression;

The second, what said terminal was confirmed in the base station need belong to the descending carrier in the descending carrier set that system defines in advance or high-level signaling is pre-configured, the descending carrier that carries out the CSI compression for needs in a plurality of descending carriers of current sub-frame of uplink feedback CSI;

The 3rd, the base station is according to the priority of needs each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI at said terminal and/or the priority of CSI reporting types, the descending carrier of confirming to carry out the CSI compression.

In the above-mentioned first method, the base station is confirmed to carry out the descending carrier that CSI compresses according to the CSI reporting types of needs each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI at terminal, and its concrete realization can be following:

The said terminal of base station judges need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, whether surpass the bit number threshold value by the corresponding CSI bit number of the CSI reporting types of each descending carrier; If; Confirm that then corresponding descending carrier is for carrying out the descending carrier of CSI compression; Otherwise, confirm that corresponding descending carrier is not for carrying out the descending carrier of CSI compression.

Preferable, said bit number threshold value is 4 or 5.

In the step 31, the base station confirms that said needs carry out the method for the CSI number of bits of feedback after the corresponding compression of the descending carrier of CSI compression, specifically can adopt following two kinds of methods:

Method one: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprises PMI information; The base station confirms that the PMI information in the CSI reporting types that this descending carrier is corresponding of said terminal gives up, with the number of bits of feedback of the remaining CSI CSI number of bits of feedback after as compression; Perhaps,

Method two: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprises CQI information; The base station confirms that the CQI information in the CSI reporting types that this descending carrier is corresponding of said terminal gives up, with the number of bits of feedback of the remaining CSI CSI number of bits of feedback after as compression.

Preferable; When base station employing method one is confirmed the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression; The base station confirms that the method for confirming is exemplified below to the CSI number of bits of feedback after the corresponding many code words CQI compression of the said descending carrier of many codeword transmission:

Example one, the CSI number of bits of feedback of the number of bits of feedback of the CQI of a code word after in base station selected many code words as compression, and judge that said terminal gives up the CQI of all the other code words;

Example two, the CSI number of bits of feedback of the number of bits of feedback of the CQI of a code word after in base station selected many code words as compression, and according to the CQI of definite all the other code words of predefined skew OFFSET value;

Example three; The CQI of a code word in base station selected many code words; And confirm to comprise in the CSI report of said descending carrier the indication information of the corresponding code word of the CQI that is used to indicate selection; With the bit number sum of the number of bits of feedback of the CQI of said selection code word and the said indication information CSI number of bits of feedback after as compression, and judge that said terminal gives up the CQI of all the other code words;

Example four; The CQI of a code word in base station selected many code words; And confirm to comprise in the CSI report of said descending carrier and be used to indicate the CQI of remainder code word to divide value information with respect to the space parallax of the CQI of said selection code word, with the number of bits of feedback of the CQI of said selection code word and bit number sum that said space parallax the is divided value information CSI number of bits of feedback after as compression;

Example five, base station are confirmed the corresponding number of bits of feedback of average of the CQI of each code word in many code words, as the CSI number of bits of feedback after the compression.

Concrete, base station basis and terminal make an appointment or according to the configuration of notifying through high-level signaling to UE, the CSI number of bits of feedback after confirming to select the CQI of which code word in many code words to confirm to compress; Perhaps, the base station is according to predefined skew (OFFSET) value that is used to confirm the CQI of the code word given up with respect to the CQI that reports code word, the CSI number of bits of feedback after confirming to select the CQI of which code word in many code words to confirm to compress.

Preferable, when base station employing method one was confirmed the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression, if the CSI after the compression comprises CQI, then the base station confirmed that this CQI calculates according to fixing PMI.

Said fixing PMI is that a pre-configured PMI of high-level signaling is passed through in the base station, perhaps is a PMI who makes an appointment in base station and terminal, and the said needs that perhaps report for terminal the last time carry out the corresponding PMI of descending carrier of CSI compression.

Preferable, before the CSI number of bits of feedback of confirming after said needs carry out the corresponding compression of the descending carrier of CSI compression, a kind of method is chosen in the base station from said two kinds of methods, send to said terminal through high-level signaling; And adopt the method choose, confirm the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression.

Preferable; Between step 31 and step 32; The base station further judge said UE will be in said a plurality of descending carriers the corresponding CSI reporting types CSI that comprises the descending carrier of subband CQI give up, according to the CSI number of bits of feedback after removing descending carrier beyond the descending carrier that said CSI reporting types comprises subband CQI in said a plurality of descending carriers and confirming to compress.Also promptly, the base station is carried out the needs of confirming in the step 31 descending carrier that corresponding CSI reporting types in the descending carrier of CSI compression comprises subband CQI and is given up; Accordingly, the CSI number of bits of feedback after remaining needs carry out the corresponding compression of each descending carrier of CSI compression is confirmed in the base station in the step 31; In the step 32 base station confirm after said remaining needs carry out the corresponding compression of the descending carrier of CSI compression the CSI number of bits of feedback, with need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carry out descending carrier that CSI compresses except that said needs the corresponding CSI number of bits of feedback sum of descending carrier; For said terminal in the CSI of current sub-frame of uplink actual feedback number of bits of feedback; And according to the CSI number of bits of feedback of said actual feedback, the CSI in current sub-frame of uplink feedback decodes to the terminal.

Preferable; In the step 32; The CSI number of bits of feedback of the actual feedback that basis is confirmed in the base station; To the terminal before the CSI of current sub-frame of uplink feedback decodes; If said needs carry out the CSI number of bits of feedback after the corresponding compression of the descending carrier of CSI compression and need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carry out the corresponding CSI number of bits of feedback sum of descending carrier the descending carrier of CSI compression except that said needs, transmit upper limit bit above CSI, then the base station is according to the priority of each descending carrier in said a plurality of descending carriers and/or the priority of CSI reporting types; Judge that said terminal gives up the CSI of the part descending carrier in said a plurality of descending carriers; Make the total bit number of CSI of remaining descending carrier be no more than said CSI transmission upper limit bit, and, confirm as said terminal again in the CSI of current sub-frame of uplink actual feedback number of bits of feedback with the total number of bits of feedback of the CSI of remaining descending carrier; So, in the step 32, in the CSI of current sub-frame of uplink actual feedback number of bits of feedback, the CSI in current sub-frame of uplink feedback decodes to the terminal according to the said terminal of confirming again in the base station.

In the step 32, the base station can receive the CSI of said terminal feedback through PUCCH or PUSCH.

In this method, said CSI information comprises: a kind of or combination in any in CQI information, PMI information, RI information, the PTI information.

The mutual implementation method of end side of the present invention and base station side is following:

At first, the terminal is confirmed and need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need be carried out the descending carrier that CSI compresses; The CSI that said needs is carried out the descending carrier of CSI compression compresses; At the CSI of current sub-frame of uplink after the said needs of base station feedback carry out the corresponding compression of the descending carrier of CSI compression and the CSI that need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carries out the descending carrier correspondence the descending carrier of CSI compression except that said needs.

Then, the descending carrier that need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need carry out the CSI compression at terminal is confirmed in the base station; Confirm the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression; The needs of confirming said terminal carry out after the corresponding compression of the descending carrier of CSI compression the CSI number of bits of feedback, with the corresponding CSI number of bits of feedback sum of descending carrier the descending carrier that CSI compresses of need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carrying out at said terminal except that said needs; For said terminal in the CSI of current sub-frame of uplink actual feedback number of bits of feedback; And according to the CSI number of bits of feedback of said actual feedback, the CSI in current sub-frame of uplink feedback decodes to the terminal.

Specify in the face of invention down:

The present invention can be applied in the LTE-A CA system, the UE polymerization under the scene of a plurality of descending carriers.

Step 1:UE confirms to carry out the descending carrier of CSI compression, and is specific as follows:

Method A:UE is the CSI reporting types (Reporting Type) of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI as required, the descending carrier of confirming to carry out the CSI compression;

Method B:UE confirms that the descending carrier that need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, belong in the descending carrier set that system defines in advance or high-level signaling is pre-configured is the descending carrier that need carry out the CSI compression; The descending carrier that promptly need carry out CSI compression is predefined or high-level signaling is pre-configured in the system, and UE only compresses the CSI of these descending carriers; A sub-set or complete or collected works in the descending carrier set that the pre-configured descending carrier set of definition in advance or high-level signaling can be disposed for UE/activate in the said system;

The method C:UE descending carrier that the priority of the priority of each descending carrier and/or CSI reporting types confirms to carry out the CSI compression in a plurality of descending carriers of current sub-frame of uplink feedback CSI as required; For example: the CSI of descending carrier that preferentially compresses the low descending carrier of priority and/or have the CSI reporting types of low priority; Wherein descending carrier priority can be for predefined in the system, and perhaps high-level signaling disposes, and perhaps defines according to carrier index; Wherein CSI reporting types priority can be for predefined in the system, and perhaps high-level signaling disposes, and perhaps is to confirm according to the corresponding CSI information type of this CSI reporting types, for example; The priority that defines the CSI reporting types in the system in advance is: Types 3,5,6, and 2a has limit priority; Secondly be Types 2,2b, 2c, 4; That priority is minimum is Types 1,1a, and again for example, the reporting types priority that comprises RI information is the highest (like Type 3; 5,6), secondly for the reporting types that comprises broadband CQI (like Type 2,2b; 2c, 4), secondly for the reporting types that comprises subband CQI (like Type 1,1a) or only comprise the reporting types (like Type 2a) of PMI.

When employing method A, this method specifically comprises:

The descending carrier that the CSI number of bits of feedback that is comprised for the CSI reporting types is no more than the T bit does not compress its CSI; More excellent T=4 or 5;

For example, when T=4, the said reporting types of not compressing comprises Type 3,4,6,2a;

Again for example, when T=5, the said reporting types of not compressing comprises Type 3,4,5,6,2a;

The descending carrier that the CSI number of bits of feedback that is comprised for the CSI reporting types surpasses the T bit compresses its CSI;

For example, when T=4, the reporting types that said needs compress comprises Type 1,1a, 2,2b, 2c, 5;

Again for example, when T=5, the reporting types that said needs compress comprises Type 1,1a, 2,2b, 2c;

Step 2:UE compresses the CSI that the needs of determining carry out the descending carrier of CSI compression, specifically can adopt following method 1-method 3:

Method 1: give up (Drop) PMI;

For the reporting types that comprises CQI and PMI, drop PMI only reports CQI, and this CQI calculates based on fixing PMI;

Said fixedly PMI can be 1 pre-configured PMI of high-level signaling, perhaps is a PMI who makes an appointment in UE and base station, perhaps is the last corresponding PMI of this descending carrier that reports;

The above-mentioned reporting types that comprises CQI and PMI specifically can promptly can be applicable to the reporting types that all comprise CQI and PMI for Type 1,1a, 2,2b, 2c, does not distinguish broadband CQI and subband CQI; Perhaps, be Type 2,2b, 2c, promptly only be applied to comprise the reporting types of broadband CQI;

For the reporting types that comprises RI, drop PMI only reports RI, the RI independent numbering;

The above-mentioned reporting types that comprises RI specifically can be Type 5;

More excellent, when compressing, can only use above-mentioned compression scheme to 4 layers (Layer) and 8 layers of transmission situation for the reporting types that comprises RI;

More excellent, for the reporting types that comprises CQI, also can compress (RI＞1 o'clock) to many code words CQI according to following method A-method E:

Method A: only report the CQI of a code word, the CQI of another code word of drop;

Specifically report the CQI of which code word to make an appointment, perhaps high-rise prenoticing for UE and base station; For example, agreement or notice UE only report the CQI of code word 0, the CQI of drop code word 1;

Method B: only report the CQI of 1 code word, increase the corresponding code word of the said CQI that reports of extra indication information indication; For example, when adopting 1 bit indication information, the corresponding relation of 1 bit indication information and code word is as shown in table 2, and table 2 is an example just, does not get rid of other corresponding relations;

The said CQI that reports code word can be the CQI value (being the CQI value of the bigger code word of CQI index) of the code word that has better channel condition in a plurality of code words;

1 bit indication information	The codeword number of indication
		0	0
1	1

The corresponding relation of table 21 bit indication information and code word

Method C: only report the CQI of 1 code word, the CQI of another code word can obtain based on fixing offset value, said offset value can for UE and base station make an appointment perhaps high-level signaling is pre-configured;

Specifically report the CQI value of which code word to make an appointment for UE and base station, perhaps high-rise prenoticing is relevant with the definition of offset; For example; If offset is defined as negative value; The CQI that the code word that does not report is described then should arrange or dispose the CQI value (being the CQI value of the bigger code word of CQI index) that reports the code word that has better channel condition in a plurality of code words than the CQI that reports code word poor (index is little); If offset be defined as on the occasion of, the CQI that the code word that does not report is described then should arrange or dispose the CQI value (being the CQI value of the less code word of CQI index) that reports the code word that has poor channel conditions in a plurality of code words than the CQI that reports code word good (index is big);

Method D: report the CQI of 1 code word, and the CQI of another code word is based on the 1or 2 bit space difference values of the CQI that reports code word;

Specifically report the CQI value of which code word to make an appointment, perhaps high-rise prenoticing for UE and base station; For example, agreement or notice UE report the CQI of code word 0, and the CQI of code word 1 adopts the space differential mode to represent the offset level (offset level) with respect to the CQI of code word 0: the CQI index of the CQI index-code word 1 of code word 1 offset level=code word 0; The corresponding relation of 1 bit space difference value and code word 1 offset level is as shown in table 3; When this 1 bit space difference value is received in the base station; The CQI index that can judge the code word that UE do not report is lower than or is higher than the CQI index that reports code word; But can not obtain not report code word CQI value accurately, the base station can combine UE transmission channel situation to estimate the CQI that does not report code word; The corresponding relation of 2 bit space difference values and code word 1 offset level is as shown in table 4; When the base station receives that this 2 bit space difference value is 0 or 1; Can directly obtain not report the CQI of code word according to the space parallax score value; It is CQI index-code word 1 offset level (i.e. 2 bit space difference values) of the CQI index=code word 0 of code word 1; When the base station received that this 2 bit space difference value is 2 or 3, the CQI index that can judge the code word that UE do not report was lower than the CQI index value more than 2 or 2 that reports code word, perhaps was higher than the CQI index value more than 1 or 1 that reports code word; But can not obtain not report code word CQI value accurately, the base station can combine UE transmission channel situation to estimate the CQI that does not report code word; Wherein, table 3 and table 4 are merely the corresponding relation example, do not get rid of other corresponding relations;

1 bit space difference value	Offset level
		0	≥0
1	＜0

The corresponding relation of table 31 bit space difference value and offset level

2 bit space difference values	Offset level
		0	0
1	1
		2	≥2
3	≤-1

The corresponding relation of table 42 bit space difference values and offset level

Method E: the average that reports the CQI of 2 code words;

Be that UE obtains the corresponding CQI index of each code word, CQI average=(the CQI index of the CQI index+ code word 1 of code word 0)/2 respectively; When the base station receives this average, can estimate the CQI value of each code word, be used for the descending scheduling reference with this average as the CQI value of each code word or through self adaptation adjustment and compensation;

Method 2:Drop CQI only transmits PMI; This mode only is applicable to the reporting types that comprises CQI;

PMI can further adopt the PMI that reports in the pre-configured PMI codebook subset (codebook subset) of high-level signaling to reduce number of bits of feedback, the PMI index independent numbering in this PMI subset of code words;

Method 3: the pre-configured UE of high-level signaling need carry out reporting types transmission or which kind of channel information of drop of CSI compression to this type of;

Be that CSI compression method that UE adopts is a kind of in method 1 and the method 2 of high-level signaling configuration, UE needs to receive earlier high-level signaling, CSI is compressed after parsing corresponding collocation method again; When high-level signaling configuration UE drop PMI, 1 mode is worked according to the method described above; When high-level signaling configuration UE drop CQI, work according to method 2 modes;

In addition; When adopting any one method in above-mentioned 3 kinds of methods to carry out the CSI compression; Be the descending carrier that comprises the reporting types of subband CQI for the CSI reporting types, more excellent, the CSI of this descending carrier of drop; Be that UE need not carry out above-mentioned compression step to the CSI of the corresponding descending carrier of the reporting types that comprises subband CQI, the direct CSI of this descending carrier of drop;

The above-mentioned reporting types that comprises subband CQI specifically can be Type 1,1a.

Special; If through after the above-mentioned compression; The CSI feedback bits sum of a plurality of descending carriers still surpasses CSI transmission upper limit bit; Then need further to accept or reject according to reporting types priority and/or descending carrier priority; The CSI feedback information of choosing the descending carrier with the higher CSI reporting types of priority and/or having a higher priority descending carrier transmits, and abandons descending carrier with the low CSI reporting types of priority and/or the CSI feedback information with lower priority descending carrier successively, is no more than CSI transmission upper limit bit up to total bit number of CSI feedback information;

Above-mentioned CSI transmission upper limit bit is that system is predefined; Perhaps high-level signaling/PDCCH signaling disposes; Perhaps make an appointment in UE and base station; Perhaps being UE confirms according to transmission CSI employed PUCCH format, perhaps transmits employed PUCCH format for UE simultaneously according to CSI and ACK/NACK and/or dispatch request (SR) and the bit number of the ACK/NACK that transmits simultaneously at same sub-frame of uplink with CSI and/or SR is definite;

More excellent, above-mentioned CSI transmission upper limit bit is the arbitrary integer that is no more than the maximum transmitted bit number A of the employed PUCCH format of transmission CSI; Perhaps; For being no more than arbitrary integer of A-K bit; Wherein A is the maximum transmitted bit number that CSI and ACK/NACK and/or SR transmit employed PUCCH format simultaneously, and K is the ACK/NACK that transmits simultaneously at same sub-frame of uplink with CSI and/or the bit number of SR;

More excellent, carrier wave priority defines based on carrier index, and the carrier wave priority that for example has minimum carrier index is the highest; Perhaps, carrier wave priority also can be predefined in the system (being to make an appointment in UE and base station), perhaps for high-level signaling configuration;

More excellent, can define priority according to the CSI information type of transmitting in the reporting types;

For example, the reporting types priority the highest (like Type 3,5,6) that comprises RI information; Secondly for the reporting types that comprises broadband CQI (like Type 2,2b, 2c; 4), secondly for the reporting types that comprises subband CQI (like Type 1,1a) or only comprise the reporting types (like Type 2a) of PMI;

The priority of reporting types is also can be for system predefined or high-level signaling is pre-configured, and for example, the priority of CSI reporting types is: Types 3,5; 6,2a has limit priority, is Types2 secondly, 2b; 2c, 4, that priority is minimum is Types 1,1a;

Step 3:UE is at the CSI of current sub-frame of uplink after base station feedback need be carried out the corresponding compression of the descending carrier of CSI compression and the CSI that need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carries out the descending carrier correspondence the descending carrier of CSI compression except that said needs.

Base station side adopts the mode consistent with the UE side to confirm UE in the CSI of current sub-frame of uplink actual feedback number of bits of feedback, and according to the CSI number of bits of feedback of said actual feedback, and the CSI of terminal feedback is decoded.

Above-mentioned CSI information comprises the one or any combination among CQI, PMI, RI, the PTI;

Above-mentioned high-level signaling can be radio resource control RRC (Radio Resource Control) or media access control MAC (Media Access Control) signaling, or the physical downlink control channel PDCCH signaling;

Need to prove; When having ACK/NACK feedback information and/or SR information simultaneously in the sub-frame of uplink that has the CSI transmission; Said method is suitable equally, can support CSI feedback information and the ACK/NACK feedback information and/or the transmission of SR information combined coding of multicarrier, for example adopts PUCCH format2/2a/2b/3; The PUCCH format 3 that perhaps expands, perhaps other schemes.

Need to prove that said method is not only applicable to the transmission of cycle CSI feedback information on PUCCH, go for the transmission of cycle CSI feedback information on PUSCH equally.

Need to prove; The Compression and Transmission method of multicarrier CSI in the above-mentioned LTE-A CA system goes for cooperative multipoint transmission (Coordinated Multi-Point Transmission equally; CoMP) scene, the CSI of a plurality of transmission points that in the CoMP transmission, need feed back can be equal to the CSI of above-mentioned a plurality of carrier waves.

Referring to Fig. 4, the embodiment of the invention provides a kind of terminal, and this terminal comprises:

Determination module 40 is used for confirming and need need carries out the descending carrier that CSI compresses at a plurality of descending carriers of current sub-frame of uplink feedback CSI;

Compression module 41, the CSI that is used for said needs are carried out the descending carrier of CSI compression compresses;

Feedback module 42 is used at the CSI of current sub-frame of uplink after the said needs of base station feedback carry out the corresponding compression of the descending carrier of CSI compression and the CSI that need carry out the descending carrier correspondence the descending carrier of CSI compression at a plurality of descending carriers of current sub-frame of uplink feedback CSI except that said needs.

Further, said determination module 40 is used for:

The CSI reporting types of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI is confirmed to carry out the descending carrier that CSI compresses as required; Perhaps,

Confirm in a plurality of descending carriers of current sub-frame of uplink feedback CSI, to belong to the descending carrier in the descending carrier set that system defines in advance or high-level signaling is pre-configured, the descending carrier that carries out the CSI compression for needs; Perhaps,

The priority of each descending carrier and/or the priority of CSI reporting types in a plurality of descending carriers of current sub-frame of uplink feedback CSI are confirmed to carry out the descending carrier that CSI compresses as required.

Said determination module 40 is used for:

According to the following method CSI reporting types of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI as required, the descending carrier of confirming to carry out the CSI compression:

Whether judgement need surpass the bit number threshold value by the corresponding CSI bit number of CSI reporting types of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI; If; Then confirm and need the CSI of the corresponding descending carrier of this CSI reporting types be compressed; Otherwise, do not need to confirm the CSI of the corresponding descending carrier of this CSI reporting types to compress.

Further, said bit number threshold value is 4 or 5.

Further, said compression module 41 is used for: according to following method one or method two the CSI that said needs carry out the descending carrier of CSI compression is compressed:

Method one: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprised pre-coding matrix indication PMI information, the PMI information in the CSI reporting types that this descending carrier is corresponding was given up, with the CSI of remaining CSI after as compression;

Method two: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprised channel quality indicator (CQI) information, the CQI information in the CSI reporting types that this descending carrier is corresponding was given up, with the CSI of remaining CSI after as compression.

Further, said compression module 41 also is used for: when the CSI that carries out the descending carrier of CSI compression at a pair of said needs of employing method compressed, the many code word CQI corresponding to the said descending carrier of many codeword transmission compressed, and comprising:

The CQI that selects a code word in many code words gives up the CQI of all the other code words as the CSI after compressing; Perhaps,

Select the CQI of a code word in many code words, and confirm the indication information of the code word that the CQI of said selection is corresponding,, give up the CQI of all the other code words the CQI of said selection code word and the said indication information CSI after as compression; Perhaps,

Select the CQI of a code word in many code words, and confirm the 1 or 2 bit space difference values of the CQI of all the other code words, with the CQI of said selection code word and the said space parallax score value CSI after as compression with respect to the CQI of said selection code word; Perhaps,

Confirm the average of the CQI of each code word in many code words, as the CSI after the compression.

Further, said compression module 41 is used for:

According to the making an appointment or high-level signaling that the base station issues of base station, confirm to select the CQI of which code word in many code words; Perhaps,

According to channel condition, confirm to select the CQI of which code word in many code words; Perhaps,

According to the CQI of the predefined code word that is used for confirming to give up in the base station skew OFFSET value, confirm to select the CQI of which code word in many code words with respect to the CQI that reports code word.

Further, said compression module 41 also is used for:

When the CSI that carries out the descending carrier of CSI compression at a pair of said needs of employing method compresses,, then calculate this CQI according to fixing PMI if the CSI after the compression comprises CQI.

Further, said fixing PMI is that a pre-configured PMI of high-level signaling is passed through in the base station, perhaps is a PMI who makes an appointment in terminal and base station, and the said needs that perhaps report for terminal the last time carry out the corresponding PMI of descending carrier of CSI compression.

Further, said compression module 41 also is used for:

Before the CSI of the descending carrier that said needs is carried out the CSI compression compresses, from said two kinds of methods, choose a kind of method according to the high-level signaling that the base station issues; The method that employing is chosen, the CSI that said needs is carried out the descending carrier of CSI compression compresses.

Further, said compression module 41 also is used for:

When the CSI of the descending carrier that said needs is carried out CSI compression compresses, give up the CSI that comprises the descending carrier of subband CQI in the CSI reporting types corresponding in the descending carrier that said needs carry out the CSI compression.

Further, this terminal also comprises:

Give up module 43; The total CSI bit number that is used for the CSI after said needs carry out the corresponding compression of the descending carrier of CSI compression and need carries out the CSI of the descending carrier correspondence the descending carrier of CSI compression except that said needs at a plurality of descending carriers of current sub-frame of uplink feedback CSI; When surpassing CSI transmission upper limit bit; Priority according to the CSI reporting types of the priority of each descending carrier in said a plurality of descending carriers and/or each descending carrier; The CSI that need in current subframe, feed back part descending carrier in a plurality of descending carriers of CSI gives up, and makes the bit number of remaining CSI be no more than said CSI transmission upper limit bit;

Said feedback module 42 is used for: carry out CSI at current sub-frame of uplink to base station feedback and give up the remaining CSI in back.

Further, said feedback module 42 is used for: through PUCCH or PUSCH to base station feedback CSI.

Said CSI information comprises: a kind of or combination in any in CQI information, PMI information, RI information, the PTI information.

Referring to Fig. 5, the embodiment of the invention also provides a kind of base station, and this base station comprises:

Carrier wave determination module 50, what be used for definite terminal need need carry out the descending carrier that CSI compresses at a plurality of descending carriers of current sub-frame of uplink feedback CSI;

Bit number determination module 51 is used for confirming the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression;

Receiver module 52; The said needs that are used for confirming the terminal carry out after the corresponding compression of the descending carrier of CSI compression the CSI number of bits of feedback, with said terminal need carry out the corresponding CSI number of bits of feedback sum of descending carrier the descending carrier that CSI compresses at a plurality of descending carriers of current sub-frame of uplink feedback CSI except that said needs; For said terminal in the CSI of current sub-frame of uplink actual feedback number of bits of feedback; And according to the CSI number of bits of feedback of said actual feedback, the CSI in current sub-frame of uplink feedback decodes to said terminal.

Further, said carrier wave determination module 50 is used for:

According to the CSI reporting types of the needs at said terminal each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI, confirm that the needs at said terminal carry out the descending carrier of CSI compression; Perhaps,

That confirms said terminal need belong to the descending carrier in the descending carrier set that system defines in advance or high-level signaling is pre-configured, the descending carrier that carries out the CSI compression for the needs at said terminal in a plurality of descending carriers of current sub-frame of uplink feedback CSI; Perhaps,

According to the priority of the needs at said terminal each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI and/or the priority of CSI reporting types, confirm that the needs at said terminal carry out the descending carrier of CSI compression.

Said carrier wave determination module 50 is used for:

According to the CSI reporting types of following method, confirm that the needs at said terminal carry out the descending carrier of CSI compression according to needs each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI at said terminal:

Whether that judges said terminal need surpass the bit number threshold value by the corresponding CSI bit number of CSI reporting types of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI; If; Confirm that then corresponding descending carrier is for carrying out the descending carrier of CSI compression; Otherwise, confirm that corresponding descending carrier is not for carrying out the descending carrier of CSI compression.

Further, said bit number threshold value is 4 or 5.

Further, said bit number determination module 51 is used for: confirm the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression according to following method one or method two:

Method one: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprises pre-coding matrix indication PMI information; Confirm that the PMI information in the CSI reporting types that this descending carrier is corresponding of said terminal gives up, with the number of bits of feedback of the remaining CSI CSI number of bits of feedback after as compression;

Method two: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprises channel quality indicator (CQI) information; Confirm that the CQI information in the CSI reporting types that this descending carrier is corresponding of said terminal gives up, with the number of bits of feedback of the remaining CSI CSI number of bits of feedback after as compression.

Further; Said bit number determination module 51 also is used for: when employing method one is confirmed the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression; Confirm the CSI number of bits of feedback after the corresponding many code words CQI compression of the said descending carrier of many codeword transmission is comprised:

The CSI number of bits of feedback of the number of bits of feedback of selecting the CQI of a code word in many code words after as compression, and judge that said terminal gives up the CQI of all the other code words; Perhaps,

The CSI number of bits of feedback of the number of bits of feedback of selecting the CQI of a code word in many code words after as compression, and according to the CQI of definite all the other code words of predefined skew OFFSET value; Perhaps,

Select the CQI of a code word in many code words; And confirm to comprise in the CSI report of said descending carrier the indication information of the corresponding code word of the CQI that is used to indicate selection; With the bit number sum of the number of bits of feedback of the CQI of said selection code word and the said indication information CSI number of bits of feedback after as compression, and judge that said terminal gives up the CQI of all the other code words; Perhaps,

Select the CQI of a code word in many code words; And confirm to comprise in the CSI report of said descending carrier and be used to indicate the 1 or 2 bit space difference value information of the CQI of remainder code word with respect to the CQI of said selection code word, with the number of bits of feedback of the CQI of said selection code word and bit number sum that said space parallax the is divided value information CSI number of bits of feedback after as compression; Perhaps,

Confirm the corresponding number of bits of feedback of average of the CQI of each code word in many code words, as the CSI number of bits of feedback after the compression.

Further, said bit number determination module 51 is used for:

According to said terminal make an appointment or according to the configuration information of notifying through high-level signaling to said terminal, the CSI number of bits of feedback after confirm selecting the CQI of which code word in many code words to confirm to compress; Perhaps,

According to the predefined skew OFFSET value that is used to confirm the CQI of the code word given up with respect to the CQI that reports code word, the CSI number of bits of feedback after confirming to select the CQI of which code word in many code words to confirm to compress.

Further, said bit number determination module 51 is used for:

When employing method one is confirmed the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression,, confirm that then this CQI calculates according to fixing PMI if the CSI after the compression comprises CQI.

Further; Said fixing PMI is that said base station is through a pre-configured PMI of high-level signaling; Perhaps be a PMI who makes an appointment in said base station and said terminal, the said needs that perhaps report for said terminal the last time carry out the corresponding PMI of descending carrier of CSI compression.

Further, said bit number determination module 51 also is used for:

Before the CSI number of bits of feedback of confirming after said needs carry out the corresponding compression of the descending carrier of CSI compression, from said two kinds of methods, choose a kind of method, send to said terminal through high-level signaling; The method that employing is chosen is confirmed the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression.

Further, said bit number determination module 51 also is used for:

Judge that said terminal gives up the CSI that CSI reporting types corresponding in said a plurality of descending carriers comprises the descending carrier of subband CQI, according to the CSI number of bits of feedback of removing in said a plurality of descending carriers after descending carrier beyond the descending carrier that said CSI reporting types comprises subband CQI is confirmed compression.

Further, this base station also comprises:

Give up module 53; The CSI number of bits of feedback sum that is used for the descending carrier correspondence the descending carrier that need carry out the CSI compression except that said needs that needs at said terminal carry out CSI number of bits of feedback and said terminal after the corresponding compression of the descending carrier of CSI compression at a plurality of descending carriers of current sub-frame of uplink feedback CSI; When surpassing CSI transmission upper limit bit; According to the priority of each descending carrier in said a plurality of descending carriers and/or the priority of CSI reporting types; Judge that said terminal gives up the CSI of the part descending carrier in said a plurality of descending carriers; Make the total bit number of CSI of remaining descending carrier be no more than said transmission upper limit bit, and, confirm as said terminal again in the CSI of current sub-frame of uplink actual feedback number of bits of feedback with the total number of bits of feedback of the CSI of remaining descending carrier;

Said receiver module 52 is used for: said basis is given up the definite again said terminal of module in the CSI of current sub-frame of uplink actual feedback number of bits of feedback, and the CSI in current sub-frame of uplink feedback decodes to said terminal.

Further, said receiver module 52 is used for: the CSI that receives said terminal feedback through PUCCH or PUSCH.

Further, said CSI information comprises: a kind of or combination in any in CQI information, PMI information, RI information, the PTI information.

To sum up, beneficial effect of the present invention comprises:

The present invention has provided a kind of method of the CSI feedback information of a plurality of descending carriers being carried out Compression and Transmission; This method can be compressed according to the reporting types selectivity of the multicarrier CSI information CSI feedback information to the part carrier wave; With the total number of bits of feedback of reduction CSI, thereby support multicarrier CSI to transmit simultaneously, to improve CSI transmission of Information efficient; And then make the base station can in time obtain the CSI information of multicarrier, improve the accuracy of descending scheduling.

The present invention is that reference is described according to the flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the 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, make the instruction of carrying out through the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.

These computer program instructions also can be stored in ability vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work; Make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

These computer program instructions also can be loaded on computer or other programmable data processing device; Make on computer or other programmable devices and to carry out the sequence of operations step producing computer implemented processing, thereby the instruction of on computer or other programmable devices, carrying out is provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

Although described the preferred embodiments of the present invention, in a single day those skilled in the art get the basic inventive concept could of cicada, then can make other change and modification to these embodiment.So accompanying claims is intended to be interpreted as all changes and the modification that comprises preferred embodiment and fall into the scope of the invention.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. channel condition information CSI transmission method is characterized in that this method comprises:

2. the method for claim 1 is characterized in that, said terminal is confirmed and need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need be carried out the descending carrier that CSI compresses, comprising:

Said terminal is the CSI reporting types of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI as required, the descending carrier of confirming to carry out the CSI compression; Perhaps,

Said terminal is confirmed in a plurality of descending carriers of current sub-frame of uplink feedback CSI, to belong to the descending carrier in the descending carrier set that system defines in advance or high-level signaling is pre-configured, the descending carrier that carries out the CSI compression for needs; Perhaps,

Said terminal is the priority of each descending carrier and/or the priority of CSI reporting types in a plurality of descending carriers of current sub-frame of uplink feedback CSI as required, the descending carrier of confirming to carry out the CSI compression.

3. method as claimed in claim 2 is characterized in that, said terminal is the CSI reporting types of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI as required, and the descending carrier of confirming to carry out the CSI compression comprises:

Whether said terminal judges need surpass the bit number threshold value by the corresponding CSI bit number of CSI reporting types of each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI; If; Then confirm and need the CSI of the corresponding descending carrier of this CSI reporting types be compressed; Otherwise, do not need to confirm the CSI of the corresponding descending carrier of this CSI reporting types to compress.

4. method as claimed in claim 3 is characterized in that, said bit number threshold value is 4 or 5.

5. the method for claim 1 is characterized in that, the method that the CSI of the descending carrier of CSI compression compresses is carried out to said needs in said terminal, comprising:

Method one: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprises pre-coding matrix indication PMI information; PMI information in the CSI reporting types that this descending carrier is corresponding of said terminal is given up, with the CSI of remaining CSI after as compression; Perhaps,

Method two: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprises channel quality indicator (CQI) information; CQI information in the CSI reporting types that this descending carrier is corresponding of said terminal is given up, with the CSI of remaining CSI after as compression.

6. method as claimed in claim 5; It is characterized in that; When the CSI that a pair of said needs of employing method carry out the descending carrier of CSI compression at said terminal compressed, said terminal was also compressed the corresponding many code words CQI of the said descending carrier of many codeword transmission, comprising:

Said terminal selects the CQI of a code word in many code words as the CSI after compressing, and gives up the CQI of all the other code words; Perhaps,

The CQI of a code word in many code words is selected at said terminal, and confirms the indication information of the code word that the CQI of said selection is corresponding, with the CQI of said selection code word and the said indication information CSI after as compression, gives up the CQI of all the other code words; Perhaps,

The CQI of a code word in many code words is selected at said terminal, and confirms the 1 or 2 bit space difference values of the CQI of all the other code words with respect to the CQI of said selection code word, with the CQI of said selection code word and the said space parallax score value CSI after as compression; Perhaps,

The average of the CQI of each code word in many code words is confirmed at said terminal, as the CSI after the compression.

7. method as claimed in claim 6 is characterized in that, making an appointment or high-level signaling that the base station issues of said terminal basis and base station confirms to select the CQI of which code word in many code words; Perhaps,

The CQI of which code word in many code words is confirmed to select according to channel condition in said terminal; Perhaps,

The CQI of which code word in many code words is confirmed to select according to the CQI of the predefined code word that is used for confirming to give up in the base station skew OFFSET value with respect to the CQI that reports code word in said terminal.

8. method as claimed in claim 5 is characterized in that, when the CSI that a pair of said needs of employing method carry out the descending carrier of CSI compression at said terminal compressed, if the CSI after the compression comprises CQI, then this CQI calculated according to fixing PMI.

9. method as claimed in claim 8; It is characterized in that; Said fixing PMI is that a pre-configured PMI of high-level signaling is passed through in the base station; Perhaps be a PMI who makes an appointment in said terminal and base station, the said needs that perhaps report for said terminal the last time carry out the corresponding PMI of descending carrier of CSI compression.

10. method as claimed in claim 5 is characterized in that, before the CSI of the descending carrier that said needs is carried out the CSI compression compresses, further comprises:

Said terminal is chosen a kind of method according to the high-level signaling that the base station issues from said two kinds of methods;

The CSI that the descending carrier of CSI compression is carried out to said needs in said terminal compresses and comprises:

The method of choosing is adopted at said terminal, and the CSI that said needs is carried out the descending carrier of CSI compression compresses.

11. the method for claim 1 is characterized in that, when said terminal is compressed at the CSI of the descending carrier that said needs is carried out the CSI compression, further comprises:

The CSI that comprises the descending carrier of subband CQI in the CSI reporting types corresponding in the descending carrier that said needs carry out CSI compression is given up at the terminal.

12. like arbitrary described method among the claim 1-11; It is characterized in that; Said terminal current sub-frame of uplink after the said needs of base station feedback carry out the corresponding compression of the descending carrier of CSI compression CSI and need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carry out the CSI of the descending carrier correspondence the descending carrier of CSI compression except that said needs before, this method further comprises:

If total CSI bit number that said needs carry out the CSI after the corresponding compression of the descending carrier of CSI compression and need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carry out the CSI of the descending carrier correspondence the descending carrier of CSI compression except that said needs; Surpass CSI transmission upper limit bit; Then said terminal is according to the priority of the CSI reporting types of the priority of each descending carrier in said a plurality of descending carriers and/or each descending carrier; The CSI that need in current subframe, feed back part descending carrier in a plurality of descending carriers of CSI gives up, and makes the bit number of remaining CSI be no more than said CSI transmission upper limit bit;

Said terminal, comprising to the said CSI of base station feedback at current sub-frame of uplink:

Said terminal is carried out CSI at current sub-frame of uplink to base station feedback and is given up the remaining CSI in back.

13. like arbitrary described method among the claim 1-11, it is characterized in that, the terminal through Physical Uplink Control Channel PUCCH or Physical Uplink Shared Channel PUSCH to base station feedback CSI.

14., it is characterized in that said CSI information comprises like arbitrary described method among the claim 1-11:

A kind of or combination in any in channel quality indicator (CQI) information, pre-coding matrix indication PMI information, order indication RI information, the precoding type indication PTI information.

15. a channel condition information CSI method of reseptance is characterized in that this method comprises:

16. method as claimed in claim 15 is characterized in that, the descending carrier that need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, need carry out the CSI compression at said terminal is confirmed in said base station, comprising:

Said base station is according to the CSI reporting types of needs each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI at said terminal, the descending carrier of confirming to carry out the CSI compression; Perhaps,

What said terminal was confirmed in said base station need belong to the descending carrier in the descending carrier set that system defines in advance or high-level signaling is pre-configured, the descending carrier that carries out the CSI compression for needs in a plurality of descending carriers of current sub-frame of uplink feedback CSI; Perhaps,

Said base station is according to the priority of needs each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI at said terminal and/or the priority of CSI reporting types, the descending carrier of confirming to carry out the CSI compression.

17. method as claimed in claim 16; It is characterized in that; Said base station is according to the CSI reporting types of needs each descending carrier in a plurality of descending carriers of current sub-frame of uplink feedback CSI at said terminal, and the descending carrier of confirming to carry out the CSI compression comprises:

The said terminal of said base station judges need in a plurality of descending carriers of current sub-frame of uplink feedback CSI, whether surpass the bit number threshold value by the corresponding CSI bit number of the CSI reporting types of each descending carrier; If; Confirm that then corresponding descending carrier is for carrying out the descending carrier of CSI compression; Otherwise, confirm that corresponding descending carrier is not for carrying out the descending carrier of CSI compression.

18. method as claimed in claim 17 is characterized in that, said bit number threshold value is 4 or 5.

19. method as claimed in claim 15 is characterized in that, said base station confirms that said needs carry out the method for the CSI number of bits of feedback after the corresponding compression of the descending carrier of CSI compression, comprising:

Method one: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprises pre-coding matrix indication PMI information; Said base station confirms that the PMI information in the CSI reporting types that this descending carrier is corresponding of said terminal gives up, with the number of bits of feedback of the remaining CSI CSI number of bits of feedback after as compression; Perhaps,

Method two: when the corresponding CSI reporting types of descending carrier of carrying out CSI compression at said needs comprises channel quality indicator (CQI) information; Said base station confirms that the CQI information in the CSI reporting types that this descending carrier is corresponding of said terminal gives up, with the number of bits of feedback of the remaining CSI CSI number of bits of feedback after as compression.

20. method as claimed in claim 19; It is characterized in that; When said base station employing method one is confirmed the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression; Said base station is confirmed the CSI number of bits of feedback after the corresponding many code words CQI compression of the said descending carrier of many codeword transmission is comprised:

The CSI number of bits of feedback of the number of bits of feedback of the CQI of a code word after in said base station selected many code words as compression, and judge that said terminal gives up the CQI of all the other code words; Perhaps,

The CSI number of bits of feedback of the number of bits of feedback of the CQI of a code word after in said base station selected many code words as compression, and according to the CQI of definite all the other code words of predefined skew OFFSET value; Perhaps,

The CQI of a code word in said base station selected many code words; And confirm to comprise in the CSI report of said descending carrier the indication information of the corresponding code word of the CQI that is used to indicate selection; With the bit number sum of the number of bits of feedback of the CQI of said selection code word and the said indication information CSI number of bits of feedback after as compression, and judge that said terminal gives up the CQI of all the other code words; Perhaps,

The CQI of a code word in said base station selected many code words; And confirm to comprise in the CSI report of said descending carrier and be used to indicate the 1 or 2 bit space difference value information of the CQI of remainder code word with respect to the CQI of said selection code word, with the number of bits of feedback of the CQI of said selection code word and bit number sum that said space parallax the is divided value information CSI number of bits of feedback after as compression; Perhaps,

The corresponding number of bits of feedback of average of the CQI of each code word in many code words is confirmed in said base station, as the CSI number of bits of feedback after the compression.

21. method as claimed in claim 20; It is characterized in that; Said base station basis and said terminal make an appointment or according to the configuration information of notifying through high-level signaling to said terminal, the CSI number of bits of feedback after confirming to select the CQI of which code word in many code words to confirm to compress; Perhaps,

Said base station is according to the predefined skew OFFSET value that is used to confirm the CQI of the code word given up with respect to the CQI that reports code word, the CSI number of bits of feedback after confirming to select the CQI of which code word in many code words to confirm to compress.

22. method as claimed in claim 19; It is characterized in that; When said base station employing method one is confirmed the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression; If the CSI after the compression comprises CQI, then said base station confirms that this CQI calculates according to fixing PMI.

23. method as claimed in claim 22; It is characterized in that; Said fixing PMI is that said base station is through a pre-configured PMI of high-level signaling; Perhaps be a PMI who makes an appointment in said base station and said terminal, the said needs that perhaps report for said terminal the last time carry out the corresponding PMI of descending carrier of CSI compression.

24. method as claimed in claim 19 is characterized in that, before the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression is confirmed in said base station, further comprises:

A kind of method is chosen in said base station from said two kinds of methods, send to said terminal through high-level signaling;

Said base station confirms that the CSI number of bits of feedback that said needs carry out after the corresponding compression of the descending carrier of CSI compression comprises:

The method of choosing is adopted in said base station, confirms the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression.

25. method as claimed in claim 15 is characterized in that, the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression is confirmed in said base station, further comprises:

The CSI that CSI reporting types corresponding in said a plurality of descending carriers comprises the descending carrier of subband CQI is given up at the said terminal of said base station judges, according to the CSI number of bits of feedback of removing in said a plurality of descending carriers after descending carrier beyond the descending carrier that said CSI reporting types comprises subband CQI is confirmed compression.

26. like arbitrary described method among the claim 15-25, it is characterized in that, according to the CSI number of bits of feedback of said actual feedback, said terminal before the CSI of current sub-frame of uplink feedback decodes, further comprised in said base station:

If the needs at said terminal carry out the CSI number of bits of feedback sum of the descending carrier correspondence the descending carrier that need be in a plurality of descending carriers of current sub-frame of uplink feedback CSI carries out the CSI compression except that said needs at CSI number of bits of feedback and said terminal after the corresponding compression of the descending carrier of CSI compression; Surpass CSI transmission upper limit bit; Then said base station is according to the priority of each descending carrier in said a plurality of descending carriers and/or the priority of CSI reporting types; Judge that said terminal gives up the CSI of the part descending carrier in said a plurality of descending carriers; Make the total bit number of CSI of remaining descending carrier be no more than said CSI transmission upper limit bit; And, confirm as said terminal again in the CSI of current sub-frame of uplink actual feedback number of bits of feedback with the total number of bits of feedback of the CSI of remaining descending carrier;

Decode at the CSI of current sub-frame of uplink feedback to said terminal and comprise in said base station;

In the CSI of current sub-frame of uplink actual feedback number of bits of feedback, the CSI in current sub-frame of uplink feedback decodes to said terminal according to the said terminal of confirming again in said base station.

27., it is characterized in that said base station receives the CSI of said terminal feedback through Physical Uplink Control Channel PUCCH or Physical Uplink Shared Channel PUSCH like arbitrary described method among the claim 15-25.

28., it is characterized in that said CSI information comprises like arbitrary described method among the claim 15-25:

29. a terminal is characterized in that, this terminal comprises:

30. terminal as claimed in claim 29 is characterized in that, said determination module is used for:

31. terminal as claimed in claim 30 is characterized in that, said determination module is used for:

32. terminal as claimed in claim 31 is characterized in that, said bit number threshold value is 4 or 5.

33. terminal as claimed in claim 29 is characterized in that, said compression module is used for:

According to following method one or method two the CSI that said needs carry out the descending carrier of CSI compression is compressed:

34. terminal as claimed in claim 33 is characterized in that, said compression module also is used for:

When the CSI that carries out the descending carrier of CSI compression at a pair of said needs of employing method compressed, the many code word CQI corresponding to the said descending carrier of many codeword transmission compressed, and comprising:

35. terminal as claimed in claim 34 is characterized in that, said compression module is used for:

36. terminal as claimed in claim 33 is characterized in that, said compression module also is used for:

37. terminal as claimed in claim 36; It is characterized in that; Said fixing PMI is that a pre-configured PMI of high-level signaling is passed through in the base station; Perhaps be a PMI who makes an appointment in terminal and base station, the said needs that perhaps report for terminal the last time carry out the corresponding PMI of descending carrier of CSI compression.

38. terminal as claimed in claim 33 is characterized in that, said compression module also is used for:

39. terminal as claimed in claim 29 is characterized in that, said compression module also is used for:

40., it is characterized in that this terminal also comprises like arbitrary described terminal among the claim 29-39:

Give up module; The total CSI bit number that is used for the CSI after said needs carry out the corresponding compression of the descending carrier of CSI compression and need carries out the CSI of the descending carrier correspondence the descending carrier of CSI compression except that said needs at a plurality of descending carriers of current sub-frame of uplink feedback CSI; When surpassing CSI transmission upper limit bit; Priority according to the CSI reporting types of the priority of each descending carrier in said a plurality of descending carriers and/or each descending carrier; The CSI that need in current subframe, feed back part descending carrier in a plurality of descending carriers of CSI gives up, and makes the bit number of remaining CSI be no more than said CSI transmission upper limit bit;

Said feedback module is used for:

Carry out CSI at current sub-frame of uplink to base station feedback and give up the remaining CSI in back.

41., it is characterized in that said feedback module is used for like arbitrary described terminal among the claim 29-39:

Through Physical Uplink Control Channel PUCCH or Physical Uplink Shared Channel PUSCH to base station feedback CSI.

42., it is characterized in that said CSI information comprises like arbitrary described terminal among the claim 29-39:

43. a base station is characterized in that, this base station comprises:

44. base station as claimed in claim 43 is characterized in that, said carrier wave determination module is used for:

45. base station as claimed in claim 44 is characterized in that, said carrier wave determination module is used for:

46. base station as claimed in claim 45 is characterized in that, said bit number threshold value is 4 or 5.

47. base station as claimed in claim 43 is characterized in that, said bit number determination module is used for:

Confirm the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression according to following method one or method two:

48. base station as claimed in claim 47 is characterized in that, said bit number determination module also is used for:

When employing method one is confirmed the CSI number of bits of feedback after said needs carry out the corresponding compression of the descending carrier of CSI compression, confirm the CSI number of bits of feedback after the corresponding many code words CQI compression of the said descending carrier of many codeword transmission is comprised:

49. base station as claimed in claim 48 is characterized in that, said bit number determination module is used for:

50. base station as claimed in claim 47 is characterized in that, said bit number determination module is used for:

51. base station as claimed in claim 50; It is characterized in that; Said fixing PMI is that said base station is through a pre-configured PMI of high-level signaling; Perhaps be a PMI who makes an appointment in said base station and said terminal, the said needs that perhaps report for said terminal the last time carry out the corresponding PMI of descending carrier of CSI compression.

52. base station as claimed in claim 47 is characterized in that, said bit number determination module also is used for:

53. base station as claimed in claim 43 is characterized in that, said bit number determination module also is used for:

54., it is characterized in that this base station also comprises like arbitrary described base station among the claim 43-53:

Give up module; The CSI number of bits of feedback sum that is used for the descending carrier correspondence the descending carrier that need carry out the CSI compression except that said needs that needs at said terminal carry out CSI number of bits of feedback and said terminal after the corresponding compression of the descending carrier of CSI compression at a plurality of descending carriers of current sub-frame of uplink feedback CSI; When surpassing CSI transmission upper limit bit; According to the priority of each descending carrier in said a plurality of descending carriers and/or the priority of CSI reporting types; Judge that said terminal gives up the CSI of the part descending carrier in said a plurality of descending carriers; Make the total bit number of CSI of remaining descending carrier be no more than said CSI transmission upper limit bit, and, confirm as said terminal again in the CSI of current sub-frame of uplink actual feedback number of bits of feedback with the total number of bits of feedback of the CSI of remaining descending carrier;

Said receiver module is used for: said basis is given up the definite again said terminal of module in the CSI of current sub-frame of uplink actual feedback number of bits of feedback, and the CSI in current sub-frame of uplink feedback decodes to said terminal.

55. like arbitrary described base station among the claim 43-53, it is characterized in that said receiver module is used for: the CSI that receives said terminal feedback through Physical Uplink Control Channel PUCCH or Physical Uplink Shared Channel PUSCH.

56., it is characterized in that said CSI information comprises like arbitrary described base station among the claim 43-53: