Method and device for reporting channel state information

1. A method of reporting channel state information is characterized in that which comprises:

User terminal selects the codebook used during PMI (precoding matrix indication) reporting from a second-stage codebook, and selects PMI from this codebook; said double-stage codebook includes the codebook reflecting long-termlbroadband information and the codebook reflecting short-term/ selective channel frequency information;

Said user terminal determines the parameter used during CQI (channel quality indication) calculation and calculates CQI based on this parameter; the determined parameter used during CQI calculation through PUCCH reporting involves PMI reported by said user terminal through PUSCH; during reporting through PUSCH, the determined parameter used for CQI calculation includes PMI reported by said user terminal through PUCCH;

Said user terminal reports rank indication (RI), the selected PMI and calculated CQI according to the specified reporting mode.

2. The method as claimed in claim 1 , wherein, during reporting through PUCCH, codebook selected by said user terminal refers to that reflecting long-term/broadband information and the selected PMI is that corresponding to precoding matrix applicable to wide band;

And/or, during reporting through PUSCH, codebook selected by said user terminal refers to that reflecting short-term / frequency selective channel information and the selected PMI includes the PMI corresponding to precoding matrix selected for reporting cell of each frequency domain subset.

3. The method as claimed in claim 2 , wherein, before selecting codebook, it also includes: said user terminal judges whether said RI exceeds the set threshold R T ;

When reporting through PUCCH, said user terminal selects the codebook used in reporting PMI from double-stage codebook and selects PMI from the codebook, comprising:

If said RI fails to exceed R T , select the codebook reflecting long-term / broadband information and the PMI corresponding to precoding matrix applicable to wide band from the codebook;

If said RI does exceed R T , select the codebook reflecting short-term/frequency selective channel information and the PMI corresponding to precoding matrix applicable to wide band from the codebook;

And/or,

When reporting through PUSCH, if said RI fails to exceed the set threshold R T , the dimensionality of the selected precoding matrix is Rt×RI; if it does, the dimensionality of the selected precoding matrix is N T ×RI, wherein, N T refers to the number of transmitting antenna of eNB.

4. The method as claimed in claim 3 , wherein, if said RI fails to exceed R T , the dimensionality of the selected precoding matrix is N r ×R T , wherein N T refers to the number of transmitting antenna of eNB.

5. The method as claimed in claim 3 , wherein, if said RI exceeds R T , the dimensionality of the selected precoding matrix is N T ×RI ; wherein N T refers to the number of transmitting antenna of eNB.

6. The method as claimed in claim 1 , wherein, before determining the parameter used in calculating CQI, it also includes: said user terminal judges whether said RI exceeds the set threshold R T ;

When reporting through PUCCH, said user terminal determines the parameter used in calculating CQI, comprising:

If said RI fails to exceed R T , the parameters used in calculating CQI include: said RI, PMI selected by said user terminal and PMI reported by said user terminal through PUSCH;

If said RI exceeds R T , the parameters used in calculating CQI include: said RI, PMI selected by said user terminal and a fixed parameter; the parameter refers to N T ×N T , wherein N T means the number of transmitting antenna of eNB;

And/or,

When reporting through PUSCH, said user terminal determines the parameter used in calculating CQI, comprising:

If said RI fails to exceed R T , the parameters used in calculating CQI include: said RI, PMI selected by said user terminal and PMI reported by said user terminal through PUCCH;

If said RI exceeds R T , the parameters used in calculating CQI include: said RI, PMI selected by said user terminal and a fixed parameter; the parameter refers to N T ×N T , wherein N T means the number of transmitting antenna of eNB.

7. A user terminal device, including:

PMI selected cell, which is used to select the codebook used during PMI reported from a second-stage codebook, and select PMI from this codebook; said second-stage codebook includes the codebook displaying long-term/broadband information and the codebook displaying short-term/selective channel frequency information;

CQI calculation cell, which is used to determine the parameter during CQI calculation and calculate CQI based on this parameter; the determined parameter used during CQI calculation through PUCCH reporting involves PMI reported by said user terminal through PUSCH; during reporting through PUSCH, the determined parameter used for CQI calculation includes PMI reported by said user terminal through PUCCH;

Reporting cell, which is used to report RI, PMI selected by said PMI selected cell and CQI calculated by said CQI calculation cell based on the specified reporting mode.

8. The user terminal device as claimed in claim 7 , wherein, when reporting through PUCCH, said PMI selected cell is applied to select the codebook reflecting long-term/broadband information and the PMI corresponding to precoding matrix applicable to wide band from the selected codebook; and/or, when reporting through PUSCH, select the codebook reflecting short-term/frequency selective channel information, and the PMI corresponding to precoding matrix for reporting cell of each frequency domain subset from the codebook.

9. The user terminal device as claimed in claim 8 , wherein, said PMI selected cell is applied to judge whether RI exceeds the set threshold R T when reporting through PUCCH; if not, select the codebook reflecting long-term/broadband information and the PMI corresponding to precoding matrix applicable to wide band from the codebook; if does, select the codebook reflecting short-term/frequency selective channel information, and the PMI corresponding to precoding matrix applicable to wide band from the codebook; and/or, when reporting through PUSCH, if said RI fails to exceed the set threshold Rt, the dimensionality of the selected precoding matrix is Rt×RI; if said exceeds the set threshold Rt, the dimensionality of selected precoding matrix is N r ×RI, wherein N r refers to the number of transmitting antenna of eNB.

10. The user terminal device as claimed in claim 9 , wherein, said PMI selected cell is applied to select the precoding matrix with dimensionality of N r ×R T when RI fails to exceed R T , therein, N T refers to the number of transmitting antenna of eNB.

11. The user terminal device as claimed in claim 9 , wherein, said PMI selected cell is applied to select the precoding matrix with dimensionality of N T ×RI when RI exceeds R T , therein, N T refers to the number of transmitting antenna of eNB.

12. The user terminal device as claimed in claim 7 , wherein, said CQI calculation cell is applicable to judge whether said RI exceeds the set threshold R T ;

When reporting through PUCCH, if said RI fails to exceed R T , the parameters used in calculating CQI include: said RI, PMI selected by said user terminal and PMI reported by said user terminal through PUSCH; if does, the parameters used in calculating CQI include: said RI, PMI selected by said user terminal and a fixed parameter; the parameter refers to N T ×N T , wherein N T means the number of transmitting antenna of eNB;

And/or,

When reporting through PUSCH, if said RI fails to exceed R T , the parameters used in calculating CQI include: said RI, PMI selected by said user terminal and PMI reported by said user terminal through PUCCH; if does, the parameters used in calculating CQI include: said RI, PMI selected by said user terminal and a fixed parameter; the parameter refers to N T ×N T , wherein N T means the number of transmitting antenna of eNB.