METHOD AND APPARATUS FOR CALCULATING CHANNEL QUALITY INFORMATION AND COMMUNICATION SYSTEM

1 . An apparatus for determining channel quality information, applicable to a terminal equipment, the apparatus comprising:

a receiver configured to receive first channel state information reference signal (CSIRS) resource configuration from a network device, the first CSIRS resource configuration at least comprising a first resource set having K CSIRS resources, K being a natural number greater than or equal to 2; and

a processor circuitry configured to determine a channel quality indicator (CQI) at least based on M CSIRS resources, the M CSIRS resources being related with K CSIRS resources, and M being a natural number less than or equal to K,

wherein the determination of the CQI is at least based on an first physical downlink shared channel (PDSCH), the first PDSCH being transmitted at antenna ports [1000, . . . , 1000+v−1], the first PDSCH being related to corresponding symbols transmitted on antenna ports [3000, . . . , 3000+P−1], wherein a relationship between the first PDSCH and the corresponding symbols is

[

Y

0

(

i

)

…

Y

M

-

1

(

i

)

]

=

W

⁡

(

i

)

[

x

(

0

)

(

i

)

…

x

(

v

-

1

)

(

i

)

]

;

where, x(i)=[x (0) (i) . . . x (v−1) (i)] T denotes signal vectors of v layers of the first PDSCH,

Y

k

⁢

_

⁢

j

(

i

)

=

[

y

j

(

3000

)

(

i

)

…

y

j

(

3000

+

P

-

1

)

(

i

)

]

are signals transmitted at the antenna ports [3000, . . . , 3000+P−1], where 0<=j<=M−1 and are related to a (j+1)-th CSIRS signal within the M selected resources, and

W

⁡

(

i

)

=

[

w

(

0

)

(

i

)

…

w

(

M

-

1

)

(

i

)

]

is a precoding matrix obtained by applying a PMI reported based on the M CSI-RS resources to x(i).

2 . The apparatus according to claim 1 , wherein,

the processor circuitry determines a selection result of the M CSIRS resources according to a bitmap with K bits, and the selection result is reported by a first transmitter.

3 . The apparatus according to claim 1 , wherein,

the terminal equipment performs transmission completely overlapped in a time domain and a frequency domain at the antenna ports [3000, . . . , 3000+P−1] based on the M CSIRS resources and/or the K CSIRS resources;

where, P is the number of antenna ports of each CSIRS resource.

4 . A communication system, comprising a network device and a terminal equipment, wherein the terminal equipment comprising the apparatus for determining channel quality information as claimed in claim 1 .

5 . A method for determining channel quality information, applicable to a terminal equipment, the method comprising:

receiving, by the terminal equipment, first channel state information reference signal (CSIRS) resource configuration from a network device, the first CSIRS resource configuration at least comprising a first resource set having K CSIRS resources, K being a natural number greater than or equal to 2; and

determining a channel quality indicator (CQI) by the terminal equipment at least based on M CSIRS resources, the M CSIRS resources being related with K CSIRS resources, and M being a natural number less than or equal to K,

wherein the determination of the CQI is at least based on an first physical downlink shared channel (PDSCH), the first PDSCH being transmitted at antenna ports [1000, . . . , 1000+v−1], the first PDSCH being related to corresponding symbols transmitted on antenna ports [3000, . . . , 3000+P−1].

6 . The method according to claim 5 , wherein a relationship between the first PDSCH and the corresponding symbol is

[

Y

0

(

i

)

…

Y

M

-

1

(

i

)

]

=

W

⁡

(

i

)

[

x

(

0

)

(

i

)

…

x

(

v

-

1

)

(

i

)

]

;

where, x(i)=[x (0) (i) . . . x (v−1) (i)] T denotes signal vectors of v layers of the first PDSCH,

Y

k

⁢

_

⁢

j

(

i

)

=

[

y

j

(

3000

)

(

i

)

…

y

j

(

3000

+

P

-

1

)

(

i

)

]

are signals transmitted at the antenna ports [3000, . . . , 3000+P−1], where 0<=j<=M−1 which are related to a (j+1)-th CSIRS signal within the M selected resources, and

W

⁡

(

i

)

=

[

w

(

0

)

(

i

)

…

w

(

M

-

1

)

(

i

)

]

is a precoding matrix obtained by applying a PMI reported based on the M CSIRS resources to x(i).

7 . The method according to claim 5 , wherein,

the terminal equipment determines a selection result of the M CSIRS resources according to a bitmap with K bits, and reports the selection result.

8 . The method according to claim 5 , wherein,

the terminal equipment performs transmission completely overlapped in a time domain and a frequency domain at the antenna ports [3000, . . . , 3000+P−1] based on the M CSIRS resources and/or the K CSIRS resources;

where, P is the number of antenna ports of each CSIRS resource.

9 . The method according to claim 6 , wherein,

the terminal equipment performs transmission completely overlapped in a time domain and a frequency domain at the antenna ports [3000, . . . , 3000+P−1] based on the M CSIRS resources and/or the K CSIRS resources;

where, P is the number of antenna ports of each CSIRS resource.

10 . The method according to claim 6 , wherein,

the terminal equipment performs transmission completely overlapped in a time domain and a frequency domain at the antenna ports [3000, . . . , 3000+P−1] based on the M CSIRS resources and/or the K CSIRS resources;

where, P is the number of antenna ports of each CSIRS resource.