Signalling in coordinated multi-point transmission and reception (CoMP)

1. A wireless communications method implemented in a first base station supporting coordinated multi-point transmission and reception (CoMP), the wireless communications method comprising:

receiving, from a second base station, for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, a plurality of CSI reports each of which comprises a rank indication (RI) and a channel quality indicator (CQI); and

performing resource allocation based on the RI and the CQI,

wherein

the second base station receives from one or more user equipments (UEs) RI and CQI information; and

the plurality of CSI reports are transmitted according to an information element (IE) comprising:

Semantics

IE/Group

reference

Name

Range

IE type and

description

CSI Report

1 . . .

per Cell

<maxUEReport>

>UE ID

BIT STRING

ID assigned by

(SIZE(16))

eNB2 for the UE.

>CSI Report

1 . . .

per CSI

<maxCS/Process>

Process item

>>CSI Process

Configuration

Index

>>CSI Report

1 . . .

per CSI

<maxCS/Report>

Process Item

>>>RI

INTEGER

The RI

(1 . . . 8, . . . )

corresponding to

the CQI being

reported for this

CSI process Item.

Value defined in

TS 36.213 [11].

>>>Wideband

9.2.bb

CQI

>>>Subband

ENUMERATED

Corresponds

Size

(2, 3, 4, 6, 8, . . . )

to a value

of subband

size k defined

in TS 36.213

[11] for the

system

bandwidth

N DL .

>>>Subband

0 . . .

CQI List

<maxSubband>

>>>>Subband

9.2.cc

If this IE is not

CQI

present, the CQI

is identical to the

one provided for

the last preceding

subband. This

IE is always

present for

the first subband

in the list.

>>>>Subband

INTEGER

Index

(0 . . . 27, . . . )

Range

Bound

Explanation

maxUEReport

maxSubband

maxCSIProcess

Maximum number of CSI processes

per UE. The value is 4.

maxCSIReport

Maximum number of CSI Reports

per CSI Process. The value is 2.

maxSubband

Maximum number of subbands. The

value is 14.

2. A wireless communications method implemented in a second base station supporting coordinated multi-point transmission and reception (CoMP), the wireless communications method comprising:

receiving from one or more user equipments (UEs) rank indication (RI) and channel quality indicator (CQI) information; and

transmitting, to a first base station, for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, a plurality of CSI reports each of which comprises an RI and a CQI,

wherein

the first base station performs resource allocation based on the RI and the CQI; and

the plurality of CSI reports are transmitted according to an information element (IE) comprising:

IE type and

Semantics

IE/Group Name

Range

reference

description

CSI Report per Cell

1 . . .

<maxUEReport>

>UE ID

BIT STRING

ID assigned by

(SIZE(16))

eNB2 for the UE.

>CSI Report per CSI

1 . . .

Process item

<maxCSIProcess>

>>CSI Process

Configuration Index

>>CSI Report per

1 . . .

CSI Process Item

<maxCSIReport>

>>>RI

INTEGER

The RI

(1 . . . 8, . . . )

corresponding to the

CQI being reported

for this CSI process

Item. Value defined

in TS 36.213 [11].

>>>Wideband CQI

9.2.bb

>>>Subband Size

ENUMERATED

Corresponds to a

(2, 3, 4, 6, 8, . . . )

value of subband

size k defined in TS

36.213 [11] for the

system bandwidth

N DL .

>>>Subband CQI

0 . . .

List

<maxSubband>

>>>>Subband

9.2.cc

If this IE is not

CQI

present, the CQI is

identical to the one

provided for the last

preceding subband.

This IE is always

present for the first

subband in the list.

>>>>Subband

INTEGER

Index

(0 . . . 27, . . . )

Range

Bound

Explanation

maxUEReport

maxSubband

maxCSIProcess

Maximum number of CSI processes

per UE. The value is 4.

maxCSIReport

Maximum number of CSI Reports

per CSI Process. The value is 2.

maxSubband

Maximum number of subbands. The

value is 14.

3. The wireless communications method as in claim 2 ,

wherein the number of the plurality of CSI reports is up to 2.

4. The wireless communications method as in claim 2 ,

wherein each of the RI and the CQI can be different for the plurality of CSI reports.

5. The wireless communications method as in claim 2 ,

wherein, for each CSI report, the RI corresponds to the CQI being reported.

6. The wireless communications method as in claim 2 ,

wherein, in each CSI report, the RI and the CQI are mutually consistent.

7. The wireless communications method as in claim 2 ,

wherein each of the plurality of CSI reports further comprises a subband index.

8. The wireless communications method as in claim 7 ,

wherein a maximum number of subbands is 14 and the subband index takes an integer of 0 to 27.

9. The wireless communications method as in claim 2 ,

wherein the plurality of CSI reports further comprises a subband CQI consisting of 4-bits for codeword 1.

10. A first base station supporting coordinated multi-point transmission and reception (CoMP) and used in a wireless communications system, the first base station comprising:

a receiver to receive from a second base station, for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, a plurality of CSI reports each of which comprises a rank indication (RI) and a channel quality indicator (CQI); and

a controller to perform resource allocation based on the RI and the CQI,

wherein

the second base station receives from one or more user equipments (UEs) RI and CQI information; and

the plurality of CSI reports are transmitted according to an information element (IE) comprising:

Semantics

reference

IE/Group Name

Range

IE type and

description

CSI Report per Cell

1 . . .

<maxUE-

Report>

>UE ID

BIT STRING

ID assigned by

(SIZE(16))

eNB2 for the UE.

>CSI Report per CSI

1 . . .

Process item

<maxCS/

Process>

>>CSI Process

Configuration Index

>>CSI Report per

1 . . .

CSI Process Item

<maxCS/

Report>

>>>RI

INTEGER

The RI

The RI

corresponding to the

(1 . . . 8, . . .)

CQI being reported

for this CSI process

Item. Value defined

in TS 36.213 [11].

>>>Wideband CQI

9.2.bb

>>>Subband Size

ENUMER-

Corresponds to a

ATED

value of subband

(2, 3, 4,

size k defined in TS

6, 8, . . .)

36.213 [11] for the

system bandwidth

N RB DL .

>>>Subband CQI

0 . . .

List

<max-

Subband>

>>>>Subband

9.2.cc

If this IE is not

CQI

present, the CQI is

identical to the one

provided for the last

preceding subband.

This IE is always

present for the first

subband in the list.

>>>>Subband

INTEGER

Index

(0 . . . 27, . . .)

Range Bound

Explanation

maxUEReport

maxSubband

maxCSIProcess

Maximum number of CSI processes per

UE. The value is 4.

maxCSIReport

Maximum number of CSI Reports per CSI

Process. The value is 2.

maxSubband

Maximum number of subbands. The value

is 14.

11. A second base station supporting coordinated multi-point transmission and reception (CoMP) and used in a wireless communications system, the second base station comprising:

a receiver to receive from one or more user equipments (UEs) rank indication (RI) and channel quality indicator (CQI) information; and

a transmitter to transmit to a first base station, for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, a plurality of CSI reports each of which comprises an RI and a CQI,

wherein

the first station performs resource allocation based on the RI and the CQI; and

the plurality of CSI reports are transmitted according to an information element (IE) comprising:

Semantics

reference

IE/Group Name

Range

IE type and

description

CSI Report per Cell

1 . . .

<maxUE-

Report>

>UE ID

BIT STRING

ID assigned by

(SIZE(16))

eNB2 for the UE.

>CSI Report per CSI

1 . . .

Process item

<maxCS/

Process>

>>CSI Process

Configuration Index

>>CSI Report per

1 . . .

CSI Process Item

<maxCS/

Report>

>>>RI

INTEGER

The RI

The RI

corresponding to the

(1 . . . 8, . . .)

CQI being reported

for this CSI process

Item. Value defined

in TS 36.213 [11].

>>>Wideband CQI

9.2.bb

>>>Subband Size

ENUMER-

Corresponds to a

ATED

value of subband

(2, 3, 4,

size k defined in TS

6, 8, . . .)

36.213 [11] for the

system bandwidth

N RB DL .

>>>Subband CQI

0 . . .

List

<max-

Subband>

>>>>Subband

9.2.cc

If this IE is not

CQI

present, the CQI is

identical to the one

provided for the last

preceding subband.

This IE is always

present for the first

subband in the list.

>>>>Subband

INTEGER

Index

(0 . . . 27, . . .)

Range Bound

Explanation

maxUEReport

maxSubband

maxCSIProcess

Maximum number of CSI processes per

UE. The value is 4.

maxCSIReport

Maximum number of CSI Reports per CSI

Process. The value is 2.

maxSubband

Maximum number of subbands. The value

is 14.

12. The second base station as in claim 11 ,

wherein the number of the plurality of CSI reports is up to 2.

13. The second base station as in claim 11 ,

wherein each of the RI and the CQI can be different for the plurality of CSI reports.

14. The second base station as in claim 11 ,

wherein, for each CSI report, the RI corresponds to the CQI being reported.

15. The second base station as in claim 11 ,

wherein, in each CSI report, the RI and the CQI are mutually consistent.

16. The second base station as in claim 11 ,

wherein each of the plurality of CSI reports further comprises a subband index.

17. The second base station as in claim 16 ,

wherein a maximum number of subbands is 14 and the subband index takes an integer of 0 to 27.

18. The second base station as in claim 11 ,

wherein the plurality of CSI reports further comprises a subband CQI consisting of 4-bits for codeword 1.

19. A wireless communications method implemented in a wireless communications system supporting coordinated multi-point transmission and reception (CoMP) and including a first base station and a second base station, the wireless communications method comprising:

transmitting from one or more user equipments (UEs) to the second base station rank indication (RI) and channel quality indicator (CQI) information;

for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, transmitting from the second base station to the first base station a plurality of CSI reports each of which comprises an RI and a CQI; and

performing resource allocation based on the RI and the CQI,

wherein the plurality of CSI reports are transmitted according to an information element (IE) comprising:

Semantics

reference

IE/Group Name

Range

IE type and

description

CSI Report per Cell

1 . . .

<maxUE-

Report>

>UE ID

BIT STRING

ID assigned by

(SIZE(16))

eNB2 for the UE.

>CSI Report per CSI

1 . . .

Process item

<maxCS/

Process>

>>CSI Process

Configuration Index

>>CSI Report per

1 . . .

CSI Process Item

<maxCS/

Report>

>>>RI

INTEGER

The RI

The RI

corresponding to the

(1 . . . 8, . . .)

CQI being reported

for this CSI process

Item. Value defined

in TS 36.213 [11].

>>>Wideband CQI

9.2.bb

>>>Subband Size

ENUMER-

Corresponds to a

ATED

value of subband

(2, 3, 4,

size k defined in TS

6, 8, . . .)

36.213 [11] for the

system bandwidth

N RB DL .

>>>Subband CQI

0 . . .

List

<max-

Subband>

>>>>Subband

9.2.cc

If this IE is not

CQI

present, the CQI is

identical to the one

provided for the last

preceding subband.

This IE is always

present for the first

subband in the list.

>>>>Subband

INTEGER

Index

(0 . . . 27, . . .)

Range Bound

Explanation

maxUEReport

maxSubband

maxCSIProcess

Maximum number of CSI processes per

UE. The value is 4.

maxCSIReport

Maximum number of CSI Reports per CSI

Process. The value is 2.

maxSubband

Maximum number of subbands. The value

is 14.

20. A wireless communications system supporting coordinated multi-point transmission and reception (CoMP), the wireless communications system comprising:

a first base station;

a second base station transmitting to the first base station, for a given user equipment (UE) identification (ID) and a given channel state information (CSI) process, a plurality of CSI reports each of which comprises a rank indication (RI) and a channel quality indicator (CQI); and

one or more user equipments (UEs) transmitting to the second base station RI and CQI information,

wherein

the first base station performing resource allocation based on the RI and the CQI; and

the plurality of CSI reports are transmitted according to an information element (IE) comprising:

IE type and

Semantics

IE/Group Name

Range

reference

description

CSI Report per Cell

1 . . .

<maxUE-

Report>

>UE ID

BIT STRING

ID assigned by

(SIZE(16))

eNB2 for the UE.

>CSI Report per CSI

1 . . .

Process item

<maxCS/

Process>

>>CSI Process

Configuration Index

>>CSI Report per

1 . . .

CSI Process Item

<maxCS/

Report>

>>>RI

INTEGER

The RI

The RI

corresponding to the

(1 . . . 8, . . .)

CQI being reported

for this CSI process

Item. Value defined

in TS 36.213 [11].

>>>Wideband CQI

9.2.bb

>>>Subband Size

ENUMER-

Corresponds to a

ATED

value of subband

(2, 3, 4,

size k defined in TS

6, 8, . . .)

36.213 [11] for the

system bandwidth

N RB DL .

>>>Subband CQI

0 . . .

List

<max-

Subband>

>>>>Subband

9.2.cc

If this IE is not

CQI

present, the CQI is

identical to the one

provided for the last

preceding subband.

This IE is always

present for the first

subband in the list.

>>>>Subband

INTEGER

Index

(0 . . . 27, . . .)

Range Bound

Explanation

maxUEReport

maxSubband

maxCSIProcess

Maximum number of CSI processes per

UE. The value is 4.

maxCSIReport

Maximum number of CSI Reports per CSI

Process. The value is 2.

maxSubband

Maximum number of subbands. The value

is 14.