9.3.4 UE-selected subband CQI

36.1013GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Release 18TSUser Equipment (UE) radio transmission and reception

The accuracy of UE-selected subband channel quality indicator (CQI) reporting under frequency-selective fading conditions is determined by the relative increase of the throughput obtained when transmitting on the UE-selected subbands with the corresponding transport format compared to the case for which a fixed format is transmitted on any subband in set S of TS 36.213 [6]. The purpose is to verify that correct subbands are accurately reported for frequency-selective scheduling. To account for sensitivity of the input SNR the subband CQI reporting under frequency-selective fading conditions is considered to be verified if the reporting accuracy is met for at least one of two SNR levels separated by an offset of 1 dB.

9.3.4.1 Minimum requirement PUSCH 2-0 (Cell-Specific Reference Symbols)

9.3.4.1.1 FDD

For the parameters specified in Table 9.3.4.1.1-1, and using the downlink physical channels specified in Annex C.3.2, the minimum requirements are specified in Table 9.3.4.1.1-2 and by the following

a) the ratio of the throughput obtained when transmitting on a randomly selected subband among the best M subbands reported by the UE the corresponding TBS and that obtained when transmitting the TBS indicated by the reported wideband CQI median on a randomly selected subband in set S shall be ≥ ;

The requirements only apply for subbands of full size and the random scheduling across the subbands is done by selecting a new subband in each TTI for FDD. The transport block size TBS (wideband CQI median) is that resulting from the code rate which is closest to that indicated by the wideband CQI median and theentry in Table 7.1.7.2.1-1 of TS 36.213 [6] that corresponds to the subband size.

Table 9.3.4.1.1-1 Subband test for single antenna transmission (FDD)

Parameter

Unit

Test 1

Test 2

Bandwidth

MHz

10 MHz

Transmission mode

1 (port 0)

Downlink power allocation

dB

0

dB

0

σ

dB

0

SNR (Note 3)

dB

9

10

14

15

dB[mW/15kHz]

-89

-88

-84

-83

dB[mW/15kHz]

-98

-98

Propagation channel

Clause B.2.4 with s, a = 1, Hz

Reporting interval

ms

5

CQI delay

ms

8

Reporting mode

PUSCH 2-0

Max number of HARQ transmissions

1

Subband size (k)

RBs

3 (full size)

Number of preferred subbands (M)

5

Note 1: If the UE reports in an available uplink reporting instance at subframe SF#n based on CQI estimation at a downlink subframe not later than SF#(n-4), this reported subband or wideband CQI cannot be applied at the eNB downlink before SF#(n+4)

Note 2: Reference measurement channel RC.5 FDD according to Table A.4-1 with one/two sided dynamic OCNG Pattern OP.1/2 FDD as described in Annex A.5.1.1/2.

Note 3: For each test, the minimum requirements shall be fulfilled for at least one of the two SNR(s) and the respective wanted signal input level.

Table 9.3.4.1.1-2 Minimum requirement (FDD)

Test 1

Test 2

1.2

1.2

UE Category

≥1

≥1
9.3.4.1.2 TDD

For the parameters specified in Table 9.3.4.1.2-1, and using the downlink physical channels specified in Annex C.3.2, the minimum requirements are specified in Table 9.3.4.1.2-2 and by the following

a) the ratio of the throughput obtained when transmitting on a randomly selected subband among the best M subbands reported by the UE the corresponding TBS and that obtained when transmitting the TBS indicated by the reported wideband CQI median on a randomly selected subband in set S shall be ≥ ;

The requirements only apply for subbands of full size and the random scheduling across the subbands is done by selecting a new subband in each available downlink transmission instance for TDD. The transport block size TBS (wideband CQI median) is that resulting from the code rate which is closest to that indicated by the wideband CQI median and theentry in Table 7.1.7.2.1-1 of TS 36.213 [6] that corresponds to the subband size.

Table 9.3.4.1.2-1 Sub-band test for single antenna transmission (TDD)

Parameter

Unit

Test 1

Test 2

Bandwidth

MHz

10 MHz

Transmission mode

1 (port 0)

Downlink power allocation

dB

0

dB

0

σ

dB

0

Uplink downlink configuration

2

Special subframe configuration

4

SNR (Note 3)

dB

9

10

14

15

dB[mW/15kHz]

-89

-88

-84

-83

dB[mW/15kHz]

-98

-98

Propagation channel

Clause B.2.4 with s, a = 1, Hz

Reporting interval

ms

5

CQI delay

ms

10 or 11

Reporting mode

PUSCH 2-0

Max number of HARQ transmissions

1

Subband size (k)

RBs

3 (full size)

Number of preferred subbands (M)

5

ACK/NACK feedback mode

Multiplexing

Note 1: If the UE reports in an available uplink reporting instance at subframe SF#n based on CQI estimation at a downlink subframe not later than SF#(n-4), this reported subband or wideband CQI cannot be applied at the eNB downlink before SF#(n+4)

Note 2: Reference measurement channel RC.5 TDD according to Table A.4-1 with one/two sided dynamic OCNG Pattern OP.1/2 TDD as described in Annex A.5.2.1/2.

Note 3: For each test, the minimum requirements shall be fulfilled for at least one of the two SNR(s) and the respective wanted signal input level.

Table 9.3.4.1.2-2 Minimum requirement (TDD)

Test 1

Test 2

1.2

1.2

UE Category

≥1

≥1

9.3.4.2 Minimum requirement PUCCH 2-0 (Cell-Specific Reference Symbols)

9.3.4.2.1 FDD

For the parameters specified in Table 9.3.4.2.1-1, and using the downlink physical channels specified in Annex C.3.2, the minimum requirements are specified in Table 9.3.4.2.1-2 and by the following

a) the ratio of the throughput obtained when transmitting on subbands reported by the UE the corresponding TBS and that obtained when transmitting the TBS indicated by the reported wideband CQI median on a randomly selected subband in set S shall be ≥ ;

The requirements only apply for subbands of full size and the random scheduling across the subbands is done by selecting a new subband in each TTI for FDD. The transport block size TBS (wideband CQI median) is that resulting from the code rate which is closest to that indicated by the wideband CQI median and theentry in Table 7.1.7.2.1-1 of TS 36.213 [6] that corresponds to the subband size.

Table 9.3.4.2.1-1 Subband test for single antenna transmission (FDD)

Parameter

Unit

Test 1

Test 2

Bandwidth

MHz

10 MHz

Transmission mode

1 (port 0)

Downlink power allocation

dB

0

dB

0

σ

dB

0

SNR (Note 3)

dB

8

9

13

14

dB[mW/15kHz]

-90

-89

-85

-84

dB[mW/15kHz]

-98

-98

Propagation channel

Clause B.2.4 with s, a = 1, Hz

Reporting periodicity

ms

NP = 2

CQI delay

ms

8

Physical channel for CQI reporting

PUSCH (Note 4)

PUCCH Report Type for wideband CQI

4

PUCCH Report Type for subband CQI

1

Max number of HARQ transmissions

1

Subband size (k)

RBs

6 (full size)

Number of bandwidth parts (J)

3

K

1

cqi-pmi-ConfigIndex

1

Note 1: If the UE reports in an available uplink reporting instance at subframe SF#n based on CQI estimation at a downlink subframe not later than SF#(n-4), this reported subband or wideband CQI cannot be applied at the eNB downlink before SF#(n+4)

Note 2: Reference measurement channel RC.3 FDD according to Table A.4-1 with one/two sided dynamic OCNG Pattern OP.1/2 FDD as described in Annex A.5.1.1/2.

Note 3: For each test, the minimum requirements shall be fulfilled for at least one of the two SNR(s) and the respective wanted signal input level.

Note 4: To avoid collisions between CQI reports and HARQ-ACK it is necessary to report both on PUSCH instead of PUCCH. PDCCH DCI format 0 shall be transmitted in downlink SF#1, #3, #7 and #9 to allow periodic CQI to multiplex with the HARQ-ACK on PUSCH in uplink subframe SF#5, #7, #1 and #3.

Note 5: CQI reports for the short subband (having 2RBs in the last bandwidth part) are to be disregarded and data scheduling according to the most recent subband CQI report for bandwidth part with j=1.

Note 6: In the case where wideband CQI is reported, data is to be scheduled according to the most recently used subband CQI report.

Table 9.3.4.2.1-2 Minimum requirement (FDD)

Test 1

Test 2

1.15

1.15

UE Category

≥1

≥1
9.3.4.2.2 TDD

For the parameters specified in Table 9.3.4.2.2-1, and using the downlink physical channels specified in Annex C.3.2, the minimum requirements are specified in Table 9.3.4.2.2-2 and by the following

a) the ratio of the throughput obtained when transmitting on subbands reported by the UE the corresponding TBS and that obtained when transmitting the TBS indicated by the reported wideband CQI median on a randomly selected subband in set S shall be ≥ ;

The requirements only apply for subbands of full size and the random scheduling across the subbands is done by selecting a new subband in each available downlink transmission instance for TDD. The transport block size TBS (wideband CQI median) is that resulting from the code rate which is closest to that indicated by the wideband CQI median and theentry in Table 7.1.7.2.1-1 of TS 36.213 [6] that corresponds to the subband size.

Table 9.3.4.2.2-1 Sub-band test for single antenna transmission (TDD)

Parameter

Unit

Test 1

Test 2

Bandwidth

MHz

10 MHz

Transmission mode

1 (port 0)

Downlink power allocation

dB

0

dB

0

σ

dB

0

Uplink downlink configuration

2

Special subframe configuration

4

SNR (Note 3)

dB

8

9

13

14

dB[mW/15kHz]

-90

-89

-85

-84

dB[mW/15kHz]

-98

-98

Propagation channel

Clause B.2.4 with s, a = 1, Hz

Reporting periodicity

ms

NP = 5

CQI delay

ms

10 or 11

Physical channel for CQI reporting

PUSCH (Note 4)

PUCCH Report Type for wideband CQI

4

PUCCH Report Type for subband CQI

1

Max number of HARQ transmissions

1

Subband size (k)

RBs

6 (full size)

Number of bandwidth parts (J)

3

K

1

cqi-pmi-ConfigIndex

3

ACK/NACK feedback mode

Multiplexing

Note 1: If the UE reports in an available uplink reporting instance at subframe SF#n based on CQI estimation at a downlink subframe not later than SF#(n-4), this reported subband or wideband CQI cannot be applied at the eNB downlink before SF#(n+4).

Note 2: Reference measurement channel RC.3 TDD according to Table A.4-1 with one/two sided dynamic OCNG Pattern OP.1/2 TDD as described in Annex A.5.2.1/2.

Note 3: For each test, the minimum requirements shall be fulfilled for at least one of the two SNR(s) and the respective wanted signal input level.

Note 4: To avoid collisions between CQI reports and HARQ-ACK it is necessary to report both on PUSCH instead of PUCCH. PDCCH DCI format 0 shall be transmitted in downlink SF#3 and #8 to allow periodic CQI to multiplex with the HARQ-ACK on PUSCH in uplink subframe SF#7 and #2.

Note 5: CQI reports for the short subband (having 2RBs in the last bandwidth part) are to be disregarded and data scheduling according to the most recent subband CQI report for bandwidth part with j=1.

Note 6: In the case where wideband CQI is reported, data is to be scheduled according to the most recently used subband CQI report.

Table 9.3.4.2.2-2 Minimum requirement (TDD)

Test 1

Test 2

1.15

1.15

UE Category

≥1

≥1