9.12 CSI reporting (UE supporting Short TTI)

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

The requirements in this sub-clause are valid for UEs capable of short TTI.

9.12.1 CQI reporting under fading conditions (Cell-Specific Reference Symbol)

The reporting accuracy of the channel quality indicator (CQI) under frequency non-selective fading conditions is determined by the reporting variance, and the relative increase of the throughput obtained when the transport format transmitted is that indicated by the reported CQI compared to the case for which a fixed transport format configured according to the reported median CQI is transmitted. In addition, the reporting accuracy is determined by a minimum BLER using the transport formats indicated by the reported CQI. The purpose is to verify that the UE is tracking the channel variations and selecting the largest transport format possible according to the prevailing channel state for frequently non-selective scheduling. To account for sensitivity of the input SNR the CQI reporting under frequency non-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.

9.12.1.1 FDD

For the parameters specified in Table 9.12.1.1-1, Table 9.12.1.1-2 and Table 9.12.1.1-3 using the downlink physical channels specified in Annex C.3.2, the minimum requirements are specified in Table 9.12.1.1-4 by the following

a) a CQI index not in the set {median CQI -1, median CQI, median CQI +1} shall be reported at least % of the time;

b) the ratio of the throughput obtained when transmitting the transport format indicated by each reported wideband CQI index and that obtained when transmitting a fixed transport format configured according to the wideband CQI median shall be ≥ ;

c) when transmitting the transport format indicated by each reported wideband CQI index, the average BLER for the indicated transport formats shall be greater or equal to 0.02.

Table 9.12.1.1-1: Fading test for slot-PDSCH (FDD)

Parameter

Unit

Test 1

Test 2

Bandwidth

MHz

10 MHz

Transmission mode

4 (ports 0 and 1)

Downlink power allocation

dB

-3

dB

-3

σ

dB

0

SNR (Note 3)

dB

1

2

9

10

dB[mW/15kHz]

-97

-96

-89

-88

dB[mW/15kHz]

-98

-98

Propagation channel

EPA5

Correlation and antenna configuration

High (2 x 2)

Reporting mode

PUSCH 1-1

Reporting interval

ms

5

CQI delay

slots

8

Max number of HARQ transmissions

1

CodeBookSubsetRestriction bitmap

00 0001

DL TTI length

Slot

Configured SPDCCH-PRB sets

{Set 1}

SPDCCH-PRB set used for DCI transmission

Set 1

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

Note 2: Reference measurement channel RC.26 FDD according to Table A.4-1 for Categories 2 or higher with one sided dynamic OCNG Pattern OP.1 FDD as described in Annex A.5.1.1.

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 9.12.1.1-2: Fading test for subslot-PDSCH (FDD)

Parameter

Unit

Test 3

Test 4

Bandwidth

MHz

10 MHz

Transmission mode

4 (ports 0 and 1)

Downlink power allocation

dB

-3

dB

-3

σ

dB

0

SNR (Note 3)

dB

1

2

9

10

dB[mW/15kHz]

-97

-96

-89

-88

dB[mW/15kHz]

-98

-98

Propagation channel

EPA5

Correlation and antenna configuration

High (2 x 2)

Reporting mode

PUSCH 1-1

Reporting interval

ms

5

CQI delay

subslots

8 or 12 (Note 1)

Max number of HARQ transmissions

1

CodeBookSubsetRestriction bitmap

00 0001

DL TTI length

Subslot

Configured SPDCCH-PRB sets

{Set 1}

SPDCCH-PRB set used for DCI transmission

Set 1

Note 1: If the UE reports in an available uplink reporting instance at subslot #n based on CQI estimation at a downlink slot not later than subslot #(n-k), this reported wideband CQI cannot be applied at the eNB downlink before subslot #(n+k), where k = 4 for UE capability ProcessingTimelineSet=set1 and k=6 for UE capability ProcessingTimelineSet=set2.

Note 2: Reference measurement channel RC.28 FDD according to Table A.4-1 for Categories 2 or higher with one sided dynamic OCNG Pattern OP.1 FDD as described in Annex A.5.1.1.

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 9.12.1.1-3: SPDCCH parameters (FDD)

Parameter

Unit

Set 1

Refence symbol

CRS

Number of PRB per SPDCCH-PRB set

16

Transmission type

Localized

Number of OFDM symbols

1

Number of PRBs per SPDCCH-PRB set (Note 1)

16

Rate Matching mode

Mode 1

SPDCCH L1 Reuse Indication

Not configured

Aggregatoin level

SCCE

4

Note 1: PRB = {0, 1, …, 15}.

Table 9.12.1.1-4: Minimum requirement for slot/subslot-PDSCH (FDD)

Test 1

Test 2

Test 3

Test 4

[%]

20

20

20

20

1.05

1.05

1.05

1.05

UE Category

≥2

≥2

≥2

≥2

9.12.1.2 TDD

For the parameters specified in Table 9.12.1.2-1 and Table 9.12.1.2-2 using the downlink physical channels specified in Annex C.3.2, the minimum requirements are specified in Table 9.12.1.2-3 by the following

a) a CQI index not in the set {median CQI -1, median CQI, median CQI +1} shall be reported at least % of the time;

b) the ratio of the throughput obtained when transmitting the transport format indicated by each reported wideband CQI index and that obtained when transmitting a fixed transport format configured according to the wideband CQI median shall be ≥ ;

c) when transmitting the transport format indicated by each reported wideband CQI index, the average BLER for the indicated transport formats shall be greater or equal to 0.02.

Table 9.12.1.2-1: Fading test for slot-PDSCH (TDD)

Parameter

Unit

Test 1

Test 2

Bandwidth

MHz

10 MHz

Transmission mode

4 (ports 0 and 1)

Uplink downlink configuration

2

Special subframe configuration

4

Downlink power allocation

dB

-3

dB

-3

σ

dB

0

SNR (Note 3)

dB

1

2

9

10

dB[mW/15kHz]

-97

-96

-89

-88

dB[mW/15kHz]

-98

-98

Propagation channel

EPA5

Correlation and antenna configuration

High (2 x 2)

Reporting mode

PUSCH 1-1

Reporting interval

ms

5

CQI delay

slots

8

Max number of HARQ transmissions

1

CodeBookSubsetRestriction bitmap

00 0001

DL TTI length

Slot

Configured SPDCCH-PRB sets

{Set 1}

SPDCCH-PRB set used for DCI transmission

Set 1

ACK/NACK feedback mode

Multiplexing

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

Note 2: Reference measurement channel RC.26 TDD according to Table A.4-1 for Categories 2 or higher with one sided dynamic OCNG Pattern OP.1 TDD as described in Annex A.5.1.1.

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 9.12.1.2-2: SPDCCH parameters (FDD)

Parameter

Unit

Set 1

Refence symbol

CRS

Number of PRB per SPDCCH-PRB set

16

Transmission type

Localized

Number of OFDM symbols

1

Number of PRBs per SPDCCH-PRB set (Note 1)

16

Rate Matching mode

Mode 1

SPDCCH L1 Reuse Indication

Not configured

Aggregatoin level

SCCE

4

Note 1: PRB = {0, 1, …, 15}.

Table 9.12.1.2-3: Minimum requirement for slot-PDSCH (FDD)

Test 1

Test 2

[%]

20

20

1.05

1.05

UE Category

≥2

≥2

9.12.2 CQI reporting under fading conditions (CSI Reference Symbol)

9.12.2.1 FDD

For the parameters specified in Table 9.12.2.1-1, Table 9.12.2.1-2, and Table 9.12.2.1-3 using the downlink physical channels specified in Annex C.3.2, the minimum requirements are specified in Table 9.12.2.1-4 by the following

a) a CQI index not in the set {median CQI -1, median CQI, median CQI +1} shall be reported at least % of the time;

b) the ratio of the throughput obtained when transmitting the transport format indicated by each reported wideband CQI index and that obtained when transmitting a fixed transport format configured according to the wideband CQI median shall be ≥ ;

c) when transmitting the transport format indicated by each reported wideband CQI index, the average BLER for the indicated transport formats shall be greater or equal to [0.02].

Table 9.12.2.1-1: Fading test for slot-PDSCH (FDD)

Parameter

Unit

Test 1

Test 2

Bandwidth

MHz

10 MHz

Transmission mode

9

Downlink power allocation

dB

0

dB

0

σ

dB

-3

SNR (Note 3)

dB

3

4

12

13

dB[mW/15kHz]

-95

-94

-86

-85

dB[mW/15kHz]

-98

-98

Propagation channel

EPA5

Correlation and antenna configuration

High (2 x 2)

Beamforming Model

As specified in Section B.4.3

Cell-specific reference signals

Antenna ports 0,1

CSI reference signals

Antenna ports 15,16

CSI-RS periodicity and subframe offset

TCSI-RS / ∆CSI-RS

5/1

CSI-RS reference signal configuration

0

Reporting mode

PUSCH 1-1

Reporting interval

ms

5

CQI delay

slots

8

Max number of HARQ transmissions

1

CodeBookSubsetRestriction bitmap

00 0001

DL TTI length

Slot

Configured SPDCCH-PRB sets

{Set 1}

SPDCCH-PRB set used for DCI transmission

Set 1

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

Note 2: Reference measurement channel RC.27 FDD according to Table A.4-1 for Categories 2 or higher with one sided dynamic OCNG Pattern OP.1 FDD as described in Annex A.5.1.1.

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 9.12.2.1-2: Fading test for subslot-PDSCH (FDD)

Parameter

Unit

Test 3

Test 4

Bandwidth

MHz

10 MHz

Transmission mode

9

Downlink power allocation

dB

0

dB

0

σ

dB

-3

SNR (Note 3)

dB

4

5

12

13

dB[mW/15kHz]

-94

-93

-86

-85

dB[mW/15kHz]

-98

-98

Propagation channel

EPA5

Correlation and antenna configuration

High (2 x 2)

Beamforming Model

As specified in Section B.4.3

Cell-specific reference signals

Antenna ports 0,1

CSI reference signals

Antenna ports 15,16

CSI-RS periodicity and subframe offset

TCSI-RS / ∆CSI-RS

5/1

CSI-RS reference signal configuration

0

Reporting mode

PUSCH 1-1

Reporting interval

ms

5

CQI delay

subslots

8 or 12 (Note 1)

Max number of HARQ transmissions

1

CodeBookSubsetRestriction bitmap

00 0001

DL TTI length

Subslot

Configured SPDCCH-PRB sets

{Set 1}

SPDCCH-PRB set used for DCI transmission

Set 1

Note 1: If the UE reports in an available uplink reporting instance at subslot #n based on CQI estimation at a downlink slot not later than subslot #(n-k), this reported wideband CQI cannot be applied at the eNB downlink before subslot #(n+k), where k = 4 for UE capability ProcessingTimelineSet=set1 and k=6 for UE capability ProcessingTimelineSet=set2.

Note 2: Reference measurement channel RC.29 FDD according to Table A.4-1 for Categories 2 or higher with one sided dynamic OCNG Pattern OP.1 FDD as described in Annex A.5.1.1.

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 9.12.2.1-3: SPDCCH parameters (FDD)

Parameter

Unit

Set 1

Refence symbol

CRS

Number of PRB per SPDCCH-PRB set

16

Transmission type

Localized

Number of OFDM symbols

2

Number of PRBs per SPDCCH-PRB set (Note 1)

16

Rate Matching mode

Mode 1

SPDCCH L1 Reuse Indication

Not configured

Aggregatoin level

SCCE

8

Note 1: PRB = {0, 1, …, 15}.

Table 9.12.2.1-4: Minimum requirement for slot/subslot-PDSCH (FDD)

Test 1

Test 2

Test 3

Test 4

[%]

20

20

20

20

1.05

1.05

1.05

1.05

UE Category

≥2

≥2

≥2

≥2

9.12.2.2 TDD

For the parameters specified in Table 9.12.2.2-1and Table 9.12.2.2-2 using the downlink physical channels specified in Annex C.3.2, the minimum requirements are specified in Table 9.12.2.2-3 by the following

a) a CQI index not in the set {median CQI -1, median CQI, median CQI +1} shall be reported at least % of the time;

b) the ratio of the throughput obtained when transmitting the transport format indicated by each reported wideband CQI index and that obtained when transmitting a fixed transport format configured according to the wideband CQI median shall be ≥ ;

c) when transmitting the transport format indicated by each reported wideband CQI index, the average BLER for the indicated transport formats shall be greater or equal to [0.02].

Table 9.12.2.2-1: Fading test for slot-PDSCH (TDD)

Parameter

Unit

Test 1

Test 2

Bandwidth

MHz

10 MHz

Transmission mode

9

Uplink downlink configuration

2

Special subframe configuration

4

Downlink power allocation

dB

0

dB

0

σ

dB

-3

SNR (Note 3)

dB

3

4

12

13

dB[mW/15kHz]

-95

-94

-86

-85

dB[mW/15kHz]

-98

-98

Propagation channel

EPA5

Correlation and antenna configuration

High (2 x 2)

Beamforming Model

As specified in Section B.4.3

Cell-specific reference signals

Antenna ports 0,1

CSI reference signals

Antenna ports 15,16

CSI-RS periodicity and subframe offset

TCSI-RS / ∆CSI-RS

5/1

CSI-RS reference signal configuration

0

Reporting mode

PUSCH 1-1

Reporting interval

ms

5

CQI delay

Slots

8

Max number of HARQ transmissions

1

CodeBookSubsetRestriction bitmap

00 0001

DL TTI length

Slot

Configured SPDCCH-PRB sets

{Set 1}

SPDCCH-PRB set used for DCI transmission

Set 1

ACK/NACK feedback mode

Multiplexing

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

Note 2: Reference measurement channel RC.27 TDD according to Table A.4-1 for Categories 2 or higher with one sided dynamic OCNG Pattern OP.1 TDD as described in Annex A.5.1.1.

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 9.12.2.2-2: SPDCCH parameters (TDD)

Parameter

Unit

Set 1

Refence symbol

CRS

Number of PRB per SPDCCH-PRB set

16

Transmission type

Localized

Number of OFDM symbols

2

Number of PRBs per SPDCCH-PRB set (Note 1)

16

Rate Matching mode

Mode 1

SPDCCH L1 Reuse Indication

Not configured

Aggregatoin level

SCCE

8

Note 1: PRB = {0, 1, …, 15}.

Table 9.12.2.2-3: Minimum requirement for slot-PDSCH (TDD)

Test 1

Test 2

[%]

20

20

1.05

1.05

UE Category

≥2

≥2