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Content for  TR 38.835  Word version:  18.0.1

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B.1.4 Enhanced CQI based on DMRS 
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B.1.4  Enhanced CQI based on DMRS  p. 25

This clause captures the capacity performance evaluation results of DMRS-based enhanced CQI reporting where the initial transmission is based on legacy CQI reporting, while the retransmission is DMRS based CQI reporting.
The performance of the current TB-based transmission with legacy CQI reporting (scheme 4.1 in Tables B.1.4) has been compared against CBG-based transmission (scheme 4.2 in Tables B.1.4) as well as TB-based re-transmission and DMRS-based CQI (scheme 4.3 in Tables B.1.4):
  • Scheme 4.1: TB-based re-transmission (baseline scheme). In this scheme, TB-based retransmission is applied with legacy CSI reporting. Different outer-loop link adaptation configurations are used.
  • Scheme 4.2: CBG-based re-transmission. In this scheme, CBG-based retransmission is applied with legacy CSI reporting. Different outer-loop link adaptation configurations are used. The number of CBGs per TB is equal to 8.
  • Scheme 4.3: TB-based re-transmission with DMRS-based CQI. In this scheme, TB-based transmission/retransmission is applied where for the initial TB transmission legacy CQI reporting is used, while for the retransmission DMRS-based CQI reporting is used.
The performance results are reported in Table B.1.4-1 and Table B.1.4-2 in terms of the ratio of satisfied users.
Source Tdoc Source Scheme TDD format SU/MU-MIMO Data rate (Mbps) PDB (ms) Capa­city (UEs/cell) C1=floor (Capa­city) % of satis­fied UEs when #UEs/cell = C1 Notes
Source [Ericsson]R1-22084024.1*DDDSUSU-MIMO30108.03890%Note 1,2
1510.221092%
Source [Ericsson]R1-22084024.2*DDDSUSU-MIMO30108.08891%Note 1,2,3
1510.341093%
Source [Ericsson]R1-22084024.3*DDDSUSU-MIMO30108.52893%Note 1,2
1511.371194%
Source [Ericsson]R1-22084024.1**DDDSUSU-MIMO30107.21792%Note 1,2
158.29893%
Source [Ericsson]R1-22084024.2**DDDSUSU-MIMO30107.25793%Note 1,2,3
158.33893%
Source [Ericsson]R1-22084024.3**DDDSUSU-MIMO30107.49794%Note 1,2
158.66894%
Source [Ericsson]R1-22084024.1***DDDSUSU-MIMO30107.89796%Note 1,2
159.48994%
Source [Ericsson]R1-22084024.2***DDDSUSU-MIMO30108.01890%Note 1,2,3
159.59995%
Source [Ericsson]R1-22084024.3***DDDSUSU-MIMO30108.53894%Note 1,2
1510.311093%
NOTE 1:
BS antenna parameters: 32TxRUs, (M, N, P, Mg, Ng; Mp, Np) = (4,4,2,1,1,4,4)
NOTE 2:
Interleaved VRB-to-PRB mapping is applied
NOTE 3:
iid CBG errors in a TB are assumed
*
without outer loop, BLER = 10%
**
with outer loop, BLER = 10%
***
with outer loop, BLER = 22%
Source Tdoc Source Scheme TDD format SU/MU-MIMO Data rate (Mbps) PDB (ms) Capa­city (UEs/cell) C1=floor (Capa­city) % of satis­fied UEs when #UEs/cell = C1 Notes
Source [Ericsson]R1-22084024.1*DDDSUSU-MIMO30105.59594%Note 1,2
159.0990%
Source [Ericsson]R1-22084024.2*DDDSUSU-MIMO30105.80595%Note 1,2,3
159.15991%
Source [Ericsson]R1-22084024.3*DDDSUSU-MIMO30106.79694%Note 1,2
1510.281093%
Source [Ericsson]R1-22084024.1**DDDSUSU-MIMO30105.88596%Note 1,2
157.26792%
Source [Ericsson]R1-22084024.2**DDDSUSU-MIMO30105.9597%Note 1,2,3
157.29793%
Source [Ericsson]R1-22084024.3**DDDSUSU-MIMO30106.13691%Note 1,2
157.40793%
Source [Ericsson]R1-22084024.1***DDDSUSU-MIMO30106.40693%Note 1,2
158.24892%
Source [Ericsson]R1-22084024.2***DDDSUSU-MIMO30106.46693%Note 1,2,3
158.32893%
Source [Ericsson]R1-22084024.3***DDDSUSU-MIMO30107790.0%Note 1,2
158.84896%
NOTE 1:
BS antenna parameters: 64TxRUs, (M, N, P, Mg, Ng; Mp, Np) = (8,8,2,1,1:4,8)
NOTE 2:
Interleaved VRB-to-PRB mapping is applied
NOTE 3:
iid CBG errors in a TB are assumed
*
without outer loop, BLER = 10%
**
with outer loop, BLER = 10%
***
with outer loop, BLER = 22%
Based on the evaluation results in Table B.1.4-1 and Table B.1.4-2, the following observations can be made:
  • For FR1, InH, DL, with 100MHz bandwidth for VR/AR single-stream traffic model, 30Mbps, 10ms PDB, 60 FPS, with SU-MIMO and 32TxRU, it is observed from Source [Ericsson] that the capacity is increased by 6%, 4% and 8% when DMRS-based CQI is used as compared to legacy CQI for outer-loop link adaptation configurations of 'disabled', BLER=10% and BLER=22%, respectively.
  • For FR1, InH, DL, with 100MHz bandwidth for VR/AR single-stream traffic model, 30Mbps, 15ms PDB, 60 FPS, with SU-MIMO and 32TxRU, it is observed from Source [Ericsson] that the capacity is increased by 11%, 4% and 9% when DMRS-based CQI is used as compared to legacy CQI for outer-loop link adaptation configurations of 'disabled', BLER=10% and BLER=22%, respectively.
  • For FR1, UMa, DL, with 100MHz bandwidth for VR/AR single-stream traffic model, 30Mbps, 10ms PDB, 60 FPS, with SU-MIMO and 64TxRU, it is observed from Source [Ericsson] that the capacity is increased by 21%, 4% and 9% when DMRS-based CQI is used as compared to legacy CQI for outer-loop link adaptation configurations of 'disabled', BLER=10% and BLER=22%, respectively.
  • For FR1, UMa, DL, with 100MHz bandwidth for VR/AR single-stream traffic model, 30Mbps, 15ms PDB, 60 FPS, with SU-MIMO and 64TxRU, it is observed from Source [Ericsson] that the capacity is increased by 14%, 2% and 7% when DMRS-based CQI is used as compared to legacy CQI for outer-loop link adaptation configurations of 'disabled', BLER=10% and BLER=22%, respectively.
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