Content for TR 38.835 Word version: 18.0.1
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B.1.8 Buffer status report p. 42
This clause captures the capacity performance evaluation results of enhancements related to buffer status report (BSR).
The performance of legacy BSR (scheme 8.1 in Table B.1.8-1 and Table B.1.8-2) has been compared against enhanced BSR schemes. Particularly, the following schemes have been evaluated:
- Scheme 8.1: Legacy dynamic scheduling with legacy BSR.
- Scheme 8.2: BSR with precise buffer size, where new buffer status (BS) table(s) with finer granularity is designed.
- Scheme 8.3: XR-specific triggering mechanism of BSR report. In this scheme, the pre-scheduling dynamic grant based on the XR awareness is considered and XR specific PDCCH monitoring is aligned with the periodicity of XR packet generation. The BSR is also enhanced to have XR-specific triggering mechanism of BSR report to minimize the scheduling delay. The XR-specific BSR report triggering mechanism is that the BSR report will be triggered at the 1st PUSCH of each XR packet at each cycle to inform gNB the remaining packet size to be transmitted after the 1st PUSCH transmission of the XR traffic. When gNB receive the BSR, gNB would schedule UE the UL PUSCH transmission until the completion of XR packet delivery in this cycle.
| 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 [CATT] | R1-2211175 | 8.1 | DDDUU | SU-MIMO | 10 | 30 | 5.4 | 5 | 90 | Note 1,2 |
| Source [CATT] | R1-2211175 | 8.3 | DDDUU | SU-MIMO | 10 | 30 | 7.2 | 7 | 90 | Note 1,2 |
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NOTE 1:
BS antenna parameters: 32TxRUs, (M, N, P, Mg, Ng; Mp, Np) = (4,4,2,1,1:4,4)
NOTE 2:
SR/BSR periodicity = 5 ms
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| 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 [ZTE] | R1-2211906 | 8.1* | DDDSU | MU-MIMO | 10 | 30 | 9.5 | 9 | 95 | Note 1,2 |
| 20 | 3.4 | 3 | 91 | |||||||
| Source [ZTE] | R1-2211906 | 8.2 | DDDSU | MU-MIMO | 10 | 30 | 10.9 | 10 | 94 | Note 1,2 |
| 20 | 5.1 | 5 | 90 | |||||||
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NOTE 1:
BS antenna parameters: 64TxRUs, (M, N, P, Mg, Ng; Mp, Np) = (8,8,2,1,1:4,8)
NOTE 2:
SR periodicity = 2.5 ms
*
The length of the field for the Short BSR format and the Short Truncated BSR format is 5 bits
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Based on the evaluation results in Table B.1.8-1 and Table B.1.8-2 the following observations can be made:
- For FR1, DU, UL, with 100MHz bandwidth for AR single-stream traffic model, 10Mbps, 30ms PDB, 60 FPS, with MU-MIMO and 64TxRU, it is observed from Source [ZTE] that the capacity is increased from 9.5 UEs per cell with Legacy BSR to 10.9 UEs per cell with BSR with precise buffer size (capacity gain is 15%).
- For FR1, DU, UL, with 100MHz bandwidth for AR single-stream traffic model, 20Mbps, 30ms PDB, 60 FPS, with MU-MIMO and 64TxRU, it is observed from Source [ZTE] that the capacity is increased from 3.4 UEs per cell with Legacy BSR to 5.1 UEs per cell with BSR with precise buffer size (capacity gain is 50%).
- For FR1, InH, UL, with 100MHz bandwidth for AR single-stream traffic model, 10Mbps, 30ms PDB, 60 FPS, with SU-MIMO and 32TxRU, it is observed from Source [CATT] that the capacity is increased from 5.4 UEs per cell with dynamic grant scheduling to 7.2 UEs per cell with XR-specific triggering mechanism of BSR report (capacity gain is 33%).
