Content for TR 38.835 Word version: 18.0.1

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B.1.10 XR-specific playoutDelayForMediaStartup for gNB scheduling awareness
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B.1.10 XR-specific playoutDelayForMediaStartup for gNB scheduling awareness p. 44

This clause captures the capacity performance evaluation results of enhancements related to gNB awareness about playoutDelayForMediaStartup and appLayerBufferLevel, where the former is the waiting time that the user experiences for media start-up and the latter is buffer level, which indicates the playout duration for which media data of all active media components is available starting from the current playout time, where.

The performance dynamic grant scheduling (scheme 10.1 in Table B.1.10-1) has been compared against the scheme with playoutDelayForMediaStartup and appLayerBufferLevel awareness. Particularly, the following schemes have been evaluated:

Scheme 10.1: Dynamic grant scheduling.
Scheme 10.2: XR-specific playoutDelayForMediaStartup scheme. In this scheme, the playoutDelayForMediaStartup and appLayerBufferLevel is shared by the UE with the gNB. The scheme assumes, the feedback of XR-specific playoutDelayForMediaStartup and appLayerBufferLevel from UE would give the gNB scheduler additional delay budget in scheduling the XR data transmission to achieve additional link adaptation gain. For example, when the reported appLayerBufferLevel is 3 frames, gNB scheduler extends PDB for scheduling the XR packet on PDSCH for additional 50 ms. gNB prioritizes the UE scheduling based on the extended delay budged from the reported playout delay size and buffer level, in which a group UEs in the same priority queue are with the same length of playout delay.

Table B.1.10-1: FR1, DL, InH, VR/AR at 60 FPS

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	10.1	DDDSU	MU-MIMO	30	10	10.9	10	90.97%	Note 1,2
Source [CATT]	R1-2211175	10.1	DDDSU	SU-MIMO	30	10	3.7	3	92.5%	Note 1,2
Source [CATT]	R1-2211175	10.1	DDDSU	MU-MIMO	30	10	11.5	11	95.83%	Note 1,3
Source [CATT]	R1-2211175	10.1	DDDSU	SU-MIMO	30	10	5.8	5	96.7%	Note 1,3
Source [CATT]	R1-2211175	10.2*	DDDSU	MU-MIMO	30	10	16	16	95%	Note 1
Source [CATT]	R1-2211175	10.2**	DDDSU	MU-MIMO	30	10	20	20	92%	Note 1
Source [CATT]	R1-2211175	10.2***	DDDSU	MU-MIMO	30	10	20	20	91%	Note 1
Source [CATT]	R1-2211175	10.2**	DDDSU	SU-MIMO	30	10	7.3	7	91.3%	Note 1
Source [CATT]	R1-2211175	10.2***	DDDSU	SU-MIMO	30	10	11.8	11	98.3%	Note 1
Source [CATT]	R1-2211175	10.2****	DDDSU	SU-MIMO	30	10	11.3	11	94.4%	Note 1
NOTE 1: BS antenna parameters: 32TxRUs, (M, N, P, Mg, Ng; Mp, Np) = (4,4,2,1,1:4,4) NOTE 2: C-DRX configuration (16,12,4) NOTE 3: UE always on * 2 frames playout delay 3 frames playout delay * 4 frames playout delay **** mixed playout delay {3, 4}

Based on the evaluation results in Table B.1.10-1 the following observations can be made:

For FR1, DL, InH, with 100MHz bandwidth for VR/AR single-stream traffic model, 30Mbps, 10ms PDB, 60 FPS, with MU-MIMO and 32TxRU, C-DRX configuration (16,12,4), it is observed from Source [CATT] that the capacity is increased from 10.9 UEs per cell with grant scheduling to 16/20/20 UEs per cell with XR-specific playoutDelayForMediaStartup scheme with 2/3/4 frames playout delay, respectively (capacity gains are 47%/83%/83%).
For FR1, DL, InH, with 100MHz bandwidth for VR/AR single-stream traffic model, 30Mbps, 10ms PDB, 60 FPS, with MU-MIMO and 32TxRU, UE always on, it is observed from Source [CATT] that the capacity is increased from 11.5 UEs per cell with grant scheduling to 16/20/20 UEs per cell with XR-specific playoutDelayForMediaStartup scheme with 2/3/4 frames playout delay, respectively (capacity gains are 39%/74%/74%).
For FR1, DL, InH, with 100MHz bandwidth for VR/AR single-stream traffic model, 30Mbps, 10ms PDB, 60 FPS, with SU-MIMO and 32TxRU, C-DRX configuration (16,12,4), it is observed from Source [CATT] that the capacity is increased from 3.7 UEs per cell with grant scheduling to 7.3/11.8/11.3 UEs per cell with XR-specific playoutDelayForMediaStartup scheme with 3/4 and mixed {3,4} frames playout delay, respectively (capacity gains are 97%/219%/205%).
For FR1, DL, InH, with 100MHz bandwidth for VR/AR single-stream traffic model, 30Mbps, 10ms PDB, 60 FPS, with SU-MIMO and 32TxRU, UE always on, it is observed from Source [CATT] that the capacity is increased from 5.8 UEs per cell with grant scheduling to 7.3/11.8/11.3 UEs per cell with XR-specific playoutDelayForMediaStartup scheme with 3/4 and mixed {3,4} frames playout delay, respectively (capacity gains are 26%/103%/95%).