Throughput & Integrity Optimization

Maximise user and cell throughput while protecting latency, reliability and voice quality — scheduling, SU/MU/Massive MIMO, Carrier Aggregation, DSS and 256QAM on one side; HARQ, DRX/eDRX, BLER and VoNR on the other. Built on the Samsung SVR25B feature set.

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Day objective — push DL/UL throughput up without breaking latency, BLER or VoNR quality. Every feature below is a real SVR25B FGR; params come from the SVR25A DU Command Reference.

4.1

Throughput Optimization (LTE & NR)

Maximise the bits — the scheduling / MIMO / HARQ stack, Carrier Aggregation and DSS, higher-order modulation, and the KPIs (DL/UL throughput, PRB, MCS, MIMO Rank, CQI) that measure it.

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Technology deep-dives — throughput differs by radio technology. Each page below is fully wired — the layer ladder / split bearer / PRB playbook, verbatim counters, interactive localizers and the full feature stack — for LTE, 5G NSA and 5G SA separately.LTE ›5G NSA ›5G SA ›

LTE throughput — the 5-layer ladder (GTP→PDCP→RLC→MAC→IP) · CA/MIMO/DRX · ladder localizer
5G NSA throughput — split-bearer anatomy (Fam 5126) · X2 tax · split visualizer
5G SA throughput — the 4-band PRB playbook · MCS/CQI/RI · FGR-RC/RS features · decision engine

The throughput stack — scheduler → MIMO → modulation → HARQSVR25B

each stage multiplies the bitsThroughput ≈ bandwidth × layers × modulation × coding × (1 − BLER).

MIMO features (SVR25B) — layers & beamforming

SU / MU / Massive MIMO

FGR	Feature	What it adds
`FGR-RC0202`	DL SU-MIMO for NR	Multiple layers to one UE (rank up)
`FGR-RC0203`	DL MU-MIMO for NR	Pair multiple UEs on the same PRBs
`FGR-RC0204`	DL SRS-based SU-MIMO	SRS-driven precoding for SU-MIMO
`FGR-RC1000`	TDD DL Massive MIMO	Beamformed high-order MIMO (MMU)
`FGR-RC1041`	Channel Prediction for Massive MIMO	Predict channel for faster beam tracking
`FGR-RS0252 / RS0253`	UL SU-MIMO / UL MU-MIMO	Uplink spatial multiplexing
`FGR-RS1101`	UL Receive Beamforming (Massive MIMO)	Array gain on the uplink

Scheduling, Carrier Aggregation & DSS (SVR25B)

Capacity features

FGR	Feature	What it adds
`FGR-RC0100`	Carrier Aggregation (call procedure)	Add SCell(s) to widen the pipe
`FGR-RS0620`	Scheduling for CA	Cross-carrier scheduling of the aggregated cells
`FGR-RS0622`	Scheduling for IP-throughput enhancement	`dl-ip-throughput-enhancement` for burst TCP
`FGR-RS0703`	QoS Scheduling	Per-bearer GBR / non-GBR strategies
`FGR-RS7003`	DL prescheduling	Cut first-packet latency for bursty traffic
`FGR-RS1201 / RS1202`	LTE-NR DSS (frame / slot-level)	Share the carrier with LTE dynamically

Throughput golden parameters (SVR25A DU Command Reference)

DU-side throughput params

Parameter	Controls	Tune toward
mcs-table-config (256QAM)	Highest modulation order (64→256QAM)	256QAM on for good-SINR cells
mu-mimo-config / ul-mu-mimo-config	MU-MIMO pairing & layers	Enable where UE density supports pairing
max rank (rank1…rank4)	Max MIMO layers per UE	Raise where RI reports support it
scell-config (CA)	SCell add / activation policy	Aggressive add for high-demand UEs
dss-mode	LTE-NR DSS operating mode	Balance NR vs LTE share (Day-5 DSS)
dl-ip-throughput-enhancement	Burst-TCP scheduling boost	On for eMBB IP throughput

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What to read — DL/UL throughput, DL/UL PRB utilization, MCS distribution, MIMO Rank (RI) and CQI. Low throughput at high PRB → coverage/MCS-limited (raise SINR, check 256QAM eligibility); low throughput at low PRB → scheduler/CA not engaging (check SCell add, prescheduling).

4.2

Integrity Optimization

Protect the quality of the bits — latency, residual BLER, packet loss and VoNR voice quality, the HARQ/RLC/PDCP + DRX stack, and the SINR–CQI cascade that drives them.

The SINR → CQI → MCS → BLER cascadeintegrity chain

SINR sets the ceilingWrong CQI→MCS mapping → BLER spikes → HARQ retx → latency & lower throughput.

Integrity features (SVR25B)

Reliability / latency / voice

FGR	Feature	Protects
`FGR-RS0501`	HARQ	Reliability — retransmit failed TBs
`FGR-CC6201`	NR Extended DRX (eDRX)	Battery vs latency in idle/inactive
`FGR-RS0301`	UL Power Control	UL SINR → UL BLER / coverage
`FGR-RS0401`	Timing Advance Control	UL orthogonality (avoids inter-symbol)
`FGR-RS1306`	UL VoNR Codec-adaptation scheduling	VoNR voice quality under load
`FGR-BC7002`	Max Rate Control per QCI/5QI/Slice	Shape rate per QoS class

Integrity golden parameters & the DRX latency trade-off

DRX / HARQ / VoNR params (SVR25A DU)

Parameter	Controls	Trade-off
drx-long-cycle	Sleep cycle length	Longer = battery↑ but latency↑
drx-inactivity-timer	Stay-awake after activity	Longer = latency↓ but battery↓
harq-config	Max HARQ retransmissions	More = reliability↑ but latency↑
bler-target (link adaptation)	1st-Tx BLER operating point	Lower = safer MCS but throughput↓
TDD-power / UL power control	UL received power target	Higher = SINR↑ but interference↑

The core integrity tension — HARQ retransmissions and DRX both trade latency against reliability/battery. VoNR is the canary: rising jitter or packet loss on the QoS-1 bearer usually means DRX is too aggressive or BLER target is set too high — tune DRX-inactivity up and re-check MOS before touching the scheduler.

LAB

Hands-on Lab 4 — Throughput Trial & VoNR Quality

Run a throughput trial across scheduling / CA / MIMO, then tune a latency / VoNR quality case — and confirm one didn't cost the other.

Hands-on Lab 4

Scheduling / CA / MIMO trial · latency & VoNR tuning

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1Baseline throughput, PRB utilization, MCS, RI and CQI from counters
2Throughput trial — enable 256QAM (mcs-table-config) / add SCell (CA) / raise MU-MIMO pairing
3Latency / VoNR case — tune drx-inactivity-timer & harq-config; watch VoNR MOS
4Verify throughput gain with no BLER / VoNR regression

256QAMCA-SCellMU-MIMODRXVoNR

Deliverable — a throughput improvement proven safe against latency, BLER and voice-quality KPIs.