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Time Domain

SLIV Calculator

Encode and decode Start and Length Indicator Values (SLIV) for 5G NR PDSCH/PUSCH time domain resource allocation.

Parameter Control

sym
sym

Analysis Console

Awaiting Parameter Configuration

Understanding SLIV

What is SLIV?

5G NR SLIV stands for Start-Length Indicator Value. It’s a compact way used in 5G New Radio (NR) to describe where a transmission starts in time and how long it lasts, all with a single number.

"SLIV is a compact encoding used in 5G NR to describe the start position and duration of a transmission in the time domain using a single value."

  • Start Symbol (S): Which OFDM symbol in the slot the transmission begins.
  • Length (L): How many consecutive symbols the transmission occupies.

Why SLIV Exists?

Instead of signaling S and L separately, NR combines them into one integer called SLIV for efficiency.

  • ✓Reduces signaling overhead (important for fast scheduling)
  • ✓Keeps control messages like DCI compact
  • ✓Ensures deterministic decoding at the receiver

How SLIV Works

Valid values of S and L are mapped to a unique SLIV number through a bijective mapping.

The Mechanism

The mapping is bijective (no ambiguity). The receiver decodes SLIV → recovers S and L. You normally don’t compute SLIV by hand—this is handled by the gNB scheduler and UE firmware.

Constraint
0 < L ≤ 14 - S

Where It's Used

PDSCH (Downlink)
PUSCH (Uplink)
DCI Messages

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5G NR Band Reference
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