SBN

Source Block Number

Other →
Introduced in Rel-8

SBN is the Source Block Number, an identifier used in multimedia broadcast and multicast services to number source blocks for forward error correction, aiding in packet reassembly for reliable delivery.

Category
Other
Introduced
Rel-8
Where
Services › Codecs
Specifications
3 specs
SBN Description Purpose Detected Changes Specifications

Description

Source Block Number

Purpose & Motivation

Detected Changes Across Releases

from 3GPP Change Requests

Specific changes extracted from the „Change history“ tables of 3GPP specifications (1 CRs across 1 releases). Complements the general historical overview above with the evidence-based evolution of this function.

Studied in Rel-8, normative work from Rel-17.

Rel-17 1 change

In Release 17, the specification introduced the "FEC-OTI-Maximum-Source-Block-Length" parameter for the FEC Compact-No-Code scheme, which is part of the FEC building block used within ALC for MBMS download delivery. This provides a defined limit for the Source Block Number (SBN) function when the no-code FEC code is applied, where the FEC building block allows the choice of an appropriate FEC code, including simply sending the original data without coding.

  • FEC-OTI-Maximum-Source-Block-Length for FEC Compact-No-Code TS 26.346CR0669

Explore further

Broader topics and technologies where SBN plays a role.

Topics
Lawful InterceptServices & ApplicationsRadio Access Network

Defining Specifications

3GPP specifications that define or reference SBN, with the latest known release. Sourced from the 3GPP document catalog — see methodology.

SpecificationTitleRelease
TS 26.346 vj20 MBMS User Services Media Codecs & Protocols Rel-19
TR 26.946 vj00 MBMS User Services Overview Rel-19
TR 26.947 vj00 FEC Evaluation for MBMS Enhancement Rel-19