Transport channel — How information is to be carried

5G Systems Notes · Concept map · Transport channel Route · Hierarchy · Index · All concepts · Hub

The protocol stack

Where it sits

Sits atLevel 6 of the hierarchy · The protocol stack · explained
The 4 of them
DL-SCH — downlink shared channel — nearly everything, and it lands on PDSCH
UL-SCH — uplink shared channel — its mirror, on PUSCH
PCH — paging channel — has no physical channel of its own; it is carried on PDSCH
BCH — broadcast channel — the master information block only, on PBCH
Learn firstLogical channel · Transport block — 7 concepts in the full chain, see the paths
UnlocksPDSCH
Primary clauseTS 38.300 §6.2.1
Used innr-pdsch 33 · index 3
Scanned from the notes at page load and joined with terms.json; nothing on this card is typed by hand.

What it is

A transport channel is a contract: blocks of this size, this often, with these guarantees. It describes a service, and has no subcarriers, symbols or modulation of its own.

DL-SCH — the downlink shared channel — supports HARQ, dynamic link adaptation, beamforming, and both dynamic and semi-static allocation (TS 38.300 clause 6.2.1). That list is essentially a description of a shared resource.

The distinction from a physical channel is the one to hold on to: DL-SCH is what MAC believes it is talking to; PDSCH is what the antenna does about it. PCH, the paging channel, has no physical channel of its own — "the PCH is carried on PDSCH" (TS 38.202 clause 5.2.3).

Read on

The full treatment is in nr-pdsch — this page is the definition and the map reference; that note is where the subject is actually developed.

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Before this concept, the hierarchy says to learn the following — the full chain, in order:

To understand Transport channel (level 6) you first need 7 other concepts. Read them in this order — everything on one line can be read in any order, but no line before the one above it:
Level Learn these
0 Logical channel · Subcarrier
1 OFDM
2 OFDM symbol
3 Resource element
4 Physical layer
5 Transport block
Immediately before Transport channel: Transport block, Logical channel.
Keep going — where this sits on the route
◀Bandwidth partstep 59 · level 6
Step 60 of 118level 6 · The protocol stack
MACstep 61 · level 6▶
Level 6 → 7 · this unlocks
PDSCH level 12
↳ all 13 concepts at level 7 · level 6 in full · the whole route
The route is every concept in the folder ordered by level, so nothing here needs anything after it. Computed at page load from terms.json; the same numbering as the route page.
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