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add documentation on scheduling ACK/NACK

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Signed-off-by: francescomani <email@francescomani.it>
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francescomani
2026-05-13 11:31:43 +02:00
committed by Francesco Mani
parent c90f972131
commit ef22e593ed
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doc/MAC/mac-usage.md
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@@ -63,6 +63,20 @@ in aggregation level 2 which translates to `uess_agg_levels` set to `[0, 2, 0,
0, 0]`. For example, to enable one candidate on aggregation levels 2 and 4 set
`uess_agg_levels` to `[0, 1, 1, 0, 0]`.
## Feedback time for ACK/NACK on PUCCH
Feedback time for DLSCH ACK/NACK on PUCCH is selected by looping among the values on a list
(either default one or defined by upper layers). If the given element of the list provides
a feedback slot compatible with the frame configuration and the configured minimum feedback time,
the scheduler checks if there is an already active PUCCH in the given slot.
If there is no active PUCCH, it activates one and it increases by one the DAI counter to signal
the presence of one HARQ process feedback in the given PUCCH occasion.
If there is an already active PUCCH, it tries to allocate the feedback on that instance
pending multiple checks including
* the possibility to schedule HARQ and CSI feedback simultaneously
* the possibility to transition from a format with 2 bits limit to one without in case the limit is surpassed
* resource availability in terms of beam, PRBs and PUCCH coderate
### Examples:
#### Example 1:
Say we have 90% PDCCH success rate at aggregation level 1, `pdcch_cl_adjust` will stay at 0