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hack for RLC AM ACK reporting

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hack: in schedule_ue_spec, 3 bytes are "reserved" (this should be
done better). An RLC AM entity may ask for only 2 bytes for
ACKing and get a TBS of 32 bits and due to these 3 reserved bytes we may
end up with only 1 byte left for RLC, which is not enough. This hack
prevents the problem. To be done better at some point. If the function
schedule_ue_spec is (has been) reworked, this hack can be removed.
Dig for "TBS - ta_len - header_length_total - sdu_length_total - 3"
in schedule_ue_spec.

This should be done better at some point.
This commit is contained in:
Cedric Roux
2020-07-02 09:13:45 +02:00
parent 12e5fe3399
commit 71f75a3d88
1 changed files with 12 additions and 0 deletions
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openair2/LAYER2/MAC/pre_processor.c
+12
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@@ -295,6 +295,18 @@ store_dlsch_buffer(module_id_t Mod_id,
#endif #endif
} }
/* hack: in schedule_ue_spec, 3 bytes are "reserved" (this should be
* done better). An RLC AM entity may ask for only 2 bytes for
* ACKing and get a TBS of 32 bits and due to these 3 reserved bytes we may
* end up with only 1 byte left for RLC, which is not enough. This hack
* prevents the problem. To be done better at some point. If the function
* schedule_ue_spec is (has been) reworked, this hack can be removed.
* Dig for "TBS - ta_len - header_length_total - sdu_length_total - 3"
* in schedule_ue_spec.
*/
if (UE_template->dl_buffer_total > 0 && UE_template->dl_buffer_total <= 2)
UE_template->dl_buffer_total += 3;
if (UE_template->dl_buffer_total > 0) if (UE_template->dl_buffer_total > 0)
LOG_D(MAC, LOG_D(MAC,
"[eNB %d] Frame %d Subframe %d : RLC status for UE %d : total DL buffer size %d and total number of pdu %d \n", "[eNB %d] Frame %d Subframe %d : RLC status for UE %d : total DL buffer size %d and total number of pdu %d \n",