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bugfix: increase RLC UM header size

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The constant RLC_UM_SEGMENT_NB_MAX_LI_PER_PDU is set to 24. This is
too low. Running a downlink TCP iperf with a 10MHz or 20MHz cell
leads to lots of the following warning in the log:

[RLC][W][SN 792] Bad RLC header! Discard this RLC PDU (size=618)

The problem is that the uplink RLC PDU contains a lot of TCP ack.
We can see much more than 24 of them. The RLC layer is not happy
and discards the PDU.

Putting 256 for RLC_UM_SEGMENT_NB_MAX_LI_PER_PDU (arbitrarily chosen,
big but not too big) solves the problem, at least for 10MHz.
This commit is contained in:
Cedric Roux
2017-04-10 17:31:21 +02:00
parent fbcc9a2393
commit 94f880ad23
1 changed files with 1 additions and 1 deletions
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openair2/LAYER2/RLC/UM_v9.3.0/rlc_um_constants.h
+1 -1
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@@ -53,7 +53,7 @@
// UM_Window_Size = 512 when a 10 bit SN is configured and UM_Window_Size = 0
// when the receiving UM RLC entity is configured for MCCH or MTCH.
// li field (values shifted 1 bit left)
# define RLC_UM_SEGMENT_NB_MAX_LI_PER_PDU 24
# define RLC_UM_SEGMENT_NB_MAX_LI_PER_PDU 256
//----------------------------------------------------------
// Events defined for state model of the acknowledged mode entity
/** Internal event defined for state model of the RLC UM. */