[srslte-users] Issue on SI / SIB messages

[Taillefer Simon]

Hello srsLTE team,

Basically, we are encountering an issue on the RRC protocol. We want to send long SI / SIB messages but when the size is higher than 277 bytes, some errors are raised.
More precisely, the errors are:

-          Error("Computing DL grant\n"); from srsLTE/srsenb/src/phy/cc_worker.cc file, around line 519 (depending on the srsLTE version and added code on our side)

-          ERROR("Configuring TB Info\n"); from srsLTE/lib/src/phy/phch/ra_dl.c file, around line 627.



We found that these errors are coming from the grants[i].dci.tb[0].mcs_idx variable which has a value of -1 (4294967295 exactly) instead of an unsigned integer. Then, we suppose that the size of the corresponding transport block cannot be found in the tbs_table (srsLTE/lib/src/phy/phch/tbs_tables.h file, line 38) and this is why we have errors raised.



So our questions are:

-          How this grants[i].dci.tb[0].mcs_idx variable is calculated?

-          Do you know why its value is -1 (4294967295) when the size of the SI / SIB messages is longer than 277 bytes?

-          Maybe we are on the wrong way so do you know how it is possible to send long SI / SIB messages?

Thank you for your help,

Simon Taillefer




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