m_wrappingDelta and Initial SQN values

[laurent-dubesset]

Hello,

m_wrappingDelta value: what is the values please?
Initial SQN value : where can I find the initial value of SQN when I run UERANSIM for the first time and or a given IMSI?
If I stop the software and then run it again, do you store the SQN somewhere to avoid being out of SYNCH with the UDM stored value or will you simply let the SYNCHONIZATION procedure run?

Thanks

[abousselmi]

Hi Laurent,

Regarding the SQN wrapping delta, SqnManager takes two values as input

UERANSIM/src/ue/nas/usim/sqn_mng.hpp

Line 29 in 1d184a7

SqnManager(uint64_t indBitLen, uint64_t wrappingDelta);

The second one is the wrappingDelta, which in terns can be found here:

UERANSIM/src/ue/nas/usim/usim.cpp

Line 18 in 1d184a7

m_sqnMng = std::make_unique<SqnManager>(5ull, 1ull << 28ull);

1ull << 28ull = 268435456

Cheers,