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Security Accelerator operation during handover

Onur AYDIN
Prodigy 10 points
Other Parts Discussed in Thread: TCI6638K2K

Hi,

We have known that PDCP COUNT value is not needed as an input to SA for the data PDU packets to be air-ciphered. SA counts DL packets itself. However while we are considering handover case that requires data forward from source enodeB to target enodeB preserving SN values for the PDCP DRB SDUs associated with RLC AM mode, that type of operation may not work. At the TeNB side, there might be gaps between SN numbers of consecutive forwarded SDUs, on the other hand SA will calculate the PDCP count sequentially. I wonder if there is a way to send PDCP Data to SA with its individual COUNT value as we do for SRBs?

The device is: TCI6638K2K

Thank you,

Onur AYDIN

  • 0
    TI__Guru* 81335 points

    Welcome to the TI E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages (for processor issues). Be sure to search those for helpful information and to browse for the questions others may have asked on similar topics (e2e.ti.com). Please read all the links below my signature.

    We will get back to you on the above query shortly. Thank you for your patience.

  • 0 in reply to Raja
    TI__Expert 5805 points

    Hi Raja,

    Depends on what software layer you are using. We have an API to send the data to SA with individual COUNTC. We call it “slow path” operation. This API is not part of the SA LLD is at the NetFP. Specifically, the name is Netfp_encodeDrb. There are more details in the software release documentation of NetFP.

    Kind regards,

    Javier

  • 0 in reply to Javier Malave-Bonet
    TI__Expert 5805 points
    What I mean by "not part of the SA LLD" is that the abstraction that takes care of this particular operation is not "built-in" into the SA LLD. But, you can reference NetFP to understand how to address your design in case you don't want NetFP.