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In EEA (EPS Encryption Algorithm) and EIA (EPS Integrity Algorithm), what exactly does the direction (uplink/downlink) indicate? It's confusing because for both encryption and decryption of a given plaintext, the direction has to be same.

This w.r.t the LTE communication.

For your reference, the section B.1 in 33401-g00.zip at https://www.3gpp.org/ftp/Specs/latest/Rel-16/33_series/

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  • $\begingroup$ Can you expand your acronyms to make the question easier to read? $\endgroup$ – Mike Ounsworth Oct 16 '19 at 19:54
  • $\begingroup$ EPS: Evolved Packet System $\endgroup$ – Tarun Mittal Oct 21 '19 at 16:18
  • $\begingroup$ EEA/EIA: EPS Encryption/Integrity Algorithm $\endgroup$ – Tarun Mittal Oct 21 '19 at 16:18

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