Page 1023 - 5G Basics - Core Network Aspects

Transport aspects 2

The DPU controls the state of the NT through a series of commands specified in clause S.4. For example, an
NT in state S3 will transition to state S4 upon receipt of the activate (1) command. The specified commands
are start download, download section, end download, activate image and commit image.

NOTE 1 – In Figure S.3, states S1 and S2 (and S1' and S2') are distinguished only for convenience in understanding the flow. Upon
receipt of a start download message, and particularly when the NT reboots, any partial downloads in progress are discarded.
NOTE 2 – In Figure S.3, state transitions occur when any of the listed actions occur.

Figure S.3  Software image state diagram

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