Page 1012 - 5G Basics - Core Network Aspects

2 Transport aspects

Bit 6, acknowledge request (AR), indicates whether or not the message requires an acknowledgement. An
acknowledgement is a response to an action request. If an acknowledgement is expected, this bit shall be
set to 1. If no acknowledgement is expected, this bit shall be set to 0. In messages sent by the NT, this bit
shall be set to 0.

Bit 5, acknowledgement (AK), indicates whether or not this message is an acknowledgement to an action
request. If a message is an acknowledgement, this bit shall be set to 1. If the message is not an
acknowledgement, this bit shall be set to 0. In messages sent by the DPU, this bit shall be set to 0.

Bits 4..0, message type (MT), indicate the message type, as defined in Table S.1. Values not shown in the
table are reserved by ITU-T.

Table S.1  NT software management message types

MT Type Purpose AR AK
30 Get software image DPU requests one or more attributes of a managed 1 0
software image instance from the NT.
Get software image NT provides the attributes of a managed software image 0 1
response instance requested by the DPU
19 Start software DPU requests to start a software download 1 0
download
Start software NT acknowledges that a software download may start 0 1
download response
20 Download section Download a section of a software image Note No

Download section NT acknowledges reception of last section within a 0 1
response window

21 End software download End of a software download action 1 0
End software download NT informs the DPU whether the download command 0 1
response was successful or not
22 Activate software DPU requests the NT to activate the indicated software 1 0
image under the provided condition
Activate software NT informs the DPU whether the activate software 0 1
response command was successful or not
23 Commit software DPU requests the NT to commit the indicated software 1 0
image
Commit software NT informs the DPU whether the commit software 0 1
response command was successful or not
NOTE 1 – The download section action is acknowledged only for the last section within a window. See clause S.6.

S.4.3.3 Get software image and get software image response messages
The get software image and get software image response messages are used to transfer attributes of
software image instances from the NT to the DPU.

For an attribute mask, a bit map is used in the get software image and get software image response
messages. This bit map indicates which attributes are requested (in the case of get software image) or
provided (in the case of get software image response). The bit map is composed as given in Table S.2.

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