[Css-csts] CSTSWG action item #04-1010F: Started and Acknowledged Procedures

[John Pietras]

CSTS WG colleagues ---

 

CSTSWG action item #04-1010F calls for an assessment of whether "it
makes sense to distinguish between started procedures and acknowledged
procedures." Based on my study of the problem, it is possible and, in my
opinion,desirable to remove the designation between started procedures
and acknowledged procedures. I have prepared a technical note presenting
a proposed approach for eliminating this distinction in the FW (and
subsequently, the Guidelines). The technical note is on the CWE at URL

 

http://cwe.ccsds.org/css/docs/CSS-CSTS/CWE%20Private/technical%20Notes/S
tartedAndAcknowledgedProcedures-110120.doc

 

or http://tinyurl.com/StartedAndAckedProcedures

 

To summarize the approach: the main purpose for making this distinction
(Started and Acknowledged procedures) was to support the definition of
service state machines for CSTSes with stateful prime procedure
instances. The proposed approach for eliminating this distinction, while
still providing enough information to drive the state of the service
instance, is based on having the prime procedure instance raise
'transition to active' and 'transition to inactive' events to the
Association Control procedure. The behavior and state machine of each
procedure type define how these events are triggered when that procedure
executes in the role of the prime procedure instance. The Association
Control procedure and the service instance itself do not need to know
the conditions under which the prime procedure instance transitions
between the two states, only that it has done so and the state
('active', inactive') to which it has transitioned.

 

The technical note outlines the essential changes that would occur if
this proposed approach is adopted. Not all of the detailed changes are
listed - to do so now would be premature. But if this approach is
adopted, a complete list of changes would of course have to be
identified and written.

 

I look forward to your reaction to this proposal.

 

Best regards,

John

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