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Question: Consider the following High-Level Message Sequence Chart and its components represented in the attached two files. Generate two MSCs included in the semantics of the High-Level Message Sequence Chart.

Answer:

Sure — here are two drawn MSCs (as renderable sequence-diagram drawings) corresponding to the HMSC semantics Lost* ; Delivered:

MSC 1 (k = 0): Delivered immediately
MSC 2 (k = 1): One Lost attempt, then Delivered

You can paste these into any Markdown viewer that supports Mermaid (e.g., many wiki systems, VS Code extensions, GitHub, etc.) to see them drawn.

MSC 1 — Delivered (no loss, k = 0)

sequenceDiagram

title MSC M0: Delivered (k=0)

participant Env as Environment

participant S as Sender

participant M as Medium

participant R as Receiver

Env->>S: Request

S->>M: Offer

M->>R: Forward

R->>Env: Deliver

R->>M: Ack1

M->>S: Ack2

S->>Env: Success

MSC 2 — Lost ; Delivered (one loss then success, k = 1)

sequenceDiagram

title MSC M1: Lost once, then Delivered (k=1)

participant Env as Environment

participant S as Sender

participant M as Medium

participant R as Receiver

rect rgb(245,245,245)

note over Env,S,M: Lost attempt

Env->>S: Request

S->>M: Offer

S->>S: Timer

S->>Env: Fail

end

rect rgb(235,255,235)

note over Env,S,M,R: Delivered attempt

Env->>S: Request

S->>M: Offer

M->>R: Forward

R->>Env: Deliver

R->>M: Ack1

M->>S: Ack2

S->>Env: Success

end

Want them in classic MSC layout?

If you tell me which notation you prefer (e.g., ITU Z.120-style MSC, SDL/MSC, or UML sequence diagram), I can redraw them with closer lifeline/event styling (including explicit message arrows, inline events, and termination bars).

Please redraw the second MSC (MSC 2).

Absolutely — here is a cleaner redraw of MSC 2 (the scenario Lost once, then Delivered) with clearer separation of the two phases and a more “MSC-like” visual structure.

MSC 2 (k = 1): Lost ; Delivered — Redrawn (Mermaid)

sequenceDiagram

title MSC 2 (k=1): One Loss, then Successful Delivery

participant Env as Environment

participant S as Sender

participant M as Medium

participant R as Receiver

%% --- First attempt: Lost ---

rect rgb(255,245,245)

note over Env,S,M: Attempt 1 — Lost

Env->>S: Request

S->>M: Offer

Note over S: Timer expires (timeout)

S->>Env: Fail

end

%% --- Second attempt: Delivered ---

rect rgb(245,255,245)

note over Env,S,M,R: Attempt 2 — Delivered

Env->>S: Request

S->>M: Offer

M->>R: Forward

R->>Env: Deliver

R->>M: Ack1

M->>S: Ack2

S->>Env: Success

end

What changed (so it “reads” better)

The timeout is shown as an explicit note over Sender (“Timer expires”) to visually match an internal event on the Sender lifeline.
The two phases are boxed separately (Attempt 1 — Lost, then Attempt 2 — Delivered) to reflect the HMSC concatenation of Lost ; Delivered.
Receiver is included as a participant for consistency but is only involved in the Delivered phase (as in your component MSCs).

If you’d like, I can redraw the same MSC in PlantUML (often closer to classic MSC/UML sequence diagram styling), or in a Z.120-style textual MSC format with explicit per-instance event ordering.