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ISO 15628:2013 is named application layer, although it does not cover all functionality of OSI Layer 7 and it includes functionality from lower layers.
It uses services provided by DSRC data link layer, and covers functionality of intermediate layers of the OSI Basic Reference Model (ISO/IEC 7498-1).
The following subjects are covered by ISO 15628:2013:
a) application layer structure and framework;
b) services to enable data transfer and remote operations;
c) application multiplexing procedure;
d) fragmentation procedure;
e) concatenation and chaining procedures;
f) common encoding rules to translate data from abstract syntax ASN.1 (ISO/IEC 8824-1) into transfer syntax (ISO/IEC 8825‑2:2002) and vice versa;
g) communication initialisation and release procedures;
h) broadcast service support;
i) DSRC management support including communication profile handling; and
j) extensibility for different lower layer services and application interfaces.
It is outside the scope of ISO 15628:2013 to define a security policy. Some transport mechanisms for security-related data are provided.