BS ISO 21082:2016 pdf download

BS ISO 21082:2016 pdf download.Mission operations — MAL space packet transport binding and binary encoding
2 OVERVIEW
2.1 GENERAL
This Recommended Standard allows MO services defined in terms of the MAL to interoperate across an end-to-end communication link using a normative binding of the MAL abstractions to the Space Packet Protocol for exchanging messages. This is of particular interest for MO services that are deployed across the space-ground link, for instance when the MO service provider is located onboard a spacecraft and the consumer on the ground. The messages that the provider and consumer exchange to implement the MO services are encoded in Space Packets and carried via the Space Packet Protocol, which acts as a Message Layer mapping. This can run directly over a space Data Link Layer or over a true Transport Layer such as TCP, UDP, or BP. To achieve this, this Recommended Standard provides a technology mapping of the MAL transport interface, the MAL abstract message, and the MAL data types specification (reference [2]) to the Space Packet Protocol (reference [1]). This technology mapping requires the specification of a concrete encoding format that is compliant with the Space Packet Protocol and that maps MAL header fields to SPP primary and secondary header fields.
The MAL Blue Book (reference [2]) defines an abstract transport interface as a set of request and indication primitives. A technology mapping specifies how these primitives are provided according to the messaging technology. In particular, a technology mapping translates the MAL message model into one or several specific PDUs in compliance with the protocol used by the messaging technology. Moreover, a technology mapping casts the MAL data types into a specific encoding format. In this binding specification a binary encoding is used. Other encodings, such as XML, are also possible. Full interoperability of services is achieved only once a binding has been created to a specific messaging technology. Because all MO service specifications are defined in terms of MAL using a formal service description language, a technology mapping must be used to bind the abstract service specifications to a specific messaging technology. This document specifies the mapping of the MAL abstractions to the CCSDS SPP. The diagram shown in figure 2-1 presents the set of standards documentation in support of the Mission Operations Services Concept. This book belongs to the technology mappings documentation.