Mission Operations Reference Model. Draft ... - CCSDS

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DRAFT RECOMMENDED PRACTICE FOR MISSION OPERATIONS REFERENCE MODEL3 MO CONTEXT AND CONCEPTS3.1 OVERVIEWThis section defines the context of a MO service deployment and extends the conceptsoutlined in section 2.3.2 SERVICE CONTEXTA deployment of a MO service is defined as consisting of two aspects, a service provider ofthe MO service and a consumer of that service:Service ConsumerServiceService ProviderFigure 3-1: Basic MO Service Deploymenta) The MO service concept does not define or limit the locations of the two aspects. Aslong as the two aspects can communicate with each other using the relevantcommunications transport, then they may interact.b) The service provider can be located wherever is appropriate for the deployment, be iton ground inside a control system or at another ground facility, at the ground stationitself, onboard an orbiting spacecraft or even onboard a deep space craft or lander.The same applies for the service consumer.c) The two aspects are also not required to be in separate locations. The conceptsupports ground-to-ground, onboard-to-onboard and space-to-space deployments aswell as the more traditional ground-to-space deployments.d) A service consumer interacts with a service provider through the exchange of servicemessages (referred to as messages from this point onwards). (See 3.4 for furtherexplanation.)NOTE – It should be noted that other aspects of a system, such as access control, mayprevent communications, but the concept does not limit it by definition.<strong>CCSDS</strong> 520.1-R-1 Page 3-1 October 2009
DRAFT RECOMMENDED PRACTICE FOR MISSION OPERATIONS REFERENCE MODEL3.3 SERVICE DECOMPOSITIONThe MO service consumer and provider components are decomposed as follows, withequivalent layers on both sides:ConsumerApplicationProviderApplicationConsumer MOService LayerProvider MOService LayerConsumer AccessControlConsumer MALProvider MALProvider AccessControlConsumerMessage TransportProvider MessageTransportFigure 3-2: Layered MO Service Decompositiona) Consumer Application. Consumes the services provided by the service provider.b) Consumer MO Service Layer. Responsible for converting from the genericmessages provided by the MAL abstract service below it to the service interfaceexposed to Consumer Application.c) Consumer MAL. Provides the standard messaging service that is used by the MOService Layer to communicate with its service provider peer. All messagestransported by the MAL are passed via a Consumer Access Control component via astandard abstract interface.d) Consumer Access Control. Implements a standard service interface defined by theMAL and provides access control to services from the consumer point of view. It canreject messages or augment with security credentials any messages that pass throughthe MAL. The actual access control policy in place is deployment specific.e) Consumer Message Transport. Implements a standard message transport interfacedefined by the MAL for the transport of messages from a source to a destination. It isresponsible for converting the message from the language-specific representation tothe wire-level representation required for that transport. Combines both the relevantmessaging aspect (most probably a COTS) and an adaptation from the MAL interfaceto that software.<strong>CCSDS</strong> 520.1-R-1 Page 3-2 October 2009
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