Space Link Extension - Service Management - CCSDS

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DRAFT RECOMMENDED STANDARD FOR SPACE LINK EXTENSION SERVICE MANAGEMENT 3 SLE SERVICE MANAGEMENT DOCUMENT EXCHANGE 3.1 GENERAL SLE-SM operations are realized through the execution of procedures that involve the exchange of messages that are contained within SLE-SM documents. All exchanges of SLE- SM messages conform to a document exchange protocol that ensures that a) operations are invoked only by entities that are authorized within the scope of a given Service Agreement; b) documents are validated as properly formatted SLE-SM documents; c) documents that are not properly formatted SLE-SM documents are handled in a context-appropriate manner; and d) messages contained within SLE-SM documents are processed in the proper sequence. The SLE-SM document exchange protocol operates across a communication service connecting UM and CM. Because SLE-SM is intended to operate using a variety of transport technologies (e.g., email, Transmission Control Protocol [TCP] connections, HyperText Transfer Protocol [HTTP], Simple Object Access Protocol [SOAP]), the details of the establishment and maintenance of the communication service are specific to transport technology used. However, all underlying communication services must perform a minimum set of functions in order to support the proper operation of the SLE-SM document exchange protocol. In a bilateral agreement, a UM and a CM must select a communication service that performs the required functions; this Recommended Standard does not cover such arrangements. Figure 3-1 illustrates the relationship between the underlying communication service, SLE- SM document exchange protocol, SLE-SM message type, and SLE-SM operation procedures. Subsection 3.2 describes the functions of the underlying communication service. Subsection 3.3 defines the SLE-SM document exchange protocol. Subsection 3.3.3.1 defines the SLE-SM operation procedure patterns. Each SLE-SM operation procedure uses one of three operation procedure patterns: two-phase operation, three-phase operation, or notified operation, which are specified in 3.1, 3.4.2, and 3.4.3, respectively. These operation procedure patterns employ combinations the SLE-SM message types (invocation, return, notification, and confirmation) to exchange the information in support of the procedures. CCSDS 910.11-R-2 Page 3-1 March 2008
DRAFT RECOMMENDED STANDARD FOR SPACE LINK EXTENSION SERVICE MANAGEMENT SLE-SM Operation Procedure W (2 Phase) two-phase operation procedure pattern SLE-SM Operation Procedure X (3 Phase) SLE-SM Operation Procedure Y (3 Phase) three-phase operation procedure pattern SLE-SM Operation Procedure Z (Notified) notified operation procedure pattern invocations and returns notifications and confirmations SLE-SM document exchange protocol SLE-SM message sets authenticated, recognized source identification SLE-SM exception responses underlying communication service Figure 3-1: Relationship among SLE-SM Operation Procedures, Document Exchange Protocol, and Underlying Communication Service 3.2 UNDERLYING COMMUNICATION SERVICE The underlying communication service is used to exchange SLE-SM documents among SLE- SM application entities. The underlying communication service maintains the relationship among each SLE-SM application entity and the identification of the ports through which it communicates with other SLE-SM application entities. The underlying communication service establishes and maintains the communication association between each pair of communication entities. NOTE – The underlying communication service may be built upon connectionless protocols such as UDP or SMTP, but if so then the underlying communication service must include a ‘sublayer’ that maintains the association. Alternatively, if no such automated association maintenance capability is provided by the underlying communication service itself, the communications association has to be established, maintained, and terminated by manually executed procedures. At a minimum, the underlying communication service must authenticate the Source of each document carried by the service and validate that the Source is recognized by the Destination as an entity that is permitted to send documents to it. As used in this Recommended Standard, Source and Destination refer to the communicating entities as they are known to the underlying communication service. Documents for which the Source cannot be authenticated and recognized are dropped by the communication service. There is no requirement on the underlying communication service to notify the Source when a document is dropped because of failure to authenticate the Source or recognize it on behalf of the intended Destination. Only when the underlying communication service authenticates the Source and recognizes it as a legitimate Source for the intended Destination does it deliver the document to the Destination. CCSDS 910.11-R-2 Page 3-2 March 2008
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Space Link Extension - Service Management - CCSDS

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