SGSS Extensions to and Modifications of CCSDS Space Communication Cross Support Service Management...

SGSS Extensions to and Modifications of CCSDS Space Communication Cross Support

Service Management

15 - 19 October 2012

John PietrasGlobal Science and Technology, Inc, Greenbelt, MD, USA

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SCCS-SM LifecycleCo

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Service Catalog

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Service Agreement Development

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Service Planning and Scheduling

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Service Package Execution

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Service Package Result

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Service Accounting

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Service Agreement Period

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SCCS-SM Lifecycle Addressed by SCCS-SM Blue-1

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SCCS-SM Lifecycle Addressed by SGSSCo

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Service Agreement

SGSS adds a new information entity – the Mission Profile

Conceptually could be considered part of the Service Agreement

SGSS Service Agreement will be extended to address SN/SGSS-specific details

E.g., PN coding

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Configuration Profiles

SGSS excludes the standard add and delete operations but includes a new modify operation

Modify is essentially the same as add but the total number and names are constrained

Space Communication Service Profile GD is extending the existing CCSDS 401-based Space Link Carrier

profiles (and agreements) to include CDMA parameters Possible alternative for CCSDS Next Gen SM would be to base

configuration profiles on CCSDS Data Transmission an PN Ranging for 2 GHz CDMA Link for Data Relay Satellite Blue Book, which already standardizes a subset of SN RF modulation terminology

Support for IP over CCSDS• Current ICD based on draft material provided by SGSS-Standards liaison

Support for IP over HDLC will still be required• No reference specification for IP over HDLC

SLE Transfer Service Profiles ROCF EFCLTU

www.ccsds.org

Service Packages (1 of 3)

SGSS replaces the CCSDS Service Package Request with the Flexible Service Package Request

Increased flexibility in scheduling Scheduling windows

• A series of time-defined windows that specify when the requested Service Package can be scheduled

Resource constraints• Allow multiple types/instances of SN resources to be specified as required, preferred,

acceptable or unacceptable o Generalization of SCCS-SM antenna selection

Recurring schedule requests A form of rule-based scheduling in which the rules are conveyed as part of a

recurring schedule request SGSS does not use CTSP operation

Service Package Request organized as one or more Event requests (new SGSS capability)

Wait listing UM can flag a service request to be put on a wait list if it cannot be scheduled

during the initial scheduling attempt CM will attempt to schedule the request until the wait list expiration time specified

in the service request

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www.ccsds.org


Alternatives Allows Event requests within a Service Package request to be linked

such that if the first request in the chain cannot be scheduled, the alternatives will be followed until one can be scheduled or the end of the chain is reached

Allows Space Communication Service requests within an Event request to be linked for alternative selection

Specification of timing relationships among services in service request

Coupled to the start time of another service Bound to be within the period of another service

Specification of timing relationships among Events in service request

Coupled to the start time of another Event Bound to be within the period of another Event

Use freeze interval for Service Package modification

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Waitlisting and recurrent requests change semantics of Create Service Package Successful Return and Service Package Modified

In CCSDS 910.11, a successful return (SR) is used to indicate that a Service Package has been successfully scheduled

In SGSS extended CCSDS-SM, an SR is returned under any of the following conditions

• A specific time type Service Package has been successfully scheduled`• A specific time type Service Package Request has not been scheduled but has

been waitlisted• One or more occurrences of a recurrent time type Service Package have been

successfully scheduled• No occurrences of a recurrent time type Service Package have been successfully

scheduled for the current scheduling period, but the request is still valid for future scheduling periods

In extended CCSDS-SM, the Service Package Modified operation is being extended to be used when:

• A Service Package Request has come off the waitlist and onto the schedule• A Service Package has been scheduled based on a recurrent request

In extended CCSDS-SM, the Service Package Cancelled operation is being extended to be used when a waitlisted Service Package Request fails to be scheduled by the latest possible time for scheduling the request

Query Flexible Service Package operation is extended to allow multiple Service Packages to be retrieved

Used to convey the Active Schedule to users


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SCCS-SM Information Entities and Management Services: Trajectory Predictions

A Trajectory Prediction defines the course of the mission (user/customer) spacecraft over a period of time

A Trajectory Prediction can be either: A single state vector to be propagated A set of vectors that form an ephemeris State vectors and ephemeris data conform to Orbit Data

Messages, CCSDS 502.0-B-2

Trajectory Prediction service (optional) Used to add, delete, and extend trajectory prediction

information

www.ccsds.org

SCCS-SM Supports Different Uses and Operations Concepts for Trajectory Predictions

Trajectory predictions have different uses in different TT&C networks

DSN uses different grades of trajectory predictions for long-range planning and view-period generation as well as generation of actual spacecraft acquisition data (pointing angles, Doppler compensation offsets, etc.)

SN equivalent of Trajectory Predictions (IIRVs) are currently used for spacecraft acquisition data generation

• View period information is supplied via TSWs supplied by the MOCs

The Trajectory Prediction Service supports multiple operational profiles for updating predicted trajectories

DSN generates a specific trajectory prediction (state vector or ephemeris) for each Service Package

• Service Packages are tightly coupled to individually-identified Trajectory Predictions

SN and NEN update predicted trajectories asynchronously with respect to requested/scheduled Service Packages

• Trajectory predictions are appended to the running trajectory, dropped off after their time of applicability

• The TT&C network (e.g., SN) uses the running trajectory to generate pointing angles, Doppler compensation, etc., to support Service Packages

www.ccsds.org

Trajectory Predictions

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GD currently plans to have one default trajectory prediction for each spacecraft

MOC updates the single default TP via the Extend Trajectory Prediction ETP operation

ATP is not available to define the creator of the TP GD must either exempt TPs from ownership enforcement if ATP is not

used or specify default “owners” in the Service Agreement For contingency trajectory changes, MOC must provide updated vectors via

ETP in real time If MOCs are not be able to replace TPs quickly enough, SGSS may have

to implement ATP

Use of Query TP to retrieve Relay Satellite vectors SN must provide TDRS state vectors to user missions so that they know

where to point their spacecrafts’ antennas The TDRSs are given “well known” TPids and their vectors are then queriable

via the QTP

“Lack of Vector” notification (current DAS capability, to be extended to all Events/Service Packages in SGSS)

If Trajectory Prediction data is not available at TBD minutes before the start of execution of a Service Package, the “owner” is notified

www.ccsds.org

Planning Information

SGSS Query Planning Aid operation allows UM to request: TDRS Unused Time Resource Unused Time TDRS visibility

• Generated by Flight Dynamics Facility and merely passed through SGSS Ground source RFI Mutual RFI

Calendar operations allow SGSS operators and users to add, delete, replace and query long-term items on an open, text-based calendar

Major maintenance operations Major mission phases (e.g., launch)

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www.ccsds.org

Real-time Service Monitor and Control

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CCSDS’ current plans are to implement real-time service monitoring and control via SLE-like Cross Support Transfer Services (CSTSes):

Monitored Data CSTS Service Control CSTS

No plans in CCSDS to add monitor and control operations to SCCS-SM XML message interface

SGSS E-06 ICD adds new monitor and control operations top to the SM XML message interface

Apply Change to Service Package Apply Service Package Reconfiguration Request Service Package Schedule Status Report Service Package Status Report

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Service Accounting

SGSS - User MOC ICD includes the following new operations: Find Stored Reports Get Stored Report Delete Stored Report Generate Dynamic Report

Report types are currently TBD

www.ccsds.org

Service Agreement and Configuration Profile Service Operations Summary Comparison

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SCCS-SM-B-1 operations

Legend: Essentially equivalent Requires extension Not required by SN/SGSS new with SN/SGSS

Query Service Agreement

Add Space Communication Service Profile

Query Space Communication Service Profile

Add SLS Transfer Service

Profile

Add Retrieval Transfer Service

Profile

Query Transfer Service Profile

Delete Space Communication Service Profile

Delete Transfer Service Profile

Add Space Link Events

Profile

Query Space Link Events

Profile

Delete Space Link Events

Profile

Query Service Agreement

Different detailed service agreement

content

Different detailed configuration

profile content

No new profiles can be created, only modified

Query Space Communication Service Profile

Different detailed

configuration profile content

SGSS version combines SLS and Retrieval

SGSS version combines SLS and Retrieval



ROCF and EFCLTU profiles

added

Query Transfer Service Profile

Update User Mission Profile

Query User Mission Profile

Update Space Communication Service Profile

Update Transfer Service Profile

www.ccsds.org 17

Service Package Planning, Scheduling, and Execution Operations

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Create Service Package (CSP)

Delete Service Package (DSP)

Replace Service Package (RSP)

Service Package Cancelled (SPC)

Query Service Package (QSP)

Service Package Modified (SPM)

Confirm Tentative Service Package

Select Alternate Scenario

Apply New Trajectory

Apply New Space Link Events Profile

recurrent requests

organized by events

service flexibility

freeze interval

waitlisting

alternative events and services

binding and coupling among events

optional services

Delete Service Package (DSP)

Replace Flexible Service Package (RFSP)

(same as for CFSP/CSP)

Service Package Cancelled (SPC)

Different detailed configuration profile

content

Multiple Service Packages (Active

Schedule)

Different detailed configuration profile

content

waitlisted requests

Apply Change to Service Package

Apply Service Package Reconfiguration

Query Planning Aid

Service Package Schedule Status Report

Service Package Status Report

Create Flexible Service Package (CFSP)

Query Flexible Service Package (QFSP)

Service Package Modified (SPM)

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Trajectory Prediction Service Operations Summary Comparison

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Extend Trajectory Prediction

Query Trajectory Prediction

Add Trajectory Prediction

Delete Trajectory Prediction

Extend Trajectory Prediction

Query Trajectory Prediction

May be needed

SGSS Extensions to and Modifications of CCSDS Space Communication Cross Support Service Management...

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