Sys Ml Poster5x
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Using SysML modeling, the authors modeled a highway control system to link operational requirements to the design of an LTE wireless network. Key aspects of the model-based systems engineering approach included: (1) eliciting operational requirements and mapping them to system elements in the SysML model, (2) using parametric diagrams to connect radio link budget calculations to requirements, and (3) allowing tradeoff analysis by linking design parameters like camera resolution and frequency bandwidth to operational constraints. This integrated modeling approach improves design quality and reusability compared to document-driven processes.
Sys Ml Poster5x
- 1. Using Modelling Tools for Highway Control Operations Padma Kamath and Michael Liem Alcatel-Lucent Introduction Method Results Conclusions The Systems Engineering process is executed within the SysML Model. The model The SysML model allows linking of Operational requirements to individual model The model based approach enforces a high level of rigor in the description of the ABSTRACT becomes more detailed as each phase is executed. elements. By using Parametric Diagrams in the model, the dimensioning of the LTE system. It allows describing the operational scenarios thoroughly before making Highway traffic control systems can be considered as complex. Often the Systems that network through the Radio linkbudget can be connected to the requirements. architecture and technology decisions. We were able to link operational properties to are built do not meet operational requirements fully. A SysML based Engineering Requirement Analysis Phase the verification of the design decision for the Wireless LTE technology. The verification approach is proposed for building a Highway Control System. We demonstrate how Elicitation of operational requirements was done directly within the system model by using parametric diagrams. Even though the Telecom Network Design (here LTE) will be linked in the model to the operational Mapping to the System requirements Transmit Power The linkbudget determines the Max UE transmit Power Losses the telecommunication system is transparent to the rest of the system in most requirements to achieve an optimal Design solution. Requirements become elements in the Maximum Allowable and Margins Maximum Path Loss (MAPL) Pathloss cases, the concept of parametric diagrams within SysML allows connecting network model. Interference margin Gains With a radio propagation formula the capacity and dimensioning aspects directly to operational requirements of the extra cell interference Poor User Requirement Elicitation Mixing Requirements and Design Gains - Losses- Margins Reference Sensitivity inter-site distance can be determined applications which use the network. ‘Black Box’ View ‘White Box’ View Reference Sensitivity Interference cell radius System Designs often fail because of •= MAPL Poor involvement by operations people MAPL j dB = PMaxTX dBm + Txgain dB − Txloss dB PL = K1+K2 log (R) Operational Requirements Operational Requirements System Requirements System Design Non separation of Requirements and System features are grouped into Use + Rxgain dB − Rxloss dB − Bodyloss dB Derive Requirements for LTE Network − Penetration dB − Sensitivity dBm Where: Document Driven Error Prone Process No Requirement traceability Solution Cases − Interferen ceMargin dB K1: 1km path loss Error prone processes Only the principal Use case is considered − ShadowingM argin dB + HOGain dB K2: Path loss exponent Lack of requirements traceability here + FSSGain dB System LTE Network Design System Model Model LTE Network Design MBSE MBSE Systems Engineering process The Linkbudget formula will be according to ISO/IEC 15288 Proper Systems Engineering process implemented in the SysML model (see Requirement System Analysis is key for Design quality. This includes: Process Input Analysis and Control (Balance) diagram on the right) System Design System Design Requirements Requirement Analysis Loop Functional Analysis Functional Analysis Phase Verification that LTE supports a given Functional Analysis and Allocation Design The System is considered as a “Black bandwidth is also implemented (see Design Synthesis Verification Loop Design Process Box” diagram below ) Synthesis Output System behavior is described using This integrated Design approach has a high potential for re-usability of models and Flow charts (Activity Diagram) should reduce the effort for design and improve the design quality. Requirement SysML Model Validation & Model Based Systems Engineering Message sequence Diagrams are Acceptance Analysis with SysML is the state-of-the-art in generated automatically (not shown) The CCTV camera throughput is linked Functional Verification Systems Engineering System Functions and Operations are defined to the inter-site distance (see diagram on Bibliography Analysis The diagram on the left shows it as the left) applied to the Design of a Highway The “Black Box” model can be executed 1.Friedenthal,S.,Moore,A., Steiner,R.,A Practical Guide to SysML, OMG Press; 2009 Design Synthesis Implementation for validation Also the number of CCTV cameras and Control System the length of the highway is also linked to 2.Hoffmann, H.-P., Deskbook - Model based Systems Engineering with Rational the linkbudget Rhapsody and Rational Harmony for Systems Engineering, IBM, 2010 Weather Sensor Design Synthesis Phase 3.Lescuyer, P., Lucidarme, T., Evolved Packet System (EPS): The LTE and SAE Central Control The System Architecture is defined. Evolution of 3G UMTS, John Wiley & Sons, Chichester, UK, 2008. (see System Block Diagram) Using a mathematical solver (e.g. Maxima or Mathematica) we can now trade-off 4.Papageorgiou,M., Papamichail,I., Handbook of Ramp Metering, EuropeanRamp Highway Control System used for our Wireless BaseStation Operations and functions are camera resolution against required frequency bandwidth against number of sites. We Metering Project, 2007 study consists of the following: allocated to Subsystem elements have linked key dimensioning parameters through the SysML model to operational 5.IEEE1220 - Standard for Application and Management of the Systems Engineering Ramp Metering with CCTV as traffic Speed Limit/Lane Gates “White Box” message sequence constraints. One could further link the camera resolution to the parameters of the Ramp Process, 2005 sensor CCTV traffic flow Diagrams are generated Metering algorithm such as maximum speed. LTE Wireless networks to interconnect Parametric Diagrams are defined to elements of the system Ramp Signal do trade-off Analysis (see results)