A Heterogeneous Approach for Wireless Network Simulations

Transcription

1 A Heterogeneous Approach for Wireless Network Simulations Jens Voigt 0062 : (+49) : (+49) : voigtje@ifn.et.tu-dresden.de. Motivation: System Simulations of Mobile Cellular Networks 2. Wireless Network Simulator: Overview 3. Choosing a Model of Computation: Specifics of Mobile Cellular 4. Application: Simulation of a 60 GHz Indoor System 0 UC Berkeley, 2/9/99 System Simulations for Mobile Cellular Networks a network operator... has many users limited number of resources must re-use the resources causes interferences wants to offer quality capacity needs buys to balance the scales a Wireless Network Simulator (WiNeS) UC Berkeley, 2/9/99

2 Wireless Network Simulator () Overview simulator system-module (GSM) WiNeS-core-classes (interface definitions) system-module (60 GHz indoor) WinesBaseInStar DEStar* myparent_p getparent() NetworkElement Channel WinesBase isa() getclassname() WinesBaseInNE WinesBaseInChannel NE* myparent_p Channel* myparent_p getparent() getparent() BaseMovement BasePropagation animation ExtSendQ myreadq ExtSendQ myanswerq ExtSendQ mywriteq handlereads()... system-module (UMTS) -unsign. int mynum. -Position myposition getnumber() getposition() setnumber() handleanswers() InternSource RefireQ myrefireq IntSendQ mytriggerq handlerefire() handlewrites() ExternSource RefireQ myrefireq ExtSendQ mynewneq handlerefire() BaseAntenna BaseNetworkAccess BaseModem BaseResourceOccupat. simulator simulation control (Ptolemy-DE) 2 UC Berkeley, 2/9/99 Wireless Network Simulator (2) Object-Oriented Analysis network inherent activities 0...n resource maintenance data stream generator backbone network... n network element with fixed access activation 0... instantiates...* movement user activities modem network element antenna resource usage 0...n network access radio wave propagation resource allocation transmission resource occupation environment 3 UC Berkeley, 2/9/99

3 Model of Computation () Multiple Layer Model system backbone network activation all network elements network element (prototype) element imperative programming (WiNeS-classes) component other design environments (SDF, FSM,...) other tools (Matlab, SDT,...) Model of Computation can be different in each layer 4 UC Berkeley, 2/9/99 Model of Computation (2) Events on System Layer backbone network many synchronous events network elements activation a few random events (e.g. poisson distributed) NE Core component component 2 event-tags need not to be totally ordered through all layers 5 UC Berkeley, 2/9/99

4 Model of Computation (3) parallel one transmission many network elements Channel Access ordered in time multiple access technique technique logical control s (e.g. a measure cycle) cell cell 2 cell 3 sequential access as sequential process cyclic an event cycle occurs 6 UC Berkeley, 2/9/99 Model of Computation (4) synchronous timed system Alternatives communicating sequential processes discrete event MoC synchronous language CSP/π-/Fusion-calculus mutable system possible overspecifies model if applied in all layers run-time scheduling (overhead 0%) sequential DE has performance limits parallelization hard to implement fits for random events works fine fast compile time scheduling number and order of events must not change mutable system random activation fits for access not tried yet automatic scheduling based on rendezvous mutable system and concurrency inherent in the model non-determinism use event cycle to get determinism? not tried yet 7 UC Berkeley, 2/9/99

5 hallway Connection between Ptolemy and System-Modules Ptolemy stars as scheduler interface MoC dependent star calls methods in members 0...n porthole WiNeS-Core defines interfaces member System-Module implements methods interface definitions in WiNeS-core are independent of MoC 8 UC Berkeley, 2/9/99 Application: 60 GHz System Module base station research project: hallway base station base station hallway campus 60 GHz each room == one cell system simulations in Generic Office Environment radiowave prediction by incorporated on-line Radiowave Propagation Simulator (RPS) different activation and mobility models 9 UC Berkeley, 2/9/99

6 60 GHz System Module () Layout simulator (VEM) RPC simulation (Ptolemy 0.x) system layer 0 UC Berkeley, 2/9/99 60 GHz System Module (2) System Configuration Base-Stations: HOFMap Mobile Stations: DEDynMap system element layer UC Berkeley, 2/9/99

7 60 GHz System Module (3) On-line Animation and Trace traced mobile resource occupation interference simulation (C++-Ptolemy 0.x) CORBA animation (Java-Swing and PtPlot) link quality radiowave rays mobile s path 2 UC Berkeley, 2/9/99 Summary and Future Work - heterogeneous approach in three senses: - different mobile cellular systems are modeled in different system modules - use of a Multiple Layer Model allows for a different MoC in each model layer - Event-Cycle for access allows for different MoC on system layer and simplifies parallelization - ready to use: - two system modules (GSM and 60 GHz indoor) - simulation control: Ptolemy Discrete-Event Domain - on-line animation written in Java and connected via CORBA - simulator via Ptolemy0.x-GUI - plans: - simulation control which allows for concurrency (first choice: base on PtolemyII - CSP / PI) - more generic GUI for animation/ (use of DIVA system visualization?) - new system modules: 3G-UMTS, 4G-research project (IBMS) 3 UC Berkeley, 2/9/99