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Advanced Modeling and Simulation of Communication Systems with Layered Protocols

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This document presents methodologies for modeling and simulating communication systems using multiple algorithms executed concurrently across processors. It outlines a structured approach where processes are organized into layered protocols, facilitating interactions via communication primitives. The descriptions include specifications for processors, communication systems, and environmental interactions using state machines. Furthermore, it details event propagation, configuration states, and execution sequences, aimed at optimizing process communication and enhancing the simulation of complex system behaviors.

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Advanced Modeling and Simulation of Communication Systems with Layered Protocols

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  1. Modeling Process proposed facility Set 14: Simulations • May be several algorithms (processes) runs on each processor to simulate the desired communication system. • For example, a processor run two algorithms (processes) at the same time • one process (algorithm) that uses the broadcast service • another process (algorithm) that implements the asynchronous broadcast system on top of the asynchronous point-to-point message-passing system

  2. Modeling Process (Cont.) Algorithm composition • Ordering of process, forming a “Stack of protocols” • Environment communicates with the top layer • Each process uses communication primitives to interact with the layer beneath it • The bottom layer communicates with the Communication System Set 14: Simulations

  3. modeled as a problem spec (interface & allowable sequences) layer 1 layer 2 layer 3 communicate via appropriate primitives: shared events modeled as a problem spec (interface & allowable sequences) Simulation for Modeling Process environment modeled as state machines communication system Set 14: Simulations Layered model

  4. layer 1 layer 2 layer 3 Simulation for Modeling Process (Cont.) environment Send Send Send Send communication system Set 14: Simulations Propagation of events

  5. Modeling Process Specifications (1) • A system consists of • A collection of n processors (or nodes), p0 through pn-1 • A communication system C linking the nodes • Environment E • Notes • Environment E and Communication system C are given as problem specifications • Node is a hardware notion • Running on each node are one or more processes • Processes are organized into a single stack of layers • The same number of layers on each node Set 14: Simulations

  6. Modeling Process Specifications (2) • Each process is state machine (modeled as an automaton) • Has a set of states, including a subset of initial states • Has hour kinds of events • Inputs coming in from the layer above (or the environment, if this is the top layer) • Outputs going out to the layer above • Inputs coming in from the layer below (or the communication system, if this is the bottom layer) • Outputs going out to the layer below • Events of type 1 and 2 form the top interface of the process • Events of type 3 and 4 form the bottom interface of the process Set 14: Simulations

  7. layer i - 1 layer i layer i + 1 Top interface of layer i 1 2 Bottom interface of layer i 4 3 Set 14: Simulations Propagation of events

  8. Modeling Process Specifications (3) • Events • Concepts • An event is said to be enabled in a state of a process if there is a transition from that state labeled with that event • Inputs from the environment and from the communication system are called node inputs • A configuration of the system specifies a state for every process on every node • A configuration does not include the state of the communication system • An initial configuration contains all initial states

  9. Modeling Process Specifications (4) • An execution of the system is a sequence C0 e1 C1 e2 C2 … of alternating configurations Ciand events ei • If it is finite, ending with a configuration • Satisfies the following conditions • Configuration C0 is an initial configuration

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