Browse Prior Art Database

Mobile Network Tracing (RFC2041)

IP.com Disclosure Number: IPCOM000002596D
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 21 page(s) / 60K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Noble: AUTHOR [+4]

Abstract

Mobile networks are both poorly understood and difficult to experiment with. This RFC argues that mobile network tracing provides both tools to improve our understanding of wireless channels, as well as to build realistic, repeatable testbeds for mobile software and systems. The RFC is a status report on our work tracing mobile networks. Our goal is to begin discussion on a standard format for mobile network tracing as well as a testbed for mobile systems research. We present our format for collecting mobile network traces, and tools to produce from such traces analytical models of mobile network behavior.

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Network Working Group B. Noble

Request for Comments: 2041 Carnegie Mellon University

Category: Informational G. Nguyen

University of California, Berkeley

M. Satyanarayanan

Carnegie Mellon University

R. Katz

University of California, Berkeley

October 1996

Mobile Network Tracing

Status of this Memo

This memo provides information for the Internet community. This memo

does not specify an Internet standard of any kind. Distribution of

this memo is unlimited.

Abstract

Mobile networks are both poorly understood and difficult to

experiment with. This RFC argues that mobile network tracing

provides both tools to improve our understanding of wireless

channels, as well as to build realistic, repeatable testbeds for

mobile software and systems. The RFC is a status report on our work

tracing mobile networks. Our goal is to begin discussion on a

standard format for mobile network tracing as well as a testbed for

mobile systems research. We present our format for collecting mobile

network traces, and tools to produce from such traces analytical

models of mobile network behavior.

We also describe a set of tools to provide network modulation based

on collected traces. Modulation allows the emulation of wireless

channel latency, bandwidth, loss, and error rates on private, wired

networks. This allows system designers to test systems in a

realistic yet repeatable manner.

1. Introduction

How does one accurately capture and reproduce the observed behavior

of a network? This is an especially challenging problem in mobile

computing because the network quality experienced by a mobile host

can vary dramatically over time and space. Neither long-term average

measures nor simple analytical models can capture the variations in

bandwidth, latency, and signal degradation observed by such a host.

In this RFC, we describe a solution based on network tracing. Our

solution consists of two phases: trace recording and trace

modulation.

In the trace recording phase, an experimenter with an instrumented

mobile host physically traverses a path of interest to him. During

the traversal, packets from a known workload are generated from a

static host. The mobile host records observations of both packets

received from the known workload as well as the device

characteristics during the workload. At the end of the traversal,

the list of observations represents an accurate trace of the observed

network behavior for this traversal. By performing multiple

traversals of the same path, and by using diff...