Table of Contents
Advertisement
Départ. Technical support- CM640
PHILIPS Consumer
Communications
Centre du Mans
In contrast, in truly ad hoc systems, there is no difference between radio units; that is, there are no distinctive base
stations or terminals. Ad hoc connectivity is based on peer communications. There is no wired infrastructure to
support connectivity between portable units; there is no central controller for the units to rely on for making
interconnections, nor is there support for coordination of communications. In additions, there is no intervention of
operators. For scenarios envisioned by bluetooth, it is likely that a large number of ad hoc connections will coexist
in the same area without any mutual coordination; that is, tens of ad hoc links must share the same medium at the
same location in an uncoordinated fashion.
For bluetooth application typically many independent network overlap in the same area. This is called a scatter ad
hoc environment. Scatter ad hoc environments consist of a multiple networks, each containing only a limited
number of units. The difference between a conventional cellular environment, a conventional ad hoc environment,
and a scatter ad hoc environment is illustrated below :
Topologies for: a) cellular radio systems with
squares representing stationary base stations;
b) conventional ad hoc systems; and c) scatter
ad hoc systems.
Ad hoc radio system have been in use for some time, for example, walky talky systems used by the military, police
fire departments and rescue teams in general. However, the Bluetooth systems is the first commercial ad hoc radio
system envisioned to be used on a large scale and widely available to the public
PHILIPS ELECTRONICS N.V. 1999
All rights reserved. Reproduction in whole
or in part is prohibited without the written
consent of the copyright owner.
PROCEDURE
Service Repair Support
COMPANY RESTRICTED
VY-V-640-82x
Page : 23 of 71
Langue : EN
Date : 25/02/03
VY-V-640-82x
Advertisement
Table of Contents
