Browse Prior Art Database

Wireless Transmission Cell Boundary Detector

IP.com Disclosure Number: IPCOM000113719D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Dahl, S. S.: AUTHOR

Abstract

A method to signal the mobile notebook user that the user has roamed to the outer limits of a wireless LAN cell is disclosed. The user is kept informed at this boundary condition that any further movement from the base station will result in a lost session.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 95% of the total text.

Wireless Transmission Cell Boundary Detector

      A method to signal the mobile notebook user that the user has
roamed to the outer limits of a wireless LAN cell is disclosed.  The
user is kept informed at this boundary condition that any further
movement from the base station will result in a lost session.

      Today, the cursor is a function of where the next character
will be placed on the station's screen.  The function of the cursor
can be enhanced by indicating the mobile (station) unit's
Signal-to-Noise (S/N) ratio.  To provide this capability, the
station's S/N function is used as an input the cursor's
characteristics.  A high S/N ratio indicates the mobile unit is
within its transmission boundaries.  However, as the distance between
the mobile unit and the access point increases, the S/N ratio
decreases.  At some physical distance, the signal will be
undistinguishable from the background noise and LAN connection will
be lost.

      By using the station's S/N measurement, the cursor's shade or
color will be proportional to this measurement.  When the S/N ratio
is high, the cursor intensity will have a bright tone.  As the S/N
ratio decreases, the cursor intensity will diminish to a lighter
tone.  Should the station's wireless apparatus detect a S/N ratio
where the LAN connection will be lost at any moment, the cursor will
take on a color tone or a particular blinking characteristic to
indicate to the station's user the boundary has been reac...