Browse Prior Art Database

Spectrum Re-use in a Wireless LAN

IP.com Disclosure Number: IPCOM000108434D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 55K

Publishing Venue

IBM

Related People

Chaudhuri, SR: AUTHOR

Abstract

Disclosed is a method to reduce the amount of collision among adjacent cells of a wireless local area network, and thereby to improve the use of the optical or radio-frequency spectrum. (Image Omitted)

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 78% of the total text.

Spectrum Re-use in a Wireless LAN

      Disclosed is a method to reduce the amount of collision among
adjacent cells of a wireless local area network, and thereby to
improve the use of the optical or radio-frequency spectrum.

                            (Image Omitted)

      In wireless networks with multiple, overlapping coverage areas
(cells), remote stations in the overlapping areas may cause or
encounter collisions, where remote or base stations in the two or
more overlapping cells simultaneously transmit messages.  This can be
avoided by time-sharing the use of the medium among the overlapping
cells.  However, this reduces the throughput of the several cells to
that of a single cell using the medium all the time.  The
signal-to-noise ratio is a strong function of the propagation
distance.  The base station can infer the proximity of a remote
station by monitoring its signal strength.  If the base station
determines that many of the remotes in the cell are close to the
center (where there is no overlap) and that few are in the fringes
(where overlap occurs), then it may gain increased throughput by
reducing its own transmit power and by reducing its receiver
sensitivity.  Under these conditions, the cell may no longer overlap
with its neighbors and no longer needs to coordinate its medium
access with the neighbors.  It is also unable to receive signals from
remote stations in the overlap areas, whether they are members of its
o...