Browse Prior Art Database

Adjustable Hand-Off Management in a Time Division Multiple Access-Based Wireless LAN

IP.com Disclosure Number: IPCOM000117642D
Original Publication Date: 1996-Apr-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Bauchot, F: AUTHOR [+4]

Abstract

Disclosed is a method for hand-off management that allows adjustment of a hand-off criteria in order to optimize performance or range.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Adjustable Hand-Off Management in a Time Division Multiple Access-Based
Wireless LAN

      Disclosed is a method for hand-off management that allows
adjustment of a hand-off criteria in order to optimize performance or
range.

      The method allows the selection of a mode individually in each
remote which minimizes the performance degradation usually observed
near border of a cell.

      One method to have a seamless hand-off with a minimum
performance degradation is to monitor the radio environment before
leaving the cell.  Unfortunately, monitoring the radio environment
prevents the remote from activating its power-saving function when it
has no traffic.  When the remote is in traffic with the base, this
method induces a costly design (extra processing power needed,
sophisticated radio).

      These constraints lead to a design where the remote station
operates sequentially: first, it chooses to leave the current cell;
second, it searches for a new base station.  The problem is then to
choose the criteria for leaving a cell.  In a system that does not
offer the mobility (hand-off between cells), the natural design is to
keep the link with the current base as long as possible.  This is
particularly important in noisy environments.  A wicker link has a
strong negative effect on the range and immunity to interference.

      However, in a system that offers inter cell mobility, a
stronger link leads to a degradation of performance near the cell
border.  This may lead to some unacceptable situations.  Suppose that
a remote is currently linked to a base A.  This remote mov...