Adjustable Hand-Off Management in a Time Division Multiple Access-Based Wireless LAN
Original Publication Date: 1996-Apr-01
Included in the Prior Art Database: 2005-Mar-31
Bauchot, F: AUTHOR [+3]
Disclosed is a method for hand-off management that allows adjustment of a hand-off criteria in order to optimize performance or range.
Adjustable Hand-Off Management in a Time Division
a method for hand-off management that allows
adjustment of a hand-off criteria in order to optimize performance or
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,
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...