The present invention provides a transmission control scheme for wireless digital
networks comprised of a plurality of access points each communicating with access
terminals, which improves data throughput to access terminals located in areas
where interference from the neighboring access points are high. Generally, under
the transmission control scheme according to the present invention, the access
points are controlled so that neighboring access points will not transmit signals
simultaneously with transmission parameters providing high robustness. The transmission
parameters include, for instance, transmission power, a modulation scheme and a
coding rate. Higher power transmission achieves higher robustness. Transmission
at a lower modulation level achieves higher robustness. Transmission at a lower
coding rate achieves higher robustness. Transmission providing high or low robustness
will expand or narrow a virtual communication zone, which is defined in this application
as an area within which it is feasible at a given level of error performance for
access terminals to communicate with the access point in the zone. The access points
may change their transmission parameters according to predetermined schedules,
such as at regular intervals.
