Method and a device for enhanced performance in a cellular wireless TDD system

A method for use in a cellular wireless access system comprising at least one base station for controlling traffic to and from a cell in the system, said cell accommodating at least a first user terminal, in which system said first user terminal is scheduled for receiving traffic from said base station during a first time period, a down link period (DL), and in which system said first user terminal is scheduled for transmitting traffic to said base station during a second time period, an up link period (UL), and in which system there is a first guard period (TUD) at the transition from the up link period to the down link period, and a second guard period (TDU) at the transition from the down link period to the up link period, said method comprising:

• measuring an interference level in the cell during at least a part of the time between two consecutive down link periods;
• and
• varying at least one of the following in accordance with the measured interference level:
• the duration of said first guard period (TUD), the duration of said second guard period (TDU), the duration of the up link period, and the traffic sent in the up link period.