Patent ID: 7013152

Claim:
In a network including a plurality of access points, via which communication units can connect to the network, wherein each of said plurality of access points belongs to a zone, a method for determining the zone to which one of said plurality of access points, via which a communication unit is connected to the network, belongs, comprising the steps of: assigning a message type to each of the zones in the network; receiving from said communication unit a query message for each zone in the network, where the query message for each zone is of the message type assigned to that zone; filtering said query messages at said one of said plurality of access points, via which said communication unit is connected to the network, so that only the query message of the message type, which is assigned to the zone to which said one of said plurality of access points belongs, is allowed to pass through; and determining the zone, to which said one of said plurality of access points belongs, depending on the query message allowed to pass through in said step of filtering.