Patent ID: 8493948

Claim:
A method of exchanging messages at a coordinator in a wireless network in which a coordinator alone is broadcasting beacons to control the wireless network, the method comprising: receiving a change request message for requesting a change of a beacon position upon which a beacon is to be sent by the coordinator among configuration parameters of the wireless network from a device associated with the wireless network, wherein the change request message comprises a beacon position change field indicating an offset value representing a shift distance between an original beacon position and a requested new beacon position; transmitting a response message to the device in response to the change request message; and transmitting a plurality of beacons to the device, each of the plurality of beacons comprising a parameter change information element (IE), wherein the parameter change IE comprises a change type field indicating that a type of the parameter to be changed is the beacon position, a change beacon number field comprising a beacon number of a superframe when the change of the beacon position takes effect, a unique number that identifies the parameter change IE, and a network parameter field comprising information about a changed beacon position.