Patent ID: 7821993

Claim:
A wireless network device comprising: a resource calculating unit which calculates resources needed to transmit packets if a transmission rate of a network changes; a comparing unit which compares the calculated resources and resources allotted by an access point of the network; and a control unit which determines whether to request additional resources by using a result of the comparison by the comparing unit; a resource information receiving unit which receives resource information transmitted by the access point; a resource requesting unit which requests the additional resources according to a control of the control unit if the calculated resources are greater than the resources allotted by the access point; and a resource receiving unit which receives the additional resources according to the request; wherein the resource information comprises a difference between all resources of the network less resources for best effort service, and the resources allotted by the access point, the difference being surplus resources; wherein, if the surplus resources included in the resource information are greater than the additional resources, the resource requesting unit requests the additional resources; wherein, if the surplus resources included in the resource information are less than the additional resources, the control unit transmits the packets via the best effort service.