Patent ID: 8559338

Claim:
A wireless network system comprising: a coordinator; a first device; and a second device, wherein the first device is configured to: transmit a first request message to the coordinator to request change of a power management mode of the first device from a normal mode to a power saving mode; and transmit a third request message to the coordinator to request change of the power management mode of the first device from the power saving mode to the normal mode, wherein the second device is configured to: transmit a second request message to the coordinator in order to communicate with the first device and request change of the power management mode of the first device from the power saving mode to the normal mode, wherein the coordinator is configured to: transmit a first response to the first device in response to the first request message, the first response indicating approval of the first request message; broadcast a first beacon after transmitting the first response to the first device, the first beacon comprising information indicating that the first device is in the power saving mode; transmit a second response to the second device in response to the second request message, the second response indicating approval of the second request message; broadcast a second beacon after transmitting the second response to the second device, the second beacon comprising information indicating that the first device needs to change the power management mode of the first device from the power saving mode to the normal mode; transmit a third response to the first device in response to the third request message, the third response indicating approval of the third request message; and broadcast a third beacon after transmitting the third response to the first device, the third beacon comprising information indicating that the first device is in the normal mode.