Patent ID: 8588183

Claim:
A non-transitory computer readable medium stored in a first access router configured to perform a method comprising: buffering first data to be transmitted to a first mobile station, and transmitting the first data to a second access router after receiving a handoff complete message from the second access router comprising an identifier for the mobile station; wherein when a signal strength from the first mobile station is less than a predetermined threshold, the first access router determines that the first mobile station will move, transmits an address of the first mobile station to at least one adjacent access router which is adjacent to the first access router after it is determined that the first mobile station will move, and buffers the first data; wherein the first access router does not establish a tunnel with an adjacent access router until the first access router determines that the first mobile station will move; wherein the first access router buffers the first data before the second access router is known, and wherein the second access router identifies the first access router by comparing the address of the first mobile station transmitted by the first access router, with an address of the first mobile station obtained where movement of the first mobile station is sensed.