Patent ID: 8705398

Claim:
An apparatus comprising: an estimating processing portion configured to estimate an offloading value indicating an amount of traffic which can be offloaded from a first transmission over a licensed spectrum to a second transmission over an unlicensed spectrum, a determining processing portion configured to determine a first buffer size of at least one transmission buffer to be used in the first transmission over the licensed spectrum, wherein the first buffer size is an actual buffer size of the at least one transmission buffer determined by combining buffer sizes of different priority buffers, wherein the determining processing portion is further configured to calculate a second buffer size for a third transmission over the licensed spectrum under consideration of the estimated offloading value and the second buffer size is a virtual buffer size which is calculated by subtracting a parameter corresponding to the estimated offloading value from the actual buffer size, and a buffer status information transmission processing portion configured to send buffer status information indicating the calculated second buffer size.