Patent ID: 8897296

Claim:
A communication device to transfer a received packet to a data terminal device, the communication device being coupled to the data terminal device in a wire or wireless system, the communication device comprising: a determining unit configured to determine whether or not a compression state of a compressed header added to the packet is Full Context indicating a maximum compressed state on a down link in which the packet is transferred from the communication device to the data terminal; and a transfer unit configured to transfer, to the down link, the packet to which the compressed header is added and to transmit an activation request signal used on case of activating a routing module using a robust header compression (RoHC) algorithm to the data terminal device including the routing module, when the compression state of the compressed header is the Full Context, or to decompress the compressed header and to transmit the decompressed header to the data terminal device, when the compression state of the compressed header is not the Full Context.