Method and apparatus for delivering and constructing status information in communication system

The present invention in a communication system, a serving base station a buffer status information transmitting the message to a target base station, and including the buffer status information is started (starting) automatic repeat request (automatic repeat request: ARQ) block sequence number (block sequence number: the BSN), the end (last) ARQ BSN, the effective (valid) ARQ BSN and a reset state (reset status) includes information, the start ARQ BSN is ARQ window (window) of the ARQ block stored in the buffer of the serving base station indicates the ARQ BSN of an ARQ block diagram showing the start, the last ARQ BSN is the ARQ BSN ARQ block having the greatest ARQ BSN of the ARQ BSN and, the ARQ block of the ARQ block to be transmitted next time one of the ARQ block represents one of the available ARQ BSN is the reset condition information, the serving base BSN indicates the ARQ block corresponding to the ARQ is not discarded of the ARQ block contained in the ARQ window Whether sending a message command to initialize the buffer status information to the mobile station it characterized by indicating whether. Buffer status information, the handover, the packet, the response message