Method and apparatus for compensating QoS during handover by base station in wireless broadband access system

A serving Base Station (BS) apparatus for compensating Quality of Service (QoS) during a handover of a Mobile Station (MS) in a wireless broadband access system, the apparatus comprising:

• a control module for generating a message including a data transmission/reception time just before the handover and at least one of a size of a time window for which a data transmission/reception history is recorded in an accumulated way and an amount of data transmitted/received during the time window;
• and
• a transmission module for transmitting the message to a target BS,
• wherein the message is used to calculate at least one of a handover break time and data rate during the handover break time at the target BS, in order to compensate the QoS, and
• wherein if it is determined, by the target BS, that there is a grant that the target BS has failed to transmit/receive during the handover break time, the failed grant is compensated by the target BS.

A method for compensating Quality of Service (QoS) during a handover of a Mobile Station (MS) by a target Base Station (BS) in a wireless broadband access system, the method comprising:

• receiving a message including a data transmission/reception time just before the handover and at least one of a size of a time window for which a data transmission/reception history is recorded in an accumulated way and an amount of data transmitted/received during the time window;
• reading from the message the data transmission/reception time and at least one of the size of the time window and the amount of transmitted/received data, and determining a data rate during a handover break time using a predetermined value if there is information that is missing from the message;
• and
• performing QoS compensation during the handover break time using the data rate,
• wherein the performing of the QoS compensation comprises:
• determining whether there is a grant that the target BS has failed to transmit/receive during the handover break time;
• and
• compensating for the failed grant.