Apparatus and method for handover in mobile communication system

An apparatus for performing a handover of a mobile terminal in a mobile communication system, the apparatus comprising:

• an L4 filter for receiving data to be transmitted to the mobile terminal undergoing the handover, and confirming a four-level port to determine whether to buffer the data and transmit the buffered data after completion of the handover of the mobile terminal, or to simultaneously transmit the data through both a first path used before the handover and a second path used after the handover, during the handover;
• a buffer for storing the buffered data;
• and
• a path switch for transmitting the data to the mobile terminal through the paths.

A method for performing a handover of a mobile terminal in a mobile communication system, the method comprising the steps of:

• receiving data to be transmitted to the mobile terminal undergoing the handover;
• determining whether or not the received data is real-time data;
• simultaneously transmitting the data to the mobile terminal through a first path used before the handover and a second path used after the handover if the data is real-time data, and buffering the data when the data is not real-time data;
• and
• transmitting the buffered data to the mobile terminal through the second path when the handover of the mobile terminal is completed.

A method for performing a handover of a mobile terminal in a mobile communication system, the method comprising the steps of:

• receiving data to be transmitted to the mobile terminal undergoing the handover;
• comparing a destination address and a port of the received data with a predetermined table, and determining whether or not the data requires real-time processing;
• transmitting the data to the mobile terminal through first and second paths when the data requires real-time processing, and buffering the data when the data does not require real-time processing;
• and
• transmitting the buffered data to the mobile terminal through the second path when the handover of the mobile terminal is completed.

A method for performing a handover of a mobile terminal in a mobile communication system, the method comprising the steps of:

• receiving data to be transmitted to the mobile terminal undergoing the handover;
• determining whether or not a priority of the received data is greater than a predetermined critical value;
• and
• simultaneously transmitting the data through both a first path used before the handover and a second path used after the handover when the priority of the received data is determined to be greater than the predetermined critical value, and transmitting the data through only one of the two paths when the priority of the received data is determined to be less than the predetermined critical value.