Method and apparatus for transmitting/receiving data in a communication system using multiple frequency bands

A method for receiving a packet in a communication system using multiple frequency bands where each of the multiple frequency bands is operated by a plurality of systems, and each of the plurality of systems use the same air interface or different interface, the method comprising:

• receiving Packet Data Units (PDUs) over at least two frequency bands among the multiple frequency bands, wherein at least two frequency bands are determined by comparing a size of the PDU with an amount of data supported by each of the multiple frequency bands, depending on the comparison result;
• and
• restoring a Service Data Unit (SDU) according to fragment information included in a header of each of the PDUs wherein the fragment information includes information indicating whether a corresponding PDU has been transmitted over at least two frequency bands, and a Band Fragment Sequence Number indicating an assembly order of the PDUs so that a reception side can restore the SDU when the corresponding PDU has been fragmented from the same SDU.

A method for receiving data in a communication system using multiple frequency bands where each of the multiple frequency bands is operated by a plurality of systems, and each of the plurality of systems use the same air interface or different interface, the method comprising:

• decrypting a wireless resource (MAP) allocated separately for each of the frequency bands to extract fragment information therefrom;
• and
• receiving Packet Data Units (PDUs) over the frequency bands separately, and restoring one Service Data Unit (SDU) according to fragment information corresponding to the corresponding frequency band, wherein the frequency bands are determined depending on the comparison result of sizes of the PDUs with amount of data supported by each frequency band.

An apparatus for receiving data in a communication system using multiple frequency bands where each of the multiple frequency bands is operated by a plurality of systems, and each of the plurality of systems use the same air interface or a different interface, the apparatus comprising:

• a MAP decryption unit for decrypting a wireless resource (MAP) allocated separately for each of the frequency bands to extract fragment information therefrom;
• and
• a restoration unit for receiving Packet Data Units (PDUs) over the frequency bands separately, and restoring one Service Data Unit (SDU) according to fragment information corresponding to the corresponding frequency band, wherein the frequency bands are determined depending on the comparison result of sizes of the PDUs with amount of data supported by each frequency band.