Radio communication device and radio communication method

1. A radio communication device that transmits and receives protocol data units in a packet data convergence protocol layer located above a radio link control layer, the radio communication device comprising:

a receiver that receives, in the packet data convergence protocol layer from a destination radio communication device, a status report indicating reception status of the protocol data units in the packet data convergence protocol layer,

wherein in the status report, an excess part of a protocol data unit having a size exceeding a maximum size of the protocol data unit is deleted, and

wherein a sequence number length of the protocol data units in the packet data convergence protocol layer is extended above 15 bits; and

a processor that controls retransmission of the protocol data units based on the status report such that a protocol data unit that has already been transmitted to the destination radio communication device but for which reception status is not included in the status report is retransmitted.

2. A radio communication device that transmits and receives protocol data units in a packet data convergence protocol layer located above a radio link control layer, the radio communication device comprising:

a processor that generates a status report indicating reception status of the protocol data units in the packet data convergence protocol layer; and

a transmitter that transmits the status report in the packet data convergence protocol layer to a destination radio communication device,

wherein if a size of a protocol data unit that includes the status report exceeds a maximum size of the protocol data unit, the processor splits the status report and generates status report pieces,

wherein a sequence number length of the protocol data units in the packet data convergence protocol layer is extended above 15 bits, and

the transmitter transmits to the destination radio communication device the protocol data units that include the status report pieces.

3. The radio communication device as claimed in claim 2 , wherein the processor determines whether to generate the status report pieces based on an instruction from the destination radio communication device.

4. The radio communication device as claimed in claim 2 , wherein a protocol data unit transmitted by the transmitter includes an indicator that indicates whether any subsequent status report piece exists.

5. The radio communication device as claimed in claim 2 , wherein a protocol data unit transmitted by the transmitter includes user plane data in an interval when a plurality of the protocol data units that include the status report pieces is transmitted.

6. A radio communication method that transmits and receives protocol data units in a packet data convergence protocol layer located above a radio link control layer, the radio communication method comprising:

generating a status report that indicates reception status of the protocol data units in the packet data convergence protocol layer; and

transmitting the status report in the packet data convergence protocol layer to a destination radio communication device, wherein

generating the status report includes, if the size of the protocol data unit that includes the status report exceeds a maximum size of the protocol data unit, splitting the status report to generate status report pieces, and

transmitting the status report includes transmitting to the destination radio communication device the protocol data units that include the status report pieces,

wherein a sequence number length of the protocol data units in the packet data convergence protocol layer is extended above 15 bits.