Communication apparatus, communication system, communication method, and communication control program

1. A communication apparatus, comprising:

a generation device configured to generate a frame,

the frame comprising

a first separation field, the first separation field including at least a first MAC protocol data unit (MPDU) length field and a first cyclic redundancy check (CRC) field, the first MPDU length field including first length information of a first MPDU, the first CRC field being for protecting at least the first length information,

the first MPDU following the first separation field, the first MPDU including a first MAC header, a first data field, and a first frame check sequence (FCS), the first FCS being for detecting an error occurred in at least the first data field,

a second separation field following the first MPDU, the second separation field including at least a second MPDU length field and a second CRC field, the second MPDU length field including second length information set to a value of zero to indicate no second MPDU directly follows the second separation field, the second CRC field being for protecting at least the second length information,

a third separation field following the second separation field, the third separation field including at least a third MPDU length field and a third CRC field, the third MPDU length field including third length information of a third MPDU, the third CRC field being for protecting at least the third length information, and

the third MPDU following the third separation field, the third MPDU including a third MAC header, a third data field, and a third FCS, the third FCS being for detecting an error occurred in at least the third data field,

wherein the frame is to be transmitted to a destination communication apparatus.

2. The apparatus according to claim 1 , wherein

the first MAC header includes a first address field and a first duration field, the first address field being for describing a destination address, the first duration field being for describing a first value, the first value representing a duration for which a communication medium is occupied,

the third MAC header includes a third address field and a third duration field, the third address field being for describing a destination address, the third duration field being for describing a third duration value, the third duration value representing a duration for which the communication medium is occupied,

a same destination address is described in the first address field and the third address field, and

a same duration value is described in the first duration field and the third duration field.

3. The apparatus according to claim 1 , wherein the first separation field further includes a first reservation field, the second separation field further includes a second reservation field, and the third separation field further includes a third reservation field.

4. The apparatus according to claim 1 , wherein the first separation field, the second separation field, and the third separation field have a fixed length of 32 bits.

5. The apparatus according to claim 1 , wherein the first MPDU field represents a length of the first MPDU in octets, and the third MPDU field represents a length of the third MPDU in octets.

6. The apparatus according to claim 1 , further comprising:

an antenna, wherein the frame is transmitted via the antenna.