| 摘要 |
PROBLEM TO BE SOLVED: To switch an FEC mode while continuing communication between communication devices and to maintain interchangeability. SOLUTION: A RowFEC reception determination part 62 determines the presence/absence depending on a received FEC packet D field and whether or not to receive a RowFEC packet within a fixed period. An L value and D value judgement part 63 acquires an L value and a D value from the Offset field and NA field of a ColFEC packet. An FEC operation system judgement part 64 uses the information of the L value and the D value acquired by the L value and D value judgement part and the reception history of a base sequence number and judges an FEC operation system by the pattern of the base sequence numbers of L pieces of ColFEC packets. A BlockSN detection part 65 uses the information of the presence/absence of RowFEC, the information of the L value and the D value and the judged result of the FEC operation system to detect a Block sequence number. COPYRIGHT: (C)2009,JPO&INPIT
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