Transmitting system, transmission slotting apparatus, receiving apparatus, and transmission slot generating method

A transmitting system comprising:

• a variable-length packet multiplexing apparatus which generates a variable-length packet comprising information indicative of a type of data and information indicative of a byte number of the data;
• and
• a transmission slotting apparatus which stores the variable-length packet in any of a plurality of slots forming transmission main signals;
• wherein the transmission slotting apparatus comprises
• a capacity calculator which receives setting information for the transmission main signals for one frame, and calculates, based on the setting information, a data capacity of the transmission main signals for one frame,
• an extractor which extracts a byte number of the variable-length packet,
• a remainder calculator which calculates a remaining capacity of the transmission main signals based on the data capacity calculated by the capacity calculator and the byte number extracted by the extractor,
• a selector which, if storing the variable-length packet in any of the slots makes the remaining capacity of the transmission main signals less than a minimum byte number of a variable-length packet, stores a null packet instead of the variable-length packet up to an end of the slots and outputs the slots storing the null packet, and
• a slot information multiplexer which multiplexes slot information and the slots output by the selector.

A transmission slotting apparatus comprising:

• a capacity calculator which receives setting information for transmission main signals for one frame, and calculates, based on the setting information, a data capacity of the transmission main signals for one frame, the transmission main signals comprising a plurality of slots;
• an extractor which extracts a byte number of a variable-length packet comprising information indicative of a type of data and information indicative of a byte number of the data;
• a remainder calculator which calculates a remaining capacity of the transmission main signals based on the data capacity calculated by the capacity calculator and the byte number extracted by the extractor;
• a selector which, if the remaining capacity of the transmission main signals having stored the variable-length packet in any of the slots is less than a minimum byte number of a variable-length packet, stores a predetermined data sequence in a region left in the slots and outputs the slots storing the data sequence;
• and
• a slot information multiplexer which multiplexes slot information and the slots output by the selector.

A transmission slotting apparatus comprising:

• a capacity calculator which receives setting information for transmission main signals for one frame, and calculates, based on the setting information, a data capacity of the transmission main signals for one frame, the transmission main signals comprising a plurality of slots;
• an extractor which extracts a byte number of a variable-length packet comprising information indicative of a type of data and information indicative of a byte number of the data;
• a remainder calculator which calculates a remaining capacity of the transmission main signals based on the data capacity calculated by the capacity calculator and the byte number extracted by the extractor;
• a selector which, if storing the variable-length packet in any of the slots makes the remaining capacity of the transmission main signals less than a minimum byte number of a variable-length packet, stores a null packet instead of the variable-length packet up to an end of the slots and outputs the slots storing the null packet;
• and
• a slot information multiplexer which multiplexes slot information and the slots output by the selector.

A receiving apparatus comprising:

• a data separator which receives a transmission main signal comprising a plurality of slots and takes out slot information including information about the slots and a slot main signal from the slots of the received transmission main signal, the transmission main signal storing a data sequence of a predetermined data byte number at an end of a last valid slot for one frame among the slots;
• a slot information interpreter which interprets the slot information and acquires the information about the slots;
• and
• a remover which determines a presence of the data sequence in the slot main signal based on the information acquired by the slot information interpreter, and removes the data sequence from the slot main signal.

A transmission slot generating method comprising:

• calculating a data capacity of transmission main signals for one frame based on setting information for the transmission main signals for one frame, the transmission main signals comprising a plurality of slots;
• extracting a byte number of a variable-length packet comprising information indicative of a type of data and information indicative of a byte number of the data;
• calculating a remaining capacity of the transmission main signals based on the data capacity and the byte number;
• storing the variable-length packet in any of the slots;
• storing, if the remaining capacity of the transmission main signals having stored the variable-length packet in any of the slots is less than a minimum byte number of a variable-length packet, a predetermined data sequence in a region left in the slots;
• and
• multiplexing slot information and the slots storing the data sequence.

A transmission slot generating method comprising:

• calculating a data capacity of transmission main signals for one frame based on setting information for the transmission main signals for one frame, the transmission main signals comprising a plurality of slots;
• extracting a byte number of a variable-length packet comprising information indicative of a type of data and information indicative of a byte number of the data;
• calculating a remaining capacity of the transmission main signals based on the data capacity and the byte number;
• storing the variable-length packet in any of the slots;
• storing, if storing the variable-length packet in any of the slots makes the remaining capacity of the transmission main signals less than a minimum byte number of a variable-length packet, a null packet instead of the variable-length packet up to an end of the slots;
• and
• multiplexing slot information and the slots storing the null packet.