Patent ID: 7869429
Filing Date: 2011-01-11
Classification: H04L

Abstract:
1. A packet relaying apparatus comprising: an input unit for receiving data packets for transfer from a first communication path to a second communication path having a Maximum Transmission Unit (MTU) smaller than that of the first communication path, the data packets each comprising a header portion and a payload from the first communication path; a payload type discrimination unit for discriminating a specific data packet having a payload that includes a group of transport stream (TS) packets and a header portion that includes header information indicating that the payload includes TS packets, out of the data packets received by the input unit; a payload reconstruction unit for judging whether the number of TS packets in the payload of the specific data packet exceeds a predetermined threshold which depends on the MTU of the second communication path, dividing the group of TS packets in the payload of the specific data packet unit, in TS packet size units into sub-groups of TS packets when the number of TS packets exceeds the predetermined threshold, and generating a plurality of reconstructed data packets each including a payload including one of the sub-groups and a header portion including the header information indicating that the payload includes TS packets; and an output unit for outputting the reconstructed data packets generated by the payload reconstruction unit, the specific data packet judged that the number of TS packets does not exceed the predetermined threshold, and data packets judged other than the specific data packet, to the second communication path.