Patent ID: 8457059
Filing Date: 2013-06-04
Classification: H04L

Abstract:
1. A transmission apparatus comprising: a first encoding unit configured to generate a new packet from a new portion obtained from a block which is generated from information bits, to generate a retransmission packet from a retransmission portion obtained from a block which is generated from information bits and is held for a retransmission, and to assign the new packet and the retransmission packet to a communication channel respectively; a second encoding unit configured to assign, to a communication channel, a packet obtained by mixing the new portion and the retransmission portion; a encoding method switching unit configured to switch between operations of the first encoding unit and the second encoding unit, so that communication channel data output from the first encoding unit or the second encoding unit is transmitted; and a transmission control unit configured to control the encoding method switching unit based on information indicating a communication quality of the communication channel in a reception apparatus, wherein: the second encoding unit comprises the encoding method switching unit switches among operations of the first encoding unit, the third encoding unit and the fourth encoding unit; and the transmission control unit calculates an encoding rate indicating efficiency of encoding in the communication channel, makes the encoding method switching unit select the fourth encoding unit if the encoding rate is higher than a given threshold value, and otherwise makes the encoding method switching unit select the third encoding unit when selecting the second encoding unit.