Patent ID: 7509555
Filing Date: 2009-03-24
Classification: H04L

Abstract:
1. A radio apparatus for performing a HARQ (Hybrid Automatic Repeat Request)-based automatic retransmission, comprising: a redundancy version control unit for identifying a redundancy version in the preceding retransmission when a retransmission is needed based on a determination criteria which differs depending on whether the redundancy version in the preceding transmission handled systematic bits as priority or as nonpriority; and a HARQ processing unit for performing rate matching for each of the systematic bits and parity bits of data to be retransmitted in accordance with the redundancy version identified by said redundancy version control unit, wherein, when the redundancy version in the preceding transmission handled the systematic bits as priority: said redundancy version control unit will now specify the systematic bits as nonpriority in the redundancy version in the retransmission if the number of bits of the systematic bits applied to said HARQ processing unit is larger than the number of bits delivered from said HARQ processing unit, and if there are limits to the number of available codes; and said redundancy version control unit will maintain the systematic bits as unchanged from priority in the redundancy version in the retransmission if the number of the systematic bits applied to said HARQ processing unit is equal to or smaller than the number of bits delivered from said HARQ processing unit and/or if there are no limits to the number of available codes.