Data transmission in radio system

Abstract

The invention relates to a method of transmitting data in a radio system from a transmitter to a receiver, and to a radio system using the method, a radio transmitter and a radio receiver. A transmitter ( ) comprises a channel coder ( ) for channel coding a data block into a coded data block by using a selected channel coding and for puncturing the coded data block by using a first puncturing pattern, and transmission means ( ) for transmitting the coded data block punctured by the first puncturing pattern to a receiver ( ). The receiver ( ) comprises a channel decoder ( ) for decoding the received coded data block, means ( ) for detecting a need for retransmission of the received coded data block, and means ( ) for transmitting a retransmission request of the coded data block to the transmitter ( ). The channel coder ( ) increases the code rate of the coded data block to be retransmitted by puncturing the coded data block coded by the channel coding of the original transmission by using a second puncturing pattern comprising fewer symbols to be transmitted than the first puncturing pattern. The transmission means ( ) transmit the coded data block punctured by the second puncturing pattern to the receiver ( ). The receiver ( ) comprises means ( ) for combining a received coded data block ( ) punctured by the first puncturing pattern and a received coded data block ( ) punctured by the second puncturing pattern. The channel decoder ( ) decodes the channel coding of the combined coded data block.