Patent ID: 6317418
Filing Date: 2001-11-13
Classification: H04L,Y10S

Abstract:
A method for transmitting packet switched data in a mobile communications system between a transmitter-receiver pair using an ARQ protocol, which mobile communications system comprises a network part and at least one subscriber terminal and a bidirectional radio connection between the network part and the subscriber terminal, and the transmitter-receiver pair is formed by the network part and the subscriber terminal, the method comprising:the transmitter inserts the packet switched data to be transmitted on the bidirectional radio connection in transmission units;the transmitter transmits the transmission units to the receiver;the receiver checks the quality of each received transmission unit independently;the receiver stores the received transmission units;the receiver transmits a retransmission request formed on the basis of the quality of the transmission units to the transmitter;the transmitter retransmits the requested transmission units to the receiver;the receiver forms combined transmission units from the originally transmitted transmission unit and from the corresponding at least one retransmitted transmission unit;the receiver checks the quality of each combined transmission unit;the receiver stores the combined transmission units;repeating the retransmission-requesting and retransmission until the quality of the combined transmission units corresponds to the predetermined quality level required of the combined transmission unit;the receiver detects the signal which includes the combined transmission unit; andwherein a packet is encoded and interleaved in transmission, and after the signal has been detected, the receiver deinterleaves and decodes the packet, and decides on the basis of the quality of the packet whether to request retransmissions of the transmission units of the packet.