Apparatus and method for retransmitting high-speed data in a CDMA mobile communication system
First Claim
1. A method for retransmitting data at a retransmission request from a receiver by a transmitter in a CDMA (Code Division Multiple Access) mobile communication system including a turbo encoder with a given coding rate and initially transmitting systematic bits and parity bits obtained by encoding the data by the turbo encoder using one modulation mode among a plurality of modulation modes, the method comprising the steps of:
- determining a modulation mode to be used between the transmitter and the receiver in response to the retransmission request;
distributing coded bits obtained by encoding the data at the coding rate into systematic bits and parity bits; and
if the determined modulation mode is different from the modulation mode used at initial transmission, modulating into modulated symbols coded bits transmittable by the determined modulation mode among the systematic bits and the parity bits at the initial transmission, and transmitting the modulated symbols.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for retransmitting data at a retransmission request from a receiver by a transmitter in a CDMA mobile communication system including a turbo encoder with a given coding rate and initially transmitting systematic bits and parity bits obtained by encoding the data by the turbo encoder using one modulation mode among a plurality of modulation modes. A controller determines a modulation mode to be used between the transmitter and the receiver in response to the retransmission request. A distributor distributes coded bits obtained by encoding the data at the coding rate into systematic bits and parity bits. A selector selects coded bits transmittable by the determined modulation mode among the systematic bits and the parity bits at the initial transmission, if the determined modulation mode is different from the modulation mode used at initial transmission. A modulator modulates the transmittable coded bits into modulated symbols according to the determined modulation mode.
-
Citations
28 Claims
-
1. A method for retransmitting data at a retransmission request from a receiver by a transmitter in a CDMA (Code Division Multiple Access) mobile communication system including a turbo encoder with a given coding rate and initially transmitting systematic bits and parity bits obtained by encoding the data by the turbo encoder using one modulation mode among a plurality of modulation modes, the method comprising the steps of:
-
determining a modulation mode to be used between the transmitter and the receiver in response to the retransmission request;
distributing coded bits obtained by encoding the data at the coding rate into systematic bits and parity bits; and
if the determined modulation mode is different from the modulation mode used at initial transmission, modulating into modulated symbols coded bits transmittable by the determined modulation mode among the systematic bits and the parity bits at the initial transmission, and transmitting the modulated symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus for retransmitting data at a retransmission request from a receiver by a transmitter in a CDMA (Code Division Multiple Access) mobile communication system including a turbo encoder with a given coding rate and initially transmitting systematic bits and parity bits obtained by encoding the data by the turbo encoder using one modulation mode among a plurality of modulation modes, the apparatus comprising:
-
a controller for determining a modulation mode to be used between the transmitter and the receiver in response to the retransmission request;
a distributor for distributing coded bits obtained by encoding the data at the coding rate into systematic bits and parity bits;
a selector for selecting coded bits transmittable by the determined modulation mode among the systematic bits and the parity bits at the initial transmission, if the determined modulation mode is different from the modulation mode used at initial transmission; and
a modulator for modulating the transmittable coded bits into modulated symbols according to the determined modulation mode. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
-
15. A method for receiving modulated symbols retransmitted by a transmitter according to a modulation mode different from a modulation mode used at initial transmission in a CDMA (Code Division Multiple Access) mobile communication system including a turbo encoder with a given coding rate and initially transmitting systematic bits and parity bits obtained by encoding data by the turbo encoder as modulated symbols using one modulation mode among a plurality of modulation modes, the method comprising the steps of:
-
demodulating the modulated symbols according to a demodulation mode corresponding to the modulation mode used by the transmitter at retransmission, and outputting coded bits distributing the coded bits into systematic packets comprised of the systematic bits and parity packets comprised of the parity bits;
combining the systematic packets with previously received systematic packets, and combining the parity packets with previously received parity packets; and
decoding the combined systematic packets and the combined parity packets into information bits. - View Dependent Claims (16, 17, 18, 19, 20, 21)
-
-
22. An apparatus for receiving modulated symbols retransmitted by a transmitter according to a modulation mode different from a modulation mode used at initial transmission in a CDMA (Code Division Multiple Access) mobile communication system including a turbo encoder with a given coding rate and initially transmitting systematic bits and parity bits obtained by encoding data by the turbo encoder as modulated symbols using one modulation mode among a plurality of modulation modes, the apparatus comprising:
-
a demodulator for demodulating the modulated symbols according to a demodulation mode corresponding to the modulation mode used by the transmitter at retransmission, and outputting coded bits;
a packet distributor for distributing the coded bits into systematic packets comprised of the systematic bits and parity packets comprised of the parity bits;
a combiner for combining the systematic packets with previously received systematic packets, and combining the parity packets with previously received parity packets; and
a decoder for decoding the combined systematic packets and the combined parity packets into information bits. - View Dependent Claims (23, 24, 25, 26, 27, 28)
-
Specification