Transmitting/receiving apparatus and method for packet retransmission in a mobile communication system

A method of retransmitting in a transmitter of a mobile communication system coded bits upon request for a retransmission from a receiver, the transmitter encodes a packet data stream to coded bits at a predetermined code rate, maps the coded bits to modulation symbols in a predetermined modulation scheme, and transmits the modulation symbols on a transport channel to the receiver, the method comprising the step of:

• generating first coded bits by inverting the coded bits;
• generating second coded bits by cyclically shifting the coded bits by a predetermined number of bits;
• generating third coded bits by inverting the shifted coded bits;
• mapping one of the first coded bits, the second coded bits, and the third coded bits to modulation symbols according to the sequence number of a retransmission request received from the receiver;
• and
• transmitting the modulation symbols to the receiver.

A method of retransmitting in a transmitter of a mobile communication system coded bits upon request for a retransmission from a receiver, the transmitter encodes a packet data stream to coded bits at a predetermined code rate, separates the coded bits into a first group having a relatively high priority and a second group having a relatively low priority, respectively maps the bits of the first group and the bits of the second group to a relatively high reliability part and a relatively low reliability part, in modulation symbols in a predetermined modulation scheme, and transmits the modulation symbols on a transport channel to the receiver, the method comprising the step of:

• inverting the bits of the first and second groups upon request for a retransmission of the coded bits from the receiver;
• mapping the inverted first group to the relatively high reliability part and the inverted second group to the relatively low reliability part in modulation symbols;
• and
• transmitting the modulation symbols to the receiver.

A method of retransmitting in a transmitter of a mobile communication system coded bits upon request for a retransmission from a receiver, the transmitter encodes a packet data stream to coded bits at a predetermined code rate, maps the coded bits to modulation symbols in a predetermined modulation scheme, and transmits the modulation symbols on a transport channel to the receiver, the method comprising the step of:

• rearranging the coded bits in a predetermined rearrangement pattern upon request of a retransmission of the coded bits from the receiver;
• inverting the rearranged coded bits;
• mapping the inverted coded bits to modulation symbols;
• and
• transmitting the modulation symbols to the receiver.

An apparatus for retransmitting in a transmitter of a mobile communication system coded bits upon request for a retransmission from a receiver, the transmitter encodes a packet data stream to coded bits at a predetermined code rate, maps the coded bits to modulation symbols in a predetermined modulation scheme, and transmits the modulation symbols on a transport channel to the receiver, the apparatus comprising:

• a distributor for separating the coded bits into a first group having a relatively high priority and a second group having a relatively low priority;
• an interleaver for separately interleaving the first group and the second group;
• a bit inverter for inverting the interleaved bits upon request for a retransmission of the coded bits from the receiver;
• and
• a modulator for mapping the inverted first group to a relatively high reliability part and the inverted second group to a relatively low reliability part in modulation symbols.

An apparatus for retransmitting in a transmitter of a mobile communication system coded bits upon request for a retransmission from a receiver, the transmitter encodes a packet data stream to coded bits at a predetermined code rate, maps the coded bits to modulation symbols in a predetermined modulation scheme, and transmits the modulation symbols on a transport channel to the receiver, the apparatus comprising:

• a bit rearranger for rearranging the coded bits in a predetermined rearrangement pattern upon request for a retransmission of the coded bits from the receiver;
• a bit inverter for inverting the rearranged bits;
• and
• a modulator for mapping the inverted bits to modulation symbols.

A method of receiving in a receiver of a mobile communication system coded bits transmitted from a transmitter, the transmitter separates the coded bits into a first group having a relatively high priority and a second group having a relatively low priority, inverts the bits of the first and second groups, respectively maps the inverted first group bits and the inverted second group bits to a relatively high reliability part and a relatively low reliability part, in modulation symbols in a predetermined modulation scheme, and transmits the modulation symbols to the receiver, upon request for a retransmission of the coded bits from the receiver, the method comprising the step of:

• demodulating data received in correspondence with a transmitted retransmission request and outputting coded bits;
• inverting the coded bits;
• separating the inverted coded bits into the first group having the relatively high priority and the second group having the relatively low priority;
• and
• decoding the bits of the first and second groups at a predetermined code rate.

A method of receiving in a receiver of a mobile communication system coded bits from a transmitter, the transmitter rearranges the coded bits in a predetermined rearrangement pattern, inverts the rearranged bits, maps the inverted bits to modulation symbols in a predetermined modulation scheme, and transmits the modulation symbols to the receiver, upon request for a retransmission of the coded bits from the receiver, the method comprising the step of:

• demodulating data received in correspondence with a transmitted retransmission request and outputting coded bits;
• inverting the coded bits;
• rearranging the inverted coded bits in an inverse rearrangement pattern corresponding to the rearrangement pattern;
• and
• decoding the rearranged bits at a predetermined code rate.

An apparatus for receiving in a receiver of a mobile communication system coded bits from a transmitter, the transmitter separates the coded bits into a first group having a relatively high priority and a second group having a relatively low priority, inverts the bits of the first and second groups, respectively maps the inverted first group bits and the inverted second group bits to a relatively high reliability part and a relatively low reliability part, in modulation symbols in a predetermined modulation scheme, and transmits the modulation symbols to the receiver, upon request for a retransmission of the coded bits from the receiver, the apparatus comprising:

• a demodulator for demodulating data received in correspondence with a transmitted retransmission request and outputting coded bits;
• a bit inverter for inverting the coded bits;
• a serial-to-parallel converter for separating the inverted coded bits into the first group having the relatively high priority and the second group having the relatively low priority;
• a deinterleaver unit for deinterleaving the first group bits and the second group bits, separately;
• and
• a decoder for decoding the deinterleaved bits at a predetermined code rate.

An apparatus for receiving in a receiver of a mobile communication system coded bits from a transmitter, the transmitter rearranges the coded bits in a predetermined rearrangement pattern, inverts the rearranged bits, maps the inverted bits to modulation symbols in a predetermined modulation scheme, and transmits the modulation symbols to the receiver, upon request for a retransmission of the coded bits from the receiver, the apparatus comprising:

• a demodulator for demodulating data received in correspondence with a transmitted retransmission request and outputting coded bits;
• a bit inverter for inverting the coded bits;
• a bit rearranger for rearranging the inverted coded bits in an inverse rearrangement pattern corresponding to the rearrangement pattern;
• and
• a decoder for decoding the rearranged bits at a predetermined code rate.