Method of transmitting and receiving acknowledgment signal in a wireless communication system
A method of receiving an acknowledgement (ACK) signal from at least one access terminal (AT) in a wireless communication system is disclosed. More specifically, the method includes transmitting at least one packet via a packet data channel from an access network (AN), receiving at least one ACK signal from the at least one AT using same channelization resources, wherein each AT is assigned a code specific to each AT, and identifying the ACK signal corresponding to the transmitted packet from the received at least one ACK signal.
1. A method of receiving a plurality of acknowledgement (ACK)/negative acknowledgement (NAK) signals at a base station (BS) in a wireless communication system utilizing an orthogonal frequency division multiplexing (OFDM) scheme, the method comprising:
transmitting, by the BS, a plurality of data packets to a plurality of mobile stations;
receiving, by the BS, a plurality of first ACK/NAK signals from the plurality of mobile stations, wherein the plurality of first ACK/NAK signals are spread on a first set of orthogonal frequency tones using a plurality of sequences corresponding to the plurality of mobile stations;
receiving, by the BS, a plurality of second ACK/NAK signals from the plurality of mobile stations, wherein the plurality of second ACK/NAK signals are spread on a second set of orthogonal frequency tones, wherein the plurality of second ACK/NAK signals carry the same information as the plurality of first ACK/NAK signals; and
determining, by the BS, whether the plurality of data packets are successfully received by the plurality of mobile stations based on the plurality of first ACK/NAK signals and the plurality of second ACK/NAK signals;
wherein the first set of orthogonal frequency tones are different from the second set of orthogonal frequency tones over two transmission instants.
2. The method of claim 1 , wherein the plurality of sequences are generated from a single sequence.
3. The method of claim 1 , wherein the plurality of sequences are a plurality of scrambling sequences.
4. The method of claim 3 , wherein the plurality of scrambling sequences are pseudo noise sequence codes.
5. A method of transmitting an acknowledgement (ACK)/negative acknowledgment (NAK) signal at a mobile station in a wireless communication system utilizing an orthogonal frequency division multiplexing (OFDM) scheme, the method comprising:
receiving, by the mobile station, a data packet from a base station (BS); and
transmitting, by the mobile station, a first ACK/NAK signal to the BS via a first set of orthogonal frequency tones; and
transmitting, by the mobile station, a second ACK/NAK signal to the BS via a second set of orthogonal frequency tones;
wherein the first ACK/NAK signal and the second ACK/NACK signal carry same information and correspond to the data packet,
wherein the first ACK/NAK signal is spread on the first set of orthogonal frequency tones and the second ACK/NACK signal is spread on the second set of orthogonal frequency tones using a sequence assigned to the mobile station among a plurality of sequences;
wherein the first set of orthogonal frequency tones are different from the second set of orthogonal frequency tones over two transmission instants.
6. The method of claim 5 , wherein the plurality of sequences are generated from a single sequence.
7. The method of claim 5 , wherein the plurality of sequences are a plurality of scrambling sequences.
8. The method of claim 7 , wherein the plurality of scrambling sequences are pseudo noise sequence codes.
9. A base station (BS) configured to receive a plurality of acknowledgement (ACK)/negative acknowledgement (NAK) signals in a wireless communication system utilizing an orthogonal frequency division multiplexing (OFDM) scheme, the BS comprising:
a transmitter configured to transmit a plurality of data packets to a plurality of mobile stations;
a receiver configured to receive:
a plurality of first ACK/NAK signals from the plurality of mobile stations, wherein the plurality of first ACK/NAK signals are spread on a first set of orthogonal frequency tones using a plurality of sequences corresponding to the plurality of mobile stations; and
a plurality of second ACK/NAK signals from the plurality of mobile stations, wherein the plurality of second ACK/NAK signals are spread on a second set of orthogonal frequency tones, and the plurality of second ACK/NAK signals carry the same information as the plurality of first ACK/NAK signals; and
a processor configured to determine whether the plurality of data packets are successfully received by the plurality of mobile stations based on the plurality of first ACK/NAK signals and the plurality of second ACK/NAK signals;
wherein the first set of orthogonal frequency tones are different from the second set of orthogonal frequency tones over two transmission instants.
10. The BS of claim 9 , wherein the plurality of sequences are generated from a single sequence.
11. The BS of claim 9 , wherein the plurality of sequences are a plurality of scrambling sequences.
12. The BS of claim 11 , wherein the plurality of scrambling sequences are pseudo noise sequence codes.
13. A mobile station configured to transmit an acknowledgement (ACK)/negative acknowledgment (NAK) signal in a wireless communication system utilizing an orthogonal frequency division multiplexing (OFDM) scheme, the mobile station comprising:
a receiver configured to receive a data packet from a base station (BS); and
a transmitter configured to transmit:
a first ACK/NAK signal to the BS via a first set of orthogonal frequency tones; and
a second ACK/NAK signal to the BS via a second set of orthogonal frequency tones;
wherein the first ACK/NAK signal and the second ACK/NACK signal carry same information and correspond to the data packet;
wherein the first ACK/NAK signal is spread on the first set of orthogonal frequency tones and the second ACK/NACK signal is spread on the second set of orthogonal frequency tones using a sequence assigned to the mobile station among a plurality of sequences; and
wherein the first set of orthogonal frequency tones are different from the second set of orthogonal frequency tones over two transmission instants.
14. The mobile station of claim 13 , wherein the plurality of sequences are generated from a single sequence.
15. The mobile station of claim 13 , wherein the plurality of sequences are a plurality of scrambling sequences.
16. The mobile station of claim 15 , wherein the plurality of scrambling sequences are pseudo noise sequence codes.