Acknowledgments or negative acknowledgments by relay stations and subscriber stations
View Patent ↗Various example embodiments are discloses. According to one example embodiment, a method may include sending a packet to both a relay station and a destination station in a wireless network, receiving a relay station acknowledgment (ACK) or negative acknowledgment (NACK) from the relay station during an ACK/NACK frame, and receiving a destination station ACK or NACK from the destination station during the ACK/NACK frame. The relay station ACK or NACK may either acknowledge or negatively acknowledge successful receipt of the packet by the relay station. The destination station ACK or NACK may either acknowledge or negatively acknowledge successful receipt of the packet by the destination station.
1. A method comprising:
sending a packet to both a relay station and a subscriber station in a wireless network;
receiving a relay station acknowledgment (ACK) or negative acknowledgment (NACK) from the relay station during an ACK/NACK frame, the relay station ACK or NACK either acknowledging or negatively acknowledging successful receipt of the packet by the relay station; and
receiving a subscriber station ACK or NACK from the subscriber station during the ACK/NAK frame, the subscriber station ACK or NACK either acknowledging or negatively acknowledging successful receipt of the packet by the subscriber station.
2. The method of claim 1 , wherein the sending the packet includes sending the packet to the relay station and the subscriber station, the packet including a downlink hybrid automatic repeat request (DL HARQ) control message assigning the ACK/NACK frame to both the relay station and the subscriber station for transmitting the relay station ACK or NACK and the subscriber station ACK or NACK, respectively.
3. The method of claim 1 , wherein:
receiving the relay station ACK or NACK from the relay station includes receiving a relay station ACK from the relay station;
receiving the subscriber station ACK or NACK from the subscriber station includes receiving a subscriber station NACK from the subscriber station; and
the method further includes sending a retransmit signal to the relay station instructing the relay station to retransmit the packet to the subscriber station.
4. The method of claim 1 , wherein the relay station ACK or NACK and the subscriber station ACK or NACK are received at different times and via a different frequency range during the ACK/NACK frame.
5. The method of claim 1 , wherein the relay station ACK or NACK and the subscriber station ACK or NACK are received at different times and via a same frequency range during the ACK/NACK frame.
6. The method of claim 1 , wherein the relay station ACK or NACK and the subscriber station ACK or NACK are received at a same time and via a different frequency range during the ACK/NACK frame.
7. The method of claim 1 , wherein the relay station ACK or NACK and the subscriber station ACK or NACK are received at a same time and via a same frequency range during the ACK/NACK frame.
8. The method of claim 7 , further comprising summing the relay station ACK or NACK and the subscriber station ACK or NACK and decoding the sum based on different signal strengths, phase offsets, or both signal strengths and phase offsets, of the relay station ACK or NACK and the subscriber station ACK or NACK.
9. The method of claim 7 , further comprising decoding the relay station ACK or NACK and the subscriber station ACK or NACK by dirty paper decoding.
10. The method of claim 7 , further comprising decoding the relay station ACK or NACK and the subscriber station ACK or NACK, wherein the one or more of the receiving stations knows or infers a priori information of the other station's ACK or NACK, and uses that information to compose the ACK or NACK signal or to encode the ACK or NACK in order to minimize the interference or maximize the probability of successful decoding at the source station.
11. The method of claim 7 , further comprising decoding each of the relay station ACK or NACK and the subscriber station ACK or NACK by a code division multiple access (CDMA) technique.
12. The method of claim 7 , further comprising decoding a total signal received based on the relay station ACK or NACK and the subscriber station ACK or NACK by a code division multiple access (CDMA) technique.
13. The method of claim 7 , further comprising distinguishing between the relay station ACK or NACK and the subscriber station ACK or NACK by a space division multiple access technique.
14. The method of claim 1 , wherein the receiving the relay station ACK or NACK includes receiving the relay station ACK or NACK from the relay station, the relay station ACK or NACK being based at least in part on a received signal strength of the packet.
15. An apparatus comprising:
a memory configured to store a packet;
a wireless transceiver configured to:
send the packet to both a relay station and a subscriber station;
receive a relay station acknowledgment (ACK) or negative acknowledgment (NACK) from the relay station during an ACK/NAK frame, the relay station ACK or NACK either acknowledging or negatively acknowledging successful receipt of the packet by the relay station; and
receiving a subscriber station ACK or NACK from the subscriber station during the ACK/NACK frame, the subscriber station ACK or NACK either acknowledging or negatively acknowledging successful receipt of the packet by the subscriber station; and
a controller configured to process the relay station ACK or NACK and the subscriber station ACK or NACK.
16. The apparatus of claim 15 , wherein the wireless transceiver is configured to send the packet to both the relay station and the subscriber station, the packet including a downlink hybrid automatic repeat request (DL HARQ) control message assigning the ACK/NACK frame to both the relay station and the subscriber station for transmitting the relay station ACK or NACK and the subscriber station ACK or NACK, respectively.
17. The apparatus of claim 15 , wherein the transceiver is configured to receive the relay station ACK or NACK and the subscriber station ACK or NACK at different times and via a different frequency range during the ACK/NACK frame.
18. The apparatus of claim 15 , wherein the transceiver is configured to receive the relay station ACK or NACK and the subscriber station ACK or NACK at different times and via a same frequency range during the ACK/NACK frame.
19. The apparatus of claim 15 , wherein the transceiver is configured to receive the relay station ACK or NACK and the subscriber station ACK or NACK at a same time and via a different frequency range during the ACK/NACK frame.
20. The apparatus of claim 15 , wherein the transceiver is configured to receive the relay station ACK or NACK and the subscriber station ACK or NACK at a same time and via a same frequency range during the ACK/NACK frame.
21. The apparatus of claim 20 , wherein the transceiver is configured to distinguish between the relay station ACK or NACK and the subscriber station ACK or NACK by a space division multiple access technique.
22. The apparatus of claim 20 , wherein the processor is configured to decode the relay station ACK or NACK and the subscriber station ACK or NACK by dirty paper decoding.
23. The apparatus of claim 20 , wherein the processor is configured to decode a total signal received based on the relay station ACK or NACK and the subscriber station ACK or NACK by a code division multiple access (CDMA) technique.
24. The apparatus of claim 20 , wherein the processor is configured to decode the relay station ACK or NACK and the subscriber station ACK or NACK by a code division multiple access (CDMA) technique.
25. The apparatus of claim 15 , wherein the relay station ACK or NACK is based at least in part on a received signal strength of the packet.