Method and system for implementing H-ARQ-assisted ARQ operation
A method and system for implementing hybrid automatic repeat request (H-ARQ)-assisted automatic repeat request (ARQ) in a wireless communication system are disclosed. When an H-ARQ negative acknowledgement (NACK)-to-positive acknowledgement (ACK) error occurs, the H-ARQ receiver sends an H-ARQ NACK-to-ACK error indicator to the H-ARQ transmitter unless a maximum retransmission limit has reached, a maximum time for delivery has expired or a lifespan of the failed packet has expired. The H-ARQ transmitter sends a local NACK to the ARQ transmitter so that the failed packet is recovered at an ARQ level. The H-ARQ receiver sends a local NACK to the ARQ receiver if the H-ARQ receiver does not receive the failed packet before certain conditions occur. The ARQ receiver may send a status report to the ARQ transmitter for recovery of the failed packet.
1. A method for implementing hybrid automatic repeat request (H-ARQ)-assisted automatic repeat request (ARQ), the method comprising:
determining that an H-ARQ negative acknowledgement (NACK)-to-positive acknowledgement (ACK) error has occurred with respect to a failed packet, wherein more than one packet is transmitted simultaneously and the H-ARQ NACK-to-ACK error indicator indicates H-ARQ NACK-to-ACK errors of more than one packet;
determining whether or not to transmit an H-ARQ NACK-to-ACK error indicator, wherein the H-ARQ NACK-to-ACK error indicator is not transmitted on a condition that any of
the number of retransmissions of the failed packet has reached a maximum retransmission limit,
a maximum time for delivery of the failed packet has expired, or
a lifespan of the failed packet has expired; and
determining whether or not to transmit a local NACK.
2. The method of claim 1 wherein the H-ARQ NACK-to-ACK error indicator is associated with an H-ARQ process identity (ID) and the failed packet.
3. The method of claim 2 wherein the H-ARQ NACK-to-ACK error indicator includes the H-ARQ process ID and a transmission sequence number of the failed packet.
4. The method of claim 2 wherein the H-ARQ NACK-to-ACK error indicator is transmitted with a fixed timing offset with respect to transmission of the failed packet.
5. The method of claim 1 wherein transmission of the H-ARQ NACK-to-ACK error indicator and transmission of the failed packet are independent.
6. The method of claim 1 wherein the H-ARQ NACK-to-ACK error indicator is transmitted via at least one of physical layer signaling, a medium access control (MAC) layer signaling and a radio link control (RLC) layer signaling.
7. The method of claim 1 wherein the H-ARQ NACK-to-ACK error indicator is transmitted along with a cyclic redundancy check (CRC).
8. The method of claim 1 wherein it is determined not to transmit a local NACK on a condition that the failed packet is not received before expiration of a recovery timer which is set when the NACK-to-ACK indicator is transmitted.
9. The method of claim 1 wherein it is determined not to transmit a local NACK on a condition that the failed packet is not received until after a packet with a sequence number higher than a sequence number of the failed packet by a predetermined number is received.
10. The method of claim 1 wherein it is determined not to transmit a local NACK on a condition that the number of retransmissions of the failed packet reaches a maximum retransmission limit for the failed packet.
11. The method of claim 1 wherein it is determined not to transmit a local NACK on a condition that the failed packet is not received until after a maximum time for delivery of the failed packet expires.
12. A method for implementing hybrid automatic repeat request (H-ARQ)-assisted automatic repeat request (ARQ), the method comprising:
determining that an H-ARQ negative acknowledgement (NACK)-to-positive acknowledgement (ACK) error has occurred with respect to a failed packet;
determining whether or not to transmit an H-ARQ NACK-to-ACK error indicator, wherein the H-ARQ NACK-to-ACK error indicator is not transmitted on a condition that any of
the number of retransmissions of the failed packet has reached a maximum retransmission limit,
a maximum time for delivery of the failed packet has expired, or
a lifespan of the failed packet has expired; and
determining not to transmit a local NACK on a condition that the failed packet is not received until after a packet with a sequence number higher than a sequence number of the failed packet by a predetermined number is received.
13. The method of claim 12 wherein the H-ARQ NACK-to-ACK error indicator is associated with an H-ARQ process identity (ID) and the failed packet.
14. The method of claim 13 wherein the H-ARQ NACK-to-ACK error indicator includes the H-ARQ process ID and a transmission sequence number of the failed packet.
15. The method of claim 13 wherein the H-ARQ NACK-to-ACK error indicator is transmitted with a fixed timing offset with respect to transmission of the failed packet.
16. The method of claim 12 wherein transmission of the H-ARQ NACK-to-ACK error indicator and transmission of the failed packet are independent.
17. The method of claim 12 wherein the H-ARQ NACK-to-ACK error indicator is transmitted via at least one of physical layer signaling, a medium access control (MAC) layer signaling and a radio link control (RLC) layer signaling.
18. The method of claim 12 wherein more than one packet is transmitted simultaneously and the H-ARQ NACK-to-ACK error indicator indicates H-ARQ NACK-to-ACK errors of more than one packet.
19. The method of claim 12 wherein the H-ARQ NACK-to-ACK error indicator is transmitted along with a cyclic redundancy check (CRC).
20. The method of claim 12 further comprising determining not to transmit a local NACK on a condition that the failed packet is not received before expiration of a recovery timer which is set when the NACK-to-ACK indicator is transmitted.
21. The method of claim 12 further comprising determining not to transmit a local NACK on a condition that the number of retransmissions of the failed packet reaches a maximum retransmission limit for the failed packet.
22. The method of claim 12 further comprising determining not to transmit a local NACK on a condition that the failed packet is not received until after a maximum time for delivery of the failed packet expires.
23. A hybrid automatic repeat request (H-ARQ) receiver for implementing an H-ARQ-assisted automatic repeat request (ARQ), the receiver being configured to:
determine that an H-ARQ negative acknowledgement (NACK)-to-positive acknowledgement (ACK) error has occurred with respect to a failed packet, wherein more than one packet is transmitted simultaneously and the H-ARQ NACK-to-ACK error indicator indicates H-ARQ NACK-to-ACK errors of more than one packet;
determine whether or not to transmit an H-ARQ NACK-to-ACK error indicator, wherein the H-ARQ NACK-to-ACK error indicator is not transmitted on a condition that any of
the number of retransmissions of the failed packet has reached a maximum retransmission limit,
a maximum time for delivery of the failed packet has expired, or
a lifespan of the failed packet has expired; and
determining whether or not to transmit a local NACK.
24. The receiver of claim 23 wherein the H-ARQ NACK-to-ACK error indicator is associated with an H-ARQ process identity (ID) and the failed packet.
25. The receiver of claim 24 wherein the H-ARQ NACK-to-ACK error indicator includes the H-ARQ process ID and a transmission sequence number of the failed packet.
26. The receiver of claim 24 wherein the H-ARQ NACK-to-ACK error indicator is transmitted with a fixed timing offset with respect to transmission of the failed packet.
27. The receiver of claim 23 wherein transmission of the HARQ NACK-to-ACK error indicator and transmission of the failed packet are independent.
28. The receiver of claim 23 wherein the H-ARQ NACK-to-ACK error indicator is transmitted via at least one of physical layer signaling, a medium access control (MAC) layer signaling and a radio link control (RLC) layer signaling.
29. The receiver of claim 23 wherein the H-ARQ NACK-to-ACK error indicator is transmitted along with a cyclic redundancy check (CRC).
30. The receiver of claim 23 wherein it is determined not to transmit a local NACK on a condition that the failed packet is not received before expiration of a recovery timer which is set when the NACK-to-ACK indicator is transmitted.
31. The receiver of claim 23 wherein it is determined not to transmit a local NACK on a condition that the failed packet is not received until after a packet with a sequence number higher than a sequence number of the failed packet by a predetermined number is received.
32. The receiver of claim 23 wherein it is determined not to transmit a local NACK on a condition that the number of retransmissions of the failed packet reaches a maximum retransmission limit for the failed packet.
33. The receiver of claim 23 wherein it is determined not to transmit a local NACK on a condition that the failed packet is not received until after a maximum time for delivery of the failed packet expires.
34. A hybrid automatic repeat request (H-ARQ) receiver for implementing an H-ARQ-assisted automatic repeat request (ARQ), the receiver being configured to:
determine that an H-ARQ negative acknowledgement (NACK)-to-positive acknowledgement (ACK) error has occurred with respect to a failed packet;
determine whether or not to transmit an H-ARQ NACK-to-ACK error indicator, wherein the H-ARQ NACK-to-ACK error indicator is not transmitted on a condition that any of
the number of retransmissions of the failed packet has reached a maximum retransmission limit,
a maximum time for delivery of the failed packet has expired, or
a lifespan of the failed packet has expired; and
determining not to transmit a local NACK on a condition that the failed packet is not received until after a packet with a sequence number higher than a sequence number of the failed packet by a predetermined number is received.
35. The receiver of claim 34 wherein the H-ARQ NACK-to-ACK error indicator is associated with an H-ARQ process identity (ID) and the failed packet.
36. The receiver of claim 35 wherein the H-ARQ NACK-to-ACK error indicator includes the H-ARQ process ID and a transmission sequence number of the failed packet.
37. The receiver of claim 35 wherein the H-ARQ NACK-to-ACK error indicator is transmitted with a fixed timing offset with respect to transmission of the failed packet.
38. The receiver of claim 34 wherein transmission of the HARQ NACK-to-ACK error indicator and transmission of the failed packet are independent.
39. The receiver of claim 34 wherein the H-ARQ NACK-to-ACK error indicator is transmitted via at least one of physical layer signaling, a medium access control (MAC) layer signaling and a radio link control (RLC) layer signaling.
40. The receiver of claim 34 wherein more than one packet is transmitted simultaneously and the H-ARQ NACK-to-ACK error indicator indicates H-ARQ NACK-to-ACK errors of more than one packet.
41. The receiver of claim 34 wherein the H-ARQ NACK-to-ACK error indicator is transmitted along with a cyclic redundancy check (CRC).
42. The receiver of claim 34 wherein it is determined not to transmit a local NACK on a condition that the failed packet is not received before expiration of a recovery timer which is set when the NACK-to-ACK indicator is transmitted.
43. The receiver of claim 34 wherein it is determined not to transmit a local NACK on a condition that the number of retransmissions of the failed packet reaches a maximum retransmission limit for the failed packet.
44. The method of claim 34 wherein it is determined not to transmit a local NACK on a condition that the failed packet is not received until after a maximum time for delivery of the failed packet expires.