DETECTION AND RECOVERY OF HARQ NAK-TO-ACK FEEDBACK ERROR IN WIRELESS COMMUNICATIONS SYSTEMS

摘要

In wireless communication networks that use ARQ/HARQ feedback protocols, when a first device receives an apparent HARQ ACK from a second device, the first device may make a new transmission using a HARQ Channel ID whose previous usage was under conditions indicating a likelihood of error in the ACK. When the second device receives the new transmission, the reuse of that HARQ Channel ID in a new transmission rather than a retransmission lets the second device know that its previous NAK transmission was incorrectly received as an ACK.

主权项

1. A method to be performed by a first wireless communications device, the method comprising:
receiving a first transmission from a second wireless communications device, the first transmission containing a first hybrid automatic repeat request (HARQ) channel ID (ACID); transmitting a first NAK to the second wireless communications device to indicate that the first transmission was received incorrectly; monitoring for a retransmission of the first transmission; receiving, while monitoring for the retransmission, a second transmission from the second wireless communications device, the second transmission containing the first ACID and an indication that the second transmission is not a retransmission of the first transmission; and transmitting a second NAK to the first device to indicate that the first transmission was received incorrectly; wherein said transmitting the first NAK complies with a HARQ protocol and said transmitting the second NAK complies with an automatic repeat request (ARQ) protocol.