DETECTION AND RECOVERY OF HARQ NAK-TO-ACK FEEDBACK ERROR IN WIRELESS COMMUNICATIONS SYSTEMS
First Claim
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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.
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Abstract
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.
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Citations
20 Claims
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1. A method to be performed by a first wireless communications device, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless communications device, comprising:
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a radio to communicate with a second communications device over a wireless communications network; and a processor coupled to the radio, the processor to; receive, via the radio, a first transmission from the second communications device, the first transmission containing a first hybrid automatic repeat request (HARQ) channel ID (ACID) transmit a first NAK to the second wireless communications device to indicate that the first transmission was received incorrectly; receive, via the radio, a second transmission from the second communications device, the second transmission including a second ACID and an indication that the second transmission is a new transmission that includes new data; determine that the first ACID is the same as the second ACID; and transmit, based on the determination, a second NAK to the second communications device to indicate that the first transmission was received in error. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. An article comprising
a tangible computer-readable medium that contains instructions, which when executed by one or more processors of a first wireless communications device cause the first wireless communications device to perform operations 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 a HARQ Sequence Number (AI_SN) that indicates that the second transmission is not a retransmission of the first transmission; and transmitting, based on receiving the second transmission, a second NAK to the second wireless communication device to indicate that the first transmission was received incorrectly. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification