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US 11,387,946 B2Granted
Reliable ultra-low latency communications
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsKhaled Shawky Hassan Hussein, Thomas Fehrenbach
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Abstract
Methods and systems for communicating according to an automatic repeat request, ARQ, scheme, and/or hybrid ARQ, HARQ, scheme are provided. A method may include: performing a first data transmission on a dedicated resource on a first channel; simultaneously to the first data transmission or in a subsequent resource, performing at least one redundancy transmission.
Claims33
A method for communicating according to a hybrid automatic repeat request, HARQ, scheme, the method comprising:
- performing a first data transmission at a first channel which is a first carrier component;
- in at least one physical resource subsequent to the first data transmission, performing at least one redundancy transmission at a second channel which is a second carrier component having grant-free physical resources, wherein the at least one redundancy transmission is performed according to an incremental redundancy for forward error correction, wherein the at least one redundancy transmission is performed, using a listen-before-talk scheme, without waiting for an acknowledgment message;
- concluding or postponing the at least one redundancy transmission when a stop condition or a postponing condition is met, the stop condition or the postponing condition including at least the reception of an acknowledgment, ACK, message transmitted on a channel which is different from the first and the second channels.
A method for receiving a data, comprising:
- receiving a first data at a first channel which is a first carrier component, and, subsequently, receiving at least one redundancy transmission, transmitted using a listen-before-talk technique, at a second channel which is a second carrier component having grant-free resources, wherein the at least one redundancy transmission is transmitted up to concluding or postponing the redundancy transmission when a stop condition or a postponing condition is met, the stop condition or postponing condition including at least the reception of an acknowledgment, ACK, message transmitted on a channel which is different from the first and the second channels, wherein the at least one redundancy transmission is performed according to an incremental redundancy for forward error correction, wherein the at least one redundancy transmission can be received without the transmission of an acknowledgment, ACK, message;
- performing a validity check on the first data and/or the at least one redundancy transmission, the method including combining incorrectly received redundancy transmission with previously incorrectly received data to reconstruct the transmitted data;
- and
- transmitting an acknowledgment, ACK, message if the validity check is positive for at least one of the first data and/or the at least one redundancy transmission, and/or
- transmitting a non-acknowledgment, NACK, message if the validity check is negative for the first data and/or the at least one redundancy transmission.
2 more elements
A device configured to:
- perform communications at a first channel which is a first carrier component;
- transmit a first data;
- subsequently, perform at least one redundancy transmission at a second channel which is a second carrier component having grant-free physical resources, wherein the at least one redundancy transmission is performed according to an incremental redundancy for forward error correction, wherein the at least one redundancy transmission is transmitted, using a listen-before-talk scheme, without waiting for an acknowledgment message;
- and
- conclude or postpone the redundancy transmission when a stop condition or a postponing condition is met, the stop condition or postponing condition including at least the reception of an acknowledgment, ACK, message transmitted on a channel which is different from the first and the second channels.
2 more elements
A device configured to:
- receive a first data on a dedicated resource in a first channel which is a first carrier component and, subsequently, receive at least one redundancy transmission, in the first or in a second channel which is a second carrier component, wherein the at least one redundancy transmission is transmitted, using a listen-before-talk scheme, up to a concluding or postponing the redundancy transmission when a stop condition or a postponing condition is met, wherein the at least one redundancy transmission is performed according to an incremental redundancy for forward error correction, wherein the at least one redundancy transmission can be obtained without waiting for an acknowledgment, ACK, message, the stop condition or a postponing condition including at least the reception of an acknowledgment, ACK, message transmitted on a channel which is different from the first and the second channels;
- perform a validity check on the first data and/or the at least one redundancy transmission;
- and
- transmit an acknowledgment, ACK, message and/or a non-acknowledgment, NACK, message on the basis of the result of the validity check.
1 more element
Dependencies are inferred from the claim text.