Harq assistance information feedback for fast data recovery

A User Equipment, UE, configured to support a Hybrid Automatic Repeat Request, HARQ, process when communicating with a network node of a radio access network, the UE comprising:

• at least one processor, and
• at least one memory storing instructions that, when executed by the at least one processor, cause the UE at least to:
• establish a connection towards the network node;
• receive, from the network node, a Transport Block, TB;
• carry out a Cyclic Redundancy Check, CRC, for decoding the received TB;
• in case of detecting a failure in the decoding by determining that the received TB fails the CRC check, prepare an assistance information,
• transmit towards the network node information for indicating the failure and the assistance information for enabling the network node to trigger actions related to the failed TB based on the assistance information,
• wherein the UE is further configured to, in case of detecting the failure, determine at least one transmission parameter based on Signal-to-Interference plus Noise Ratio, SINR, measurements performed by the UE, wherein at least one determined transmission parameter is different from a corresponding transmission parameter used for the transmission of the failed TB, and wherein one transmission parameter is, in particular, related to a calculated estimated number of retransmissions required for a successful decoding of said TB at the UE, wherein one transmission parameter is related to rank, and
• wherein the UE is further configured to include information related to at least one determined different transmission parameter in the assistance information.

A User Equipment, UE, configured to support a Hybrid Automatic Repeat Request, HARQ, process when communicating with a network node of a radio access network, the UE comprising:

• at least one processor, and
• at least one memory storing instructions that, when executed by the at least one processor, cause the UE at least to:
• establish a connection towards the network node;
• receive, from the network node, a Transport Block, TB;
• carry out a Cyclic Redundancy Check, CRC, for decoding the received TB;
• in case of detecting a failure in the decoding by determining that the received TB fails the CRC check, prepare an assistance information,
• transmit towards the network node information for indicating the failure and the assistance information for enabling the network node to trigger actions related to the failed TB based on the assistance information,
• wherein the UE is further configured to, in case of detecting the failure, determine at least one transmission parameter based on Signal-to-Interference plus Noise Ratio, SINR, measurements performed by the UE, wherein at least one determined transmission parameter is different from a corresponding transmission parameter used for the transmission of the failed TB, and wherein one transmission parameter is, in particular, related to a calculated estimated number of retransmissions required for a successful decoding of said TB at the UE, and
• wherein the UE is further configured to include information related to at least one determined different transmission parameter in the assistance information, wherein the assistance information comprises an information element comprising two bits indicating four cases

A network node of a radio access network, configured to support a hybrid automatic repeat request, HARQ, process when communicating with a User Equipment, UE, the network node comprising:

• at least one processor, and
• at least one memory storing instructions that, when executed by the at least one processor, cause the network node at least to:
• establish a connection towards the UE;
• transmit, to the UE, a transport block, TB;
• receive, from the UE, information for indicating a failure in decoding the TB at the UE and an associated assistance information prepared by the UE, wherein the assistance information includes information related to a transmission parameter different from a corresponding transmission parameter used for the transmission of the failed TB and
• trigger actions related to the failed TB based on the assistance information for supporting successful decoding of said TB at the UE, wherein the assistance information indicates to carry out transmission for the failed TB with a new rank different from an initial rank used for the failed transmission of the TB, wherein the network node is further caused to:
• carry out transmission for the failed TB with the new rank, or
• select a modified new rank with an index lower than the indicated new rank and carry out transmission for the failed TB with the modified new rank.