Radio Node and Methods in a Wireless Communications Network

A method performed by a radio node, for handling a Hybrid Automatic Repeat Request (HARQ) process, the method comprising:

• obtaining an indication of an unfinished HARQ process at an occurrence of a switch, which switch is to be performed by a User Equipment (UE) and which switch relates to any one out of a switch from a first carrier to a second carrier, a switch from a first cell to a second cell, and a switch from a first bandwidth part to a second bandwidth part;
• and
• in response to determining that the unfinished HARQ process will not be continued after the switch, either:
• triggering Radio Link Control (RLC) retransmissions of Protocol Data Units (PDUs) corresponding to the unfinished HARQ process to be performed after the switch has occurred, or
• triggering proactively scheduled retransmissions on HARQ, corresponding to the unfinished HARQ process, to be performed before the switch occurs.

A radio node, the radio node comprising:

• receiver and transmitter circuitry;
• and
• processing circuitry operatively coupled to the receiver and transmitter circuitry and configured to:
• obtain an indication of an unfinished hybrid automatic repeat request (HARQ) process at an occurrence of a switch, which switch is to be performed by a User Equipment (UE) and which switch relates to any one out of a switch from a first carrier to a second carrier, a switch from a first cell to a second cell, and a switch from a first bandwidth part to a second bandwidth part;
• and
• in response to determining that the unfinished HARQ process will not be continued after the switch, either:
• trigger Radio Link Control (RLC) retransmissions of Protocol Data Units (PDUs) corresponding to the unfinished HARQ process to be performed after the switch has occurred, or
• trigger proactively scheduled retransmissions on HARQ, corresponding to the unfinished HARQ process, to be performed before the switch occurs.

A non-transitory computer-readable medium comprising, stored thereupon, a computer program comprising instructions that, when executed by a processor of a radio node, causes the radio node to:

• obtain an indication of an unfinished hybrid automatic repeat request (HARQ) process at an occurrence of a switch, which switch is to be performed by a User Equipment (UE) and which switch relates to any one out of a switch from a first carrier to a second carrier, a switch from a first cell to a second cell, and a switch from a first bandwidth part to a second bandwidth part;
• and
• in response to determining that the unfinished HARQ process will not be continued after the switch, either:
• trigger Radio Link Control (RLC) retransmissions of Protocol Data Units (PDUs) corresponding to the unfinished HARQ process to be performed after the switch has occurred, or
• trigger proactively scheduled retransmissions on HARQ, corresponding to the unfinished HARQ process, to be performed before the switch occurs.