Reference resource for downlink preemption in nr-u

A radio access network, RAN, node comprising:

• processing circuitry;
• and
• memory coupled with the processing circuitry, wherein the memory includes instructions that when executed by the processing circuitry causes the RAN node to perform operations comprising:
• buffering first data for downlink transmission to a first wireless device;
• pre-emptively transmitting the first data on a channel that is subject to clear channel assessment, CCA, procedures, wherein the first data is transmitted in a reference downlink resource, RDR, domain in the channel in which second data for a second wireless device was previously scheduled for transmission by the network node, wherein the RDR domain is part of a RDR set that excludes a time period in which the network node is precluded from transmitting downlink data on the channel;
• and
• transmitting a preemption indicator, PI, to the second wireless device, the preemption indicator identifying the RDR domain.

A method by a wireless device in a wireless communication network, comprising:

• receiving, from a network node, a first wireless signal on a channel that is subject to clear channel assessment, CCA, procedures, wherein the first wireless signal is transmitted by the network node in a reference downlink resource, RDR, domain in the channel in which a second wireless signal was previously scheduled for transmission by the network node to the wireless device, wherein the RDR domain is part of a RDR set that excludes a time period in which the network node is precluded from transmitting downlink data on the channel;
• receiving a preemption indicator, PI, indicating that the first wireless signal was transmitted in the RDR domain preemptively of the second wireless signal;
• and
• discarding the first wireless signal in response to the PI.

A wireless device, comprising:

• processing circuitry;
• and
• memory coupled with the processing circuitry, wherein the memory includes instructions that when executed by the processing circuitry causes the wireless device to perform operations comprising:
• receiving, from a network node, a first wireless signal on a channel that is subject to clear channel assessment, CCA, procedures, wherein the first wireless signal is transmitted by the network node in a reference downlink resource, RDR, domain in the channel in which a second wireless signal was previously scheduled for transmission by the network node to the wireless device, wherein the RDR domain is part of a RDR set that excludes a time period in which the network node is precluded from transmitting downlink data on the channel;
• receiving a preemption indicator, PI, indicating that the first wireless signal was transmitted in the RDR domain preemptively of the second wireless signal;
• and
• discarding the first wireless signal in response to the PI.