Method and device in a node used for wireless communication

A base station for wireless communications, comprising:

• a transceiver;
• and
• a processor operatively coupled to the transceiver, the processor configured to:
• control the transceiver to transmit, to a user equipment (UE), on a first wireless link for cellular communications, a control signal, wherein:
• the control signal comprises information indicating a first identifier that identifies a first reference signal resource and a second identifier set comprising a plurality of second identifiers,
• the first reference signal resource is associated with a demodulation reference signal (DMRS) for a first channel on the first wireless link and defines a spatial filter for reception or transmission of the DMRS of a first data signal, and
• each second identifier is associated with a corresponding second reference signal resource;
• and
• control the transceiver to transmit the first data signal on the first channel of the first wireless link toward the UE,
• wherein the information indicated by the control signal is such that the UE is enabled to transmit, on a second wireless link for communications other than cellular communications, a second data signal on a second channel using one of the second reference signal resources associated with a selected second identifier from the second identifier set such that a DMRS of the second channel is quasi co-located (QCL) with the corresponding second reference signal resource, the second wireless link being between the UE and a node that is not the base station.

A method, implemented in a wireless transmit/receive unit (WTRU), the method comprising:

• receiving a control signal, from a base station, on a first wireless link for cellular communications, wherein:
• the control signal comprises information indicating a first identifier that identifies a first reference signal resource and a second identifier set comprising a plurality of second identifiers,
• the first reference signal resource is associated with a demodulation reference signal (DMRS) for a first channel on the first wireless link and defines a spatial filter for reception or transmission of the DMRS of a first data signal, and
• each second identifier is associated with a corresponding second reference signal resource,
• controlling the transceiver to transmit the first data signal on the first channel of the first wireless link;
• and
• controlling the transceiver to transmit, on a second wireless link for communications other than cellular communications, a second data signal on a second channel using one of the second reference signal resources associated with a selected second identifier from the second identifier set such that a DMRS of the second channel is Quasi Co-located (QCL) with the corresponding second reference signal resource, the second wireless link being between the UE and a node that is not the base station.