Method and device in a node used for wireless communication
The present disclosure provides a method and a device in a node for wireless communications. A node firstly receives a first signaling in a first link; and operates a first signal in a first link and transmits a second signal in a second link; the first signaling is used to determine a first identifier, the first identifier being used to indicate a first reference signal resource; the first reference signal resource is used to determine a spatial filter for a DMRS for a channel occupied by the first signal; the first identifier is used to determine a second identifier set; the second identifier set comprises a second identifier, the second identifier being used to indicate a second reference signal resource. The present disclosure improves the method and device for sidelink TCI design to optimize the system performance.
1 . A user equipment (UE) comprising:
a transceiver; and
a processor operatively coupled to the transceiver, the processor configured to:
control the transceiver to receive 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,
control the transceiver to transmit the first data signal on the first channel of the first wireless link, and
control 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.
2 . The UE according to claim 1 , wherein the controller is further configured to transmit, on the second wireless link, a control signal that comprises information indicating:
a second time-frequency resource set occupied by the second data signal, and
the selected second identifier is one of Q1 second-type identifiers of the second identifier set, Q1 being a positive integer greater than 1.
3 . The UE according to claim 1 , wherein the processor is further configured to receive a target information set that indicates that the first identifier is associated with the second identifier set.
4 . The UE according to claim 1 , wherein the processor is further configured to receive a first information set that indicates a first identifier set comprising K1 first-type identifiers, K1 being a positive integer greater than 1; the first identifier is a first-type identifier among the K1 first-type identifiers, the first identifier being one of the K1 first-type identifiers indicated by the first information set.
5 . The UE according to claim 1 , wherein none of a plurality of Q1 second-type reference signal resources respectively associated with the plurality of second identifiers is spatially related to first reference signal resource.
6 . The UE according to claim 1 , wherein the first reference signal resource comprises at least one of a synchronization signal/physical broadcast channel block (SSB) or a sounding reference signal (SRS) resource.
7 . The UE according to claim 1 , wherein each second reference signal resource comprises a channel state information reference signal (CSI-RS) resource for sidelink or a synchronization signal for sidelink.
8 . The UE according to claim 1 wherein time-domain resources occupied by the first data signal and the second data signal overlap and at least occupy one same orthogonal frequency division multiplexing (OFDM) symbol in the time domain.
9 . The UE according to claim 1 , wherein frequency-domain resources occupied by the first data signal and the second data signal are orthogonal in the frequency domain.
10 . The UE according to claim 4 , wherein the first identifier set comprises K1 to Q1, the first-type identifiers and the second identifier set comprises Q1 second-type identifiers, and K1 is equal to Q1, the selected second identifier having a position in the second identifier set that corresponds to a position of the first identifier in the first identifier set.
11 . The UE according to wherein the information indicated by the control signal is such that the first identifier activates the second identifier set for the second wireless link.
12 . The UE according to claim 11 , wherein time domain resources occupied by the control signal define a first instant of time-domain resources occupied by the second data signal are later than the first instance of time.
13 . The UE according to claim 11 , wherein activation of the second identifier set is effective only within a time window occupying multiple slots consecutive in the time domain.
14 . The UE according to claim 13 , wherein a start of the time window is the first instance of time defined by the time-domain resources occupied by the control signal.
15 . The UE according to claim 1 , wherein the first identifier comprises at least one of a transmission configuration indication (TCI) or a sounding reference signal indicator (SRI).
16 . The UE of claim 1 , wherein the second identifier comprises at least one of a TCI for sidelink or an SRI for sidelink.
17 . The UE according to claim 1 , wherein a pathloss for the wireless link determines a transmit power value of the first data signal and a transmit power value of the second data signal is unrelated to the pathloss for the first wireless link.
18 . The UE according to claim 1 , wherein the second identifier set comprises Q1 second-type identifiers and Q1 second-type beamforming vectors, Q1 being a positive integer greater than 1, the second-type identifiers being respectively associated with the Q1 second-type beamforming vectors, and the first reference signal resource is not related with any one of the Q1 second-type beamforming vectors.
19 . 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.
20 . 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.