Method and device for indicating a reference resource for quasi-co-located downlink data reception
Method and device in nodes for wireless communications. A node firstly receives a first signaling in a first time-frequency resource set, the first signaling indicating a target reference signal resource; and receives a first signal in a second time-frequency resource set; a DMRS of a channel occupied by the first signal is QCL with the target reference signal resource; a target reference signal resource set comprises K1 candidate reference signal resources, with the first signaling indicating the target reference signal resource among the K1 candidate reference signal resources; at least either of frequency-domain resources occupied by the second time-frequency resource set or time-domain resources occupied by the second time-frequency resource set are used to determine the target reference signal resource set. Present application improves the method of indicating data-scheduling beams with multiple search spaces under M-TRP being combined monitored, thus reducing the signaling overhead and optimizing the system performance.
1 . A user equipment (UE), comprising:
a transmitter;
a receiver; and
a processor;
wherein the transmitter, the receiver, and the processor are configured to:
receive, in a first time-frequency resource set, downlink control information (DCI) indicating a target reference signal resource; and
receive, in a second time-frequency resource set, a physical downlink shared channel (PDSCH);
wherein a target reference signal resource set includes a plurality of candidate reference signal resources, and the DCI indicates the target reference signal resource among the plurality of candidate reference signal resources;
wherein a demodulation reference signal (DMRS) associated with the PDSCH is quasi co-located (QCL) with the target reference signal resource.
2 . The UE of claim 1 , wherein at least one of frequency-domain resources occupied by the second time-frequency resource set and time-domain resources occupied by the second time-frequency resource set is used by the UE to determine the target reference signal resource set.
3 . The UE of claim 1 , wherein the first time-frequency resource set includes at least one control resource set (CORESET), and the DCI is carried on a physical downlink control channel (PDCCH) that occupies resources of the CORESET.
4 . The UE of claim 1 , wherein the DCI includes a transmission configuration indication (TCI) field, and the target reference signal resource corresponds to a TCI state or a TCI-Stateld indicated by the TCI field, and each of the plurality of candidate reference signal resources corresponds to a respective one of the TCI state or TCI-Stateld.
5 . The UE of claim 1 , wherein the first time-frequency resource set includes a first time-frequency resource subset and a second time-frequency resource subset, the first and second time-frequency resource subsets being respectively associated with a first control resource set and a second control resource set, the first and second control resource sets being respectively associated with a first search space set and a second search space set.
6 . The UE of claim 5 , wherein the first time-frequency resource subset includes a plurality of first-type control channel candidates and the second time-frequency resource subset includes a plurality of second-type control channel candidates.
7 . The UE of claim 1 , wherein the target reference signal resource set is one of a plurality of reference signal resource sets, and at least one of frequency-domain resources occupied by the second time-frequency resource set and time-domain resources occupied by the second time-frequency resource set is used to select, from among the plurality of reference signal resource sets, the target reference signal resource set.
8 . The UE of claim 1 , wherein at least one of frequency-domain resources occupied by the second time-frequency resource set and time-domain resources occupied by the second time-frequency resource set is used by the UE to determine an integer, and the integer is used to determine the target reference signal resource set.
9 . The UE of claim 8 , wherein the integer is one of:
(i) a number of resource blocks (RBs) occupied by the second time-frequency resource set in a frequency domain;
(ii) an index of an RB with a smallest index among RBs occupied by the second time-frequency resource set in the frequency domain;
(iii) an index of an RB with a largest index among RBs occupied by the second time-frequency resource set in the frequency domain; or
(iv) a number of orthogonal frequency division multiplexing (OFDM) symbols occupied by the second time-frequency resource set in a time domain.
10 . The UE of claim 1 , wherein both frequency-domain resources occupied by the second time-frequency resource set and time-domain resources occupied by the second time-frequency resource set are used together by the UE to determine the target reference signal resource set.
11 . A method performed by a user equipment (UE), the method comprising:
receiving, in a first time-frequency resource set, downlink control information (DCI) indicating a target reference signal resource; and
receiving, in a second time-frequency resource set, a physical downlink shared channel (PDSCH);
wherein a target reference signal resource set includes a plurality of candidate reference signal resources, and the DCI indicates the target reference signal resource among the plurality of candidate reference signal resources;
wherein a demodulation reference signal (DMRS) associated with the PDSCH is quasi co-located (QCL) with the target reference signal resource.
12 . The method of claim 11 , wherein at least one of frequency-domain resources occupied by the second time-frequency resource set and time-domain resources occupied by the second time-frequency resource set is used by the UE to determine the target reference signal resource set.
13 . The method of claim 11 , wherein the first time-frequency resource set includes at least one control resource set (CORESET), and the DCI is carried on a physical downlink control channel (PDCCH) that occupies resources of the CORESET.
14 . The method of claim 11 , wherein the DCI includes a transmission configuration indication (TCI) field, and the target reference signal resource corresponds to a TCI state or a TCI-Stateld indicated by the TCI field, and each of the plurality of candidate reference signal resources corresponds to a respective one of the TCI state or TCI-Stateld.
15 . The method of claim 11 , wherein the first time-frequency resource set includes a first time-frequency resource subset and a second time-frequency resource subset, the first and second time-frequency resource subsets being respectively associated with a first control resource set and a second control resource set, the first and second control resource sets being respectively associated with a first search space set and a second search space set.
16 . The method of claim 15 , wherein the first time-frequency resource subset includes a plurality of first-type control channel candidates and the second time-frequency resource subset includes a plurality of second-type control channel candidates.
17 . The method of claim 11 , wherein the target reference signal resource set is one of a plurality of reference signal resource sets, and at least one of frequency-domain resources occupied by the second time-frequency resource set and time-domain resources occupied by the second time-frequency resource set is used to select, from among the plurality of reference signal resource sets, the target reference signal resource set.
18 . The method of claim 11 , wherein at least one of frequency-domain resources occupied by the second time-frequency resource set and time-domain resources occupied by the second time-frequency resource set is used by the UE to determine an integer, and the integer is used to determine the target reference signal resource set.
19 . The method of claim 18 , wherein the integer is one of:
(i) a number of resource blocks (RBs) occupied by the second time-frequency resource set in a frequency domain;
(ii) an index of an RB with a smallest index among RBs occupied by the second time-frequency resource set in the frequency domain;
(iii) an index of an RB with a largest index among RBs occupied by the second time-frequency resource set in the frequency domain; or (iv) a number of orthogonal frequency division multiplexing (OFDM) symbols occupied by the second time-frequency resource set in a time domain.
20 . The method of claim 11 , wherein both frequency-domain resources occupied by the second time-frequency resource set and time-domain resources occupied by the second time-frequency resource set are used together by the UE to determine the target reference signal resource set.