Systems and methods for uplink transmission scheme in multi-TRP operation
Presented are systems and methods for uplink transmission scheme in multi-transmit-receive-point (MTRP) operation. A wireless communication device can receive, from a wireless communication node, a downlink signaling comprising a field. The field can indicate whether one or two spatial relations are associated with a plurality of uplink transmissions to the wireless communication node. The wireless communication device can determine, based on the field, a transmission scheme for the uplink transmissions.
1 . A wireless communication method, comprising:
receiving, by a wireless communication device from a wireless communication node, a downlink signaling comprising a field indicating whether one or two spatial relations are to be used with a plurality of uplink transmissions to the wireless communication node, the downlink signaling indicating that one or more Demodulation Reference Signal (DM-RS) ports configured for the plurality of uplink transmissions are within at least one Code Division Multiplexing (CDM) group;
determining, by the wireless communication device, based on the field, a transmission scheme for the plurality of uplink transmissions using the one or more DM-RS ports within the at least one CDM group; and
sending, by the wireless communication device, at least one of the plurality of uplink transmissions in accordance with the transmission scheme.
2 . The method of claim 1 , wherein a first bit and a second bit of the field are indicated as “00” or “01,” and the method further comprises:
determining, by the wireless communication device, that the transmission scheme includes sending the plurality of uplink transmissions as a single uplink transmission occasion of a Transport Block (TB) using one of the one or two spatial relations.
3 . The method of claim 1 , wherein a first bit and a second bit of the field are indicated as “10” or “11,” and the method further comprises:
determining, by the wireless communication device, that the transmission scheme includes sending the plurality of uplink transmissions as a single uplink transmission occasion of a Transport Block (TB) using each of the one or two spatial relations that is associated with a respective one of a plurality of groups of transmission layers.
4 . The method of claim 3 , wherein sending at least one of the plurality of uplink transmissions further comprises simultaneously sending, by the wireless communication device to the wireless communication node, the plurality of uplink transmissions using the respective spatial relations.
5 . The method of claim 3 , wherein at least one of: a number of the spatial relations is 2, or a number of the plurality of groups of transmission layers is 2.
6 . The method of claim 3 , wherein an association between one of the spatial relations and one of the plurality of groups of transmission layers is indicated by at least one of a Downlink Control Information (DCI) signaling or a Radio Resource Control (RRC) configuration.
7 . The method of claim 3 , wherein the downlink signaling further indicates that one or more DM-RS ports configured for the uplink transmissions are within at least two CDM groups.
8 . The method of claim 1 , wherein a first bit and a second bit of the field are indicated as “10” or “11,” and the method further comprises:
determining, by the wireless communication device, that the transmission scheme includes sending the plurality of uplink transmission as a single uplink transmission occasion of a Transport Block (TB) using each of the spatial relations that is associated with a respective one of a plurality of non-overlapping frequency domain resource allocations.
9 . The method of claim 8 , wherein sending at least one of the plurality of uplink transmissions further comprises simultaneously sending, by the wireless communication device to the wireless communication node, the plurality of uplink transmissions using the plurality of non-overlapping frequency domain resource allocations, respectively.
10 . The method of claim 8 , wherein a number of the spatial relations is 2, and a number of the plurality of non-overlapping frequency domain resource allocations is 2.
11 . The method of claim 8 , wherein an association between one of the spatial relations and one of the plurality of non-overlapping frequency domain resource allocations is indicated by at least one of a downlink control information (DCI) indication or a radio resource control (RRC) configuration.
12 . The method of claim 8 , wherein the downlink signaling includes a higher layer parameter configured as a specific value to indicate the transmission scheme.
13 . The method of claim 8 , wherein the downlink signaling further indicates that one or more DM-RS ports configured for the uplink transmission are within one CDM group.
14 . The method of claim 1 , wherein a first bit and a second bit of the field are indicated as “10” or “11,” the method further comprises:
determining, by the wireless communication device, that the transmission scheme includes sending the plurality of uplink transmissions as a plurality of uplink transmission occasions of a Transport Block (TB) using each of the spatial relations that is associated with one of the plurality of uplink transmission occasions,
wherein the plurality of uplink transmission occasions each have a corresponding one of a plurality of non-overlapping frequency domain resource allocations.
15 . The method of claim 14 , further comprising:
simultaneously sending, by the wireless communication device to the wireless communication node, the plurality of uplink transmissions using the plurality of non-overlapping frequency domain resource allocations, respectively.
16 . The method of claim 14 , wherein at least one of: a number of the spatial relations is 2, or a number of the plurality of uplink transmission occasions is 2.
17 . The method of claim 14 , wherein an association between one of the spatial relations and one of the plurality of non-overlapping frequency domain resource allocations is indicated by at least one of a downlink control information (DCI) indication or a radio resource control (RRC) configuration.
18 . A wireless communication method, comprising:
sending, by a wireless communication node to a wireless communication device, a downlink signaling comprising a field indicating whether one or two spatial relations are to be used with a plurality of uplink transmissions from the wireless communication device, the downlink signaling indicating that one or more Demodulation Reference Signal (DM-RS) ports configured for the plurality of uplink transmissions are within at least one Code Division Multiplexing (CDM) group; and
causing, by the wireless communication node, the wireless communication device to (i) determine a transmission scheme for the plurality of uplink transmissions based on the field using the one or more DM-RS ports within the at least one CDM group and (ii) send at least one of the plurality of uplink transmissions in accordance with the transmission scheme.
19 . A wireless communication device, comprising:
at least one processor configured to:
receive, via a receiver from a wireless communication node, a downlink signaling comprising a field indicating whether one or two spatial relations are to be used with a plurality of uplink transmissions to the wireless communication node, the downlink signaling indicating that one or more Demodulation Reference Signal (DM-RS) ports configured for the plurality of uplink transmissions are within at least one Code Division Multiplexing (CDM) group; and
determine, based on the field, a transmission scheme for the plurality of uplink transmissions using the one or more DM-RS ports within the at least one CDM group; and
send, via a transmitter, at least one of the plurality of uplink transmissions in accordance with the transmission scheme.
20 . A wireless communication node, comprising:
at least one processor configured to:
send, via a transmitter to a wireless communication device, a downlink signaling comprising a field indicating whether one or two spatial relations are to be used with a signaling indicating that one or more with a plurality of uplink transmissions from the wireless communication device, the downlink signaling indicating that one or more Demodulation Reference Signal (DM-RS) ports configured for the plurality of uplink transmissions are within at least one Code Division Multiplexing (CDM) group;
cause the wireless communication device to (i) determine a transmission scheme for the plurality of uplink transmissions based on the field using the one or more DM-RS ports within the at least one CDM group, and (ii) send at least one of the plurality of uplink transmissions in accordance with the transmission scheme.