Techniques for group common reference signal triggering in wireless communications
Some aspects described herein relate to receiving, from a network via at least one of multiple transmission/reception points (TRPs), a group common (GC)-downlink control information (DCI) in a first component carrier (CC) that includes a set of blocks intended for one or more UEs, and receiving, based at least in part on the GC-DCI and a subset of the set of blocks that are intended for the UE, one or more downlink reference signals of multiple downlink reference signals over resources in a second CC, where the one or more downlink reference signals are associated with each block of the subset of the set of blocks. Other aspects relate to transmitting the GC-DCI and the one or more downlink reference signals.
1 . An apparatus for wireless communication, comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to execute the instructions to cause the apparatus to:
receive, from a network via at least one of multiple transmission/reception points (TRPs), a group common (GC)-downlink control information (DCI) in a first component carrier (CC), wherein the GC-DCI includes a set of blocks intended for multiple UEs, wherein the set of blocks includes multiple blocks, wherein each block of the multiple blocks indicates a different one of multiple downlink reference signals associated with a different one of the multiple UEs, and wherein the GC-DCI indicates multiple uplink sounding reference signals (SRSs);
receive, based at least in part on the GC-DCI and a subset of the set of blocks that are intended for the apparatus, one or more downlink reference signals of the multiple downlink reference signals over resources in a second CC, wherein the one or more downlink reference signals are associated with each block of the subset of the set of blocks; and
transmit one or more of the multiple uplink SRSs that are associated with the one or more downlink reference signals on a third CC.
2 . The apparatus of claim 1 , wherein at least a first portion of the subset of the set of blocks each indicate one of the multiple downlink reference signals, and wherein at least a second portion of the subset of the set of blocks each indicate one of the multiple uplink SRSs.
3 . The apparatus of claim 2 , wherein the GC-DCI indicates a different one of the multiple uplink sounding reference signals (SRSs) associated with a different one of the multiple UEs.
4 . The apparatus of claim 2 , wherein the first portion of the subset of the set of blocks and the second portion of the subset of the set of blocks are interleaved in the set of blocks.
5 . The apparatus of claim 2 , wherein the second portion of the subset of the set of blocks includes a first consecutive portion of the subset of the set of blocks, and wherein the second portion of the subset of the set of blocks includes a second consecutive portion of the subset of the set of blocks that are subsequent to the first consecutive portion.
6 . The apparatus of claim 1 , wherein each block in the subset of the set of blocks indicates one of the multiple downlink reference signals and one of the multiple uplink SRSs associated with the one of the multiple downlink reference signals.
7 . The apparatus of claim 1 , wherein each block in the subset of the set of blocks indicates one of the multiple uplink SRSs to transmit, and wherein the one or more processors are further configured to execute the instructions to cause the apparatus to:
receive, from the network, a configuration indicating the multiple downlink reference signals as associated with the multiple uplink SRSs, and
determine the one or more downlink reference signals based at least in part on determining the one or more downlink reference signals associated with the one of the multiple uplink SRSs indicated for a given block in the configuration.
8 . The apparatus of claim 7 , wherein the one or more processors are configured to execute the instructions to cause the apparatus to receive the configuration in a radio resource control (RRC) signaling or a media access control (MAC) control element (CE).
9 . The apparatus of claim 7 , wherein one of the multiple uplink SRSs to transmit are indicated in a SRS request field of each of the set of blocks.
10 . The apparatus of claim 1 , wherein the one or more processors are further configured to execute the instructions to cause the apparatus to:
determine a timing offset between receiving the one or more downlink reference signals and transmitting the one or more of the multiple uplink SRSs; and
transmit the one or more of the multiple uplink SRSs based on the timing offset.
11 . The apparatus of claim 10 , wherein the one or more processors are configured to execute the instructions to cause the apparatus to determine the timing offset based on receiving, from the network, an indication of the timing offset.
12 . The apparatus of claim 11 , wherein the timing offset is relative to receiving the one or more downlink reference signals.
13 . The apparatus of claim 10 , wherein the one or more processors are configured to execute the instructions to cause the apparatus to determine the timing offset based on transmitting, to the network, a capability indication related to the timing offset.
14 . The apparatus of claim 1 , wherein at least the first CC and the second CC are different CCs.
15 . The apparatus of claim 1 , wherein the first CC, the second CC, and the third CC are the same CC.
16 . The apparatus of claim 1 , wherein the GC-DCI triggers transmitting the one or more of the multiple uplink SRSs.
17 . The apparatus of claim 1 , wherein the one or more processors are further configured to execute the instructions to cause the apparatus to transmit, to the network, for each block of the subset of the set of blocks, and based on the one or more downlink reference signals, the one or more of the multiple uplink SRSs.
18 . The apparatus of claim 1 , wherein the multiple downlink reference signals are tracking reference signals.
19 . An apparatus for wireless communication, comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the memory and the transceiver, wherein the one or more processors are configured to execute the instructions to cause the apparatus to:
transmit multiple downlink reference signals using multiple transmission/reception points (TRPs);
transmit, to a user equipment (UE) via at least one of the multiple TRPs, a group common (GC)-downlink control information (DCI) in a first component carrier (CC), wherein the GC-DCI includes a set of blocks for a group of multiple UEs, wherein the set of blocks includes multiple blocks, wherein each block of the multiple blocks indicates a different one of the multiple downlink reference signals associated with a different one of the multiple UEs, and wherein the GC-DCI indicates multiple uplink sounding reference signals (SRSs);
transmit, in a second CC, one or more of the multiple downlink reference signals; and
receive, from the UE, one or more of the multiple uplink SRSs that are associated with the one or more downlink reference signals on a third CC.
20 . The apparatus of claim 19 , wherein at least a first portion of a subset of the set of blocks intended for the UE each indicate one of the multiple downlink reference signals, and wherein at least a second portion of the subset of the set of blocks each indicate one of the multiple uplink SRSs.
21 . The apparatus of claim 20 , wherein the GC-DCI indicates a different one of the multiple uplink sounding reference signals (SRSs) associated with a different one of the multiple UEs.
22 . The apparatus of claim 20 , wherein the first portion of the subset of the set of blocks and the second portion of the subset of the set of blocks are interleaved in the subset of the set of blocks.
23 . The apparatus of claim 20 , wherein the second portion of the subset of the set of blocks includes a first consecutive portion of the subset of the set of blocks, and wherein the second portion of the subset of the set of blocks includes a second consecutive portion of the subset of the set of blocks that are subsequent to the first consecutive portion.
24 . The apparatus of claim 19 , wherein each block in the set of blocks indicates one of the multiple downlink reference signals and the one of multiple uplink SRSs associated with the one of the multiple downlink reference signals.
25 . The apparatus of claim 19 , wherein each block in the set of blocks indicates one of the multiple uplink SRSs to transmit, and wherein the one or more processors are further configured to execute the instructions to cause the apparatus to:
transmit, to the UE, a configuration indicating the multiple downlink reference signals as associated with the multiple uplink SRSs; and
receive the downlink reference signal includes receiving the downlink reference signal associated with the one of the multiple uplink SRSs indicated for a given block in the configuration.
26 . The apparatus of claim 19 , further comprising transmitting, to the UE, an indication of a timing offset to apply between receiving the downlink reference signal and transmitting the one or more of the multiple uplink SRSs.
27 . The apparatus of claim 19 , wherein at least the first CC and the second CC are different CCs.
28 . The apparatus of claim 19 , wherein the first CC, the second CC, and the third CC are the same CC.
29 . A method for wireless communications by a user equipment (UE), comprising:
receiving, from a network via at least one of multiple transmission/reception points (TRPs), a group common (GC)-downlink control information (DCI) in a first component carrier (CC), wherein the GC-DCI includes a set of blocks intended for multiple UEs, wherein the set of blocks includes multiple blocks, wherein each block of the multiple blocks indicates a different one of multiple downlink reference signals associated with a different one of the multiple UEs, and wherein the GC-DCI indicates multiple uplink sounding reference signals (SRSs);
receiving, based at least in part on the GC-DCI and a subset of the set of blocks that are intended for the UE, one or more downlink reference signals of multiple downlink reference signals over resources in a second CC, wherein the one or more downlink reference signals are associated with each block of the subset of the set of blocks; and
transmitting one or more of the multiple uplink SRSs that are associated with the one or more downlink reference signals on a third CC.
30 . The method of claim 29 , wherein at least a first portion of the subset of the set of blocks each indicate one of the multiple downlink reference signals, and wherein at least a second portion of the subset of the set of blocks each indicate one of the multiple uplink SRSs.
31 . A method for wireless communications, comprising:
transmitting multiple downlink reference signals using multiple transmission/reception points (TRPs);
transmitting, to a user equipment (UE) via at least one of the multiple TRPs, a group common (GC)-downlink control information (DCI) in a first component carrier (CC), wherein the GC-DCI includes a set of blocks for a group of multiple UEs, wherein the set of blocks includes multiple blocks, wherein each block of the multiple blocks indicates a different one of the multiple downlink reference signals associated with a different one of the multiple UEs, and wherein the GC-DCI indicates multiple uplink sounding reference signals (SRSs);
transmitting, in a second CC, one or more of the multiple downlink reference signals; and
receiving, from the UE, one or more of the multiple uplink SRSs that are associated with the one or more downlink reference signals on a third CC.