Group-based channel state information reference signal (CSI-RS) transmission
Systems, apparatuses, methods, and computer-readable media are provided for channel state information (CSI)-reference signal (RS) triggering for multiple user equipments (UEs) using a single downlink control information (DCI). In some embodiments, a new radio network temporary identifier (RNTI) may be used to indicate triggering of CSI-RS transmission for multiple UEs. Additionally, or alternatively, a new DCI format may be used that supports CSI-RS triggering for multiple UEs. The techniques described herein may provide reduced DCI overhead compared with prior techniques. Other embodiments may be described and claimed.
1 . One or more non-transitory computer-readable media (NTCRM) having instructions, stored thereon, that when executed by one or more processors cause a user equipment (UE) to:
receive, from a next generation Node B (gNB), configuration information for a downlink control information (DCI) that is to trigger an aperiodic channel state information (CSI)-reference signal (RS) for a plurality of UEs;
receive the DCI, wherein the DCI includes a plurality of blocks of bits to trigger respective aperiodic CSI-RSs for respective groups of UEs, and wherein the configuration information assigns the UE to a specific block of the plurality of blocks of bits; and
receive the aperiodic CSI-RS based on the specific block of the DCI and the configuration information.
2 . The one or more NTCRM of claim 1 , wherein the aperiodic CSI-RS is a first aperiodic CSI-RS, wherein the DCI includes a plurality of blocks of bits to trigger respective aperiodic CSI-RSs including the first aperiodic CSI-RS, and wherein the configuration information indicates a first block, of the plurality of blocks of bits, to which the UE is assigned.
3 . The one or more NTCRM of claim 2 , wherein the first block indicates a triggered CSI-RS resource associated with the first aperiodic CSI-RS.
4 . The one or more NTCRM of claim 3 , wherein the triggered CSI-RS resource is a CSI-RS resource set for CSI-RS repetitions or tracking reference signal information (trs-info).
5 . The one or more NTCRM of claim 2 , wherein the first block indicates a component carrier on which the first aperiodic CSI-RS is to be transmitted.
6 . The one or more NTCRM of claim 2 , wherein the first block further includes information for a sounding reference signal (SRS) associated with the first CSI-RS, and wherein the instructions, when executed, are further to cause the UE to encode the SRS for transmission based on the information.
7 . The one or more NTCRM of claim 6 , wherein the configuration information is to configure a radio network temporary identifier (RNTI) that is used to trigger the aperiodic CSI-RS for the plurality of UEs.
8 . The one or more NTCRM of claim 7 , wherein the DCI has a DCI format 0_1 or a DCI format 0_2, and wherein the DCI includes a uplink (UL)-shared channel (SCH) indicator that indicates no physical uplink shared channel (PUSCH) transmission is scheduled by the DCI.
9 . One or more non-transitory computer-readable media (NTCRM) having instructions, stored thereon, that when executed by one or more processors cause a next generation Node B (gNB) to:
encode, for transmission to a plurality of user equipments (UEs), a downlink control information (DCI) to trigger one or more aperiodic channel state information (CSI)-reference signals (RSs) for the plurality of UEs, wherein the DCI includes a plurality of blocks of bits to trigger respective aperiodic CSI-RSs for respective groups of UEs; and
encode the one or more aperiodic CSI-RS for transmission based on the DCI.
10 . The one or more NTCRM of claim 9 , wherein the one or more aperiodic CSI-RS is a plurality of aperiodic CSI-RSs, wherein the DCI includes a plurality of blocks of bits to trigger the respective aperiodic CSI-RSs.
11 . The one or more NTCRM of claim 10 , wherein the instructions, when executed, are further to cause the gNB to encode, for transmission to the plurality of UEs, configuration information to assign the plurality of UEs to respective blocks of the plurality of blocks of bits.
12 . The one or more NTCRM of claim 10 , wherein individual blocks of the plurality of blocks of bits indicate at least one of a CSI-RS resource or a component carrier associated with the respective aperiodic CSI-RS.
13 . The one or more NTCRM of claim 12 , wherein the individual blocks include the CSI-RS resource, and wherein the CSI-RS resource is a CSI-RS resource set for CSI-RS repetitions or tracking reference signal information (trs-info).
14 . The one or more NTCRM of claim 10 , wherein one or more of the blocks of bits includes information for a sounding reference signal (SRS) associated with the corresponding aperiodic CSI-RS.
15 . The one or more NTCRM of claim 9 , wherein the DCI includes a radio network temporary identifier (RNTI) that is used to trigger the aperiodic CSI-RS for the plurality of UEs.
16 . The one or more NTCRM of claim 15 , wherein the DCI has a DCI format 0_1 or a DCI format 0_2, and wherein the DCI includes a uplink (UL)-shared channel (SCH) indicator that indicates no physical uplink shared channel (PUSCH) transmission is scheduled by the DCI.
17 . An apparatus to be implemented in a user equipment (UE), the apparatus comprising:
processor circuitry to:
receive, from a next generation Node B (gNB), configuration information for a downlink control information (DCI) that includes a plurality of blocks of bits to trigger respective aperiodic channel state information (CSI)-reference signals (RSs) for respective groups of one or more UEs, wherein the configuration information assigns the UE to a first block, of the plurality of blocks of bits;
receive the DCI to trigger a first aperiodic CSI-RS; and
receive the first aperiodic CSI-RS based on the assigned first block of the DCI; and
a memory to store an identifier of the first block.
18 . The apparatus of claim 17 , wherein the first block indicates at least one of a CSI-RS resource or a component carrier associated with the first aperiodic CSI-RS.
19 . The apparatus of claim 17 , wherein the first block further includes information for a sounding reference signal (SRS) associated with the first aperiodic CSI-RS, and wherein the processor circuitry is further to encode the SRS for transmission based on the information.
20 . The apparatus of claim 17 , wherein the configuration information is to configure a radio network temporary identifier (RNTI) that is used to trigger the first aperiodic CSI-RS for multiple UEs of the plurality of UEs.