TRS for multicast and broadcast
A base station may transmit a broadcast/multicast service in a multicast broadcast single frequency network (MBSFN) area multicast communication. A method of wireless communication at a base station in accordance with an aspect of the present disclosure comprises determining a broadcast/multicast service to be provided to a user equipment (UE) in a multicast broadcast single frequency network (MBSFN) area, and transmitting a tracking reference signal (TRS) to the UE, the TRS indicating information associated with receiving the broadcast/multicast service by the UE.
1 . A method of wireless communication at a first cell, comprising:
establishing a connection with a user equipment (UE);
transmitting information about a tracking reference signal (TRS) for a second cell to the UE; and
transmitting a configuration for a virtual synchronization signal block (SSB) for the second cell, wherein the virtual SSB utilizes a raster that is different than a synchronization raster, wherein the virtual SSB is quasi-co-located with the TRS using a same virtual cell identifier.
2 . The method of claim 1 , wherein the first cell comprises a source cell serving the UE and the second cell comprises a target cell.
3 . The method of claim 1 , wherein the information comprises a configuration for the TRS from the second cell, and wherein the information is signaled in radio resource control (RRC) signaling from the first cell.
4 . The method of claim 1 , wherein the information comprises downlink (DL) downlink control information (DCI) comprising a cell radio network temporary identifier (C-RNTI) from the first cell that triggers an aperiodic TRS at the second cell before a downlink multicast transmission.
5 . The method of claim 1 , wherein the TRS is an aperiodic TRS, and wherein the information indicates at least one slot offset from a downlink (DL) downlink control information (DCI) for the TRS from the second cell that is different than a slot offset for the first cell.
6 . The method of claim 1 , wherein the TRS is an aperiodic TRS, and wherein the information indicates an additional intercell slot offset from a downlink (DL) downlink control information (DCI) for the TRS from the second cell.
7 . The method of claim 1 , wherein the TRS is an aperiodic TRS, and wherein a downlink (DL) downlink control information (DCI) that triggers the aperiodic TRS schedules a multicast data transmission on a different bandwidth part.
8 . The method of claim 1 , wherein the TRS is an aperiodic TRS, and wherein a downlink (DL) downlink control information (DCI) that triggers the aperiodic TRS schedules a unicast data transmission on a different bandwidth part.
9 . The method of claim 1 , wherein the TRS is an aperiodic TRS, and wherein a downlink (DL) downlink control information (DCI) that triggers the aperiodic TRS schedules an initial transmission on a different bandwidth part.
10 . The method of claim 1 , wherein the TRS is an aperiodic TRS, and wherein a downlink (DL) downlink control information (DCI) that triggers the aperiodic TRS schedules a retransmission on a different bandwidth part.
11 . The method of claim 1 , wherein the virtual SSB comprises a semi-persistent SSB.
12 . The method of claim 1 , wherein transmitting the virtual SSB comprises transmitting the virtual SSB in periodic bursts.
13 . A method of wireless communication at a user equipment (UE), comprising:
establishing a connection with a first cell;
receiving information from the first cell about a tracking reference signal (TRS) for a second cell; and
receiving a configuration for a virtual synchronization signal block (SSB) for the second cell, wherein the virtual SSB utilizes a raster that is different than a synchronization raster, wherein the virtual SSB is quasi-co-located with the TRS using a same virtual cell identifier.
14 . The method of claim 13 , wherein the first cell comprises a source cell serving the UE and the second cell comprises a target cell in a different multicast area.
15 . The method of claim 13 , wherein the information comprises a configuration for the TRS from the second cell, and wherein the information is signaled in radio resource control (RRC) signaling from the first cell.
16 . The method of claim 13 , wherein the information comprises downlink (DL) downlink control information (DCI) comprising a cell radio network temporary identifier (C-RNTI) from the first cell that triggers an aperiodic TRS at the second cell before a downlink multicast transmission.
17 . The method of claim 13 , wherein the TRS is an aperiodic TRS, and wherein the information indicates at least one slot offset from a downlink (DL) downlink control information (DCI) for the TRS from the second cell that is different than a slot offset for the first cell.
18 . The method of claim 13 , wherein the TRS is an aperiodic TRS, and wherein the information indicates an additional intercell slot offset from a downlink (DL) downlink control information (DCI) for the TRS from the second cell.
19 . The method of claim 13 , wherein the TRS is an aperiodic TRS, and wherein a downlink (DL) downlink control information (DCI) that triggers the aperiodic TRS schedules a multicast data transmission on a different bandwidth part.
20 . The method of claim 13 , wherein the TRS is an aperiodic TRS, and wherein a downlink (DL) downlink control information (DCI) that triggers the aperiodic TRS schedules a unicast data transmission on a different bandwidth part.
21 . The method of claim 13 , wherein the TRS is an aperiodic TRS, and wherein a downlink (DL) downlink control information (DCI) that triggers the aperiodic TRS schedules an initial transmission on a different bandwidth part.
22 . The method of claim 13 , wherein the TRS is an aperiodic TRS, and wherein a downlink (DL) downlink control information (DCI) that triggers the aperiodic TRS schedules a retransmission on a different bandwidth part.
23 . The method of claim 13 , wherein the virtual SSB comprises a semi-persistent SSB.
24 . The method of claim 13 , wherein receiving the virtual SSB comprises receiving the virtual SSB in periodic bursts.
25 . An apparatus for wireless communication at a first cell, comprising:
one or more memories storing computer-executable instructions; and
one or more processors coupled to the one or more memories and configured to, individually or in combination, execute the instruction to cause the apparatus to:
establish a connection with a user equipment (UE);
transmit information about a tracking reference signal (TRS) for a second cell to the UE; and
transmit a configuration for a virtual synchronization signal block (SSB) for the second cell, wherein the virtual SSB utilizes a raster that is different than a synchronization raster, wherein the virtual SSB is quasi-co-located with the TRS using a same virtual cell identifier.
26 . An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories storing computer-executable instructions; and
one or more processors coupled to the one or more memories and configured to, individually or in combination, execute the instruction to cause the apparatus to:
establish a connection with a first cell;
receive information from the first cell about a tracking reference signal (TRS) for a second cell; and
receive a configuration for a virtual synchronization signal block (SSB) for the second cell, wherein the virtual SSB utilizes a raster that is different than a synchronization raster, wherein the virtual SSB is quasi-co-located with the TRS using a same virtual cell identifier.