Sounding reference signal configuration for antenna switching and carrier switching
Systems, apparatuses, methods, and computer-readable media are provided for SRS configuration for antenna switching and/or carrier switching. The described techniques may be used in multi-TRP and/or single TRP communication. Also described are techniques for beam configuration for SRS with antenna switching. For example, embodiments provide techniques for beam configuration/update for SRS antenna switching considering the beam change signaling received during the antenna switching procedure. 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 configuration information for a first sounding reference signal (SRS) resource set; a second SRS resource set, and a third SRS resource set, the first and second sets of SRS resource sets being semi-persistent (SP) SRS resource sets, the third SRS resource set being a periodic SRS resource set, the first, second and third SRS resource sets configured for antenna switching, wherein the configuration information includes spatial relation information for the SRS resource sets;
receive a medium access control (MAC) control element (CE) (MAC-CE) to activate one or more of the SRS resource sets; and
transmit SRSs with antenna switching based on the activated one or more SRS resource sets,
wherein one of the SRS resource sets is configured with an SRS power control state set to ‘separateClosedLoop’, and
wherein one of the SRS resource sets is configured for carrier-based SRS switching.
2 . 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 configuration information for a first set of one or more sounding reference signal (SRS) resource sets and a second set of one or more SRS resource sets, wherein the first set is associated with a first transmission-reception point (TRP) and the second set is associated with a second TRP;
receive a message to activate one or both of the first and second set of SRS resource sets; and
transmit one or more SRSs with antenna switching based on the activated SRS resource sets,
wherein the configuration information is further to configure a third set of SRS resource sets for carrier switching, wherein the SRS resource sets of the third set of SRS resource sets are configured with a usage set to ‘antennaSwitching’ and an SRS power control state set to ‘separateClosedLoop’.
3 . The one or more NTCRM of claim 2 , wherein the SRS resource sets of the first and second sets of SRS resource sets are semi-persistent SRS resource sets.
4 . The one or more NTCRM of claim 3 , wherein the message is a medium access control (MAC) control element (CE) or a downlink control information (DCI).
5 . The one or more NTCRM of claim 2 , wherein the configuration information includes one or more power control parameters associated with the respective SRS resource sets of the first and second sets of SRS resource sets.
6 . The one or more NTCRM of claim 5 , wherein the one or more power control parameters include one or more of: an SRS power control adjustment state, a pathloss reference signal, a P0 parameter, an alpha parameter, or a spatial relation.
7 . The one or more NTCRM of claim 2 , wherein the SRS resource sets of at least one of the first or second sets have SRS resource sets with different xTyR configurations, and wherein the SRS resource sets with different xTyR configurations have different trigger states.
8 . The one or more NTCRM of claim 2 , wherein the instructions, when executed, are further to cause the UE to receive a medium access control (MAC) control element (CE) to reconfigure SRS resources of at least one of the SRS resource sets for a different xTyR configuration.
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 user equipment (UE), configuration information for a plurality of sounding reference signal (SRS) resource sets associated with a transmission-reception point (TRP) and configured for antenna switching, wherein all SRS resources of the plurality of SRS resource sets have a same transmission configuration indicator (TCI) state; and
receive, from the UE, one or more SRSs with antenna switching based on the configuration information,
wherein the TCI state is a first TCI state, and wherein the instructions, when executed, are further to cause the gNB to, during a time period that encompasses all SRS resources of all the SRS resource sets, transmit a downlink control information (DCI) to indicate a second TCI state associated with the TRP;
wherein:
the second TCI state is not to be valid until after the time period and is not to be used by the UE to transmit any remaining SRSs during the time period;
the second TCI state is discarded by the UE;
the second TCI state becomes valid during the time period but is not to be applied by the UE for any remaining SRSs during the time period; or
the second TCI state becomes valid and is to be applied by the UE for any remaining SRSs during the time period.
10 . The one or more NTCRM of claim 9 , wherein the TCI state is a joint downlink (DL)/uplink (UL) TCI state or a separate UL TCI state.
11 . The one or more NTCRM of claim 9 , wherein the instructions, when executed, are further to cause the gNB to determine that, during a time period that encompasses all SRS resources of all the SRS resource sets, the gNB is not to transmit a downlink control information (DCI) to indicate another TCI state associated with the TRP.
12 . The one or more NTCRM of claim 9 , wherein the TCI state is a first TCI state and wherein the instructions, when executed, are further to cause the gNB to transmit a downlink control information (DCI) to indicate a second TCI state associated with the TRP, wherein the second TCI state is to be applied by the UE for the one or more SRSs if a time period between when the UE receives the DCI and an earliest SRS resource of the plurality of SRS resource sets is less than a beam application time.