Using medium access control control elements to schedule semi-persistent sounding reference signals for positioning

A method of wireless communication performed by a base station, comprising:

• transmitting, to a user equipment (UE), a medium access control control element (MAC-CE) indicating activation or deactivation of a semi-persistent (SP) sounding reference signal (SRS)-for-positioning, wherein a reserved bit in the MAC-CE or a logical channel identifier (LCD) of a MAC subheader of the MAC-CE indicates the activation or deactivation of the SP SRS-for-positioning, wherein the MAC-CE includes an identifier field from which an identifier (ID) of a spatial relation reference signal for the SP SRS-for-positioning can be determined, wherein a type of the spatial relation reference signal is one of (1) an SRS-for-communication resource, (2) a synchronization signal block (SSB), (3) a channel state information reference signal (CSI-RS) resource, (4) an SRS-for-positioning resource, or (5) a downlink positioning reference signal (DL PRS) resource, and wherein the identifier field includes three bits indicating whether the type of the spatial relation reference signal is the SRS-for-communication resource, the SRS-for-positioning resource, the SSB, the CSI-RS resource, or the DL PRS resource;
• and
• receiving, from the UE, the SP SRS-for-positioning on one or more SRS resources configured to the UE for transmission of the SP SRS-for-positioning, the SP SRS-for-positioning having transmission parameters adopted from the spatial relation reference signal.

A user equipment (UE), comprising:

• a memory;
• at least one transceiver;
• and
• at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
• receive, from a serving base station, a medium access control control element (MAC-CE) indicating activation or deactivation of a semi-persistent (SP) sounding reference signal (SRS)-for-positioning, wherein a reserved bit in the MAC-CE or a logical channel identifier (LCID) of a MAC subheader of the MAC-CE indicates the activation or deactivation of the SP SRS-for-positioning;
• and
• transmit the SP SRS-for-positioning on one or more SRS resources configured for the UE, the SP SRS-for-positioning having transmission parameters adopted from a spatial relation reference signal for the SP SRS-for-positioning, an identifier (ID) of the spatial relation reference signal determined based on an identifier field for the spatial relation reference signal in the MAC-CE, wherein a type of the spatial relation reference signal is one of (1) an SRS-for-communication resource, (2) a synchronization signal block (SSB), (3) a channel state information reference signal (CSI-RS) resource, (4) an SRS-for-positioning resource, or (5) a downlink positioning reference signal (DL PRS) resource, and wherein the identifier field includes three bits indicating whether the type of the spatial relation reference signal is the SRS-for-communication resource, the SRS-for-positioning resource, the SSB, the CSI-RS resource, or the DL PRS resource.

A base station, comprising:

• a memory;
• at least one transceiver;
• and
• at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
• transmit, to a user equipment (UE), a medium access control control element (MAC-CE) indicating activation or deactivation of a semi-persistent (SP) sounding reference signal (SRS)-for-positioning, wherein a reserved bit in the MAC-CE or a logical channel identifier (LCID) of a MAC subheader of the MAC-CE indicates the activation or deactivation of the SP SRS-for-positioning, wherein the MAC-CE includes an identifier field from which an identifier (ID) of a spatial relation reference signal for the SP SRS-for-positioning can be determined, wherein a type of the spatial relation reference signal is one of (1) an SRS-for-communication resource, (2) a synchronization signal block (SSB), (3) a channel state information reference signal (CSI-RS) resource, (4) an SRS-for-positioning resource, or (5) a downlink positioning reference signal (DL PRS) resource, and wherein the identifier field includes three bits indicating whether the type of the spatial relation reference signal is the SRS-for-communication resource, the SRS-for-positioning resource, the SSB, the CSI-RS resource, or the DL PRS resource;
• and
• receive, from the UE, the SP SRS-for-positioning on one or more SRS resources configured to the UE for transmission of the SP SRS-for-positioning, the SP SRS-for-positioning having transmission parameters adopted from the spatial relation reference signal.

A base station, comprising:

• means for transmitting, to a user equipment (UE), a medium access control control element (MAC-CE) indicating activation or deactivation of a semi-persistent (SP) sounding reference signal (SRS)-for-positioning, wherein a reserved bit in the MAC-CE or a logical channel identifier (LCID) of a MAC subheader of the MAC-CE indicates the activation or deactivation of the SP SRS-for-positioning, wherein the MAC-CE includes an identifier field from which an identifier (ID) of a spatial relation reference signal for the SP SRS-for-positioning can be determined, wherein a type of the spatial relation reference signal is one of (1) an SRS-for-communication resource, (2) a synchronization signal block (SSB), (3) a channel state information reference signal (CSI-RS) resource, (4) an SRS-for-positioning resource, or (5) a downlink positioning reference signal (DL PRS) resource, and wherein the identifier field includes three bits indicating whether the type of the spatial relation reference signal is the SRS-for-communication resource, the SRS-for-positioning resource, the SSB, the CSI-RS resource, or the DL PRS resource;
• and
• means for receiving, from the UE, the SP SRS-for-positioning on one or more SRS resources configured to the UE for transmission of the SP SRS-for-positioning, the SP SRS-for-positioning having transmission parameters adopted from the spatial relation reference signal.

A non-transitory computer-readable medium storing computer-executable instructions, the computer-executable instructions comprising:

• at least one instruction instructing a user equipment (UE) to receive, from a serving base station, a medium access control control element (MAC-CE) indicating activation or deactivation of a semi-persistent (SP) sounding reference signal (SRS)-for-positioning, wherein a reserved bit in the MAC-CE or a logical channel identifier (LCID) of a MAC subheader of the MAC-CE indicates the activation or deactivation of the SP SRS-for-positioning;
• and
• at least one instruction instructing the UE to transmit the SP SRS-for-positioning on one or more SRS resources configured for the UE, the SP SRS-for-positioning having transmission parameters adopted from a spatial relation reference signal for the SP SRS-for-positioning, an identifier (ID) of the spatial relation reference signal determined based on an identifier field for the spatial relation reference signal in the MAC-CE, wherein a type of the spatial relation reference signal is one of (1) an SRS-for-communication resource, (2) a synchronization signal block (SSB), (3) a channel state information reference signal (CSI-RS) resource, (4) an SRS-for-positioning resource, or (5) a downlink positioning reference signal (DL PRS) resource, and wherein the identifier field includes three bits indicating whether the type of the spatial relation reference signal is the SRS-for-communication resource, the SRS-for-positioning resource, the SSB, the CSI-RS resource, or the DL PRS resource.

A non-transitory computer-readable medium storing computer-executable instructions, the computer-executable instructions comprising:

• at least one instruction instructing a base station to transmit, to a user equipment (UE), a medium access control control element (MAC-CE) indicating activation or deactivation of a semi-persistent (SP) sounding reference signal (SRS)-for-positioning, wherein a reserved bit in the MAC-CE or a logical channel identifier (LCID) of a MAC subheader of the MAC-CE indicates the activation or deactivation of the SP SRS-for-positioning, wherein the MAC-CE includes an identifier field from which an identifier (ID) of a spatial relation reference signal for the SP SRS-for-positioning can be determined, wherein a type of the spatial relation reference signal is one of (1) an SRS-for-communication resource, (2) a synchronization signal block (SSB), (3) a channel state information reference signal (CSI-RS) resource, (4) an SRS-for-positioning resource, or (5) a downlink positioning reference signal (DL PRS) resource, and wherein the identifier field includes three bits indicating whether the type of the spatial relation reference signal is the SRS-for-communication resource, the SRS-for-positioning resource, the SSB, the CSI-RS resource, or the DL PRS resource;
• and
• at least one instruction instructing the base station to receive, from the UE, the SP SRS-for-positioning on one or more SRS resources configured to the UE for transmission of the SP SRS-for-positioning, the SP SRS-for-positioning having transmission parameters adopted from the spatial relation reference signal.