Multiple P-MPR reporting for maximum permissible exposure
Methods ( 300, 400 ) and apparatuses for MPE P-MPR reporting are disclosed. In one embodiment, a method ( 300 ) of a UE comprises selecting, in response to MPE event being detected, N SSB or CSI-RS resources according to the virtual PH of each SSB or CSI-RS resource within a candidate resource pool for a cell, where N is an integer equal to or larger than 1, wherein each virtual PH is computed by (I) where (II) is computed assuming MPR=0 dB, A-MPR=0 dB, ΔT c =0 and P-MPR is the virtual P-MPR of there source, PL (q d ) is the DL channel pathloss calculated by taking the SSB or CSI-RS resource as the PL-RS, P O_PUSCH, b, f, c and α are obtained by the power control parameters used for PUSCH associated with the current indicated UL TCI state with separate DL and UL TCI or the joint DL/UL TCI state with joint DL/UL TCI, or it is assumed that P O_PUSCH, b, f, c =0 and α=1, and f b, f, c =0 ( 302 ); and transmitting an MPE MAC CE including P-MPR of the MPE event and N pairs of virtual P-MPR and SSBRI or CRI, each SSBRI or CRI corresponds to one of the selected N SSB or CSI-RS resources ( 304 ).
1 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
transmit a capability on a maximum number of synchronization signal and physical broadcast channel (PBCH) block (SSB) or channel state information reference signal (CSI-RS) resources that can be configured in a resource pool for maximum permissible exposure (MPE) detection; and
transmit a MPE medium access control (MAC) control element (MAC CE) including:
a first field, where if mpe-Reporting-FR2 is configured indicating that MPE detection is enabled, and a serving cell operates on frequency range 2 (FR2), the first field has a value of 0 if an estimated power management maximum power reduction (P-MPR) value, to meet MPE requirements, is less than a first P-MPR value, and a value of 1 if the estimated P-MPR value is not less than the first P-MPR value,
a second field, where if mpe-Reporting-FR2 is configured, and the serving cell operates on FR2, and if the first field has a value of 1, the second field indicates an applied power backoff to meet the MPE requirements,
a third field that indicates a synchronization signal (SS)/PBCH block indicator (SSBRI) or CSI-RS resource indicator (CRI), which indicates an SSB or CSI-RS resource configured in a candidate resource pool for the serving cell.
2 . The UE of claim 1 , wherein the first P-MPR value comprises P-MPR_00.
3 . The UE of claim 1 , wherein the third field comprises a CSI-RS resource field that indicates the CSI-RS resource.
4 . The UE of claim 1 , wherein the third field comprises a ID resource ID field that indicates the SSB resource.
5 . The UE of claim 1 , wherein the MPE MAC CE includes one additional bit for each pair of virtual P-MPR and SSBRI or CRI to indicate whether the virtual P-MPR is less than 3 dBm.
6 . The UE of claim 1 , wherein each SSB or CSI-RS resource is indicated by an SSBRI or CRI field that has a bit width depending on a maximum number of SSB or CSI-RS resources within the candidate resource pool for the serving cell.
7 . The UE of claim 1 , wherein the at least one processor is further configured to cause the UE to:
determine an uplink (UL) transmission configuration indication (TCI) state or an UL transmitter (TX) beam for UL transmission after transmitting the MPE MAC CE.
8 . The UE of claim 7 , wherein the at least one processor is further configured to cause the UE to, after Y symbols from a last symbol of reception of a physical downlink control channel (PDCCH) carrying a downlink control information (DCI) that has a toggled new data indicator (NDI) field value:
schedule a physical uplink shared channel (PUSCH) transmission with a same hybrid automatic repeat request (HARQ) process number as that for the transmission of a PUSCH carrying the MPE MAC CE, wherein the UL TCI state includes, as a spatial relation, a downlink (DL) reference signal (RS) indicated by one or more SSBRIs or CRIs, wherein the indicated SSB or CSI-RS resource that is included in the UL TCI state for UL transmission is determined as a common UL TCI state, and Y is preconfigured or reported as part of UE capability.
9 . The UE of claim 7 , wherein the at least one processor is further configured to cause the UE to, after Y symbols from a last symbol of reception of a physical downlink control channel (PDCCH) carrying a downlink control information (DCI) that has a toggled new data indicator (NDI) field value:
schedule a physical uplink shared channel (PUSCH) transmission with a same hybrid automatic repeat request (HARQ) process number as that for transmission of a PUSCH carrying the MPE MAC CE, wherein the SSB or CSI-RS resource indicated by a first reported SSBRI or CRI is used to determine an UL TX beam for PUSCH and PUCCH transmission before receiving a joint downlink (DL)/UL TCI state updating command or a UL TCI state updating command, and Y is preconfigured or reported as part of UE capability.
10 . The UE of claim 1 , wherein the at least one processor is further configured to cause the UE to:
receive a downlink control information (DCI) to trigger an aperiodic channel state information (CSI) reporting for uplink (UL) beam management after transmitting the MPE MAC CE.
11 . The UE of claim 10 , wherein the triggered aperiodic CSI reporting is associated with an aperiodic CSI resource set including at least one CSI-RS resource with a higher layer parameter repetition set to on, and the at least one CSI-RS resource is:
a CSI-RS resource indicated by an SSBRI/CRI field of the MPE MAC CE, or
quasi co-located (QCLed) with an SSB or CSI-RS resource indicated by the SSBRI/CRI field of the MPE MAC CE, or
a CSI-RS resource that has a same source QCL-TypeD RS as a CSI-RS resource indicated by the SSBRI/CRI field of the MPE MAC CE.
12 . A processor for wireless communication, comprising:
at least one controller coupled with at least one memory and configured to cause the processor to:
transmit a capability on a maximum number of synchronization signal and physical broadcast channel (PBCH) block (SSB) or channel state information reference signal (CSI-RS) resources that can be configured in a resource pool for maximum permissible exposure (MPE) detection; and
transmit a MPE medium access control (MAC) control element (MAC CE) including:
a first field, where if mpe-Reporting-FR2 is configured indicating that MPE detection is enabled, and a serving cell operates on frequency range 2 (FR2), the first field has a value of 0 if an estimated power management maximum power reduction (P-MPR) value, to meet MPE requirements, is less than a first P-MPR value, and a value of 1 if the estimated P-MPR value is not less than the first P-MPR value,
a second field, where if mpe-Reporting-FR2 is configured, and the serving cell operates on FR2, and if the first field has a value of 1, the second field indicates an applied power backoff to meet the MPE requirements,
a third field that indicates a synchronization signal (SS)/PBCH block indicator (SSBRI) or CSI-RS resource indicator (CRI), which indicates an SSB or CSI-RS resource configured in a candidate resource pool for the serving cell.
13 . The processor of claim 12 , wherein the first P-MPR value comprises P-MPR_00.
14 . The processor of claim 12 , wherein the third field comprises a CSI RS resource field that indicates the CSI-RS resource.
15 . The processor of claim 12 , wherein the third field comprises a ID resource ID field that indicates the SSB resource.
16 . A base station for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the base station to:
receive a capability on a maximum number of synchronization signal and physical broadcast channel (PBCH) block (SSB) or channel state information reference signal (CSI-RS) resources that can be configured in a resource pool for maximum permissible exposure (MPE) detection; and
receive a MPE medium access control (MAC) control element (MAC CE) including:
a first field, where if mpe-Reporting-FR2 is configured indicating that MPE detection is enabled, and a serving cell operates on frequency range 2 (FR2), the first field has a value of 0 if an estimated power management maximum power reduction (P-MPR) value, to meet MPE requirements, is less than a first P-MPR value, and a value of 1 if the estimated P-MPR value is not less than the first P-MPR value,
a second field, where if mpe-Reporting-FR2 is configured, and the serving cell operates on FR2, and if the first field has a value of 1, the second field indicates an applied power backoff to meet the MPE requirements,
a third field that indicates a synchronization signal (SS)/PBCH block indicator (SSBRI) or CSI-RS resource indicator (CRI), which indicates an SSB or CSI-RS resource configured in a candidate resource pool for the serving cell.
17 . The base station of claim 16 , wherein the first P-MPR value comprises P-MPR_00.
18 . The base station of claim 16 , wherein the third field comprises a CSI-RS resource field that indicates the CSI-RS resource.
19 . The base station of claim 16 , wherein the third field comprises a ID resource ID field that indicates the SSB resource.
20 . A method performed by a user equipment (UE), the method comprising:
transmitting a capability on a maximum number of synchronization signal and physical broadcast channel (PBCH) block (SSB) or channel state information reference signal (CSI-RS) resources that can be configured in a resource pool for maximum permissible exposure (MPE) detection; and
transmitting a MPE medium access control (MAC) control element (MAC CE) including:
a first field, where if mpe-Reporting-FR2 is configured indicating that MPE detection is enabled, and a serving cell operates on frequency range 2 (FR2), the first field has a value of 0 if an estimated power management maximum power reduction (P-MPR) value, to meet MPE requirements, is less than a first P-MPR value, and a value of 1 if the estimated P-MPR value is not less than the first P-MPR value,
a second field, where if mpe-Reporting-FR2 is configured, and the serving cell operates on FR2, and if the first field has a value of 1, the second field indicates an applied power backoff to meet the MPE requirements,
a third field that indicates a I synchronization signal (SS)/PBCH block indicator (SSBRI) or CSI-RS resource indicator (CRI), which indicates an SSB or CSI-RS resource configured in a candidate resource pool for the serving cell.