Methods, apparatus, and devices for uplink spatial relation indication and power control for pathloss
Embodiments are presented herein of apparatuses, systems, and methods for a user equipment device (UE) to perform power control for uplink (UL) reference signals (RS). A UE may determine spatial configuration for UL RS based on another communication. A UE may determine an updated pathloss within a reduced implementation following an update of downlink (DL) RS. A UE may reset a power control factor in response to receiving an update.
1 . A method, comprising:
determining that a spatial relation between a reference signal and an uplink signal is not configured by a cellular network for a user equipment (UE);
determining that downlink reference signals for pathloss are not provided by the cellular network for the UE;
selecting a particular spatial filter for the uplink signal based at least in part on the determination that the spatial relation between the reference signal and the uplink signal is not configured and the determination that downlink reference signals for pathloss are not provided, wherein the particular spatial filter is associated with a spatial filter used for a downlink communication; and
transmitting the uplink signal using the particular spatial filter.
2 . The method of claim 1 , wherein the uplink signal comprises sounding reference signal (SRS).
3 . The method of claim 1 , wherein the uplink signal comprises physical uplink control channel (PUCCH).
4 . The method of claim 1 , wherein the downlink communication comprises physical downlink shared channel (PDSCH).
5 . The method of claim 1 , wherein the downlink communication comprises physical downlink control channel (PDCCH).
6 . The method of claim 1 , wherein the downlink communication comprises a communication in a recent slot.
7 . The method of claim 6 , wherein the recent slot is offset by K slots from a current slot and wherein K is configured by higher layer signaling.
8 . A method, comprising:
at a cellular network:
communicating with a user equipment (UE);
receiving, from the UE, an uplink signal using a particular spatial filter associated with a spatial filter used for a downlink communication, wherein:
a spatial relation between a reference signal and an uplink signal is not configured for the UE; and
downlink reference signals for pathloss are not provided by the cellular network for the UE.
9 . The method of claim 8 , wherein the uplink signal comprises sounding reference signal (SRS).
10 . The method of claim 8 , wherein the uplink signal comprises physical uplink control channel (PUCCH).
11 . The method of claim 8 , wherein the downlink communication comprises physical downlink shared channel (PDSCH).
12 . The method of claim 8 , wherein the downlink communication comprises physical downlink control channel (PDCCH).
13 . The method of claim 8 , wherein the downlink communication comprises a communication in a recent slot.
14 . The method of claim 13 , wherein the recent slot is offset by K slots from a current slot and wherein K is configured by higher layer signaling.
15 . An apparatus, comprising:
a processor configured to, when executing instructions stored in a memory, to perform operations comprising:
determining that a spatial relation between a reference signal and an uplink signal is not configured by a cellular network for a user equipment (UE);
determining that downlink reference signals for pathloss are not provided by the cellular network for the UE;
selecting a particular spatial filter for the uplink signal based at least in part on the determination that the spatial relation between the reference signal and the uplink signal is not configured and the determination that downlink reference signals for pathloss are not provided, wherein the particular spatial filter is associated with a spatial filter used for a downlink communication; and
transmitting the uplink signal using the particular spatial filter.
16 . The apparatus of claim 15 , wherein the uplink signal comprises sounding reference signal (SRS).
17 . The apparatus of claim 15 , wherein the uplink signal comprises physical uplink control channel (PUCCH).
18 . The apparatus of claim 15 , wherein the downlink communication comprises physical downlink shared channel (PDSCH).
19 . The apparatus of claim 15 , wherein the downlink communication comprises physical downlink control channel (PDCCH).
20 . The apparatus of claim 15 , further comprising a radio communicatively coupled to the processor.