Downlink control information (DCI)-based triggered positioning reference signals (PRS)
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) receives, from a serving transmission-reception point (TRP), downlink control information (DCI) triggering the UE to measure positioning reference signals (PRS), wherein a code point in the DCI is associated with one or more PRS resources, one or more PRS resource sets, one or more positioning frequency layers, or one or more TRPs, and measures PRS transmitted on the one or more PRS resources, the one or more PRS resource sets, the one or more positioning frequency layers, or the one or more TRPs.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a serving transmission-reception point (TRP), downlink control information (DCI) triggering the UE to measure positioning reference signals (PRS), wherein a code point in the DCI is associated with one or more PRS resources, one or more PRS resource sets, one or more positioning frequency layers, or one or more TRPs, and wherein the code point is associated with at least one or more TRP-to-PRS resource set identifiers of the one or more TRPs; and
measuring PRS transmitted on the one or more PRS resources, the one or more PRS resource sets, the one or more positioning frequency layers, or the one or more TRPs, wherein the measuring comprises measuring all PRS transmitted on all PRS resources of at least one PRS resource set of the one or more PRS resource sets.
2 . The method of claim 1 , wherein:
the code point is associated with one or more triplets, each triplet consisting of a TRP-to-PRS resource set identifier, a PRS resource set identifier, and a PRS resource identifier,
each triplet is used to trigger one PRS resource, and
the measuring comprises measuring all PRS transmitted on all PRS resources of each PRS resource set of the one or more triplets.
3 . The method of claim 2 , wherein the TRP-to-PRS resource set identifier is defined such that it is associated with one or more downlink PRS resource sets from the same TRP.
4 . The method of claim 1 , wherein:
a field of a configuration of the one or more PRS resources contains the code point,
a field of a configuration of the one or more PRS resource sets contains the code point, or
a field of a configuration of the one or more positioning frequency layers contains the code point.
5 . The method of claim 1 , wherein:
the code point is associated with one or more tuples consisting of a TRP-to-PRS resource set identifier and a PRS resource set identifier,
each tuple is used to trigger one or more PRS resource sets, and
the measuring comprises measuring all PRS transmitted on all PRS resources of each PRS resource set of the one or more tuples.
6 . The method of claim 1 , wherein:
the code point is associated with one or more tuples consisting of a PRS resource set identifier and a PRS resource identifier,
each tuple is used to trigger one PRS resource, and
the measuring comprises measuring all PRS transmitted on all PRS resources of each PRS resource set of each of the one or more tuples.
7 . The method of claim 6 , wherein all PRS transmitted on all PRS resources of each of the one or more PRS resource sets are transmitted from one TRP.
8 . The method of claim 1 , wherein:
the code point is associated with one or more PRS resource set identifiers,
each PRS resource set identifier is used to trigger one PRS resource set, and
the measuring comprises measuring all PRS transmitted on all PRS resources of each of the one or more PRS resource sets.
9 . The method of claim 8 , wherein all PRS transmitted on all PRS resources of the one or more PRS resource sets are transmitted from one TRP.
10 . The method of claim 1 , wherein:
the code point is associated with one or more identifiers of the one or more positioning frequency layers, and
the measuring comprises measuring all PRS transmitted on all PRS resources of all PRS resource sets of the one or more positioning frequency layers.
11 . The method of claim 1 , wherein:
the measuring comprises measuring all PRS transmitted on all PRS resources of all PRS resource sets of a positioning frequency layer of the one or more TRPs.
12 . The method of claim 1 , wherein whether or not the code point is associated with one or more PRS resources, one or more PRS resource sets, one or more positioning frequency layers, or one or more TRPs is based on capabilities of the UE.
13 . The method of claim 1 , wherein a first value of the code point triggers the one or more PRS resources, a second value of the code point triggers the one or more PRS resource sets, a third value of the code point triggers the one or more positioning frequency layers, a fourth value of the code point triggers the one or more TRPs, or any combination thereof.
14 . The method of claim 13 , wherein the first value, the second value, the third value, and the fourth value triggering the one or more PRS resources, the one or more PRS resource sets, the one or more positioning frequency layers, and the one or more TRPs is based on capabilities of the UE.
15 . The method of claim 1 , wherein:
the code point is used to trigger a plurality of PRS resources spanning one or more positioning frequency layers, and
the code point is further associated with a measurement gap for the plurality of PRS resources based on the plurality of PRS resources spanning the one or more positioning frequency layers.
16 . The method of claim 15 , wherein the association of the code point to the measurement gap is implicit based on the plurality of PRS resources spanning the one or more positioning frequency layers.
17 . The method of claim 15 , wherein the association of the code point to the measurement gap is explicitly configured to the UE by the serving TRP or a location server.
18 . The method of claim 1 , wherein the DCI is common to a group of UEs, including the UE.
19 . The method of claim 18 , wherein the DCI includes a plurality of payload blocks, each of the plurality of payload blocks including one or more PRS indicators, each of the PRS indicators associated with a UE or a group of UEs.
20 . The method of claim 19 , wherein each PRS indicator triggers the associated UE or group of UEs to measure PRS on a set of one or more PRS resources, a set of one or more PRS resource sets, a set of one or more positioning frequency layers, a set of one or more TRPs, or any combination thereof.
21 . The method of claim 20 , wherein a second plurality of payload blocks includes indicators for measurement gaps for inter-frequency measurements of the PRS on the set of one or more PRS resources, the set of one or more PRS resource sets, the set of one or more positioning frequency layers, the set of one or more TRPs, or any combination thereof.
22 . A method of wireless communication performed by a transmission-reception point (TRP), comprising:
transmitting, to a user equipment (UE), downlink control information (DCI) triggering the UE to measure positioning reference signals (PRS), wherein a code point in the DCI is associated with one or more PRS resources, one or more PRS resource sets, one or more positioning frequency layers, or one or more TRPs, wherein the code point is associated with at least one or more TRP-to-PRS resource set identifiers of the one or more TRPs to trigger the UE to measure all PRS transmitted on all PRS resources of at least one PRS resource set of the one or more PRS resource sets; and
transmitting the PRS on the one or more PRS resources, the one or more PRS resource sets, the one or more positioning frequency layers, or the one or more TRPs.
23 . The method of claim 22 , wherein:
the code point is associated with one or more triplets, each triplet consisting of a TRP-to-PRS resource set identifier, a PRS resource set identifier, and a PRS resource identifier, and
each triplet is used to trigger one PRS resource.
24 . The method of claim 22 , wherein:
a field of a configuration of the one or more PRS resources contains the code point,
a field of a configuration of the one or more PRS resource sets contains the code point, or
a field of a configuration of the one or more positioning frequency layers contains the code point.
25 . The method of claim 22 , wherein:
the code point is associated with one or more tuples consisting of a TRP-to-PRS resource set identifier and a PRS resource set identifier, and
each tuple is used to trigger one or more PRS resource sets.
26 . The method of claim 22 , wherein:
the code point is associated with one or more tuples consisting of a PRS resource set identifier and a PRS resource identifier, and
each tuple is used to trigger one PRS resource.
27 . The method of claim 22 , wherein:
the code point is associated with one or more PRS resource set identifiers, and
each PRS resource set identifier is used to trigger one PRS resource set.
28 . The method of claim 22 , wherein:
the code point is associated with one or more identifiers of the one or more positioning frequency layers to trigger the UE to measure all PRS transmitted on all PRS resources of all PRS resource sets of the one or more positioning frequency layers.
29 . The method of claim 22 , wherein:
the code point is associated with the one or more TRP-to-PRS resource set identifiers of the one or more TRPs to trigger the UE to measure all PRS transmitted on all PRS resources of all PRS resource sets of a positioning frequency layer of the one or more TRPs.
30 . The method of claim 22 , wherein whether or not the DCI code point is associated with one or more PRS resources, one or more PRS resource sets, one or more positioning frequency layers, or one or more TRPs is based on capabilities of the UE.
31 . The method of claim 22 , wherein a first value of the code point triggers the one or more PRS resources, a second value of the code point triggers the one or more PRS resource sets, a third value of the code point triggers the one or more positioning frequency layers, a fourth value of the code point triggers the one or more TRPs, or any combination thereof.
32 . The method of claim 22 , wherein:
the code point is used to trigger a plurality of PRS resources spanning one or more positioning frequency layers, and
the code point is further associated with a measurement gap for the plurality of PRS resources based on the plurality of PRS resources spanning the one or more positioning frequency layers.
33 . A user equipment (UE), comprising:
one or more memories;
one or more transceivers; and
one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to:
receive, from a serving transmission-reception point (TRP) via the at least one transceiver, downlink control information (DCI) triggering the UE to measure positioning reference signals (PRS), wherein a code point in the DCI is associated with one or more PRS resources, one or more PRS resource sets, one or more positioning frequency layers, or one or more TRPs, and wherein the code point is associated with at least one or more TRP-to-PRS resource set identifiers of the one or more TRPs; and
measure PRS transmitted on the one or more PRS resources, the one or more PRS resource sets, the one or more positioning frequency layers, or the one or more TRPs, wherein the one or more processors configured to measure the PRS transmitted on the one or more PRS resources comprises the one or more processors, either alone or in combination, configured to measure all PRS transmitted on all PRS resources of at least one PRS resource set of the one or more PRS resource sets.
34 . A base station, comprising:
one or more memories;
one or more transceivers; and
one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to:
transmit, via the one or more transceivers, to a user equipment (UE), downlink control information (DCI) triggering the UE to measure positioning reference signals (PRS), wherein a code point in the DCI is associated with one or more PRS resources, one or more PRS resource sets, one or more positioning frequency layers, or one or more TRPs, wherein the code point is associated with at least one or more TRP-to-PRS resource set identifiers of the one or more TRPs to trigger the UE to measure all PRS transmitted on all PRS transmitted on all PRS resources of at least one PRS resource set of the one or more PRS resource sets; and
transmit, via the one or more transceivers, the PRS on the one or more PRS resources, the one or more PRS resource sets, the one or more positioning frequency layers, or the one or more TRPs.
35 . A user equipment (UE), comprising:
means for receiving, from a serving transmission-reception point (TRP), downlink control information (DCI) triggering the UE to measure positioning reference signals (PRS), wherein a code point in the DCI is associated with one or more PRS resources, one or more PRS resource sets, one or more positioning frequency layers, or one or more TRPs, and wherein the code point is associated with at least one or more TRP-to-PRS resource set identifiers of the one or more TRPs; and
means for measuring PRS transmitted on the one or more PRS resources, the one or more PRS resource sets, the one or more positioning frequency layers, or the one or more TRPs, wherein the means for measuring comprises means for measuring all PRS transmitted on all PRS resources of at least one PRS resource set of the one or more PRS resource sets.