Spatial domain measurements for beam based positioning
Various example embodiments relate to positioning of a target node. A positioning report may comprise positioning assistance measurements from the target node and at least one anchor node, wherein the positioning assistance measurements are associated with angular differences between a pair of uplink and/or downlink transmission and/or reception beam directions. Apparatuses, methods, and computer pro-grams are disclosed.
1. An apparatus, comprising:
at least one processor; and
at least one memory including computer program code;
the at least one memory and the computer code configured to, with the at least one processor, cause the apparatus at least to:
receive, at a target node, a positioning measurement configuration from a network node;
connect to a plurality of anchor nodes with a pair of uplink transmission and/or downlink reception beams, wherein the uplink transmission and/or downlink reception beam angles comprise an antenna panel orientation of the target node;
compute at least one positioning assistance measurement of the target node comprising an angular difference between the pair of uplink transmission and/or downlink reception beam directions based on the positioning measurement configuration,
wherein the at least one positioning assistance measurement is determined in a global coordinate system with respect to at least one relative global coordinate reference point comprising a cartesian coordinate point or a polar coordinate point,
wherein the at least one positioning assistance measurement is determined in an azimuth domain and an elevation domain,
wherein the at least one positioning assistance measurement comprises an angular difference between an uplink transmission or downlink reception beam angle to/from one anchor node and resource an uplink transmission or downlink reception beam angle to/from another anchor node in a local coordinate system, and
wherein the apparatus is configured to determine which pair of uplink transmission and/or downlink reception beams associated with the plurality of anchor nodes is used for computing the at least one positioning assistance measurement;
determine a positioning report comprising the at least one positioning assistance measurement of the target node;
compute one or more of each of time difference measurements, round-trip-time measurements, carrier phase measurements for positioning, angle of arrival measurements, angle of departure measurements and reference signal received power measurements related to propagation of signals between the target node and at least one anchor node,
wherein the positioning report comprises the one or more of each of time difference measurements, round-trip-time, carrier phase measurements for positioning, angle of arrival measurements, angle of departure measurements and reference signal received power measurements, and
wherein the one or more of each of time difference measurements comprise a time of arrival measurement, a time difference of arrival measurement, round trip time and a reference signal time difference measurement;
dispatch the positioning report to at least one of the plurality of anchor nodes;
receive, from at least one of the plurality of anchor nodes, at least one second positioning report comprising the at least one positioning assistance measurement and the one or more of each of time difference measurements, round-trip-time measurements, carrier phase measurements for positioning, angle of arrival measurements, angle of departure measurements and reference signal received power measurements of the anchor node; and
reconstruct a geometry of a network comprising the network node, the target node and at least one anchor node based on the positioning reports of the target node and the at least one anchor node to determine position of the target node and one of the plurality of anchor nodes.