Apparatus for selecting radio beams
An access node, method and computer program product for: receiving from a terminal device served by a first access node measurement data relating to a plurality of radio beams, determining that the measurement data comprises data relating to at least one radio beam provided by at least one second access node, receiving information relating to angular coverage of the at least one radio beam provided by at least the second access node, determining, based on the angular coverage and the measurement data relating to the plurality of radio beams, an estimated location of the terminal device, and selecting a set of radio beams for provision to the estimated location of the terminal device, wherein the set of radio beams comprises a subset of radio beams provided by the first access node for serving the terminal device.
1. A terminal device comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to with the at least one processor, cause the terminal device at least to:
measure signals relating to a plurality of radio beams;
determine, based on the measured signals, at least one metric relating to radio beam quality and at least one metric relating to radio beam positioning of radio beams, wherein the at least one metric relating to radio beam quality includes radio beam power and the at least one metric relating to radio beam positioning includes propagation delay, wherein radio beam power includes received signal power such as a received signal strength indicator (RSSI) or a reference signal received power (RSRP), and propagation delay includes a timing advance or time of arrival;
transmit a set of data relating to the plurality of radio beams to at least one access node, wherein the set of data includes the at least one metric relating to radio beam quality and the at least one metric relating to radio beam positioning of radio beams;
estimate a direction of an arrival path of radio beams provided by the at least one access node, wherein estimating the direction of the arrival path includes switching receive beams until captured energy is the highest, and estimating a complex gain of one or more multipath components; and
select a subset of radio beams provided by the at least one access node, wherein selecting the subset of radio beams includes collecting signal energy from a specified transmitter, wherein the terminal device is served by a first access node, wherein the measurement data comprises a synchronization signal block (SSB) associated with a radio beam provided by at least one second access node, wherein the SSB comprises at least a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and wherein the PSS and SSS are used for radio frame synchronization.