Reconfigurable intelligent surface (RIS)-enabled full-duplex user equipment self-localization
In an aspect, a user equipment (UE) may obtain an indication of one or more reconfigurable intelligent surfaces (RIS) for use during a self-localization positioning session. The UE may receive a reference signal (RS) configuration for transmitting one or more RS for the self-localization positioning session. The UE may receive a reflection schedule for at least one RIS of the one or more RIS, wherein the reflection schedule indicates one or more reflection phases of the at least one RIS for reflecting the one or more RS transmitted by the UE and corresponding times at which each reflection phase of the one or more reflection phases is activated at the at least one RIS.
1. A method of wireless communication performed by a user equipment (UE), comprising:
obtaining an indication of one or more reconfigurable intelligent surfaces (RIS) for use during a self-localization positioning session;
receiving a reference signal (RS) configuration for transmitting one or more RS for the self-localization positioning session; and
receiving a reflection schedule for at least one RIS of the one or more RIS, wherein the reflection schedule indicates one or more reflection phases of the at least one RIS for reflecting the one or more RS transmitted by the UE and corresponding times at which each reflection phase of the one or more reflection phases is activated at the at least one RIS.
2. The method of claim 1 , wherein:
the one or more RS are one or more sounding reference signals (SRS).
3. The method of claim 1 , wherein:
the indication of the one or more RIS for use during the self-localization positioning session is obtained from a network server.
4. The method of claim 3 , further comprising:
discovering, by the UE, a set of one or more RIS in a positioning environment of the UE; and
reporting, to the network server, an indication of the set of one or more RIS discovered by the UE, wherein the one or more RIS indicated for the self-localization positioning session obtained from the network server is based, at least in part, on the set of one or more RIS reported by the UE.
5. The method of claim 1 , further comprising:
obtaining RIS information indicating
a position of each of the one or more RIS indicated for use during the self-localization positioning session,
an orientation of each of the one or more RIS indicated for use during the self-localization positioning session, or
a combination thereof.
6. The method of claim 5 , wherein:
the RIS information is obtained from
assistance data received from a network server during the self-localization positioning session,
one or more positioning system information blocks (posSIBs) received by the UE, or
a combination thereof.
7. The method of claim 1 , wherein the RS configuration indicates:
a number T of RS transmissions to be transmitted for the self-localization positioning session;
a bandwidth for the RS transmissions to be transmitted for the self-localization positioning session;
frequency domain resource allocations (FDRA) for the RS transmissions to be transmitted for the self-localization positioning session;
time domain resource allocations (TDRA) for the RS transmissions to be transmitted for the self-localization positioning session; or
any combination thereof.
8. The method of claim 1 , wherein:
the one or more reflection phases of the at least one RIS are based on a plurality of random reflection phases for reflecting the RS transmitted by the UE toward random points with respect to the at least one RIS.
9. The method of claim 1 , wherein:
the one or more reflection phases of the at least one RIS are based on a plurality of reflection phases for reflecting RS signals transmitted by the UE toward a fixed set of angles with respect to a location and orientation of the at least one RIS.
10. The method of claim 9 , wherein:
the fixed set of angles corresponds to equal angle steps over a defined number of transmissions of the RS by the UE during the self-localization positioning session.
11. The method of claim 10 , wherein:
the fixed set of angles cover a range of reflection angles between a maximum negative angle −θ max to a maximum positive angle −θ min with respect to a boresight of the at least one RIS.
12. The method of claim 1 , wherein:
the one or more reflection phases of the at least one RIS is based on a plurality of reflection phases for reflecting RS signals transmitted by the UE toward multiple points defined within a sphere centered at an estimated location of the UE.
13. The method of claim 12 , wherein the estimated location of the UE is determined based on:
a global positioning satellite (GPS) positioning operation;
a position of the UE obtained during a New Radio (NR) positioning session;
an enhanced-cell identity positioning operation; or
any combination thereof.
14. The method of claim 12 , wherein:
the multiple points are based on an uncertainty associated with the estimated location of the UE.
15. The method of claim 1 , wherein obtaining an indication of the one or more RIS for use during the self-localization positioning session comprises:
obtaining an indication of a plurality of RIS for use during the self-localization positioning session; and
receiving at least one reflection schedule for each of the plurality of RIS, wherein the at least one RIS reflection schedule for each of the plurality of RIS indicates one or more reflection phases for reflecting RS transmitted by the UE and a schedule indicating when each reflection phase of the one or more reflection phases are activated for the self-localization positioning session.
16. The method of claim 15 , wherein:
the at least one RIS reflection schedule for each of the plurality of RIS is based on
phase configurations for reflecting RS transmitted by the UE that differ with respect to phase configurations for other RIS of the plurality of RIS,
schedules for activating the phase configurations that differ with respect to schedules for activating the phase configurations for other RIS of the plurality of RIS, or
any combination thereof.
17. The method of claim 15 , wherein:
the at least one reflection schedule for each of the plurality of RIS is based on
phase configurations for reflecting RS transmitted by the UE that are also used by one or more other RIS of the plurality of RIS,
schedules for activating the phase configurations that are also used by the one or more other RIS of the plurality of RIS, or
any combination thereof.
18. The method of claim 15 , wherein:
the plurality of RIS includes one or more sub-panels of at least one RIS panel of at least one RIS of the plurality of RIS, wherein the one or more sub-panels have different reflection schedules.
19. The method of claim 1 , wherein:
the RS configuration indicates a number T of RS transmissions to be transmitted by the UE for the self-localization positioning session;
the one or more reflection phases of the at least one RIS is based on a phase reversal profile; and
the reflection schedule for the at least one RIS indicates phases for T/2 RS transmissions.
20. A user equipment (UE), comprising:
a memory;
at least one transceiver; and
at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
obtain an indication of one or more reconfigurable intelligent surfaces (RIS) for use during a self-localization positioning session;
receive, via the at least one transceiver, a reference signal (RS) configuration for transmitting one or more RS for the self-localization positioning session; and
receive, via the at least one transceiver, a reflection schedule for at least one RIS of the one or more RIS, wherein the reflection schedule indicates one or more reflection phases of the at least one RIS for reflecting the one or more RS transmitted by the UE and corresponding times at which each reflection phase of the one or more reflection phases is activated at the at least one RIS.
21. The UE of claim 20 , wherein:
the one or more RS are one or more sounding reference signals (SRS).
22. The UE of claim 20 , wherein:
the indication of the one or more RIS for use during the self-localization positioning session is obtained from a network server.
23. The UE of claim 22 , wherein the at least one processor is further configured to:
discover a set of one or more RIS in a positioning environment of the UE; and
report, via the at least one transceiver, to the network server, an indication of the set of one or more RIS discovered by the UE, wherein the one or more RIS indicated for the self-localization positioning session obtained from the network server is based, at least in part, on the set of one or more RIS reported by the UE.
24. The UE of claim 20 , wherein the at least one processor is further configured to:
obtain RIS information indicating
a position of each of the one or more RIS indicated for use during the self-localization positioning session,
an orientation of each of the one or more RIS indicated for use during the self-localization positioning session, or
a combination thereof.
25. The UE of claim 24 , wherein:
the RIS information is obtained from
assistance data received from a network server during the self-localization positioning session,
one or more positioning system information blocks (posSIBs) received by the UE, or
a combination thereof.
26. The UE of claim 20 , wherein the RS configuration indicates:
a number T of RS transmissions to be transmitted for the self-localization positioning session;
a bandwidth for the RS transmissions to be transmitted for the self-localization positioning session;
frequency domain resource allocations (FDRA) for the RS transmissions to be transmitted for the self-localization positioning session;
time domain resource allocations (TDRA) for the RS transmissions to be transmitted for the self-localization positioning session; or
any combination thereof.
27. The UE of claim 20 , wherein:
the one or more reflection phases of the at least one RIS are based on a plurality of random reflection phases for reflecting the RS transmitted by the UE toward random points with respect to the at least one RIS.
28. The UE of claim 20 , wherein:
the one or more reflection phases of the at least one RIS are based on a plurality of reflection phases for reflecting RS signals transmitted by the UE toward a fixed set of angles with respect to a location and orientation of the at least one RIS.
29. The UE of claim 20 , wherein:
the one or more reflection phases of the at least one RIS is based on a plurality of reflection phases for reflecting RS signals transmitted by the UE toward multiple points defined within a sphere centered at an estimated location of the UE.
30. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a user equipment (UE), cause the UE to:
obtain an indication of one or more reconfigurable intelligent surfaces (RIS) for use during a self-localization positioning session;
receive a reference signal (RS) configuration for transmitting one or more RS for the self-localization positioning session; and
receive a reflection schedule for at least one RIS of the one or more RIS, wherein the reflection schedule indicates one or more reflection phases of the at least one RIS for reflecting the one or more RS transmitted by the UE and corresponding times at which each reflection phase of the one or more reflection phases is activated at the at least one RIS.